/* ============================================
   MQ Music - 现代音乐播放器样式系统
   ============================================ */

/* ========== 设计令牌 ========== */
:root {
    /* 颜色系统 */
    --color-bg: #0a0a0a;
    --color-surface: rgba(255, 255, 255, 0.03);
    --color-surface-hover: rgba(255, 255, 255, 0.06);
    --color-surface-active: rgba(255, 255, 255, 0.1);
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-light: rgba(255, 255, 255, 0.12);
    
    --color-text-primary: #ffffff;
    --color-text-secondary: rgba(255, 255, 255, 0.6);
    --color-text-tertiary: rgba(255, 255, 255, 0.35);
    
    --color-accent: #3b82f6;
    --color-accent-light: #60a5fa;
    --color-accent-glow: rgba(59, 130, 246, 0.4);
    
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* 字体 */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    
    /* 间距 */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.35);
    --shadow-glow: 0 0 40px rgba(59, 130, 246, 0.3);
    
    /* 动画 */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
    --duration-fast: 0.15s;
    --duration-normal: 0.3s;
    --duration-slow: 0.5s;
    
    /* 布局 */
    --header-height: 64px;
    --nav-height: 72px;
    --panel-width: 380px;
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
}

/* ========== 基础重置 ========== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.5;
    overflow: hidden;
    height: 100vh;
    height: 100dvh;
}

button {
    font-family: inherit;
    border: none;
    background: none;
    cursor: pointer;
    color: inherit;
    font-size: inherit;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    cursor: pointer;
}

/* ========== 应用容器 ========== */
#app {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

/* ========== 背景层 ========== */
#bg-layer {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

#bg-cover {
    position: absolute;
    top: -25%;
    left: -25%;
    width: 150%;
    height: 150%;
    background-size: cover;
    background-position: center;
    filter: blur(100px) saturate(1.3);
    transform: scale(1.1);
    transition: background-image 1.5s var(--ease-out);
}

#bg-overlay {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 60% at 50% 0%, transparent 0%, rgba(0,0,0,0.3) 100%),
        radial-gradient(ellipse 60% 80% at 50% 100%, transparent 0%, rgba(0,0,0,0.5) 100%),
        linear-gradient(180deg, rgba(0,0,0,0.2) 0%, rgba(0,0,0,0.6) 100%);
}

/* ========== 主播放器容器 ========== */
#player {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr var(--panel-width);
    gap: var(--space-lg);
    height: 100%;
    padding: var(--space-xl);
    padding-right: var(--space-lg);
    opacity: 0;
    animation: fadeIn 0.8s var(--ease-out) 0.3s forwards;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

/* ========== 左侧主区域 ========== */
#player-main {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
    min-width: 0;
    padding-top: 20px;
}

/* ========== 封面区域 ========== */
#cover-section {
    position: relative;
    width: 100%;
    max-width: 440px;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

#cover-container {
    position: relative;
    width: 85%;
    height: 85%;
    border-radius: var(--radius-xl);
    overflow: visible;
}

#cover-glow {
    position: absolute;
    inset: -20%;
    background: inherit;
    filter: blur(60px) opacity(0.5);
    border-radius: 50%;
    z-index: -1;
    transition: opacity 0.5s var(--ease-out);
}

#cover-art {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: var(--radius-xl);
    box-shadow: 
        0 25px 60px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 255, 255, 0.1) inset;
    transition: transform 0.6s var(--ease-out), box-shadow 0.6s var(--ease-out);
}

#cover-container:hover #cover-art {
    transform: scale(1.02);
    box-shadow: 
        0 30px 70px rgba(0, 0, 0, 0.6),
        0 0 0 1px rgba(255, 255, 255, 0.15) inset;
}

#cover-container.playing #cover-art {
    animation: coverPulse 8s ease-in-out infinite;
    box-shadow: 
        0 25px 60px rgba(0, 0, 0, 0.5),
        0 0 80px rgba(59, 130, 246, 0.15);
}

@keyframes coverPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.03); }
}

#cover-reflection {
    position: absolute;
    top: 100%;
    left: 5%;
    width: 90%;
    height: 40%;
    background: linear-gradient(to bottom, rgba(255,255,255,0.1), transparent);
    filter: blur(20px);
    opacity: 0.3;
    transform: scaleY(-1);
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    pointer-events: none;
}

