/**
 * CyberOps Dark Industrial Terminal Theme
 * Shared CSS for all CyberOps 200-201 course pages.
 * Design: Utilitarian dark ops — military-grade UI stripped to function.
 * Ref: _app/docs/themes/ui-themes/dark-industrial-terminal.md
 */

/* ══════════════════════════════════════════════════════════════
   RESET & BASE
   ══════════════════════════════════════════════════════════════ */
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Segoe UI',system-ui,-apple-system,sans-serif;background:#080b12;min-height:100vh;color:#c8cdd5;line-height:1.7}

/* Scan-lines */
body::after{content:'';position:absolute;inset:0;pointer-events:none;background:repeating-linear-gradient(0deg,transparent,transparent 2px,rgba(0,0,0,0.03) 2px,rgba(0,0,0,0.03) 4px);z-index:9999}
@media(prefers-reduced-motion:reduce){body::after{display:none}}

/* ══════════════════════════════════════════════════════════════
   LAYOUT
   ══════════════════════════════════════════════════════════════ */
.container{max-width:1200px;margin:0 auto;padding:20px 24px}
.container-narrow{max-width:900px;margin:0 auto;padding:20px 24px}

/* ══════════════════════════════════════════════════════════════
   HEADER BAR
   ══════════════════════════════════════════════════════════════ */
.co-header{background:#0d1117;border-bottom:1px solid #1e2a3a;position:sticky;top:0;z-index:100}
.co-header::after{content:'';display:block;height:3px;background:linear-gradient(90deg,#b45309,#d97706,#b45309)}
.co-header-content{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:12px 24px}
.co-back{color:#6b7280;text-decoration:none;font-size:0.85rem;font-weight:600;transition:color 0.2s;display:flex;align-items:center;gap:6px}
.co-back:hover{color:#d97706}
.co-badge{background:rgba(180,83,9,0.15);color:#d97706;padding:4px 14px;border-radius:3px;font-weight:700;font-size:0.72rem;letter-spacing:0.08em;text-transform:uppercase;border:1px solid rgba(180,83,9,0.3)}

/* ══════════════════════════════════════════════════════════════
   BREADCRUMB
   ══════════════════════════════════════════════════════════════ */
.co-breadcrumb{background:#0d1117;border:1px solid #1e2a3a;border-radius:4px;padding:10px 18px;margin-bottom:20px;font-size:0.85rem}
.co-breadcrumb a{color:#6b7280;text-decoration:none;transition:color 0.2s}
.co-breadcrumb a:hover{color:#d97706}
.co-breadcrumb .sep{color:#374151;margin:0 8px}
.co-breadcrumb .current{color:#d97706}

/* ══════════════════════════════════════════════════════════════
   INTRO / HERO SECTION
   ══════════════════════════════════════════════════════════════ */
.co-intro{background:#0d1117;border:1px solid #1e2a3a;border-radius:4px;padding:28px 32px;margin-bottom:24px;text-align:center;position:relative;overflow:hidden}
.co-intro::before{content:'';position:absolute;top:0;left:0;right:0;height:2px;background:linear-gradient(90deg,transparent,rgba(217,119,6,0.4),transparent)}
.co-intro-icon{margin-bottom:14px}
.co-intro-icon img{width:36px;height:36px;opacity:0.7}
.co-intro h1{font-size:1.6rem;font-weight:700;color:#e5e7eb;margin-bottom:8px}
.co-intro .subtitle{color:#6b7280;max-width:680px;margin:0 auto;font-size:0.92rem}
.co-case-id{font-family:'Courier New',monospace;font-size:0.72rem;color:#4b5563;letter-spacing:0.12em;text-transform:uppercase;margin-bottom:12px}

/* ══════════════════════════════════════════════════════════════
   TAGS / BADGES
   ══════════════════════════════════════════════════════════════ */
.co-tag-row{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap;justify-content:center}
.co-tag{padding:4px 12px;border-radius:3px;font-size:0.72rem;font-weight:600;letter-spacing:0.06em;text-transform:uppercase}
.co-tag-week{background:rgba(180,83,9,0.15);color:#d97706;border:1px solid rgba(180,83,9,0.3)}
.co-tag-wrap{background:rgba(220,38,38,0.1);color:#ef4444;border:1px solid rgba(220,38,38,0.2)}
.co-tag-topic{background:rgba(99,102,241,0.1);color:#818cf8;border:1px solid rgba(99,102,241,0.2)}
.co-tag-link{background:rgba(22,163,74,0.1);color:#16a34a;border:1px solid rgba(22,163,74,0.2)}
.co-tag-create{background:rgba(180,83,9,0.1);color:#d97706;border:1px solid rgba(180,83,9,0.2)}
.co-tag-lab{background:rgba(220,38,38,0.1);color:#ef4444;border:1px solid rgba(220,38,38,0.2)}

