/* Dashboard Mew 🐱 — Korean Learning - v2 Sidebar Layout */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;700;900&family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --bg:           #f4f5f8;
    --bg-card:      #ffffff;
    --bg-card-alt:  #eef0f4;
    --bg-hover:     #e7eaf0;
    --border:       #e0e3ea;
    --text:         #15171f;
    --text-dim:     #6b7080;
    --text-muted:   #9aa0b0;
    --accent:       #0047a0;
    --accent-dim:   #4d7cc7;
    --accent-glow:  rgba(0,71,160,0.08);
    --green:        #16a34a;
    --orange:       #d97706;
    --red:          #cd2e3a;
    --radius:       12px;
    --radius-sm:    8px;
    --radius-xs:    6px;
    --shadow:       0 4px 24px rgba(0,0,0,0.06);
    --transition:   all 0.25s cubic-bezier(.4,0,.2,1);
    --sidebar-w:    260px;
}

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

body {
    font-family:'Inter','Noto Sans KR',system-ui,sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

/* Scrollbar */
::-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(--accent-dim); }

/* ================================================================
   SIDEBAR
   ================================================================ */
.sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    width: var(--sidebar-w);
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(24px);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 200;
    transition: transform 0.3s cubic-bezier(.4,0,.2,1);
}

.sidebar-header {
    padding: 1.5rem 1.25rem;
    border-bottom: 1px solid var(--border);
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text);
}

.sidebar-logo {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    object-fit: cover;
}

.sidebar-title {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--accent);
    letter-spacing: -0.02em;
}

.sidebar-nav {
    flex: 1;
    padding: 1rem 0.75rem;
    overflow-y: auto;
}

.nav-section-label {
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--text-muted);
    padding: 0.75rem 0.75rem 0.5rem;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--text-dim);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    margin-bottom: 2px;
}

.sidebar-link:hover {
    color: var(--text);
    background: var(--bg-hover);
}

.sidebar-link.active {
    color: var(--accent);
    background: var(--accent-glow);
    font-weight: 600;
}

.sidebar-icon {
    font-size: 1.15rem;
    width: 24px;
    text-align: center;
    flex-shrink: 0;
}

.sidebar-sub {
    margin-left: 1rem;
    padding-left: 0.75rem;
    border-left: 2px solid var(--border);
    margin-bottom: 0.5rem;
}

.sidebar-sub .sidebar-link {
    font-size: 0.82rem;
    padding: 7px 12px;
    color: var(--text-muted);
}

.sidebar-sub .sidebar-link:hover {
    color: var(--text-dim);
}

.sidebar-sub .sidebar-link.active {
    color: var(--accent);
    border-left: none;
}

.sidebar-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border);
}

.sidebar-footer-text {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.sidebar-footer-text .kr {
    font-family: 'Noto Sans KR';
    font-weight: 500;
    color: var(--text-dim);
}

/* Sidebar overlay for mobile */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    z-index: 150;
}

/* ================================================================
   TOPBAR (mobile only)
   ================================================================ */
.topbar {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 56px;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 0 1rem;
    align-items: center;
    gap: 12px;
    z-index: 100;
}

.topbar-toggle {
    width: 36px; height: 36px;
    display: flex; flex-direction: column;
    justify-content: center; align-items: center;
    gap: 5px;
    background: none; border: none;
    cursor: pointer;
    padding: 6px;
}

.topbar-toggle span {
    display: block;
    width: 20px; height: 2px;
    background: var(--text-dim);
    border-radius: 2px;
    transition: var(--transition);
}

.topbar-toggle:hover span {
    background: var(--accent);
}

.topbar-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 1.1rem;
}

.topbar-brand span {
    color: var(--accent);
}

.topbar-logo {
    width: 30px;
    height: 30px;
    border-radius: 6px;
    object-fit: cover;
}

/* ================================================================
   MAIN CONTENT
   ================================================================ */
.main-wrap {
    margin-left: var(--sidebar-w);
    min-height: 100vh;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2.5rem 2.5rem 4rem;
}

/* ================================================================
   HERO (used on home / lessons)
   ================================================================ */
.hero { margin-bottom: 2.5rem; }
.hero h1 { font-size: 2.2rem; font-weight: 900; margin-bottom: 0.4rem; }
.hero h1 .kr { font-family:'Noto Sans KR'; }
.hero .subtitle { color:var(--text-dim); font-size:1rem; }

/* ================================================================
   BOOKS GRID (Vocab home)
   ================================================================ */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
}

