@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700&family=JetBrains+Mono:wght@400;700&display=swap');

/* ================================================================
   FE Simulacro Exam — Engineering Terminal dark theme
   ================================================================ */

.sim-wrap {
  /* ── Palette ── */
  --sim-bg:           #08111d;
  --sim-surface:      #0d1a27;
  --sim-surface-2:    #112030;
  --sim-surface-3:    #162638;
  --sim-border:       rgba(94,158,220,0.13);
  --sim-border-2:     rgba(94,158,220,0.24);
  --sim-ink:          #cddcec;
  --sim-ink-2:        #7f9bb5;
  --sim-muted:        #435a70;
  --sim-faint:        rgba(94,158,220,0.05);

  /* ── Accent ── */
  --sim-accent:       #3a9eff;
  --sim-accent-bg:    rgba(58,158,255,0.10);
  --sim-accent-h:     #1a82e5;
  --sim-accent-glow:  rgba(58,158,255,0.22);

  /* ── States ── */
  --sim-ok:           #00cfa8;
  --sim-ok-bg:        rgba(0,207,168,0.10);
  --sim-ok-border:    rgba(0,207,168,0.32);
  --sim-bad:          #ff5060;
  --sim-bad-bg:       rgba(255,80,96,0.10);
  --sim-bad-border:   rgba(255,80,96,0.32);
  --sim-warn:         #f5a623;
  --sim-warn-bg:      rgba(245,166,35,0.10);
  --sim-flag:         #f5a623;

  /* ── Shape ── */
  --sim-radius:       8px;
  --sim-radius-sm:    5px;

  font-family: 'Outfit', -apple-system, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--sim-ink);
  background: var(--sim-bg);
  border: 1px solid rgba(58,158,255,0.18);
  border-radius: 14px;
  box-shadow:
    0 0 0 1px rgba(58,158,255,0.06),
    0 32px 80px rgba(0,0,0,0.75),
    0 4px 20px rgba(0,0,0,0.5);
  min-height: 500px;
  overflow: hidden;
  background-image:
    linear-gradient(rgba(58,158,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(58,158,255,0.025) 1px, transparent 1px);
  background-size: 48px 48px;
}

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

/* ── Cover page ───────────────────────────────────────────────── */
.sim-cover {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 52px 28px;
  text-align: center;
  min-height: 560px;
  position: relative;
}

.sim-cover::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 50% at 50% 30%, rgba(58,158,255,0.07) 0%, transparent 70%);
  pointer-events: none;
}

.sim-cover-logo {
  font-size: 48px;
  margin-bottom: 18px;
  filter: drop-shadow(0 0 16px rgba(58,158,255,0.5));
}

.sim-cover-title {
  font-family: 'Outfit', sans-serif;
  font-size: 26px;
  font-weight: 700;
  color: var(--sim-ink) !important;
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.sim-cover-sub {
  font-size: 13px;
  color: var(--sim-ink-2) !important;
  margin-bottom: 32px;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.04em;
}

.sim-cover-info {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  max-width: 460px;
  width: 100%;
  margin-bottom: 32px;
}

.sim-info-card {
  background: var(--sim-surface);
  border: 1px solid var(--sim-border-2);
  border-radius: var(--sim-radius);
  padding: 14px 10px;
  text-align: center;
  transition: border-color 0.2s;
}

.sim-info-card:hover { border-color: var(--sim-accent-glow); }

.sim-info-card-val {
  font-family: 'JetBrains Mono', monospace;
  font-size: 22px;
  font-weight: 700;
  color: var(--sim-accent) !important;
}

.sim-info-card-lbl {
  font-size: 10px;
  color: var(--sim-muted) !important;
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-family: 'JetBrains Mono', monospace;
}

.sim-cover-instructions {
  background: var(--sim-surface);
  border: 1px solid var(--sim-border-2);
  border-radius: var(--sim-radius);
  padding: 18px 22px;
  max-width: 520px;
  width: 100%;
  text-align: left;
  margin-bottom: 32px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--sim-ink-2) !important;
}

