/* ============================================
   汽水音乐 - 全新设计系统
   汽水蓝绿渐变 + 深色主题
   ============================================ */

:root {
    --primary: #00d4aa;
    --primary-light: #00f0c0;
    --primary-dark: #00b894;
    --secondary: #0984e3;
    --accent: #fd79a8;
    --accent-warm: #fdcb6e;
    --bg-dark: #0b0e17;
    --bg-darker: #060810;
    --bg-card: rgba(0, 212, 170, 0.06);
    --bg-card-hover: rgba(0, 212, 170, 0.12);
    --bg-glass: rgba(255, 255, 255, 0.04);
    --bg-glass-strong: rgba(255, 255, 255, 0.08);
    --text-primary: #f0f0f5;
    --text-secondary: rgba(240, 240, 245, 0.55);
    --text-muted: rgba(240, 240, 245, 0.35);
    --border-color: rgba(0, 212, 170, 0.12);
    --border-color-hover: rgba(0, 212, 170, 0.3);
    --gradient-primary: linear-gradient(135deg, #00d4aa, #0984e3);
    --gradient-warm: linear-gradient(135deg, #fd79a8, #fdcb6e);
    --gradient-cool: linear-gradient(135deg, #00d4aa, #6c5ce7);
    --shadow-primary: 0 8px 32px rgba(0, 212, 170, 0.25);
    --shadow-primary-lg: 0 16px 48px rgba(0, 212, 170, 0.35);
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    min-height: 100vh;
    color: var(--text-primary);
    background: var(--bg-dark);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   动态背景
   ============================================ */
.bg-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.35;
    animation: orbFloat 25s ease-in-out infinite;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary), transparent 70%);
    top: -200px;
    right: -150px;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--secondary), transparent 70%);
    bottom: -150px;
    left: -150px;
    animation-delay: -8s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, var(--accent), transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.2;
    animation-delay: -16s;
}

@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(40px, -40px) scale(1.08); }
    50% { transform: translate(-30px, 30px) scale(0.94); }
    75% { transform: translate(30px, 40px) scale(1.04); }
}

.music-notes {
    position: absolute;
    width: 100%;
    height: 100%;
}

.note {
    position: absolute;
    font-size: 20px;
    color: var(--primary);
    opacity: 0.15;
    animation: noteFloat 10s ease-in-out infinite;
}

.note-1 { left: 8%; top: 15%; animation-delay: 0s; }
.note-2 { left: 25%; top: 55%; animation-delay: -2.5s; }
.note-3 { left: 72%; top: 25%; animation-delay: -5s; }
.note-4 { left: 88%; top: 65%; animation-delay: -7.5s; }

@keyframes noteFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); opacity: 0.15; }
    50% { transform: translateY(-25px) rotate(12deg); opacity: 0.35; }
}

/* 网格背景 */
.bg-effects::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0, 212, 170, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 170, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0;
    background: rgba(11, 14, 23, 0.7);
    backdrop-filter: blur(24px) saturate(1.4);
    -webkit-backdrop-filter: blur(24px) saturate(1.4);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(11, 14, 23, 0.92);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
    height: 64px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.03);
}

.logo-icon {
    font-size: 28px;
    filter: drop-shadow(0 0 12px rgba(0, 212, 170, 0.5));
}

.logo-text {
    font-size: 22px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 8px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover {
    color: var(--text-primary);
    background: var(--bg-glass-strong);
}

.nav-links a.active {
    color: var(--primary);
    background: var(--bg-card);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}

/* ============================================
   首页 Hero
   ============================================ */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 32px 60px;
    position: relative;
    z-index: 1;
}

.hero-content {
    text-align: center;
    max-width: 860px;
}

/* 唱片动画 */
.music-visual {
    position: relative;
    width: 220px;
    height: 220px;
    margin: 0 auto 40px;
}

