/*!
 * Apple-inspired Minimalist UI for Sight-Reading Generator
 * IC Studio 视奏工具 - 专业级视奏旋律生成器
 * 
 * Copyright © 2026. All rights reserved. Igor Chen - icstudio.club
 * 
 * Author: Igor Chen
 * Website: https://icstudio.club
 * Email: icstudio@fastmail.com
 */
:root {
    /* Apple-style color palette - Light Mode */
    --primary-blue: #007AFF;
    --secondary-blue: #5AC8FA;
    --neutral-white: #FFFFFF;
    --neutral-light: #F2F2F7;
    --neutral-medium: #C7C7CC;
    --neutral-dark: #8E8E93;
    --neutral-black: #1D1D1F;
    --accent-green: #34C759;
    --accent-orange: #FF9500;
    --accent-purple: #AF52DE;
    --background-blur: rgba(255, 255, 255, 0.8);
    --card-shadow: rgba(0, 0, 0, 0.04);
    --card-shadow-hover: rgba(0, 0, 0, 0.08);
    --card-shadow-focus: rgba(0, 122, 255, 0.15);
    --border-color: rgba(0, 0, 0, 0.06);
    --border-color-medium: rgba(0, 0, 0, 0.08);
    --body-bg: #f5f5f7;
    --info-bg: #f8f9fa;
    --info-border: #e9ecef;
    --secondary-text: #6c757d;
    --heading-text: #495057;
    
    /* Typography system */
    --font-system: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, Menlo, monospace;
}

/* Dark mode color palette - Apple-inspired blue-gray theme */
[data-theme="dark"] {
    --primary-blue: #0A84FF;
    --secondary-blue: #64D2FF;
    --neutral-white: #2C2C2E;      /* Cards/containers */
    --neutral-light: #3A3A3C;      /* Slightly lighter containers */
    --neutral-medium: #48484A;     /* Input fields, borders */
    --neutral-dark: #8E8E93;       /* Secondary text */
    --neutral-black: #F2F2F7;      /* Primary text */
    --accent-green: #32D74B;
    --accent-orange: #FF9F0A;
    --accent-purple: #BF5AF2;
    --background-blur: rgba(44, 44, 46, 0.8);
    --card-shadow: rgba(0, 0, 0, 0.4);
    --card-shadow-hover: rgba(0, 0, 0, 0.6);
    --card-shadow-focus: rgba(10, 132, 255, 0.3);
    --border-color: rgba(255, 255, 255, 0.15);
    --border-color-medium: rgba(255, 255, 255, 0.25);
    --body-bg: #1D1D1F;            /* Apple-style dark gray background */
    --info-bg: #3A3A3C;
    --info-border: rgba(255, 255, 255, 0.2);
    --secondary-text: #8E8E93;
    --heading-text: #F2F2F7;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Helvetica, Arial, 'Microsoft YaHei', sans-serif;
    background: var(--body-bg);
    background-image: 
        /* 音符装饰 - 圆形音符头 */
        radial-gradient(circle at 15% 20%, rgba(0, 0, 0, 0.06) 1px, transparent 1px),
        radial-gradient(circle at 85% 35%, rgba(0, 0, 0, 0.05) 1.5px, transparent 1.5px),
        radial-gradient(circle at 25% 70%, rgba(0, 0, 0, 0.06) 1px, transparent 1px),
        radial-gradient(circle at 75% 85%, rgba(0, 0, 0, 0.05) 1.5px, transparent 1.5px),
        radial-gradient(circle at 45% 15%, rgba(0, 0, 0, 0.06) 1px, transparent 1px),
        radial-gradient(circle at 65% 60%, rgba(0, 0, 0, 0.05) 1px, transparent 1px),
        /* 五线谱线条暗示 */
        linear-gradient(90deg, rgba(0, 0, 0, 0.025) 1px, transparent 1px),
        /* 骰子点装饰 */
        radial-gradient(circle at 10% 10%, rgba(0, 0, 0, 0.035) 2px, transparent 2px),
        radial-gradient(circle at 90% 20%, rgba(0, 0, 0, 0.035) 2px, transparent 2px),
        radial-gradient(circle at 20% 90%, rgba(0, 0, 0, 0.035) 2px, transparent 2px),
        radial-gradient(circle at 80% 80%, rgba(0, 0, 0, 0.035) 2px, transparent 2px),
        radial-gradient(circle at 50% 45%, rgba(0, 0, 0, 0.03) 1.5px, transparent 1.5px),
        /* 音乐符号形状暗示 */
        linear-gradient(45deg, rgba(0, 0, 0, 0.015) 0.5px, transparent 0.5px),
        linear-gradient(-45deg, rgba(0, 0, 0, 0.015) 0.5px, transparent 0.5px);
    background-size: 
        /* 音符大小 */
        200px 200px, 250px 250px, 180px 180px, 220px 220px, 160px 160px, 190px 190px,
        /* 五线谱 */
        100% 60px,
        /* 骰子点 */
        150px 150px, 180px 180px, 200px 200px, 160px 160px, 120px 120px,
        /* 音乐符号 */
        80px 80px, 80px 80px;
    background-position: 
        /* 音符位置 */
        0 0, 20px 30px, 40px 60px, 60px 90px, 80px 20px, 100px 50px,
        /* 五线谱位置 */
        0 0,
        /* 骰子点位置 */
        0 0, 30px 40px, 50px 70px, 70px 10px, 90px 80px,
        /* 音乐符号位置 */
        10px 10px, 10px 10px;
    background-repeat: repeat;
    min-height: 100vh;
    padding: 20px;
    line-height: 1.47059;
    font-weight: 400;
    letter-spacing: -0.022em;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: #ffffff;
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-radius: 18px;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px var(--card-shadow);
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    z-index: 1;
    border-top: 8px solid #007bff58/* base accent line */
}



/* Header - Apple style */
.header {
    background: #007bff05;
    color: #1d1d1f;
    padding: 40px 30px;
    text-align: center;
    border-bottom: 1px solid #d2d2d7;
}


.header h1 {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Helvetica, Arial, 'Microsoft YaHei', sans-serif;
    font-size: 3.5rem;
    margin-bottom: 10px;
    font-weight: 400;
    letter-spacing: -0.03em;
    line-height: 1.1;
    color: #1d1d1f;
}

.header p {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Helvetica Neue', Helvetica, Arial, 'Microsoft YaHei', sans-serif;
    color: #86868b;
    font-size: 1.2rem;
    font-weight: 400;
    letter-spacing: -0.022em;
    line-height: 1.381;
}

/* Controls section with Apple card styling */
.controls {
    padding: 30px;
    background: #fbfbfd;
    border-bottom: 1px solid #d2d2d7;
}

.control-row {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    margin-bottom: 24px;
    align-items: flex-start;
    background: #fbfbfd;
}

.control-row:last-of-type {
    justify-content: center;
    margin-bottom: 0;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex: 1;
    min-width: 160px;
}

.control-group label {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Helvetica, Arial, 'Microsoft YaHei', sans-serif;
    font-weight: 400;
    color: #1d1d1f;
    font-size: 1rem;
    letter-spacing: 0.01em;
}

.controls #rangeMin,
.controls #rangeMax {
    margin-top: 32px;
}

.control-row.inline-control-row {
    gap: 24px;
    align-items: flex-end;
}

.control-row.inline-control-row .control-group {
    flex: 0 0 auto;
    min-width: 0;
    gap: 12px;
}

.control-row.inline-control-row .range-control-group {
    width: 120px;
}

.control-row.inline-control-row .range-control-group select {
    width: 100%;
}

.control-row.inline-control-row .metronome-group {
    width: 156px !important;
    margin-left: 0 !important;
}

.control-row.inline-control-row .metronome-control {
    width: 100%;
    justify-content: space-between;
}

.melody-secondary-row {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 24px;
    align-items: start;
}

.melody-primary-row {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
    align-items: stretch;
}

.melody-primary-row .control-group {
    min-width: 0;
}

.melody-secondary-row-four {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.melody-secondary-row-three {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.melody-secondary-cell {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.melody-primary-row .btn-secondary,
.melody-secondary-row .btn-secondary {
    width: 100%;
    min-width: 0 !important;
    min-height: 52px;
    height: 52px;
    padding: 0 8px !important;
    flex: 0 0 auto !important;
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: -0.01em;
    line-height: 1;
    color: #1d1d1f;
    background: #f2f2f7;
    border: 1px solid var(--border-color) !important;
    box-shadow: 0 2px 8px var(--card-shadow);
    transition: all 0.2s ease;
}

.melody-primary-row .btn-secondary:hover,
.melody-secondary-row .btn-secondary:hover {
    background: var(--neutral-light);
    border-color: var(--border-color-medium);
    color: #1d1d1f;
    transform: translateY(-1px) scale(1.05);
    box-shadow: 0 4px 16px var(--card-shadow-hover);
}

.melody-primary-row .btn-secondary:active,
.melody-secondary-row .btn-secondary:active {
    background: var(--neutral-light);
    color: #1d1d1f;
    transform: translateY(0) scale(0.98);
    box-shadow: 0 2px 8px var(--card-shadow);
}

.melody-secondary-row #rangeMin,
.melody-secondary-row #rangeMax {
    margin-top: 0;
    width: 100%;
    min-height: 52px;
    box-shadow: 0 2px 8px var(--card-shadow);
}

.melody-secondary-row #rangeMin:hover,
.melody-secondary-row #rangeMax:hover {
    box-shadow: 0 4px 16px var(--card-shadow-hover);
}

.melody-range-pair {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

.melody-range-pair select {
    width: 100%;
}

.melody-secondary-card {
    min-height: 52px;
    padding: 10px 14px;
    border: 1px solid var(--border-color-soft);
    border-radius: 14px;
    background: #ffffff;
    box-shadow:
        0 2px 8px var(--card-shadow),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.melody-secondary-label {
    font-size: 15px;
    font-weight: 500;
    color: #1d1d1f;
    line-height: 1.2;
}

.melody-accidental-card .melody-secondary-label {
    flex: 0 0 auto;
    white-space: nowrap;
}

.melody-accidental-card {
    display: flex;
    align-items: center;
    gap: 12px;
    height: 53px;
    box-sizing: border-box;
    padding: 0 14px;
}

.melody-accidental-row {
    display: flex;
    align-items: center;
    flex: 1 1 auto;
    min-width: 0;
    gap: 8px;
}

.melody-accidental-row input[type="range"] {
    flex: 1 1 0%;
    min-width: 0;
    height: 4px;
}

.melody-accidental-row span {
    min-width: 30px;
    text-align: right;
    font-weight: 600;
    font-size: 14px;
    line-height: 1;
}

