:root {
    --bg: var(--tg-theme-bg-color, #0d0d0d);
    --surface: var(--tg-theme-secondary-bg-color, #1a1a1a);
    --text: var(--tg-theme-text-color, #f0f0f0);
    --hint: var(--tg-theme-hint-color, #707070);
    --accent: var(--tg-theme-button-color, #a855f7);
    --accent-text: var(--tg-theme-button-text-color, #fff);
    --border: rgba(255,255,255,0.06);
    --radius: 12px;
}
.hidden { display: none !important; }

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro', 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding-bottom: 120px;
    -webkit-user-select: none;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

/* ── Navigation ──────────────────────────────────── */

.tabs {
    display: flex;
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg);
    padding: 8px 16px 0;
    gap: 4px;
}

.tab {
    flex: 1;
    padding: 10px 0;
    text-align: center;
    font-size: 14px;
    font-weight: 600;
    color: var(--hint);
    cursor: pointer;
    border: none;
    background: none;
    border-radius: var(--radius) var(--radius) 0 0;
    transition: all 0.2s;
    position: relative;
}

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

.close-btn {
    flex: 0 0 36px;
    height: 36px;
    background: none;
    border: none;
    border-radius: var(--radius) var(--radius) 0 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    opacity: 0.5;
    transition: opacity 0.2s;
}
.close-btn svg {
    width: 22px;
    height: 22px;
    fill: var(--hint);
}
.close-btn:active { opacity: 1; }

.tab.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 20%;
    right: 20%;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}

/* ── Pages ───────────────────────────────────────── */

.page { display: none; }
.page.active { display: block; }

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

.section-header {
    font-size: 22px;
    font-weight: 700;
    padding: 20px 16px 12px;
    letter-spacing: -0.3px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
}

.select-mode-btn {
    font-size: 13px;
    font-weight: 500;
    color: var(--accent);
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px 8px;
}
.select-mode-btn.active {
    color: var(--hint);
}

.select-header-left {
    display: flex;
    align-items: center;
    gap: 10px;
}
.select-count {
    font-size: 16px;
    font-weight: 600;
}
.select-all-btn {
    font-size: 13px;
    color: var(--accent);
    background: none;
    border: none;
    cursor: pointer;
}
.select-header-right {
    display: flex;
    align-items: center;
    gap: 8px;
}
.export-chat-btn {
    width: 100%;
    padding: 10px;
    margin-top: 8px;
    font-size: 15px;
    font-weight: 600;
    color: var(--accent-text, #fff);
    background: var(--accent, #3b82f6);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    text-align: center;
}
.select-delete-btn {
    font-size: 13px;
    font-weight: 600;
    color: #ef4444;
    background: none;
    border: none;
    cursor: pointer;
}
.select-delete-btn.disabled {
    opacity: 0.3;
    pointer-events: none;
}
.select-cancel-btn {
    font-size: 13px;
    color: var(--hint);
    background: none;
    border: none;
    cursor: pointer;
}

.track-checkbox {
    display: flex;
    align-items: center;
    width: 28px;
    height: 28px;
    flex-shrink: 0;
}
.track-checkbox svg {
    width: 22px;
    height: 22px;
    fill: var(--hint);
}
.track-checkbox.checked svg {
    fill: var(--accent);
}
.track-item.selected {
    background: rgba(168, 85, 247, 0.08);
}

.back-btn {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    margin-right: 8px;
    vertical-align: middle;
}

.back-btn svg {
    width: 24px;
    height: 24px;
    fill: var(--accent);
}

/* ── Track List ──────────────────────────────────── */

.track-list {
    list-style: none;
    padding: 0 8px;
}

.track-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    gap: 14px;
    cursor: pointer;
    border-radius: var(--radius);
    transition: background 0.15s;
}

.track-item:active {
    background: rgba(255,255,255,0.04);
}

.track-item.playing {
    background: rgba(168, 85, 247, 0.08);
}

.track-num {
    font-size: 14px;
    color: var(--hint);
    min-width: 28px;
    text-align: center;
    font-variant-numeric: tabular-nums;
}

.track-item.playing .track-num {
    color: var(--accent);
    font-size: 12px;
}