/* ========== 歌曲信息 ========== */
#track-info {
    text-align: center;
    max-width: 400px;
}

#track-title {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

#track-artist {
    font-size: 1rem;
    color: var(--color-text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ========== 进度条 ========== */
#progress-section {
    width: 100%;
    max-width: 420px;
}

#progress-bar {
    position: relative;
    width: 100%;
    height: 6px;
    background: var(--color-surface-active);
    border-radius: var(--radius-full);
    cursor: pointer;
    overflow: visible;
    transition: height 0.2s var(--ease-out);
}

#progress-bar:hover {
    height: 8px;
}

#progress-buffer {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
    width: 0%;
    transition: width 0.3s var(--ease-out);
    pointer-events: none;
}

#progress-fill {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
    border-radius: var(--radius-full);
    width: 0%;
    pointer-events: none;
    z-index: 1;
}

#progress-slider {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    transform: translateY(-50%);
    -webkit-appearance: none;
    appearance: none;
    background: transparent;
    cursor: pointer;
    z-index: 2;
    height: 20px;
    margin: 0;
}

#progress-slider::-webkit-slider-runnable-track {
    height: 6px;
    background: transparent;
    border-radius: var(--radius-full);
}

#progress-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--color-text-primary);
    border-radius: 50%;
    margin-top: -4px;
    box-shadow: var(--shadow-md);
    opacity: 0;
    transition: opacity 0.2s var(--ease-out), transform 0.2s var(--ease-out);
    transform: scale(0.8);
}

#progress-bar:hover #progress-slider::-webkit-slider-thumb {
    opacity: 1;
    transform: scale(1);
}

#progress-slider::-moz-range-track {
    height: 6px;
    background: transparent;
    border-radius: var(--radius-full);
}

#progress-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    background: var(--color-text-primary);
    border-radius: 50%;
    border: none;
    box-shadow: var(--shadow-md);
    opacity: 0;
    transition: opacity 0.2s var(--ease-out), transform 0.2s var(--ease-out);
    transform: scale(0.8);
}

#progress-bar:hover #progress-slider::-moz-range-thumb {
    opacity: 1;
    transform: scale(1);
}

#time-display {
    display: flex;
    justify-content: space-between;
    margin-top: var(--space-sm);
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--color-text-tertiary);
}

/* ========== 主控制按钮 ========== */
#controls-main {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.control-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    background: transparent;
    transition: all 0.25s var(--ease-out);
    position: relative;
}

.control-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    background: var(--color-surface-hover);
    opacity: 0;
    transition: opacity 0.25s var(--ease-out);
}

.control-btn:hover {
    color: var(--color-text-primary);
}

.control-btn:hover::before {
    opacity: 1;
}

.control-btn:active {
    transform: scale(0.92);
}

.control-btn.active {
    /* 播放模式按钮的 active 只表示功能状态，不显示背景 */
}

/* 按钮临时 active 状态（点击后显示，2秒后自动消失） */
.control-btn.btn-temp-active,
.nav-btn.btn-temp-active,
.panel-tab.btn-temp-active {
    background: var(--color-surface-active);
}

.control-btn.play-btn {
    width: 64px;
    height: 64px;
    font-size: 1.4rem;
    background: linear-gradient(135deg, #ffffff 0%, #e0e0e0 100%);
    color: var(--color-bg);
    box-shadow: 
        0 8px 30px rgba(255,255,255,0.2),
        0 0 0 1px rgba(255,255,255,0.3) inset;
}

.control-btn.play-btn::before {
    display: none;
}

.control-btn.play-btn:hover {
    transform: scale(1.08);
    box-shadow: 
        0 12px 40px rgba(255,255,255,0.3),
        0 0 60px rgba(59, 130, 246, 0.2);
}

.control-btn.play-btn:active {
    transform: scale(1);
}

/* 音量控制 - PC端在主控制栏 */
.control-btn-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

#volume-control {
    position: relative;
    display: flex;
    align-items: center;
}

