/* GuitarFB - Optimized Styles */
/* Version: 1.4.0 - Mobile Optimization */

/* ============================================
   CSS变量系统 - 统一管理
   ============================================ */

:root {
    /* 字体系统 */
    --font-primary: 'Roboto', 'Noto Sans SC', system-ui, sans-serif;
    --font-secondary: 'Noto Sans SC', 'Roboto', system-ui, sans-serif;
    
    /* 字体大小 - PC端默认值 */
    --text-xs: 13px;
    --text-sm: 15px;
    --text-md: 17px;
    --text-lg: 18px;
    --text-xl: 21px;
    --text-xxl: 23px;
    
    /* 字重 */
    --weight-normal: 400;
    --weight-medium: 500;
    --weight-bold: 700;
    
    /* UI尺寸 - PC端默认值 */
    --height-sm: 41px;
    --height-md: 50px;
    --height-lg: 59px;
    --height-xl: 63px;
    --height-xxl: 70px;
    
    --padding-xs: 7px 13px;
    --padding-sm: 9px 14px;
    --padding-md: 11px 20px;
    --padding-lg: 13px 25px;
    
    --radius-sm: 25px;
    --radius-md: 29px;
    --radius-lg: 36px;
    --radius-xl: 43px;
    
    /* 响应式变量 - PC端默认值 */
    --body-padding: 16px;
    --container-padding: 24px 28px 8px;
    --container-radius: 28px;
    --title-input-width: 380px;
    --gen-btn-min-width: 140px;
    --range-width: 140px;
    --bpm-min-width: 64px;
    
    /* 浅色主题颜色 */
    --color-bg-body: #2c3e2f;
    --color-bg-container: #fdf8e7;
    --color-bg-title: #e2dccd;
    --color-bg-panel: #ece3d0;
    --color-bg-group: #fff7ea;
    --color-bg-tool: #e2dccd;
    --color-bg-metro: #25201a;
    --color-bg-metro-group: #3e3327;
    --color-bg-canvas: #f9f2dc;
    --color-bg-input: rgba(255,255,255,0.9);
    --color-bg-input-dark: rgba(0,0,0,0.3);
    
    --color-text-primary: #4a2e1e;
    --color-text-secondary: #8b7a65;
    --color-text-metro: #f0e3c9;
    --color-text-bpm: #ffcc77;
    --color-text-countdown: #ffaa66;
    
    --color-btn-primary: #4a6a3b;
    --color-btn-danger: #a1220a;
    --color-btn-metro: #5f4a32;
    --color-btn-metro-active: #aa4c1c;
    --color-btn-mode: #8b6b42;
    --color-btn-mode-active: #2c4a1e;
    
    --color-border: #bcab8a;
    --color-border-dark: #5a4a3a;
    --color-toggle-off: #5a4a3a;
    --color-toggle-on: #e68a2e;
    --color-beat-off: #3a2e24;
    --color-beat-on: #ffaa33;
}

/* 深色主题 - 只覆盖颜色变量 */
[data-theme="dark"] {
    --color-bg-body: #1a1a2e;
    --color-bg-container: #16213e;
    --color-bg-title: #0f3460;
    --color-bg-panel: #0d1b2a;
    --color-bg-group: #16213e;
    --color-bg-tool: #0f3460;
    --color-bg-metro: #1a1a2e;
    --color-bg-metro-group: #1b263b;
    --color-bg-canvas: #0d1b2a;
    --color-bg-input: rgba(30, 40, 60, 0.9);
    --color-bg-input-dark: rgba(0,0,0,0.3);
    
    --color-text-primary: #eaeaea;
    --color-text-secondary: #a0a0a0;
    --color-text-metro: #e0e0e0;
    --color-text-bpm: #ffd93d;
    --color-text-countdown: #ff9f43;
    
    --color-btn-primary: #4a69bd;
    --color-btn-danger: #e53935;
    --color-btn-metro: #3e50b4;
    --color-btn-metro-active: #e53935;
    --color-btn-mode: #5c6bc0;
    --color-btn-mode-active: #3949ab;
    