.track-info {
    flex: 1;
    overflow: hidden;
    min-width: 0;
}

.track-title {
    font-size: 15px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.3;
}

.track-item.playing .track-title {
    color: var(--accent);
}

.track-artist {
    font-size: 13px;
    color: var(--hint);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-top: 1px;
}

.track-duration {
    font-size: 13px;
    color: var(--hint);
    white-space: nowrap;
    font-variant-numeric: tabular-nums;
}

/* ── Track Delete ────────────────────────────────── */

.track-delete {
    background: none;
    border: none;
    color: var(--hint);
    cursor: pointer;
    padding: 6px;
    opacity: 0.4;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border-radius: 8px;
}

.track-delete svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

.track-delete:active,
.track-delete:hover {
    opacity: 0.8;
}

.track-delete.confirming {
    opacity: 1;
    background: #ef4444;
    color: #fff;
    padding: 4px 12px;
    border-radius: 16px;
}

.delete-confirm-text {
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
}

.track-add {
    background: none;
    border: none;
    color: var(--accent);
    cursor: pointer;
    padding: 6px;
    opacity: 0.8;
    transition: opacity 0.2s;
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.track-add svg {
    width: 22px;
    height: 22px;
    fill: currentColor;
}

.track-add:active { opacity: 0.4; }

.track-added-mark {
    color: var(--hint);
    display: flex;
    align-items: center;
    padding: 6px;
    flex-shrink: 0;
    opacity: 0.5;
}

.track-added-mark svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

/* ── Player Bar ──────────────────────────────────── */

.player-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--surface);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    z-index: 200;
    padding-bottom: env(safe-area-inset-bottom, 0);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.player-bar.hidden {
    transform: translateY(100%);
}

.player-seek-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 18px 6px;
}

.player-time-label {
    font-size: 11px;
    color: var(--hint);
    font-variant-numeric: tabular-nums;
    flex-shrink: 0;
    min-width: 32px;
    text-align: center;
}

.player-progress-wrap {
    flex: 1;
    height: 20px;
    background: transparent;
    cursor: pointer;
    position: relative;
    display: flex;
    align-items: center;
    padding: 0;
}


.progress-slider {
    position: absolute;
    left: 0;
    right: 0;
    width: 100%;
    height: 20px;
    margin: 0;
    padding: 0;
    background: transparent;
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
    z-index: 2;
}
.progress-slider::-webkit-slider-runnable-track {
    height: 3px;
    background: rgba(0,0,0,0.12);
    border: none;
    border-radius: 2px;
}
.progress-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    margin-top: -6px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
    cursor: pointer;
}
.progress-slider::-moz-range-track {
    height: 3px;
    background: rgba(0,0,0,0.12);
    border: none;
    border-radius: 2px;
}
.progress-slider::-moz-range-thumb {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--accent);
    border: 2px solid #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
    cursor: pointer;
}

.player-progress {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    height: 3px;
    background: var(--accent);
    width: 0%;
    transition: width 0.25s linear;
    border-radius: 2px;
    pointer-events: none;
    z-index: 1;
}

.player-content {
    display: flex;
    align-items: center;
    padding: 6px 18px 10px;
    gap: 16px;
}

.player-track-info {
    flex: 1;
    overflow: hidden;
    min-width: 0;
}

.player-title {
    font-size: 15px;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.3;
    margin-bottom: 2px;
}

.player-artist {
    font-size: 13px;
    color: var(--hint);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.player-controls {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

.player-btn {
    background: none;
    border: none;
    color: var(--text);
    cursor: pointer;
    padding: 8px;
    line-height: 1;
    opacity: 0.8;
    transition: opacity 0.15s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.player-btn:active { opacity: 0.4; }

.player-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.player-btn.play-btn {
    width: 50px;
    height: 50px;
    background: var(--accent);
    color: var(--accent-text);
    border-radius: 50%;
    opacity: 1;
    padding: 0;
}

.player-btn.play-btn svg {
    width: 26px;
    height: 26px;
}

.player-mode-btn {
    opacity: 0.35;
    position: relative;
}

.player-mode-btn.active {
    opacity: 1;
    color: var(--accent);
}

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

.repeat-badge {
    position: absolute;
    top: 2px;
    right: 2px;
    font-size: 8px;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
}