.control-toggle-input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.melody-display-pair {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    width: 100%;
}

.melody-toggle-stack {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
    width: 100%;
}

.melody-secondary-row .control-toggle-btn {
    width: 100% !important;
    min-width: 0 !important;
    height: 52px !important;
    padding: 0 8px !important;
    flex: 0 0 auto !important;
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: -0.01em;
    line-height: 1;
}

.control-toggle-btn .control-toggle-btn-text {
    font-size: inherit;
    font-weight: inherit;
    letter-spacing: inherit;
    line-height: 1;
    font-family: inherit;
}

.melody-visibility-btn.control-toggle-btn.is-active {
    background: var(--primary-blue) !important;
    color: #ffffff !important;
    border-color: var(--primary-blue) !important;
}

.melody-visibility-btn.control-toggle-btn.is-active:hover {
    background: #005FCC !important;
    border-color: #005FCC !important;
}

.melody-mode-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
}

.melody-metronome-card .metronome-control {
    width: 100%;
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    align-items: stretch;
    gap: 10px;
}

.melody-metronome-card .bpm-input-control {
    width: 100%;
    min-width: 0;
    height: 38px;
    padding: 0 10px;
    border-radius: 10px;
    font-size: 18px;
    line-height: 38px;
    text-align: center;
    box-sizing: border-box;
}

.melody-metronome-card .metronome-settings-btn {
    width: 100%;
    height: 38px;
    padding: 0;
    border-radius: 10px;
}

.melody-metronome-card .metronome-settings-btn .ui-icon {
    width: 18px;
    height: 18px;
}

.toolbar-metronome-card {
    min-height: 54px;
    padding: 8px 12px;
    width: 164px;
    box-sizing: border-box;
}

.buttons .toolbar-metronome-card {
    flex: 0 0 auto;
}

@media (max-width: 1200px) {
    .melody-primary-row {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .melody-secondary-row {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}

@media (max-width: 820px) {
    .melody-secondary-row {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (min-width: 769px) and (max-width: 900px) {
    .header h1 {
        font-size: 2.25rem;
        letter-spacing: 0;
    }
}

@media (max-width: 560px) {
    .melody-secondary-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .buttons .toolbar-metronome-card {
        width: 100%;
        max-width: 360px;
    }
}

/* Apple-style form controls */
select, input {
    font-family: var(--font-system);
    padding: 14px 18px;
    border: 1px solid var(--border-color-soft);
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 400;
    color: #1d1d1f;
    background: #ffffff !important;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
}

select:focus, input:focus {
    outline: none;
    border-color: #007aff;
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.15);
    background: #ffffff !important;
    transform: translateY(-1px);
}

select:hover, input:hover {
    border-color: var(--border-color-medium);
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.08);
    background: #ffffff !important;
    transform: translateY(-1px);
}

select:active, select:focus:active {
    background: #ffffff !important;
    border-color: #007aff;
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.15);
}

select option {
    background: #ffffff !important;
    color: #1d1d1f !important;
}

/* Apple-style range slider */
input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: #d2d2d7;
    border-radius: 2px;
    padding: 0;
    border: none;
    transition: all 0.3s ease;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: #ffffff;
    border: 4px solid #007aff;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: 
        0 2px 8px rgba(0, 0, 0, 0.08),
        0 4px 16px rgba(0, 122, 255, 0.12);
}

input[type="range"]::-webkit-slider-thumb:hover {
    border-color: #0056cc;
    transform: scale(1.1);
    box-shadow: 0 4px 16px rgba(0, 122, 255, 0.3);
}

input[type="range"]::-webkit-slider-thumb:active {
    transform: scale(0.95);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: #ffffff;
    border: 2px solid #007aff;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

/* Main page metronome toggle button */
.metronome-toggle-btn {
    width: 32px;
    height: 32px;
    padding: 0;
    background: var(--primary-blue);
    border: none;
    border-radius: 50%;
    color: #FFFFFF;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
}

.metronome-toggle-btn:hover {
    background: #005FCC;
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0, 122, 255, 0.4);
}

.metronome-toggle-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
}

.metronome-toggle-btn.active {
    background: var(--accent-orange);
    animation: metronome-pulse 0.5s ease-in-out infinite alternate;
}

.metronome-toggle-btn.active:hover {
    background: #E6850E;
}

@keyframes metronome-pulse {
    from {
        box-shadow: 0 2px 8px rgba(255, 149, 10, 0.3);
    }
    to {
        box-shadow: 0 4px 16px rgba(255, 149, 10, 0.6);
    }
}

/* Dark mode metronome button */
[data-theme="dark"] .metronome-toggle-btn {
    background: var(--primary-blue) !important;
    color: #FFFFFF !important;
}

[data-theme="dark"] .metronome-toggle-btn:hover {
    background: #1E8FFF !important;
}

[data-theme="dark"] .metronome-toggle-btn.active {
    background: var(--accent-orange) !important;
}

/* BPM input styling */
.bpm-input {
    width: 65px;
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    text-align: center;
    background: var(--neutral-white);
    color: var(--neutral-black);
    transition: all 0.2s ease;
    cursor: pointer;
}

.bpm-input:hover {
    border-color: var(--border-color-medium);
    background: var(--neutral-light);
}

.bpm-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 2px rgba(0, 122, 255, 0.2);
    background: var(--neutral-white);
    cursor: text;
}

/* Dark mode BMP input */
[data-theme="dark"] .bpm-input {
    background: var(--neutral-light) !important;
    color: var(--neutral-black) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .bpm-input:hover {
    background: var(--neutral-medium) !important;
    border-color: var(--border-color-medium) !important;
}

[data-theme="dark"] .bpm-input:focus {
    background: var(--neutral-light) !important;
    border-color: var(--primary-blue) !important;
}

/* Main page metronome control styling */
.metronome-control {
    display: flex;
    align-items: center;
    gap: 8px;
}

.metronome-label-row {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 6px;
}

.metronome-label-row label {
    margin-bottom: 0;
}

/* Reduce spacing specifically for metronome group */
.metronome-group {
    margin-left: -16px !important;
}

.bpm-input-control {
    width: 85px;
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    text-align: center;
    background: #ffffff !important;
    color: #1d1d1f;
    transition: all 0.2s ease;
    cursor: pointer;
    font-family: var(--font-system);
}

.bpm-input-control:focus {
    outline: none;
    border-color: #007aff;
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.15);
    background: #ffffff !important;
    transform: translateY(-1px);
}

.bpm-input-control:hover {
    border-color: var(--border-color-medium);
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.08);
    background: #ffffff !important;
    transform: translateY(-1px);
}

/* Dark mode BPM input control */
[data-theme="dark"] .bpm-input-control {
    background: var(--neutral-light) !important;
    color: var(--neutral-black) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .bpm-input-control:hover {
    background: var(--neutral-medium) !important;
    border-color: var(--border-color-medium) !important;
}

[data-theme="dark"] .bpm-input-control:focus {
    background: var(--neutral-light) !important;
    border-color: var(--primary-blue) !important;
}

/* BPM拖动状态样式 */
.bpm-input-control.dragging {
    background: var(--neutral-light) !important;
    border-color: var(--primary-blue) !important;
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.15);
    cursor: ns-resize !important;
    transform: translateY(-1px);
}

[data-theme="dark"] .bpm-input-control.dragging {
    background: var(--neutral-medium) !important;
    border-color: var(--primary-blue) !important;
    box-shadow: 0 0 0 3px var(--card-shadow-focus);
    cursor: ns-resize !important;
    transform: translateY(-1px);
}

/* Header Compact Metronome Styles */
.header-metronome {
    display: flex;
    align-items: center;
}

.metronome-compact {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--neutral-white);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 8px 12px;
    box-shadow: 0 2px 8px var(--card-shadow);
    transition: all 0.2s ease;
}

.metronome-compact:hover {
    box-shadow: 0 4px 16px var(--card-shadow-hover);
    transform: translateY(-1px);
}

.metronome-bpm {
    display: flex;
    align-items: center;
    gap: 4px;
}

.bpm-display {
    width: 45px;
    padding: 2px 6px;
    border: none;
    background: transparent;
    font-size: 14px;
    font-weight: 600;
    text-align: center;
    color: var(--neutral-black);
    outline: none;
}

.bpm-display:focus {
    background: var(--neutral-light);
    border-radius: 4px;
}

.bpm-label {
    font-size: 11px;
    font-weight: 500;
    color: var(--neutral-dark);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metronome-play-btn {
    width: 50px;
    height: 50px;
    padding: 12px;
    background: #f2f2f7;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    color: #1d1d1f;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px var(--card-shadow);
}

.metronome-play-btn:hover {
    background: var(--neutral-light);
    border-color: var(--border-color-medium);
    transform: translateY(-1px) scale(1.05);
    box-shadow: 0 4px 16px var(--card-shadow-hover);
}

.metronome-play-btn:active {
    transform: translateY(0) scale(0.98);
    box-shadow: 0 2px 8px var(--card-shadow);
}

.metronome-play-btn.active {
    background: var(--primary-blue) !important;
    color: #FFFFFF !important;
    border-color: var(--primary-blue) !important;
    animation: none;
}

.metronome-play-btn.active:hover {
    background: #005FCC !important;
    border-color: #005FCC !important;
}

.metronome-settings-btn {
    width: 28px;
    height: 28px;
    padding: 0;
    background: var(--neutral-white);
    border: 1px solid var(--border-color);
    border-radius: 9px;
    color: var(--neutral-black);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.metronome-settings-btn:hover {
    border-color: var(--border-color-medium);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
    transform: translateY(-1px);
}

.metronome-settings-btn:active {
    transform: translateY(0);
}

.metronome-beat-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--neutral-medium);
    transition: all 0.1s ease;
    opacity: 0.6;
}

.metronome-beat-indicator.beat {
    background: var(--accent-green);
    transform: scale(1.5);
    opacity: 1;
    box-shadow: 0 0 6px var(--accent-green);
}

@keyframes header-metronome-pulse {
    from {
        box-shadow: 0 0 0 0 rgba(255, 149, 10, 0.4);
    }
    to {
        box-shadow: 0 0 0 4px rgba(255, 149, 10, 0.1);
    }
}

/* Dark mode styles for header metronome */
[data-theme="dark"] .metronome-compact {
    background: var(--neutral-white) !important;
    border-color: var(--border-color) !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .metronome-compact:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.6);
}

[data-theme="dark"] .bpm-display {
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .bpm-display:focus {
    background: var(--neutral-light) !important;
}

