/* ============================================
   Kanji — Level filter + card grid
   ============================================ */

:root {
    --green: #6DBE45;
    --green-dark: #5aa83a;
    --green-light: #f0fae8;
}

.kanji-hero {
    padding: 36px 0 24px;
}

/* ===== Level Tabs ===== */

.kanji-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.kanji-tab {
    background: var(--bg-card, #fff);
    border: 2px solid var(--border-soft, #e5e7eb);
    border-radius: 14px;
    padding: 10px 20px;
    font-weight: 800;
    font-size: 1rem;
    color: var(--text-muted, #64748b);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.kanji-tab:hover {
    border-color: var(--accent-green, #16a34a);
    color: var(--accent-green, #16a34a);
    background: var(--accent-green-bg, #f0fdf4);
}

.kanji-tab.active {
    background: var(--accent-green, #16a34a);
    color: #fff;
    border-color: var(--accent-green, #16a34a);
    box-shadow: 0 6px 20px rgba(22, 163, 74, 0.3);
}

.tab-count {
    font-size: 0.78rem;
    font-weight: 700;
    background: var(--bg-card-hover, rgba(0, 0, 0, 0.08));
    border-radius: 999px;
    padding: 2px 8px;
    min-width: 28px;
    text-align: center;
    color: var(--text-muted);
}

.kanji-tab.active .tab-count {
    background: rgba(255, 255, 255, 0.25);
    color: #fff;
}

/* ===== Kanji Card ===== */

.kanji-card {
    background: var(--bg-card, #fffdf8);
    border: 1px solid var(--border-soft, #e5e7eb);
    border-radius: 20px;
    padding: 20px 14px;
    text-align: center;
    box-shadow: var(--shadow-card, 0 10px 28px rgba(15, 23, 42, 0.07));
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    height: 100%;
}

.kanji-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-card-hover, 0 18px 44px rgba(15, 23, 42, 0.13));
    border-color: var(--accent-green, #16a34a);
}

.kanji-char {
    font-family: 'Zen Maru Gothic', 'Noto Sans JP', serif;
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--text-main, #172033);
    line-height: 1.2;
    margin-bottom: 6px;
}

.kanji-reading {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.88rem;
    color: var(--accent-green, #16a34a);
    font-weight: 700;
    margin-bottom: 4px;
}

.kanji-word {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.82rem;
    color: var(--text-soft, #334155);
    font-weight: 600;
    margin-bottom: 4px;
}

.kanji-meaning {
    font-size: 0.8rem;
    color: var(--text-muted, #64748b);
    line-height: 1.4;
}

.kanji-grade {
    display: inline-block;
    margin-top: 8px;
    font-size: 0.7rem;
    font-weight: 800;
    background: var(--info-bg, #f0f9ff);
    color: var(--info-text, #1d4ed8);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 999px;
    padding: 2px 10px;
}

/* ===== N3 Flashcard Section ===== */

.flashcard-header h3 {
    color: var(--text-main, #172033);
    font-weight: 900;
}

.flashcard-filter-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.flashcard-filter-tab {
    background: var(--bg-card, #fff);
    border: 2px solid var(--border-soft, #e5e7eb);
    border-radius: 12px;
    padding: 8px 16px;
    font-weight: 800;
    font-size: 0.88rem;
    color: var(--text-muted, #64748b);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 6px;
}

.flashcard-filter-tab:hover {
    border-color: var(--accent-green, #16a34a);
    color: var(--accent-green, #16a34a);
    background: var(--green-light, #f0fae8);
}

.flashcard-filter-tab.active {
    background: var(--accent-green, #16a34a);
    color: #fff;
    border-color: var(--accent-green, #16a34a);
    box-shadow: 0 4px 14px rgba(22, 163, 74, 0.3);
}

.fc-tab-count {
    font-size: 0.72rem;
    font-weight: 700;
    background: var(--bg-card-hover, rgba(0, 0, 0, 0.08));
    border-radius: 999px;
    padding: 1px 7px;
    min-width: 24px;
    text-align: center;
    color: var(--text-muted);
}

.flashcard-filter-tab.active .fc-tab-count {
    background: rgba(255, 255, 255, 0.25);
    color: #fff;
}