#volume-slider-wrap {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    width: 36px;
    height: 120px;
    background: rgba(30, 30, 30, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-lg);
    padding: var(--space-md) var(--space-sm);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s var(--ease-out);
    z-index: 100;
}

/* PC端 hover 显示 */
@media (hover: hover) and (pointer: fine) {
    #volume-control:hover #volume-slider-wrap,
    #volume-slider-wrap:hover {
        opacity: 1;
        visibility: visible;
    }
}

/* 点击激活显示（移动端和PC端都支持） */
#volume-control.active #volume-slider-wrap {
    opacity: 1;
    visibility: visible;
}

/* 音量图标动态样式 */
#volume-icon {
    transition: transform 0.2s var(--ease-out);
}

#volume-icon .volume-wave {
    transition: opacity 0.15s var(--ease-out), transform 0.15s var(--ease-out);
    transform-origin: 8px 12px;
    opacity: 0;
}

/* 音量 > 0: 显示第一层声波 */
#volume-icon[data-level="1"] .wave-1,
#volume-icon[data-level="2"] .wave-1,
#volume-icon[data-level="3"] .wave-1 {
    opacity: 1;
}

/* 音量 > 33%: 显示第二层声波 */
#volume-icon[data-level="2"] .wave-2,
#volume-icon[data-level="3"] .wave-2 {
    opacity: 1;
}

/* 音量 > 66%: 显示第三层声波 */
#volume-icon[data-level="3"] .wave-3 {
    opacity: 1;
}

/* 静音时显示斜线 */
#volume-icon.muted .volume-mute-line {
    opacity: 1;
}

#volume-icon .volume-mute-line {
    opacity: 0;
    transition: opacity 0.15s var(--ease-out);
}

/* 静音时隐藏所有声波 */
#volume-icon.muted .volume-wave {
    opacity: 0;
}

#volume-slider-wrap {
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    width: 36px;
    height: 120px;
    background: rgba(30, 30, 30, 0.95);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-lg);
    padding: var(--space-md) var(--space-sm);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s var(--ease-out);
}

#volume-control:hover #volume-slider-wrap,
#volume-slider-wrap:hover {
    opacity: 1;
    visibility: visible;
}

#volume-slider {
    width: 100%;
    height: 100%;
    writing-mode: vertical-lr;
    direction: rtl;
}

#volume-slider::-webkit-slider-runnable-track {
    width: 4px;
    height: 100%;
    background: var(--color-surface-active);
    border-radius: var(--radius-full);
}

#volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--color-text-primary);
    border-radius: 50%;
    margin-left: -5px;
    box-shadow: var(--shadow-sm);
}

#volume-fill {
    position: absolute;
    bottom: var(--space-md);
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 80%;
    background: linear-gradient(to top, var(--color-accent), transparent);
    border-radius: var(--radius-full);
    pointer-events: none;
    opacity: 0.5;
}

/* ========== 右侧面板 ========== */
#player-panel {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

#panel-tabs {
    display: flex;
    gap: var(--space-xs);
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

.panel-tab {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-tertiary);
    transition: all 0.2s var(--ease-out);
}

.panel-tab:hover {
    color: var(--color-text-secondary);
    background: var(--color-surface-hover);
}

.panel-tab.active {
    color: var(--color-text-primary);
    background: var(--color-surface-active);
}

.panel-tab i {
    font-size: 1rem;
}

.panel-content {
    display: none;
    flex: 1;
    overflow: hidden;
}

.panel-content.active {
    display: flex;
    flex-direction: column;
}

/* ========== 歌词面板 ========== */
#lyrics-scroll {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    scroll-behavior: smooth;
    mask-image: linear-gradient(to bottom, transparent 0%, black 10%, black 90%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 10%, black 90%, transparent 100%);
}

#lyrics-scroll::-webkit-scrollbar {
    width: 4px;
}

#lyrics-scroll::-webkit-scrollbar-track {
    background: transparent;
}

#lyrics-scroll::-webkit-scrollbar-thumb {
    background: var(--color-border-light);
    border-radius: var(--radius-full);
}