/* ══════════════════════════════════════════════════════════════
   TABS
   ══════════════════════════════════════════════════════════════ */
.co-tabs{display:flex;gap:2px;margin-bottom:24px;background:#0d1117;border:1px solid #1e2a3a;border-radius:4px;padding:3px;overflow-x:auto}
.co-tab{padding:10px 18px;background:transparent;border:none;border-radius:3px;color:#6b7280;cursor:pointer;font-size:0.82rem;font-weight:600;transition:all 0.2s;white-space:nowrap;letter-spacing:0.02em}
.co-tab:hover{color:#c8cdd5;background:rgba(255,255,255,0.04)}
.co-tab.active{background:rgba(180,83,9,0.12);color:#d97706;box-shadow:inset 0 -2px 0 #b45309}
.co-tab-content{display:none}
.co-tab-content.active{display:block}

/* ══════════════════════════════════════════════════════════════
   PANELS
   ══════════════════════════════════════════════════════════════ */
.co-panel{background:#0d1117;border:1px solid #1e2a3a;border-radius:4px;padding:24px 28px;margin-bottom:16px}
.co-panel-title{font-size:1.15rem;font-weight:700;color:#e5e7eb;margin-bottom:6px}
.co-panel-ref{font-size:0.78rem;color:#4b5563;margin-bottom:20px;font-family:'Courier New',monospace;letter-spacing:0.04em}

/* ══════════════════════════════════════════════════════════════
   SECTION TITLES
   ══════════════════════════════════════════════════════════════ */
.co-sec-title{font-size:0.85rem;font-weight:700;color:#d97706;text-transform:uppercase;letter-spacing:0.08em;margin:24px 0 14px 0}
.co-sec-title:first-child{margin-top:0}
h2.co-heading{color:#e5e7eb;font-size:1.25rem;font-weight:700;margin-bottom:18px;padding-bottom:10px;border-bottom:1px solid #1e2a3a}
h3.co-subheading{color:#d97706;font-size:0.9rem;font-weight:700;text-transform:uppercase;letter-spacing:0.08em;margin:28px 0 14px 0}
p.co-text{color:#9ca3af;line-height:1.75;margin-bottom:14px;font-size:0.92rem}

/* ══════════════════════════════════════════════════════════════
   CARDS
   ══════════════════════════════════════════════════════════════ */
.co-card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px;margin:14px 0}
.co-card{background:#0d1117;border:1px solid #1e2a3a;border-radius:4px;padding:16px 18px;transition:border-color 0.2s}
.co-card:hover{border-color:#374151}
.co-card h4{color:#e5e7eb;font-size:0.85rem;font-weight:700;margin-bottom:6px;display:flex;align-items:center;gap:8px}
.co-card h4::before{content:'';width:6px;height:6px;border-radius:1px;background:#d97706;flex-shrink:0}
.co-card h4 img{width:18px;height:18px;opacity:0.7}
.co-card p{color:#6b7280;font-size:0.82rem;line-height:1.6;margin:0}

/* ══════════════════════════════════════════════════════════════
   TABLES
   ══════════════════════════════════════════════════════════════ */
.co-table{width:100%;border-collapse:collapse;margin:16px 0;font-size:0.88rem}
.co-table th{padding:10px 14px;text-align:left;background:#0d1117;color:#d97706;font-weight:600;font-size:0.78rem;text-transform:uppercase;letter-spacing:0.08em;border-bottom:2px solid #1e2a3a}
.co-table td{padding:10px 14px;border-bottom:1px solid rgba(30,42,58,0.6);color:#9ca3af}
.co-table tr:hover td{background:rgba(180,83,9,0.04);color:#c8cdd5}
.co-table td:first-child{color:#e5e7eb;font-weight:500}

