:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-soft: #eef3f7;
  --text: #20242a;
  --muted: #69717d;
  --line: #d9dee7;
  --primary: #1f6feb;
  --primary-dark: #174ea6;
  --accent: #0f9f8f;
  --shadow: 0 18px 42px rgba(27, 39, 61, 0.12);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(15, 159, 143, 0.14), transparent 34%),
    radial-gradient(circle at right 18% top 16%, rgba(31, 111, 235, 0.14), transparent 30%),
    var(--bg);
  color: var(--text);
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

.portal-shell {
  min-height: 100vh;
  max-width: 1120px;
  margin: 0 auto;
  padding: 48px 24px;
  display: grid;
  align-content: center;
  gap: 26px;
}

.portal-hero {
  display: grid;
  gap: 14px;
}

.portal-kicker,
.portal-card-label {
  margin: 0;
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 700;
}

.portal-hero h1,
.portal-hero p,
.portal-card h2,
.portal-card p {
  margin: 0;
}

.portal-hero h1 {
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.02;
}

.portal-summary {
  max-width: 780px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.55;
}

.portal-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.portal-card {
  min-height: 260px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow);
  transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.portal-card:hover {
  transform: translateY(-2px);
  border-color: rgba(31, 111, 235, 0.28);
  box-shadow: 0 22px 50px rgba(27, 39, 61, 0.16);
}

.portal-card-copy {
  display: grid;
  gap: 12px;
}

.portal-card h2 {
  font-size: 28px;
  line-height: 1.08;
}

.portal-card-title-cn {
  font-size: 36px !important;
  line-height: 1.02 !important;
}

.portal-card-title-en {
  color: var(--muted);
  font-size: 15px !important;
  line-height: 1.3 !important;
  font-weight: 700;
}

.portal-card p {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.55;
}

.portal-card-internal {
  background:
    linear-gradient(135deg, rgba(31, 111, 235, 0.06), transparent 46%),
    rgba(255, 255, 255, 0.94);
}

.portal-card-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  width: fit-content;
  padding: 0 16px;
  border-radius: var(--radius);
  background: #e7eefb;
  color: var(--primary-dark);
  font-size: 14px;
  font-weight: 700;
}

@media (max-width: 760px) {
  .portal-shell {
    padding: 28px 14px;
  }

  .portal-grid {
    grid-template-columns: 1fr;
  }

  .portal-card {
    min-height: 220px;
  }
}