/* ===== Flashcard Card ===== */

.flashcard-card {
    background: var(--bg-card, #fffdf8);
    border: 2px solid var(--border-soft, #e5e7eb);
    border-radius: 20px;
    padding: 20px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    height: 100%;
    position: relative;
    overflow: hidden;
}

.flashcard-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover, 0 16px 40px rgba(15, 23, 42, 0.12));
    border-color: var(--accent-green, #16a34a);
}

.flashcard-card.flipped {
    border-color: var(--accent-green, #16a34a);
    background: var(--accent-green-bg, #f0fdf4);
}

/* Front */
.flashcard-front {
    text-align: center;
    margin-bottom: 12px;
}

.flashcard-kanji {
    font-family: 'Zen Maru Gothic', 'Noto Sans JP', serif;
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--text-main, #172033);
    line-height: 1.2;
}

.flashcard-reading {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.9rem;
    color: var(--accent-green, #16a34a);
    font-weight: 700;
    margin-top: 4px;
}

.flashcard-word {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.82rem;
    color: var(--text-soft, #334155);
    font-weight: 600;
    margin-top: 2px;
}

/* Example sentence */
.flashcard-example {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.82rem;
    color: var(--text-muted, #475569);
    line-height: 1.7;
    background: var(--bg-card-hover, #f8fafc);
    border-radius: 12px;
    padding: 10px 12px;
    margin-bottom: 10px;
    border-left: 3px solid var(--accent-green, #6DBE45);
}

/* Meta badges */
.flashcard-meta {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    align-items: center;
}

.flashcard-freq {
    font-size: 0.72rem;
    font-weight: 800;
    background: var(--danger-bg, #fef2f2);
    color: var(--danger-text, #dc2626);
    border: 1px solid rgba(244, 63, 94, 0.2);
    border-radius: 999px;
    padding: 2px 8px;
}

.flashcard-exams {
    font-size: 0.72rem;
    font-weight: 800;
    background: var(--info-bg, #eff6ff);
    color: var(--info-text, #2563eb);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: 999px;
    padding: 2px 8px;
}

.flashcard-part {
    font-size: 0.7rem;
    font-weight: 800;
    background: var(--success-bg, #f0fdf4);
    color: var(--success-text, #16a34a);
    border: 1px solid rgba(34, 197, 94, 0.2);
    border-radius: 999px;
    padding: 2px 8px;
    margin-left: auto;
}

/* Flip hint */
.flashcard-flip-hint {
    text-align: center;
    font-size: 0.72rem;
    color: var(--text-muted, #94a3b8);
    margin-top: 8px;
    font-weight: 600;
}

/* Back side */
.flashcard-back {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 2px dashed rgba(101, 199, 71, 0.3);
}

.flashcard-back-title {
    font-size: 0.78rem;
    font-weight: 800;
    color: var(--accent-green, #16a34a);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.flashcard-back-answer {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--accent-green, #166534);
    margin-bottom: 6px;
}

.flashcard-back-question {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.85rem;
    color: var(--text-main, #334155);
    line-height: 1.7;
    background: var(--bg-card, #fff);
    border-radius: 10px;
    padding: 10px 12px;
    border: 1px solid var(--border-soft, #e5e7eb);
    margin-bottom: 8px;
}

.flashcard-back-choices {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 8px;
}

.fc-choice {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.78rem;
    font-weight: 700;
    background: var(--bg-card-hover, #f8fafc);
    border: 1px solid var(--border-soft, #e5e7eb);
    border-radius: 8px;
    padding: 4px 10px;
    color: var(--text-muted, #475569);
}

.fc-choice-correct {
    background: var(--success-bg, #dcfce7);
    border-color: var(--accent-green, #16a34a);
    color: var(--success-text, #166534);
}

.flashcard-back-source {
    font-size: 0.72rem;
    color: var(--text-muted, #94a3b8);
    font-weight: 600;
}

/* ===== View Toggle ===== */

.flashcard-view-toggle {
    display: flex;
    gap: 4px;
    background: var(--bg-card-hover, #f1f5f9);
    border-radius: 12px;
    padding: 4px;
}

.view-btn {
    background: transparent;
    border: none;
    border-radius: 10px;
    padding: 8px 12px;
    color: var(--text-muted, #94a3b8);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.view-btn:hover {
    color: var(--text-soft, #475569);
    background: var(--bg-card, #fff);
}

