:root {
  --bg: #07111f;
  --bg-soft: #0d1b2d;
  --panel: rgba(17, 35, 57, 0.78);
  --panel-strong: #11243a;
  --text: #f3f7fb;
  --muted: #a9bbcf;
  --line: rgba(169, 187, 207, 0.18);
  --blue: #67b7ff;
  --cyan: #63e6d5;
  --gold: #f0c36a;
  --radius: 22px;
  --shadow: 0 22px 70px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 82% 8%, rgba(55, 142, 196, 0.20), transparent 30rem),
    radial-gradient(circle at 8% 42%, rgba(54, 202, 174, 0.10), transparent 26rem),
    var(--bg);
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.65;
}

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

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }

.shell { width: min(1160px, calc(100% - 40px)); margin: 0 auto; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(7, 17, 31, 0.78);
  backdrop-filter: blur(18px);
}

.nav {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand { font-weight: 700; letter-spacing: 0.04em; }
.brand span { color: var(--cyan); }

.nav-links { display: flex; align-items: center; gap: 24px; color: var(--muted); }
.nav-links a:hover { color: var(--text); }

.hero { padding: 104px 0 72px; }
.eyebrow { color: var(--cyan); font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; }

h1 {
  max-width: 1020px;
  margin: 18px 0 22px;
  font-size: clamp(2.5rem, 5.5vw, 4.4rem);
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.hero-copy { max-width: 720px; color: var(--muted); font-size: 1.12rem; }
.actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 21px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  font-weight: 700;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.button.primary { color: #04131c; border-color: transparent; background: linear-gradient(135deg, var(--cyan), var(--blue)); }
.button:hover { transform: translateY(-2px); border-color: rgba(103, 183, 255, 0.55); }

.section { padding: 58px 0; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 26px; }
.section h2 { margin: 0; font-size: clamp(1.8rem, 4vw, 2.8rem); letter-spacing: -0.035em; }
.section-note { max-width: 600px; margin: 8px 0 0; color: var(--muted); }

.grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 18px; }

.card {
  grid-column: span 6;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  padding: 28px;
  overflow: hidden;
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(19, 44, 70, 0.92), var(--panel));
  box-shadow: var(--shadow);
  transition: transform 180ms ease, border-color 180ms ease;
}

.card::after {
  content: "";
  width: 170px;
  height: 170px;
  position: absolute;
  right: -58px;
  bottom: -72px;
  border-radius: 50%;
  background: var(--accent, var(--blue));
  opacity: 0.10;
  filter: blur(2px);
}

.card:hover { transform: translateY(-5px); border-color: color-mix(in srgb, var(--accent, var(--blue)) 55%, transparent); }
.card.wide { grid-column: span 12; min-height: 220px; }
.tag { color: var(--accent, var(--blue)); font-size: 0.82rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
.card h3 { margin: 16px 0 10px; font-size: 1.55rem; line-height: 1.25; }
.card p { max-width: 620px; margin: 0; color: var(--muted); }
.card-link { margin-top: auto; padding-top: 28px; font-weight: 700; }
.card-link span { color: var(--accent, var(--blue)); }

.summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
}

.summary div { padding: 24px; background: var(--bg-soft); }
.summary strong { display: block; margin-bottom: 4px; font-size: 1.35rem; }
.summary span { color: var(--muted); }

.footer { margin-top: 64px; padding: 34px 0 44px; border-top: 1px solid var(--line); color: var(--muted); }
.footer-row { display: flex; justify-content: space-between; gap: 24px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button, .card { transition: none; }
  .button:hover, .card:hover { transform: none; }
}

@media (max-width: 760px) {
  .shell { width: min(100% - 26px, 1160px); }
  .nav { min-height: 62px; }
  .nav-links a:last-child { display: none; }
  .hero { padding: 72px 0 44px; }
  h1 { font-size: clamp(2rem, 8.6vw, 3.4rem); }
  .section { padding: 42px 0; }
  .section-heading { display: block; }
  .card, .card.wide { grid-column: span 12; min-height: 245px; }
  .summary { grid-template-columns: 1fr; }
  .footer-row { display: block; }
  .footer-row span { display: block; }
  .footer-row span + span { margin-top: 6px; }
}