:root {
    --music-bg: #0b0d10;
    --music-surface: #12151a;
    --music-surface-2: #1a1f27;
    --music-border: rgba(255, 255, 255, 0.08);
    --music-text: #f3f5f7;
    --music-muted: #9aa3b2;
    --music-accent: #1ed760;
    --music-brand: #a33aff;
    --music-brand-soft: rgba(163, 58, 255, 0.22);
    --music-karaoke: #ffffff;
    --music-karaoke-past: rgba(255, 255, 255, 0.42);
    --music-karaoke-active: #1ed760;
    --music-translation: #b8c0cc;
    --music-player-h: 96px;
    --music-sidebar-w: 320px;
}

[data-theme="light"] {
    --music-bg: #eef1f5;
    --music-surface: #ffffff;
    --music-surface-2: #f4f6f9;
    --music-border: rgba(0, 0, 0, 0.08);
    --music-text: #12151a;
    --music-muted: #5f6b7a;
    --music-karaoke: #12151a;
    --music-karaoke-past: rgba(18, 21, 26, 0.35);
    --music-translation: #5f6b7a;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    min-height: 100%;
}

body.music-app {
    font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
    background: var(--music-bg);
    color: var(--music-text);
    overflow: hidden;
}

.music-shell {
    display: grid;
    grid-template-columns: var(--music-sidebar-w) 1fr;
    height: calc(100vh - var(--music-player-h));
}

.music-sidebar {
    background: linear-gradient(180deg, var(--music-surface), var(--music-bg));
    border-right: 1px solid var(--music-border);
    display: flex;
    flex-direction: column;
    min-height: 0;
    z-index: 20;
}

.music-sidebar-head {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
    align-items: center;
    gap: 12px;
    padding: 18px 16px 0;
}

.music-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: inherit;
    min-width: 0;
}

.music-brand-mark {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--music-brand), #6b21ff);
    color: #fff;
    font-size: 1.1rem;
    box-shadow: 0 8px 24px rgba(163, 58, 255, 0.35);
    flex-shrink: 0;
}

.music-brand-text {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.music-brand-text strong {
    font-size: 1rem;
    line-height: 1.2;
}

.music-brand-text small {
    color: var(--music-muted);
    font-size: 0.72rem;
}

.music-sidebar-foot {
    padding: 12px 16px 16px;
    border-top: 1px solid var(--music-border);
    margin-top: auto;
}

.music-site-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--music-muted);
    text-decoration: none;
    font-size: 0.82rem;
    transition: color 0.2s ease;
}

.music-site-link:hover {
    color: var(--music-brand);
}

.sidebar-close-btn {
    align-self: center;
}

.music-search-wrap {
    grid-column: 1 / -1;
    padding: 4px 0 14px;
}

.music-search-field {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    border: 1px solid var(--music-border);
    background: var(--music-surface-2);
    border-radius: 999px;
    padding: 0 14px 0 12px;
}

.music-search-field:focus-within {
    border-color: var(--music-brand);
    box-shadow: 0 0 0 3px var(--music-brand-soft);
}

.music-search-field i {
    color: var(--music-muted);
    font-size: 0.85rem;
    flex-shrink: 0;
}

.music-search-field input {
    width: 100%;
    border: none;
    background: transparent;
    color: var(--music-text);
    padding: 10px 0;
    outline: none;
    min-width: 0;
}

.music-track-list {
    overflow: auto;
    padding: 8px 10px 16px;
    flex: 1;
    scrollbar-gutter: stable;
}

.music-track-list,
.music-lyrics-scroll {
    scrollbar-width: thin;
    scrollbar-color: rgba(163, 58, 255, 0.45) transparent;
}

.music-track-list::-webkit-scrollbar,
.music-lyrics-scroll::-webkit-scrollbar {
    width: 8px;
}

.music-track-list::-webkit-scrollbar-track,
.music-lyrics-scroll::-webkit-scrollbar-track {
    background: transparent;
    margin: 6px 0;
}

.music-track-list::-webkit-scrollbar-thumb,
.music-lyrics-scroll::-webkit-scrollbar-thumb {
    background: rgba(163, 58, 255, 0.35);
    border-radius: 999px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