.sim-cover-instructions strong { color: var(--sim-ink) !important; }
.sim-cover-instructions ul { padding-left: 18px; margin-top: 6px; }
.sim-cover-instructions li { margin-bottom: 4px; }

.sim-btn-start {
  background: var(--sim-accent);
  color: #fff;
  border: none;
  border-radius: var(--sim-radius);
  padding: 14px 44px;
  font-size: 15px;
  font-weight: 700;
  font-family: 'Outfit', sans-serif;
  cursor: pointer;
  letter-spacing: 0.02em;
  transition: background 0.15s, box-shadow 0.15s, transform 0.12s;
  box-shadow: 0 0 18px rgba(58,158,255,0.35);
}

.sim-btn-start:hover {
  background: var(--sim-accent-h);
  box-shadow: 0 0 28px rgba(58,158,255,0.55);
  transform: translateY(-1px);
}

/* ── Header ──────────────────────────────────────────────────── */
.sim-header {
  background: rgba(8,17,29,0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--sim-border);
  color: var(--sim-ink);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 11px 20px;
  flex-wrap: wrap;
  gap: 8px;
  position: sticky;
  top: 0;
  z-index: 20;
}

.sim-header-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--sim-ink-2) !important;
  font-family: 'JetBrains Mono', monospace;
}

.sim-header-timer {
  font-family: 'JetBrains Mono', monospace;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--sim-accent) !important;
  background: var(--sim-accent-bg);
  border: 1px solid rgba(58,158,255,0.22);
  border-radius: var(--sim-radius-sm);
  padding: 4px 12px;
}

.sim-header-timer.is-warn { color: var(--sim-warn) !important; background: var(--sim-warn-bg); border-color: rgba(245,166,35,0.22); }
.sim-header-timer.is-danger { color: var(--sim-bad) !important; background: var(--sim-bad-bg); border-color: var(--sim-bad-border); animation: sim-blink .8s step-start infinite; }
@keyframes sim-blink { 50% { opacity: .4; } }

/* ── Progress bar ────────────────────────────────────────────── */
.sim-progress-bar-wrap {
  background: rgba(58,158,255,0.08);
  height: 3px;
}

.sim-progress-bar {
  height: 3px;
  background: linear-gradient(90deg, var(--sim-accent), var(--sim-ok));
  transition: width 0.3s;
  box-shadow: 0 0 8px rgba(58,158,255,0.6);
}

/* ── Navigation strip ────────────────────────────────────────── */
.sim-nav {
  background: var(--sim-surface);
  border-bottom: 1px solid var(--sim-border);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  flex-wrap: wrap;
}

.sim-nav-btn {
  background: var(--sim-surface-2);
  border: 1px solid var(--sim-border-2);
  border-radius: var(--sim-radius-sm);
  padding: 6px 14px;
  font-size: 12px;
  font-family: 'Outfit', sans-serif;
  font-weight: 600;
  color: var(--sim-ink-2);
  cursor: pointer;
  transition: all 0.13s;
  display: flex;
  align-items: center;
  gap: 5px;
}

.sim-nav-btn:hover:not(:disabled) {
  background: var(--sim-accent-bg);
  border-color: var(--sim-accent);
  color: var(--sim-accent);
  box-shadow: 0 0 10px var(--sim-accent-glow);
}

.sim-nav-btn:disabled { opacity: 0.3; cursor: not-allowed; }

.sim-nav-btn.is-flag {
  border-color: rgba(245,166,35,0.4);
  color: var(--sim-flag);
}

.sim-nav-btn.is-flag.active {
  background: rgba(245,166,35,0.15);
  border-color: var(--sim-flag);
  color: var(--sim-flag);
}

.sim-nav-btn.active {
  background: var(--sim-accent-bg);
  border-color: var(--sim-accent);
  color: var(--sim-accent);
}

