/* ═══════════════════════════════════ CCNA EXAM SIMULATOR — STYLESHEET ══ */

:root {
  --bg:        #080d1a;
  --bg2:       #0f1629;
  --bg3:       #161f35;
  --card:      #111827;
  --card2:     #1a2540;
  --border:    #1e2d4a;
  --cyan:      #00d4ff;
  --cyan-dim:  #0088aa;
  --magenta:   #ff0080;
  --purple:    #7b2fff;
  --green:     #00e87a;
  --yellow:    #ffc107;
  --red:       #ff3366;
  --text:      #e2e8f0;
  --text-dim:  #7b8fa8;
  --text-code: #a9d1f7;
  --d1: #00d4ff; --d2: #7b2fff; --d3: #00e87a;
  --d4: #ffc107; --d5: #ff3366; --d6: #ff6b2b;
  --radius: 8px;
  --radius-lg: 14px;
  --shadow: 0 4px 24px rgba(0,0,0,.5);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ─── SCREENS ─────────────────────────────────────────────────────────── */
.screen { display: none; }
.screen.active { display: block; }

/* ─── APP HEADER ──────────────────────────────────────────────────────── */
.app-header {
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 16px 32px;
  display: flex;
  align-items: center;
  gap: 16px;
  justify-content: space-between;
}
.logo { display: flex; align-items: center; gap: 14px; }
.logo-icon {
  font-size: 2rem;
  color: var(--cyan);
  text-shadow: 0 0 12px var(--cyan);
}
.logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.05em;
  text-shadow: 0 0 10px var(--cyan-dim);
}
.subtitle { color: var(--text-dim); font-size: 0.8rem; }

/* ─── CARDS ───────────────────────────────────────────────────────────── */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow);
}
.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.card-header h2 { margin: 0; }

/* ─── START MAIN ──────────────────────────────────────────────────────── */
.start-main {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 20px;
  max-width: 1300px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 24px;
  align-items: start;
}
@media (max-width: 900px) {
  .start-main { grid-template-columns: 1fr; }
}
/* Le chapter selector occupe toute la hauteur disponible */
.chapter-card { height: fit-content; }
.chapter-list { max-height: calc(100vh - 280px); overflow-y: auto; }

h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--cyan);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
h3 { font-size: 0.9rem; color: var(--text-dim); margin-bottom: 8px; }

/* ─── QUICK SELECT ────────────────────────────────────────────────────── */
.quick-select-btns { display: flex; flex-wrap: wrap; gap: 6px; }

/* ─── CHAPTER LIST ────────────────────────────────────────────────────── */
.chapter-list { display: flex; flex-direction: column; gap: 4px; }

.section-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 4px;
  cursor: pointer;
  user-select: none;
  border-radius: var(--radius);
  transition: background .15s;
}
.section-header:hover { background: var(--bg3); }
.section-toggle { color: var(--cyan); font-size: 0.85rem; width: 14px; }
.section-title { font-weight: 600; font-size: 0.9rem; color: var(--text); }
.section-count { color: var(--text-dim); font-size: 0.8rem; margin-left: auto; }
.section-cb {
  accent-color: var(--cyan);
  width: 15px; height: 15px;
  cursor: pointer;
  flex-shrink: 0;
}

.day-list { display: none; flex-direction: column; gap: 2px; padding-left: 24px; }
.day-list.open { display: flex; }

.day-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 5px 8px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .12s;
}
.day-item:hover { background: var(--bg3); }
.day-item input[type="checkbox"] { accent-color: var(--cyan); width: 15px; height: 15px; cursor: pointer; }
.day-item label { cursor: pointer; font-size: 0.88rem; color: var(--text-dim); flex: 1; }
.day-item:hover label { color: var(--text); }
.day-q-count { font-size: 0.75rem; color: var(--text-dim); }