    --color-border: #424242;
    --color-border-dark: #37474f;
    --color-toggle-off: #455a64;
    --color-toggle-on: #ff9800;
    --color-beat-off: #455a64;
    --color-beat-on: #ff9800;
}

/* ============================================
   基础样式
   ============================================ */

*, *::before, *::after {
    user-select: none;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    background: var(--color-bg-body);
    font-family: var(--font-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 16px;
    transition: background 0.3s ease;
}

/* ============================================
   容器与布局
   ============================================ */

.container {
    background: var(--color-bg-container);
    border-radius: 28px;
    box-shadow: 0 20px 35px rgba(0,0,0,0.3);
    padding: 24px 28px 8px;
    max-width: 1450px;
    width: 100%;
    margin: 0 auto;
    transition: background 0.3s ease;
}

/* ============================================
   Canvas
   ============================================ */

canvas {
    display: block;
    margin: 10px auto 0;
    background: var(--color-bg-canvas);
    border-radius: 16px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    cursor: crosshair;
    width: 90%;
    height: auto;
    touch-action: none;
    transition: background 0.3s ease;
}

/* ============================================
   标题栏
   ============================================ */

.title-bar {
    display: flex;
    gap: 16px;
    align-items: center;
    justify-content: center;
    margin: -10px auto 3px;
    background: var(--color-bg-title);
    padding: var(--padding-md);
    border-radius: 50px;
    width: fit-content;
    flex-wrap: wrap;
    transition: background 0.3s ease;
}

.title-bar label {
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
    font-size: var(--text-lg);
}

#boardTitle {
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--padding-sm);
    font-size: var(--text-lg);
    width: 380px;
    font-family: inherit;
    text-align: center;
    color: var(--color-text-primary);
    transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

/* ============================================
   按钮基础样式
   ============================================ */

.btn {
    border: none;
    color: white;
    padding: var(--padding-sm);
    border-radius: var(--radius-lg);
    font-weight: var(--weight-bold);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: 0.2s;
    height: var(--height-sm);
}

.btn:hover {
    opacity: 0.9;
    transform: scale(0.98);
}

.lang-toggle, .theme-toggle {
    background: var(--color-border-dark);
    min-width: 56px;
}

.lang-toggle:hover, .theme-toggle:hover {
    background: #3a2e24;
}

/* ============================================
   调音设置
   ============================================ */

.tuning-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-top: 12px;
}

.tuning-toggle {
    background: var(--color-border-dark);
    color: white;
    padding: var(--padding-lg);
    border-radius: 50px;
    font-weight: var(--weight-bold);
    font-size: var(--text-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: 0.2s;
    min-width: 140px;
    height: var(--height-lg);
    border: none;
}

.tuning-toggle:hover { background: #3a2e24; }
.tuning-toggle.active { background: var(--color-btn-primary); }
.tuning-toggle .arrow {
    display: inline-block;
    transition: transform 0.2s;
}
.tuning-toggle.active .arrow { transform: rotate(180deg); }

.tuning-panel {
    background: var(--color-bg-tool);
    border-radius: 40px;
    padding: 0;
    margin: 20px 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    align-items: center;
}

.tuning-panel.open {
    max-height: 220px;
    padding: 18px 22px;
}

.tuning-group, .tuning-preset {
    background: var(--color-bg-group);
    border-radius: var(--radius-xl);
    padding: var(--padding-md);
    display: flex;
    gap: 10px;
    align-items: center;
    justify-content: center;
    height: var(--height-lg);
    transition: background 0.3s ease;
}

.tuning-group label, .tuning-preset label {
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
    font-size: var(--text-md);
}

.tuning-group select, .tuning-preset select {
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--padding-sm);
    font-size: var(--text-md);
    cursor: pointer;
    font-weight: var(--weight-medium);
    color: var(--color-text-primary);
    transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.tuning-group select { min-width: 60px; height: var(--height-sm); }
.tuning-preset select { min-width: 200px; height: var(--height-sm); }

/* 调音组换行 */
.tuning-row-break {
    flex-basis: 100%;
    height: 0;
}

/* ============================================
   主面板
   ============================================ */