.view-btn.active {
    background: var(--bg-card, #fff);
    color: var(--accent-green, #16a34a);
    box-shadow: 0 2px 8px rgba(22, 163, 74, 0.15);
}

/* ===== List View ===== */

.fc-list-row {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 4px 0;
}

.fc-list-kanji {
    font-family: 'Zen Maru Gothic', 'Noto Sans JP', serif;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-main, #172033);
    min-width: 56px;
    text-align: center;
    flex-shrink: 0;
}

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

.fc-list-reading {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.85rem;
    color: var(--accent-green, #16a34a);
    font-weight: 700;
    margin-right: 8px;
}

.fc-list-word {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.82rem;
    color: var(--text-soft, #334155);
    font-weight: 600;
}

.fc-list-example {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 0.8rem;
    color: var(--text-muted, #64748b);
    line-height: 1.6;
    margin-top: 4px;
}

.fc-list-meta {
    display: flex;
    gap: 6px;
    align-items: center;
    flex-shrink: 0;
}

/* ===== Responsive ===== */

@media (max-width: 768px) {
    .kanji-hero {
        padding: 24px 0 16px;
    }

    .kanji-char {
        font-size: 2.2rem;
    }

    .kanji-card {
        padding: 16px 10px;
        border-radius: 16px;
    }

    .kanji-tab {
        padding: 8px 14px;
        font-size: 0.9rem;
    }
}
@media (max-width: 576px) {
    .kanji-char {
        font-size: 1.8rem;
    }

    .kanji-reading {
        font-size: 0.8rem;
    }

    .kanji-word {
        font-size: 0.75rem;
    }

    .kanji-meaning {
        font-size: 0.72rem;
    }
}

/* ================================================================
   KANJI DECK — Deck Selection Cards (green theme)
   ================================================================ */

/* Loading spinner */
.deck-loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-soft, #e5e7eb);
    border-top-color: var(--green, #6DBE45);
    border-radius: 50%;
    animation: deckSpin 0.8s linear infinite;
    margin: 0 auto;
}

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

.deck-loading-text {
    color: var(--text-muted, #64748b);
    font-weight: 700;
    font-size: 0.95rem;
}

/* Empty state icon */
.empty-icon {
    font-size: 3.5rem;
    margin-bottom: 12px;
    opacity: 0.6;
}

/* ===== Deck Card ===== */
.deck-card {
    background: var(--bg-card, #ffffff);
    border-radius: 24px;
    padding: 22px 20px 18px;
    box-shadow: var(--shadow-card, 0 14px 40px rgba(36, 48, 68, 0.08));
    border: 1px solid var(--border-soft, rgba(255, 255, 255, 0.8));
    transition: all 0.45s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: pointer;
    height: 100%;
}

.deck-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 24px 60px rgba(36, 48, 68, 0.12);
    border-color: var(--green, #6DBE45);
}

/* ===== Header ===== */
.deck-card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}

.deck-level-icon {
    font-size: 1.8rem;
    line-height: 1;
}

.deck-level-name {
    font-size: 1.3rem;
    font-weight: 900;
    color: var(--text-main, #0f172a);
    flex: 1;
}

.deck-count-pill {
    background: var(--mint, #edf9e5);
    color: var(--green-dark, #5aa83a);
    padding: 4px 12px;
    border-radius: 999px;
    font-weight: 800;
    font-size: 0.78rem;
    white-space: nowrap;
    flex-shrink: 0;
    border: 1px solid rgba(109, 190, 69, 0.12);
}

/* ===== Kanji Preview Strip ===== */
.deck-kanji-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 16px;
    min-height: 28px;
}

.deck-char-chip {
    font-family: 'Zen Maru Gothic', 'Noto Sans JP', serif;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-soft, #334155);
    background: var(--bg-soft, #f1f5f9);
    padding: 2px 6px;
    border-radius: 7px;
    line-height: 1.3;
    transition: all 0.2s ease;
}

.deck-card:hover .deck-char-chip {
    background: var(--mint, #edf9e5);
    color: var(--green-dark, #5aa83a);
}

.deck-char-more {
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--text-muted, #94a3b8);
    display: flex;
    align-items: center;
    padding: 2px 4px;
}

