/* ══════════════════════════════════════════
   WebXam Flashcards — Plugin Styles v2
   MCCTC Software Development
   ══════════════════════════════════════════ */

.wxf-app {
    --wxf-navy: #1B2A4A;
    --wxf-blue: #2E75B6;
    --wxf-light-blue: #D5E8F0;
    --wxf-sky: #EBF5FB;
    --wxf-gold: #D4A843;
    --wxf-green: #27ae60;
    --wxf-red: #e74c3c;
    --wxf-dark: #222;
    --wxf-med: #555;
    --wxf-light: #888;
    --wxf-radius: 16px;
    --wxf-shadow: 0 4px 24px rgba(27, 42, 74, 0.12);
    --wxf-shadow-lg: 0 8px 40px rgba(27, 42, 74, 0.18);
    --wxf-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    max-width: 900px;
    margin: 0 auto;
    padding: 24px 16px;
    color: var(--wxf-dark);
    -webkit-font-smoothing: antialiased;
}
.wxf-app *, .wxf-app *::before, .wxf-app *::after { box-sizing: border-box; }

/* ─── Exam Selector ─── */
.wxf-select-header { text-align: center; margin-bottom: 32px; }
.wxf-title { font-size: 2rem; font-weight: 800; color: var(--wxf-navy); margin: 0 0 8px 0; letter-spacing: -0.5px; }
.wxf-subtitle { font-size: 0.95rem; color: var(--wxf-light); margin: 0; font-weight: 500; }

.wxf-exam-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
@media (max-width: 560px) { .wxf-exam-grid { grid-template-columns: 1fr; } }

.wxf-exam-card {
    display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 6px;
    padding: 28px 16px; background: #fff; border: 2px solid var(--wxf-light-blue);
    border-radius: var(--wxf-radius); cursor: pointer; transition: var(--wxf-transition);
    box-shadow: var(--wxf-shadow); text-align: center;
}
.wxf-exam-card:hover, .wxf-exam-card:focus { border-color: var(--wxf-blue); box-shadow: var(--wxf-shadow-lg); transform: translateY(-4px); }
.wxf-exam-card:active { transform: translateY(-1px); }
.wxf-exam-icon { font-size: 2.4rem; line-height: 1; }
.wxf-exam-code { font-size: 1.4rem; font-weight: 800; color: var(--wxf-navy); letter-spacing: -0.3px; }
.wxf-exam-name { font-size: 0.85rem; color: var(--wxf-med); font-weight: 600; line-height: 1.3; }
.wxf-exam-count { font-size: 0.78rem; color: var(--wxf-light); font-weight: 500; margin-top: 2px; }

/* ─── Study Screen Top ─── */
.wxf-study-top { margin-bottom: 20px; }

.wxf-btn-back {
    display: inline-flex; align-items: center; gap: 4px; padding: 8px 16px;
    font-size: 0.85rem; font-weight: 600; color: var(--wxf-blue); background: transparent;
    border: 2px solid var(--wxf-blue); border-radius: 8px; cursor: pointer;
    transition: var(--wxf-transition); margin-bottom: 12px; font-family: inherit;
}
.wxf-btn-back:hover { background: var(--wxf-blue); color: #fff; }

.wxf-exam-title-bar { font-size: 1.3rem; font-weight: 800; color: var(--wxf-navy); margin: 0 0 12px 0; }

.wxf-controls-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }

.wxf-strand-select, .wxf-difficulty-select {
    flex: 1; min-width: 140px; padding: 10px 12px; font-size: 0.85rem; font-weight: 500;
    border: 2px solid #ddd; border-radius: 8px; background: #fff; color: var(--wxf-dark);
    cursor: pointer; transition: var(--wxf-transition); font-family: inherit;
}
.wxf-strand-select:focus, .wxf-difficulty-select:focus { border-color: var(--wxf-blue); outline: none; }

.wxf-btn-shuffle, .wxf-btn-review-filter {
    padding: 10px 16px; font-size: 0.85rem; font-weight: 600; color: var(--wxf-navy);
    background: var(--wxf-sky); border: 2px solid var(--wxf-light-blue); border-radius: 8px;
    cursor: pointer; transition: var(--wxf-transition); white-space: nowrap; font-family: inherit;
}
.wxf-btn-shuffle:hover, .wxf-btn-review-filter:hover { background: var(--wxf-light-blue); border-color: var(--wxf-blue); }
.wxf-btn-review-filter.wxf-active { background: #fecaca; border-color: var(--wxf-red); color: #991b1b; }

/* ─── Card Area ─── */
.wxf-card-area { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }

.wxf-nav-btn {
    flex-shrink: 0; width: 48px; height: 48px; border: 2px solid #ddd; border-radius: 50%;
    background: #fff; font-size: 1.6rem; line-height: 1; color: var(--wxf-navy); cursor: pointer;
    transition: var(--wxf-transition); display: flex; align-items: center; justify-content: center;
    font-family: inherit;
}
.wxf-nav-btn:hover { background: var(--wxf-navy); color: #fff; border-color: var(--wxf-navy); }
.wxf-nav-btn:disabled { opacity: 0.3; cursor: default; }
.wxf-nav-btn:disabled:hover { background: #fff; color: var(--wxf-navy); border-color: #ddd; }

