:root {
  --bg: #f5f8fd;
  --bg-soft: #ffffff;
  --panel: rgba(255, 255, 255, 0.94);
  --panel-strong: rgba(248, 251, 255, 0.98);
  --text: #17324f;
  --muted: rgba(23, 50, 79, 0.68);
  --line: rgba(66, 114, 171, 0.18);
  --accent: #1d63d8;
  --accent-2: #0aa0c7;
  --accent-3: #5aa9ff;
  --shadow: 0 18px 40px rgba(56, 89, 140, 0.12);
  --max: 1200px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(29, 99, 216, 0.1), transparent 32%),
    radial-gradient(circle at 80% 10%, rgba(10, 160, 199, 0.1), transparent 28%),
    radial-gradient(circle at bottom right, rgba(90, 169, 255, 0.08), transparent 30%),
    linear-gradient(180deg, #f8fbff 0%, #eef5ff 55%, #f4f8fd 100%);
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(29, 99, 216, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29, 99, 216, 0.035) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(180deg, rgba(23, 50, 79, 0.55), transparent 92%);
  opacity: 0.42;
}

.page-shell {
  position: relative;
  width: min(calc(100% - 32px), var(--max));
  margin: 0 auto;
  padding: 18px 0 40px;
}

.site-header {
  position: sticky;
  top: 18px;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--text);
  text-decoration: none;
}
.brand-logo {
  width: 58px;
  height: 58px;
  object-fit: contain;
  flex: 0 0 auto;
  filter: drop-shadow(0 10px 20px rgba(56, 89, 140, 0.16));
}
.brand-copy { display: flex; flex-direction: column; line-height: 1.12; }
.brand-copy strong { font-size: 16px; letter-spacing: 0.04em; }
.brand-copy small { color: var(--muted); margin-top: 4px; font-size: 12px; }
.site-nav { display: flex; align-items: center; gap: 18px; }
.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  transition: color 180ms ease, transform 180ms ease;
}
.site-nav a:hover { color: var(--text); transform: translateY(-1px); }
.nav-cta {
  padding: 11px 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(29, 99, 216, 0.12), rgba(10, 160, 199, 0.1));
  border: 1px solid rgba(29, 99, 216, 0.16);
}
.nav-toggle {
  display: none;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.88);
  color: var(--text);
}
.nav-toggle span { display: block; width: 18px; height: 2px; margin: 4px auto; border-radius: 999px; background: currentColor; }