.book-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
    text-decoration: none;
    color: var(--text);
    display: block;
}

.book-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--accent);
}

.book-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow), 0 0 30px var(--accent-glow);
    border-color: var(--accent-dim);
}

.book-level {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.75rem;
}

.book-level.l3 { background: rgba(22,163,74,0.12); color: var(--green); }
.book-level.l4 { background: rgba(0,71,160,0.10); color: var(--accent); }

.book-title { font-size: 1.35rem; font-weight: 700; margin-bottom: 0.65rem; }

.book-stats { display: flex; gap: 1.5rem; }
.book-stat { display: flex; flex-direction: column; }
.book-stat-value { font-size: 1.4rem; font-weight: 700; color: var(--accent); }
.book-stat-label { font-size: 0.72rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.5px; }


/* ================================================================
   VOCAB PAGE
   ================================================================ */
.vocab-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}
.vocab-title-group h1 { font-size: 2rem; font-weight: 800; }
.vocab-title-group .breadcrumb { color: var(--text-dim); font-size: 0.875rem; }
.vocab-title-group .breadcrumb a { color: var(--accent); text-decoration: none; }
.vocab-title-group .breadcrumb a:hover { text-decoration: underline; }

/* Chapter pills */
.chapter-nav {
    display: flex; gap: 8px; flex-wrap: wrap;
    margin-bottom: 2rem; padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}
.ch-pill {
    padding: 8px 18px;
    border-radius: 20px;
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text-dim);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}
.ch-pill:hover { border-color: var(--accent-dim); color: var(--text); background: var(--bg-hover); }
.ch-pill.active {
    background: var(--accent);
    border-color: transparent; color: #fff; font-weight: 600;
    box-shadow: 0 2px 12px rgba(0,71,160,0.25);
}
.ch-pill .count {
    display: inline-block; margin-left: 6px; padding: 2px 8px;
    border-radius: 10px; font-size: 0.7rem; font-weight: 600;
    background: rgba(255,255,255,0.15);
}

/* Flashcard chapter+week picker */
.fc-chapters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.25rem;
    margin-top: 16px;
}
.fc-chapter-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem 1.4rem 1.5rem;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}
.fc-chapter-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: var(--accent);
}
.fc-chapter-card:hover {
    box-shadow: var(--shadow), 0 0 30px var(--accent-glow);
    border-color: var(--accent-dim);
}
.fc-chapter-card-head {
    display: flex; justify-content: space-between; align-items: baseline;
    margin-bottom: 0.7rem;
}
.fc-chapter-card-head h3 { font-size: 1.3rem; font-weight: 800; }
.fc-chapter-count { font-size: 0.78rem; color: var(--text-dim); font-weight: 600; white-space: nowrap; }

/* Mini stacked bar showing green/orange/red/non-évalué proportions */
.mastery-bar {
    display: flex; height: 6px; border-radius: 4px; overflow: hidden;
    background: var(--border); margin-bottom: 1rem;
}
.mastery-bar span { display: block; }

.fc-chapter-all-btn {
    display: block; text-align: center;
    padding: 9px 14px; border-radius: var(--radius-sm);
    background: var(--accent-glow); color: var(--accent);
    font-weight: 600; font-size: 0.85rem; text-decoration: none;
    margin-bottom: 1.1rem; transition: var(--transition);
}
.fc-chapter-all-btn:hover { background: var(--accent); color: #fff; }

.fc-week-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(58px, 1fr)); gap: 8px;
}
.fc-week-chip {
    display: flex; flex-direction: column; align-items: center; gap: 5px;
    padding: 9px 4px 7px; border-radius: var(--radius-sm);
    border: 1px solid var(--border); background: var(--bg);
    text-decoration: none; color: var(--text);
    transition: var(--transition);
}
.fc-week-chip:hover { border-color: var(--accent-dim); background: var(--bg-hover); transform: translateY(-2px); }
.fc-week-num { font-weight: 700; font-size: 0.85rem; }
.fc-week-count { font-size: 0.62rem; color: var(--text-muted); }
.fc-week-chip .mastery-bar { width: 100%; height: 4px; margin: 0; }

