/* ═══════════════════════════════════════════════════════
   Guitar Chord App — Minimalistic Dark Theme
   ═══════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Variables ──────────────────────────────────────── */

:root {
    --bg-primary: #0f0f14;
    --bg-secondary: #16161e;
    --bg-tertiary: #1e1e28;
    --bg-hover: #262632;
    --bg-active: #2a2a3a;
    --surface: #1c1c26;
    --border: #2a2a38;
    --border-light: #33334a;

    --text-primary: #e8e8f0;
    --text-secondary: #9898b0;
    --text-muted: #5e5e78;

    --accent: #7c6aef;
    --accent-hover: #9080f5;
    --accent-subtle: rgba(124, 106, 239, 0.12);

    --danger: #e55565;
    --danger-hover: #f06878;
    --success: #4ecb8a;
    --warning: #f0b040;

    --chord-color: #f0b040;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;

    --shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Consolas', monospace;

    --transition: 150ms ease;
}

/* ── Reset & Base ───────────────────────────────────── */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: var(--accent);
    color: white;
}

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-light);
}

/* ── Login Page ─────────────────────────────────────── */

.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: radial-gradient(ellipse at center, var(--bg-tertiary) 0%, var(--bg-primary) 70%);
}

.login-container {
    text-align: center;
    padding: 3rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 360px;
    box-shadow: var(--shadow-lg);
}

.login-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    filter: drop-shadow(0 0 20px rgba(124, 106, 239, 0.3));
}

.login-container h1 {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

.login-container input[type="password"] {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    outline: none;
    transition: border-color var(--transition);
    margin-bottom: 1rem;
}

.login-container input[type="password"]:focus {
    border-color: var(--accent);
}

.login-container button {
    width: 100%;
}

.error-msg {
    background: rgba(229, 85, 101, 0.12);
    color: var(--danger);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    margin-bottom: 1rem;
}

/* ── Buttons ────────────────────────────────────────── */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    line-height: 1;
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-danger {
    background: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
}

.btn-danger:hover {
    background: rgba(229, 85, 101, 0.12);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn-outline:hover {
    border-color: var(--border-light);
    color: var(--text-primary);
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
}

/* ── Header ─────────────────────────────────────────── */

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    height: 56px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.header-left .logo {
    font-size: 1.4rem;
}

.header-left h1 {
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: -0.01em;
}

.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    background: var(--accent-subtle);
    color: var(--accent);
    font-size: 0.7rem;
    font-weight: 600;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    vertical-align: middle;
    margin-left: 0.25rem;
}

/* ── Admin Layout ───────────────────────────────────── */

.admin-page .app-main {
    display: flex;
    height: calc(100vh - 56px);
}

.sidebar {
    width: 280px;
    min-width: 280px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1rem 0.5rem;
}

.sidebar-header h2 {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
}

.sidebar-search {
    padding: 0 0.75rem 0.5rem;
}

.sidebar-search input {
    width: 100%;
    padding: 0.5rem 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    outline: none;
    transition: border-color var(--transition);
}

.sidebar-search input:focus {
    border-color: var(--accent);
}

.song-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.25rem 0.5rem;
}

.song-item {
    padding: 0.6rem 0.75rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition);
}

.song-item:hover {
    background: var(--bg-hover);
}

.song-item.active {
    background: var(--accent-subtle);
}

.song-item-name {
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.song-item-meta {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-footer {
    padding: 0.75rem;
    border-top: 1px solid var(--border);
}

.sidebar-footer .btn {
    width: 100%;
    justify-content: center;
}

/* ── Editor Panel ───────────────────────────────────── */

.editor-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.editor-empty {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.editor-content {
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.editor-fields {
    padding: 1rem 1.5rem 0.5rem;
}

.field-row {
    display: flex;
    gap: 0.75rem;
}

.field-row input {
    flex: 1;
    padding: 0.6rem 0.8rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.85rem;
    outline: none;
    transition: border-color var(--transition);
}