/* ─── SETTINGS ────────────────────────────────────────────────────────── */
.settings-card { display: flex; flex-direction: column; gap: 16px; }
.settings-grid { display: flex; flex-direction: column; gap: 14px; }
.setting-item { display: flex; flex-direction: column; gap: 4px; }
.setting-item label {
  font-size: 0.85rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}
.setting-item input[type="number"] {
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 12px;
  border-radius: var(--radius);
  font-size: 1rem;
  width: 120px;
}
.hint { font-size: 0.78rem; color: var(--cyan); }

.domain-legend ul { list-style: none; display: flex; flex-direction: column; gap: 6px; }
.domain-legend li { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; color: var(--text-dim); }

/* ─── DOMAIN BADGES ───────────────────────────────────────────────────── */
.domain-badge {
  padding: 2px 8px;
  border-radius: 99px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}
.domain-badge.d1, .d1 { background: rgba(0,212,255,.15); color: var(--d1); border: 1px solid var(--d1); }
.domain-badge.d2, .d2 { background: rgba(123,47,255,.15); color: var(--d2); border: 1px solid var(--d2); }
.domain-badge.d3, .d3 { background: rgba(0,232,122,.15); color: var(--d3); border: 1px solid var(--d3); }
.domain-badge.d4, .d4 { background: rgba(255,193,7,.15);  color: var(--d4); border: 1px solid var(--d4); }
.domain-badge.d5, .d5 { background: rgba(255,51,102,.15); color: var(--d5); border: 1px solid var(--d5); }
.domain-badge.d6, .d6 { background: rgba(255,107,43,.15); color: var(--d6); border: 1px solid var(--d6); }

/* ─── BUTTONS ─────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: all .15s;
  text-decoration: none;
  white-space: nowrap;
  background: none;
  color: var(--text);
}
.btn-sm { padding: 4px 10px; font-size: 0.78rem; }
.btn-lg { padding: 12px 28px; font-size: 1rem; }
.btn-primary {
  background: var(--cyan);
  color: #000;
  border-color: var(--cyan);
  font-weight: 700;
}
.btn-primary:hover { background: #00b8e0; border-color: #00b8e0; }
.btn-ghost {
  border-color: var(--border);
  color: var(--text-dim);
}
.btn-ghost:hover { border-color: var(--cyan); color: var(--cyan); }
.btn:disabled { opacity: .4; cursor: not-allowed; }

/* ─── EXAM HEADER ─────────────────────────────────────────────────────── */
.exam-header {
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  padding: 10px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.exam-info { display: flex; align-items: center; gap: 10px; min-width: 120px; }
#exam-qnum, #review-qnum { font-size: 0.88rem; color: var(--text-dim); white-space: nowrap; }

.progress-bar-wrap { flex: 1; }
.progress-bar {
  height: 4px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  border-radius: 99px;
  transition: width .3s ease;
  width: 0%;
}

.exam-controls { display: flex; align-items: center; gap: 12px; min-width: 160px; justify-content: flex-end; }
.timer {
  font-family: 'Courier New', monospace;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--cyan);
  background: var(--bg3);
  padding: 4px 12px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  letter-spacing: 0.05em;
}
.timer.warning { color: var(--yellow); border-color: var(--yellow); }
.timer.danger   { color: var(--red);    border-color: var(--red); animation: blink 1s infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:.5} }

/* ─── EXAM MAIN ───────────────────────────────────────────────────────── */
.exam-main {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* ─── QUESTION CARD ───────────────────────────────────────────────────── */
.question-card { display: flex; flex-direction: column; gap: 18px; }

.question-meta { display: flex; align-items: center; gap: 10px; }
.type-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 99px;
  background: rgba(123,47,255,.2);
  color: var(--purple);
  border: 1px solid var(--purple);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.q-topic { font-size: 0.8rem; color: var(--text-dim); }