.sim-nav-q-counter {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--sim-muted) !important;
  margin-left: auto;
  font-weight: 700;
}

/* ── Question pane ───────────────────────────────────────────── */
.sim-body {
  padding: 28px 24px 40px;
  max-width: 800px;
  margin: 0 auto;
}

.sim-q-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--sim-muted) !important;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.sim-q-topic-badge {
  display: inline-block;
  background: var(--sim-accent-bg);
  color: var(--sim-accent) !important;
  border: 1px solid rgba(58,158,255,0.28);
  border-radius: var(--sim-radius-sm);
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 700;
  padding: 3px 9px;
  margin-bottom: 14px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.sim-q-text {
  font-size: 16px;
  line-height: 1.65;
  color: var(--sim-ink) !important;
  margin-bottom: 24px;
}

.sim-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sim-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background: var(--sim-surface);
  border: 1px solid var(--sim-border-2);
  border-radius: var(--sim-radius);
  padding: 13px 16px;
  cursor: pointer;
  transition: all 0.13s;
}

.sim-option:hover {
  border-color: var(--sim-accent);
  background: var(--sim-accent-bg);
  box-shadow: 0 0 0 1px var(--sim-accent-glow);
}

.sim-option.is-selected {
  border-color: var(--sim-accent);
  background: var(--sim-accent-bg);
  box-shadow: 0 0 0 1px var(--sim-accent-glow), 0 0 12px var(--sim-accent-glow);
}

.sim-option input[type="radio"] { display: none; }

.sim-option-letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--sim-border-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
  color: var(--sim-muted);
  transition: all 0.13s;
}

.sim-option:hover .sim-option-letter {
  border-color: var(--sim-accent);
  color: var(--sim-accent);
}

.sim-option.is-selected .sim-option-letter {
  background: var(--sim-accent);
  border-color: var(--sim-accent);
  color: #fff;
  box-shadow: 0 0 8px rgba(58,158,255,0.5);
}

.sim-option-text {
  font-size: 14px;
  line-height: 1.55;
  color: var(--sim-ink) !important;
  padding-top: 4px;
}

.sim-q-text sub, .sim-q-text sup,
.sim-option-text sub, .sim-option-text sup {
  font-size: 0.75em;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}
.sim-q-text sup, .sim-option-text sup { top: -0.45em; }
.sim-q-text sub, .sim-option-text sub { bottom: -0.25em; }

/* ── Question grid (review) ──────────────────────────────────── */
.sim-review { padding: 24px 20px; }

.sim-review-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--sim-ink) !important;
  margin-bottom: 6px;
  font-family: 'Outfit', sans-serif;
}

.sim-review-sub {
  font-size: 13px;
  color: var(--sim-ink-2) !important;
  margin-bottom: 20px;
  font-family: 'JetBrains Mono', monospace;
}

.sim-q-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(54px, 1fr));
  gap: 8px;
  margin-bottom: 24px;
}

.sim-q-cell {
  width: 54px;
  height: 46px;
  background: var(--sim-surface);
  border: 1px solid var(--sim-border-2);
  border-radius: var(--sim-radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.13s;
  color: var(--sim-ink-2);
}

.sim-q-cell:hover { border-color: var(--sim-accent); color: var(--sim-accent); background: var(--sim-accent-bg); }
.sim-q-cell.is-answered { background: var(--sim-accent-bg); border-color: var(--sim-accent); color: var(--sim-accent); }
.sim-q-cell.is-flagged { border-color: var(--sim-flag); color: var(--sim-flag); }
.sim-q-cell.is-flagged.is-answered { background: var(--sim-accent-bg); border-color: var(--sim-flag); border-width: 2px; color: var(--sim-accent); }

.sim-q-cell-num { font-size: 12px; }
.sim-q-cell-ans { font-size: 10px; opacity: 0.8; }

.sim-review-legend {
  display: flex;
  gap: 18px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.sim-legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--sim-muted) !important;
}