.field-row input:focus {
    border-color: var(--accent);
}

.field-row .field-lg {
    flex: 2;
}

/* ── Tabs ───────────────────────────────────────────── */

.editor-tabs {
    display: flex;
    gap: 0;
    padding: 0.75rem 1.5rem 0;
    border-bottom: 1px solid var(--border);
}

.tab {
    padding: 0.5rem 1rem;
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-muted);
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

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

.tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.tab-panel {
    display: none;
    flex: 1;
    overflow: auto;
    padding: 1rem 1.5rem;
}

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

.hint {
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.hint code {
    background: var(--bg-tertiary);
    padding: 0.1rem 0.35rem;
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--chord-color);
}

textarea#lyricsText {
    flex: 1;
    width: 100%;
    min-height: 200px;
    padding: 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.7;
    outline: none;
    resize: none;
    transition: border-color var(--transition);
}

textarea#lyricsText:focus {
    border-color: var(--accent);
}

.editor-actions {
    display: flex;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
}

/* ── Chord Toolbar ──────────────────────────────────── */

.chord-toolbar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
}

.chord-toolbar label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.chord-toolbar select {
    padding: 0.4rem 0.6rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--chord-color);
    font-family: var(--font-mono);
    font-weight: 500;
    font-size: 0.85rem;
    outline: none;
}

.chord-editor {
    flex: 1;
    overflow: auto;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.7;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    position: relative;
}

/* ── Character-Level Chord Editor ───────────────────── */

.chord-line-editable .chord-char {
    position: relative;
    display: inline-block;
    min-width: 0.6em;
    cursor: pointer;
    border-radius: 2px;
    transition: background var(--transition);
    user-select: none;
    -webkit-user-select: none;
}

.chord-line-editable .chord-char:hover {
    background: var(--accent-subtle);
    outline: 1px solid var(--border-light);
}

.chord-line-editable .chord-char.has-chord {
    background: rgba(240, 176, 64, 0.08);
}

.chord-line-editable .chord-char.has-chord::before {
    content: attr(data-chord);
    position: absolute;
    top: -1.3em;
    left: 0;
    color: var(--chord-color);
    font-size: 0.8em;
    font-weight: 600;
    white-space: nowrap;
    pointer-events: auto;
    cursor: grab;
}

.chord-line-editable .chord-char.has-chord:active::before {
    cursor: grabbing;
}

.chord-line-editable .chord-char.dragging {
    opacity: 0.4;
}

.chord-line-editable .chord-char.drag-over {
    background-color: rgba(255, 255, 255, 0.15);
    border-radius: 2px;
    box-shadow: inset 0 0 0 1px var(--accent);
}

.chord-line-editable .chord-end-add {
    color: var(--text-muted);
    font-size: 0.75em;
    margin-left: 0.3em;
    opacity: 0.4;
    transition: opacity var(--transition);
}

.chord-line-editable .chord-end-add:hover {
    opacity: 1;
    color: var(--accent);
    background: var(--accent-subtle);
}

/* ── Chord Popup ────────────────────────────────────── */

.chord-popup {
    z-index: 200;
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 0.5rem;
    box-shadow: var(--shadow-lg);
}

.chord-popup-header {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--chord-color);
    margin-bottom: 0.5rem;
    text-align: center;
}

.chord-popup-select {
    width: 100%;
    padding: 0.35rem 0.5rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    outline: none;
    margin-bottom: 0.5rem;
}

.chord-popup-actions {
    display: flex;
    gap: 0.4rem;
}

.chord-popup-actions .btn {
    flex: 1;
    justify-content: center;
}

/* ── Song Display (Chord Rendering) ─────────────────── */

.song-display,
#viewDisplay {
    font-family: var(--font-mono);
    font-size: 1rem;
    line-height: 1.5;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.chord-paragraph {
    margin-bottom: 1.2em;
}

.chord-break {
    height: 0.8em;
}

.chord-line {
    display: block;
    position: relative;
    padding-top: 1.3em;
    line-height: 1.5;
    white-space: pre-wrap;
}

.chord-word {
    position: relative;
    display: inline;
    white-space: pre-wrap;
}