[data-theme="dark"] .bpm-label {
    color: var(--neutral-dark) !important;
}

[data-theme="dark"] .metronome-play-btn {
    background: var(--neutral-light) !important;
    border-color: var(--border-color) !important;
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .metronome-play-btn:hover {
    background: var(--neutral-medium) !important;
    border-color: var(--border-color-medium) !important;
}

[data-theme="dark"] .metronome-play-btn.active {
    background: var(--primary-blue) !important;
    color: #FFFFFF !important;
    border-color: var(--primary-blue) !important;
}

[data-theme="dark"] .metronome-settings-btn {
    background: var(--neutral-light) !important;
    border-color: var(--border-color) !important;
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .metronome-settings-btn:hover {
    background: var(--neutral-medium) !important;
    border-color: var(--border-color-medium) !important;
}

[data-theme="dark"] .metronome-beat-indicator {
    background: var(--neutral-medium) !important;
}

[data-theme="dark"] .metronome-beat-indicator.beat {
    background: var(--accent-green) !important;
}

.metronome-pattern-row {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: flex-end;
    margin-bottom: 16px;
}

.metronome-pattern-toggle-group {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 12px;
}

.metronome-pattern-toggle-group .toggle-container {
    flex-shrink: 0;
}

/* Match interval tool: use native checkbox for metronome pattern toggle */
.metronome-pattern-toggle-group .toggle-container {
    width: auto;
    height: auto;
    display: inline-block;
}

.metronome-pattern-toggle-group .toggle-input {
    opacity: 1;
    width: auto;
    height: auto;
    position: static;
}

.metronome-pattern-toggle-group .toggle-slider {
    display: none;
    position: static;
    width: auto;
    height: auto;
    background: transparent;
    box-shadow: none;
    border-radius: 0;
}

.metronome-pattern-toggle-group .toggle-button {
    display: none;
}

.metronome-pattern-select {
    width: 100%;
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--neutral-white);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-color);
}

.metronome-pattern-info {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    background: var(--neutral-light);
    border-radius: 8px;
    font-size: 13px;
    color: var(--neutral-dark);
}

.metronome-pattern-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(32px, 1fr));
    gap: 8px;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: var(--neutral-white);
    margin-bottom: 8px;
}

.metronome-pattern-grid.disabled {
    opacity: 0.45;
    pointer-events: none;
}

.metronome-pattern-step {
    height: 34px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--neutral-light);
    color: var(--neutral-dark);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.metronome-pattern-step.beat-start {
    border-color: var(--primary-blue);
    color: #FFFFFF;
}

.metronome-pattern-step.active {
    background: #007aff;
    color: #ffffff;
    border-color: #007aff;
    box-shadow: 0 3px 6px rgba(0, 122, 255, 0.3);
}

.metronome-pattern-step.active.beat-start {
    background: #007aff;
    border-color: #007aff;
    box-shadow: 0 3px 6px rgba(0, 122, 255, 0.3);
}

.metronome-pattern-step.bar-start {
    box-shadow: inset 0 0 0 2px rgba(0, 122, 255, 0.35);
}

.metronome-pattern-step.active.bar-start {
    box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.35), 0 6px 16px rgba(0, 71, 163, 0.45);
}

[data-theme="dark"] .metronome-pattern-select {
    background: var(--neutral-light) !important;
    border-color: var(--border-color) !important;
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .metronome-pattern-info {
    background: var(--neutral-medium) !important;
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .metronome-pattern-grid {
    background: var(--neutral-white) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .metronome-pattern-step {
    background: var(--neutral-light) !important;
    border-color: var(--border-color) !important;
    color: var(--neutral-black) !important;
}

/* Original spacing restored */

/* Radio button styling */
.radio-group {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.radio-item {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 8px;
    transition: background-color 0.3s ease;
}

.radio-item:hover {
    background-color: #f2f2f7;
}

.radio-item input[type="radio"] {
    cursor: pointer;
    width: 18px;
    height: 18px;
    accent-color: #007aff;
    cursor: pointer;
}

.radio-item label {
    font-size: 1rem;
    font-weight: 500;
    color: var(--neutral-text-secondary);
    cursor: pointer;
    text-transform: none;
    font-variant: normal;
    letter-spacing: -0.01em;
}

/* Apple-style buttons */
.buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
}

.toolbar-main-actions,
.toolbar-utility-group {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
}

.toolbar-metronome-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.button-group {
    display: flex;
    gap: 16px;
    align-items: center;
}

#challengeCountdownUI {
    margin-right: 0 !important;
}

.toolbar-main-actions .btn-secondary,
.buttons > .button-group > .btn-secondary {
    min-width: 0;
    height: 52px;
    min-width: 96px;
    padding: 0 24px !important;
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: -0.01em;
    line-height: 1;
    color: #1d1d1f;
    background: #f2f2f7;
    border: 1px solid var(--border-color) !important;
    box-shadow: 0 2px 8px var(--card-shadow);
    transition: all 0.2s ease;
}

.toolbar-main-actions .btn-secondary:hover,
.buttons > .button-group > .btn-secondary:hover {
    background: var(--neutral-light);
    border-color: var(--border-color-medium);
    color: #1d1d1f;
    transform: translateY(-1px) scale(1.05);
    box-shadow: 0 4px 16px var(--card-shadow-hover);
}

.toolbar-main-actions .btn-secondary:active,
.buttons > .button-group > .btn-secondary:active {
    background: var(--neutral-light);
    color: #1d1d1f;
    transform: translateY(0) scale(0.98);
    box-shadow: 0 2px 8px var(--card-shadow);
}

/* Melody Visibility Button */
.melody-visibility-btn {
    width: 44px;
    height: 44px;
    padding: 0;
    background: #f2f2f7;
    border: 1px solid var(--border-color);
    border-radius: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px var(--card-shadow);
}

.melody-visibility-btn:hover {
    background: var(--neutral-light);
    border-color: var(--border-color-medium);
    transform: translateY(-1px) scale(1.05);
    box-shadow: 0 4px 16px var(--card-shadow-hover);
}

.melody-visibility-btn:active {
    transform: translateY(0) scale(0.98);
    box-shadow: 0 2px 8px var(--card-shadow);
}

.melody-visibility-btn.hidden-state {
    background: var(--primary-blue);
    color: #FFFFFF;
    border-color: var(--primary-blue);
}

.melody-visibility-btn.hidden-state:hover {
    background: #005FCC;
    border-color: #005FCC;
}

button {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Helvetica, Arial, 'Microsoft YaHei', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    border: none;
    border-radius: 14px;
    cursor: pointer !important;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    letter-spacing: -0.01em;
    position: relative !important;
    overflow: visible;
    pointer-events: auto !important;
    z-index: 100 !important;
}

.btn-primary {
    padding: 14px 28px;
    background: #007aff;
    color: white;
    border-color: #007aff;
    box-shadow:  0 3px 6px rgba(0, 122, 255, 0.3);
    font-size: 1.1rem;
    font-weight: 600;
}

.btn-primary:hover {
    background: #005FCC;
    border-color: #0056cc;
    transform: translateY(-2px);
    box-shadow: 
        0 8px 24px rgba(0, 122, 255, 0.35),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn-primary:active {
    transform: translateY(-1px);
    box-shadow: 
        0 4px 16px rgba(0, 122, 255, 0.25),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-secondary {
    padding: 14px 28px;
    background: #f2f2f7;
    color: #1d1d1f;
    border-color: #d2d2d7;
    border: 1px solid var(--border-color-soft);
    box-shadow:
        0 2px 8px rgba(0, 0, 0, 0.04),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
    font-weight: 500;
}

.btn-secondary:hover {
    background: #e8e8ed;
    border-color: #b8b8bf;
    transform: translateY(-2px);
    box-shadow: 
        0 4px 16px rgba(0, 0, 0, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
    border-color: #b8b8bf;
    color: #1d1d1f;
}

.btn-secondary:active {
    transform: translateY(-1px);
    background: #e8e8ed;
    color: #1d1d1f;
    box-shadow: 
        0 2px 8px rgba(0, 0, 0, 0.12),
        inset 0 1px 0 rgba(0, 0, 0, 0.05);
}

.btn-select-all {
    background: #f2f2f7 !important;
    border: 1px solid #d2d2d7 !important;
    padding: 10px 18px !important;
    font-size: 0.95rem !important;
    font-weight: 600 !important;
    border: none !important;
    color: #1d1d1f !important;
    border-radius: 10px !important;
    transition: all 0.3s ease !important;
}

.btn-select-all:hover {
    background: #e8e8ed !important;
    border-color: #b8b8bf !important;
    transform: translateY(-1px) !important;
}

/* Score container with Apple-style card - MUSIC CLARITY OPTIMIZED */
.score-container {
    padding: 50px 40px;
    background: #007bff05;
    min-height: 550px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    position: relative;
}

/* Force score container to always be light for music sheet visibility */
[data-theme="dark"] .score-container {
    background: #007bff05;
}

[data-theme="dark"] #score {
    background: #FFFFFF !important;
    color: #000000 !important;
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .empty-score-message {
    color: #6B6B6B !important;
}

.score-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--accent-purple));
    border-radius: 2px;
    opacity: 0.25;
}

#score {
    width: 100%;
    max-width: 1200px;
    background: #FFFFFF; /* 纯白背景确保乐谱清晰 */
    border-radius: 16px;
    border: 1px solid var(--border-color);
    min-height: 420px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 
        0 2px 16px rgba(0, 0, 0, 0.04),
        0 8px 32px rgba(0, 0, 0, 0.02),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    overflow: visible;
    position: relative;
}

#score:hover {
    box-shadow: 
        0 4px 24px rgba(0, 0, 0, 0.06),
        0 12px 48px rgba(0, 0, 0, 0.04),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
    transform: translateY(-2px);
}

#score:focus-within {
    box-shadow: 
        0 4px 24px var(--card-shadow-focus),
        0 12px 48px rgba(0, 122, 255, 0.08),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

/* Apple-style modals - FIXED */
.modal {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    background: rgba(0, 0, 0, 0.5) !important;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: none;
    justify-content: center !important;
    align-items: center !important;
    z-index: 9999 !important;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: auto !important;
}

.modal.show {
    display: flex !important;
    opacity: 1 !important;
}

/* CRITICAL: Allow JavaScript to override display property */
.modal[style*="display: flex"],
.modal[style*="display:flex"],
.modal[style*="display: block"],
.modal[style*="display:block"] {
    display: flex !important;
    opacity: 1 !important;
    z-index: 9999 !important;
}

.modal-content {
    background: #ffffff !important;
    border-radius: 28px !important;
    max-width: 600px !important;
    width: 90% !important;
    max-height: 90vh !important;
    overflow: hidden !important;
    box-shadow:
        0 24px 72px rgba(15, 23, 42, 0.18),
        0 8px 24px rgba(0, 122, 255, 0.08) !important;
    border: none !important;
    transform: scale(1) !important;
    transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative !important;
    z-index: 10000 !important;
    pointer-events: auto !important;
}

