/* ============================================================
   NihonGo! — Vocabulary Browser Styles
   Premium dark-mode with glassmorphism & micro-animations
   ============================================================ */

/* ── Page Container ── */
.vocab-page {
    padding: 8px 0 40px;
    max-width: 1280px;
    margin: 0 auto;
    animation: vocabFadeIn 0.5s ease both;
}

@keyframes vocabFadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Stats Bar ── */
.vocab-stats-bar {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
    animation: vocabSlideUp 0.45s ease both 0.1s;
}

@keyframes vocabSlideUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

.stat-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
    cursor: default;
    white-space: nowrap;
}

.stat-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.25);
    border-color: rgba(255,255,255,0.12);
}

.stat-badge .stat-count {
    font-weight: 800;
    font-family: var(--font-display);
    font-size: 0.95rem;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-badge.stat-n5 { border-left: 3px solid var(--green); }
.stat-badge.stat-n3 { border-left: 3px solid var(--cyan); }
.stat-badge.stat-n2 { border-left: 3px solid var(--purple); }
.stat-badge.stat-dekiru { border-left: 3px solid var(--pink); }
.stat-badge.stat-mix { border-left: 3px solid var(--amber); }
.stat-badge.stat-total {
    background: linear-gradient(135deg, rgba(168,85,247,0.12), rgba(236,72,153,0.12));
    border: 1px solid rgba(168,85,247,0.25);
}

/* ── Search ── */
.vocab-search-wrap {
    position: relative;
    margin-bottom: 18px;
    animation: vocabSlideUp 0.45s ease both 0.15s;
}

.vocab-search-wrap .search-icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
    transition: color var(--transition-base);
}

.vocab-search {
    width: 100%;
    padding: 14px 18px 14px 48px;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: var(--font-primary);
    outline: none;
    transition: border-color var(--transition-base), box-shadow var(--transition-base), background var(--transition-base);
    box-sizing: border-box;
}

.vocab-search::placeholder {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.vocab-search:focus {
    border-color: var(--purple);
    box-shadow: 0 0 0 3px rgba(168,85,247,0.15), 0 4px 20px rgba(0,0,0,0.2);
    background: rgba(255,255,255,0.06);
}

.vocab-search:focus ~ .search-icon,
.vocab-search-wrap:focus-within .search-icon {
    color: var(--purple);
}

/* ── Tabs ── */
.vocab-tabs {
    display: flex;
    gap: 4px;
    overflow-x: auto;
    padding-bottom: 4px;
    margin-bottom: 16px;
    scrollbar-width: none;
    -ms-overflow-style: none;
    animation: vocabSlideUp 0.45s ease both 0.2s;
}

.vocab-tabs::-webkit-scrollbar { display: none; }

.vocab-tab {
    position: relative;
    padding: 10px 20px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.88rem;
    font-weight: 600;
    font-family: var(--font-primary);
    cursor: pointer;
    white-space: nowrap;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    transition: color var(--transition-fast), background var(--transition-fast);
}

.vocab-tab:hover {
    color: var(--text-secondary);
    background: rgba(255,255,255,0.03);
}

.vocab-tab.active {
    color: var(--text-primary);
    background: rgba(255,255,255,0.05);
}

.vocab-tab.active::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 3px;
    border-radius: 3px 3px 0 0;
    background: var(--gradient-main);
    animation: tabUnderline 0.3s ease both;
}

@keyframes tabUnderline {
    from { transform: scaleX(0); }
    to   { transform: scaleX(1); }
}

/* ── View Mode Bar ── */
.view-mode-bar {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    animation: vocabSlideUp 0.45s ease both 0.25s;
}

.view-btn {
    padding: 7px 14px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-muted);
    font-size: 0.82rem;
    font-weight: 600;
    font-family: var(--font-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.view-btn:hover {
    color: var(--text-secondary);
    border-color: rgba(255,255,255,0.15);
    background: rgba(255,255,255,0.03);
}

.view-btn.active {
    color: var(--text-primary);
    background: linear-gradient(135deg, rgba(168,85,247,0.15), rgba(236,72,153,0.1));
    border-color: rgba(168,85,247,0.35);
    box-shadow: 0 0 12px rgba(168,85,247,0.1);
}

.vocab-count {
    margin-left: auto;
    font-size: 0.82rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* ── Vocab Grid ── */
.vocab-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    animation: vocabGridIn 0.4s ease both;
}

