:root {
    --xl-primary-50: #eff6ff;
    --xl-primary-100: #dbeafe;
    --xl-primary-500: #2563eb;
    --xl-primary-600: #1d4ed8;
    --xl-primary-700: #1e40af;
    --xl-accent-500: #f59e0b;
    --xl-success: #15803d;
    --xl-warning: #b45309;
    --xl-danger: #b91c1c;
    --xl-ink: #0f172a;
    --xl-muted: #64748b;
    --xl-surface: #ffffff;
    --xl-surface-soft: #f8fafc;
    --xl-border: #e2e8f0;
    --xl-space-1: .25rem;
    --xl-space-2: .5rem;
    --xl-space-3: .75rem;
    --xl-space-4: 1rem;
    --xl-space-6: 1.5rem;
    --xl-space-8: 2rem;
    --xl-radius-sm: .5rem;
    --xl-radius-md: .875rem;
    --xl-radius-lg: 1.25rem;
    --xl-shadow-sm: 0 1px 2px rgba(15, 23, 42, .08);
    --xl-shadow-md: 0 14px 40px rgba(15, 23, 42, .12);
    --xl-content: 1200px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { color: var(--xl-ink); background: var(--xl-surface-soft); }
:where(a, button, input, select, textarea, [tabindex]):focus-visible {
    outline: 3px solid #60a5fa !important;
    outline-offset: 3px !important;
}
button, input, select, textarea { font: inherit; }
button, [role="button"], input[type="button"], input[type="submit"] { min-height: 44px; }
[dir="ltr"] { unicode-bidi: isolate; }

.xl-skip-link {
    position: fixed; inset-block-start: .5rem; inset-inline-start: .5rem; z-index: 10000;
    transform: translateY(-180%); padding: .75rem 1rem; border-radius: var(--xl-radius-sm);
    background: var(--xl-ink); color: #fff; text-decoration: none;
}
.xl-skip-link:focus { transform: translateY(0); }
.xl-page-anchor { position: absolute; inline-size: 1px; block-size: 1px; overflow: hidden; }

.xl-shell { width: min(100% - 2rem, var(--xl-content)); margin-inline: auto; }
.xl-page { padding-block: clamp(1.25rem, 3vw, 3rem); min-height: 65vh; }
.xl-page-header { display: grid; gap: .75rem; margin-block-end: 1.5rem; }
.xl-page-header h1 { margin: 0; font-size: clamp(1.75rem, 4vw, 3rem); line-height: 1.2; }
.xl-page-header p { margin: 0; color: var(--xl-muted); max-width: 70ch; line-height: 1.8; }
.xl-eyebrow { color: var(--xl-primary-600); font-weight: 800; letter-spacing: .03em; }
.xl-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); gap: 1rem; }
.xl-card { color: var(--xl-ink) !important; background: var(--xl-surface); border: 1px solid var(--xl-border); border-radius: var(--xl-radius-lg); box-shadow: var(--xl-shadow-sm); overflow: hidden; }
.xl-card__body { padding: clamp(1rem, 2vw, 1.5rem); }
.xl-card h2, .xl-card h3 { margin-block: 0 .5rem; color: var(--xl-ink) !important; }
.xl-card p { color: var(--xl-muted); line-height: 1.75; }
.xl-stack { display: grid; gap: 1rem; }
.xl-cluster { display: flex; align-items: center; flex-wrap: wrap; gap: .75rem; }
.xl-split { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(260px, .7fr); gap: 1.25rem; align-items: start; }

.xl-button { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; min-height: 44px; padding: .65rem 1rem; border: 1px solid transparent; border-radius: var(--xl-radius-sm); font-weight: 800; text-decoration: none; cursor: pointer; }
.xl-button--primary { color: #fff; background: var(--xl-primary-600); }
.xl-button--primary:hover { background: var(--xl-primary-700); }
.xl-button--secondary { color: var(--xl-primary-700); background: var(--xl-primary-50); border-color: var(--xl-primary-100); }
.xl-button--danger { color: #fff; background: var(--xl-danger); }
.xl-field { display: grid; gap: .4rem; }
.xl-field label { font-weight: 700; }
.xl-input, .xl-select { width: 100%; min-height: 46px; padding: .7rem .8rem; color: var(--xl-ink); background: #fff; border: 1px solid #cbd5e1; border-radius: var(--xl-radius-sm); }
.xl-badge { display: inline-flex; align-items: center; min-height: 28px; padding: .25rem .65rem; border-radius: 999px; color: var(--xl-primary-700) !important; background: var(--xl-primary-50) !important; font-size: .82rem; font-weight: 800; }
.xl-progress { inline-size: 100%; block-size: .65rem; overflow: hidden; border-radius: 999px; background: #e2e8f0; }
.xl-progress > span { display: block; block-size: 100%; inline-size: var(--progress, 0%); background: linear-gradient(90deg, var(--xl-primary-500), #06b6d4); }
.xl-state { padding: 1.5rem; border: 1px dashed #94a3b8; border-radius: var(--xl-radius-md); text-align: center; color: var(--xl-muted); background: #fff; }
.xl-state--error { border-color: #fca5a5; color: #991b1b; background: #fef2f2; }
.xl-skeleton { min-height: 80px; border-radius: var(--xl-radius-md); background: linear-gradient(90deg, #e2e8f0 25%, #f8fafc 50%, #e2e8f0 75%); background-size: 200% 100%; animation: xl-shimmer 1.4s infinite; }
@keyframes xl-shimmer { to { background-position: -200% 0; } }

