/* ==================== CSS Variables & Reset ==================== */
:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: #1a1f35;
    --bg-card-hover: #222842;
    --border-color: rgba(0, 240, 255, 0.12);
    --border-glow: rgba(0, 240, 255, 0.3);
    --text-primary: #e8ecf4;
    --text-secondary: #8b95a8;
    --text-muted: #5a6478;
    --accent-cyan: #00f0ff;
    --accent-purple: #b400ff;
    --accent-blue: #3b82f6;
    --accent-pink: #ff006e;
    --gradient-main: linear-gradient(135deg, #00f0ff, #b400ff);
    --gradient-card: linear-gradient(145deg, rgba(26, 31, 53, 0.9), rgba(17, 24, 39, 0.95));
    --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.15);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
    --radius: 12px;
    --radius-sm: 8px;
    --font-display: 'Orbitron', sans-serif;
    --font-body: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --header-height: 72px;
    --player-height: 72px;
}

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

html {
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-cyan) var(--bg-secondary);
}

body {
    font-family: var(--font-body);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    padding-bottom: var(--player-height);
}

a {
    text-decoration: none;
    color: inherit;
}

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

/* ==================== Particle Canvas ==================== */
#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ==================== Header ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    z-index: 100;
    backdrop-filter: blur(20px);
    background: rgba(10, 14, 26, 0.85);
    border-bottom: 1px solid var(--border-color);
}

.header-inner {
    max-width: 1400px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 40px;
}

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

.logo-text {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text-primary);
}

.logo-accent {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-cyan);
    background: rgba(0, 240, 255, 0.08);
}

/* ==================== Hero ==================== */
.hero {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 40px 80px;
    text-align: center;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(0, 240, 255, 0.06) 0%, rgba(180, 0, 255, 0.04) 40%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 24px;
}

.hero-title-line {
    display: block;
}

.hero-title-line.accent {
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 36px;
    background: var(--gradient-main);
    color: var(--bg-primary);
    font-weight: 700;
    font-size: 1rem;
    border-radius: 50px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 24px rgba(0, 240, 255, 0.25);
}

.hero-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(0, 240, 255, 0.4);
}

/* Visualizer Bars */
.hero-visualizer {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    opacity: 0.4;
}

.visualizer-bars {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 80px;
}

.visualizer-bars span {
    display: block;
    width: 4px;
    border-radius: 2px;
    background: var(--gradient-main);
    animation: visualize 1.2s ease-in-out infinite alternate;
}

.visualizer-bars span:nth-child(1)  { height: 20px; animation-delay: 0s; }
.visualizer-bars span:nth-child(2)  { height: 40px; animation-delay: 0.1s; }
.visualizer-bars span:nth-child(3)  { height: 60px; animation-delay: 0.2s; }
.visualizer-bars span:nth-child(4)  { height: 35px; animation-delay: 0.3s; }
.visualizer-bars span:nth-child(5)  { height: 50px; animation-delay: 0.4s; }
.visualizer-bars span:nth-child(6)  { height: 70px; animation-delay: 0.15s; }
.visualizer-bars span:nth-child(7)  { height: 25px; animation-delay: 0.25s; }
.visualizer-bars span:nth-child(8)  { height: 55px; animation-delay: 0.35s; }
.visualizer-bars span:nth-child(9)  { height: 40px; animation-delay: 0.45s; }
.visualizer-bars span:nth-child(10) { height: 65px; animation-delay: 0.05s; }
.visualizer-bars span:nth-child(11) { height: 30px; animation-delay: 0.12s; }
.visualizer-bars span:nth-child(12) { height: 50px; animation-delay: 0.22s; }
.visualizer-bars span:nth-child(13) { height: 75px; animation-delay: 0.32s; }
.visualizer-bars span:nth-child(14) { height: 45px; animation-delay: 0.42s; }
.visualizer-bars span:nth-child(15) { height: 60px; animation-delay: 0.08s; }
.visualizer-bars span:nth-child(16) { height: 35px; animation-delay: 0.18s; }
.visualizer-bars span:nth-child(17) { height: 55px; animation-delay: 0.28s; }
.visualizer-bars span:nth-child(18) { height: 25px; animation-delay: 0.38s; }
.visualizer-bars span:nth-child(19) { height: 45px; animation-delay: 0.48s; }
.visualizer-bars span:nth-child(20) { height: 30px; animation-delay: 0.02s; }