/* ─── SIMLET ──────────────────────────────────────────────────────────── */
.simlet-scenario {
  font-size: 0.9rem;
  color: var(--text-dim);
  border-left: 3px solid var(--cyan);
  padding-left: 12px;
}
.cli-output {
  background: #050a14;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.82rem;
  color: var(--text-code);
  overflow-x: auto;
  white-space: pre;
  line-height: 1.5;
  max-height: 320px;
  overflow-y: auto;
}

/* ─── QUESTION TEXT ───────────────────────────────────────────────────── */
.question-text {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text);
}

/* ─── CHOICES ─────────────────────────────────────────────────────────── */
.choices-list { display: flex; flex-direction: column; gap: 10px; }
.choice-btn {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all .15s;
  text-align: left;
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.5;
  width: 100%;
}
.choice-btn:hover:not(.disabled) { border-color: var(--cyan); background: rgba(0,212,255,.06); }
.choice-btn.selected { border-color: var(--cyan); background: rgba(0,212,255,.1); }
.choice-btn.correct  { border-color: var(--green); background: rgba(0,232,122,.1); color: var(--green); }
.choice-btn.wrong    { border-color: var(--red);   background: rgba(255,51,102,.1); color: var(--red); }
.choice-btn.missed   { border-color: var(--green); background: rgba(0,232,122,.05); opacity: .7; }
.choice-btn.disabled { cursor: default; }
.choice-letter {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: all .15s;
}
.choice-btn.selected .choice-letter { background: var(--cyan); color: #000; }
.choice-btn.correct  .choice-letter { background: var(--green); color: #000; }
.choice-btn.wrong    .choice-letter { background: var(--red); color: #fff; }
.choice-btn.missed   .choice-letter { background: var(--green); color: #000; }

.multi-hint { font-size: 0.82rem; color: var(--yellow); font-style: italic; }

/* ─── DRAG & DROP ─────────────────────────────────────────────────────── */
.dd-instructions { font-size: 0.88rem; color: var(--text-dim); }
.dd-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 12px; }
@media (max-width: 600px) { .dd-layout { grid-template-columns: 1fr; } }

.dd-items-pool {
  background: var(--bg3);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 12px;
  min-height: 80px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-content: flex-start;
}
.dd-targets { display: flex; flex-direction: column; gap: 8px; }
.dd-target {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  min-height: 50px;
  transition: border-color .15s;
}
.dd-target.drag-over { border-color: var(--cyan); background: rgba(0,212,255,.06); }
.dd-target.correct   { border-color: var(--green); }
.dd-target.wrong     { border-color: var(--red); }
.dd-target-label {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 6px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.dd-chip {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  background: var(--card2);
  border: 1px solid var(--border);
  border-radius: 99px;
  font-size: 0.85rem;
  cursor: grab;
  user-select: none;
  transition: all .15s;
  color: var(--text);
}
.dd-chip:hover { border-color: var(--cyan); color: var(--cyan); }
.dd-chip.dragging { opacity: .5; }
.dd-chip.placed-correct { border-color: var(--green); color: var(--green); background: rgba(0,232,122,.1); }
.dd-chip.placed-wrong   { border-color: var(--red);   color: var(--red);   background: rgba(255,51,102,.1); }

/* ─── DD REVIEW ───────────────────────────────────────────────────────── */
.dd-review { display: flex; flex-direction: column; gap: 8px; }
.dd-review-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius);
  font-size: 0.9rem;
}
.dd-review-row.correct { background: rgba(0,232,122,.1); border: 1px solid var(--green); }
.dd-review-row.wrong   { background: rgba(255,51,102,.1); border: 1px solid var(--red); }
.dd-arrow { color: var(--text-dim); }

/* ─── NAV DOTS ────────────────────────────────────────────────────────── */
.exam-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.nav-dots {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  justify-content: center;
  max-width: 600px;
  overflow: hidden;
}
.nav-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--border);
  cursor: pointer;
  transition: all .15s;
  flex-shrink: 0;
}
.nav-dot:hover    { background: var(--text-dim); }
.nav-dot.current  { background: var(--cyan); box-shadow: 0 0 6px var(--cyan); }
.nav-dot.answered { background: var(--purple); }
.nav-dot.flagged  { background: var(--yellow); }
.nav-dot.correct  { background: var(--green); }
.nav-dot.wrong    { background: var(--red); }