.main-panel {
    background: var(--color-bg-panel);
    border-radius: var(--radius-xl);
    padding: 20px 26px;
    margin: -34px 0 10px;
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.1), 0 8px 18px rgba(0,0,0,0.1);
    transition: margin-top 0.3s ease, background 0.3s ease;
}

.main-panel.shift-down { margin-top: 1px; }

.param-row {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: flex-end;
    justify-content: center;
    margin-bottom: 20px;
}

.param-group {
    background: var(--color-bg-group);
    border-radius: var(--radius-xl);
    padding: var(--padding-md);
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
    height: var(--height-lg);
    transition: background 0.3s ease;
}

.param-group label {
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
    font-size: var(--text-md);
}

.param-group select {
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--padding-sm);
    font-size: var(--text-md);
    cursor: pointer;
    font-weight: var(--weight-medium);
    height: var(--height-sm);
    color: var(--color-text-primary);
    transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.param-group-tall { height: var(--height-xxl); }
.param-group-tall select { height: var(--height-sm); }
#scaleModeSelect { font-size: var(--text-sm); }

/* ============================================
   按钮组
   ============================================ */

.btn-group {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-top: 8px;
    flex-wrap: wrap;
}

.gen-btn {
    background: var(--color-btn-primary);
    border: none;
    color: white;
    padding: var(--padding-lg);
    border-radius: 50px;
    font-weight: var(--weight-bold);
    font-size: var(--text-md);
    cursor: pointer;
    transition: 0.2s;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
    min-width: 140px;
    height: var(--height-lg);
}

.gen-btn:hover { background: #2c4a1e; transform: scale(0.97); }

/* ============================================
   工具栏
   ============================================ */

.toolbar {
    margin-top: 16px;
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    justify-content: center;
    align-items: center;
}

.tool-group {
    background: var(--color-bg-tool);
    padding: var(--padding-sm);
    border-radius: 50px;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    align-items: center;
    height: var(--height-lg);
    transition: background 0.3s ease;
}

.tool-group-tall { height: var(--height-xxl); }
.tool-group-label {
    font-weight: var(--weight-bold);
    color: var(--color-text-primary);
    font-size: var(--text-sm);
}

.mode-btn {
    background: var(--color-btn-mode);
    border: none;
    color: white;
    padding: var(--padding-sm);
    border-radius: var(--radius-lg);
    font-weight: var(--weight-bold);
    font-size: var(--text-sm);
    cursor: pointer;
    height: var(--height-sm);
}

.mode-btn.active {
    background: var(--color-btn-mode-active) !important;
    box-shadow: inset 0 0 3px #ffd966;
    border: 1px solid gold;
}

/* PC端标注文本输入框样式 */
.annotation-text-input {
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 4px 8px;
    font-size: var(--text-md);
    width: 100px;
    text-align: center;
    color: var(--color-text-primary);
    transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.annotation-group-desktop .annotation-text-input {
    margin: 0 4px;
}

.color-preset {
    background: var(--color-bg-input);
    padding: 6px 16px;
    border-radius: var(--radius-xl);
    display: flex;
    gap: 12px;
    align-items: center;
    height: var(--height-sm);
    transition: background 0.3s ease;
}

.color-btn {
    width: 24px;
    height: 24px;
    border-radius: 10px;
    cursor: pointer;
    border: 2px solid var(--color-border);
    transition: 0.1s;
    flex-shrink: 0;
}

input[type="color"] {
    width: var(--height-sm);
    height: var(--height-sm);
    border: 2px solid var(--color-border);
    border-radius: 10px;
    cursor: pointer;
    padding: 1px;
    flex-shrink: 0;
}

input[type="text"], input[type="number"] {
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--padding-xs);
    font-size: var(--text-sm);
    cursor: pointer;
    font-weight: var(--weight-medium);
    height: var(--height-sm);
    color: var(--color-text-primary);
    transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

button {
    background: var(--color-btn-primary);
    border: none;
    color: white;
    padding: var(--padding-sm);
    border-radius: var(--radius-lg);
    font-weight: var(--weight-bold);
    font-size: var(--text-sm);
    cursor: pointer;
    height: var(--height-sm);
}