.chord-word.has-chord::before {
    content: attr(data-chord);
    position: absolute;
    top: -1.3em;
    left: 0;
    color: var(--chord-color);
    font-size: 0.85em;
    font-weight: 600;
    white-space: nowrap;
    pointer-events: auto;
    cursor: pointer;
}

/* ── Viewer Layout ──────────────────────────────────── */

.viewer-main {
    max-width: 900px;
    margin: 0 auto;
    padding: 1.5rem;
}

.viewer-search {
    margin-bottom: 1.5rem;
}

.viewer-search input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    outline: none;
    transition: border-color var(--transition);
}

.viewer-search input:focus {
    border-color: var(--accent);
}

.song-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 0.75rem;
}

.song-card {
    padding: 1rem 1.2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
}

.song-card:hover {
    border-color: var(--border-light);
    background: var(--bg-tertiary);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.song-card-name {
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.song-card-interpret {
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.song-card-tag {
    display: inline-block;
    margin-top: 0.4rem;
    padding: 0.1rem 0.5rem;
    background: var(--accent-subtle);
    color: var(--accent);
    font-size: 0.68rem;
    font-weight: 500;
    border-radius: 20px;
}

/* ── Song View (Fullscreen capable) ─────────────────── */

.song-view {
    flex-direction: column;
    height: 100vh;
    background: var(--bg-primary);
}

.song-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 0.6rem 1.2rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
}

.controls-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.controls-group label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.controls-group input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100px;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    outline: none;
}

.controls-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
}

.controls-group input[type="range"]:disabled {
    opacity: 0.4;
}

.controls-group span {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
    min-width: 2rem;
}

/* Toggle switch */
.toggle {
    position: relative;
    display: inline-block;
    width: 36px;
    height: 20px;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    inset: 0;
    background: var(--border);
    border-radius: 20px;
    cursor: pointer;
    transition: background var(--transition);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    left: 2px;
    top: 2px;
    width: 16px;
    height: 16px;
    background: var(--text-primary);
    border-radius: 50%;
    transition: transform var(--transition);
}

.toggle input:checked+.toggle-slider {
    background: var(--accent);
}

.toggle input:checked+.toggle-slider::before {
    transform: translateX(16px);
}

.song-view-content {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

.song-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.song-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}

/* Fullscreen specific */
.song-view:fullscreen {
    background: var(--bg-primary);
}

.song-view:fullscreen .song-view-content {
    max-width: 1200px;
}

.song-view:fullscreen .song-display,
.song-view:fullscreen #viewDisplay {
    font-size: 1.3rem;
}

/* ── Utility ─────────────────────────────────────────── */

.empty-state {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ── Responsive ──────────────────────────────────────── */

@media (max-width: 768px) {
    .admin-page .app-main {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        min-width: 100%;
        max-height: 40vh;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .field-row {
        flex-direction: column;
    }

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

    .song-controls {
        gap: 0.75rem;
    }

    .controls-group input[type="range"] {
        width: 70px;
    }
}
/* ── Two-Column Layout ──────────────────────────────── */

.song-display.two-columns,
#viewDisplay.two-columns {
    column-count: 2;
    column-gap: 2.5rem;
    column-rule: 1px solid var(--border);
}

/* ── Light Theme (Viewer) ───────────────────────────── */

.song-view.light-theme {
    background: #fafafa;
    color: #1a1a1a;
}

.song-view.light-theme .song-controls {
    background: #f0f0f0;
    border-bottom-color: #ddd;
}

.song-view.light-theme .btn-ghost {
    color: #555;
}
.song-view.light-theme .btn-ghost:hover {
    color: #111;
    background: rgba(0,0,0,0.06);
}

.song-view.light-theme .controls-group label {
    color: #888;
}
.song-view.light-theme .controls-group span {
    color: #888;
}
.song-view.light-theme .controls-group input[type="range"] {
    background: #ccc;
}

.song-view.light-theme .song-view-content {
    background: #fff;
}

.song-view.light-theme .song-title {
    color: #111;
}

.song-view.light-theme .song-meta {
    color: #666;
    border-bottom-color: #e0e0e0;
}

