/* 外门户统一视觉：柔和、少发光、不刺眼 */
:root {
  --primary: #1d4ed8;
  --primary-dark: #1e40af;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --bg: #e9ecef;
  --white: #f8f9fa;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .05);
  --shadow-sm: none;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body.portal-body {
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }

.portal-shell {
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 0 48px 80px;
}
.portal-shell.narrow { max-width: 1100px; }
.portal-shell.article { max-width: 1000px; }

.portal-hero {
  position: relative;
  overflow: hidden;
  margin: 0 0 20px;
  padding: 18px 0 16px;
  background: transparent;
  border-bottom: 1px solid #dee2e6;
}
.portal-hero-inner {
  max-width: none;
  margin: 0;
  display: block;
}
.portal-hero h1 {
  font-size: 22px;
  letter-spacing: -.01em;
  font-weight: 800;
  margin-bottom: 4px;
  line-height: 1.3;
  color: #212529;
}
.portal-hero p,
.portal-hero .lead {
  color: var(--muted);
  font-size: 13.5px;
  max-width: 720px;
  line-height: 1.6;
  margin: 0;
}
.portal-hero-art { display: none !important; }

.portal-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 15px;
  border: 1px solid transparent;
  transition: .15s;
  cursor: pointer;
  min-height: 44px;
  box-shadow: none;
}
.portal-btn-primary {
  background: var(--primary);
  color: #fff !important;
}
.portal-btn-primary:hover { background: var(--primary-dark); }
.portal-btn-outline {
  background: #fff;
  border-color: var(--border);
  color: var(--text) !important;
}
.portal-btn-outline:hover { border-color: var(--primary); color: var(--primary) !important; }
.portal-btn-qq {
  background: #0ea5e9;
  color: #fff !important;
}
.portal-btn-qq:hover { background: #0284c7; }

.portal-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.portal-footer {
  background: #0f172a;
  color: rgba(255,255,255,.7);
  padding: 28px 24px;
  text-align: center;
  font-size: 0.9rem;
  margin-top: 24px;
}
.portal-footer a {
  color: rgba(255,255,255,.82);
  margin: 0 10px;
}
.portal-footer a:hover { color: #fff; }

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .55s ease, transform .55s ease;
}
.reveal.in {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: .06s; }
.reveal-delay-2 { transition-delay: .12s; }
.reveal-delay-3 { transition-delay: .18s; }
.reveal-delay-4 { transition-delay: .24s; }
.reveal-delay-5 { transition-delay: .3s; }
.portal-hero .reveal-hero {
  opacity: 0;
  animation: portalHeroIn .55s ease forwards;
}
.portal-hero .reveal-hero-art {
  opacity: 0;
  animation: portalHeroIn .6s .08s ease forwards;
}
@keyframes portalHeroIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .reveal, .portal-hero .reveal-hero, .portal-hero .reveal-hero-art {
    opacity: 1 !important;
    transform: none !important;
    animation: none !important;
    transition: none !important;
  }
}

@media (max-width: 960px) {
  .portal-shell { padding: 0 16px 64px; }
  .portal-hero { margin: 0 0 16px; padding: 14px 0 12px; }
  .portal-hero h1 { font-size: 20px; }
}