.xl-stat { display: grid; gap: .25rem; padding: 1rem; background: #fff; border: 1px solid var(--xl-border); border-radius: var(--xl-radius-md); }
.xl-stat strong { font-size: 1.75rem; }
.xl-stat span { color: var(--xl-muted); }
.xl-review-word { font-size: clamp(2rem, 7vw, 4rem); font-weight: 900; text-align: center; direction: ltr; }
.xl-review-answer[hidden] { display: none; }
.xl-rating-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: .5rem; }
.xl-rating-grid button { border: 1px solid var(--xl-border); border-radius: var(--xl-radius-sm); background: #fff; cursor: pointer; }
.xl-rating-grid button:hover { border-color: var(--xl-primary-500); background: var(--xl-primary-50); }

.xl-learning-player { position: relative; background: #020617; color: #fff; border-radius: var(--xl-radius-lg); overflow: hidden; box-shadow: var(--xl-shadow-md); }
.xl-learning-player video, .xl-learning-player iframe { display: block; inline-size: 100%; block-size: auto; max-inline-size: 100%; max-block-size: 70vh; object-fit: contain; background: #000; }
.xl-player-controls { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; padding: .75rem; }
.xl-player-controls button, .xl-player-controls select, .xl-player-controls input { min-height: 44px; color: #fff; background: #1e293b; border: 1px solid #475569; border-radius: .6rem; padding-inline: .75rem; }
.xl-player-controls input[type="number"] { width: 5.5rem; text-align: center; }
.xl-sync-control { display: inline-flex; align-items: center; gap: .45rem; min-height: 44px; color: #e2e8f0; }
.xl-transcript { max-height: none; overflow: visible; overscroll-behavior: contain; }
.xl-segment { display: grid; gap: .45rem; width: 100%; padding: 1rem 1.05rem; border: 0; border-block-end: 1px solid var(--xl-border); background: #fff; text-align: start; cursor: pointer; }
.xl-segment:hover, .xl-segment.is-active { background: var(--xl-primary-50); }
.xl-segment__de { direction: ltr; text-align: left; font-size: 1.12rem; line-height: 1.75; font-weight: 800; }
.xl-segment__fa { color: var(--xl-muted); font-size: 1.04rem; line-height: 1.9; }
.xl-word { border-radius: .25rem; padding-inline: .1rem; transition: background-color .15s ease; }
.xl-word:hover, .xl-word:active { background: var(--xl-primary-100, #dbeafe); }

.xl-bottom-nav { display: none; }
@media (max-width: 900px) {
    body { padding-block-end: calc(76px + env(safe-area-inset-bottom)); }
    .xl-split { grid-template-columns: 1fr; }
    .xl-bottom-nav {
        position: fixed; z-index: 9500; inset-inline: 0; inset-block-end: 0; display: grid;
        grid-template-columns: repeat(5, 1fr); padding: .4rem max(.35rem, env(safe-area-inset-right)) calc(.4rem + env(safe-area-inset-bottom)) max(.35rem, env(safe-area-inset-left));
        background: rgba(255,255,255,.96); border-block-start: 1px solid var(--xl-border); backdrop-filter: blur(16px);
    }
    .xl-bottom-nav a { display: grid; place-items: center; gap: .15rem; min-height: 56px; padding: .2rem; color: #334155 !important; font-size: .72rem; font-weight: 800; text-decoration: none; opacity: 1 !important; }
    .xl-bottom-nav a i { font-size: 1.15rem; }
    .xl-bottom-nav a.active { color: var(--xl-primary-600) !important; }
    .xl-rating-grid { grid-template-columns: repeat(2, 1fr); }

