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

:root {
    --bg: #1a1a2e;
    --bg-card: #16213e;
    --bg-input: #0f3460;
    --accent: #e94560;
    --accent-hover: #ff6b81;
    --accent-glow: rgba(233, 69, 96, 0.12);
    --text: #eee;
    --text-dim: #8a8a9a;
    --border: #2a2a4a;
    --success: #2ed573;
    --overlay: rgba(0, 0, 0, 0.7);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-tap-highlight-color: transparent;
}

/* --- Header --- */

.header {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    background: var(--bg);
    z-index: 10;
}

.header h1 {
    font-size: 18px;
    font-weight: 600;
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.back-btn {
    background: none;
    border: none;
    color: var(--accent);
    font-size: 16px;
    cursor: pointer;
    padding: 4px 12px 4px 0;
}

/* --- Add Video Form --- */

.add-form {
    padding: 12px 16px;
    display: flex;
    gap: 8px;
}

.add-form input {
    flex: 1;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg-input);
    color: var(--text);
    font-size: 14px;
    outline: none;
}

.add-form input::placeholder {
    color: var(--text-dim);
}

.add-form input:focus {
    border-color: var(--accent);
}

.add-form button {
    padding: 10px 16px;
    border-radius: 8px;
    border: none;
    background: var(--accent);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
}

.add-form button:active {
    background: var(--accent-hover);
}

.add-form button:disabled {
    opacity: 0.5;
    cursor: default;
}

/* --- Video List --- */

.video-list {
    padding: 8px 16px;
}

.video-card {
    display: flex;
    align-items: center;
    gap: 0;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.video-card-body {
    display: flex;
    gap: 12px;
    flex: 1;
    min-width: 0;
    cursor: pointer;
}

.video-card-body:active {
    opacity: 0.7;
}

.video-remove {
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 22px;
    padding: 8px 4px 8px 10px;
    cursor: pointer;
    flex-shrink: 0;
    line-height: 1;
}

.video-remove:active {
    color: var(--accent);
}

.video-thumb {
    width: 120px;
    height: 68px;
    border-radius: 6px;
    object-fit: cover;
    flex-shrink: 0;
    background: var(--bg-card);
}

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

.video-title {
    font-size: 14px;
    font-weight: 500;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    font-size: 12px;
    color: var(--text-dim);
    margin-top: 4px;
}

.clear-btn {
    display: block;
    margin: 0 16px 4px;
    padding: 8px 14px;
    background: none;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-dim);
    font-size: 13px;
    cursor: pointer;
    text-align: center;
}

.clear-btn:active {
    border-color: var(--accent);
    color: var(--accent);
}

.clear-btn.hidden {
    display: none;
}

/* --- Player Page --- */

.player-page {
    display: none;
    flex-direction: column;
    height: 100vh;
}

.player-page.active {
    display: flex;
}

.library-page.hidden {
    display: none;
}

.player-wrap {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #000;
    flex-shrink: 0;
}

.player-wrap iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* --- Speed Bar --- */

.speed-bar {
    display: flex;
    justify-content: center;
    gap: 6px;
    padding: 8px 12px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.speed-btn {
    padding: 5px 14px;
    border-radius: 16px;
    border: 1px solid var(--border);
    background: none;
    color: var(--text-dim);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
}

.speed-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.speed-btn:active {
    opacity: 0.7;
}

/* --- Subtitle Area --- */

.subtitle-container {
    flex: 1;
    overflow-y: auto;
    padding: 16px 12px;
    scroll-behavior: smooth;
}

.sub-segment {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 12px;
    margin-bottom: 2px;
    border-radius: 10px;
    border-left: 3px solid transparent;
    transition: opacity 0.15s, background 0.15s, border-color 0.15s;
}

.seg-time {
    font-size: 11px;
    color: var(--text-dim);
    min-width: 36px;
    padding-top: 3px;
    flex-shrink: 0;
    font-variant-numeric: tabular-nums;
    opacity: 0.6;
}

.seg-text {
    flex: 1;
    line-height: 1.9;
}

/* --- Segment States --- */

.sub-segment.past {
    opacity: 0.35;
}

.sub-segment.past .seg-time {
    opacity: 0.4;
}

.sub-segment.current {
    background: var(--accent-glow);
    border-left-color: var(--accent);
    opacity: 1;
}

.sub-segment.current .seg-time {
    color: var(--accent);
    opacity: 1;
    font-weight: 600;
}

.sub-segment.current .seg-text {
    font-size: 16px;
    font-weight: 500;
}

.sub-segment.upcoming {
    opacity: 0.55;
}

.sub-segment.far {
    opacity: 0.25;
}

/* --- Clickable Words --- */

.sub-word {
    display: inline;
    cursor: pointer;
    padding: 2px 3px;
    border-radius: 4px;
    transition: all 0.15s;
    -webkit-user-select: none;
    user-select: none;
}

.sub-word:hover {
    background: rgba(233, 69, 96, 0.15);
}

.sub-word:active {
    background: var(--accent);
    color: #fff;
    transform: scale(1.08);
}

.sub-word.highlight {
    color: var(--accent);
    font-weight: 700;
    text-decoration: underline;
    text-decoration-color: var(--accent);
    text-underline-offset: 3px;
    text-decoration-thickness: 2px;
}

.subs-ready {
    text-align: center;
    padding: 14px;
    margin: 12px 0;
    color: var(--success);
    font-size: 14px;
    font-weight: 500;
    border: 1px solid var(--success);
    border-radius: 8px;
    background: rgba(46, 213, 115, 0.08);
}

/* --- Word Popup --- */

.popup-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--overlay);
    z-index: 100;
    align-items: flex-end;
    justify-content: center;
}

.popup-overlay.active {
    display: flex;
}

.popup-card {
    background: var(--bg-card);
    width: 100%;
    max-width: 420px;
    border-radius: 16px 16px 0 0;
    padding: 24px 20px;
    animation: slide-up 0.2s ease-out;
}

@keyframes slide-up {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}

.popup-word {
    font-size: 22px;
    font-weight: 700;
}

.popup-phonetic {
    font-size: 14px;
    color: var(--text-dim);
    margin-top: 2px;
}

.popup-audio {
    display: flex;
    gap: 12px;
    margin-top: 12px;
}

.audio-btn {
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid var(--border);
    background: none;
    color: var(--text);
    font-size: 13px;
    cursor: pointer;
}

.audio-btn:active {
    background: var(--bg-input);
}

.popup-pos {
    font-size: 13px;
    color: var(--accent);
    margin-top: 14px;
    font-style: italic;
}

.popup-def {
    font-size: 15px;
    line-height: 1.5;
    margin-top: 6px;
}

.popup-example {
    font-size: 13px;
    color: var(--text-dim);
    margin-top: 8px;
    font-style: italic;
}

.popup-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.popup-actions button {
    flex: 1;
    padding: 12px;
    border-radius: 10px;
    border: none;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
}

.btn-save {
    background: var(--accent);
    color: #fff;
}

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

.btn-save.saved {
    background: var(--success);
}

.btn-close {
    background: var(--bg-input);
    color: var(--text);
}

.btn-close:active {
    opacity: 0.7;
}

/* --- Loading / Status --- */

.status-msg {
    text-align: center;
    padding: 40px 16px;
    color: var(--text-dim);
    font-size: 14px;
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
    margin-right: 6px;
}

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