.modal.show .modal-content {
    transform: scale(1) !important;
}

#measureModal .modal-content {
    border-radius: 28px !important;
    overflow: hidden !important;
    box-shadow:
        0 24px 72px rgba(15, 23, 42, 0.18),
        0 8px 24px rgba(0, 122, 255, 0.08) !important;
    border: none !important;
}

#measureModal .modal-header {
    padding: 30px 32px 24px !important;
    border-top: 14px solid #007bff83 !important;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    background: #ffffff !important;
}

#measureModal .modal-header::before {
    width: 54px;
    height: 3px;
    border-radius: 999px;
    opacity: 0.5;
}

#measureModal .modal-body {
    padding: 28px 32px 32px !important;
}

.modal-header {
    background: #ffffff !important;
    color: #1d1d1f;
    padding: 30px 32px 24px !important;
    border-bottom: 1px solid #d2d2d7;
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
    position: relative !important;
    z-index: 10001 !important;
    border-top: 14px solid #007bff83/* base accent line */
}

.modal-header::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-blue), var(--accent-purple));
    border-radius: 1px;
    opacity: 0.3;
}

.modal-header h3 {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Helvetica, Arial, 'Microsoft YaHei', sans-serif;
    margin: 0;
    font-size: 1.7rem;
    font-weight: 600;
    color: #1d1d1f;
    letter-spacing: -0.043em;
}

.close-modal, .close-btn {
    background: var(--neutral-soft) !important;
    border: none !important;
    border-radius: 8px !important;
    font-size: 1.2rem !important;
    cursor: pointer !important;
    color: var(--neutral-text-light) !important;
    width: 32px !important;
    height: 32px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    transition: all 0.3s ease !important;
    position: relative !important;
    z-index: 10002 !important;
    pointer-events: auto !important;
}

.close-modal:hover, .close-btn:hover {
    background: var(--neutral-soft) !important;
    color: var(--neutral-text) !important;
    transform: scale(1.1) !important;
}

.modal-body {
    padding: 28px 32px 32px !important;
    max-height: calc(90vh - 120px) !important;
    overflow-y: auto !important;
    position: relative !important;
    z-index: 10001 !important;
    pointer-events: auto !important;
}

#challengeModal .control-row {
    background: transparent;
    margin-top: 0;
    margin-bottom: 32px;
}

#challengeModal .control-group input[type="number"] {
    width: 100%;
}

#challengeModal .modal-content {
    width: 90%;
    max-width: 600px;
}

#challengeModal .modal-hint {
    font-size: 0.9rem;
    color: var(--secondary-text);
    margin: 0;
    line-height: 1.4;
}

/* Checkbox styling */
.rhythm-section {
    margin-bottom: 32px;
}

.rhythm-section h4 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #1d1d1f;
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 14px;
    cursor: pointer;
    padding: 14px 18px;
    border-radius: 10px;
    transition: all 0.3s ease;
    background: #ffffff
}

.checkbox-item:hover {
    background: #f2f2f7;
    border-color: var(--neutral-medium);
    transform: translateY(-1px);
}

.checkbox-item input[type="checkbox"] {
    width: 22px;
    height: 22px;
    accent-color: #007aff;
    cursor: pointer;
    border-radius: 4px var(--primary-blue), var(--accent-purple);
}

.checkbox-item span {
    font-size: 1rem;
    font-weight: 500;
    color: var(--neutral-text-secondary);
    letter-spacing: -0.01em;
}

/* Advanced settings section */
#rhythmAdvancedSettings, #articulationAdvancedSettings {
    background: var(--neutral-soft);
    border-radius: 12px;
    border: 1px solid var(--primary-blue), var(--accent-purple);
    padding: 24px;
    margin-top: 24px;
}

.rhythm-frequency-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.frequency-item {
    background: #f2f2f7;
    border: 1px solid #d2d2d7;
    padding: 16px;
    border-radius: 10px;
}

.frequency-item label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: #1d1d1f;
    margin-bottom: 8px;
    text-transform: none;
    font-variant: normal;
}

/* Modal buttons */
.modal-buttons {
    display: flex !important;
    gap: 12px !important;
    justify-content: flex-end !important;
    margin-top: 32px !important;
    padding-top: 24px !important;
    border-top: 1px solid var(--border-color) !important;
    position: relative !important;
    z-index: 10002 !important;
    pointer-events: auto !important;
}

/* All modal elements should be interactive */
.modal *, .modal-content *, .modal-body *, .modal-header *, .modal-buttons * {
    pointer-events: auto !important;
    position: relative !important;
}

/* Restore absolute positioning for modal toggle switches */
.modal .toggle-slider {
    position: absolute !important;
}

.modal .toggle-button {
    position: absolute !important;
}

/* Empty score message */
.empty-score-message {
    text-align: center;
    color: var(--neutral-text-light);
    font-size: 1.1rem;
    font-weight: 450;
    padding: 40px;
    letter-spacing: -0.01em;
}

/* Hide OSMD elements */
.osmd-title,
.osmd-subtitle, 
.osmd-composer,
.osmd-lyricist,
.osmd-credits,
.osmd-part-name,
text[class*="title"],
text[class*="Title"], 
text[class*="composer"],
text[class*="Composer"],
text[class*="part-name"],
text[class*="PartName"] {
    display: none !important;
    visibility: hidden !important;
}

#score svg {
    display: block !important;
    margin: 0 auto !important;
    border-radius: 8px;
    transition: opacity 0.3s ease, filter 0.3s ease;
}

/* Melody hidden state */
#score svg.melody-hidden {
    opacity: 0 !important;
    filter: blur(10px) !important;
}


/* Responsive design with Apple-style breakpoints */
@media (max-width: 599px) {
    body { 
        padding: 8px; 
    }
    
    .container {
        border-radius: 12px;
    }
    
    .header { 
        padding: 28px 16px 24px; 
    }

    .header-content {
        width: 100%;
        gap: 16px;
    }
    
    .header h1 { 
        font-size: 2.2rem;
        line-height: 1.06;
        margin-bottom: 0;
    }

    .header-text {
        width: 100%;
    }

    .header-controls {
        width: 100%;
        justify-content: space-between;
        gap: 20px;
        flex-wrap: nowrap;
    }

    .function-selector {
        flex: 1 1 0;
        min-width: 0;
    }

    .settings-dropdown {
        flex: 0 0 auto;
    }

    .function-btn {
        min-width: 0;
        width: 100%;
        padding: 12px 18px;
        font-size: 15px;
    }

    .settings-btn {
        min-width: 128px;
        padding: 12px 18px;
        font-size: 15px;
    }
    
    .controls { 
        padding: 24px; 
    }
    
    .control-row { 
        flex-direction: column; 
        align-items: stretch;
        gap: 20px; 
    }
    
    .buttons { 
        flex-direction: column;
        gap: 16px;
    }
    
    .button-group {
        justify-content: center;
    }
    
    .checkbox-grid { 
        grid-template-columns: 1fr; 
    }
    
    .modal-content { 
        width: 95%;
        border-radius: 12px;
    }
    
    .modal-body {
        padding: 24px;
    }
    
    .score-container { 
        padding: 16px; 
    }

    .melody-display-pair {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    #score { 
        border-radius: 8px;
        min-height: 240px; 
    }
    
    button {
        padding: 12px 24px;
        font-size: 1rem;
    }
    
    .btn-primary {
        padding: 16px 32px;
        font-size: 1.1rem;
    }

    #challengeModal .modal-content {
        display: flex !important;
        flex-direction: column !important;
        max-height: calc(100vh - 32px) !important;
    }

    #challengeModal .modal-body {
        flex: 1 1 auto !important;
        overflow-y: auto !important;
        -webkit-overflow-scrolling: touch !important;
        padding-bottom: 16px !important;
    }

    #challengeModal .modal-buttons {
        position: sticky !important;
        bottom: 0 !important;
        margin-top: 20px !important;
        padding-top: 16px !important;
        padding-bottom: calc(8px + env(safe-area-inset-bottom, 0px)) !important;
        background: #ffffff !important;
    }
}

@media (min-width: 600px) and (max-width: 899px) {
    .score-container { 
        padding: 24px; 
    }
    
    .control-row { 
        gap: 20px; 
    }
}

@media (min-width: 900px) {
    .control-row { 
        gap: 28px; 
    }
    
    .container:hover {
        box-shadow: 0 16px 48px rgba(0, 0, 0, 0.08);
        transform: translateY(-2px);
    }
}

@media (max-width: 599px), (orientation: landscape) and (max-height: 599px) {
    .controls .toolbar-main-actions {
        width: 100%;
        align-items: stretch;
    }

    .controls .toolbar-main-actions > .btn-primary {
        flex: 0 0 100% !important;
        width: 100% !important;
        max-width: 100% !important;
        min-width: 0 !important;
        box-sizing: border-box;
    }

    .controls .toolbar-utility-group {
        display: flex !important;
        flex-direction: row !important;
        flex-wrap: wrap !important;
        align-items: center !important;
        justify-content: center !important;
        width: 100% !important;
        gap: 10px !important;
    }

    .controls .toolbar-metronome-group {
        display: flex !important;
        flex: 0 1 auto !important;
        flex-wrap: nowrap !important;
        width: auto !important;
        min-width: 0 !important;
        max-width: calc(100% - 60px) !important;
    }

    .controls .toolbar-utility-group > .melody-visibility-btn,
    .controls .toolbar-metronome-group > .metronome-play-btn {
        flex: 0 0 50px !important;
    }

    .controls .toolbar-utility-group > .melody-visibility-btn,
    .controls .toolbar-metronome-group {
        order: 1;
    }

    .controls .practice-counter {
        order: 2;
        flex: 0 0 100% !important;
        width: 100% !important;
        justify-content: center !important;
    }
}

@media (max-width: 599px) and (orientation: portrait) {
    .control-row.melody-primary-row,
    .control-row.melody-primary-row.melody-primary-row-five {
        display: grid !important;
        grid-template-columns: 1fr !important;
        gap: 12px !important;
    }

    .control-row.melody-primary-row > .control-group,
    .control-row.melody-primary-row.melody-primary-row-five > .control-group {
        width: 100% !important;
        min-width: 0 !important;
    }
}

/* Final visibility button color overrides */
.melody-visibility-btn:not(.hidden-state):not(.is-active) {
    color: #1d1d1f !important;
}