/* ===== Deck Description ===== */
.deck-desc {
    font-size: 0.82rem;
    color: var(--text-muted, #64748b);
    line-height: 1.5;
    margin-bottom: 14px;
    font-weight: 500;
}

/* ===== Study Button ===== */
.deck-study-btn {
    width: 100%;
    padding: 12px 20px;
    border-radius: 14px;
    border: none;
    background: var(--green, #6DBE45);
    color: #ffffff;
    font-weight: 900;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: 'Nunito', sans-serif;
}

.deck-study-btn:hover {
    background: var(--green-dark, #5aa83a);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(109, 190, 69, 0.35);
}

.deck-study-btn:active {
    transform: translateY(0) scale(0.98);
}

.deck-study-arrow {
    transition: transform 0.3s ease;
    font-size: 1.2rem;
}

.deck-study-btn:hover .deck-study-arrow {
    transform: translateX(4px);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .deck-card {
        padding: 18px 16px 16px;
        border-radius: 20px;
    }

    .deck-level-icon {
        font-size: 1.5rem;
    }

    .deck-level-name {
        font-size: 1.15rem;
    }

    .deck-char-chip {
        font-size: 0.9rem;
        padding: 1px 5px;
    }

    .deck-study-btn {
        padding: 11px 16px;
        font-size: 0.9rem;
    }
}

/* ============================================================
   SHARED FLASHCARD PLAYER STYLES (SCOPED)
   ============================================================ */

.flashcard-shell {
    background: var(--bg-card, rgba(255, 255, 255, 0.86));
    border-radius: 34px;
    padding: 28px;
    box-shadow: var(--shadow-lg, 0 28px 80px rgba(36, 48, 68, 0.1));
    border: 1px solid var(--border-soft, rgba(255, 255, 255, 0.8));
    margin-top: 20px;
}

.flashcard-shell .flashcard-stage {
    perspective: 1200px;
    min-height: 380px;
}

.flashcard-shell .flashcard {
    position: relative;
    width: 100%;
    min-height: 380px;
    transform-style: preserve-3d;
    transition: transform 0.55s ease;
    cursor: pointer;
}

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

.flashcard-shell .flashcard-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    border-radius: 34px;
    padding: 48px;
    background:
        radial-gradient(circle at top left, var(--accent-rose-bg, #ffe4ec), transparent 35%),
        radial-gradient(circle at bottom right, var(--accent-blue-bg, #e8f5ff), transparent 35%),
        var(--bg-card, #ffffff);
    box-shadow: var(--shadow-card, 0 25px 70px rgba(36, 48, 68, 0.12));
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    border: 1px solid var(--border-soft, transparent);
}

[data-theme="dark"] .flashcard-shell .flashcard-face {
    background:
        radial-gradient(circle at top left, rgba(255, 92, 138, 0.1), transparent 35%),
        radial-gradient(circle at bottom right, rgba(99, 179, 255, 0.08), transparent 35%),
        var(--bg-card-2) !important;
    border-color: var(--border-soft);
}

.flashcard-shell .flashcard-face::after {
    content: "日本語";
    position: absolute;
    right: -15px;
    bottom: -25px;
    font-family: 'Noto Sans JP', sans-serif;
    font-size: 5rem;
    font-weight: 900;
    color: rgba(88, 200, 61, 0.04);
    pointer-events: none;
}

.flashcard-shell .flashcard-back {
    transform: rotateY(180deg) !important;
    margin-top: 0 !important;
    padding-top: 48px !important;
    border-top: none !important;
    background:
        radial-gradient(circle at top left, var(--accent-blue-bg, #e8f5ff), transparent 35%),
        radial-gradient(circle at bottom right, var(--accent-rose-bg, #ffe4ec), transparent 35%),
        var(--bg-card, #ffffff) !important;
}

[data-theme="dark"] .flashcard-shell .flashcard-back {
    background:
        radial-gradient(circle at top left, rgba(99, 179, 255, 0.08), transparent 35%),
        radial-gradient(circle at bottom right, rgba(255, 92, 138, 0.1), transparent 35%),
        var(--bg-card-2) !important;
}

