/* Stellar — 星轨素雅 */
:root {
  --st-bg: #f8fafc;
  --st-ink: #0f172a;
  --st-muted: #64748b;
  --st-line: rgba(15, 23, 42, 0.08);
  --st-accent: #4f46e5;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Plus Jakarta Sans", "Noto Sans SC", system-ui, sans-serif;
  background: var(--st-bg);
  color: var(--st-ink);
  min-height: 100vh;
  position: relative;
}

.st-noise {
  pointer-events: none;
  position: fixed;
  inset: 0;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  z-index: 0;
}

.st-header {
  position: relative;
  z-index: 1;
  border-bottom: 1px solid var(--st-line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(248, 250, 252, 0.75));
  backdrop-filter: blur(8px);
}

.st-nav {
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
}

.st-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--st-ink);
  text-decoration: none;
  font-size: 1.05rem;
  margin-right: auto;
  flex: 1 1 auto;
  min-width: 0;
  max-width: 52%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.st-brand-mark {
  width: 11px;
  height: 11px;
  border-radius: 3px;
  background: linear-gradient(135deg, var(--st-accent), #a855f7);
  transform: rotate(12deg);
}

.st-links {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
  flex-shrink: 0;
}

.st-links a {
  text-decoration: none;
  color: var(--st-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.st-links a:hover { color: var(--st-ink); }

.st-pill {
  padding: 0.45rem 1rem !important;
  border-radius: 999px;
  background: var(--st-ink) !important;
  color: #fff !important;
  font-weight: 600 !important;
}

.st-hero {
  max-width: 1080px;
  margin: 0 auto;
  padding: 4.5rem 1.5rem 3rem;
}

.st-eyebrow {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--st-accent);
  margin-bottom: 1rem;
}

.st-title {
  font-size: clamp(2.25rem, 5vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.08;
  max-width: 14ch;
  margin-bottom: 1.25rem;
}

.st-title em {
  font-family: "Instrument Serif", Georgia, serif;
  font-style: italic;
  font-weight: 400;
  color: #4338ca;
}

.st-desc {
  max-width: 32rem;
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--st-muted);
  margin-bottom: 1.75rem;
}

.st-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.st-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.4rem;
  border-radius: 12px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.15s, box-shadow 0.2s;
}

.st-btn:active { transform: scale(0.98); }

.st-btn--dark {
  background: var(--st-ink);
  color: #fff;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.18);
}

.st-btn--line {
  background: #fff;
  border-color: var(--st-line);
  color: var(--st-ink);
}

.st-main {
  position: relative;
  z-index: 1;
}

.st-highlights {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem 2.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.st-hl {
  padding: 1.5rem 1.35rem;
  border-radius: 18px;
  background: #fff;
  border: 1px solid var(--st-line);
  box-shadow: 0 10px 40px rgba(15, 23, 42, 0.04);
}

.st-hl-num {
  font-size: 0.75rem;
  font-weight: 800;
  color: #c7d2fe;
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 0.75rem;
}

.st-hl h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.st-hl p {
  font-size: 0.875rem;
  color: var(--st-muted);
  line-height: 1.65;
}

.st-footer {
  max-width: 1080px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--st-muted);
}

.st-beian {
  margin-top: 0.75rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem 1rem;
}

.st-beian a {
  color: #94a3b8;
  text-decoration: none;
}

.st-beian a:hover { color: var(--st-accent); }