@keyframes visualize {
    0%   { height: 10px; opacity: 0.5; }
    100% { height: 70px; opacity: 1; }
}

/* ==================== Library Section ==================== */
.library {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 80px 40px 120px;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Category Tabs */
.category-tabs {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

.cat-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.cat-btn:hover {
    color: var(--text-primary);
    border-color: var(--border-glow);
    background: var(--bg-card-hover);
}

.cat-btn.active {
    color: var(--bg-primary);
    background: var(--gradient-main);
    border-color: transparent;
    box-shadow: 0 4px 16px rgba(0, 240, 255, 0.25);
}

.cat-btn.active svg {
    stroke: var(--bg-primary);
}

/* Sound Grid */
.sound-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

/* Sound Card */
.sound-card {
    background: var(--gradient-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    transition: all 0.35s ease;
    position: relative;
    overflow: hidden;
}

.sound-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-main);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sound-card:hover {
    border-color: var(--border-glow);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow), var(--shadow-card);
}

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

.sound-card.playing {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 30px rgba(0, 240, 255, 0.2);
}

.sound-card.playing::before {
    opacity: 1;
}

.card-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 16px;
}

.card-category {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.card-category.bgm {
    color: #34d399;
    background: rgba(52, 211, 153, 0.1);
    border: 1px solid rgba(52, 211, 153, 0.2);
}

.card-category.skill {
    color: #f472b6;
    background: rgba(244, 114, 182, 0.1);
    border: 1px solid rgba(244, 114, 182, 0.2);
}

.card-category.environment {
    color: #60a5fa;
    background: rgba(96, 165, 250, 0.1);
    border: 1px solid rgba(96, 165, 250, 0.2);
}

.card-category.ui {
    color: #fbbf24;
    background: rgba(251, 191, 36, 0.1);
    border: 1px solid rgba(251, 191, 36, 0.2);
}

.card-category.cartoon {
    color: #fb923c;
    background: rgba(251, 146, 60, 0.1);
    border: 1px solid rgba(251, 146, 60, 0.2);
}

.card-category.battle {
    color: #f87171;
    background: rgba(248, 113, 113, 0.1);
    border: 1px solid rgba(248, 113, 113, 0.2);
}

/* Card Detail Link */
.card-detail-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
    transition: all 0.3s ease;
    opacity: 0;
}

.sound-card:hover .card-detail-link {
    opacity: 1;
}

.card-detail-link:hover {
    background: rgba(0, 240, 255, 0.15);
    color: var(--accent-cyan);
}

/* Card Title Link */
.card-title-link {
    text-decoration: none;
    display: block;
}

.card-title-link:hover .card-title {
    color: var(--accent-cyan);
}

.card-category.interact {
    color: #a78bfa;
    background: rgba(167, 139, 250, 0.1);
    border: 1px solid rgba(167, 139, 250, 0.2);
}

/* ==================== Search Bar ==================== */
.search-bar {
    display: flex;
    align-items: center;
    max-width: 520px;
    margin: 0 auto 40px;
    padding: 12px 20px;
    background: var(--gradient-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    transition: all 0.35s ease;
    position: relative;
    overflow: hidden;
}

.search-bar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-main);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.search-bar:focus-within {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow), var(--shadow-card);
    transform: translateY(-2px);
}

.search-bar:focus-within::before {
    opacity: 1;
}

.search-icon {
    flex-shrink: 0;
    color: var(--text-muted);
    margin-right: 12px;
    transition: color 0.3s ease;
}

.search-bar:focus-within .search-icon {
    color: var(--accent-cyan);
}

.search-input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    letter-spacing: 0.3px;
}

.search-input::placeholder {
    color: var(--text-muted);
    transition: color 0.3s;
}

.search-bar:focus-within .search-input::placeholder {
    color: var(--text-secondary);
}

.search-clear {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: rgba(0, 240, 255, 0.08);
    color: var(--text-secondary);
    cursor: pointer;
    border: 1px solid rgba(0, 240, 255, 0.15);
    transition: all 0.3s ease;
}

.search-clear:hover {
    background: rgba(0, 240, 255, 0.18);
    color: var(--accent-cyan);
    border-color: rgba(0, 240, 255, 0.3);
}