/* Search & controls */
.controls {
    display: flex; gap: 12px; align-items: center;
    margin-bottom: 1.5rem; flex-wrap: wrap;
}
.search-box { flex: 1; min-width: 250px; position: relative; }
.search-box input {
    width: 100%; padding: 12px 16px 12px 44px;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-sm); color: var(--text);
    font-size: 0.9rem; outline: none; transition: var(--transition);
}
.search-box input::placeholder { color: var(--text-muted); }
.search-box input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.search-box .icon {
    position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
    color: var(--text-muted); font-size: 1rem;
}
.toggle-btn {
    padding: 10px 18px; border-radius: var(--radius-sm);
    border: 1px solid var(--border); background: var(--bg-card);
    color: var(--text-dim); font-size: 0.85rem;
    cursor: pointer; transition: var(--transition);
}
.toggle-btn:hover { border-color: var(--accent-dim); color: var(--text); }
.toggle-btn.active { background: var(--accent-glow); border-color: var(--accent); color: var(--accent); }

/* Word count */
.word-counter { font-size: 0.85rem; color: var(--text-dim); margin-bottom: 1rem; }
.word-counter strong { color: var(--accent); }

/* === VOCAB TABLE === */
.vocab-table-wrap {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}
.vocab-table { width: 100%; border-collapse: collapse; }
.vocab-table thead th {
    padding: 14px 16px; text-align: left;
    background: var(--bg-card-alt);
    font-size: 0.75rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.8px;
    color: var(--text-dim);
    border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 2;
}
.vocab-table tbody tr {
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
    cursor: pointer;
}
.vocab-table tbody tr:hover { background: var(--bg-hover); }
.vocab-table tbody tr:last-child { border-bottom: none; }
.vocab-table td {
    padding: 14px 16px; vertical-align: top; font-size: 0.9rem;
}

/* Columns */
.col-hangul {
    font-family: 'Noto Sans KR', sans-serif;
    font-weight: 700; font-size: 1.1rem;
    color: var(--text); min-width: 140px;
}
.col-french { color: var(--text); min-width: 160px; }
.col-example {
    font-family: 'Noto Sans KR', sans-serif;
    font-size: 0.85rem; color: var(--text-dim);
}
.col-translated { font-size: 0.85rem; color: var(--text-muted); font-style: italic; }
.col-explanation {
    font-size: 0.8rem; color: var(--text-dim); max-width: 300px;
}

/* Expanded row */
.vocab-table tbody tr.expanded { background: var(--bg-card-alt); }
.detail-row-inner {
    padding: 16px 20px;
    background: var(--bg-card-alt);
    border-bottom: 2px solid var(--accent-dim);
}
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.detail-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.8px; color: var(--text-muted); margin-bottom: 4px; }
.detail-value { font-size: 0.9rem; color: var(--text); }
.detail-value.kr { font-family: 'Noto Sans KR'; font-size: 1rem; font-weight: 500; }

/* Chapter separator in table */
.chapter-sep td {
    padding: 20px 16px 10px;
    font-weight: 700; font-size: 1rem;
    color: var(--accent);
    background: var(--bg) !important;
    border-bottom: 2px solid var(--accent-dim) !important;
    cursor: default !important;
}
.chapter-sep:hover { background: var(--bg) !important; }

/* Stats bar */
.stats-bar { display: flex; gap: 1.25rem; margin-bottom: 2rem; flex-wrap: wrap; }
.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1.1rem 1.3rem;
    flex: 1; min-width: 130px;
}
.stat-value { font-size: 1.6rem; font-weight: 800; }
.stat-value.purple { color: var(--accent); }
.stat-value.pink { color: var(--text); }
.stat-value.cyan { color: var(--text); }
.stat-value.green { color: var(--green); }
.stat-label { font-size: 0.72rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.5px; margin-top: 2px; }


/* ================================================================
   LESSONS PAGE
   ================================================================ */
.lessons-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.lesson-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
    text-decoration: none;
    color: var(--text);
    display: block;
}

.lesson-card:hover {
    border-color: var(--accent-dim);
    box-shadow: 0 4px 20px rgba(0,0,0,0.06), 0 0 24px var(--accent-glow);
    transform: translateX(4px);
}

.lesson-card-inner {
    display: flex;
    align-items: stretch;
}

.lesson-card-accent {
    width: 4px;
    flex-shrink: 0;
    background: var(--accent);
    border-radius: 4px 0 0 4px;
}

.lesson-card-content {
    flex: 1;
    padding: 1.25rem 1.5rem;
}

.lesson-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 0.5rem;
}

.lesson-card-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px; height: 36px;
    border-radius: 10px;
    background: var(--accent-glow);
    color: var(--accent);
    font-weight: 700;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.lesson-card-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
}

.lesson-card-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 10px;
    margin-top: 0.6rem;
    padding-top: 0.6rem;
    border-top: 1px solid var(--border);
}

