:root {
  --orange: #ea580c;
  --orange-2: #f97316;
  --ink: #1c1917;
  --muted: #78716c;
  --line: #e7e5e4;
  --paper: #fffaf5;
  --white: #ffffff;
  --max: 1080px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.wrap { width: min(var(--max), calc(100% - 40px)); margin: 0 auto; }

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 250, 245, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 750;
  letter-spacing: 0.04em;
}
.brand img { width: 32px; height: 32px; }
.nav a.item { margin-left: 22px; color: var(--muted); font-size: 14px; }
.nav a.item:hover { color: var(--ink); }

.hero {
  padding: 72px 0 56px;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}
.eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
  font-weight: 700;
  margin-bottom: 12px;
}
h1 {
  margin: 0 0 16px;
  font-size: 44px;
  line-height: 1.2;
  letter-spacing: 0.02em;
}
.lead { margin: 0 0 28px; color: var(--muted); font-size: 17px; max-width: 36em; }
.hero-card {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 28px;
}
.hero-card img { width: 120px; height: 120px; margin-bottom: 16px; }
.hero-card p { margin: 0; color: var(--muted); font-size: 14px; }
.hero-list {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 13px;
}
.hero-list li {
  padding: 6px 0 6px 14px;
  position: relative;
  border-top: 1px solid var(--line);
}
.hero-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 6px;
  background: var(--orange);
}

.btn {
  display: inline-block;
  background: var(--orange);
  color: #fff;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 650;
}
.btn.ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
  margin-left: 10px;
}

.section { padding: 56px 0; scroll-margin-top: 72px; }
.section h2 { margin: 0 0 8px; font-size: 26px; }
.sub { margin: 0 0 28px; color: var(--muted); }
.grid-4, .grid-3, .grid-2, .grid-features, .pipeline {
  display: grid;
  gap: 16px;
}
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-features { grid-template-columns: repeat(2, 1fr); }
.pipeline { grid-template-columns: repeat(3, 1fr); }
.card {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 22px;
}
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 14px; }
.card-extra { margin-top: 12px !important; }
.step { font-size: 12px; color: var(--orange); font-weight: 700; margin-bottom: 8px; }
.tag {
  display: inline-block;
  margin: 0 8px 8px 0;
  padding: 2px 8px;
  border: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink);
}
.radio-note { margin-top: 16px; }

.legal {
  max-width: 760px;
  padding: 40px 0 80px;
}
.legal h1 { font-size: 32px; }
.legal h2 { font-size: 18px; margin: 28px 0 8px; }
.legal p, .legal li { color: #44403c; font-size: 15px; }
.legal ol { padding-left: 1.2em; }

.footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 36px;
  color: var(--muted);
  font-size: 13px;
}
.footer .row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.footer a { margin-right: 16px; }

@media (max-width: 1080px) {
  .pipeline { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 800px) {
  .hero, .grid-4, .grid-3, .grid-2, .grid-features, .pipeline { grid-template-columns: 1fr; }
  h1 { font-size: 32px; }
  .nav-inner { height: auto; min-height: 64px; flex-wrap: wrap; padding: 10px 0; gap: 8px; }
  .nav a.item { margin-left: 0; margin-right: 14px; }
}