/* ── Search Bar ──────────────────────────────────── */

.search-bar {
    display: flex;
    gap: 8px;
    padding: 0 16px 12px;
}

.search-bar input {
    flex: 1;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 15px;
    color: var(--text);
    outline: none;
    transition: border-color 0.2s;
}

.search-bar input::placeholder {
    color: var(--hint);
}

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

.search-bar button {
    background: var(--accent);
    border: none;
    border-radius: 10px;
    padding: 0 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    transition: opacity 0.15s;
}

.search-bar button:active { opacity: 0.7; }

.search-input-wrap {
    flex: 1;
    position: relative;
}
.search-input-wrap input {
    width: 100%;
    padding-right: 36px !important;
}
.search-clear-btn {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    background: none !important;
    border: none;
    padding: 4px !important;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
}
.search-clear-btn svg {
    fill: var(--hint) !important;
    width: 16px !important;
    height: 16px !important;
}
.search-clear-btn:active svg { fill: var(--text) !important; }

.search-bar button svg {
    width: 20px;
    height: 20px;
    fill: var(--accent-text);
}

#search-result {
    padding: 0 8px;
}

.search-result-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    gap: 12px;
    border-radius: var(--radius);
    background: var(--surface);
    margin: 0 8px 12px;
}

.search-status {
    font-size: 13px;
    color: var(--hint);
    text-align: center;
    padding: 8px 16px;
}

/* ── Friends ─────────────────────────────────────── */

.friends-section {
    padding: 0 8px;
}

.friend-item {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    gap: 12px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background 0.15s;
}

.friend-item:active {
    background: rgba(255,255,255,0.04);
}

.friend-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), #6366f1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 17px;
    font-weight: 600;
    color: #fff;
    flex-shrink: 0;
}

.friend-avatar.admin {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    box-shadow: 0 0 0 2px #fff, 0 0 0 4px #f59e0b;
}

.admin-badge {
    display: inline-block;
    margin-left: 6px;
    padding: 2px 7px;
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    border-radius: 10px;
    vertical-align: middle;
    letter-spacing: 0.5px;
}

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

.friend-name {
    font-size: 15px;
    font-weight: 500;
}

.friend-username {
    font-size: 13px;
    color: var(--hint);
}

.friend-action {
    padding: 6px 16px;
    border-radius: 20px;
    border: none;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    background: var(--accent);
    color: var(--accent-text);
    flex-shrink: 0;
    transition: opacity 0.15s;
}

.friend-action:active { opacity: 0.7; }

.friend-clickable {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    min-width: 0;
    cursor: pointer;
}

.friend-arrow {
    color: var(--hint);
    font-size: 18px;
    flex-shrink: 0;
}

.friend-remove {
    background: none;
    border: none;
    color: var(--hint);
    cursor: pointer;
    padding: 6px;
    opacity: 0.4;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    flex-shrink: 0;
    border-radius: 8px;
}

.friend-remove svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

.friend-remove:active { opacity: 0.8; }

.friend-remove.confirming {
    opacity: 1;
    background: #ef4444;
    color: #fff;
    padding: 4px 12px;
    border-radius: 16px;
}

.source-tag {
    font-size: 10px;
    opacity: 0.5;
    font-weight: 600;
    margin-left: 4px;
}

.spinner-small {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-track {
    opacity: 0.5;
    pointer-events: none;
}

.track-add.downloaded {
    color: var(--hint);
    opacity: 0.5;
    pointer-events: none;
}

/* ── Empty State ─────────────────────────────────── */

.empty {
    text-align: center;
    padding: 80px 32px;
    color: var(--hint);
}

.empty-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    border-radius: 50%;
    background: rgba(255,255,255,0.04);
    display: flex;
    align-items: center;
    justify-content: center;
}

.empty-icon svg {
    width: 28px;
    height: 28px;
    fill: var(--hint);
}

.empty-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.empty-text {
    font-size: 14px;
    line-height: 1.5;
}