/* ══════════════════════════════════════════════════════════════
   CODE BLOCKS
   ══════════════════════════════════════════════════════════════ */
.co-code{background:#0a0e14;border:1px solid #1e2a3a;border-radius:4px;padding:16px 18px;font-family:'Cascadia Code','Fira Code','Courier New',monospace;font-size:0.82rem;line-height:1.7;overflow-x:auto;margin:14px 0;position:relative;white-space:pre-wrap}
.co-code::before{content:'TERMINAL';position:absolute;top:0;right:0;padding:2px 10px;font-size:0.6rem;color:#374151;letter-spacing:0.1em;background:#0d1117;border-bottom-left-radius:4px;border-left:1px solid #1e2a3a;border-bottom:1px solid #1e2a3a}
.co-code .comment{color:#4b5563}
.co-code .keyword{color:#d97706}
.co-code .string{color:#16a34a}
.co-code .highlight{color:#818cf8}

/* ══════════════════════════════════════════════════════════════
   ALERTS
   ══════════════════════════════════════════════════════════════ */
.co-alert{padding:14px 18px;border-radius:4px;margin:18px 0;border:1px solid;font-size:0.88rem}
.co-alert.info{background:rgba(99,102,241,0.06);border-color:rgba(99,102,241,0.2)}
.co-alert.info .co-alert-title{color:#818cf8}
.co-alert.warning{background:rgba(180,83,9,0.06);border-color:rgba(180,83,9,0.2)}
.co-alert.warning .co-alert-title{color:#d97706}
.co-alert.soc{background:rgba(16,163,74,0.06);border-color:rgba(16,163,74,0.2)}
.co-alert.soc .co-alert-title{color:#16a34a}
.co-alert.danger{background:rgba(220,38,38,0.06);border-color:rgba(220,38,38,0.2)}
.co-alert.danger .co-alert-title{color:#dc2626}
.co-alert-title{font-weight:700;font-size:0.8rem;text-transform:uppercase;letter-spacing:0.06em;margin-bottom:6px}
.co-alert p{margin:0;color:#9ca3af;line-height:1.6}

/* ══════════════════════════════════════════════════════════════
   PROGRESS CARDS
   ══════════════════════════════════════════════════════════════ */
.co-progress-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px;margin-bottom:24px}
.co-progress-card{background:#0d1117;border:1px solid #1e2a3a;border-radius:4px;padding:16px;text-align:center}
.co-progress-card h3{color:#6b7280;font-size:0.75rem;text-transform:uppercase;letter-spacing:0.08em;margin-bottom:8px}
.co-progress-num{font-size:1.8rem;font-weight:700;color:#d97706;font-family:'Courier New',monospace}
.co-progress-bar{width:100%;height:5px;background:rgba(255,255,255,0.06);border-radius:2px;margin-top:10px;overflow:hidden}
.co-progress-fill{height:100%;background:#d97706;border-radius:2px;transition:width 0.5s ease}

/* ══════════════════════════════════════════════════════════════
   TOPIC / LEARNING PATH CARDS
   ══════════════════════════════════════════════════════════════ */
.co-topic-grid{display:grid;gap:8px}
.co-topic-card{display:grid;grid-template-columns:44px 1fr auto;gap:16px;align-items:center;background:rgba(255,255,255,0.02);border:1px solid #1e2a3a;border-radius:4px;padding:14px 18px;text-decoration:none;color:inherit;transition:all 0.2s}
.co-topic-card:hover{border-color:#374151;background:rgba(255,255,255,0.04)}
.co-topic-card.completed{border-color:rgba(22,163,74,0.3);background:rgba(22,163,74,0.04)}
.co-topic-num{width:36px;height:36px;border-radius:3px;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:0.85rem;font-family:'Courier New',monospace;background:rgba(180,83,9,0.1);color:#d97706;border:1px solid rgba(180,83,9,0.25)}
.co-topic-card.completed .co-topic-num{background:rgba(22,163,74,0.1);color:#16a34a;border-color:rgba(22,163,74,0.25)}
.co-topic-content h3{color:#e5e7eb;font-size:0.92rem;margin-bottom:3px}
.co-topic-content p{color:#6b7280;font-size:0.82rem}
.co-topic-meta{display:flex;flex-direction:column;align-items:flex-end;gap:6px}
.co-status{color:#374151;font-size:1rem;font-weight:700}
.co-topic-card.completed .co-status{color:#16a34a}