#lyrics-container {
    padding: 50vh 0;
    text-align: center;
}

.lyric-line {
    padding: var(--space-sm) var(--space-lg);
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 2;
    cursor: pointer;
    transition: all 0.5s var(--ease-out);
    transform: scale(0.95) translateY(2px);
    filter: blur(0.5px);
    opacity: 0.7;
}

.lyric-line:hover {
    color: var(--color-text-primary);
    opacity: 0.85;
}

.lyric-line.active {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text-primary);
    transform: scale(1) translateY(0);
    filter: blur(0);
    opacity: 1;
    text-shadow: 0 0 40px rgba(255, 255, 255, 0.4), 0 0 80px rgba(59, 130, 246, 0.2);
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.05), transparent);
    border-radius: var(--radius-md);
}

.lyric-line .word {
    display: inline-block;
    transition: all 0.2s var(--ease-out);
}

.lyric-line .word.active {
    color: var(--color-accent-light);
    text-shadow: 0 0 20px var(--color-accent-glow);
}

.lyric-placeholder {
    padding: var(--space-xl);
    color: var(--color-text-tertiary);
    font-style: italic;
}

/* ========== 播放列表面板 ========== */
#queue-search {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

#queue-search i {
    color: var(--color-text-tertiary);
    font-size: 0.9rem;
}

#queue-search-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--color-text-primary);
    font-size: 0.9rem;
    padding: var(--space-xs) 0;
}

#queue-search-input::placeholder {
    color: var(--color-text-tertiary);
}

#queue-header {
    display: flex;
    align-items: center;
    padding: var(--space-sm) var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}

#queue-count {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

#queue-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-sm);
}

.queue-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s var(--ease-out);
}

.queue-item:hover {
    background: var(--color-surface-hover);
}

.queue-item.active {
    background: var(--color-surface-active);
}

.queue-item.active .queue-item-title {
    color: var(--color-accent);
}

.queue-item-index {
    width: 24px;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--color-text-tertiary);
    text-align: center;
}

.queue-item-cover-wrap {
    position: relative;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.queue-item-cover {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.3s var(--ease-out);
}

.queue-item-cover-placeholder {
    font-size: 18px;
    color: var(--color-text-tertiary);
    opacity: 0.5;
}

.queue-item-info {
    flex: 1;
    min-width: 0;
}

.queue-item-title {
    font-size: 0.9rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.queue-item-artist {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ========== 移动端底部导航 ========== */
#mobile-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: calc(var(--nav-height) + var(--safe-area-bottom));
    padding-bottom: var(--safe-area-bottom);
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--color-border);
    z-index: 100;
}

.nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    flex: 1;
    height: 100%;
    color: var(--color-text-tertiary);
    font-size: 0.7rem;
    transition: color 0.2s var(--ease-out);
}

.nav-btn i {
    font-size: 1.25rem;
}

.nav-btn.active {
    color: var(--color-accent);
}

/* ========== 移动端全屏歌词 ========== */
#mobile-lyrics-view {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 200;
    background: var(--color-bg);
    flex-direction: column;
    transform: translateY(100%);
    transition: transform 0.4s var(--ease-out);
}

#mobile-lyrics-view.active {
    transform: translateY(0);
}

#mobile-lyrics-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    padding-top: max(var(--space-md), env(safe-area-inset-top));
}

#btn-close-lyrics {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    font-size: 1.25rem;
}

#mobile-track-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

#mobile-track-title {
    font-size: 1rem;
    font-weight: 600;
}

#mobile-track-artist {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
}

#mobile-lyrics-scroll {
    flex: 1;
    overflow-y: auto;
    mask-image: linear-gradient(to bottom, transparent 0%, black 5%, black 95%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 5%, black 95%, transparent 100%);
}

#mobile-lyrics-container {
    padding: 40vh 0;
    text-align: center;
    min-height: 100%;
}

/* ========== 移动端播放列表抽屉 ========== */
#mobile-queue-drawer {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 300;
    background: var(--color-bg);
    flex-direction: column;
    transform: translateY(100%);
    transition: transform 0.4s var(--ease-out);
}

#mobile-queue-drawer.active {
    display: flex;
    transform: translateY(0);
}

#mobile-queue-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    padding-top: max(var(--space-md), env(safe-area-inset-top));
    border-bottom: 1px solid var(--color-border);
}