.card-duration {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.card-waveform {
    height: 40px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 2px;
    opacity: 0.5;
    transition: opacity 0.3s;
}

.sound-card:hover .card-waveform,
.sound-card.playing .card-waveform {
    opacity: 1;
}

.card-waveform span {
    flex: 1;
    background: var(--gradient-main);
    border-radius: 1px;
    min-height: 3px;
    transition: height 0.2s;
}

.card-actions {
    display: flex;
    gap: 12px;
}

.btn-play, .btn-download {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-play {
    background: rgba(0, 240, 255, 0.1);
    color: var(--accent-cyan);
    border: 1px solid rgba(0, 240, 255, 0.2);
}

.btn-play:hover {
    background: rgba(0, 240, 255, 0.18);
    border-color: rgba(0, 240, 255, 0.4);
}

.btn-play.playing {
    background: var(--accent-cyan);
    color: var(--bg-primary);
    border-color: var(--accent-cyan);
}

.btn-download {
    background: rgba(180, 0, 255, 0.1);
    color: #c084fc;
    border: 1px solid rgba(180, 0, 255, 0.2);
}

.btn-download:hover {
    background: rgba(180, 0, 255, 0.18);
    border-color: rgba(180, 0, 255, 0.4);
}

/* ==================== Global Player ==================== */
.global-player {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--player-height);
    z-index: 100;
    backdrop-filter: blur(20px);
    background: rgba(10, 14, 26, 0.92);
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 32px;
    gap: 20px;
}

.player-info {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 200px;
}

.player-wave {
    display: flex;
    align-items: center;
    gap: 3px;
    height: 24px;
}

.player-wave span {
    display: block;
    width: 3px;
    height: 8px;
    background: var(--accent-cyan);
    border-radius: 2px;
    transition: height 0.2s;
}

.global-player.is-playing .player-wave span {
    animation: playerWave 0.6s ease-in-out infinite alternate;
}

.global-player.is-playing .player-wave span:nth-child(1) { animation-delay: 0s; }
.global-player.is-playing .player-wave span:nth-child(2) { animation-delay: 0.1s; }
.global-player.is-playing .player-wave span:nth-child(3) { animation-delay: 0.2s; }
.global-player.is-playing .player-wave span:nth-child(4) { animation-delay: 0.3s; }
.global-player.is-playing .player-wave span:nth-child(5) { animation-delay: 0.4s; }

@keyframes playerWave {
    0%   { height: 6px; }
    100% { height: 20px; }
}

.player-name {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.player-controls {
    display: flex;
    align-items: center;
}

.player-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 240, 255, 0.1);
    color: var(--accent-cyan);
    border: 1px solid rgba(0, 240, 255, 0.2);
    transition: all 0.3s ease;
}

.player-btn:hover {
    background: var(--accent-cyan);
    color: var(--bg-primary);
    border-color: var(--accent-cyan);
}

.player-progress-wrap {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 12px;
}

.player-progress {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 3px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.player-progress-bar {
    height: 100%;
    width: 0%;
    background: var(--gradient-main);
    border-radius: 3px;
    transition: width 0.1s linear;
}

.player-time {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
    min-width: 90px;
}

.player-volume {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
}

.volume-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100px;
    height: 4px;
    border-radius: 2px;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
}

.volume-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-cyan);
    cursor: pointer;
    box-shadow: 0 0 8px rgba(0, 240, 255, 0.4);
}

.volume-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent-cyan);
    cursor: pointer;
    border: none;
    box-shadow: 0 0 8px rgba(0, 240, 255, 0.4);
}

/* ==================== About ==================== */
.about {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    padding: 80px 40px 120px;
    text-align: center;
}

.about-content p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 40px;
}

.about-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
}

.stat {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stat-num {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ==================== Footer ==================== */
.footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 24px 40px calc(24px + var(--player-height));
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
}

.footer-contact {
    margin-top: 8px;
}

.footer-contact a {
    color: var(--accent-cyan);
    transition: opacity 0.3s ease;
}

.footer-contact a:hover {
    opacity: 0.8;
}

.footer-disclaimer {
    margin-top: 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.6;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.footer-icp {
    margin-top: 8px;
    font-size: 0.8rem;
}

