/* CISSP CAT Practice Exams */
:root {
    --bg: #0f1117;
    --surface: #1a1d27;
    --surface-2: #232734;
    --border: #2d3244;
    --text: #e4e6f0;
    --text-dim: #8890a8;
    --primary: #6c8cff;
    --primary-hover: #8ba4ff;
    --success: #4caf7c;
    --danger: #e05555;
    --warning: #e8a838;
    --easy: #4caf7c;
    --medium: #e8a838;
    --hard: #e05555;
    --radius: 10px;
    --shadow: 0 2px 12px rgba(0,0,0,0.3);
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
}

.screen { display: none; padding: 20px; max-width: 960px; margin: 0 auto; }
.screen.active { display: block; }

/* ===== HOME SCREEN ===== */
.header { text-align: center; padding: 40px 0 30px; }
.header h1 { font-size: 2rem; font-weight: 700; letter-spacing: -0.5px; }
.subtitle { color: var(--text-dim); margin-top: 6px; font-size: 0.95rem; }
.stats-bar {
    margin-top: 16px;
    padding: 10px 20px;
    background: var(--surface);
    border-radius: 20px;
    display: inline-block;
    font-size: 0.85rem;
    color: var(--text-dim);
}
.stats-bar span { color: var(--primary); font-weight: 600; }

/* Papers Grid */
.papers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
    margin-bottom: 40px;
}

.paper-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
}
.paper-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}
.paper-card.completed { border-left: 3px solid var(--success); }
.paper-card .paper-number {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-dim);
    margin-bottom: 6px;
}
.paper-card .paper-title { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.paper-card .paper-meta {
    font-size: 0.8rem;
    color: var(--text-dim);
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}
.paper-card .paper-meta span { white-space: nowrap; }
.paper-card .best-score {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--success);
    color: #fff;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Domain Filter */
.domain-filter { margin-bottom: 40px; }
.domain-filter h3 { font-size: 1rem; margin-bottom: 12px; color: var(--text-dim); }
.domain-buttons { display: flex; flex-wrap: wrap; gap: 8px; }
.domain-btn {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 8px 14px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.82rem;
    transition: all 0.2s;
}
.domain-btn:hover { border-color: var(--primary); color: var(--primary); }
.domain-btn .domain-count { color: var(--text-dim); font-size: 0.75rem; margin-left: 4px; }

/* History */
.history-section { margin-bottom: 40px; }
.history-section h3 { font-size: 1rem; margin-bottom: 12px; color: var(--text-dim); }
.history-list { display: flex; flex-direction: column; gap: 8px; }
.history-item {
    background: var(--surface);
    border-radius: 8px;
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}
.history-item .hi-title { font-weight: 500; }
.history-item .hi-score { font-weight: 600; }
.history-item .hi-score.pass { color: var(--success); }
.history-item .hi-score.fail { color: var(--danger); }
.history-item .hi-date { color: var(--text-dim); font-size: 0.78rem; }
.empty-state { color: var(--text-dim); font-size: 0.85rem; text-align: center; padding: 20px; }

/* ===== EXAM SCREEN ===== */
.exam-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
    background: var(--surface);
    border-radius: var(--radius);
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 10px;
}
.exam-info { display: flex; align-items: center; gap: 14px; }
#exam-title { font-weight: 600; font-size: 1rem; }
#exam-progress { color: var(--text-dim); font-size: 0.85rem; }
.difficulty-badge {
    padding: 2px 10px;
    border-radius: 10px;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.difficulty-badge.easy { background: rgba(76,175,124,0.15); color: var(--easy); }
.difficulty-badge.medium { background: rgba(232,168,56,0.15); color: var(--medium); }
.difficulty-badge.hard { background: rgba(224,85,85,0.15); color: var(--hard); }

.exam-controls { display: flex; align-items: center; gap: 10px; }
#exam-timer {
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 1.05rem;
    color: var(--text-dim);
    min-width: 80px;
}

.domain-indicator {
    font-size: 0.78rem;
    color: var(--text-dim);
    padding: 6px 14px;
    background: var(--surface-2);
    border-radius: 6px;
    margin-bottom: 16px;
    display: inline-block;
}

.question-container {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 28px;
    margin-bottom: 16px;
    min-height: 300px;
}
.question-number {
    font-size: 0.78rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}
.question-text {
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 24px;
}