.topic-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: var(--radius-xs);
    background: var(--bg-card-alt);
    border: 1px solid var(--border);
    font-size: 0.78rem;
    color: var(--text-dim);
    transition: var(--transition);
    font-family: 'Inter', 'Noto Sans KR', sans-serif;
}

.lesson-card:hover .topic-tag {
    border-color: rgba(0,71,160,0.2);
    color: var(--text);
}

.topic-tag .topic-num {
    color: var(--accent);
    font-weight: 600;
    margin-right: 2px;
}

.topic-tag .topic-text {
    color: var(--text-dim);
}

.lesson-card:hover .topic-tag .topic-text {
    color: var(--text);
}

.lesson-card-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 1.25rem;
    color: var(--text-muted);
    font-size: 1.1rem;
    transition: var(--transition);
}

.lesson-card:hover .lesson-card-arrow {
    color: var(--accent);
    transform: translateX(4px);
}

/* Level group */
.level-group {
    margin-bottom: 2.5rem;
}

.level-group-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 1.25rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.level-group-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px; height: 40px;
    border-radius: 10px;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.level-group-icon.l3 { background: rgba(22,163,74,0.10); }
.level-group-icon.l4 { background: rgba(0,71,160,0.08); }

.level-group-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
}

.level-group-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.level-group-badge.l3 { background: rgba(22,163,74,0.12); color: var(--green); }
.level-group-badge.l4 { background: rgba(0,71,160,0.10); color: var(--accent); }

.empty-state {
    color: var(--text-dim);
    font-style: italic;
    padding: 1.5rem;
    text-align: center;
    background: var(--bg-card);
    border: 1px dashed var(--border);
    border-radius: var(--radius);
}


/* ================================================================
   RESPONSIVE
   ================================================================ */
@media (max-width: 900px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .sidebar-overlay.open {
        display: block;
    }
    .topbar {
        display: flex;
    }
    .main-wrap {
        margin-left: 0;
    }
    main {
        padding: 5rem 1.25rem 3rem;
    }
    .hero h1 { font-size: 1.6rem; }
    .books-grid { grid-template-columns: 1fr; }
    .detail-grid { grid-template-columns: 1fr; }
    .stats-bar { flex-direction: column; }
    .vocab-table td, .vocab-table th { padding: 10px 12px; }
    .col-explanation, .col-translated { display: none; }
    .lesson-card-arrow { display: none; }
    .lesson-card-content { padding: 1rem 1.25rem; }
}

@media (max-width: 480px) {
    main { padding: 4.5rem 0.75rem 2rem; }
    .topic-tag { font-size: 0.72rem; padding: 3px 8px; }
}

/* ================================================================
   YOUTUBE FEED
   ================================================================ */
.yt-channel-section { margin-bottom: 2.5rem; }
.yt-channel-title { font-size: 1.1rem; font-weight: 700; margin-bottom: 1rem; }

.yt-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
}

.yt-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}
.yt-card:hover { border-color: var(--accent-dim); box-shadow: var(--shadow), 0 0 30px var(--accent-glow); }

.yt-thumb-wrap {
    position: relative;
    aspect-ratio: 16 / 9;
    background: #000;
    cursor: pointer;
    overflow: hidden;
}
.yt-thumb { width: 100%; height: 100%; object-fit: cover; display: block; }

.yt-play-btn {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    background: rgba(0,0,0,0.25); color: #fff; opacity: 0;
    transition: var(--transition);
}
.yt-thumb-wrap:hover .yt-play-btn { opacity: 1; background: rgba(0,0,0,0.4); }
.yt-play-btn i { width: 48px; height: 48px; filter: drop-shadow(0 2px 6px rgba(0,0,0,.5)); }

.yt-embed-wrap iframe { width: 100%; height: 100%; border: none; display: block; }

.yt-info { padding: 0.9rem 1.1rem; }
.yt-title {
    font-size: 0.92rem; font-weight: 600; line-height: 1.35;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
    margin-bottom: 0.4rem;
}
.yt-meta { font-size: 0.78rem; color: var(--text-dim); }

.yt-more-btn { margin-top: 1rem; }
.yt-extra { display: none; }
.yt-extra.show { display: block; }

@media (max-width: 768px) {
    .yt-grid { grid-template-columns: 1fr; }
}

/* Lucide Icon sizes */
.lucide {
    display: inline-block;
    vertical-align: middle;
}
.icon-sm {
    width: 1.15rem;
    height: 1.15rem;
}
.icon-xs {
    width: 0.95rem;
    height: 0.95rem;
}