.sim-legend-swatch {
  width: 16px;
  height: 16px;
  border-radius: 3px;
  border: 1px solid var(--sim-border-2);
  background: var(--sim-surface);
}

.sim-legend-swatch.answered { background: var(--sim-accent-bg); border-color: var(--sim-accent); }
.sim-legend-swatch.unanswered { background: var(--sim-surface); }
.sim-legend-swatch.flagged { border-color: var(--sim-flag); border-width: 2px; }

.sim-review-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ── Complete screen ─────────────────────────────────────────── */
.sim-complete {
  padding: 36px 28px;
  text-align: center;
  position: relative;
}

.sim-complete::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 55% 45% at 50% 20%, rgba(58,158,255,0.07) 0%, transparent 70%);
  pointer-events: none;
}

.sim-complete-icon {
  font-size: 52px;
  margin-bottom: 14px;
  filter: drop-shadow(0 0 18px rgba(58,158,255,0.45));
}

.sim-complete-title {
  font-family: 'Outfit', sans-serif;
  font-size: 22px;
  font-weight: 700;
  color: var(--sim-ink) !important;
  margin-bottom: 4px;
}

.sim-complete-sub {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--sim-ink-2) !important;
  margin-bottom: 28px;
  letter-spacing: 0.04em;
}

.sim-name-form {
  max-width: 400px;
  margin: 0 auto 28px;
  text-align: left;
}

.sim-name-label {
  font-size: 11px;
  font-weight: 700;
  font-family: 'JetBrains Mono', monospace;
  color: var(--sim-ink-2) !important;
  display: block;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.sim-name-input {
  width: 100%;
  padding: 10px 13px;
  font-size: 15px;
  font-family: 'Outfit', sans-serif;
  background: var(--sim-surface);
  color: var(--sim-ink);
  border: 1px solid var(--sim-border-2);
  border-radius: var(--sim-radius);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.sim-name-input:focus {
  border-color: var(--sim-accent);
  box-shadow: 0 0 0 3px var(--sim-accent-glow);
}

.sim-name-hint {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--sim-muted) !important;
  margin-top: 5px;
}

.sim-complete-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.sim-score-preview {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  max-width: 420px;
  margin: 0 auto 28px;
}

.sim-score-card {
  background: var(--sim-surface);
  border: 1px solid var(--sim-border-2);
  border-radius: var(--sim-radius);
  padding: 16px 10px;
  text-align: center;
  transition: border-color 0.15s;
}

.sim-score-card:hover { border-color: var(--sim-accent-glow); }

.sim-score-val {
  font-family: 'JetBrains Mono', monospace;
  font-size: 26px;
  font-weight: 700;
  color: var(--sim-ink) !important;
}

.sim-score-lbl {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--sim-muted) !important;
  margin-top: 4px;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

/* ── Shared buttons ──────────────────────────────────────────── */
.sim-btn {
  border: none;
  border-radius: var(--sim-radius);
  padding: 10px 22px;
  font-size: 13px;
  font-weight: 700;
  font-family: 'Outfit', sans-serif;
  cursor: pointer;
  transition: all 0.13s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.02em;
}

.sim-btn-primary {
  background: var(--sim-accent);
  color: #fff;
  box-shadow: 0 0 14px rgba(58,158,255,0.3);
}

.sim-btn-primary:hover {
  background: var(--sim-accent-h);
  box-shadow: 0 0 22px rgba(58,158,255,0.5);
  transform: translateY(-1px);
}

.sim-btn-primary:disabled { opacity: 0.4; cursor: not-allowed; transform: none; box-shadow: none; }

.sim-btn-success {
  background: var(--sim-ok);
  color: #fff;
  box-shadow: 0 0 12px rgba(0,207,168,0.25);
}

.sim-btn-success:hover {
  background: #00b596;
  box-shadow: 0 0 20px rgba(0,207,168,0.45);
  transform: translateY(-1px);
}

.sim-btn-ghost {
  background: var(--sim-surface-2);
  color: var(--sim-ink-2);
  border: 1px solid var(--sim-border-2);
}

