:root {
  color-scheme: light;
  --bg: #eef4fb;
  --bg-accent: radial-gradient(circle at top left, rgba(14, 165, 233, 0.16), transparent 24%), radial-gradient(circle at top right, rgba(16, 185, 129, 0.12), transparent 22%), linear-gradient(180deg, #f8fbff 0%, #eef4fb 44%, #e7eef8 100%);
  --panel: rgba(255, 255, 255, 0.9);
  --panel-strong: #ffffff;
  --panel-soft: #f4f8fd;
  --text: #0f1f35;
  --text-soft: #52657f;
  --text-muted: #667a93;
  --primary: #0f6cbd;
  --accent: #0f9d84;
  --border: rgba(15, 31, 53, 0.1);
  --shadow: 0 22px 70px rgba(21, 41, 74, 0.12);
  --shadow-soft: 0 10px 28px rgba(21, 41, 74, 0.08);
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
}

body[data-theme="dark"] {
  color-scheme: dark;
  --bg: #08111d;
  --bg-accent: radial-gradient(circle at top left, rgba(14, 165, 233, 0.2), transparent 24%), radial-gradient(circle at top right, rgba(16, 185, 129, 0.16), transparent 22%), linear-gradient(180deg, #08111d 0%, #091423 44%, #07111f 100%);
  --panel: rgba(12, 21, 36, 0.9);
  --panel-strong: #0d1829;
  --panel-soft: #12233d;
  --text: #ecf3ff;
  --text-soft: #a1b3ca;
  --text-muted: #8fa4bf;
  --primary: #48a8ff;
  --accent: #2dd4bf;
  --border: rgba(148, 163, 184, 0.18);
  --shadow: 0 28px 90px rgba(0, 0, 0, 0.35);
  --shadow-soft: 0 12px 36px rgba(0, 0, 0, 0.22);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", Inter, Arial, sans-serif;
  background: var(--bg-accent);
  color: var(--text);
}

a { color: inherit; text-decoration: none; }
code {
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--panel-soft);
  border: 1px solid var(--border);
}

.shell {
  width: min(1460px, calc(100vw - 28px));
  margin: 14px auto 54px;
}

.hero, .card, .topbar, .module-nav {
  border: 1px solid var(--border);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.hero {
  border-radius: var(--radius-lg);
  padding: 30px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(15, 108, 189, 0.1);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1, h2, h3, h4 { margin: 0; }
h1 {
  margin-top: 16px;
  font-size: clamp(34px, 5vw, 58px);
  line-height: 0.98;
  letter-spacing: -0.05em;
}
h2 {
  font-size: 28px;
  letter-spacing: -0.03em;
}
.lead, .muted, li, p {
  color: var(--text-muted);
  line-height: 1.75;
}

.topbar {
  margin-top: 16px;
  border-radius: var(--radius-md);
  padding: 14px;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
}

.topbar-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.search, .theme-button {
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--panel-strong);
  color: var(--text);
  padding: 12px 14px;
  font-size: 14px;
}

.search {
  min-width: min(420px, calc(100vw - 70px));
}

.theme-button {
  cursor: pointer;
  font-weight: 700;
}

.module-nav {
  margin-top: 18px;
  border-radius: var(--radius-md);
  padding: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nav-link {
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--panel-strong);
  border: 1px solid var(--border);
  color: var(--text-soft);
  font-size: 14px;
}

.nav-link.active,
.nav-link:hover {
  color: var(--text);
  background: rgba(15, 108, 189, 0.12);
}

.grid-3, .grid-2, .module-grid {
  display: grid;
  gap: 18px;
  margin-top: 18px;
}

.grid-3, .module-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.card {
  border-radius: var(--radius-lg);
  padding: 22px;
}

.card h3 {
  font-size: 22px;
  letter-spacing: -0.02em;
}

.card h4 {
  margin-top: 16px;
  margin-bottom: 8px;
  font-size: 14px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--primary);
}

.pill-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 14px;
}

.pill {
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--panel-soft);
  padding: 7px 10px;
  font-size: 13px;
  color: var(--text-soft);
}

.section-title {
  margin-top: 30px;
}

ul, ol {
  margin: 10px 0 0;
  padding-left: 18px;
}

.module-card-link {
  display: inline-flex;
  margin-top: 18px;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  font-weight: 700;
}

.page-header {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: flex-start;
}

.page-header code {
  white-space: nowrap;
}

.empty-state {
  margin-top: 18px;
  padding: 24px;
  border-radius: var(--radius-lg);
  border: 1px dashed var(--border);
  background: var(--panel);
}

@media (max-width: 1120px) {
  .grid-3, .module-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 800px) {
  .grid-2, .grid-3, .module-grid { grid-template-columns: 1fr; }
  .page-header { flex-direction: column; }
  .search { min-width: 100%; }
}