@keyframes vocabGridIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* ── Vocab Card ── */
.vocab-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    animation: cardAppear 0.35s ease both;
    cursor: default;
    display: flex;
    flex-direction: column;
}

@keyframes cardAppear {
    from { opacity: 0; transform: translateY(10px) scale(0.97); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

.vocab-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 36px rgba(0,0,0,0.3), 0 0 0 1px rgba(168,85,247,0.1);
    border-color: rgba(255,255,255,0.12);
}

/* Card Header */
.vocab-card .card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.vocab-card .num-badge {
    font-size: 0.7rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 6px;
    background: rgba(168,85,247,0.12);
    color: var(--purple);
    font-family: var(--font-display);
    letter-spacing: 0.02em;
}

.vocab-card .pos-badge {
    font-size: 0.68rem;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: 6px;
    background: rgba(6,182,212,0.1);
    color: var(--cyan);
}

.vocab-card .level-badge {
    font-size: 0.68rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 6px;
    background: rgba(34,197,94,0.1);
    color: var(--green);
    margin-left: 4px;
}

/* Card Kanji */
.vocab-card .card-kanji {
    text-align: center;
    margin-bottom: 14px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--border);
}

.vocab-card .card-kanji .furigana {
    display: block;
    font-size: 0.78rem;
    color: var(--text-muted);
    margin-bottom: 2px;
    font-weight: 500;
}

.vocab-card .card-kanji .kanji-text {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: #d41e6b;
    line-height: 1.2;
    letter-spacing: -0.01em;
    transition: text-shadow var(--transition-base);
}

.vocab-card:hover .card-kanji .kanji-text {
    text-shadow: 0 0 20px rgba(212,30,107,0.3);
}

/* Card Meanings */
.vocab-card .card-meanings {
    flex: 1;
    margin-bottom: 10px;
}

.vocab-card .meaning-row {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 6px;
    font-size: 0.85rem;
    line-height: 1.5;
}

.vocab-card .meaning-row .lang-tag {
    flex-shrink: 0;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 2px;
}

.vocab-card .meaning-row .lang-tag.en {
    background: rgba(6,182,212,0.12);
    color: var(--cyan);
}

.vocab-card .meaning-row .lang-tag.bn {
    background: rgba(34,197,94,0.12);
    color: var(--green);
}

.vocab-card .meaning-row .meaning-text {
    color: var(--text-secondary);
}

/* Card Example (expandable) */
.vocab-card .card-example {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.35s ease, opacity 0.25s ease, padding 0.3s ease;
    background: rgba(255,255,255,0.02);
    border-radius: var(--radius-sm);
    padding: 0 12px;
    margin-top: 0;
}

.vocab-card.expanded .card-example {
    max-height: 300px;
    opacity: 1;
    padding: 12px;
    margin-top: 10px;
    border: 1px solid rgba(255,255,255,0.05);
}

.card-example .example-label {
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 6px;
}

.card-example .example-jp {
    font-size: 0.92rem;
    color: var(--amber);
    margin-bottom: 6px;
    line-height: 1.6;
    font-weight: 500;
}

.card-example .example-meaning {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: 3px;
}

/* Example Toggle Button */
.example-toggle-btn {
    width: 100%;
    padding: 7px;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text-muted);
    font-size: 0.75rem;
    font-weight: 600;
    font-family: var(--font-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-top: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.example-toggle-btn:hover {
    color: var(--text-secondary);
    border-color: rgba(255,255,255,0.15);
    background: rgba(255,255,255,0.03);
}

.example-toggle-btn .toggle-arrow {
    display: inline-block;
    transition: transform 0.3s ease;
}

.vocab-card.expanded .example-toggle-btn .toggle-arrow {
    transform: rotate(180deg);
}

/* ── List View ── */
.vocab-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    animation: vocabGridIn 0.4s ease both;
}

.vocab-list-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 20px;
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
    animation: cardAppear 0.3s ease both;
    cursor: default;
}

.vocab-list-item:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    border-color: rgba(255,255,255,0.12);
}

.vocab-list-item .list-num {
    flex-shrink: 0;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 6px;
    background: rgba(168,85,247,0.12);
    color: var(--purple);
    font-family: var(--font-display);
    min-width: 32px;
    text-align: center;
}