.footer-icp a {
    color: var(--text-muted);
    transition: color 0.3s ease;
}

.footer-icp a:hover {
    color: var(--accent-cyan);
}

/* ==================== About Contact ==================== */
.about-contact {
    margin-top: 32px;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.about-contact a {
    color: var(--accent-cyan);
    transition: opacity 0.3s ease;
}

.about-contact a:hover {
    opacity: 0.8;
}

/* ==================== Animations ==================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.sound-card {
    animation: fadeInUp 0.5s ease forwards;
    opacity: 0;
}

.sound-card:nth-child(1) { animation-delay: 0.05s; }
.sound-card:nth-child(2) { animation-delay: 0.1s; }
.sound-card:nth-child(3) { animation-delay: 0.15s; }
.sound-card:nth-child(4) { animation-delay: 0.2s; }
.sound-card:nth-child(5) { animation-delay: 0.25s; }
.sound-card:nth-child(6) { animation-delay: 0.3s; }
.sound-card:nth-child(7) { animation-delay: 0.35s; }
.sound-card:nth-child(8) { animation-delay: 0.4s; }
.sound-card:nth-child(9) { animation-delay: 0.45s; }

/* ==================== Breadcrumb Navigation ==================== */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 100px 40px 20px;
    max-width: 1400px;
    margin: 0 auto;
    font-size: 0.9rem;
    position: relative;
    z-index: 1;
}

.breadcrumb a {
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.breadcrumb a:hover {
    color: var(--accent-cyan);
}

.breadcrumb .separator {
    color: var(--text-muted);
}

.breadcrumb .current {
    color: var(--text-primary);
    font-weight: 500;
}

/* ==================== Page Title (Sub-pages) ==================== */
.page-title {
    font-family: var(--font-display);
    font-size: 2.2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ==================== SEO Content Section ==================== */
.seo-content {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 60px 40px 40px;
}

.seo-content h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
    text-align: center;
}

.seo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.seo-item {
    background: var(--gradient-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    transition: all 0.3s ease;
}

.seo-item:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
}

.seo-item h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.seo-item h3::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 20px;
    background: var(--gradient-main);
    border-radius: 2px;
}

.seo-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
}

/* ==================== About Page Styles ==================== */
.about-page {
    position: relative;
    z-index: 1;
    min-height: calc(100vh - var(--header-height));
    padding-top: 20px;
}

.about-content-page {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 40px 120px;
}

.about-section {
    margin-bottom: 48px;
}

.about-section h2 {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.about-section h2::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 24px;
    background: var(--gradient-main);
    border-radius: 2px;
}

.about-section p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 16px;
}

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    position: relative;
    padding-left: 28px;
    margin-bottom: 14px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.feature-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 10px;
    height: 10px;
    background: var(--gradient-main);
    border-radius: 50%;
}

.feature-list li strong {
    color: var(--text-primary);
}

.about-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    background: var(--gradient-main);
    color: var(--bg-primary);
    font-weight: 700;
    font-size: 1rem;
    border-radius: 50px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 24px rgba(0, 240, 255, 0.25);
    margin-top: 16px;
}

.about-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(0, 240, 255, 0.4);
}

/* ==================== Responsive ==================== */
@media (max-width: 1024px) {
    .sound-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 20px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .header-inner {
        padding: 0 20px;
    }

    .hero {
        padding: 100px 20px 60px;
    }

    .library {
        padding: 60px 20px 100px;
    }

    .category-tabs {
        gap: 8px;
    }

    .cat-btn {
        padding: 8px 16px;
        font-size: 0.8rem;
    }

    .sound-grid {
        grid-template-columns: 1fr;
    }

    .global-player {
        padding: 0 16px;
        gap: 12px;
    }

    .player-info {
        min-width: 120px;
    }

    .player-volume {
        display: none;
    }

    .about-stats {
        gap: 32px;
    }
}

/* ==================== Load More Button ==================== */
.load-more-wrap {
    grid-column: 1 / -1;
    display: flex;
    justify-content: center;
    padding: 32px 0 16px;
}

.load-more-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 40px;
    background: var(--bg-card);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 50px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    cursor: pointer;
}

.load-more-btn:hover:not(:disabled) {
    color: var(--accent-cyan);
    border-color: var(--border-glow);
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.load-more-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}