.vinyl-disc {
    width: 180px;
    height: 180px;
    margin: 0 auto;
    background: conic-gradient(
        from 0deg,
        #1a1a2e, #16213e, #1a1a2e, #0f3460,
        #1a1a2e, #16213e, #1a1a2e, #0f3460,
        #1a1a2e, #16213e, #1a1a2e, #0f3460,
        #1a1a2e
    );
    border-radius: 50%;
    position: relative;
    animation: vinylSpin 10s linear infinite;
    box-shadow:
        0 0 0 3px rgba(0, 212, 170, 0.15),
        0 0 60px rgba(0, 212, 170, 0.2),
        inset 0 0 30px rgba(0, 0, 0, 0.5);
}

.vinyl-disc::before {
    content: '';
    position: absolute;
    inset: 15px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.vinyl-disc::after {
    content: '';
    position: absolute;
    inset: 35px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.04);
}

@keyframes vinylSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.disc-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 56px;
    height: 56px;
    background: var(--gradient-primary);
    border-radius: 50%;
    border: 3px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 0 20px rgba(0, 212, 170, 0.4);
}

.disc-label {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 26px;
    z-index: 2;
}

/* 均衡器 */
.equalizer {
    display: flex;
    justify-content: center;
    align-items: flex-end;
    gap: 5px;
    height: 50px;
    margin-top: -15px;
}

.bar {
    width: 7px;
    background: var(--gradient-primary);
    border-radius: 4px;
    animation: eqBounce 0.9s ease-in-out infinite;
    opacity: 0.85;
}

.bar-1 { height: 28px; animation-delay: 0s; }
.bar-2 { height: 44px; animation-delay: 0.12s; }
.bar-3 { height: 36px; animation-delay: 0.24s; }
.bar-4 { height: 52px; animation-delay: 0.36s; }
.bar-5 { height: 32px; animation-delay: 0.48s; }

@keyframes eqBounce {
    0%, 100% { transform: scaleY(1); opacity: 0.85; }
    50% { transform: scaleY(0.4); opacity: 0.5; }
}

/* 标题 */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 18px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 13px;
    color: var(--primary);
    margin-bottom: 24px;
    font-weight: 500;
}

.hero-badge .badge-dot {
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
    font-size: 72px;
    font-weight: 900;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -2px;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-weight: 400;
    letter-spacing: 2px;
}

.hero-desc {
    font-size: 17px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 44px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.hero-desc strong {
    color: var(--primary);
    font-weight: 600;
}

.hero-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ============================================
   按钮系统
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 36px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.15), transparent);
    opacity: 0;
    transition: var(--transition);
}

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

.btn-primary {
    background: var(--gradient-primary);
    color: #0b0e17;
    box-shadow: var(--shadow-primary);
    font-weight: 700;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-primary-lg);
}

.btn-ghost {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(12px);
}

.btn-ghost:hover {
    border-color: var(--border-color-hover);
    background: var(--bg-card);
    transform: translateY(-2px);
}

.btn-icon, .download-icon {
    width: 20px;
    height: 20px;
}

/* ============================================
   数据统计
   ============================================ */
.stats-section {
    padding: 40px 32px 80px;
    position: relative;
    z-index: 1;
}

.stats-grid {
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.stat-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-color-hover);
    box-shadow: 0 12px 40px rgba(0, 212, 170, 0.12);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-icon {
    font-size: 32px;
    margin-bottom: 14px;
    display: block;
}

.stat-value {
    font-size: 38px;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline;
    letter-spacing: -1px;
}

.stat-unit {
    font-size: 18px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 13px;
    margin-top: 8px;
    font-weight: 500;
    letter-spacing: 0.5px;
}

/* ============================================
   核心优势
   ============================================ */
.features-section {
    padding: 100px 32px;
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 12px;
    color: var(--primary);
    margin-bottom: 16px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.section-title {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 16px;
    max-width: 480px;
    margin: 0 auto;
    line-height: 1.7;
}

.features-grid {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.feature-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--border-color-hover);
    box-shadow: 0 20px 60px rgba(0, 212, 170, 0.1);
}

.feature-card:hover::after {
    width: 60%;
}

.feature-icon-wrap {
    width: 56px;
    height: 56px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: 20px;
    transition: var(--transition);
}

.feature-card:hover .feature-icon-wrap {
    background: var(--bg-card-hover);
    border-color: var(--border-color-hover);
    transform: scale(1.08);
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.75;
}