#clearAllBtn { background: var(--color-btn-danger); }
#clearAllBtn:hover { background: #7a1a08; }

/* ============================================
   节拍器面板
   ============================================ */

.metronome-panel {
    margin-top: 22px;
    background: var(--color-bg-metro);
    border-radius: 56px;
    padding: 14px 22px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 14px;
    transition: background 0.3s ease;
}

.metro-group {
    background: var(--color-bg-metro-group);
    padding: var(--padding-sm);
    border-radius: 50px;
    display: flex;
    gap: 8px;
    align-items: center;
    color: var(--color-text-metro);
    height: var(--height-lg);
    transition: background 0.3s ease;
}

.metro-label {
    font-size: var(--text-sm);
    white-space: nowrap;
    font-weight: var(--weight-medium);
}

.metro-group select {
    background: var(--color-bg-input-dark);
    color: var(--color-text-metro);
    border: 1px solid var(--color-border-dark);
    border-radius: var(--radius-sm);
    padding: var(--padding-xs);
    font-size: var(--text-sm);
    cursor: pointer;
    font-weight: var(--weight-medium);
    height: var(--height-sm);
    transition: background 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.metro-timer-input {
    width: 64px;
    background: var(--color-bg-input-dark);
    color: var(--color-text-countdown);
    border: none;
    border-radius: 32px;
    padding: 6px 10px;
    font-size: 14px;
    text-align: center;
    transition: background 0.3s ease, color 0.3s ease;
}

.bpm-value {
    background: var(--color-bg-input-dark);
    padding: var(--padding-sm);
    border-radius: var(--radius-md);
    font-size: var(--text-xl);
    font-weight: var(--weight-bold);
    min-width: 64px;
    text-align: center;
    color: var(--color-text-bpm);
    cursor: pointer;
    transition: background 0.3s ease, color 0.3s ease;
}

input[type="range"] { width: 140px; }

.metro-btn {
    background: var(--color-btn-metro);
    padding: var(--padding-sm);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    height: var(--height-sm);
    transition: background 0.3s ease;
}

.metro-btn.metro-btn-active { background: var(--color-btn-metro-active); }

/* ============================================
   开关组件
   ============================================ */

.toggle-switch {
    width: 44px;
    height: 24px;
    background: var(--color-toggle-off);
    border-radius: 30px;
    position: relative;
    cursor: pointer;
    transition: background 0.3s ease;
}

.toggle-switch.active { background: var(--color-toggle-on); }

.toggle-switch:after {
    content: "";
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    transition: 0.1s;
}

.toggle-switch.active:after { left: 22px; }

.countdown-timer {
    background: var(--color-bg-input-dark);
    padding: var(--padding-sm);
    border-radius: var(--radius-lg);
    font-family: monospace;
    font-weight: var(--weight-bold);
    color: var(--color-text-countdown);
    min-width: 86px;
    text-align: center;
    font-size: var(--text-sm);
    transition: background 0.3s ease, color 0.3s ease;
}

/* ============================================
   导出按钮行
   ============================================ */

.export-row {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.export-row button {
    background: var(--color-btn-primary);
    border: none;
    color: white;
    padding: var(--padding-lg);
    border-radius: 50px;
    font-weight: var(--weight-bold);
    font-size: var(--text-md);
    cursor: pointer;
    min-width: 120px;
    height: var(--height-lg);
}

/* ============================================
   桌面/移动端布局
   ============================================ */

.annotation-group-desktop { display: flex; align-items: center; gap: 8px; }
.annotation-group-mobile { display: none; }
.text-group-desktop { display: flex; }
.tuning-row-subdiv-mobile-only { display: none !important; }

.metro-group-metronome-subdiv {
    background: var(--color-border-dark);
    padding: var(--padding-lg);
    border-radius: 50px;
    display: flex;
    gap: 8px;
    align-items: center;
    color: white;
    font-weight: var(--weight-bold);
    font-size: var(--text-md);
    min-width: 140px;
    height: var(--height-lg);
}

.beat-subdiv-display, .beat-subdiv-display-fixed {
    display: flex;
    gap: 4px;
    align-items: center;
    height: 20px;
}