.song-view.light-theme .song-display,
.song-view.light-theme #viewDisplay {
    color: #1a1a1a;
}

.song-view.light-theme .chord-word.has-chord::before {
    color: #c04000;
}

.song-view.light-theme .toggle-slider {
    background: #ccc;
}

.song-view.light-theme .song-display.two-columns,
.song-view.light-theme #viewDisplay.two-columns {
    column-rule-color: #ddd;
}

.two-columns-active .song-view-content {
    max-width: 100%;
    padding: 2rem 3rem;
}

/* ── Chord Diagram Modal ────────────────────────────── */

.chord-diagram-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.75);
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.chord-modal-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 340px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: modalIn 0.2s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: translateY(10px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.chord-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
}

.chord-modal-header h3 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--chord-color);
    font-family: var(--font-mono);
}

.chord-modal-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
}

.chord-modal-tabs .tab {
    flex: 1;
    text-align: center;
    padding: 0.8rem;
    cursor: pointer;
    background: var(--bg-primary);
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-muted);
    font-weight: 600;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    transition: all var(--transition);
}

.chord-modal-tabs .tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    background: var(--bg-secondary);
}

.chord-modal-body {
    padding: 2rem 1.25rem;
    display: flex;
    justify-content: center;
    background: var(--bg-primary);
    min-height: 200px;
}

.chord-canvas {
    display: flex;
    justify-content: center;
}

.diagram-error {
    color: var(--text-muted);
    font-size: 0.95rem;
    text-align: center;
    margin-top: 1rem;
}

/* Light theme for modal */
.song-view.light-theme + .chord-diagram-modal .chord-modal-content {
    background: #f5f5f5;
    border-color: #ddd;
}
.song-view.light-theme + .chord-diagram-modal .chord-modal-header {
    border-bottom-color: #e0e0e0;
}
.song-view.light-theme + .chord-diagram-modal .chord-modal-header h3 {
    color: #c04000;
}
.song-view.light-theme + .chord-diagram-modal .chord-modal-tabs .tab {
    background: #eaeaea;
    color: #666;
}
.song-view.light-theme + .chord-diagram-modal .chord-modal-tabs .tab.active {
    background: #f5f5f5;
    color: #333;
    border-bottom-color: #333;
}
.song-view.light-theme + .chord-diagram-modal .chord-modal-body {
    background: #fff;
    color: #111;
}

/* ── Star / Flag ────────────────────────────────────── */

.btn-star {
    font-size: 1.3rem;
    cursor: pointer;
    user-select: none;
    transition: transform var(--transition), color var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
}

.btn-star:hover {
    transform: scale(1.1);
    background: var(--bg-hover);
}

.btn-star.active {
    color: var(--warning);
}

.btn-star:not(.active) {
    color: var(--text-muted);
    opacity: 0.5;
}

.song-item-name-wrapper {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    overflow: hidden;
}

.song-item-star {
    font-size: 0.8rem;
    color: var(--warning);
    flex-shrink: 0;
}

.song-card {
    position: relative;
}

.song-card-star {
    position: absolute;
    top: 0.8rem;
    right: 0.8rem;
    color: var(--warning);
    font-size: 1.1rem;
    filter: drop-shadow(0 0 8px rgba(240, 176, 64, 0.3));
}

.song-title-wrapper {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.song-title-star {
    color: var(--warning);
    font-size: 1.4rem;
}

.song-id-badge {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    opacity: 0.6;
    margin-right: 0.4rem;
    user-select: none;
}


/* -- Viewer Navigation Buttons ------------------------ */

.nav-side-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    height: 300px; /* Limit height */
    width: 40px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition);
    z-index: 10;
    opacity: 0.15;
}

.nav-side-btn:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.03);
    color: var(--accent);
}

.nav-prev {
    left: 0;
}

.nav-next {
    right: 0;
}

.nav-side-btn span {
    transform: translateY(-2px);
}

.nav-side-btn:disabled {
    opacity: 0;
    pointer-events: none;
}

/* Adjust for small screens */
@media (max-width: 600px) {
    .nav-side-btn {
        width: 40px;
        font-size: 2rem;
    }
}