.music-track-list::-webkit-scrollbar-thumb:hover,
.music-lyrics-scroll::-webkit-scrollbar-thumb:hover {
    background: rgba(163, 58, 255, 0.55);
    background-clip: padding-box;
}

[data-theme="light"] .music-track-list,
[data-theme="light"] .music-lyrics-scroll {
    scrollbar-color: rgba(107, 33, 168, 0.4) transparent;
}

[data-theme="light"] .music-track-list::-webkit-scrollbar-thumb,
[data-theme="light"] .music-lyrics-scroll::-webkit-scrollbar-thumb {
    background: rgba(107, 33, 168, 0.28);
    background-clip: padding-box;
}

.music-track-item {
    display: grid;
    grid-template-columns: 48px 1fr auto;
    gap: 12px;
    align-items: center;
    width: 100%;
    border: none;
    background: transparent;
    color: inherit;
    text-align: left;
    padding: 10px;
    border-radius: 12px;
    cursor: pointer;
    transition: background 0.15s ease;
}

.music-track-item:hover,
.music-track-item.active {
    background: var(--music-surface-2);
}

.music-track-item.active {
    box-shadow: inset 3px 0 0 var(--music-brand);
}

.music-track-item img {
    width: 48px;
    height: 48px;
    border-radius: 8px;
    object-fit: cover;
}

.music-track-item .title {
    display: block;
    font-weight: 600;
    font-size: 0.92rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.music-track-item .subtitle {
    display: block;
    color: var(--music-muted);
    font-size: 0.78rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.music-track-item .type-icon {
    color: var(--music-muted);
    font-size: 0.85rem;
}

.music-empty {
    color: var(--music-muted);
    padding: 16px;
    text-align: center;
}

.music-main {
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
    overflow: hidden;
    background:
        radial-gradient(circle at top right, rgba(163, 58, 255, 0.12), transparent 40%),
        radial-gradient(circle at bottom left, rgba(30, 215, 96, 0.08), transparent 35%),
        var(--music-bg);
}

.music-topbar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
}

.music-now-playing {
    flex: 1;
    min-width: 0;
}

.music-now-title {
    font-weight: 600;
}

.music-stage {
    flex: 1 1 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    min-height: 0;
    overflow: auto;
}

.music-landing {
    width: min(920px, 100%);
    display: grid;
    gap: 28px;
    animation: musicLandingIn 0.5s ease;
}

.music-landing[hidden] {
    display: none !important;
}

@keyframes musicLandingIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

.music-landing-hero {
    position: relative;
    padding: 36px 28px;
    border-radius: 24px;
    border: 1px solid var(--music-border);
    background: linear-gradient(145deg, rgba(163, 58, 255, 0.14), rgba(30, 215, 96, 0.06) 55%, transparent),
        var(--music-surface);
    overflow: hidden;
    text-align: center;
}

.music-landing-glow {
    position: absolute;
    inset: -40% auto auto 50%;
    width: 320px;
    height: 320px;
    transform: translateX(-50%);
    background: radial-gradient(circle, rgba(163, 58, 255, 0.35), transparent 70%);
    pointer-events: none;
}

.music-landing-badge {
    position: relative;
    display: inline-block;
    margin-bottom: 14px;
    padding: 6px 12px;
    border-radius: 999px;
    background: var(--music-brand-soft);
    color: var(--music-brand);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.music-landing-hero h1 {
    position: relative;
    margin: 0 0 12px;
    font-size: clamp(1.6rem, 3vw, 2.35rem);
    line-height: 1.15;
    color: var(--music-text);
}

.music-landing-lead {
    position: relative;
    margin: 0 auto 22px;
    max-width: 620px;
    color: var(--music-muted);
    font-size: 1rem;
    line-height: 1.6;
}

.music-landing-cta {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    border: none;
    border-radius: 999px;
    padding: 12px 22px;
    background: linear-gradient(135deg, var(--music-brand), #7c3aed);
    color: #fff;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 12px 30px rgba(163, 58, 255, 0.35);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.music-landing-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 16px 36px rgba(163, 58, 255, 0.42);
}

.music-landing-features {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.music-feature-card {
    padding: 18px 16px;
    border-radius: 16px;
    border: 1px solid var(--music-border);
    background: var(--music-surface);
}