.sim-btn-ghost:hover {
  background: var(--sim-accent-bg);
  border-color: var(--sim-accent);
  color: var(--sim-accent);
  box-shadow: 0 0 10px var(--sim-accent-glow);
}

.sim-btn-danger {
  background: var(--sim-bad-bg);
  color: var(--sim-bad);
  border: 1px solid var(--sim-bad-border);
}

.sim-btn-danger:hover {
  background: var(--sim-bad);
  color: #fff;
  box-shadow: 0 0 14px rgba(255,80,96,0.4);
}

/* ── Unanswered warning ──────────────────────────────────────── */
.sim-warn-box {
  background: rgba(245,166,35,0.08);
  border: 1px solid rgba(245,166,35,0.30);
  border-radius: var(--sim-radius);
  padding: 12px 16px;
  font-size: 13px;
  color: var(--sim-warn) !important;
  margin-bottom: 18px;
  display: none;
  font-family: 'JetBrains Mono', monospace;
}

.sim-warn-box.visible { display: block; }

/* ── Score color ─────────────────────────────────────────────── */
.sim-score-val.is-pass   { color: var(--sim-ok)  !important; text-shadow: 0 0 12px rgba(0,207,168,0.4); }
.sim-score-val.is-borderline { color: var(--sim-warn) !important; text-shadow: 0 0 12px rgba(245,166,35,0.4); }
.sim-score-val.is-fail   { color: var(--sim-bad)  !important; text-shadow: 0 0 12px rgba(255,80,96,0.4); }

/* ── Math expression display ─────────────────────────────────── */
.sim-math-display {
  display: inline-flex;
  align-items: center;
  font-family: 'Times New Roman', Georgia, serif;
  font-size: 1.15em;
  margin: 10px 0 4px;
  gap: 2px;
  line-height: 1;
  color: var(--sim-ink);
}

.sim-integral-wrap { display: inline-flex; align-items: center; }

.sim-int-sign { font-size: 2.6em; line-height: 0.9; padding: 0 1px; }

.sim-int-limits {
  display: inline-flex;
  flex-direction: column;
  font-size: 0.72em;
  line-height: 1.2;
  margin-left: 1px;
}

.sim-int-limits sup,
.sim-int-limits sub { position: static; font-size: 1em; line-height: 1.15; vertical-align: baseline; }

.sim-integrand { font-size: 1.05em; margin-left: 3px; letter-spacing: 0.01em; }

/* ── Matrix display ──────────────────────────────────────────── */
.sim-matrix-wrap {
  display: inline-block;
  vertical-align: middle;
  position: relative;
  margin: 8px 14px;
}

.sim-matrix-wrap::before {
  content: '';
  position: absolute;
  left: -10px; top: 0; bottom: 0; width: 8px;
  border: 2px solid var(--sim-ink-2);
  border-right: none;
  border-radius: 2px 0 0 2px;
}

.sim-matrix-wrap::after {
  content: '';
  position: absolute;
  right: -10px; top: 0; bottom: 0; width: 8px;
  border: 2px solid var(--sim-ink-2);
  border-left: none;
  border-radius: 0 2px 2px 0;
}

.sim-matrix { border-collapse: separate; border-spacing: 0; }

.sim-matrix td {
  padding: 5px 14px;
  text-align: center;
  font-size: 15px;
  font-family: 'Times New Roman', Georgia, serif;
  color: var(--sim-ink);
  white-space: nowrap;
  border: none;
}

/* ── Handbook panel (legacy — kept for JS compatibility) ─────── */
.sim-handbook-panel { display: none !important; }

@media (max-width: 520px) {
  .sim-cover-info { grid-template-columns: repeat(2, 1fr); }
  .sim-q-grid { grid-template-columns: repeat(auto-fill, minmax(46px, 1fr)); }
  .sim-q-cell { width: 46px; }
  .sim-score-preview { grid-template-columns: repeat(2, 1fr); }
}