/* Phase sections */
.co-phase{margin-bottom:28px}
.co-phase-header{display:flex;align-items:center;gap:14px;margin-bottom:14px;padding-bottom:12px;border-bottom:1px solid #1e2a3a}
.co-phase-icon{width:40px;height:40px;border-radius:4px;display:flex;align-items:center;justify-content:center;background:rgba(180,83,9,0.08);border:1px solid rgba(180,83,9,0.2)}
.co-phase-icon img{width:20px;height:20px;opacity:0.7}
.co-phase-info h2{color:#e5e7eb;font-size:1.05rem}
.co-phase-info p{color:#4b5563;font-size:0.82rem}

/* ══════════════════════════════════════════════════════════════
   QUIZ / KNOWLEDGE CHECK
   ══════════════════════════════════════════════════════════════ */
.co-quiz{background:#0d1117;border:1px solid #1e2a3a;border-radius:4px;padding:24px;margin-top:18px}
.co-quiz-question{margin-bottom:24px;padding-bottom:24px;border-bottom:1px solid #1e2a3a}
.co-quiz-question:last-of-type{border-bottom:none;margin-bottom:16px;padding-bottom:0}
.co-quiz-question p{font-weight:600;margin-bottom:12px;color:#e5e7eb;font-size:0.92rem}
.co-quiz-option{display:flex;align-items:center;gap:10px;padding:10px 14px;margin:6px 0;background:rgba(255,255,255,0.02);border:1px solid #1e2a3a;border-radius:4px;cursor:pointer;transition:all 0.15s;font-size:0.88rem;color:#9ca3af}
.co-quiz-option:hover{border-color:#374151;color:#c8cdd5;background:rgba(255,255,255,0.04)}
.co-quiz-option input[type="radio"]{accent-color:#d97706}
.co-quiz-option.correct{border-color:#16a34a;background:rgba(22,163,74,0.1);color:#22c55e}
.co-quiz-option.incorrect{border-color:#dc2626;background:rgba(220,38,38,0.1);color:#ef4444}
.co-quiz-btn{padding:10px 28px;background:#b45309;border:none;border-radius:3px;color:#fff;font-weight:700;font-size:0.88rem;cursor:pointer;letter-spacing:0.02em;transition:all 0.2s}
.co-quiz-btn:hover{background:#d97706}
.co-quiz-result{padding:18px;border-radius:4px;margin-top:18px;text-align:center;display:none}
.co-quiz-result.pass{background:rgba(22,163,74,0.08);border:1px solid rgba(22,163,74,0.25)}
.co-quiz-result.pass h3{color:#16a34a}
.co-quiz-result.fail{background:rgba(220,38,38,0.08);border:1px solid rgba(220,38,38,0.25)}
.co-quiz-result.fail h3{color:#dc2626}
.co-quiz-result p{color:#9ca3af;margin-top:6px}

/* ══════════════════════════════════════════════════════════════
   EVALUATION / EXAM
   ══════════════════════════════════════════════════════════════ */
.co-exam-info{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin-top:18px}
.co-exam-stat{background:rgba(255,255,255,0.02);border:1px solid #1e2a3a;border-radius:4px;padding:12px;text-align:center}
.co-exam-stat .label{color:#4b5563;font-size:0.75rem;text-transform:uppercase;letter-spacing:0.06em}
.co-exam-stat .value{color:#d97706;font-size:1.2rem;font-weight:700;margin-top:4px;font-family:'Courier New',monospace}

.co-progress-sticky{display:flex;justify-content:space-between;align-items:center;padding:12px 18px;background:#0d1117;border:1px solid #1e2a3a;border-radius:4px;margin-bottom:18px;position:sticky;top:50px;z-index:90}
.co-progress-sticky .text{color:#6b7280;font-size:0.85rem}
.co-progress-sticky .text span{color:#d97706;font-weight:700}
.co-timer{color:#d97706;font-family:'Courier New',monospace;font-size:1.1rem;font-weight:700}
.co-timer.warning{color:#f59e0b}
.co-timer.danger{color:#ef4444}