.beat-subdiv-display-fixed { justify-content: center; }

.beat-subdiv {
    width: 10px;
    height: 10px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    transition: background-color 0.08s ease-out, transform 0.08s ease-out, box-shadow 0.08s ease-out;
    will-change: transform, background-color;
}

.beat-subdiv.active {
    background: var(--color-text-bpm);
    transform: scale(1.3);
    box-shadow: 0 0 8px var(--color-text-bpm);
}

.beat-subdiv.accent {
    background: rgba(255,170,102,0.3);
    width: 10px;
    height: 10px;
}

.beat-subdiv.accent.active {
    background: var(--color-text-countdown);
    transform: scale(1.4);
    box-shadow: 0 0 10px var(--color-text-countdown);
}

/* ============================================
   页脚样式
   ============================================ */
.site-footer {
    text-align: center;
    padding: 20px 16px;
    width: 100%;
    max-width: 1450px;
    font-size: 13px;
    color: var(--color-text-secondary);
    opacity: 0.7;
    transition: opacity 0.2s;
    flex-shrink: 0;
}

.site-footer:hover {
    opacity: 1;
}

.site-footer a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.site-footer a:hover {
    color: var(--color-toggle-on);
}

.site-footer .divider {
    margin: 0 10px;
    opacity: 0.4;
}

/* ============================================
   响应式样式 - 移动端（使用CSS变量）
   ============================================ */

/* 移动端 - 800px以下 */
@media (max-width: 800px) {
    :root {
        /* 移动端字体大小 */
        --text-xs: 11px;
        --text-sm: 11px;
        --text-md: 11px;
        --text-lg: 12px;
        --text-xl: 14px;
        
        /* 移动端UI尺寸 */
        --height-sm: auto;
        --height-md: auto;
        --height-lg: auto;
        --height-xl: auto;
        --height-xxl: auto;
        
        /* 移动端响应式变量 */
        --body-padding: 8px;
        --container-padding: 12px 14px 16px;
        --container-radius: 20px;
        --title-input-width: 200px;
        --gen-btn-min-width: 90px;
        --range-width: 80px;
        --bpm-min-width: 46px;
    }
    
    /* 布局切换 */
    .annotation-group-desktop { display: none !important; }
    .annotation-group-mobile { display: flex !important; flex-wrap: nowrap; align-items: center; }
    .text-group-desktop { display: none !important; }
    .tuning-row .metro-group-metronome-subdiv { display: none !important; }
    .tuning-row-subdiv-mobile-only { display: flex !important; justify-content: center; margin-bottom: 8px; }
    .tuning-row-subdiv-mobile-only .metro-group-metronome-subdiv { width: 100%; justify-content: center; display: flex !important; }
    