#challengeModeToggleBtn.melody-visibility-btn.control-toggle-btn:not(.is-active) {
    color: var(--primary-blue) !important;
}

[data-theme="dark"] .melody-visibility-btn:not(.hidden-state):not(.is-active) {
    color: var(--neutral-black) !important;
}

[data-theme="dark"] #challengeModeToggleBtn.melody-visibility-btn.control-toggle-btn:not(.is-active) {
    color: var(--primary-blue) !important;
}

[data-theme="dark"] #challengeModal .modal-buttons {
    background: #1c1c1e !important;
}

@media (max-width: 599px) and (orientation: portrait) {
    .control-row.melody-primary-row,
    .control-row.melody-primary-row.melody-primary-row-five {
        display: grid !important;
        grid-template-columns: 1fr !important;
        gap: 12px !important;
    }

    .control-row.melody-primary-row > .control-group,
    .control-row.melody-primary-row.melody-primary-row-five > .control-group {
        width: 100% !important;
        min-width: 0 !important;
    }

    .metronome-play-btn {
        width: 50px !important;
        height: 50px !important;
        min-width: 50px !important;
        padding: 12px !important;
        flex: 0 0 50px !important;
        font-size: 14.4px !important;
    }

    .controls {
        padding: 12px !important;
    }

    .controls > .control-row {
        gap: 12px !important;
        margin-bottom: 12px !important;
    }

    .controls > .control-row:last-of-type {
        margin-bottom: 0 !important;
    }

    .controls .buttons,
    .controls .toolbar-main-actions,
    .controls .toolbar-utility-group,
    .controls .toolbar-nav-group,
    .controls .melody-range-pair {
        gap: 12px !important;
        row-gap: 12px !important;
    }
}

#settingsModal #metronomeVolumeSlider {
    box-shadow: inset 0 0 0 0.5px rgba(0, 0, 0, 0.45);
}

[data-theme="dark"] #settingsModal #metronomeVolumeSlider {
    box-shadow: inset 0 0 0 0.5px rgba(255, 255, 255, 0.18);
}

.modal .checkbox-item input[type="checkbox"] {
    -webkit-appearance: none;
    appearance: none;
    display: inline-grid;
    place-content: center;
    box-sizing: border-box;
    width: 24px !important;
    height: 24px !important;
    min-width: 24px;
    min-height: 24px;
    padding: 0 !important;
    margin: 0;
    flex: 0 0 24px;
    cursor: pointer;
    border: 1.5px solid #c7c7cc;
    border-radius: 50% !important;
    background: #ffffff !important;
    transition: border-color 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
    box-shadow: none !important;
    transform: none !important;
}

.modal .checkbox-item input[type="checkbox"]:hover {
    border-color: var(--primary-blue);
    background: #ffffff !important;
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.12) !important;
    transform: none !important;
}

.modal .checkbox-item input[type="checkbox"]::before {
    content: "";
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary-blue);
    transform: scale(0);
    transition: transform 0.18s ease;
}

.modal .checkbox-item input[type="checkbox"]:checked {
    border-color: var(--primary-blue);
    background: #ffffff !important;
}

.modal .checkbox-item input[type="checkbox"]:checked::before {
    transform: scale(1);
}

.modal .checkbox-item input[type="checkbox"]:focus,
.modal .checkbox-item input[type="checkbox"]:focus-visible {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.16) !important;
    transform: none !important;
}

[data-theme="dark"] .modal .checkbox-item input[type="checkbox"] {
    background: var(--neutral-white) !important;
    border-color: rgba(255, 255, 255, 0.18);
}

[data-theme="dark"] .modal .checkbox-item input[type="checkbox"]:checked {
    border-color: var(--primary-blue);
    background: var(--neutral-white) !important;
}

[data-theme="dark"] .modal .checkbox-item input[type="checkbox"]:hover,
[data-theme="dark"] .modal .checkbox-item input[type="checkbox"]:focus,
[data-theme="dark"] .modal .checkbox-item input[type="checkbox"]:focus-visible {
    background: var(--neutral-white) !important;
}

.melody-visibility-btn {
    width: 50px !important;
    height: 50px !important;
    min-width: 50px;
    padding: 12px !important;
    flex: 0 0 50px;
    border-radius: 14px !important;
}

.melody-visibility-btn .ui-icon {
    width: 24px !important;
    height: 24px !important;
}

/* Toggle switches for display options */
.display-toggle-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.display-toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.display-toggle-switch .slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: 0.4s;
    border-radius: 34px;
}

.display-toggle-switch .slider .slider-button {
    position: absolute;
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: #ffffff;
    transition: 0.4s;
    border-radius: 50%;
}

.display-toggle-switch input:checked + .slider {
    background-color: var(--primary-blue);
}

.display-toggle-switch input:checked + .slider .slider-button {
    transform: translateX(26px);
}

.toggle-container {
    position: relative;
    display: inline-block;
    width: 52px;
    height: 28px;
}

.toggle-input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    inset: 0;
    cursor: pointer;
    background: var(--neutral-light);
    border-radius: 999px;
    transition: all 0.25s ease;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.08);
}

.toggle-button {
    position: absolute;
    height: 22px;
    width: 22px;
    left: 3px;
    bottom: 3px;
    background: var(--neutral-white);
    border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.12);
    transition: all 0.25s ease;
}

.toggle-input:checked + .toggle-slider {
    background: var(--primary-blue);
}

.toggle-input:checked + .toggle-slider .toggle-button {
    transform: translateX(24px);
    box-shadow: 0 4px 10px rgba(0, 122, 255, 0.35);
}

[data-theme="dark"] .toggle-slider {
    background: #2d2d30;
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .display-toggle-switch .slider,
[data-theme="dark"] .switch .slider,
[data-theme="dark"] #challengeModal .switch .slider {
    background-color: #48484a !important;
}

[data-theme="dark"] .toggle-button {
    background: #1f1f22;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.6);
}

[data-theme="dark"] .toggle-input:checked + .toggle-slider {
    background: #4f8bff;
}

/* Note: Dark mode is now controlled by data-theme attribute instead of prefers-color-scheme */

/* Practice counter */
.practice-counter {
    display: flex;
    align-items: center;
    gap: 14px;
    min-height: 52px;
    padding: 8px 14px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background: #ffffff;
    color: var(--text-color);
    box-sizing: border-box;
    box-shadow:
        0 2px 8px var(--card-shadow),
        inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

.practice-counter label {
    font-size: 15px;
    font-weight: 500;
    line-height: 1.2;
}

.practice-counter-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.practice-counter-actions .btn-secondary {
    width: 36px;
    min-width: 36px;
    height: 36px;
    padding: 0;
    border-radius: 8px;
    background: #ffffff;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px var(--card-shadow);
    font-weight: 700;
    font-size: 18px;
    line-height: 1;
    transition: all 0.2s ease;
}

.practice-counter-actions .btn-secondary:hover {
    background: var(--neutral-light);
    transform: translateY(-1px) scale(1.05);
    box-shadow: 0 4px 16px var(--card-shadow-hover);
}

[data-theme="dark"] .practice-counter-actions .btn-secondary {
    background: var(--neutral-light);
    border-color: rgba(255, 255, 255, 0.2);
    color: #f0f0f0;
    box-shadow: 0 2px 8px var(--card-shadow);
}

[data-theme="dark"] .practice-counter-actions .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.06);
    box-shadow: 0 4px 16px var(--card-shadow-hover);
}

.practice-counter-actions span {
    min-width: 34px;
    text-align: center;
    font-weight: 700;
    font-size: 18px;
    line-height: 1;
}

[data-theme="dark"] .practice-counter {
    background: var(--neutral-light);
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow: 0 2px 8px var(--card-shadow);
}

/* Smooth animations and micro-interactions */
* {
    scroll-behavior: smooth;
}

button, .checkbox-item, select, input {
    will-change: transform;
}

/* CRITICAL FIX: Ensure buttons are clickable */
button {
    pointer-events: auto !important;
    z-index: 100 !important;
    position: relative !important;
    cursor: pointer !important;
}

/* Ensure all interactive elements are clickable */
select, input, .radio-item, .checkbox-item {
    pointer-events: auto !important;
    z-index: 50 !important;
    position: relative !important;
}

/* Fix for any potential overlay blocking clicks */
.control-row, .buttons, .button-group {
    pointer-events: auto !important;
    position: relative !important;
    z-index: 10 !important;
}

/* Ensure no pseudo-elements block clicks */
button::before,
button::after {
    pointer-events: none !important;
}

/* Focus indicators for accessibility */
button:focus-visible,
select:focus-visible,
input:focus-visible,
.checkbox-item:focus-within {
    outline: 2px solid var(--primary-blue);
    outline-offset: 2px;
}

/* 添加伪元素来创建更复杂的音乐装饰 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        /* 高音谱号暗示 - 椭圆形装饰 */
        radial-gradient(ellipse 3px 8px at 25% 25%, rgba(0, 0, 0, 0.025) 40%, transparent 41%),
        radial-gradient(ellipse 8px 3px at 75% 75%, rgba(0, 0, 0, 0.025) 40%, transparent 41%),
        /* 音符连线暗示 */
        linear-gradient(30deg, transparent 48%, rgba(0, 0, 0, 0.02) 49%, rgba(0, 0, 0, 0.02) 51%, transparent 52%),
        linear-gradient(-30deg, transparent 48%, rgba(0, 0, 0, 0.02) 49%, rgba(0, 0, 0, 0.02) 51%, transparent 52%),
        /* 骰子面暗示 */
        linear-gradient(90deg, rgba(0, 0, 0, 0.012) 1px, transparent 1px),
        linear-gradient(0deg, rgba(0, 0, 0, 0.012) 1px, transparent 1px);
    background-size: 
        400px 400px, 350px 350px,
        300px 300px, 280px 280px,
        120px 120px, 120px 120px;
    background-position: 
        100px 150px, 250px 300px,
        0 100px, 200px 50px,
        0 0, 0 0;
    pointer-events: none;
    z-index: -1;
}

/* Dark mode background decorations */
[data-theme="dark"] body::before {
    background-image: 
        /* 高音谱号暗示 - 椭圆形装饰 (白色在深色背景上) */
        radial-gradient(ellipse 3px 8px at 25% 25%, rgba(255, 255, 255, 0.04) 40%, transparent 41%),
        radial-gradient(ellipse 8px 3px at 75% 75%, rgba(255, 255, 255, 0.04) 40%, transparent 41%),
        /* 音符连线暗示 */
        linear-gradient(30deg, transparent 48%, rgba(255, 255, 255, 0.03) 49%, rgba(255, 255, 255, 0.03) 51%, transparent 52%),
        linear-gradient(-30deg, transparent 48%, rgba(255, 255, 255, 0.03) 49%, rgba(255, 255, 255, 0.03) 51%, transparent 52%),
        /* 骰子面暗示 */
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(0deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
}