.flashcard-shell .flashcard-word {
    font-family: 'Noto Sans JP', sans-serif;
    font-size: clamp(56px, 7vw, 88px);
    font-weight: 900;
    text-align: center;
    line-height: 1.05;
    word-wrap: break-word;
    word-break: keep-all;
    overflow-wrap: break-word;
}

.flashcard-shell .flashcard-meaning {
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 900;
    text-align: center;
    word-wrap: break-word;
    word-break: keep-all;
    overflow-wrap: break-word;
}

.flashcard-shell .flashcard-progress-row {
    display: flex;
    align-items: center;
}

.flashcard-shell .flashcard-progress {
    height: 8px;
    border-radius: 999px;
    background: var(--bg-soft, #edf2f7);
    overflow: hidden;
}

.flashcard-shell .flashcard-progress-bar {
    height: 100%;
    border-radius: 999px;
    background: var(--accent-green, #16a34a);
    transition: width 0.3s ease;
}

.flashcard-shell .flashcard-counter {
    background: var(--bg-card, #ffffff);
    border-radius: 999px;
    padding: 10px 18px;
    font-weight: 900;
    box-shadow: var(--shadow-sm, 0 14px 30px rgba(36, 48, 68, 0.08));
    color: var(--text-main);
    border: 1px solid var(--border-soft, transparent);
}

.flashcard-shell .hint-pill {
    align-self: center;
    background: var(--accent-green-soft, rgba(88, 204, 2, 0.12));
    color: var(--accent-green, #58cc02);
    font-weight: 800;
    font-size: 0.8rem;
    padding: 6px 16px;
    border-radius: 999px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Actions footer */
.flashcard-actions {
    display: flex;
    gap: 14px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 20px;
}

.flashcard-action-btn {
    border-radius: 999px;
    padding: 14px 26px;
    font-weight: 900;
    transition: all 0.2s ease;
    white-space: nowrap;
    border: none;
}

.flashcard-action-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md, 0 8px 20px rgba(36, 48, 68, 0.15));
}

.btn-again {
    background-color: var(--danger-bg, #fee2e2) !important;
    color: var(--danger-text, #ef4444) !important;
    border: 1px solid rgba(239, 68, 68, 0.2) !important;
}
.btn-again:hover {
    background-color: #ef4444 !important;
    color: #ffffff !important;
}

.btn-hard {
    background-color: var(--warning-bg, #fef3c7) !important;
    color: var(--warning-text, #d97706) !important;
    border: 1px solid rgba(217, 119, 6, 0.2) !important;
}
.btn-hard:hover {
    background-color: #d97706 !important;
    color: #ffffff !important;
}

.btn-good {
    background-color: var(--info-bg, #dbeafe) !important;
    color: var(--info-text, #2563eb) !important;
    border: 1px solid rgba(37, 99, 235, 0.2) !important;
}
.btn-good:hover {
    background-color: #2563eb !important;
    color: #ffffff !important;
}

.btn-easy {
    background-color: var(--success-bg, #dcfce7) !important;
    color: var(--success-text, #16a34a) !important;
    border: 1px solid rgba(22, 163, 74, 0.2) !important;
}
.btn-easy:hover {
    background-color: #16a34a !important;
    color: #ffffff !important;
}

/* Legend */
.flashcard-legend {
    background: var(--bg-card, rgba(255, 255, 255, 0.95));
    border-radius: 18px;
    padding: 12px 20px;
    box-shadow: var(--shadow-sm, 0 8px 25px rgba(36, 48, 68, 0.05));
    border: 1px solid var(--border-soft, rgba(255, 255, 255, 0.8));
    margin-top: 20px;
    transition: all 0.3s ease;
}

.flashcard-legend:hover {
    box-shadow: var(--shadow-md, 0 12px 35px rgba(36, 48, 68, 0.07));
    transform: translateY(-1px);
}

.legend-title {
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--text-muted, #718096);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.legend-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    justify-content: center;
    align-items: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78rem;
    font-weight: 800;
    color: var(--text-soft, #2d3748);
}

.kbd-key {
    background-color: var(--bg-card, #ffffff);
    border: 1px solid var(--border-medium, #cbd5e0);
    border-radius: 6px;
    box-shadow: 0 1.5px 0 var(--border-medium, #cbd5e0), 0 2px 0 rgba(0, 0, 0, 0.06);
    color: var(--text-main, #2d3748);
    display: inline-block;
    font-family: inherit;
    font-size: 0.7rem;
    font-weight: 900;
    line-height: 1;
    padding: 4px 8px;
    white-space: nowrap;
    min-width: 22px;
    text-align: center;
}