/* ============================================
   体验展示区
   ============================================ */
.showcase-section {
    padding: 80px 32px;
    position: relative;
    z-index: 1;
}

.showcase-grid {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.showcase-card {
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.showcase-card.large {
    grid-row: span 2;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.showcase-card:hover {
    border-color: var(--border-color-hover);
    transform: translateY(-4px);
}

.showcase-card .card-number {
    font-size: 80px;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.15;
    line-height: 1;
    margin-bottom: 16px;
}

.showcase-card h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
}

.showcase-card p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.75;
}

.showcase-card .card-visual {
    margin-top: 32px;
    display: flex;
    gap: 8px;
    align-items: flex-end;
    height: 80px;
}

.showcase-card .visual-bar {
    flex: 1;
    background: var(--gradient-primary);
    border-radius: 6px 6px 0 0;
    opacity: 0.6;
    animation: showcaseEq 1.2s ease-in-out infinite;
}

.showcase-card .visual-bar:nth-child(1) { height: 40%; animation-delay: 0s; }
.showcase-card .visual-bar:nth-child(2) { height: 70%; animation-delay: 0.1s; }
.showcase-card .visual-bar:nth-child(3) { height: 55%; animation-delay: 0.2s; }
.showcase-card .visual-bar:nth-child(4) { height: 85%; animation-delay: 0.3s; }
.showcase-card .visual-bar:nth-child(5) { height: 45%; animation-delay: 0.4s; }
.showcase-card .visual-bar:nth-child(6) { height: 65%; animation-delay: 0.5s; }
.showcase-card .visual-bar:nth-child(7) { height: 35%; animation-delay: 0.6s; }
.showcase-card .visual-bar:nth-child(8) { height: 75%; animation-delay: 0.7s; }

@keyframes showcaseEq {
    0%, 100% { transform: scaleY(1); }
    50% { transform: scaleY(0.5); }
}

.showcase-card .wave-line {
    margin-top: 32px;
    height: 60px;
    position: relative;
    overflow: hidden;
}

.showcase-card .wave-line svg {
    width: 100%;
    height: 100%;
}

/* ============================================
   CTA 区域
   ============================================ */
.cta-section {
    padding: 100px 32px;
    position: relative;
    z-index: 1;
}

.cta-box {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.08), rgba(9, 132, 227, 0.08));
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 80px 60px;
    position: relative;
    overflow: hidden;
}

.cta-box::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 212, 170, 0.06), transparent 50%);
    animation: ctaGlow 8s ease-in-out infinite;
}

@keyframes ctaGlow {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(5%, 5%); }
}

.cta-box h2 {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 16px;
    position: relative;
    background: linear-gradient(135deg, var(--text-primary), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta-box p {
    color: var(--text-secondary);
    font-size: 17px;
    margin-bottom: 36px;
    position: relative;
    line-height: 1.7;
}

.cta-box .hero-btns {
    position: relative;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 48px 32px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    position: relative;
    z-index: 1;
}

.footer-content {
    max-width: 1280px;
    margin: 0 auto;
}

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

.footer-logo {
    font-size: 20px;
    filter: drop-shadow(0 0 8px rgba(0, 212, 170, 0.3));
}

.footer-brand {
    font-size: 18px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-bottom: 24px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary);
}

.footer-copy {
    color: var(--text-muted);
    font-size: 13px;
}

.footer-desc {
    margin-top: 6px;
    color: var(--text-muted);
    font-size: 12px;
}

/* ============================================
   下载页
   ============================================ */
.download-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 32px 60px;
    position: relative;
    z-index: 1;
}

.download-container {
    max-width: 640px;
    width: 100%;
}

.download-card {
    background: var(--bg-glass);
    backdrop-filter: blur(24px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 52px 48px;
    position: relative;
    overflow: hidden;
}