#mobile-queue-header span {
    font-size: 1.1rem;
    font-weight: 600;
}

#btn-close-queue {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    font-size: 1.25rem;
}

#mobile-queue-search {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

#mobile-queue-search i {
    color: var(--color-text-tertiary);
    font-size: 0.9rem;
}

#mobile-queue-search input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--color-text-primary);
    font-size: 0.9rem;
    padding: var(--space-xs) 0;
}

#mobile-queue-search input::placeholder {
    color: var(--color-text-tertiary);
}

#mobile-queue-list {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-sm);
}

#mobile-lyrics-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-xl);
    padding: var(--space-xl);
    padding-bottom: max(var(--space-xl), calc(var(--safe-area-bottom) + var(--space-lg)));
}

#mobile-lyrics-controls button {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    transition: all 0.2s var(--ease-out);
}

#mobile-lyrics-controls button:hover {
    color: var(--color-text-primary);
}

#mobile-btn-play {
    width: 72px !important;
    height: 72px !important;
    background: var(--color-text-primary);
    color: var(--color-bg) !important;
    font-size: 1.5rem !important;
}

/* ========== 加载遮罩 ========== */
#loading-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s var(--ease-out);
}

#loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loader {
    position: relative;
    width: 60px;
    height: 60px;
}

.loader-ring {
    position: absolute;
    inset: 0;
    border: 2px solid transparent;
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loader-ring:nth-child(2) {
    inset: 8px;
    border-top-color: var(--color-accent-light);
    animation-duration: 0.8s;
    animation-direction: reverse;
}

.loader-ring:nth-child(3) {
    inset: 16px;
    border-top-color: var(--color-text-tertiary);
    animation-duration: 0.6s;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ========== 响应式：平板 ========== */
@media (max-width: 1024px) {
    :root {
        --panel-width: 340px;
    }
    
    #player {
        padding: var(--space-lg);
    }
}

/* ========== 响应式：移动端 ========== */
@media (max-width: 768px) {
    :root {
        --nav-height: 64px;
    }
    
    #player {
        display: flex;
        flex-direction: column;
        padding: var(--space-md);
        padding-bottom: calc(var(--nav-height) + var(--safe-area-bottom) + var(--space-md));
    }
    
    #player-main {
        gap: var(--space-md);
        padding-top: 16px;
    }
    
    #cover-section {
        max-width: 300px;
    }
    
    #track-title {
        font-size: 1.25rem;
    }
    
    #track-artist {
        font-size: 0.9rem;
    }
    
    #progress-section {
        max-width: 100%;
    }
    
    #controls-main {
        gap: var(--space-sm);
    }
    
    .control-btn {
        width: 44px;
        height: 44px;
        font-size: 1rem;
    }
    
    .control-btn.play-btn {
        width: 56px;
        height: 56px;
        font-size: 1.25rem;
    }
    
    #player-panel {
        display: none;
    }
    
    #mobile-nav {
        display: flex;
    }
    
    #mobile-lyrics-view {
        display: flex;
    }
}

/* ========== 响应式：小屏手机 ========== */
@media (max-width: 420px) {
    #player {
        padding: var(--space-sm);
        padding-bottom: calc(var(--nav-height) + var(--safe-area-bottom) + var(--space-sm));
    }
    
    #cover-section {
        max-width: 240px;
    }
    
    #track-title {
        font-size: 1.1rem;
    }
    
    #track-artist {
        font-size: 0.85rem;
    }
    
    .control-btn {
        width: 40px;
        height: 40px;
    }
    
    .control-btn.play-btn {
        width: 52px;
        height: 52px;
    }
}

/* ========== 横屏移动端 ========== */
@media (max-height: 500px) and (orientation: landscape) {
    #player {
        flex-direction: row;
        gap: var(--space-lg);
    }
    
    #player-main {
        flex: 0 0 auto;
        width: 50%;
        max-width: 360px;
    }
    
    #cover-section {
        max-width: 180px;
    }
    
    #player-panel {
        display: flex;
        flex: 1;
    }
    
    #mobile-nav {
        display: none;
    }
}

/* ========== 深色模式优化 ========== */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #000000;
    }
}

/* ========== 减少动画 ========== */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}