:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-soft: #eef4ff;
  --text: #172033;
  --muted: #5d6880;
  --line: #d9e1ef;
  --primary: #1d4ed8;
  --primary-dark: #173ea9;
  --accent: #0f766e;
  --shadow: 0 18px 45px rgba(23, 32, 51, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 3px solid #f59e0b;
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  top: 0;
  left: 50%;
  z-index: 100;
  transform: translate(-50%, -120%);
  padding: 0.75rem 1rem;
  border-radius: 0 0 14px 14px;
  color: white;
  background: var(--primary);
  font-weight: 800;
  text-decoration: none;
  box-shadow: var(--shadow);
}

.skip-link:focus {
  transform: translate(-50%, 0);
}

.container {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 1rem;
}

.brand {
  font-weight: 800;
  font-size: 1.25rem;
  text-decoration: none;
  letter-spacing: -0.03em;
}

.nav-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.nav-links a {
  color: var(--muted);
  font-weight: 600;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--primary);
}

.hero {
  padding: 5rem 0 4rem;
  background:
    radial-gradient(circle at top left, rgba(29, 78, 216, 0.16), transparent 34rem),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.7fr);
  gap: 2rem;
  align-items: center;
}

.hero h1,
.section-heading h1,
.section-heading h2,
.doc-page h1 {
  margin: 0;
  line-height: 1.08;
  letter-spacing: -0.05em;
}

.hero h1 {
  max-width: 760px;
  font-size: clamp(2.5rem, 7vw, 5rem);
}

.lead {
  max-width: 720px;
  margin: 1.5rem 0 0;
  color: var(--muted);
  font-size: 1.2rem;
}

.lead.compact {
  max-width: 820px;
}

.eyebrow {
  margin: 0 0 0.75rem;
  color: var(--accent);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  font-size: 0.78rem;
}

.actions {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.7rem 1rem;
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
  border: 1px solid transparent;
}

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

.button.primary:hover {
  background: var(--primary-dark);
}

.button.secondary {
  color: var(--primary);
  background: white;
  border-color: var(--line);
}

.hero-card,
.card,
.notice,
.question-card,
.filters,
.doc-page {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 1.5rem;
}

.hero-card h2 {
  margin-top: 0;
}

.section {
  padding: 4rem 0;
}

.section-heading {
  margin-bottom: 1.5rem;
}

.section-heading.narrow {
  max-width: 760px;
}

.section-heading h1,
.section-heading h2,
.doc-page h1 {
  font-size: clamp(2rem, 4vw, 3.4rem);
}

.section-heading p,
.split p {
  color: var(--muted);
  font-size: 1.06rem;
}

.cards {
  display: grid;
  gap: 1rem;
}

.three-columns {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  padding: 1.4rem;
}

.card h3 {
  margin-top: 0;
}

.card p {
  margin-bottom: 0;
  color: var(--muted);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: 1.5rem;
  align-items: center;
}

.notice {
  padding: 1.25rem;
  background: var(--surface-soft);
}

.filters {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 1rem;
  padding: 1rem;
  margin: 1.5rem 0;
}

.filters label {
  display: grid;
  gap: 0.35rem;
  color: var(--muted);
  font-weight: 700;
}

input,
select {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.65rem 0.75rem;
  color: var(--text);
  background: white;
  font: inherit;
}

.catalog-status {
  color: var(--muted);
  font-weight: 700;
}

.question-list {
  display: grid;
  gap: 1rem;
}

.question-card {
  padding: 1.25rem;
}

.question-header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
}

.question-card h2 {
  margin: 0.15rem 0 0;
  font-size: 1.35rem;
}

.question-id,
.question-meta {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.badge,
.tag {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.24rem 0.65rem;
  font-size: 0.78rem;
  font-weight: 800;
}

.badge {
  color: #075985;
  background: #e0f2fe;
}

.tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin: 0.9rem 0;
}

.tag {
  color: #334155;
  background: #f1f5f9;
}

details {
  margin-top: 0.75rem;
  border-top: 1px solid var(--line);
  padding-top: 0.75rem;
}

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

.question-body,
.solution-body {
  margin-top: 0.85rem;
  color: var(--text);
}

.question-body ol {
  padding-left: 1.4rem;
}

.moodle-preview {
  margin-top: 0.85rem;
}

.moodle-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #f8fafc;
}

.moodle-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--line);
  background: #eef4ff;
}

.moodle-pill {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  color: #1e3a8a;
  background: #dbeafe;
  font-size: 0.78rem;
  font-weight: 800;
}

.moodle-context,
.moodle-note,
.moodle-label {
  color: var(--muted);
  font-size: 0.9rem;
}

.moodle-question {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 0.9rem;
  padding: 1rem;
  background: white;
}

.moodle-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  color: white;
  background: var(--primary);
  font-weight: 900;
}

.moodle-content {
  min-width: 0;
}

.moodle-label {
  margin: 0 0 0.35rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.moodle-statement ol {
  display: grid;
  gap: 0.5rem;
  padding-left: 1.35rem;
}

.moodle-statement li {
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f8fafc;
}

.moodle-feedback {
  margin: 1rem;
  padding: 0.85rem 1rem;
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  background: #ecfdf5;
}

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

.moodle-note {
  margin: 0;
  padding: 0 1rem 1rem;
}

.doc-page {
  padding: clamp(1.5rem, 4vw, 3rem);
}

.doc-page section {
  margin-top: 2rem;
}

.doc-page h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.45rem, 3vw, 2rem);
}

.doc-page p,
.doc-page li {
  color: var(--muted);
  font-size: 1.03rem;
}

.doc-page ul {
  padding-left: 1.25rem;
}

code {
  padding: 0.1rem 0.3rem;
  border-radius: 0.4rem;
  background: #f1f5f9;
  color: #334155;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0;
  color: var(--muted);
  background: white;
}

@media (max-width: 800px) {
  .hero-grid,
  .three-columns,
  .split,
  .filters,
  .moodle-question {
    grid-template-columns: 1fr;
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 1rem 0;
  }

  .nav-links {
    gap: 0.35rem 0.85rem;
  }

  .hero {
    padding: 3rem 0 2.5rem;
  }

  .section {
    padding: 2.5rem 0;
  }

  .question-header {
    flex-direction: column;
  }

  .actions .button {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .container {
    width: min(1120px, calc(100% - 1rem));
  }

  .hero h1,
  .section-heading h1,
  .section-heading h2,
  .doc-page h1 {
    letter-spacing: -0.035em;
  }

  .hero-card,
  .card,
  .notice,
  .question-card,
  .filters,
  .doc-page {
    border-radius: 18px;
  }

  .question-card,
  .doc-page,
  .filters {
    padding: 1rem;
  }
}