/* Dark mode styles for all UI elements */
[data-theme="dark"] .container {
    background: var(--neutral-white);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
}

[data-theme="dark"] .controls {
    background: transparent;
}

/* Dark mode buttons */
[data-theme="dark"] .btn-primary {
    background: var(--primary-blue) !important;
    color: #FFFFFF !important;
    border-color: var(--primary-blue) !important;
    box-shadow: 0 4px 20px rgba(10, 132, 255, 0.3);
}

[data-theme="dark"] .btn-primary:hover {
    background: #1E8FFF !important;
    box-shadow: 0 6px 25px rgba(10, 132, 255, 0.4);
}

[data-theme="dark"] .btn-secondary {
    background: var(--neutral-light) !important;
    color: var(--neutral-black) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .btn-secondary:hover {
    background: var(--neutral-medium) !important;
}

[data-theme="dark"] .toolbar-main-actions .btn-secondary,
[data-theme="dark"] .buttons > .button-group > .btn-secondary {
    background: var(--neutral-light) !important;
    color: var(--neutral-black) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .toolbar-main-actions .btn-secondary:hover,
[data-theme="dark"] .buttons > .button-group > .btn-secondary:hover {
    background: var(--neutral-medium) !important;
    border-color: var(--border-color-medium) !important;
    color: var(--neutral-black) !important;
}

/* Dark mode form elements */
[data-theme="dark"] select,
[data-theme="dark"] input[type="number"] {
    background: var(--neutral-light) !important;
    color: var(--neutral-black) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] select:hover,
[data-theme="dark"] input[type="number"]:hover {
    background: var(--neutral-medium) !important;
    border-color: var(--border-color-medium) !important;
}

[data-theme="dark"] input[type="number"]:focus {
    background: var(--neutral-light) !important;
    color: var(--neutral-black) !important;
    border-color: var(--primary-blue) !important;
}

[data-theme="dark"] input[type="range"] {
    background: var(--neutral-medium);
}

[data-theme="dark"] input[type="range"]::-webkit-slider-thumb {
    background: #FFFFFF;
    border-color: var(--primary-blue);
}

[data-theme="dark"] input[type="radio"] {
    border-color: var(--border-color-medium);
}

[data-theme="dark"] input[type="radio"]:checked {
    background-color: var(--primary-blue);
    border-color: var(--primary-blue);
}

/* Dark mode text colors */
[data-theme="dark"] label,
[data-theme="dark"] .control-group label {
    color: var(--neutral-black) !important;
}

[data-theme="dark"] span {
    color: #FFFFFF !important;
}

/* Dark mode modal styling */
[data-theme="dark"] .modal {
    background: rgba(0, 0, 0, 0.8) !important;
}

[data-theme="dark"] .modal-content {
    background: var(--neutral-white) !important;
    border: none !important;
    box-shadow:
        0 28px 80px rgba(0, 0, 0, 0.5),
        0 10px 28px rgba(10, 132, 255, 0.12) !important;
}

[data-theme="dark"] #measureModal .modal-content {
    border: none !important;
    box-shadow:
        0 28px 80px rgba(0, 0, 0, 0.5),
        0 10px 28px rgba(10, 132, 255, 0.12) !important;
}

[data-theme="dark"] .modal-header {
    background: var(--neutral-white) !important;
    border-bottom-color: var(--border-color) !important;
}

[data-theme="dark"] #measureModal .modal-header {
    border-bottom-color: rgba(255, 255, 255, 0.08) !important;
    border-top-color: #007bff83 !important;
    background: var(--neutral-white) !important;
}

[data-theme="dark"] .modal-header h3 {
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .modal-body {
    background: var(--neutral-white) !important;
    color: var(--neutral-black) !important;
}

/* Dark mode checkbox and form elements in modals */
[data-theme="dark"] .checkbox-item {
    background: var(--neutral-light) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .checkbox-item:hover {
    background: var(--neutral-medium) !important;
}

[data-theme="dark"] .checkbox-item span {
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .checkbox-item input[type="checkbox"] {
    accent-color: var(--primary-blue) !important;
}

/* Dark mode advanced settings sections */
[data-theme="dark"] #rhythmAdvancedSettings,
[data-theme="dark"] #articulationAdvancedSettings {
    background: var(--neutral-light) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .frequency-item {
    background: var(--neutral-medium) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .frequency-item label {
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .rhythm-section h4 {
    color: var(--neutral-black) !important;
}

/* Dark mode radio items in modals */
[data-theme="dark"] .radio-item {
    background: transparent !important;
}

[data-theme="dark"] .radio-item:hover {
    background: var(--neutral-light) !important;
}

[data-theme="dark"] .radio-item label {
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .radio-item input[type="radio"] {
    accent-color: var(--primary-blue) !important;
}

/* Dark mode close button */
[data-theme="dark"] .close-modal,
[data-theme="dark"] .close-btn {
    background: var(--neutral-medium) !important;
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .close-modal:hover,
[data-theme="dark"] .close-btn:hover {
    background: var(--neutral-light) !important;
    color: var(--neutral-black) !important;
}

/* Dark mode select all button */
[data-theme="dark"] .btn-select-all {
    background: var(--neutral-light) !important;
    color: var(--neutral-black) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .btn-select-all:hover {
    background: var(--neutral-medium) !important;
}

/* Dark mode header styling */
[data-theme="dark"] .header {
    background: var(--neutral-white) !important;
    border-bottom-color: var(--border-color) !important;
}

[data-theme="dark"] .header h1 {
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .header p {
    color: var(--neutral-dark) !important;
}

/* Dark mode controls section */
[data-theme="dark"] .controls {
    background: var(--neutral-white) !important;
    border-bottom-color: var(--border-color) !important;
}

[data-theme="dark"] .control-row {
    background: transparent !important;
}

/* Dark mode theme switcher styling in dark mode */
[data-theme="dark"] .theme-switcher {
    background: var(--neutral-light) !important;
    border-color: var(--border-color) !important;
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .theme-switcher:hover {
    background: var(--neutral-medium) !important;
}

/* Dark mode language switcher adjustments */
[data-theme="dark"] .language-btn {
    background: var(--primary-blue) !important;
    border-color: var(--primary-blue) !important;
    color: #FFFFFF !important;
    box-shadow: 0 2px 8px rgba(10, 132, 255, 0.4);
}

[data-theme="dark"] .language-btn:hover {
    background: #1E8FFF !important;
    border-color: #1E8FFF !important;
    box-shadow: 0 4px 16px rgba(10, 132, 255, 0.5);
}

[data-theme="dark"] .language-menu {
    background: var(--neutral-white) !important;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
}

[data-theme="dark"] .language-option {
    background: var(--neutral-white) !important;
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .language-option:hover {
    background: var(--neutral-light) !important;
    color: #FFFFFF !important;
}

[data-theme="dark"] .language-option:active {
    background: var(--primary-blue) !important;
    color: #FFFFFF !important;
}

/* Settings Dropdown Styles */
.header {
    position: relative;
}

.settings-dropdown {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    z-index: 9998;
}

.settings-btn {
    background: var(--neutral-white);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    color: var(--neutral-black) !important;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 2px 8px var(--card-shadow);
    white-space: nowrap;
    min-width: 100px;
    justify-content: center;
}

.settings-btn:hover {
    background: var(--neutral-light);
    border-color: var(--border-color-medium);
    color: var(--neutral-black) !important;
    box-shadow: 0 4px 16px var(--card-shadow-hover);
    transform: translateY(-1px);
}

.settings-btn:active {
    background: var(--neutral-medium);
    color: var(--neutral-black) !important;
    transform: translateY(0);
    box-shadow: 0 2px 8px var(--card-shadow);
}
.settings-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: var(--neutral-white);
    border-radius: 16px;
    box-shadow: 0 12px 48px var(--card-shadow-hover);
    overflow: visible;
    z-index: 9999;
    min-width: 220px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border: 1px solid var(--border-color);
}

.settings-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#settingsModal .settings-menu {
    position: static !important;
    min-width: 0 !important;
    background: transparent !important;
    border: 0 !important;
    box-shadow: none !important;
}

.settings-section {
    padding: 0 0 14px;
}

.settings-section:not(:last-child) {
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 12px;
}

.settings-section-title {
    margin: 0 0 12px;
    padding: 12px 18px;
    font-size: 12px;
    font-weight: 700;
    color: #FFFFFF;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    background: #007bff83;
    border-radius: 14px;
    box-shadow: 0 8px 20px rgba(0, 123, 255, 0.1);
}

.theme-options,
.language-options {
    padding: 4px 12px 0;
}

.theme-option,
.language-option {
    padding: 12px 14px;
    font-size: 14px;
    font-weight: 400;
    color: var(--neutral-black);
    background: var(--neutral-white);
    cursor: pointer;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    white-space: nowrap;
    position: relative;
    z-index: 10000;
    border-radius: 12px;
}

.settings-section .midi-settings-row,
.settings-section .midi-status,
.settings-section .parameter-buttons {
    margin-left: 12px;
    margin-right: 12px;
}

.settings-section .midi-settings-row {
    padding: 10px 2px;
}

.settings-section .midi-settings-row > label,
.settings-section .midi-settings-row > span,
.settings-section .midi-settings-row > div,
.settings-section > label {
    padding-left: 2px;
    padding-right: 2px;
}

.theme-option:hover,
.language-option:hover {
    background: var(--primary-blue);
    color: #FFFFFF;
}

.theme-option:active,
.language-option:active {
    background: #005FCC;
    color: #FFFFFF;
}

#settingsModal .settings-section {
    padding: 22px 20px;
    margin-bottom: 16px;
    border: 1px solid var(--border-color-soft);
    border-radius: 20px;
    background: var(--neutral-light);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.78),
        0 10px 24px rgba(15, 23, 42, 0.04);
}

#settingsModal .settings-section:not(:last-child) {
    border-bottom: 1px solid var(--border-color-soft);
    margin-bottom: 16px;
}

#settingsModal .settings-section-title {
    margin: 0 0 18px;
    padding: 0;
    background: transparent;
    box-shadow: none;
    border-radius: 0;
    color: var(--neutral-dark);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.14em;
}

#settingsModal .theme-options,
#settingsModal .language-options {
    display: grid;
    gap: 8px;
    padding: 0;
}

#settingsModal .theme-option,
#settingsModal .language-option,
#settingsModal .midi-settings-row,
#settingsModal .midi-status {
    margin: 0;
    border: 1px solid var(--border-color-soft);
    border-radius: 14px;
    background: var(--neutral-white);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.85);
}