/* ── Book Form ───────────────────────────────────── */

.book-form {
    padding: 0 16px 16px;
}

.book-form textarea {
    width: 100%;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 14px;
    font-size: 14px;
    color: var(--text);
    outline: none;
    resize: vertical;
    font-family: inherit;
    transition: border-color 0.2s;
    min-height: 80px;
}

.book-form textarea::placeholder { color: var(--hint); }
.book-form textarea:focus { border-color: var(--accent); }

.book-btn {
    width: 100%;
    margin-top: 10px;
    padding: 12px;
    background: var(--accent);
    color: var(--accent-text);
    border: none;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.15s;
}

.book-btn:active { opacity: 0.7; }
.book-btn:disabled { opacity: 0.4; pointer-events: none; }

.book-progress {
    padding: 0 16px;
}

.book-progress.hidden { display: none; }

.book-progress-bar-wrap {
    height: 6px;
    background: rgba(255,255,255,0.08);
    border-radius: 3px;
    overflow: hidden;
}

.book-progress-bar {
    height: 100%;
    background: var(--accent);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 3px;
}

.book-progress-text {
    font-size: 13px;
    color: var(--hint);
    padding: 8px 0;
}

#book-result {
    padding: 12px 16px;
}

.book-download-link {
    display: block;
    text-align: center;
    padding: 12px;
    background: var(--accent);
    color: var(--accent-text);
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    transition: opacity 0.15s;
}

.book-download-link:active { opacity: 0.7; }

.book-download-link.book-sent {
    background: #22c55e;
    pointer-events: none;
}

/* ── Feedback ────────────────────────────────────── */

.feedback-form { padding: 0 16px 16px; }

.feedback-form textarea {
    width: 100%;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 12px 14px;
    font-size: 14px;
    color: var(--text);
    outline: none;
    resize: vertical;
    font-family: inherit;
    transition: border-color 0.2s;
    min-height: 100px;
}
.feedback-form textarea::placeholder { color: var(--hint); }
.feedback-form textarea:focus { border-color: var(--accent); }

.feedback-btn {
    width: 100%;
    margin-top: 10px;
    padding: 12px;
    background: var(--accent);
    color: var(--accent-text);
    border: none;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.15s;
}
.feedback-btn:active { opacity: 0.7; }
.feedback-btn:disabled { opacity: 0.5; }

.feedback-success {
    text-align: center;
    padding: 12px;
    color: #22c55e;
    font-size: 14px;
}
.feedback-error {
    text-align: center;
    padding: 12px;
    color: #ef4444;
    font-size: 14px;
}

/* ── Lyrics ──────────────────────────────────────── */

.player-track-info { cursor: pointer; }

.lyrics-panel {
    position: fixed;
    inset: 0;
    z-index: 150;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    align-items: flex-end;
}
.lyrics-panel.hidden { display: none; }

.lyrics-inner {
    width: 100%;
    max-height: 85vh;
    background: var(--bg);
    border-radius: 20px 20px 0 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.lyrics-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 16px 12px;
    flex-shrink: 0;
}
.lyrics-track-info { flex: 1; min-width: 0; }
.lyrics-title {
    font-size: 17px;
    font-weight: 700;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.lyrics-artist {
    font-size: 13px;
    color: var(--hint);
    margin-top: 2px;
}

.lyrics-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    display: flex;
    flex-shrink: 0;
}
.lyrics-close svg {
    width: 24px;
    height: 24px;
    fill: var(--hint);
}

.lyrics-body {
    flex: 1;
    overflow-y: auto;
    padding: 0 20px 40px;
    font-size: 15px;
    line-height: 1.9;
    color: var(--text);
    white-space: pre-wrap;
    -webkit-overflow-scrolling: touch;
}

.lyrics-placeholder {
    color: var(--hint);
    text-align: center;
    padding-top: 40px;
    font-size: 14px;
}

.lyrics-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding-top: 40px;
    color: var(--hint);
    font-size: 14px;
}

/* ── Loading ─────────────────────────────────────── */

.loading {
    text-align: center;
    padding: 60px 20px;
    color: var(--hint);
    font-size: 14px;
}

.spinner {
    width: 24px;
    height: 24px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 12px;
}

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