.co-question-card{background:rgba(255,255,255,0.02);border:1px solid #1e2a3a;border-radius:4px;padding:22px;margin-bottom:14px;transition:border-color 0.2s}
.co-question-card.answered{border-color:rgba(180,83,9,0.3)}
.co-question-card.correct{border-color:rgba(22,163,74,0.3);background:rgba(22,163,74,0.03)}
.co-question-card.incorrect{border-color:rgba(220,38,38,0.3);background:rgba(220,38,38,0.03)}
.co-question-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:14px}
.co-question-number{background:rgba(180,83,9,0.15);color:#d97706;padding:3px 12px;border-radius:3px;font-size:0.78rem;font-weight:700;letter-spacing:0.04em}
.co-question-topic{color:#4b5563;font-size:0.75rem;padding:3px 10px;background:rgba(255,255,255,0.03);border-radius:3px;font-family:'Courier New',monospace}
.co-question-text{font-size:1rem;line-height:1.65;margin-bottom:18px;color:#e5e7eb}
.co-options{display:grid;gap:8px}
.co-option{padding:12px 16px;background:rgba(255,255,255,0.02);border:1px solid #1e2a3a;border-radius:4px;cursor:pointer;transition:all 0.15s;display:flex;align-items:center;gap:12px;color:#9ca3af;font-size:0.9rem}
.co-option:hover:not(.disabled){border-color:#374151;background:rgba(255,255,255,0.04);color:#c8cdd5}
.co-option.selected{border-color:rgba(180,83,9,0.4);background:rgba(180,83,9,0.08);color:#e5e7eb}
.co-option.correct-answer{border-color:#16a34a;background:rgba(22,163,74,0.1);color:#22c55e}
.co-option.wrong-answer{border-color:#dc2626;background:rgba(220,38,38,0.1);color:#ef4444}
.co-option.disabled{cursor:not-allowed;opacity:0.75}
.co-option-letter{width:26px;height:26px;border-radius:3px;background:rgba(255,255,255,0.05);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:0.82rem;flex-shrink:0;color:#6b7280}
.co-option.selected .co-option-letter{background:rgba(180,83,9,0.2);color:#d97706}
.co-option.correct-answer .co-option-letter{background:#16a34a;color:#fff}
.co-option.wrong-answer .co-option-letter{background:#dc2626;color:#fff}

.co-explanation{margin-top:14px;padding:14px 16px;background:rgba(180,83,9,0.04);border-left:3px solid #b45309;border-radius:0 4px 4px 0;display:none;font-size:0.88rem}
.co-explanation.show{display:block}
.co-explanation h4{color:#d97706;margin-bottom:6px;font-size:0.82rem;text-transform:uppercase;letter-spacing:0.06em}
.co-explanation p{color:#9ca3af;line-height:1.6}

/* Results */
.co-results{display:none;text-align:center;padding:32px;background:#0d1117;border:1px solid rgba(180,83,9,0.3);border-radius:4px;margin-bottom:24px}
.co-results.show{display:block}
.co-results h2{color:#d97706;margin-bottom:20px;font-size:1.1rem;text-transform:uppercase;letter-spacing:0.08em}
.co-score-circle{width:140px;height:140px;border-radius:4px;margin:0 auto 18px;display:flex;flex-direction:column;align-items:center;justify-content:center;border:2px solid}
.co-score-circle.pass{background:rgba(22,163,74,0.06);border-color:rgba(22,163,74,0.3)}
.co-score-circle.fail{background:rgba(220,38,38,0.06);border-color:rgba(220,38,38,0.3)}
.co-score-pct{font-size:2.4rem;font-weight:700;font-family:'Courier New',monospace}
.co-score-circle.pass .co-score-pct{color:#16a34a}
.co-score-circle.fail .co-score-pct{color:#dc2626}
.co-score-frac{font-size:0.9rem;color:#6b7280}
.co-result-msg{font-size:1rem;margin-bottom:24px}
.co-result-msg.pass{color:#16a34a}
.co-result-msg.fail{color:#dc2626}
.co-breakdown{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px;margin:20px 0;text-align:left}
.co-breakdown-item{background:rgba(255,255,255,0.02);border:1px solid #1e2a3a;padding:12px;border-radius:4px}
.co-breakdown-item .category{color:#4b5563;font-size:0.78rem;text-transform:uppercase;letter-spacing:0.06em}
.co-breakdown-item .score{color:#d97706;font-size:1rem;font-weight:700}

/* Submit / CTA */
.co-submit{text-align:center;padding:24px;background:#0d1117;border:1px solid #1e2a3a;border-radius:4px;margin-top:24px}
.co-submit p{color:#6b7280;margin-bottom:16px;font-size:0.88rem}

