/* 第5套：全宽色带交错，左文右控交替，时间线新闻，暖橙石板 */
:root {
  --orange: #e85d04;
  --orange-d: #9f3900;
  --slate: #334155;
  --bg: #f1f5f9;
  --white: #ffffff;
  --ink: #1e293b;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.75;
}

a { color: var(--orange-d); }
a:hover { color: var(--orange); }

.head {
  background: var(--white);
  box-shadow: 0 1px 0 #e2e8f0;
}
.head-box {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 18px 0 0;
}
.brand {
  font-size: 28px;
  font-weight: 800;
  color: var(--slate);
  letter-spacing: 0.2em;
  text-decoration: none;
}
.brand:hover { color: var(--slate); }
.nav {
  display: flex;
  gap: 28px;
  margin-top: 12px;
}
.nav a {
  text-decoration: none;
  color: var(--slate);
  padding: 10px 0 12px;
  border-bottom: 3px solid transparent;
  font-weight: 700;
}
.nav a.current { border-bottom-color: var(--orange); color: var(--orange); }

.band { padding: 48px 0; }
.band-a { background: #fff7ed; }
.band-b { background: var(--white); }
.band-c { background: var(--slate); color: #e2e8f0; }
.band-c a { color: #fdba74; }
.band-c h2 { color: #fff; }
.inner { width: min(1080px, calc(100% - 32px)); margin: 0 auto; }

.hero-type h1 {
  font-size: 40px;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 8px 0 16px;
  text-align: center;
}
.hero-type p { text-align: center; max-width: 760px; margin: 0 auto 18px; color: #475569; }
.center-btns { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
}
.btn-fill { background: var(--orange); color: #fff; }
.btn-fill:hover { background: var(--orange-d); color: #fff; }
.btn-line { border: 2px solid var(--orange); color: var(--orange-d); background: #fff; }

.zig {
  display: flex;
  align-items: center;
  gap: 40px;
}
.zig.reverse { flex-direction: row-reverse; }
.zig .txt { flex: 1.2; }
.zig .pane {
  flex: 0.8;
  background: #fff;
  border: 1px solid #e2e8f0;
  padding: 20px;
  box-shadow: 12px 12px 0 #fed7aa;
}
.zig h2 { font-size: 26px; margin-bottom: 12px; }
.zig p { margin-bottom: 10px; }

.timeline { position: relative; margin-left: 16px; padding-left: 22px; border-left: 3px solid #fdba74; }
.timeline article { margin-bottom: 18px; }
.timeline time { color: var(--orange); font-size: 13px; font-weight: 700; }
.timeline strong { display: block; margin: 4px 0; }

.os-stack article {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #e2e8f0;
  padding: 14px 0;
  gap: 16px;
}

.faq-stack details {
  background: #fff;
  border: 1px solid #e2e8f0;
  padding: 12px 14px;
  margin-bottom: 8px;
}
.faq-stack summary { font-weight: 800; cursor: pointer; }
.faq-stack p { margin-top: 8px; }

.req {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.req article { background: #fff; padding: 16px; border-top: 4px solid var(--orange); }

.foot {
  background: #0f172a;
  color: #94a3b8;
  padding: 26px 0;
  font-size: 14px;
}
.foot p { margin-bottom: 8px; }
.foot a { color: #fdba74; }
.safe { color: #86efac; }

@media (max-width: 800px) {
  .hero-type h1 { font-size: 28px; }
  .zig, .zig.reverse { flex-direction: column; }
  .req { grid-template-columns: 1fr; }
  .os-stack article { flex-direction: column; align-items: flex-start; }
}