.music-feature-icon {
    display: inline-flex;
    width: 36px;
    height: 36px;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--music-surface-2);
    color: var(--music-brand);
    margin-bottom: 10px;
}

.music-feature-card h2 {
    margin: 0 0 8px;
    font-size: 0.98rem;
    color: var(--music-text);
}

.music-feature-card p {
    margin: 0;
    color: var(--music-muted);
    font-size: 0.86rem;
    line-height: 1.5;
}

.music-stage-empty {
    text-align: center;
    color: var(--music-muted);
    max-width: 420px;
}

.music-stage-empty i {
    font-size: 3rem;
    color: var(--music-brand);
    margin-bottom: 16px;
}

.music-stage-empty h1 {
    color: var(--music-text);
    margin: 0 0 8px;
    font-size: 1.6rem;
}

.music-visual {
    aspect-ratio: 1;
    width: min(520px, 72vw);
    max-width: 100%;
    max-height: 100%;
    height: auto;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
    background: var(--music-surface-2);
    flex-shrink: 1;
}

.music-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.music-lyrics-panel {
    border-top: 1px solid var(--music-border);
    background: rgba(0, 0, 0, 0.18);
    backdrop-filter: blur(12px);
    flex: 0 0 auto;
    max-height: 42vh;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.music-lyrics-panel[hidden] {
    display: none !important;
}

[data-theme="light"] .music-lyrics-panel {
    background: rgba(255, 255, 255, 0.72);
}

.music-lyrics-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px 0;
}

.music-lyrics-header h2 {
    margin: 0;
    font-size: 0.95rem;
    color: var(--music-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.music-lyrics-scroll {
    flex: 1 1 auto;
    min-height: 0;
    overflow: auto;
    padding: 24px 20px 32px;
    scroll-behavior: smooth;
    mask-image: linear-gradient(180deg, transparent, #000 8%, #000 92%, transparent);
}

.music-lyrics-empty {
    text-align: center;
    color: var(--music-muted);
}

.lyric-line {
    margin: 18px 0;
    text-align: center;
    transition: opacity 0.25s ease, transform 0.25s ease;
    opacity: 0.38;
    transform: scale(0.98);
    cursor: pointer;
    border-radius: 8px;
    padding: 4px 8px;
}

.lyric-line:hover {
    opacity: 0.72;
}

.lyric-line:focus-visible {
    outline: 2px solid var(--music-accent, #1ed760);
    outline-offset: 4px;
}

.lyric-line.active {
    opacity: 1;
    transform: scale(1);
}

.lyric-line.active:hover {
    opacity: 1;
}

.lyric-line.past {
    opacity: 0.62;
}

.lyric-line.past:hover {
    opacity: 0.78;
}

.lyric-line.line-complete .lyric-original {
    animation: lyric-line-finish 0.55s ease-out forwards;
}

.lyric-line.line-complete .lyric-translation {
    animation: lyric-translation-finish 0.55s ease-out 0.05s forwards;
}

@keyframes lyric-line-finish {
    0% {
        transform: scale(1);
        filter: brightness(1);
    }
    40% {
        transform: scale(1.03);
        filter: brightness(1.15);
        text-shadow: 0 0 24px rgba(30, 215, 96, 0.35);
    }
    100% {
        transform: scale(1);
        filter: brightness(1);
        text-shadow: none;
    }
}

@keyframes lyric-translation-finish {
    0% { opacity: 0.85; transform: translateY(0); }
    50% { opacity: 1; transform: translateY(-2px); }
    100% { opacity: 0.85; transform: translateY(0); }
}

.lyric-original {
    font-size: clamp(1.35rem, 2.8vw, 2rem);
    font-weight: 700;
    line-height: 1.45;
    letter-spacing: 0.02em;
}

.lyric-translation {
    margin-top: 8px;
    font-size: clamp(0.75rem, 1.45vw, 0.92rem);
    font-weight: 500;
    color: var(--music-translation);
    line-height: 1.35;
    opacity: 0.88;
}

.syllable {
    color: var(--music-karaoke-past);
    transition: color 0.04s ease-out, text-shadow 0.04s ease-out;
    will-change: color;
}

