:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --ink: #1c2430;
  --muted: #5b6675;
  --line: #e2e7ee;
  --brand: #0a4d8c;
  --brand-d: #073a6b;
  --warn: #b9760a;
  --warn-bg: #fcf3e2;
  --warn-line: #f0dcb0;
  --shadow: 0 1px 3px rgba(20, 40, 70, .08), 0 6px 20px rgba(20, 40, 70, .06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  font-size: 15px;
}

.wrap {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 18px 80px;
}

/* Top nav */
header.site {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(244, 246, 249, .92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
  margin-right: auto;
}

.brand .logo {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--brand), var(--brand-d));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  flex: 0 0 auto;
}

.brand span {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -.2px;
}

nav.links {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

nav.links a {
  text-decoration: none;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 8px;
  transition: .15s;
}

nav.links a:hover {
  background: #fff;
  color: var(--ink);
}

nav.links a.active {
  background: var(--brand);
  color: #fff;
}

/* Page header */
main .intro {
  padding: 32px 0 8px;
}

main .intro h1 {
  font-size: 24px;
  margin: 0 0 6px;
  letter-spacing: -.3px;
}

main .intro p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
  max-width: 640px;
}

/* Cards */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin: 20px 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
  display: block;
  transition: .15s;
}

a.card:hover {
  border-color: var(--brand);
  transform: translateY(-1px);
}

.card h2 {
  font-size: 16px;
  margin: 0 0 6px;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 13.5px;
}

/* Sub-tabs */
.tabs {
  display: flex;
  gap: 8px;
  margin: 20px 0 4px;
  flex-wrap: wrap;
}

.tab {
  flex: 1;
  min-width: 140px;
  padding: 12px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  text-align: center;
  transition: .15s;
}

.tab.active {
  background: var(--brand);
  color: #fff;
  border-color: var(--brand);
}

.tab:hover:not(.active) {
  border-color: var(--brand);
}

/* Notice */
.notice {
  background: var(--warn-bg);
  border: 1px solid var(--warn-line);
  border-radius: 12px;
  padding: 16px 18px;
  margin: 20px 0;
  font-size: 13.5px;
  color: var(--ink);
  line-height: 1.55;
}

.notice strong {
  color: var(--warn);
}

.notice a {
  color: var(--warn);
  font-weight: 600;
}

/* Empty state */
.empty {
  border: 2px dashed var(--line);
  border-radius: 14px;
  padding: 40px 18px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  margin: 20px 0;
}