.download-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
}

.app-info {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 36px;
}

.app-icon {
    position: relative;
    width: 96px;
    height: 96px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.vinyl-mini {
    width: 80px;
    height: 80px;
    background: conic-gradient(
        from 0deg,
        #1a1a2e, #16213e, #1a1a2e, #0f3460,
        #1a1a2e, #16213e, #1a1a2e
    );
    border-radius: 50%;
    position: relative;
    animation: vinylSpin 10s linear infinite;
    box-shadow:
        0 0 0 2px rgba(0, 212, 170, 0.15),
        0 0 40px rgba(0, 212, 170, 0.2);
}

.vinyl-mini .disc-center {
    width: 24px;
    height: 24px;
}

.vinyl-mini .disc-label {
    font-size: 14px;
}

.pulse-rings {
    position: absolute;
    inset: -15px;
}

.pulse-ring {
    position: absolute;
    inset: 0;
    border: 1.5px solid var(--primary);
    border-radius: 50%;
    opacity: 0;
    animation: ringPulse 2.5s ease-out infinite;
}

.pulse-ring:nth-child(2) { animation-delay: 1.25s; }

@keyframes ringPulse {
    0% { transform: scale(0.85); opacity: 0.6; }
    100% { transform: scale(1.6); opacity: 0; }
}

.app-details h1 {
    font-size: 30px;
    font-weight: 800;
    margin-bottom: 6px;
    letter-spacing: -0.5px;
}

.app-desc {
    color: var(--text-secondary);
    font-size: 14px;
}

.app-version {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    padding: 20px;
    background: rgba(0, 0, 0, 0.25);
    border-radius: var(--radius-md);
    margin-bottom: 28px;
    border: 1px solid rgba(255, 255, 255, 0.03);
}

.version-item {
    text-align: center;
}

.version-label {
    display: block;
    color: var(--text-muted);
    font-size: 11px;
    margin-bottom: 4px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.version-value {
    color: var(--primary);
    font-weight: 700;
    font-size: 15px;
}

.download-specs {
    margin-bottom: 24px;
}

.download-specs h3 {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.spec-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    border: 1px solid transparent;
}

.spec-item:hover {
    background: var(--bg-card);
    border-color: var(--border-color);
}

.spec-icon {
    font-size: 22px;
}

.spec-name {
    font-size: 14px;
    font-weight: 600;
}

.spec-version {
    font-size: 11px;
    color: var(--text-muted);
    margin-left: auto;
}

.download-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 32px;
}

.feature-tag {
    padding: 6px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50px;
    font-size: 12px;
    color: var(--primary);
    font-weight: 500;
    transition: var(--transition);
}

.feature-tag:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-color-hover);
}

.download-btn-primary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    padding: 18px;
    background: var(--gradient-primary);
    color: #0b0e17;
    border-radius: var(--radius-md);
    font-size: 17px;
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition);
    box-shadow: var(--shadow-primary);
    position: relative;
    overflow: hidden;
}

.download-btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
    opacity: 0;
    transition: var(--transition);
}

.download-btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-primary-lg);
}

.download-btn-primary:hover::before {
    opacity: 1;
}

.download-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-top: 20px;
}

.link-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13px;
    transition: var(--transition);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
}

.link-item:hover {
    color: var(--primary);
    background: var(--bg-card);
}

.back-home {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 28px;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 13px;
    transition: var(--transition);
}

.back-home:hover {
    color: var(--primary);
}

.back-home svg {
    width: 16px;
    height: 16px;
}

/* ============================================
   404 页面
   ============================================ */
.error-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 32px 60px;
    position: relative;
    z-index: 1;
}

.error-content {
    text-align: center;
    max-width: 560px;
}

.error-visual {
    position: relative;
    margin-bottom: 48px;
}

.error-disc {
    position: relative;
    width: 160px;
    height: 160px;
    margin: 0 auto 32px;
}

.disc-bg {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle, var(--primary), transparent);
    opacity: 0.15;
    animation: errorPulse 3s ease-in-out infinite;
}

@keyframes errorPulse {
    0%, 100% { transform: scale(1); opacity: 0.15; }
    50% { transform: scale(1.15); opacity: 0.3; }
}

.error-icon {
    font-size: 56px;
    position: relative;
    z-index: 2;
    display: block;
    filter: drop-shadow(0 0 20px rgba(0, 212, 170, 0.4));
    animation: vinylSpin 12s linear infinite;
}