    .small-text-input { width: 60px; }
    
    body { padding: var(--body-padding); }
    .container { padding: var(--container-padding); border-radius: var(--container-radius); }
    .title-bar { padding: 6px 14px; gap: 8px; flex-wrap: nowrap; }
    .title-bar label { font-size: var(--text-lg); }
    #boardTitle { width: var(--title-input-width); font-size: var(--text-lg); padding: 5px 10px; flex: 1; min-width: 0; }
    .tuning-panel.open { padding: 10px 12px; max-height: 300px; }
    .tuning-group { padding: 4px 10px; gap: 6px; height: var(--height-lg); flex-wrap: wrap; }
    .tuning-group label { font-size: var(--text-md); }
    .tuning-group select { padding: 4px 8px; font-size: var(--text-md); min-width: 48px; height: var(--height-sm); }
    .tuning-preset select { min-width: 140px; font-size: var(--text-md); height: var(--height-sm); }
    .main-panel { padding: 10px 14px; border-radius: 36px; }
    .param-row { gap: 8px; margin-bottom: 10px; flex-wrap: nowrap; }
    .param-group { padding: 4px 8px; gap: 4px; height: var(--height-lg); }
    .param-group label { font-size: var(--text-md); }
    .param-group select { padding: 3px 6px; font-size: 10px; height: var(--height-sm); }
    .param-group-tall { height: var(--height-xxl); }
    .param-group-tall select { height: var(--height-sm); }
    #scaleModeSelect { font-size: 9px; }
    .gen-btn { padding: 6px 14px; font-size: var(--text-md); min-width: var(--gen-btn-min-width); height: var(--height-lg); }
    .tuning-toggle { padding: 6px 14px; font-size: var(--text-md); min-width: var(--gen-btn-min-width); height: var(--height-lg); }
    .metro-group-metronome-subdiv { padding: 6px 14px; font-size: var(--text-md); min-width: var(--gen-btn-min-width); height: var(--height-lg); }
    .tool-group { padding: 4px 10px; gap: 6px; height: var(--height-lg); }
    .tool-group-tall { height: var(--height-xxl); }
    .tool-group-label { font-size: var(--text-md); }
    .mode-btn { padding: 4px 10px; font-size: var(--text-md); height: var(--height-sm); }
    .color-btn { width: 28px; height: 28px; border-radius: 10px; }
    .color-preset { padding: 3px 8px; gap: 6px; height: var(--height-sm); }
    input[type="color"] { width: 38px; height: 32px; }
    .metro-group select { padding: 4px 8px; font-size: var(--text-md); height: var(--height-sm); }
    .metronome-panel { padding: 8px 12px; gap: 8px; }
    .metro-group { padding: 3px 8px; gap: 4px; height: var(--height-lg); }
    .metro-label { font-size: 10px; }
    .bpm-value { font-size: var(--text-xl); min-width: var(--bpm-min-width); padding: 2px 6px; }
    input[type="range"] { width: var(--range-width); }
    .metro-btn { padding: 3px 8px; font-size: 10px; height: var(--height-sm); }
    .countdown-timer { font-size: var(--text-md); min-width: 60px; }
    .export-row { gap: 8px; margin-top: 12px; }
    .export-row button { padding: 4px 10px; font-size: var(--text-md); height: var(--height-sm); }
    input[type="text"], input[type="number"] { padding: 4px 8px; font-size: var(--text-md); height: var(--height-sm); }
    .beat-subdiv { width: 6px; height: 6px; }
    .beat-subdiv.accent { width: 10px; height: 10px; }
}

/* 小屏幕 - 500px以下 */
@media (max-width: 500px) {
    :root {
        --text-md: 10px;
        --title-input-width: 140px;
    }
    .param-row { gap: 6px; flex-wrap: nowrap; }
    .param-group { padding: 3px 6px; gap: 3px; }
    .param-group-tall { height: var(--height-xxl); }
    .param-group label { font-size: var(--text-md); }
    .param-group select { padding: 2px 4px; font-size: 9px; }
    #scaleModeSelect { font-size: 8px; }
    .title-bar { gap: 6px; padding: 4px 10px; }
    .title-bar label { font-size: var(--text-lg); }
    #boardTitle { width: var(--title-input-width); font-size: var(--text-lg); padding: 4px 8px; }
    .toolbar { gap: 6px; }
    .tool-group-tall { height: var(--height-xxl); }
    .metronome-panel { border-radius: 36px; }
    .lang-toggle, .theme-toggle { height: 28px; padding: 3px 8px; font-size: var(--text-lg); min-width: 40px; }
}

/* 超小屏幕 - 400px以下 */
@media (max-width: 400px) {
    :root {
        --text-md: 9px;
        --text-lg: 10px;
        --title-input-width: 100px;
    }
    .param-row { gap: 4px; flex-wrap: nowrap; }
    .param-group { padding: 2px 4px; gap: 2px; }
    .param-group label { font-size: var(--text-md); }
    .param-group select { padding: 2px 3px; font-size: 8px; }
    #scaleModeSelect { font-size: 7px; }
    .title-bar { gap: 4px; padding: 4px 8px; }
    .title-bar label { font-size: var(--text-lg); }
    #boardTitle { width: var(--title-input-width); font-size: var(--text-lg); padding: 3px 6px; }
    .lang-toggle, .theme-toggle { height: 26px; padding: 2px 6px; font-size: var(--text-lg); min-width: 36px; }
}