.vocab-list-item .list-kanji {
    flex-shrink: 0;
    font-size: 1.5rem;
    font-weight: 800;
    color: #d41e6b;
    min-width: 80px;
}

.vocab-list-item .list-reading {
    font-size: 0.8rem;
    color: var(--text-muted);
    flex-shrink: 0;
    min-width: 80px;
}

.vocab-list-item .list-meanings {
    flex: 1;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.vocab-list-item .list-meanings .bn-meaning {
    color: var(--green);
    font-size: 0.82rem;
}

.vocab-list-item .list-pos {
    flex-shrink: 0;
    font-size: 0.68rem;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: 6px;
    background: rgba(6,182,212,0.1);
    color: var(--cyan);
}

.vocab-list-item .list-level {
    flex-shrink: 0;
    font-size: 0.68rem;
    font-weight: 700;
    padding: 3px 8px;
    border-radius: 6px;
    background: rgba(34,197,94,0.1);
    color: var(--green);
}

/* ── Flashcard Mode ── */
.flashcard-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    animation: vocabGridIn 0.4s ease both;
}

.flashcard-wrapper {
    perspective: 1200px;
    width: 100%;
    max-width: 420px;
    height: 380px;
    margin-bottom: 24px;
}

.flashcard {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.flashcard.flipped {
    transform: rotateY(180deg);
}

.flashcard-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 32px;
    border-radius: var(--radius-xl);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    box-shadow: 0 8px 40px rgba(0,0,0,0.3);
    text-align: center;
    overflow-y: auto;
}

.flashcard-front {
    background: linear-gradient(160deg, rgba(168,85,247,0.06), rgba(236,72,153,0.04), rgba(6,182,212,0.04));
}

.flashcard-back {
    transform: rotateY(180deg);
    background: linear-gradient(160deg, rgba(6,182,212,0.06), rgba(34,197,94,0.04), rgba(168,85,247,0.04));
}

.flashcard-front .fc-reading {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    font-weight: 500;
}

.flashcard-front .fc-kanji {
    font-size: 4rem;
    font-weight: 900;
    color: #d41e6b;
    margin-bottom: 16px;
    line-height: 1.1;
    text-shadow: 0 0 30px rgba(212,30,107,0.2);
}

.flashcard-front .fc-pos {
    font-size: 0.78rem;
    padding: 4px 12px;
    border-radius: 20px;
    background: rgba(6,182,212,0.1);
    color: var(--cyan);
    font-weight: 600;
}

.flashcard-front .fc-hint {
    position: absolute;
    bottom: 20px;
    font-size: 0.75rem;
    color: var(--text-muted);
    opacity: 0.6;
}

.flashcard-back .fc-label {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 4px;
    color: var(--text-muted);
}

.flashcard-back .fc-en {
    font-size: 1.2rem;
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.4;
}

.flashcard-back .fc-bn {
    font-size: 1.1rem;
    color: var(--green);
    font-weight: 600;
    margin-bottom: 20px;
    line-height: 1.4;
}

.flashcard-back .fc-example-jp {
    font-size: 0.9rem;
    color: var(--amber);
    font-weight: 500;
    margin-bottom: 6px;
    line-height: 1.5;
}

.flashcard-back .fc-example-meaning {
    font-size: 0.82rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin-bottom: 4px;
}

/* Flashcard Navigation */
.flashcard-nav {
    display: flex;
    align-items: center;
    gap: 16px;
}

.fc-nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border: 1px solid var(--border);
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-radius: 50%;
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.fc-nav-btn:hover {
    background: rgba(168,85,247,0.12);
    border-color: rgba(168,85,247,0.3);
    color: var(--text-primary);
    transform: scale(1.08);
}

.fc-nav-btn:active {
    transform: scale(0.95);
}

.fc-counter {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 600;
    font-family: var(--font-display);
    min-width: 80px;
    text-align: center;
}

.fc-counter .current {
    color: var(--text-primary);
    font-size: 1.1rem;
}

/* ── Pagination ── */
.vocab-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 32px;
    flex-wrap: wrap;
    animation: vocabSlideUp 0.4s ease both;
}

.page-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 38px;
    height: 38px;
    padding: 0 6px;
    border: 1px solid var(--border);
    background: var(--glass-bg);
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 600;
    font-family: var(--font-display);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.page-btn:hover {
    color: var(--text-secondary);
    border-color: rgba(255,255,255,0.15);
    background: rgba(255,255,255,0.05);
    transform: translateY(-1px);
}

