/* ============================================
   VOCABULARY FLASHCARDS STYLES
   ============================================ */

.flashcards-stage {
    min-height: 100vh;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    z-index: 2;
}

.game-header {
    width: min(100%, 54rem);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
}

.back-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 700;
    padding: 0.6rem 1rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--glass-border);
    border-radius: 0.8rem;
    transition: all 0.2s ease;
}

.back-link:hover {
    background: rgba(255, 255, 255, 0.16);
    color: #fff;
    transform: translateY(-2px);
}

.page-title {
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 900;
    color: var(--text-primary);
    letter-spacing: -0.03em;
}

.accent-text {
    background: linear-gradient(135deg, #c8a24a, #e6c877, #7a4324);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.board-surface {
    width: min(100%, 54rem);
    padding: 1.8rem;
    display: flex;
    flex-direction: column;
    gap: 1.4rem;
}

/* Solo Controls */
.solo-controls {
    padding: 1.2rem;
    background: rgba(10, 20, 38, 0.5);
    border: 1px solid var(--glass-border);
    border-radius: 1.2rem;
}

.solo-top-row {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    align-items: center;
}

.theme-input {
    flex: 1;
    min-width: 200px;
    padding: 0.85rem 1.2rem;
    border-radius: 1rem;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    transition: all 0.25s ease;
}

.theme-input:focus {
    border-color: #e6c877;
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 0 0 3px rgba(230, 200, 119, 0.2);
}

.btn-primary, .btn-secondary {
    padding: 0.85rem 1.4rem;
    border-radius: 1rem;
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.25s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, #c8a24a, #e6c877);
    color: #fff;
    box-shadow: 0 4px 14px rgba(200, 162, 74, 0.35);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(200, 162, 74, 0.45);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.18);
    transform: translateY(-2px);
}

.btn-review-mode {
    border-color: #f43f5e;
    color: #fca5a5;
}

.btn-review-mode.active {
    background: rgba(244, 63, 94, 0.25);
    border-color: #fb7185;
    color: #fff;
    box-shadow: 0 0 16px rgba(244, 63, 94, 0.4);
}

/* Stats Row */
.stats-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.stat-badge {
    padding: 0.6rem 1.2rem;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--glass-border);
    border-radius: 2rem;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
}

.mastered-badge {
    border-color: rgba(34, 197, 94, 0.4);
    color: #86efac;
}

.review-badge {
    border-color: rgba(244, 63, 94, 0.4);
    color: #fca5a5;
}

.progress-container {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #e6c877, #e6c877, #7a4324);
    border-radius: 4px;
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 3D Flip Card Scene */
.card-scene {
    width: 100%;
    min-height: 320px;
    perspective: 1200px;
}

.flashcard {
    position: relative;
    width: 100%;
    height: 100%;
    min-height: 320px;
    transform-style: preserve-3d;
    transition: transform 0.65s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

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

.card-face {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    border-radius: 1.6rem;
    border: 1px solid var(--glass-border);
    padding: 2.2rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}

.card-front {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.92));
}

.card-back {
    transform: rotateY(180deg);
    background: linear-gradient(135deg, rgba(88, 28, 135, 0.75), rgba(30, 27, 75, 0.92));
    border-color: rgba(200, 162, 74, 0.4);
}

.card-header-row {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-side-label {
    font-size: 0.82rem;
    font-weight: 800;
    letter-spacing: 0.18em;
    color: var(--text-muted);
}

.btn-pronounce {
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-pronounce:hover {
    background: rgba(230, 200, 119, 0.25);
    border-color: #e6c877;
    transform: scale(1.1);
}

.card-body {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem 0;
    text-align: center;
}

.card-text {
    font-size: clamp(2.4rem, 6vw, 4.2rem);
    font-weight: 900;
    color: #fff;
    letter-spacing: -0.03em;
    line-height: 1.15;
    word-break: break-word;
}

.card-back .card-text {
    color: #fde047;
    text-shadow: 0 0 24px rgba(253, 224, 71, 0.3);
}

.flip-hint {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-muted);
}

/* Actions Bar */
.card-actions-bar {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.75rem;
}

.action-btn {
    padding: 0.9rem 0.6rem;
    border-radius: 1rem;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    transition: all 0.2s ease;
}

.action-btn:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.14);
}

.action-btn:active {
    transform: scale(0.96);
}

.btn-mark-review:hover {
    border-color: #f43f5e;
    background: rgba(244, 63, 94, 0.18);
    color: #fca5a5;
}

.btn-mark-mastered:hover {
    border-color: #22c55e;
    background: rgba(34, 197, 94, 0.18);
    color: #86efac;
}

.btn-flip-card:hover {
    border-color: #c8a24a;
    background: rgba(200, 162, 74, 0.18);
    color: #e6c877;
}

.btn-nav:hover {
    border-color: #e6c877;
    background: rgba(230, 200, 119, 0.18);
    color: #e6c877;
}

.status-banner {
    padding: 1rem 1.25rem;
    color: var(--text-secondary);
    line-height: 1.5;
    text-align: center;
    background: rgba(8, 15, 28, 0.56);
    border-radius: 1rem;
}

@media (max-width: 800px) {
    .card-actions-bar {
        grid-template-columns: repeat(3, 1fr);
    }
    .btn-mark-review { grid-column: span 1; }
    .btn-flip-card { grid-column: span 1; }
    .btn-mark-mastered { grid-column: span 1; }
    .btn-nav { grid-column: span 1.5; }
}

@media (max-width: 600px) {
    .flashcards-stage {
        padding: 0.8rem;
    }
    .board-surface {
        padding: 1rem;
    }
    .card-scene {
        min-height: 260px;
    }
    .flashcard {
        min-height: 260px;
    }
    .card-face {
        padding: 1.4rem;
    }
    .solo-top-row {
        flex-direction: column;
    }
    .btn-primary, .btn-secondary, .theme-input {
        width: 100%;
    }
    .card-actions-bar {
        grid-template-columns: repeat(2, 1fr);
    }
    .btn-flip-card { grid-column: span 2; }
}