.exam-submit { display: flex; justify-content: center; }

/* ─── STATUS BADGE ────────────────────────────────────────────────────── */
.status-badge {
  padding: 2px 10px;
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 700;
}
.status-badge.correct { background: rgba(0,232,122,.15); color: var(--green); border: 1px solid var(--green); }
.status-badge.wrong   { background: rgba(255,51,102,.15); color: var(--red);   border: 1px solid var(--red); }
.status-badge.skipped { background: rgba(123,47,255,.15); color: var(--purple); border: 1px solid var(--purple); }

/* ─── RESULTS ─────────────────────────────────────────────────────────── */
.results-main {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.score-hero { text-align: center; padding: 36px 24px; }
.verdict {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.verdict.pass { color: var(--green); text-shadow: 0 0 20px rgba(0,232,122,.4); }
.verdict.fail { color: var(--red);   text-shadow: 0 0 20px rgba(255,51,102,.4); }
.score-big  { font-size: 3.5rem; font-weight: 900; color: var(--text); line-height: 1; }
.score-pct  { font-size: 1.2rem; color: var(--text-dim); margin: 4px 0 12px; }
.score-note { font-size: 0.82rem; color: var(--text-dim); }

.domain-scores { display: flex; flex-direction: column; gap: 12px; }
.domain-score-row { display: flex; flex-direction: column; gap: 6px; }
.domain-score-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
}
.domain-score-bar {
  height: 8px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
}
.domain-score-fill {
  height: 100%;
  border-radius: 99px;
  transition: width .5s ease;
}

.question-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  max-height: 180px;
  overflow-y: auto;
}
.summary-dot {
  width: 32px;
  height: 32px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform .1s;
}
.summary-dot:hover { transform: scale(1.15); }
.summary-dot.correct { background: rgba(0,232,122,.2); color: var(--green); border: 1px solid var(--green); }
.summary-dot.wrong   { background: rgba(255,51,102,.2); color: var(--red);   border: 1px solid var(--red); }
.summary-dot.skipped { background: rgba(123,47,255,.2); color: var(--purple); border: 1px solid var(--purple); }

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

/* ─── EXPLANATION ─────────────────────────────────────────────────────── */
.explanation-box {
  background: rgba(123,47,255,.08);
  border: 1px solid var(--purple);
  border-radius: var(--radius);
  padding: 16px 20px;
}
.explanation-box h3 {
  font-size: 0.8rem;
  color: var(--purple);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}
.explanation-box p { font-size: 0.9rem; color: var(--text); line-height: 1.6; }

.review-mode .choice-btn { cursor: default; }

/* ─── MODAL ───────────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}
.modal-overlay[hidden] { display: none; }
.modal-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  max-width: 400px;
  width: 90%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,.8);
}
.modal-box p { margin-bottom: 20px; font-size: 1rem; color: var(--text); }
.modal-actions { display: flex; gap: 12px; justify-content: center; }

/* ─── SCROLLBARS ──────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--cyan-dim); }

/* ─── FLAG BUTTON ─────────────────────────────────────────────────────── */
#flag-btn.flagged { color: var(--yellow); border-color: var(--yellow); }

/* ═══════════════════════════════════════════ DIFFICULTY BADGES ═════════ */
.diff-badge {
  font-size: 0.7rem; font-weight: 700; padding: 2px 7px;
  border-radius: 99px; letter-spacing: .05em; text-transform: uppercase;
}
.diff-easy   { background: rgba(0,232,122,.15); color: var(--green);  border: 1px solid rgba(0,232,122,.3); }
.diff-medium { background: rgba(255,193,7,.12);  color: var(--yellow); border: 1px solid rgba(255,193,7,.3); }
.diff-hard   { background: rgba(255,51,102,.12); color: var(--red);    border: 1px solid rgba(255,51,102,.3); }