.flashcard-toast {
    position: fixed;
    right: 24px;
    bottom: 24px;
    background: var(--bg-card, #ffffff);
    border-radius: 22px;
    padding: 16px 20px;
    box-shadow: var(--shadow-lg, 0 18px 50px rgba(36, 48, 68, 0.16));
    font-weight: 900;
    z-index: 9999;
    display: none;
    border: 1px solid var(--border-soft);
    color: var(--text-main);
}

.flashcard-toast.show {
    display: block;
}

.legend-divider {
    width: 1px;
    height: 14px;
    background-color: var(--border-soft, #e2e8f0);
}

@media (max-width: 768px) {
    .legend-grid {
        gap: 12px;
        flex-direction: column;
        align-items: flex-start;
        width: fit-content;
        margin: 0 auto;
    }
    .legend-divider {
        display: none;
    }
}

/* ================================================================
/* ==========================================================================
   REFRACTORED FLASHCARD PLAYER STYLES (WCAG AA Contrast Compliant)
   ========================================================================= */

/* Progress Row styling */
.fc-progress-row-new {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 24px;
    width: 100%;
}

.fc-back-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border-soft);
    background: var(--bg-card);
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--shadow-sm);
    line-height: 1;
}

.fc-back-btn:hover {
    background: var(--bg-card-hover);
    color: var(--primary);
    transform: scale(1.08);
    border-color: var(--border-strong);
    box-shadow: var(--shadow-md);
}

.fc-counter-new {
    font-size: 0.95rem;
    font-weight: 800;
    color: var(--text-soft);
    white-space: nowrap;
}

.fc-progress-new {
    flex: 1;
    height: 10px;
    background: var(--bg-soft);
    border-radius: 999px;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-soft);
}

.fc-progress-bar-new {
    height: 100%;
    border-radius: 999px;
    background: var(--accent-green, #10b981);
    transition: width 0.3s ease;
}

.fc-mastered-new {
    font-size: 0.95rem;
    font-weight: 800;
    color: var(--accent-green, #10b981);
    white-space: nowrap;
}

/* Card face setup and typography */
.flashcard-stage {
    perspective: 1200px;
    min-height: 380px;
    width: 100%;
}

.fc-card {
    position: relative;
    width: 100%;
    min-height: 380px;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: pointer;
}

.fc-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    border-radius: 28px;
    padding: 40px;
    background: var(--fc-face-bg);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border-soft);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    color: var(--text-main);
    transition: background 0.35s ease, border-color 0.35s ease;
}

.fc-front {
    z-index: 2;
    transform: rotateY(0deg);
}

.fc-back {
    transform: rotateY(180deg) !important;
}

.fc-card.is-flipped {
    transform: rotateY(180deg);
}

.fc-word-reading {
    font-size: clamp(1.2rem, 2vw, 1.8rem);
    font-weight: 600;
    color: var(--text-soft);
    margin-bottom: 12px;
    font-family: 'Noto Sans JP', sans-serif;
    text-align: center;
}

.fc-word-main {
    font-size: clamp(40px, 8vw, 72px);
    font-weight: 800;
    color: var(--text-main);
    font-family: 'Zen Maru Gothic', 'Noto Sans JP', sans-serif;
    line-height: 1.2;
    text-align: center;
}

.flashcard-flip-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
    margin-top: auto;
    font-weight: 600;
}

/* SRS Action Buttons styling */
.fc-actions-new {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    width: 100%;
    margin: 20px auto 0 auto;
    max-width: 820px;
}

.btn-srs {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 10px 16px;
    border-radius: 12px;
    font-weight: 800;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--shadow-sm);
    text-align: center;
    border: 2px solid transparent;
    text-decoration: none;
}

.btn-srs:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.btn-srs:active {
    transform: translateY(-1px) scale(0.98);
}

.btn-srs-title {
    font-size: 0.95rem;
    font-weight: 800;
    margin-bottom: 2px;
}

.btn-srs-time {
    font-size: 0.78rem;
    font-weight: 600;
    opacity: 0.85;
}

