:root {
  color-scheme: light;
  --page: #f4f6fb;
  --surface: #ffffff;
  --surface-soft: #f8f9fc;
  --ink: #172033;
  --muted: #667085;
  --line: #dfe3ec;
  --line-strong: #c8ceda;
  --primary: #3455db;
  --primary-strong: #243fb8;
  --primary-soft: #eef1ff;
  --success: #087a55;
  --success-soft: #e9f7f1;
  --warning: #a15c00;
  --warning-soft: #fff4df;
  --danger: #b42318;
  --danger-soft: #fff0ee;
  --code: #111827;
  --code-ink: #e5e7eb;
  --shadow: 0 18px 55px rgba(26, 35, 64, 0.08);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --content: 1240px;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page: #0f1420;
    --surface: #171e2c;
    --surface-soft: #1d2535;
    --ink: #edf1f7;
    --muted: #aab3c4;
    --line: #30394a;
    --line-strong: #465166;
    --primary: #8da2fb;
    --primary-strong: #b7c4ff;
    --primary-soft: #252f58;
    --success: #70d7b0;
    --success-soft: #123d32;
    --warning: #f5bd68;
    --warning-soft: #3f2d13;
    --danger: #ff9b91;
    --danger-soft: #47201f;
    --code: #0a0e16;
    --code-ink: #e5e7eb;
    --shadow: 0 18px 55px rgba(0, 0, 0, 0.25);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: Pretendard, "Noto Sans KR", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
select,
label,
input[type="radio"],
input[type="checkbox"] {
  cursor: pointer;
}

a {
  color: inherit;
}

.skip-link {
  position: absolute;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 8px;
  background: var(--ink);
  color: var(--surface);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 76px;
  padding: 12px max(24px, calc((100% - var(--content)) / 2));
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(14px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 13px;
  background: var(--ink);
  color: var(--surface);
  font-weight: 800;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  line-height: 1.2;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.73rem;
  letter-spacing: 0.05em;
}

.header-actions,
.question-actions,
.result-heading,
.navigator-heading,
.progress-copy {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.button {
  min-height: 42px;
  padding: 9px 16px;
  border: 1px solid transparent;
  border-radius: 11px;
  font-weight: 700;
  white-space: nowrap;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.button:hover:not(:disabled) {
  transform: translateY(-1px);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.button-primary {
  background: var(--primary);
  color: #ffffff;
}

@media (prefers-color-scheme: dark) {
  .button-primary {
    color: #101526;
  }
}

.button-primary:hover:not(:disabled) {
  background: var(--primary-strong);
}

.button-secondary {
  border-color: var(--line-strong);
  background: var(--surface);
  color: var(--ink);
}

.button-secondary:hover:not(:disabled),
.button-quiet:hover:not(:disabled) {
  background: var(--surface-soft);
}

.button-quiet {
  background: transparent;
  color: var(--muted);
}

.page-shell {
  width: min(calc(100% - 32px), var(--content));
  margin: 0 auto;
  padding: 54px 0 90px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 48px;
  align-items: end;
  margin-bottom: 34px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 8px;
  color: var(--primary);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 820px;
  margin-bottom: 14px;
  font-size: clamp(2rem, 5vw, 4.6rem);
  line-height: 1.08;
  letter-spacing: -0.045em;
}

.hero-copy {
  max-width: 720px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-facts {
  display: flex;
  gap: 26px;
  margin: 0;
}

.hero-facts div {
  min-width: 74px;
}

.hero-facts dt {
  color: var(--muted);
  font-size: 0.78rem;
}

.hero-facts dd {
  margin: 2px 0 0;
  font-size: 1.12rem;
  font-weight: 800;
}

.progress-panel,
.result-panel,
.filter-panel,
.navigator,
.question-panel {
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.progress-panel {
  margin-bottom: 18px;
  padding: 20px 24px;
  border-radius: var(--radius-md);
}

.progress-copy p {
  margin-bottom: 0;
}

.save-status {
  color: var(--muted);
  font-size: 0.85rem;
}

.progress-track {
  height: 9px;
  margin-top: 16px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-soft);
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--primary);
  transition: width 220ms ease;
}

.result-panel {
  margin-bottom: 18px;
  padding: 24px;
  border-radius: var(--radius-lg);
}