.section-grid, .section, .split-layout, .model-section, .impact-section, .contact-section { margin-top: 28px; }
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(360px, 0.9fr);
  gap: 24px;
  align-items: stretch;
  padding: 28px 0 8px;
}
.hero-copy,
.hero-panel,
.contact-card,
.info-card,
.scenario-card,
.timeline-item,
.panel-card,
.impact-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(245, 250, 255, 0.96));
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}
.hero-copy { border-radius: 34px; padding: 40px; }
.hero-copy::after,
.contact-card::after,
.panel-card::after {
  content: "";
  position: absolute;
  inset: auto -15% -48% auto;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(29, 99, 216, 0.12), transparent 66%);
  pointer-events: none;
}
.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-2);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 12px;
}
.hero h1,
.section-heading h2,
.contact-card h2,
.panel-card h2,
.panel-card h3 {
  margin: 0;
  font-family: "Georgia", "Times New Roman", serif;
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: 0.01em;
}
.hero h1 { font-size: clamp(44px, 5.8vw, 78px); max-width: 10ch; }
.hero h1 span { color: var(--accent); }
.lead, .section-heading p, .info-card p, .scenario-card p, .timeline-item p, .panel-card p, .contact-card p {
  color: var(--muted);
  line-height: 1.75;
  font-size: 15px;
}
.lead { max-width: 62ch; margin: 20px 0 0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}
.button:hover { transform: translateY(-2px); }
.button.primary {
  color: #fff;
  background: linear-gradient(135deg, #1d63d8, #0aa0c7);
  box-shadow: 0 18px 36px rgba(29, 99, 216, 0.18);
}
.button.ghost { color: var(--text); border: 1px solid rgba(29, 99, 216, 0.16); background: rgba(255, 255, 255, 0.92); }
.hero-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0;
  margin: 24px 0 0;
  list-style: none;
}
.hero-pills li {
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid rgba(29, 99, 216, 0.12);
  background: rgba(255, 255, 255, 0.92);
  color: rgba(23, 50, 79, 0.82);
  font-size: 13px;
}
.hero-panel {
  display: grid;
  gap: 16px;
  align-content: start;
  border-radius: 30px;
  padding: 18px;
}
.panel-card { border-radius: 24px; padding: 24px; }
.panel-card.spotlight {
  background:
    radial-gradient(circle at top right, rgba(29, 99, 216, 0.08), transparent 34%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(245, 250, 255, 0.96));
}
.panel-label {
  display: inline-flex;
  margin-bottom: 10px;
  color: var(--accent-2);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.panel-card h2 { font-size: 30px; }
.panel-card h3 { font-size: 24px; }
.panel-card p { margin: 14px 0 0; }
.stats-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.stat-card {
  padding: 22px;
  border-radius: 22px;
  border: 1px solid rgba(29, 99, 216, 0.12);
  background: rgba(255, 255, 255, 0.94);
}
.stat-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 28px;
  line-height: 1;
  color: var(--accent);
  font-family: "Georgia", serif;
}
.stat-card span { color: var(--muted); font-size: 13px; }
.section { padding: 6px 0; }
.section-heading { display: grid; gap: 10px; margin-bottom: 22px; max-width: 760px; }
.section-heading h2 { font-size: clamp(28px, 3.8vw, 44px); }
.section-heading p:last-child { margin: 0; }
.cards { display: grid; gap: 18px; }
.four-up { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.info-card, .scenario-card, .timeline-item, .impact-card { border-radius: 24px; padding: 24px; }
.info-card .icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(29, 99, 216, 0.12), rgba(10, 160, 199, 0.1));
  color: var(--accent);
  font-weight: 700;
}
.info-card h3, .scenario-card h3, .timeline-item h3 { margin: 18px 0 10px; font-size: 22px; line-height: 1.2; }
.split-layout { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 18px; align-items: start; }
.narrow { max-width: 420px; }
.scenario-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.scenario-card {
  min-height: 190px;
  background:
    linear-gradient(135deg, rgba(29, 99, 216, 0.08), transparent 30%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(245, 250, 255, 0.95));
}
.scenario-card::before, .timeline-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 72px;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), transparent);
}
.model-section { display: grid; grid-template-columns: 1fr 0.9fr; gap: 18px; align-items: start; }
.timeline { display: grid; gap: 16px; }
.timeline-item span { color: var(--accent-2); font-size: 12px; letter-spacing: 0.18em; }
.model-aside { display: grid; gap: 16px; }
.panel-card.muted { background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(245, 250, 255, 0.94)); }
.impact-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.impact-card {
  text-align: center;
  background:
    radial-gradient(circle at top, rgba(29, 99, 216, 0.08), transparent 42%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(245, 250, 255, 0.95));
}
.impact-card strong {
  display: block;
  font-family: "Georgia", serif;
  font-size: clamp(30px, 4vw, 46px);
  color: var(--accent);
}
.impact-card span { display: block; margin-top: 10px; color: var(--muted); }
.contact-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 18px;
  border-radius: 34px;
  padding: 34px;
}
.contact-card h2 { font-size: clamp(28px, 4vw, 42px); max-width: 14ch; }
.contact-meta { display: grid; gap: 14px; align-content: start; }
.contact-meta > div {
  padding: 18px 20px;
  border-radius: 20px;
  border: 1px solid rgba(29, 99, 216, 0.12);
  background: rgba(255, 255, 255, 0.94);
}
.contact-meta span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.contact-meta strong { font-size: 15px; }
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 26px;
  padding: 18px 22px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.88);
  color: var(--muted);
}
.footer-brand { display: grid; gap: 4px; }
.footer-brand strong { color: var(--text); font-size: 15px; }
.footer-brand span, .footer-records span { font-size: 13px; }
.footer-records { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 14px 20px; }

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms ease, transform 700ms ease;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 1080px) {
  .hero, .split-layout, .model-section, .contact-card { grid-template-columns: 1fr; }
  .four-up, .impact-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .site-header { border-radius: 28px; align-items: flex-start; }
  .nav-toggle { display: inline-grid; place-items: center; margin-left: auto; }
  .site-nav {
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    right: 0;
    display: grid;
    gap: 12px;
    padding: 18px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: var(--shadow);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
  }
  .site-nav.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .four-up, .scenario-grid, .impact-grid, .stats-grid { grid-template-columns: 1fr; }
  .hero-copy, .hero-panel, .contact-card { padding: 24px; }
  .site-footer { flex-direction: column; align-items: flex-start; }
  .footer-records { justify-content: flex-start; }
  .page-shell { width: min(calc(100% - 18px), var(--max)); padding-top: 10px; }
}
@media (max-width: 560px) {
  .site-header { top: 10px; padding: 14px; }
  .brand-logo { width: 50px; height: 50px; }
  .hero h1 { max-width: 100%; font-size: 40px; }
  .panel-card h2 { font-size: 24px; }
  .section-heading h2, .contact-card h2 { font-size: 28px; }
  .lead, .section-heading p, .info-card p, .scenario-card p, .timeline-item p, .panel-card p, .contact-card p { font-size: 14px; }
}