:root {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #172233;
  background: #f4f6f9;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(178, 138, 61, .09), transparent 28%),
    linear-gradient(180deg, #eef2f7 0%, #f8fafc 100%);
}

button, input { font: inherit; }
button { cursor: pointer; }

.container {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  background: #101c2d;
  color: white;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

.header-inner {
  min-height: 84px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(224, 190, 120, .55);
  border-radius: 12px;
  color: #f1d59b;
  font-weight: 900;
  letter-spacing: .04em;
  background: rgba(255,255,255,.04);
}

.brand-name {
  margin: 0;
  font-size: .98rem;
  font-weight: 900;
  letter-spacing: .16em;
}

.brand-subtitle {
  margin: 3px 0 0;
  color: #b9c3d0;
  font-size: .86rem;
}

.eyebrow,
.section-kicker {
  margin: 0;
  font-size: .76rem;
  font-weight: 850;
  letter-spacing: .13em;
  text-transform: uppercase;
  color: #956915;
}

main { padding: 48px 0 72px; }

.view { display: none; }
.view.active { display: block; }

.hero-shell {
  max-width: 980px;
  margin: 0 auto;
}

.hero-card,
.question-card,
.navigator-card,
.result-card {
  background: rgba(255,255,255,.97);
  border: 1px solid #dfe5ec;
  border-radius: 20px;
  box-shadow: 0 18px 50px rgba(25, 40, 60, .08);
}

.hero-card,
.result-card {
  padding: clamp(28px, 5vw, 58px);
}

.hero-card h1 {
  margin: 10px 0 14px;
  max-width: 680px;
  font-size: clamp(1.85rem, 3.6vw, 3rem);
  line-height: 1.08;
  letter-spacing: -.035em;
}

.result-card h2 {
  margin: 10px 0 8px;
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.lead,
.result-intro {
  margin: 0;
  max-width: 760px;
  color: #58667a;
  line-height: 1.75;
  font-size: 1.04rem;
}

.mode-section {
  margin-top: 42px;
  padding-top: 30px;
  border-top: 1px solid #e2e7ee;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
}

.section-heading h2 {
  margin: 5px 0 0;
  font-size: 1.5rem;
}

.section-heading > p {
  margin: 0;
  color: #748094;
  font-size: .9rem;
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin: 20px 0 30px;
}

.mode-card {
  min-height: 190px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  border: 1px solid #cfd8e3;
  border-radius: 16px;
  padding: 24px;
  background: #fff;
  text-align: left;
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}

.mode-card.featured {
  border-color: #c6a767;
  background: linear-gradient(180deg, #fffdf7 0%, #fff 100%);
}

.mode-card:hover,
.mode-card:focus-visible {
  transform: translateY(-3px);
  border-color: #9a6d17;
  box-shadow: 0 14px 32px rgba(75, 55, 20, .11);
  outline: none;
}

.mode-card:disabled {
  opacity: .6;
  cursor: wait;
  transform: none;
}

.mode-badge {
  display: inline-flex;
  padding: 5px 9px;
  border-radius: 999px;
  background: #f5eddc;
  color: #7b5917;
  font-size: .75rem;
  font-weight: 800;
}

.mode-card strong {
  margin-top: 18px;
  font-size: 1.65rem;
  letter-spacing: -.02em;
}

.mode-detail {
  margin-top: 6px;
  color: #687589;
}

.mode-action {
  margin-top: auto;
  padding-top: 22px;
  color: #173f70;
  font-weight: 800;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 22px;
}

.feature-item {
  padding: 18px;
  border-radius: 14px;
  background: #f7f9fb;
  border: 1px solid #e4e9ef;
}

.feature-item strong,
.feature-item span { display: block; }
.feature-item strong { margin-bottom: 7px; font-size: .95rem; }
.feature-item span { color: #687589; line-height: 1.55; font-size: .88rem; }

.notice {
  padding: 16px 18px;
  border-left: 4px solid #b28a3d;
  background: #fff8e9;
  color: #58451f;
  line-height: 1.55;
  border-radius: 0 10px 10px 0;
}

.exam-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  gap: 16px;
}

.exam-toolbar h2 { margin: 6px 0 2px; }
.answer-progress { margin: 0; color: #718096; font-size: .9rem; }

.timer {
  min-width: 118px;
  padding: 12px 18px;
  border-radius: 12px;
  background: #101c2d;
  color: white;
  font-weight: 850;
  font-size: 1.35rem;
  text-align: center;
  font-variant-numeric: tabular-nums;
  box-shadow: 0 8px 22px rgba(16, 28, 45, .12);
}

.timer.warning { background: #9b2c2c; }

.exam-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 292px;
  gap: 22px;
  align-items: start;
}