.options-list { display: flex; flex-direction: column; gap: 10px; }
.option-btn {
    background: var(--surface-2);
    border: 1.5px solid var(--border);
    color: var(--text);
    padding: 14px 18px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.92rem;
    text-align: left;
    transition: all 0.15s;
    line-height: 1.5;
}
.option-btn:hover { border-color: var(--primary); background: rgba(108,140,255,0.06); }
.option-btn.selected { border-color: var(--primary); background: rgba(108,140,255,0.1); }
.option-btn.correct {
    border-color: var(--success);
    background: rgba(76,175,124,0.1);
}
.option-btn.wrong {
    border-color: var(--danger);
    background: rgba(224,85,85,0.1);
}
.option-btn.disabled { pointer-events: none; }
.option-btn .option-marker {
    display: inline-block;
    width: 24px;
    height: 24px;
    line-height: 24px;
    text-align: center;
    border-radius: 50%;
    background: var(--border);
    margin-right: 10px;
    font-size: 0.78rem;
    font-weight: 600;
    vertical-align: middle;
}
.option-btn.selected .option-marker { background: var(--primary); color: #fff; }
.option-btn.correct .option-marker { background: var(--success); color: #fff; }
.option-btn.wrong .option-marker { background: var(--danger); color: #fff; }

.explanation-box {
    margin-top: 20px;
    padding: 16px 20px;
    background: rgba(108,140,255,0.06);
    border-left: 3px solid var(--primary);
    border-radius: 0 8px 8px 0;
    font-size: 0.88rem;
    line-height: 1.65;
}
.explanation-box h4 { color: var(--primary); margin-bottom: 6px; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.5px; }

.exam-footer {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}
.question-dots {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-left: auto;
}
.q-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--border);
}
.q-dot.current { background: var(--primary); }
.q-dot.answered { background: var(--text-dim); }
.q-dot.correct-dot { background: var(--success); }
.q-dot.wrong-dot { background: var(--danger); }

/* ===== RESULTS SCREEN ===== */
.results-container { max-width: 700px; margin: 0 auto; padding: 30px 0; }
#results-title { text-align: center; margin-bottom: 30px; font-size: 1.4rem; }

.score-circle {
    position: relative;
    width: 160px;
    height: 160px;
    margin: 0 auto 30px;
}
.score-circle svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.score-bg { fill: none; stroke: var(--border); stroke-width: 8; }
.score-fill {
    fill: none;
    stroke: var(--primary);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 339.292;
    stroke-dashoffset: 339.292;
    transition: stroke-dashoffset 1s ease;
}
.score-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}
#score-percent { display: block; font-size: 2rem; font-weight: 700; }
#score-fraction { display: block; font-size: 0.82rem; color: var(--text-dim); }

.results-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-bottom: 30px;
}
.stat-card {
    background: var(--surface);
    border-radius: 8px;
    padding: 14px;
    text-align: center;
}
.stat-value { font-size: 1.15rem; font-weight: 600; }
.stat-label { font-size: 0.72rem; color: var(--text-dim); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.5px; }

.domain-breakdown { margin-bottom: 30px; }
.domain-breakdown h3 { font-size: 1rem; margin-bottom: 14px; }
.domain-bar-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    font-size: 0.82rem;
}
.domain-bar-label { min-width: 180px; color: var(--text-dim); }
.domain-bar-track {
    flex: 1;
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
}
.domain-bar-fill {
    height: 100%;
    border-radius: 4px;
    background: var(--primary);
    transition: width 0.6s ease;
}
.domain-bar-fill.low { background: var(--danger); }
.domain-bar-fill.mid { background: var(--warning); }
.domain-bar-fill.high { background: var(--success); }
.domain-bar-value { min-width: 40px; text-align: right; font-weight: 600; }

/* Review */
.review-section { margin-bottom: 30px; }
.review-section h3 { font-size: 1rem; margin-bottom: 12px; }
.review-filters { display: flex; gap: 8px; margin-bottom: 14px; }
.review-filter.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.review-list { display: flex; flex-direction: column; gap: 10px; }
.review-item {
    background: var(--surface);
    border-radius: 8px;
    padding: 16px;
    border-left: 3px solid var(--border);
}
.review-item.correct { border-left-color: var(--success); }
.review-item.wrong { border-left-color: var(--danger); }
.review-q-num { font-size: 0.75rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 4px; }
.review-q-text { font-size: 0.88rem; margin-bottom: 8px; }
.review-answer { font-size: 0.82rem; }
.review-answer .your-answer { color: var(--danger); }
.review-answer .correct-answer { color: var(--success); }
.review-explanation {
    margin-top: 8px;
    font-size: 0.8rem;
    color: var(--text-dim);
    line-height: 1.5;
    display: none;
}
.review-item.expanded .review-explanation { display: block; }
.review-toggle {
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    font-size: 0.78rem;
    margin-top: 6px;
    padding: 0;
}