    /* پلیر ویدئو در موبایل: چسبان به بالای صفحه هنگام اسکرول متن */
    .xl-learning-player { position: sticky; inset-block-start: 0; z-index: 40; }
    .xl-learning-player video, .xl-learning-player iframe { max-block-size: 42vh; }
    .xl-transcript { max-height: none; }

    /* ناحیه لمسی بزرگ‌تر برای کلیک روی هر کلمه و باز شدن دیکشنری */
    .xl-segment__de { line-height: 2.1; font-size: 1.05rem; }
    .xl-word { display: inline-block; padding-block: .15rem; }

    /* دکمه‌های لمسی برای تعویض زبان به‌جای select */
    .xl-subtitle-toggle { display: flex; gap: .4rem; width: 100%; }
    .xl-subtitle-toggle button {
        flex: 1; min-height: 44px; border: 1px solid var(--xl-border); border-radius: .6rem;
        background: #fff; font-weight: 700; font-size: .85rem; cursor: pointer;
    }
    .xl-subtitle-toggle button.is-active { background: var(--xl-primary-500); color: #fff; border-color: var(--xl-primary-500); }
    #subtitleMode { display: none; }
}

/* Overlay زیرنویس روی ویدئو در حالت Full Screen (موبایل افقی و غیره) */
.xl-transcript-overlay {
    display: flex; position: relative; z-index: 50;
    flex-direction: column; gap: .45rem; width: min(920px, 96%); margin-inline: auto;
    padding: .75rem 1rem;
    color: #fff; text-align: center; pointer-events: none;
    background: #020617;
}
.xl-learning-player:fullscreen .xl-transcript-overlay,
.xl-learning-player:-webkit-full-screen .xl-transcript-overlay {
    position: absolute; inset-inline: 0; inset-block-end: 0;
    padding: 1rem 1.25rem calc(1rem + env(safe-area-inset-bottom));
    background: transparent;
}
.xl-transcript-overlay::before {
    content: ''; position: absolute; inset: -1rem -2vw 0; z-index: -1;
    background: linear-gradient(to top, rgba(0,0,0,.78), rgba(0,0,0,.36) 72%, transparent);
}
.xl-transcript-overlay .xl-overlay-cue {
    display: grid; gap: .2rem; padding: .55rem .8rem; border: 1px solid rgba(148,163,184,.22);
    border-radius: .8rem; background: rgba(15,23,42,.72); box-shadow: 0 12px 34px rgba(0,0,0,.24);
    opacity: .66; transform: scale(.97);
}
.xl-transcript-overlay .xl-overlay-cue.is-current {
    padding: .78rem .95rem; border-color: rgba(96,165,250,.5); background: rgba(15,23,42,.94);
    opacity: 1; transform: none;
}
.xl-transcript-overlay .xl-segment__de { color: #fff; font-size: 1.2rem; line-height: 1.65; font-weight: 800; }
.xl-transcript-overlay .xl-segment__fa { color: #e2e8f0; font-size: 1.12rem; line-height: 1.85; }
.xl-transcript-overlay .xl-overlay-cue.is-current .xl-segment__de { font-size: 1.42rem; font-weight: 850; }
.xl-transcript-overlay .xl-overlay-cue.is-current .xl-segment__fa { font-size: 1.25rem; }
.xl-transcript-overlay .dict-inline-word { pointer-events: auto; }
.xl-learning-player:fullscreen, .xl-learning-player:-webkit-full-screen { position: relative; }
.xl-overlay-lang-toggle {
    display: none; position: absolute; inset-block-start: .75rem; inset-inline-end: .75rem; z-index: 51;
    gap: .35rem; pointer-events: auto;
}
.xl-learning-player:fullscreen .xl-overlay-lang-toggle,
.xl-learning-player:-webkit-full-screen .xl-overlay-lang-toggle { display: flex; }
.xl-overlay-lang-toggle button {
    min-height: 36px; padding-inline: .6rem; border: 1px solid rgba(255,255,255,.4); border-radius: .5rem;
    background: rgba(15,23,42,.6); color: #fff; font-size: .75rem; font-weight: 700; cursor: pointer;
}
.xl-overlay-lang-toggle button.is-active { background: var(--xl-primary-500); border-color: var(--xl-primary-500); }