.question-card { padding: clamp(24px, 4vw, 42px); }
.question-text {
  margin: 0 0 28px;
  font-size: 1.2rem;
  line-height: 1.72;
  font-weight: 750;
}

.choice-list { display: grid; gap: 12px; }

.choice-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  border: 1px solid #d7dee8;
  border-radius: 13px;
  padding: 16px;
  background: #fff;
  transition: border-color .16s ease, background .16s ease, transform .16s ease;
}

.choice-option:hover { border-color: #9aa9bc; transform: translateY(-1px); }
.choice-option.selected {
  border-color: #2e5f9e;
  background: #edf5ff;
}
.choice-option input { margin-top: 3px; }
.choice-label { font-weight: 850; min-width: 24px; }
.choice-text { line-height: 1.55; }

.question-actions {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.primary-button,
.secondary-button,
.danger-button,
.text-button {
  border-radius: 10px;
  padding: 11px 16px;
  font-weight: 780;
}

.primary-button {
  border: 1px solid #1e4f8a;
  background: #1e4f8a;
  color: white;
}
.primary-button:hover { background: #173f70; }

.secondary-button {
  border: 1px solid #cad3df;
  background: white;
  color: #27364a;
}
.secondary-button.active {
  background: #fff4d8;
  border-color: #b28a3d;
}
.secondary-button:disabled { opacity: .45; cursor: not-allowed; }

.danger-button {
  width: 100%;
  margin-top: 18px;
  border: 1px solid #9d3232;
  background: #9d3232;
  color: white;
}

.text-button {
  border: 1px solid rgba(255,255,255,.25);
  background: transparent;
  color: white;
}

.navigator-card { padding: 22px; position: sticky; top: 20px; }
.navigator-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.navigator-heading h3 { margin: 0; }
.navigator-heading span { color: #7b8798; font-size: .82rem; }

.navigator-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin: 14px 0 16px;
  color: #69768a;
  font-size: .75rem;
}
.navigator-legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend-dot { width: 9px; height: 9px; border-radius: 3px; display: inline-block; }
.answered-dot { background: #d9efdf; border: 1px solid #56a271; }
.flagged-dot { background: #fff4d8; border: 1px solid #c38b22; }

.question-navigator {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}

.nav-question {
  aspect-ratio: 1;
  border: 1px solid #ced6e1;
  background: white;
  border-radius: 8px;
  font-weight: 700;
}
.nav-question.answered { background: #e7f5ec; border-color: #56a271; }
.nav-question.flagged { box-shadow: inset 0 0 0 2px #c38b22; }
.nav-question.current { background: #1e4f8a; border-color: #1e4f8a; color: white; }

.result-summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin: 28px 0;
}

.summary-item {
  padding: 18px;
  border-radius: 12px;
  background: #f4f7fa;
  border: 1px solid #e0e6ed;
}
.summary-item strong { display: block; font-size: 1.65rem; }
.summary-item span { color: #637083; }

.result-details { display: grid; gap: 12px; margin-bottom: 28px; }
.result-row {
  padding: 17px;
  border: 1px solid #dfe5ec;
  border-radius: 12px;
  background: #fff;
}
.result-row.correct { border-left: 5px solid #3b8c5a; }
.result-row.incorrect { border-left: 5px solid #b13b3b; }
.result-row.unanswered { border-left: 5px solid #9aa3af; }
.result-row h4 { margin: 0 0 8px; line-height: 1.55; }
.result-row p { margin: 5px 0; line-height: 1.5; }

.site-footer {
  border-top: 1px solid #dbe2ea;
  padding: 22px 0;
  color: #677487;
  background: #fff;
}
.footer-inner { display: flex; justify-content: space-between; gap: 16px; font-size: .86rem; }

@media (max-width: 820px) {
  .feature-grid { grid-template-columns: 1fr; }
  .exam-layout { grid-template-columns: 1fr; }
  .navigator-card { position: static; }
  .result-summary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .container { width: min(100% - 20px, 1160px); }
  .header-inner { min-height: 76px; }
  .brand-subtitle { display: none; }
  .brand-mark { width: 38px; height: 38px; }
  .text-button { padding: 9px 11px; }
  .mode-grid { grid-template-columns: 1fr; }
  .section-heading { align-items: start; flex-direction: column; gap: 6px; }
  main { padding-top: 26px; }
  .hero-card h1 { font-size: clamp(1.75rem, 8vw, 2.45rem); }
  .exam-toolbar { align-items: flex-end; }
  .timer { min-width: 96px; font-size: 1.05rem; }
  .question-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .question-actions .primary-button { grid-column: 1 / -1; }
  .result-summary { grid-template-columns: 1fr 1fr; }
  .footer-inner { flex-direction: column; gap: 4px; }
}