/* ─── Difficulty filter checkboxes ──────────────────────────────────────── */
.difficulty-filter {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  margin-top: 4px;
}
.difficulty-filter label {
  display: flex; align-items: center; gap: 6px;
  cursor: pointer; font-size: 0.88rem; color: var(--text-dim);
}
.difficulty-filter input[type="checkbox"] {
  accent-color: var(--cyan); width: 14px; height: 14px; cursor: pointer;
}

/* ═══════════════════════════════════════════ ADAPTIVE BADGE ════════════ */
.adaptive-badge {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 0.72rem; color: var(--cyan); background: rgba(0,212,255,.08);
  border: 1px solid rgba(0,212,255,.25); border-radius: 99px;
  padding: 2px 8px; letter-spacing: .04em;
}


/* ═══════════════════════════════════════════ SEED SYSTEM ═══════════════ */
.seed-section {
  padding: .65rem 0 .1rem;
  border-top: 1px solid var(--border);
  margin-top: .6rem;
}
.seed-row {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-wrap: wrap;
}
.seed-label {
  font-size: .82rem;
  color: var(--text-dim);
  white-space: nowrap;
  min-width: 88px;
}
.seed-controls {
  display: flex;
  align-items: center;
  gap: .3rem;
  flex: 1;
}
.seed-input {
  flex: 1;
  min-width: 0;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--cyan);
  font-family: monospace;
  font-size: .82rem;
  padding: .3rem .5rem;
  letter-spacing: .06em;
}
.seed-input:focus {
  outline: none;
  border-color: var(--cyan-dim);
}
.seed-input::placeholder { color: var(--text-dim); letter-spacing: 0; }
.seed-result-box { padding: 16px 20px; }
.seed-result-row {
  display: flex;
  align-items: center;
  gap: .75rem;
  flex-wrap: wrap;
}
.seed-result-label {
  font-size: .85rem;
  color: var(--text-dim);
}
.seed-code {
  font-family: monospace;
  font-size: .95rem;
  color: var(--cyan);
  letter-spacing: .08em;
  background: var(--bg3);
  padding: .2rem .55rem;
  border-radius: 4px;
}

/* ═══════════════════════════════════════════ APP NAV BAR ═══════════ */
.app-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 0;
  background: rgba(8,13,26,.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 20px;
  height: 52px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 160px;
}
.nav-logo-text {
  font-size: .9rem;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: .05em;
  text-shadow: 0 0 8px var(--cyan-dim);
}
.nav-tabs {
  display: flex;
  align-items: stretch;
  flex: 1;
}
.nav-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 18px;
  height: 52px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  font-size: .88rem;
  font-weight: 500;
  cursor: pointer;
  transition: color .15s, border-color .15s;
  white-space: nowrap;
}
.nav-tab:hover { color: var(--text); }
.nav-tab.active { color: var(--cyan); border-bottom-color: var(--cyan); }
.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 160px;
  justify-content: flex-end;
}
.user-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 4px 6px 4px 12px;
  font-size: .8rem;
  color: var(--text-dim);
}
.user-email {
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.user-logout-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 1rem;
  padding: 2px 6px;
  border-radius: 99px;
  transition: color .15s;
}
.user-logout-btn:hover { color: var(--red); }
@media (max-width: 700px) {
  .nav-logo-text { display: none; }
  .nav-tab { padding: 0 10px; font-size: .78rem; }
}

