:root {
  --bg: #eef3f9;
  --card: rgba(255, 255, 255, 0.82);
  --line: rgba(177, 191, 211, 0.72);
  --ink: #20324b;
  --muted: #667a95;
  --blue: #4f83c2;
  --blue-deep: #325985;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(79, 131, 194, 0.12), transparent 32%),
    radial-gradient(circle at bottom right, rgba(50, 89, 133, 0.12), transparent 28%),
    linear-gradient(180deg, #edf3f9 0%, #f7fafd 100%);
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

.landing {
  min-height: 100vh;
  padding: 52px 18px 64px;
}

.hero {
  width: min(760px, 100%);
  margin: 0 auto 42px;
  text-align: center;
}

.hero-logo {
  width: clamp(92px, 14vw, 136px);
  margin: 0 auto 22px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue-deep);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(34px, 6vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.intro {
  max-width: 620px;
  margin: 20px auto 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.85;
}

.portal-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  width: min(1280px, 100%);
  margin: 0 auto;
}

.portal-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--card);
  box-shadow: 0 22px 70px rgba(76, 98, 128, 0.1);
  backdrop-filter: blur(16px);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.portal-card:hover {
  transform: translateY(-4px);
  border-color: rgba(79, 131, 194, 0.8);
  box-shadow: 0 28px 84px rgba(76, 98, 128, 0.16);
}

.portal-card img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: #dfe8f3;
}

.portal-copy {
  padding: 22px 22px 24px;
}

.portal-copy span {
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.portal-copy h2 {
  margin: 10px 0 10px;
  font-size: 24px;
  line-height: 1.2;
}

.portal-copy p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

@media (max-width: 980px) {
  .portal-grid {
    grid-template-columns: 1fr;
    max-width: 680px;
  }
}