.syllable.active {
    color: var(--music-karaoke-active);
    text-shadow: 0 0 18px rgba(30, 215, 96, 0.35);
}

.syllable.done {
    color: var(--music-karaoke);
}

.music-player-bar {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    height: var(--music-player-h);
    display: grid;
    grid-template-columns: minmax(200px, 1fr) 2fr minmax(160px, 1fr);
    gap: 16px;
    align-items: center;
    padding: 12px 20px;
    background: rgba(10, 12, 15, 0.92);
    border-top: 1px solid var(--music-border);
    backdrop-filter: blur(16px);
    z-index: 30;
}

[data-theme="light"] .music-player-bar {
    background: rgba(255, 255, 255, 0.94);
}

.player-track-info {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.player-cover-wrap {
    width: 56px;
    height: 56px;
    border-radius: 10px;
    overflow: hidden;
    flex-shrink: 0;
    background: var(--music-surface-2);
}

.player-cover {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.player-meta {
    min-width: 0;
}

.player-title,
.player-artist {
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.player-title {
    font-weight: 600;
    font-size: 0.92rem;
}

.player-artist {
    color: var(--music-muted);
    font-size: 0.8rem;
}

.player-controls-center {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: center;
}

.player-buttons {
    display: flex;
    align-items: center;
    gap: 16px;
}

.player-play-btn {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: none;
    background: var(--music-text);
    color: var(--music-bg);
    cursor: pointer;
    display: grid;
    place-items: center;
}

.player-play-btn:disabled,
.icon-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.player-timeline {
    display: grid;
    grid-template-columns: 44px 1fr 44px;
    gap: 10px;
    align-items: center;
    width: min(640px, 100%);
}

.player-time {
    font-size: 0.75rem;
    color: var(--music-muted);
    text-align: center;
    font-variant-numeric: tabular-nums;
}

.player-timeline input[type="range"] {
    width: 100%;
    accent-color: var(--music-brand);
}

.player-controls-right {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
}

.player-volume {
    display: flex;
    align-items: center;
    gap: 8px;
    min-width: 120px;
}

.player-volume input[type="range"] {
    width: 100%;
    accent-color: var(--music-brand);
}

.icon-btn {
    width: 36px;
    height: 36px;
    border: none;
    border-radius: 50%;
    background: transparent;
    color: var(--music-muted);
    cursor: pointer;
}

.icon-btn:hover:not(:disabled) {
    color: var(--music-text);
    background: var(--music-surface-2);
}

.lyrics-toggle.active {
    color: var(--music-accent);
}

.mobile-only {
    display: none;
}

.music-sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(2px);
    z-index: 15;
}

[data-theme="light"] .music-sidebar-backdrop {
    background: rgba(18, 21, 26, 0.25);
}

@media (max-width: 900px) {
    .music-shell {
        grid-template-columns: 1fr;
    }

    .music-sidebar {
        position: fixed;
        inset: 0 auto 0 0;
        width: min(var(--music-sidebar-w), 88vw);
        transform: translateX(-105%);
        transition: transform 0.25s ease;
        box-shadow: 12px 0 40px rgba(0, 0, 0, 0.35);
    }

    .music-sidebar.open {
        transform: translateX(0);
    }

    .music-sidebar-backdrop {
        display: block;
    }

    .music-sidebar-backdrop[hidden] {
        display: none;
    }

    .mobile-only {
        display: inline-grid;
        place-items: center;
    }

    .music-player-bar {
        grid-template-columns: 1fr;
        height: auto;
        gap: 10px;
        padding-bottom: max(12px, env(safe-area-inset-bottom));
    }

    .player-track-info {
        display: none;
    }

    .player-controls-right {
        display: none;
    }

    .player-controls-center {
        width: 100%;
    }

    .music-topbar {
        padding: 12px 14px;
        gap: 8px;
    }

    .music-topbar .lyrics-toggle.active {
        color: var(--music-accent);
        background: var(--music-surface-2);
    }

    .music-landing-features {
        grid-template-columns: 1fr;
    }

    .music-landing-hero {
        padding: 28px 18px;
    }

    .music-visual {
        width: min(360px, 84vw);
    }

    .music-stage {
        padding: 16px 12px 8px;
    }

    .music-lyrics-panel {
        max-height: 50vh;
    }
}