.page-btn.active {
    background: linear-gradient(135deg, var(--purple), var(--pink));
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 16px rgba(168,85,247,0.3);
}

.page-btn.active:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(168,85,247,0.4);
}

.page-btn.disabled {
    opacity: 0.35;
    pointer-events: none;
}

.page-ellipsis {
    color: var(--text-muted);
    font-size: 0.85rem;
    padding: 0 4px;
    user-select: none;
}

/* ── Empty State ── */
.vocab-empty {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
    animation: vocabFadeIn 0.4s ease both;
}

.vocab-empty .empty-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    display: block;
    opacity: 0.5;
}

.vocab-empty .empty-text {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.vocab-empty .empty-sub {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
    .vocab-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 14px;
    }

    .flashcard-wrapper {
        max-width: 380px;
        height: 350px;
    }
}

@media (max-width: 768px) {
    .vocab-page {
        padding: 4px 0 32px;
    }

    .vocab-stats-bar {
        gap: 8px;
    }

    .stat-badge {
        padding: 6px 12px;
        font-size: 0.78rem;
    }

    .vocab-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .vocab-card {
        padding: 16px;
    }

    .vocab-card .card-kanji .kanji-text {
        font-size: 2rem;
    }

    .vocab-list-item {
        flex-wrap: wrap;
        gap: 8px;
        padding: 12px 14px;
    }

    .vocab-list-item .list-reading,
    .vocab-list-item .list-pos,
    .vocab-list-item .list-level {
        display: none;
    }

    .flashcard-wrapper {
        max-width: 340px;
        height: 320px;
    }

    .flashcard-front .fc-kanji {
        font-size: 3rem;
    }

    .view-mode-bar {
        gap: 4px;
    }

    .view-btn {
        padding: 6px 10px;
        font-size: 0.78rem;
    }
}

@media (max-width: 480px) {
    .vocab-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .vocab-card .card-kanji .kanji-text {
        font-size: 2.2rem;
    }

    .vocab-tabs {
        gap: 2px;
    }

    .vocab-tab {
        padding: 8px 14px;
        font-size: 0.82rem;
    }

    .vocab-search {
        padding: 12px 14px 12px 42px;
        font-size: 0.88rem;
    }

    .flashcard-wrapper {
        max-width: 100%;
        height: 300px;
    }

    .flashcard-front .fc-kanji {
        font-size: 2.5rem;
    }

    .flashcard-back .fc-en {
        font-size: 1rem;
    }

    .flashcard-back .fc-bn {
        font-size: 0.95rem;
    }

    .vocab-pagination {
        gap: 4px;
    }

    .page-btn {
        min-width: 34px;
        height: 34px;
        font-size: 0.8rem;
    }

    .vocab-list-item .list-kanji {
        font-size: 1.2rem;
        min-width: unset;
    }

    .vocab-list-item .list-num {
        font-size: 0.65rem;
        padding: 3px 7px;
    }
}

/* ── Stagger animation delays for cards ── */
.vocab-card:nth-child(1), .vocab-list-item:nth-child(1)  { animation-delay: 0.02s; }
.vocab-card:nth-child(2), .vocab-list-item:nth-child(2)  { animation-delay: 0.04s; }
.vocab-card:nth-child(3), .vocab-list-item:nth-child(3)  { animation-delay: 0.06s; }
.vocab-card:nth-child(4), .vocab-list-item:nth-child(4)  { animation-delay: 0.08s; }
.vocab-card:nth-child(5), .vocab-list-item:nth-child(5)  { animation-delay: 0.10s; }
.vocab-card:nth-child(6), .vocab-list-item:nth-child(6)  { animation-delay: 0.12s; }
.vocab-card:nth-child(7), .vocab-list-item:nth-child(7)  { animation-delay: 0.14s; }
.vocab-card:nth-child(8), .vocab-list-item:nth-child(8)  { animation-delay: 0.16s; }
.vocab-card:nth-child(9), .vocab-list-item:nth-child(9)  { animation-delay: 0.18s; }
.vocab-card:nth-child(10), .vocab-list-item:nth-child(10) { animation-delay: 0.20s; }
.vocab-card:nth-child(11), .vocab-list-item:nth-child(11) { animation-delay: 0.22s; }
.vocab-card:nth-child(12), .vocab-list-item:nth-child(12) { animation-delay: 0.24s; }