.broken-lines {
    position: absolute;
    inset: 0;
    z-index: 3;
}

.line {
    position: absolute;
    background: var(--accent);
    transform-origin: center;
}

.line-1 {
    width: 100%;
    height: 2px;
    top: 45%;
    left: 0;
    animation: crackAnim 3s ease-in-out infinite;
}

.line-2 {
    width: 2px;
    height: 100%;
    left: 55%;
    top: 0;
    animation: crackAnim 3s ease-in-out infinite reverse;
}

@keyframes crackAnim {
    0%, 100% { opacity: 0.2; }
    50% { opacity: 0.7; }
}

.error-code-display {
    display: flex;
    justify-content: center;
    gap: 6px;
}

.error-number {
    font-size: 72px;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.error-zero {
    font-size: 72px;
    font-weight: 900;
    color: var(--text-muted);
    line-height: 1;
}

.error-title {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--accent), var(--accent-warm));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.error-message {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 40px;
}

.error-suggestions {
    margin-bottom: 48px;
}

.suggestion-title {
    color: var(--text-muted);
    font-size: 13px;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.suggestion-links {
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
}

.suggestion-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    background: var(--gradient-primary);
    color: #0b0e17;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 700;
    transition: var(--transition);
    box-shadow: var(--shadow-primary);
}

.suggestion-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-primary-lg);
}

.suggestion-btn.btn-secondary {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    box-shadow: none;
}

.suggestion-btn.btn-secondary:hover {
    border-color: var(--border-color-hover);
    box-shadow: 0 8px 30px rgba(0, 212, 170, 0.1);
}

.suggestion-btn svg {
    width: 18px;
    height: 18px;
}

.error-decoration {
    display: flex;
    justify-content: center;
    gap: 40px;
    opacity: 0.2;
}

.deco-note {
    font-size: 24px;
    animation: noteFloat 5s ease-in-out infinite;
}

.deco-note:nth-child(2) { animation-delay: -1.7s; }
.deco-note:nth-child(3) { animation-delay: -3.3s; }

/* ============================================
   页面进入动画
   ============================================ */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   滚动条
   ============================================ */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 212, 170, 0.2);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 212, 170, 0.4);
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .showcase-grid {
        grid-template-columns: 1fr;
    }
    .showcase-card.large {
        grid-row: auto;
    }
}

@media (max-width: 768px) {
    .nav-container { padding: 0 20px; }
    .hero-title { font-size: 48px; }
    .hero-subtitle { font-size: 17px; }
    .hero-desc { font-size: 15px; }
    .hero-section { padding: 80px 20px 40px; }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 14px;
    }
    .stat-card { padding: 24px 16px; }
    .stat-value { font-size: 30px; }

    .features-section { padding: 60px 20px; }
    .features-grid {
        grid-template-columns: 1fr 1fr;
        gap: 14px;
    }
    .section-title { font-size: 32px; }

    .download-card { padding: 36px 24px; }
    .app-info { flex-direction: column; text-align: center; }
    .specs-grid { grid-template-columns: 1fr; }
    .download-links { flex-direction: column; gap: 10px; }

    .cta-box { padding: 48px 28px; }
    .cta-box h2 { font-size: 28px; }

    .suggestion-links { flex-direction: column; align-items: center; }
    .error-number, .error-zero { font-size: 52px; }

    .footer-links { flex-direction: column; gap: 12px; }

    .showcase-grid { gap: 16px; }
}

@media (max-width: 480px) {
    .hero-section { padding: 80px 16px 32px; }
    .music-visual { width: 170px; height: 170px; }
    .vinyl-disc { width: 140px; height: 140px; }
    .hero-title { font-size: 38px; letter-spacing: -1px; }

    .stats-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
    .stat-value { font-size: 26px; }

    .features-grid { grid-template-columns: 1fr; }
    .features-section { padding: 48px 16px; }
    .section-title { font-size: 28px; }
    .section-subtitle { font-size: 14px; }

    .showcase-section { padding: 48px 16px; }
    .showcase-card { padding: 32px 24px; }
}