/* ═══════════════════════════════════════════ HOME SCREEN ═══════════ */
.home-main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Stat cards */
.stat-cards-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
@media (max-width: 700px) { .stat-cards-row { grid-template-columns: repeat(2, 1fr); } }
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  text-align: center;
  transition: border-color .15s, box-shadow .15s, transform .12s;
}
.stat-card:hover {
  border-color: var(--cyan);
  box-shadow: 0 0 16px rgba(0,212,255,.12);
  transform: translateY(-2px);
}
.stat-card-icon { font-size: 1.3rem; }
.stat-card-val {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--cyan);
  line-height: 1.2;
}
.stat-card-lbl { font-size: .73rem; color: var(--text-dim); }

/* Action cards */
.home-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
@media (max-width: 600px) { .home-actions { grid-template-columns: 1fr; } }
.action-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  transition: border-color .15s, box-shadow .15s, transform .12s;
}
.action-card:hover {
  border-color: var(--cyan);
  box-shadow: 0 0 16px rgba(0,212,255,.1);
  transform: translateY(-2px);
}
.action-icon    { font-size: 2rem; flex-shrink: 0; }
.action-content { flex: 1; }
.action-title   { font-size: 1.05rem; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.action-desc    { font-size: .82rem; color: var(--text-dim); line-height: 1.4; }
.action-arrow   { color: var(--cyan); font-size: 1.2rem; flex-shrink: 0; }

/* Recent sessions card */
.home-recent.card { padding: 0; overflow: hidden; }
.home-recent-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  border-bottom: 1px solid var(--border);
  font-size: .88rem;
  font-weight: 600;
  color: var(--text-dim);
}
.home-recent-empty {
  padding: 20px 18px;
  font-size: .85rem;
  color: var(--text-dim);
  text-align: center;
  font-style: italic;
}
.home-recent-stats {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px 4px;
  font-size: .82rem;
  color: var(--text-dim);
  flex-wrap: wrap;
}
.home-sparkline { padding: 4px 18px 12px; }

/* ═══════════════════════════════════════════ EXAM CONFIG SCREEN ════ */
.exam-config-main {
  max-width: 1300px;
  margin: 0 auto;
  padding: 20px 24px;
}
.exam-config-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 20px;
  align-items: start;
}
@media (max-width: 900px) { .exam-config-layout { grid-template-columns: 1fr; } }

/* View toggle Jeremy / Neil */
.exam-view-toggle {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.exam-view-btn {
  flex: 1;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-dim);
  font-size: .82rem;
  padding: 7px 10px;
  cursor: pointer;
  transition: all .15s;
}
.exam-view-btn:hover { border-color: var(--cyan-dim); color: var(--text); }
.exam-view-btn.active {
  background: rgba(0,212,255,.1);
  border-color: var(--cyan);
  color: var(--cyan);
  font-weight: 600;
}

/* Neil chapter list */
.neil-chapter-list {
  display: flex;
  flex-direction: column;
  gap: 3px;
  max-height: calc(100vh - 330px);
  overflow-y: auto;
}
.neil-section-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .12s;
}
.neil-section-item:hover { background: var(--bg3); }
.neil-section-item label { cursor: pointer; font-size: .88rem; color: var(--text-dim); flex: 1; }
.neil-section-item:hover label { color: var(--text); }
.neil-section-item input[type="checkbox"] {
  accent-color: var(--cyan);
  width: 15px; height: 15px;
  cursor: pointer; flex-shrink: 0;
}

/* Settings sections inside settings card */
.settings-section {
  padding: 12px 0;
  border-top: 1px solid var(--border);
}
.settings-section + .settings-section { /* keep separator between sections */ }
.settings-section-title {
  font-size: .68rem;
  font-weight: 700;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: .12em;
  margin-bottom: 10px;
}
.settings-row {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.settings-row .setting-item { flex: 1; min-width: 100px; }