/* Light Theme overrides for SRS buttons (WCAG AA contrast compliant) */
[data-theme="light"] .btn-srs-again {
    background-color: #fee2e2;
    border-color: #fca5a5;
    color: #991b1b;
}
[data-theme="light"] .btn-srs-again:hover {
    background-color: #dc2626;
    border-color: #dc2626;
    color: #ffffff;
}

[data-theme="light"] .btn-srs-hard {
    background-color: #fef3c7;
    border-color: #fde68a;
    color: #92400e;
}
[data-theme="light"] .btn-srs-hard:hover {
    background-color: #d97706;
    border-color: #d97706;
    color: #ffffff;
}

[data-theme="light"] .btn-srs-good {
    background-color: #dbeafe;
    border-color: #bfdbfe;
    color: #1e40af;
}
[data-theme="light"] .btn-srs-good:hover {
    background-color: #2563eb;
    border-color: #2563eb;
    color: #ffffff;
}

[data-theme="light"] .btn-srs-easy {
    background-color: #dcfce7;
    border-color: #bbf7d0;
    color: #065f46;
}
[data-theme="light"] .btn-srs-easy:hover {
    background-color: #16a34a;
    border-color: #16a34a;
    color: #ffffff;
}

/* Dark Theme overrides for SRS buttons (WCAG AA contrast compliant) */
[data-theme="dark"] .btn-srs-again {
    background-color: rgba(239, 68, 68, 0.15);
    border-color: rgba(239, 68, 68, 0.4);
    color: #fca5a5;
}
[data-theme="dark"] .btn-srs-again:hover {
    background-color: #dc2626;
    border-color: #dc2626;
    color: #ffffff;
}

[data-theme="dark"] .btn-srs-hard {
    background-color: rgba(245, 158, 11, 0.15);
    border-color: rgba(245, 158, 11, 0.4);
    color: #fde68a;
}
[data-theme="dark"] .btn-srs-hard:hover {
    background-color: #d97706;
    border-color: #d97706;
    color: #ffffff;
}

[data-theme="dark"] .btn-srs-good {
    background-color: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.4);
    color: #93c5fd;
}
[data-theme="dark"] .btn-srs-good:hover {
    background-color: #2563eb;
    border-color: #2563eb;
    color: #ffffff;
}

[data-theme="dark"] .btn-srs-easy {
    background-color: rgba(16, 185, 129, 0.15);
    border-color: rgba(16, 185, 129, 0.4);
    color: #a7f3d0;
}
[data-theme="dark"] .btn-srs-easy:hover {
    background-color: #16a34a;
    border-color: #16a34a;
    color: #ffffff;
}

/* Toast styling override */
.fc-toast {
    position: fixed;
    right: 24px;
    bottom: 24px;
    background: var(--bg-card, #ffffff);
    border-radius: 22px;
    padding: 16px 24px;
    box-shadow: var(--shadow-lg, 0 18px 50px rgba(36, 48, 68, 0.16));
    font-weight: 800;
    z-index: 9999;
    display: none;
    border: 1px solid var(--border-soft);
    color: var(--text-main);
    font-size: 0.95rem;
    transition: opacity 0.3s ease;
}

.fc-toast.show {
    display: block;
    animation: slideInUp 0.3s ease;
}

.fc-toast-xp {
    color: var(--accent-green, #10b981);
    font-weight: 900;
    margin-left: 6px;
}

@keyframes slideInUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}


/* Button pulse animations */
.fc-rating-pulse {
    animation: ratingPulse 0.35s ease-in-out;
}

/* Responsive Overrides */
@media (max-width: 576px) {
    .fc-actions-new {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }
    .btn-srs {
        padding: 10px 12px;
        border-radius: 12px;
    }
    .btn-srs-title {
        font-size: 0.95rem;
    }
    .btn-srs-time {
        font-size: 0.8rem;
    }
    .flashcard-stage, .fc-card {
        min-height: 280px !important;
    }
    .fc-face {
        padding: 20px;
        border-radius: 20px;
    }
    .fc-progress-row-new {
        flex-wrap: wrap;
        gap: 12px;
    }
    .fc-progress-new {
        order: 4;
        flex: 0 0 100%;
        margin-top: 4px;
    }
}