.result-heading h2 {
  margin-bottom: 0;
  font-size: 1.55rem;
}

.score-grid {
  display: grid;
  grid-template-columns: 1.3fr repeat(3, 1fr);
  gap: 12px;
  margin-top: 20px;
}

.score-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-soft);
}

.score-card-main {
  border-color: color-mix(in srgb, var(--primary) 35%, var(--line));
  background: var(--primary-soft);
}

.score-card > span {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 0.82rem;
}

.score-card strong {
  font-size: 1.75rem;
  line-height: 1.15;
}

.score-card small {
  color: var(--muted);
  font-size: 0.8rem;
}

.section-results {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px 20px;
  margin-top: 24px;
}

.section-result-row {
  min-width: 0;
}

.section-result-copy {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
  font-size: 0.84rem;
}

.section-result-copy span:first-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.mini-track {
  height: 6px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--line);
}

.mini-track span {
  display: block;
  height: 100%;
  background: var(--primary);
}

.result-note {
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.filter-panel {
  display: grid;
  grid-template-columns: repeat(3, minmax(150px, 1fr)) auto;
  gap: 12px;
  align-items: end;
  margin-bottom: 18px;
  padding: 18px;
  border-radius: var(--radius-md);
}

.filter-panel label > span {
  display: block;
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

select,
textarea,
input[type="text"] {
  width: 100%;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink);
}

select,
input[type="text"] {
  min-height: 44px;
  padding: 8px 36px 8px 12px;
}

textarea {
  min-height: 260px;
  padding: 14px;
  resize: vertical;
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 0.9rem;
  line-height: 1.6;
}

.exam-layout {
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.navigator {
  position: sticky;
  top: 18px;
  padding: 20px;
  border-radius: var(--radius-lg);
}

.navigator-heading h2 {
  margin-bottom: 0;
  font-size: 1.05rem;
}

.navigator-heading span {
  color: var(--muted);
  font-size: 0.75rem;
}

.navigator-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 12px 0 16px;
  color: var(--muted);
  font-size: 0.73rem;
}

.navigator-legend span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--line-strong);
}

.legend-dot.answered {
  background: var(--success);
}

.legend-dot.flagged {
  background: var(--warning);
}

.legend-dot.wrong {
  background: var(--danger);
}

.question-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 7px;
}

.question-number {
  display: grid;
  min-width: 0;
  aspect-ratio: 1;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.question-number:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.question-number.is-answered {
  border-color: color-mix(in srgb, var(--success) 42%, var(--line));
  background: var(--success-soft);
  color: var(--success);
}

.question-number.is-flagged {
  box-shadow: inset 0 -4px 0 var(--warning);
}

.question-number.is-wrong {
  border-color: color-mix(in srgb, var(--danger) 50%, var(--line));
  background: var(--danger-soft);
  color: var(--danger);
}

.question-number.is-current {
  outline: 3px solid color-mix(in srgb, var(--primary) 28%, transparent);
  border-color: var(--primary);
  color: var(--primary);
}

.question-panel {
  min-height: 640px;
  padding: clamp(24px, 4vw, 44px);
  border-radius: var(--radius-lg);
}

.question-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.meta-chip {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 0.73rem;
  font-weight: 700;
}

.meta-chip-primary {
  background: var(--primary-soft);
  color: var(--primary);
}

.question-title {
  margin-bottom: 22px;
  font-size: clamp(1.25rem, 2.5vw, 1.7rem);
  line-height: 1.45;
  letter-spacing: -0.02em;
}

.question-context {
  margin-bottom: 20px;
  padding: 16px 18px;
  border-left: 4px solid var(--primary);
  border-radius: 0 12px 12px 0;
  background: var(--primary-soft);
  white-space: pre-wrap;
}

pre {
  max-width: 100%;
  margin: 18px 0;
  padding: 18px;
  overflow-x: auto;
  border-radius: 13px;
  background: var(--code);
  color: var(--code-ink);
  font-family: "Cascadia Code", Consolas, monospace;
  font-size: 0.86rem;
  line-height: 1.65;
  white-space: pre;
}

.answer-form {
  margin: 0;
  padding: 0;
  border: 0;
}

.answer-form legend,
.answer-label {
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.choice-list {
  display: grid;
  gap: 10px;
}

.choice {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 11px;
  align-items: start;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--surface-soft);
  transition: border-color 150ms ease, background-color 150ms ease;
}