.results-actions { display: flex; gap: 12px; justify-content: center; }

/* ===== BUTTONS ===== */
.btn {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.88rem;
    font-weight: 500;
    transition: all 0.15s;
}
.btn:hover { border-color: var(--text-dim); }
.btn-sm { padding: 6px 14px; font-size: 0.8rem; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-danger { color: var(--danger); border-color: var(--danger); background: transparent; }
.btn-danger:hover { background: rgba(224,85,85,0.1); }

/* ===== OVERLAY ===== */
.overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}
.overlay-content {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 40px;
    text-align: center;
    max-width: 400px;
}
.overlay-content h2 { margin-bottom: 12px; }
.overlay-content p { color: var(--text-dim); margin-bottom: 24px; }

.hidden { display: none !important; }

/* ===== GENERATOR SCREEN ===== */
.btn-generate {
    background: transparent;
    border: 1px dashed var(--primary);
    color: var(--primary);
    cursor: pointer;
    vertical-align: middle;
    margin-left: 4px;
}
.btn-generate:hover { background: rgba(108,140,255,0.1); }

.gen-header { margin-bottom: 30px; }
.gen-header h2 { margin: 16px 0 6px; font-size: 1.5rem; }
.gen-header .subtitle { color: var(--text-dim); }

.gen-section {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 20px;
}
.gen-section h3 { font-size: 1.05rem; margin-bottom: 14px; }
.gen-section h4 { font-size: 0.9rem; margin: 16px 0 10px; color: var(--text-dim); }
.gen-instructions { font-size: 0.85rem; color: var(--text-dim); margin-bottom: 14px; }

.gen-controls { display: flex; gap: 20px; flex-wrap: wrap; margin-bottom: 16px; }
.gen-field { display: flex; flex-direction: column; gap: 4px; }
.gen-field label { font-size: 0.82rem; color: var(--text-dim); }
.gen-field input, .gen-field select {
    background: var(--surface-2);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.88rem;
}
.gen-hint { font-size: 0.72rem; color: var(--text-dim); }

.gen-domains { display: flex; flex-direction: column; gap: 8px; }
.gen-domain-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    background: var(--surface-2);
    border-radius: 6px;
    flex-wrap: wrap;
}
.gen-domain-row label {
    flex: 1;
    min-width: 200px;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}
.gen-domain-row input[type="number"] {
    width: 70px;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 4px 8px;
    border-radius: 4px;
    text-align: center;
    font-size: 0.85rem;
}
.gen-domain-row input[type="checkbox"] {
    accent-color: var(--primary);
    width: 16px;
    height: 16px;
}

.gen-total {
    margin-top: 12px;
    text-align: right;
    font-size: 0.9rem;
    color: var(--primary);
    font-weight: 600;
}

#gen-prompt-text, #gen-import-text {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 14px;
    border-radius: 8px;
    font-family: 'Consolas', 'Courier New', monospace;
    font-size: 0.8rem;
    resize: vertical;
    margin-bottom: 10px;
    line-height: 1.5;
}
#gen-prompt-text:focus, #gen-import-text:focus { border-color: var(--primary); outline: none; }

.gen-import-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }

.gen-status { margin-top: 10px; }
.gen-success {
    background: rgba(76,175,124,0.1);
    border: 1px solid var(--success);
    border-radius: 8px;
    padding: 12px 16px;
    font-size: 0.85rem;
    line-height: 1.6;
}
.gen-error {
    color: var(--danger);
    font-size: 0.85rem;
}
.gen-warning { color: var(--warning); }
.gen-error-details {
    margin-top: 8px;
    padding: 10px;
    background: rgba(224,85,85,0.05);
    border-radius: 6px;
    font-size: 0.78rem;
    color: var(--text-dim);
    line-height: 1.6;
    max-height: 150px;
    overflow-y: auto;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 640px) {
    .screen { padding: 12px; }
    .header h1 { font-size: 1.4rem; }
    .papers-grid { grid-template-columns: 1fr; }
    .results-stats { grid-template-columns: repeat(2, 1fr); }
    .exam-header { flex-direction: column; align-items: flex-start; }
    .question-container { padding: 18px; }
    .domain-bar-label { min-width: 80px; font-size: 0.72rem; }
}