/* ─── FIXED 3D Card Flip ─── */
.wxf-card-container {
    flex: 1;
    perspective: 1200px;
    cursor: pointer;
}

.wxf-card {
    width: 100%;
    height: 300px;
    position: relative;
}

.wxf-card-inner {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.wxf-card.wxf-flipped .wxf-card-inner {
    transform: rotateY(180deg);
}

.wxf-card-front, .wxf-card-back {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: var(--wxf-radius);
    padding: 28px 24px 20px;
    display: flex;
    flex-direction: column;
    box-shadow: var(--wxf-shadow-lg);
    overflow-y: auto;
}

.wxf-card-front {
    background: linear-gradient(145deg, #fff 0%, var(--wxf-sky) 100%);
    border: 2px solid var(--wxf-light-blue);
    z-index: 2;
}

.wxf-card-back {
    background: linear-gradient(145deg, #f0fdf4 0%, #dcfce7 100%);
    border: 2px solid #86efac;
    transform: rotateY(180deg);
    z-index: 1;
}

/* Status indicator dot on front of card */
.wxf-card-status {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    display: none;
}
.wxf-card-status.wxf-status-known { display: block; background: var(--wxf-green); box-shadow: 0 0 6px rgba(39,174,96,0.5); }
.wxf-card-status.wxf-status-review { display: block; background: var(--wxf-red); box-shadow: 0 0 6px rgba(231,76,60,0.5); }

.wxf-card-badge {
    display: inline-block; align-self: flex-start; padding: 4px 12px; border-radius: 20px;
    font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px;
}
.wxf-card-badge.wxf-easy { background: #dcfce7; color: #166534; }
.wxf-card-badge.wxf-medium { background: #fef9c3; color: #854d0e; }
.wxf-card-badge.wxf-hard { background: #fecaca; color: #991b1b; }

.wxf-card-strand { font-size: 0.78rem; font-weight: 600; color: var(--wxf-blue); margin-bottom: 14px; }

.wxf-card-question {
    flex: 1; font-size: 1.05rem; font-weight: 500; color: var(--wxf-navy); line-height: 1.6;
}

.wxf-card-hint { font-size: 0.75rem; color: var(--wxf-light); text-align: center; margin-top: 12px; font-weight: 500; }

.wxf-card-answer-label {
    font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px;
    color: #16a34a; margin-bottom: 12px;
}

.wxf-card-answer { flex: 1; font-size: 1.05rem; font-weight: 500; color: #14532d; line-height: 1.6; }

/* ─── Progress ─── */
.wxf-progress-bar-container { width: 100%; height: 6px; background: #e5e7eb; border-radius: 3px; overflow: hidden; margin-bottom: 8px; }
.wxf-progress-bar { height: 100%; background: linear-gradient(90deg, var(--wxf-blue), var(--wxf-gold)); border-radius: 3px; transition: width var(--wxf-transition); width: 0%; }

.wxf-progress-text { display: flex; justify-content: space-between; align-items: center; font-size: 0.85rem; color: var(--wxf-med); font-weight: 600; margin-bottom: 4px; }
.wxf-stats-row { display: flex; justify-content: center; gap: 20px; font-size: 0.82rem; font-weight: 600; margin-bottom: 14px; }
.wxf-stat-known { color: var(--wxf-green); }
.wxf-stat-review { color: var(--wxf-red); }

/* ─── Mark Buttons ─── */
.wxf-mark-row { display: flex; gap: 12px; justify-content: center; }

.wxf-btn-mark {
    padding: 10px 24px; font-size: 0.88rem; font-weight: 700; border-radius: 10px;
    border: 2px solid transparent; cursor: pointer; transition: var(--wxf-transition); font-family: inherit;
}
.wxf-btn-known { background: #dcfce7; color: #166534; border-color: #86efac; }
.wxf-btn-known:hover, .wxf-btn-known.wxf-active { background: #166534; color: #fff; }
.wxf-btn-review { background: #fecaca; color: #991b1b; border-color: #fca5a5; }
.wxf-btn-review:hover, .wxf-btn-review.wxf-active { background: #991b1b; color: #fff; }

/* ─── Empty State ─── */
.wxf-empty-state {
    text-align: center; padding: 60px 20px; color: var(--wxf-light);
}
.wxf-empty-state p { font-size: 1rem; margin: 8px 0; }

/* ─── Mobile ─── */
@media (max-width: 600px) {
    .wxf-app { padding: 16px 8px; }
    .wxf-title { font-size: 1.5rem; }
    .wxf-card { height: 260px; }
    .wxf-card-question, .wxf-card-answer { font-size: 0.95rem; }
    .wxf-nav-btn { width: 40px; height: 40px; font-size: 1.3rem; }
    .wxf-controls-row { flex-direction: column; }
    .wxf-strand-select, .wxf-difficulty-select { min-width: 100%; }
}