:root {
  color-scheme: light;
  --navy: #07345a;
  --ink: #173b58;
  --muted: #617589;
  --blue: #087ff0;
  --cyan: #39c6df;
  --line: rgba(42, 105, 145, 0.16);
  --card: rgba(255, 255, 255, 0.88);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.75;
  background:
    radial-gradient(circle at 10% 8%, rgba(76, 213, 238, 0.28), transparent 32rem),
    radial-gradient(circle at 92% 24%, rgba(8, 127, 240, 0.18), transparent 30rem),
    linear-gradient(180deg, #d7f4fc 0%, #f4fbfd 42%, #e4f2f8 100%);
}

a { color: #0e6fc4; text-underline-offset: 3px; }

.shell { width: min(920px, calc(100% - 32px)); margin: 0 auto; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 22px 0 10px;
}

.brand { display: flex; align-items: center; gap: 13px; text-decoration: none; }
.brand img { width: 52px; height: 52px; border-radius: 15px; box-shadow: 0 8px 24px rgba(8, 75, 125, 0.16); }
.brand strong { display: block; color: var(--navy); font-size: 20px; letter-spacing: 0.03em; }
.brand span { display: block; color: var(--muted); font-size: 12px; }

nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px 16px; }
nav a { color: #315773; text-decoration: none; font-size: 14px; }
nav a:hover { color: var(--blue); }

.hero {
  position: relative;
  overflow: hidden;
  margin: 22px 0 18px;
  padding: 42px;
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 28px;
  color: white;
  background: linear-gradient(135deg, #075996 0%, #087ff0 58%, #20b8cf 100%);
  box-shadow: 0 20px 50px rgba(8, 82, 139, 0.18);
}

.hero::after {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -120px;
  width: 360px;
  height: 260px;
  border: 24px solid rgba(255, 255, 255, 0.13);
  border-radius: 50%;
  transform: rotate(-12deg);
}

.hero h1 { position: relative; z-index: 1; margin: 0 0 10px; font-size: clamp(32px, 6vw, 50px); line-height: 1.15; }
.hero p { position: relative; z-index: 1; max-width: 620px; margin: 0; color: rgba(255, 255, 255, 0.9); font-size: 17px; }
.badge { display: inline-block; position: relative; z-index: 1; margin-top: 20px; padding: 6px 12px; border: 1px solid rgba(255, 255, 255, 0.42); border-radius: 999px; font-size: 13px; }

.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--card);
  box-shadow: 0 10px 30px rgba(23, 79, 112, 0.06);
  backdrop-filter: blur(10px);
}
.card.wide { grid-column: 1 / -1; }
.card h1, .card h2, .card h3 { color: var(--navy); }
.card h1 { margin: 0 0 6px; font-size: 28px; }
.card h2 { margin: 0 0 10px; font-size: 20px; }
.card h3 { margin: 24px 0 8px; font-size: 17px; }
.card p { margin: 8px 0; }
.card ol, .card ul { padding-left: 1.35em; }
.card li + li { margin-top: 7px; }
.muted { color: var(--muted); }
.date { margin: 0 0 18px; color: var(--muted); font-size: 13px; }

.link-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.link-list a {
  display: block;
  padding: 14px 15px;
  border: 1px solid rgba(8, 127, 240, 0.13);
  border-radius: 13px;
  color: #0b68b5;
  background: #edf7ff;
  text-decoration: none;
  font-weight: 600;
}

.notice { padding: 13px 15px; border-left: 4px solid var(--cyan); border-radius: 9px; background: #eefafd; color: #385b70; }

footer { padding: 24px 0 42px; text-align: center; color: var(--muted); font-size: 13px; }
footer div + div { margin-top: 3px; }

@media (max-width: 680px) {
  .topbar { align-items: flex-start; }
  nav { max-width: 160px; }
  .hero { padding: 30px 22px; border-radius: 22px; }
  .grid { grid-template-columns: 1fr; }
  .card.wide { grid-column: auto; }
  .link-list { grid-template-columns: 1fr; }
}