#settingsModal .theme-option,
#settingsModal .language-option {
    padding: 13px 14px;
}

#settingsModal .theme-option:hover,
#settingsModal .language-option:hover {
    background: rgba(0, 123, 255, 0.08);
    border-color: rgba(0, 123, 255, 0.24);
    color: var(--neutral-black);
    transform: translateY(-1px);
}

#settingsModal .theme-option:active,
#settingsModal .language-option:active {
    background: rgba(0, 123, 255, 0.14);
    border-color: rgba(0, 123, 255, 0.3);
    color: var(--neutral-black);
    transform: translateY(0);
}

#settingsModal .midi-settings-row {
    padding: 15px 16px;
}

#settingsModal .settings-section .midi-settings-row,
#settingsModal .settings-section .midi-status {
    margin-left: 0;
    margin-right: 0;
}

#settingsModal .settings-section .midi-settings-row + .midi-settings-row {
    margin-top: 12px;
}

#settingsModal .midi-settings-row label {
    margin-bottom: 8px;
}

#settingsModal .midi-settings-row > div {
    gap: 14px !important;
}

#settingsModal .midi-select {
    min-height: 44px;
    padding: 10px 12px;
}

#settingsModal .midi-status {
    margin-top: 14px;
    padding: 12px 16px;
}

#settingsModal #parameterExchangeSection {
    padding: 16px;
}

#settingsModal #parameterExchangeSection > div {
    display: flex;
    gap: 8px;
    width: 100%;
}

#settingsModal #parameterExchangeSection .btn-secondary {
    min-height: 34px;
    padding: 8px 12px;
    font-size: 13px;
    font-weight: 600;
    border-radius: 10px;
    box-shadow: none;
}

.theme-icon {
    width: 18px;
    height: 18px;
    color: currentColor;
}

.ui-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 auto;
    line-height: 0;
    color: currentColor;
}

.ui-icon svg {
    width: 100%;
    height: 100%;
    display: block;
}

.metronome-settings-btn .ui-icon {
    width: 14px;
    height: 14px;
}

.metronome-play-btn .ui-icon {
    width: 26px;
    height: 26px;
}

.melody-visibility-btn .ui-icon {
    width: 20px;
    height: 20px;
}

/* Metronome Controls Styles */
.metronome-controls {
    padding: 16px 0;
}

.metronome-tempo {
    margin-bottom: 16px;
}

.metronome-tempo label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--neutral-dark);
    margin-bottom: 8px;
}

.tempo-input-group {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.tempo-input {
    width: 80px;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    text-align: center;
    background: var(--neutral-white);
    color: var(--neutral-black);
}

.tempo-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 2px rgba(0, 122, 255, 0.2);
}

.tempo-preset-buttons {
    display: flex;
    gap: 6px;
}

.tempo-preset {
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--neutral-light);
    color: var(--neutral-black);
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
}

.tempo-preset:hover {
    background: var(--primary-blue);
    color: #FFFFFF;
    border-color: var(--primary-blue);
}

.metronome-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.metronome-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--primary-blue);
    color: #FFFFFF;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.metronome-btn:hover {
    background: #005FCC;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3);
}

.metronome-btn.active {
    background: var(--accent-orange);
}

.metronome-btn.active:hover {
    background: #E6850E;
}

.metronome-icon {
    font-size: 16px;
}

.metronome-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--neutral-medium);
    transition: all 0.1s ease;
}

.metronome-indicator.beat {
    background: var(--accent-green);
    transform: scale(1.3);
    box-shadow: 0 0 8px var(--accent-green);
}

/* Dark mode metronome styles */
[data-theme="dark"] .tempo-input {
    background: var(--neutral-light) !important;
    color: var(--neutral-black) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .tempo-preset {
    background: var(--neutral-medium) !important;
    color: var(--neutral-black) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] .tempo-preset:hover {
    background: var(--primary-blue) !important;
    color: #FFFFFF !important;
}

[data-theme="dark"] .metronome-btn {
    background: var(--primary-blue) !important;
    color: #FFFFFF !important;
}

[data-theme="dark"] .metronome-btn:hover {
    background: #1E8FFF !important;
}

[data-theme="dark"] .metronome-btn.active {
    background: var(--accent-orange) !important;
}

[data-theme="dark"] .metronome-indicator {
    background: var(--neutral-medium) !important;
}

[data-theme="dark"] .metronome-indicator.beat {
    background: var(--accent-green) !important;
}

/* Dark mode settings styles */
[data-theme="dark"] .settings-btn {
    background: var(--neutral-light) !important;
    border-color: var(--border-color) !important;
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .settings-btn:hover {
    background: var(--neutral-medium) !important;
    border-color: var(--border-color-medium) !important;
}

[data-theme="dark"] .settings-menu {
    background: var(--neutral-white) !important;
    border-color: var(--border-color) !important;
    box-shadow: 0 16px 64px rgba(0, 0, 0, 0.8) !important;
    z-index: 9999 !important;
}

[data-theme="dark"] .settings-section-title {
    background: #007bff83 !important;
    color: #FFFFFF !important;
}

[data-theme="dark"] .theme-option, 
[data-theme="dark"] .language-option {
    background: var(--neutral-white) !important;
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .theme-option:hover,
[data-theme="dark"] .language-option:hover {
    background: var(--primary-blue) !important;
    color: #FFFFFF !important;
}

[data-theme="dark"] .theme-option:active,
[data-theme="dark"] .language-option:active {
    background: #005FCC !important;
    color: #FFFFFF !important;
}

[data-theme="dark"] #settingsModal .settings-section {
    background: rgba(255, 255, 255, 0.03) !important;
    border-color: rgba(255, 255, 255, 0.08) !important;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.05),
        0 12px 28px rgba(0, 0, 0, 0.28) !important;
}

[data-theme="dark"] #settingsModal .settings-section-title {
    background: transparent !important;
    color: rgba(255, 255, 255, 0.72) !important;
}

[data-theme="dark"] #settingsModal .theme-option,
[data-theme="dark"] #settingsModal .language-option,
[data-theme="dark"] #settingsModal .midi-settings-row,
[data-theme="dark"] #settingsModal .midi-status {
    background: rgba(255, 255, 255, 0.04) !important;
    border-color: rgba(255, 255, 255, 0.08) !important;
    color: var(--neutral-black) !important;
    box-shadow: none !important;
}

[data-theme="dark"] #settingsModal .theme-option:hover,
[data-theme="dark"] #settingsModal .language-option:hover {
    background: rgba(10, 132, 255, 0.16) !important;
    border-color: rgba(10, 132, 255, 0.28) !important;
    color: var(--neutral-black) !important;
}

[data-theme="dark"] #settingsModal .theme-option:active,
[data-theme="dark"] #settingsModal .language-option:active {
    background: rgba(10, 132, 255, 0.22) !important;
    border-color: rgba(10, 132, 255, 0.34) !important;
    color: var(--neutral-black) !important;
}

/* Dark mode function selector styles */
[data-theme="dark"] .function-btn {
    background: var(--primary-blue) !important;
    border-color: var(--primary-blue) !important;
    color: #FFFFFF !important;
}

[data-theme="dark"] .function-btn span {
    color: #FFFFFF !important;
}

[data-theme="dark"] .function-btn:hover {
    background: #1E8FFF !important;
    border-color: #1E8FFF !important;
}

[data-theme="dark"] .function-btn:active {
    background: #0056CC !important;
}

[data-theme="dark"] .function-menu {
    background: var(--neutral-white) !important;
    border-color: var(--border-color) !important;
    box-shadow: 0 16px 64px rgba(0, 0, 0, 0.8) !important;
}

[data-theme="dark"] .function-option {
    background: var(--neutral-white) !important;
    color: var(--neutral-black) !important;
}

/* 深色模式下的悬浮颜色 */
[data-theme="dark"] .function-option:hover,
[data-theme="dark"] .function-option:focus {
    background: rgba(10, 132, 255, 0.2) !important;
    color: var(--primary-blue) !important;
}

[data-theme="dark"] .function-option:active {
    background: #0056CC !important;
    color: #FFFFFF !important;
}

/* Dark mode melody visibility button */
[data-theme="dark"] .melody-visibility-btn {
    background: var(--neutral-light) !important;
    border-color: var(--border-color) !important;
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .melody-visibility-btn:hover {
    background: var(--neutral-medium) !important;
    border-color: var(--border-color-medium) !important;
}

[data-theme="dark"] .melody-visibility-btn.hidden-state {
    background: var(--primary-blue) !important;
    color: #FFFFFF !important;
    border-color: var(--primary-blue) !important;
}

[data-theme="dark"] .melody-visibility-btn.hidden-state:hover {
    background: #1E8FFF !important;
    border-color: #1E8FFF !important;
}

[data-theme="dark"] .melody-secondary-card {
    background: var(--neutral-light) !important;
    border-color: var(--border-color) !important;
    box-shadow: 0 2px 8px var(--card-shadow);
}

[data-theme="dark"] .melody-secondary-label {
    color: var(--neutral-black) !important;
}

[data-theme="dark"] .melody-visibility-btn.control-toggle-btn.is-active {
    background: var(--primary-blue) !important;
    color: #ffffff !important;
    border-color: var(--primary-blue) !important;
}

[data-theme="dark"] .melody-visibility-btn.control-toggle-btn.is-active:hover {
    background: #1E8FFF !important;
    border-color: #1E8FFF !important;
}

/* Language Switcher Styles (legacy - keep for compatibility) */

/* Override global button styles specifically for language button */
button.language-btn {
    color: #FFFFFF !important;
    background: #007AFF !important;
}

button.language-btn:hover {
    color: #FFFFFF !important;
    background: #0056CC !important;
}

button.language-btn:active {
    color: #FFFFFF !important;
    background: #004499 !important;
}

button.language-btn:focus {
    color: #FFFFFF !important;
    background: #007AFF !important;
}

.header-content {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    position: relative;
}

.header-text {
    flex: 1;
    text-align: center;
}

.header-controls {
    position: absolute;
    left: 0;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    z-index: 9997;
    padding: 0 0;
}

/* Function Selector Styles */
.function-selector {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    z-index: 9998;
}

.function-btn {
    background: var(--primary-blue);
    border: 1px solid var(--primary-blue);
    border-radius: 12px;
    padding: 10px 16px;
    font-size: 14px;
    font-weight: 500;
    color: #FFFFFF !important;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
    white-space: nowrap;
    min-width: 120px;
    justify-content: center;
    width: 100%;
}