@media (max-width: 640px) {
    .xl-transcript-overlay { gap: .35rem; width: min(100%, 96vw); padding-inline: .6rem; }
    .xl-transcript-overlay .xl-overlay-cue { padding: .42rem .6rem; border-radius: .6rem; line-height: 1.45; }
    .xl-transcript-overlay .xl-overlay-cue.is-current { padding: .58rem .7rem; }
    .xl-transcript-overlay .xl-overlay-cue.is-current .xl-segment__de { font-size: 1rem; }
}

@media (max-width: 390px) {
    .xl-shell { width: min(100% - 1rem, var(--xl-content)); }
    .xl-card__body { padding: .9rem; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

@media (prefers-color-scheme: dark) {
    body.xl-theme-auto { --xl-ink: #e2e8f0; --xl-muted: #94a3b8; --xl-surface: #0f172a; --xl-surface-soft: #020617; --xl-border: #334155; }
    body.xl-theme-auto .xl-card, body.xl-theme-auto .xl-state, body.xl-theme-auto .xl-stat { background: #0f172a; }
    body.xl-theme-auto .xl-input, body.xl-theme-auto .xl-select { color: #e2e8f0; background: #111827; border-color: #475569; }
}

/* Flashcard workspace */
.flashcard-stats { display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1rem }
.flashcard-stat-due { border-color:#f59e0b;background:#fffbeb }
.flashcard-toolbar,.flashcard-folder-head,.flashcard-dialog-head,.flashcard-filter { display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap }
.flashcard-folder-tabs { display:flex;gap:.65rem;overflow-x:auto;padding:.2rem .1rem .5rem;max-width:100% }
.flashcard-folder-tab { display:flex;align-items:center;gap:.45rem;min-width:max-content;padding:.7rem .9rem;color:#334155!important;background:#fff;border:1px solid var(--xl-border);border-radius:.8rem;text-decoration:none;font-weight:800 }
.flashcard-folder-tab i { color:var(--folder-color) }
.flashcard-folder-tab b { color:#64748b }
.flashcard-folder-tab em { min-width:1.5rem;padding:.1rem .4rem;border-radius:999px;color:#fff;background:#f59e0b;font-style:normal;text-align:center }
.flashcard-folder-tab.is-active { border-color:var(--folder-color);box-shadow:0 0 0 2px color-mix(in srgb,var(--folder-color) 18%,transparent) }
.flashcard-grid { display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:1rem }
.flashcard-item blockquote,.flashcard-context { margin:0;padding:.8rem 1rem;border-inline-start:4px solid #14b8a6;border-radius:.5rem;background:#f0fdfa;color:#134e4a;line-height:1.8 }
.flashcard-word { direction:ltr;text-align:left;font-size:1.55rem!important }
.flashcard-meanings { margin:0;padding-inline-start:1.25rem;line-height:1.9 }
.flashcard-review { border:2px solid #f59e0b;background:linear-gradient(145deg,#fff,#fffbeb) }
.flashcard-review .xl-review-answer { padding:1rem;border-radius:.8rem;background:#fff;border:1px solid #fde68a }
.flashcard-example { padding:.6rem .8rem;margin:.45rem 0;border-radius:.55rem;background:#f8fafc;border:1px solid #e2e8f0 }
.flashcard-example p { margin:0;color:#0f172a }
.flashcard-dialog { width:min(92vw,640px);max-height:90vh;overflow:auto;padding:1.25rem;border:0;border-radius:1rem;box-shadow:0 24px 70px rgba(15,23,42,.28);color:#0f172a;background:#fff }
.flashcard-dialog::backdrop { background:rgba(15,23,42,.62);backdrop-filter:blur(3px) }
.flashcard-dialog-head button { width:42px;height:42px;border:0;border-radius:50%;font-size:1.7rem;background:#f1f5f9;cursor:pointer }
.flashcard-dialog textarea.xl-input { min-height:90px;resize:vertical }
.flashcard-check { display:flex;align-items:center;gap:.45rem;min-height:46px }
.flashcard-filter .xl-field { flex:1 1 260px }
.form-status { min-height:1.5rem;color:#b45309 }
.xl-button:disabled { opacity:.5;cursor:not-allowed }
@media(max-width:900px){.flashcard-stats{grid-template-columns:repeat(2,minmax(0,1fr))}.flashcard-toolbar{align-items:stretch}.flashcard-toolbar>.xl-cluster{width:100%}.flashcard-toolbar .xl-button{flex:1}.flashcard-folder-head{align-items:flex-start}}
@media(max-width:480px){.flashcard-stats{grid-template-columns:1fr}.flashcard-dialog{width:96vw;padding:1rem}.flashcard-filter{align-items:stretch}.flashcard-filter .xl-button{width:100%}}