/* ══════════════════════════════════════════════════════════════
   BUTTONS
   ══════════════════════════════════════════════════════════════ */
.co-btn{padding:10px 28px;border:none;border-radius:3px;font-size:0.88rem;font-weight:700;cursor:pointer;transition:all 0.2s;display:inline-block;text-decoration:none;text-align:center}
.co-btn-primary{background:#b45309;color:#fff}
.co-btn-primary:hover{background:#d97706}
.co-btn-secondary{background:rgba(255,255,255,0.04);color:#9ca3af;border:1px solid #1e2a3a}
.co-btn-secondary:hover{border-color:#374151;color:#c8cdd5}
.co-btn:disabled,.co-btn.locked{opacity:0.4;cursor:not-allowed}
.co-btn:disabled:hover,.co-btn.locked:hover{background:#b45309;transform:none}

/* Evaluation CTA */
.co-eval-cta{background:#0d1117;border:1px solid rgba(180,83,9,0.2);border-radius:4px;padding:28px;text-align:center;margin-top:28px}
.co-eval-cta h2{color:#d97706;margin-bottom:8px;font-size:1rem}
.co-eval-cta p{color:#6b7280;margin-bottom:18px;font-size:0.88rem}
.co-eval-cta .req{margin-top:12px;color:#4b5563;font-size:0.78rem}

/* ══════════════════════════════════════════════════════════════
   LOCKED OVERLAY
   ══════════════════════════════════════════════════════════════ */
.co-locked-overlay{display:none;position:absolute;inset:0;background:rgba(8,11,18,0.96);z-index:1000;align-items:center;justify-content:center}
.co-locked-overlay.show{display:flex}
.co-locked-msg{text-align:center;padding:32px;background:#0d1117;border:1px solid rgba(220,38,38,0.3);border-radius:4px;max-width:460px}
.co-locked-msg h2{color:#dc2626;margin-bottom:12px;font-size:1.1rem}
.co-locked-msg p{color:#6b7280;margin-bottom:18px;font-size:0.9rem}

/* ══════════════════════════════════════════════════════════════
   SOURCE LINK
   ══════════════════════════════════════════════════════════════ */
.co-source{background:#0d1117;border:1px solid #1e2a3a;border-radius:4px;padding:12px 18px;margin-top:24px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}
.co-source span{color:#6b7280;font-size:0.85rem}
.co-source a{color:#d97706;text-decoration:none;padding:6px 16px;background:rgba(180,83,9,0.1);border:1px solid rgba(180,83,9,0.25);border-radius:3px;font-size:0.82rem;font-weight:600;transition:all 0.2s}
.co-source a:hover{background:rgba(180,83,9,0.2);border-color:rgba(180,83,9,0.4)}

/* ══════════════════════════════════════════════════════════════
   FOOTER
   ══════════════════════════════════════════════════════════════ */
.co-footer{text-align:center;padding:24px 0 12px;font-size:0.85rem;border-top:1px solid #1e2a3a;margin-top:32px}
.co-footer a{color:#6b7280;text-decoration:none;transition:color 0.2s}
.co-footer a:hover{color:#d97706}
.co-footer .sep{color:#374151;margin:0 8px}

/* ══════════════════════════════════════════════════════════════
   LEGEND
   ══════════════════════════════════════════════════════════════ */
.co-legend{display:flex;gap:16px;font-size:0.78rem;color:#6b7280;flex-wrap:wrap}
.co-legend-item{display:flex;align-items:center;gap:5px}
.co-legend-dot{width:8px;height:8px;border-radius:2px}
.co-legend-dot.link{background:#16a34a}
.co-legend-dot.wrap{background:#d97706}
.co-legend-dot.create{background:#818cf8}

/* ══════════════════════════════════════════════════════════════
   RESPONSIVE
   ══════════════════════════════════════════════════════════════ */
@media(max-width:768px){
    .co-tabs{flex-direction:column;gap:0}
    .co-tab{border-radius:0;border-bottom:1px solid #1e2a3a}
    .co-tab:last-child{border-bottom:none}
    .co-card-grid{grid-template-columns:1fr}
    .co-table{font-size:0.8rem}
    .co-table th,.co-table td{padding:8px 10px}
    .co-topic-card{grid-template-columns:36px 1fr}
    .co-topic-meta{grid-column:1/-1;flex-direction:row;justify-content:space-between;padding-top:8px;border-top:1px solid #1e2a3a}
    .co-progress-grid{grid-template-columns:1fr 1fr}
    .co-legend{display:none}
    .co-exam-info{grid-template-columns:1fr 1fr}
    .co-question-header{flex-direction:column;gap:8px}
    .co-intro h1{font-size:1.3rem}
}