.function-btn span {
    color: #FFFFFF !important;
}

.function-btn:hover {
    background: #0056CC;
    border-color: #0056CC;
    color: #FFFFFF !important;
    box-shadow: 0 4px 16px rgba(0, 122, 255, 0.4);
    transform: translateY(-1px);
}

.function-btn:active {
    background: #004499;
    color: #FFFFFF !important;
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
}

.function-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    background: var(--neutral-white);
    border-radius: 16px;
    box-shadow: 0 12px 48px var(--card-shadow-hover);
    overflow: visible;
    z-index: 9999;
    width: 100%;
    min-width: 100%;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border: 1px solid var(--border-color);
}

.function-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.function-option {
    padding: 14px 20px;
    font-size: 14px;
    font-weight: 400;
    color: var(--neutral-black);
    background: var(--neutral-white);
    cursor: pointer;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    white-space: nowrap;
    position: relative;
    z-index: 10000;
}

.function-option:first-child {
    border-top-left-radius: 16px;
    border-top-right-radius: 16px;
}

.function-option:last-child {
    border-bottom-left-radius: 16px;
    border-bottom-right-radius: 16px;
}

/* 功能菜单悬浮风格（与简谱一致：淡色背景 + 主题色文字） */
.function-option:hover,
.function-option:focus {
    background: rgba(0, 122, 255, 0.12);
    color: #0056CC;
}

.function-option:active {
    background: #0056CC;
    color: #FFFFFF;
}

.function-icon {
    font-size: 16px;
    width: 20px;
    text-align: center;
}

/* Theme Switcher Styles */
.theme-switcher {
    background: var(--neutral-white);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    font-size: 18px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px var(--card-shadow);
}

.theme-switcher:hover {
    background: var(--neutral-light);
    box-shadow: 0 4px 16px var(--card-shadow-hover);
    transform: translateY(-1px);
}

.theme-switcher:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px var(--card-shadow);
}

/* Override global button styles for theme switcher */
button.theme-switcher {
    color: var(--neutral-black) !important;
    background: var(--neutral-white) !important;
}

button.theme-switcher:hover {
    color: var(--neutral-black) !important;
    background: var(--neutral-light) !important;
}

.language-switcher {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.language-btn {
    background: #007AFF;
    border: 1px solid #007AFF;
    border-radius: 12px;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    color: #FFFFFF !important;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
    white-space: nowrap;
    min-width: 120px;
    justify-content: center;
}

.language-btn:hover {
    background: #0056CC;
    border-color: #0056CC;
    color: #FFFFFF !important;
    box-shadow: 0 4px 16px rgba(0, 122, 255, 0.4);
    transform: translateY(-1px);
}

.language-btn:active {
    background: #004499;
    color: #FFFFFF !important;
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(0, 122, 255, 0.3);
}

/* 风格3: 毛玻璃效果 - 备选方案2 
.language-btn {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    padding: 12px 20px;
    font-size: 14px;
    font-weight: 500;
    color: var(--neutral-black);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    white-space: nowrap;
    min-width: 140px;
    justify-content: center;
}

.language-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.language-btn:active {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
}
*/

.language-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: #FFFFFF;
    border-radius: 12px;
    box-shadow: 0 8px 32px var(--card-shadow-hover);
    overflow: hidden;
    z-index: 1000;
    min-width: 140px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
}

/* Show menu on hover */
.language-switcher:hover .language-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.language-option {
    padding: 12px 16px;
    font-size: 14px;
    font-weight: 400;
    color: #1d1d1f;
    background: #FFFFFF;
    cursor: pointer;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.language-option:hover {
    background: #E3F2FD !important;
    color: #007AFF !important;
}

.language-option:active {
    background: #007AFF !important;
    color: #FFFFFF !important;
}

/* Additional override for language options */
.language-menu .language-option:hover {
    background: #E3F2FD !important;
    color: #1d1d1f !important;
}

.language-menu .language-option:active {
    background: #007AFF !important;
    color: #FFFFFF !important;
}

/* Note: Language switcher dark mode styles are handled by [data-theme="dark"] selectors */

/* Responsive adjustments */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 20px;
        align-items: center;
        position: static;
    }
    
    .header-text {
        text-align: center;
        order: 2;
    }

    .header-text p[data-i18n="app.subtitle"] {
        display: none;
    }
    
    .header-controls {
        position: static;
        transform: none;
        justify-content: center;
        order: 1;
        gap: 16px;
        flex-wrap: wrap;
    }
    
    .settings-dropdown {
        align-items: center;
    }
    
    .settings-menu {
        left: 50%;
        transform: translateX(-50%) translateY(-10px);
        min-width: 240px;
    }
    
    .settings-menu.show {
        transform: translateX(-50%) translateY(0);
    }
    
    .settings-btn {
        min-width: 120px;
        padding: 12px 20px;
    }

    .function-selector {
        align-items: stretch;
    }

    .function-menu {
        left: 0;
        width: 100%;
        min-width: 100%;
        transform: translateY(-10px);
    }

    .function-menu.show {
        transform: translateY(0);
    }

    .function-btn {
        min-width: 140px;
        padding: 12px 20px;
    }

    .metronome-compact {
        padding: 6px 10px;
        gap: 6px;
    }
    
    .bpm-display {
        width: 40px;
        font-size: 13px;
    }
    
    .metronome-play-btn {
        width: 26px;
        height: 26px;
        font-size: 11px;
    }
    
    .metronome-beat-indicator {
        width: 6px;
        height: 6px;
    }
}


/* Mobile landscape optimization - 手机横屏优化 */
@media (orientation: landscape) and (max-height: 599px) {
    body {
        padding: 0;
        margin: 0;
    }
    
    .container {
        border-radius: 4px;
        margin: 0;
    }
    
    .header {
        padding: 14px 12px 12px;
    }

    .header-content {
        display: block;
        position: relative;
        min-height: 48px;
    }

    .header-text {
        width: 100%;
        padding: 0 160px;
        text-align: center;
    }
    
    .header h1 {
        font-size: 1.9rem;
        line-height: 1.05;
        margin-bottom: 0;
    }

    .header-text p[data-i18n="app.subtitle"] {
        display: none;
    }

    .header-controls {
        position: absolute;
        inset: 0;
        transform: none;
        justify-content: space-between;
        align-items: center;
        gap: 16px;
        flex-wrap: nowrap;
        padding: 0 4px;
    }

    .function-btn {
        min-width: 132px;
        padding: 10px 18px;
        font-size: 15px;
    }

    .settings-btn {
        min-width: 108px;
        padding: 10px 16px;
        font-size: 15px;
    }
    
    .controls {
        padding: 6px;
    }

    .buttons {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    .toolbar-main-actions,
    .toolbar-utility-group {
        width: 100%;
        justify-content: center;
        gap: 12px;
        row-gap: 10px;
    }

    .toolbar-utility-group {
        display: grid;
        grid-template-columns: repeat(3, max-content);
        justify-content: center;
        align-items: center;
        order: 1;
        flex-wrap: nowrap;
    }

    .toolbar-metronome-group {
        flex: 0 0 222px;
        width: 222px;
        min-width: 222px;
    }

    .buttons .toolbar-metronome-card {
        width: 164px;
        max-width: none;
    }

    .toolbar-main-actions {
        order: 2;
        flex-wrap: wrap;
    }

    .toolbar-nav-group {
        flex-wrap: wrap;
        justify-content: center;
    }

    .practice-counter {
        flex: 0 0 auto;
        min-width: max-content;
    }
    
    .score-container {
        padding: 0;
    }
    
    #score {
        min-height: calc(100svh - 56px);
        max-width: calc(100vw - 8px);
        width: calc(100vw - 8px);
        padding: 3px;
        margin: 0;
        border-radius: 16px;
    }
    
    /* 横屏时旋律可以更大 */
    #score svg {
        max-width: 100% !important;
        width: auto !important;
        height: auto !important;
        min-width: 300px;
        display: block !important;
        margin: 0 !important;
        padding: 0 !important;
        border: none !important;
    }
    
    #score .osmd-container {
        max-width: 100% !important;
        width: 100% !important;
        padding: 0 !important;
        margin: 0 !important;
        border: none !important;
    }
    
    button {
        padding: 4px 8px;
        font-size: 0.8rem;
    }
    
    .btn-primary {
        padding: 6px 12px;
        font-size: 0.85rem;
    }

    .toolbar-main-actions > .btn-primary {
        min-height: 52px;
        min-width: 116px;
        padding: 0 24px;
        font-size: 1.05rem;
        line-height: 1;
        flex: 0 0 auto;
    }

    .control-row.melody-primary-row {
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 16px;
    }

    .control-row.melody-secondary-row.melody-secondary-row-four,
    .control-row.melody-secondary-row.melody-secondary-row-three {
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 16px;
    }
}

@media (max-width: 599px) {
    .header-controls {
        gap: 20px;
        flex-wrap: nowrap;
    }

    .function-btn {
        min-width: 0;
        width: 100%;
        padding: 12px 18px;
        font-size: 15px;
    }

    .settings-btn {
        min-width: 128px;
        padding: 12px 18px;
        font-size: 15px;
    }
}

/* Extreme small mobile devices (very small phones) */
@media (max-width: 360px) {
    body {
        padding: 0;
        margin: 0;
    }
    
    .container {
        border-radius: 2px;
        margin: 0;
    }
    
    .score-container { 
        padding: 0; 
    }
    
    #score { 
        min-height: 180px;
        max-width: calc(100vw - 6px);
        width: calc(100vw - 6px);
        padding: 2px;
        margin: 0;
        border-radius: 16px;
    }
    
    /* 极度紧凑的音乐显示 - 完全无边距 */
    #score svg {
        min-width: 150px;
        display: block !important;
        margin: 0 !important;
        padding: 0 !important;
        border: none !important;
    }
    
    #score .osmd-container {
        max-width: 100% !important;
        width: 100% !important;
        padding: 0 !important;
        margin: 0 !important;
        border: none !important;
    }
    
    .header { 
        padding: 12px 2px; 
    }
    
    .header h1 { 
        font-size: 1.4rem; 
    }
    
    .controls { 
        padding: 4px; 
    }
    
    button {
        padding: 4px 8px;
        font-size: 0.8rem;
    }
    
    .btn-primary {
        padding: 6px 12px;
        font-size: 0.85rem;
    }
}

@media (min-width: 600px) and (max-width: 899px) {
    .score-container { 
        padding: 24px; 
    }
    
    .control-row { 
        gap: 20px; 
    }
}

@media (min-width: 900px) {
    .control-row { 
        gap: 28px; 
    }
    
    .container:hover {
        box-shadow: 0 16px 48px rgba(0, 0, 0, 0.08);
        transform: translateY(-2px);
    }
}