.choice:hover {
  border-color: var(--line-strong);
}

.choice:has(input:checked) {
  border-color: var(--primary);
  background: var(--primary-soft);
}

.choice:has(input:disabled) {
  cursor: default;
}

.choice.is-correct {
  border-color: var(--success);
  background: var(--success-soft);
}

.choice.is-wrong {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.choice-index {
  display: grid;
  width: 26px;
  height: 26px;
  place-items: center;
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 800;
}

.choice input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  opacity: 0;
}

.choice input:focus-visible + .choice-index {
  outline: 3px solid color-mix(in srgb, var(--primary) 35%, transparent);
}

.short-answer-wrap {
  max-width: 620px;
}

.short-answer-hint {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.78rem;
}

.practical-instructions {
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 0.9rem;
}

.feedback {
  margin-top: 26px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-soft);
}

.feedback.correct {
  border-color: color-mix(in srgb, var(--success) 45%, var(--line));
  background: var(--success-soft);
}

.feedback.incorrect {
  border-color: color-mix(in srgb, var(--danger) 45%, var(--line));
  background: var(--danger-soft);
}

.feedback h3 {
  margin-bottom: 10px;
  font-size: 1rem;
}

.feedback p:last-child {
  margin-bottom: 0;
}

.correct-answer {
  font-weight: 800;
}

.reference-link {
  display: inline-flex;
  margin-top: 10px;
  color: var(--primary);
  font-size: 0.84rem;
  font-weight: 700;
  text-underline-offset: 3px;
}

.rubric {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.rubric h3 {
  margin-bottom: 6px;
}

.rubric > p {
  color: var(--muted);
  font-size: 0.84rem;
}

.rubric-list {
  display: grid;
  gap: 9px;
  margin-top: 12px;
}

.rubric-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px 12px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--surface) 65%, transparent);
}

.rubric-item input {
  width: 18px;
  height: 18px;
  margin-top: 3px;
  accent-color: var(--primary);
}

.model-answer {
  margin-top: 18px;
}

.model-answer summary {
  cursor: pointer;
  color: var(--primary);
  font-weight: 800;
}

.question-actions {
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.flag-control {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 700;
}

.flag-control input {
  width: 18px;
  height: 18px;
  accent-color: var(--warning);
}

.empty-state {
  display: grid;
  min-height: 420px;
  place-items: center;
  text-align: center;
}

.empty-state h2 {
  margin-bottom: 6px;
}

.empty-state p {
  color: var(--muted);
}

.noscript-message {
  padding: 18px;
  border-radius: var(--radius-md);
  background: var(--danger-soft);
  color: var(--danger);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 30px max(24px, calc((100% - var(--content)) / 2));
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer p {
  margin-bottom: 0;
}

.site-footer a {
  color: var(--primary);
  font-weight: 700;
}

@media (max-width: 920px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .hero-facts {
    justify-content: flex-start;
  }

  .score-grid,
  .section-results {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .filter-panel {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .exam-layout {
    grid-template-columns: 1fr;
  }

  .navigator {
    position: static;
  }

  .question-grid {
    grid-template-columns: repeat(10, minmax(32px, 1fr));
  }
}

@media (max-width: 640px) {
  .site-header {
    align-items: flex-start;
    gap: 8px;
    padding: 12px 16px;
  }

  .brand small {
    display: none;
  }

  .header-actions {
    gap: 6px;
  }

  .header-actions .button {
    padding-inline: 10px;
    font-size: 0.8rem;
  }

  .page-shell {
    width: min(calc(100% - 20px), var(--content));
    padding-top: 34px;
  }

  h1 {
    font-size: clamp(2rem, 11vw, 3.2rem);
  }

  .hero-facts {
    gap: 16px;
  }

  .progress-panel,
  .result-panel,
  .filter-panel,
  .navigator,
  .question-panel {
    box-shadow: none;
  }

  .score-grid,
  .section-results,
  .filter-panel {
    grid-template-columns: 1fr;
  }

  .result-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .question-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .question-panel {
    min-height: 560px;
    padding: 22px 18px;
  }

  .question-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .flag-control {
    grid-column: 1 / -1;
    grid-row: 1;
    justify-self: center;
  }

  .site-footer {
    flex-direction: column;
    padding: 24px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}