/* ================================================================
   LEVEL DOT (knowledge indicator per vocab row)
   ================================================================ */
.col-level {
    text-align: center;
    padding: 0 8px !important;
    vertical-align: middle !important;
    cursor: pointer;
    width: 38px;
}

.level-dot {
    display: inline-block;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: transparent;
    border: 2px solid var(--border);
    transition: background 0.2s ease, box-shadow 0.2s ease, transform 0.15s ease;
    cursor: pointer;
    vertical-align: middle;
}

.col-level:hover .level-dot {
    transform: scale(1.35);
    border-color: var(--text-muted);
}

.vocab-row[data-level="green"]  .level-dot { border-color: var(--green); }
.vocab-row[data-level="orange"] .level-dot { border-color: var(--orange); }
.vocab-row[data-level="red"]    .level-dot { border-color: var(--red); }

/* ================================================================
   ADD WORD BUTTON (in chapter separator row)
   ================================================================ */
.chapter-sep-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.add-word-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 12px;
    border-radius: var(--radius-xs);
    border: 1px solid var(--accent-dim);
    background: var(--accent-glow);
    color: var(--accent);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-left: auto;
}

.add-word-btn:hover {
    background: var(--accent-dim);
    color: #fff;
    border-color: var(--accent);
    box-shadow: 0 0 10px var(--accent-glow);
}

/* ================================================================
   LEVEL FILTER BAR
   ================================================================ */
.level-filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 1rem;
    padding: 12px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}

.lvl-filter-btn {
    padding: 6px 14px;
    border-radius: 20px;
    border: 1px solid var(--border);
    background: var(--bg-card-alt);
    color: var(--text-dim);
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}
.lvl-filter-btn:hover { border-color: var(--accent-dim); color: var(--text); }
.lvl-filter-btn.active { background: var(--accent-glow); border-color: var(--accent); color: var(--accent); font-weight: 600; }

/* ================================================================
   ADD WORD MODAL
   ================================================================ */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(6px);
    z-index: 400;
    opacity: 0;
    transition: opacity 0.25s ease;
}
.modal-overlay.open {
    display: block;
    opacity: 1;
}

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -52%) scale(0.96);
    z-index: 500;
    width: min(560px, 94vw);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.25), 0 0 40px var(--accent-glow);
    padding: 1.75rem 2rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, transform 0.25s cubic-bezier(.34,1.56,.64,1);
}
.modal.open {
    opacity: 1;
    pointer-events: all;
    transform: translate(-50%, -50%) scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.4rem;
}
.modal-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
}
.modal-subtitle {
    font-size: 0.82rem;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 1.4rem;
}
.modal-close {
    width: 32px; height: 32px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: var(--bg-card-alt);
    color: var(--text-dim);
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: var(--transition);
}
.modal-close:hover { border-color: var(--red); color: var(--red); }

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-bottom: 1.5rem;
}
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group-full { grid-column: 1 / -1; }
.form-label { font-size: 0.78rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-dim); }
.form-label .required { color: var(--red); margin-left: 2px; }

.form-input {
    padding: 10px 14px;
    background: var(--bg-card-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    color: var(--text);
    font-size: 0.9rem;
    font-family: inherit;
    outline: none;
    transition: var(--transition);
}
.form-input::placeholder { color: var(--text-muted); }
.form-input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.form-textarea { resize: vertical; min-height: 72px; }

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}
.btn-primary {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 10px 22px;
    border-radius: var(--radius-sm);
    border: none;
    background: var(--accent);
    color: #fff;
    font-size: 0.9rem; font-weight: 600;
    cursor: pointer; transition: var(--transition);
}
.btn-primary:hover { opacity: 0.88; box-shadow: 0 4px 14px var(--accent-glow); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--bg-card-alt);
    color: var(--text-dim);
    font-size: 0.9rem; font-weight: 500;
    cursor: pointer; transition: var(--transition);
}
.btn-secondary:hover { border-color: var(--text-dim); color: var(--text); }

.modal-success {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    background: rgba(22, 163, 74, 0.1);
    border: 1px solid rgba(22, 163, 74, 0.3);
    color: var(--green);
    font-weight: 500;
    margin-top: 0.5rem;
}

@media (max-width: 480px) {
    .form-grid { grid-template-columns: 1fr; }
    .modal { padding: 1.25rem 1.25rem; }
}