/* Custom toggle switch */
.toggle {
  position: relative;
  display: inline-block;
  width: 40px; height: 22px;
  flex-shrink: 0;
}
.toggle input { opacity: 0; width: 0; height: 0; position: absolute; }
.toggle-track {
  position: absolute;
  inset: 0;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 99px;
  transition: background .2s, border-color .2s;
  cursor: pointer;
}
.toggle-track::before {
  content: '';
  position: absolute;
  width: 16px; height: 16px;
  left: 2px; top: 2px;
  background: var(--text-dim);
  border-radius: 50%;
  transition: transform .2s, background .2s;
}
.toggle input:checked + .toggle-track {
  background: rgba(0,212,255,.18);
  border-color: var(--cyan);
}
.toggle input:checked + .toggle-track::before {
  transform: translateX(18px);
  background: var(--cyan);
}
.toggle-setting {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 5px 0;
  cursor: pointer;
  font-size: .88rem;
  color: var(--text-dim);
  user-select: none;
}
.toggle-setting:hover { color: var(--text); }

/* Pill toggle (difficulty) */
.pill-toggle { cursor: pointer; display: inline-flex; align-items: center; }
.pill-toggle input { position: absolute; opacity: 0; width: 0; height: 0; }
.pill-toggle:has(input:not(:checked)) .diff-badge { opacity: .4; }
.pill-toggle .diff-badge { transition: opacity .15s; cursor: pointer; }

/* Seed collapsible */
.seed-details {
  border-top: 1px solid var(--border);
  padding-top: 10px;
}
.seed-details summary {
  cursor: pointer;
  font-size: .88rem;
  font-weight: 600;
  color: var(--text-dim);
  list-style: none;
  padding: 4px 0;
  user-select: none;
}
.seed-details summary::before { content: '▶ '; font-size: .7rem; }
.seed-details[open] summary::before { content: '▼ '; }

/* ═══════════════════════════════════════════ FC CONFIG SCREEN ══════ */
.fc-config-main {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.step-header {
  display: flex;
  align-items: center;
  gap: 12px;
}
.step-num {
  width: 32px; height: 32px;
  background: rgba(0,212,255,.1);
  border: 1px solid var(--cyan);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  color: var(--cyan);
  flex-shrink: 0;
}
.step-label {
  font-size: .72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--text-dim);
}

/* FC source selection cards */
.fc-source-cards {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.fc-source-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.fc-source-card:hover { border-color: var(--cyan-dim); }
.fc-source-card.selected {
  border-color: var(--cyan);
  background: rgba(0,212,255,.07);
}

/* FC view toggle (Jeremy/Neil) */
.fc-view-toggle {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
}
.fc-view-btn {
  flex: 1;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-dim);
  font-size: .82rem;
  padding: 7px 10px;
  cursor: pointer;
  transition: all .15s;
}
.fc-view-btn:hover { border-color: var(--cyan-dim); color: var(--text); }
.fc-view-btn.active {
  background: rgba(0,212,255,.1);
  border-color: var(--cyan);
  color: var(--cyan);
  font-weight: 600;
}

/* FC launch bar */
.fc-launch-bar {
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

/* ═══════════════════════════════════════════ STATS SCREEN ══════════ */
.stats-main {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - 52px);
}
.stats-tabs {
  display: flex;
  align-items: stretch;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
  padding: 0 24px;
  flex-shrink: 0;
}
.stats-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 14px 20px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-dim);
  font-size: .88rem;
  font-weight: 500;
  cursor: pointer;
  transition: color .15s, border-color .15s;
  white-space: nowrap;
}
.stats-tab:hover { color: var(--text); }
.stats-tab.active { color: var(--cyan); border-bottom-color: var(--cyan); }
.stats-panel {
  overflow-y: auto;
  flex: 1;
  padding: 20px 24px;
}
.stats-footer {
  padding: 14px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  flex-shrink: 0;
}

/* ═══════════════════════════════════════════ MISC / UTILS ══════════ */
.diff-neil {
  background: rgba(123,47,255,.15);
  color: var(--purple);
  border: 1px solid var(--purple);
}
.text-dim   { color: var(--text-dim); }
.text-green { color: var(--green); }
.text-red   { color: var(--red); }