:root { --blue: #2f5bea; --blue-d: #1d3fb8; --ink: #17203a; --mut: #5b6478; --line: #e3e8f3; --bg2: #f5f7fc; --ok: #1f9d55; --r: 14px; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 70px; }
body { margin: 0; font: 16px/1.7 -apple-system, "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif; color: var(--ink); background: #fff; }
a { color: var(--blue); }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
section { padding: 72px 0; }
section.wrap { padding: 72px 24px; }
h1 { font-size: 46px; line-height: 1.2; margin: 0 0 18px; letter-spacing: 1px; }
h2 { font-size: 30px; margin: 0 0 28px; }
h3 { margin: 0 0 6px; font-size: 18px; }
.sub { color: var(--mut); margin: -18px 0 24px; }
.small { color: var(--mut); font-size: 14px; }
.note { color: var(--mut); margin-top: 26px; }
code { background: var(--bg2); padding: 1px 6px; border-radius: 4px; font-size: 14px; }

.top { position: sticky; top: 0; z-index: 9; background: rgba(255, 255, 255, .92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--ink); text-decoration: none; }
nav { display: flex; align-items: center; gap: 22px; }
nav a { color: var(--ink); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--blue); }

.btn { display: inline-block; background: var(--blue); color: #fff !important; text-decoration: none; padding: 12px 26px; border-radius: 10px; font-weight: 600; border: 2px solid var(--blue); transition: .15s; }
.btn:hover { background: var(--blue-d); border-color: var(--blue-d); }
.btn.ghost { background: transparent; color: var(--blue) !important; }
.btn.ghost:hover { background: #eef2ff; }
.btn.sm { padding: 6px 16px; font-size: 14px; }
.btn.big { font-size: 20px; padding: 16px 40px; }

.hero { background: linear-gradient(160deg, #eef3ff 0%, #fff 60%); padding: 64px 0 80px; }
.hero-in { display: grid; grid-template-columns: 1fr 1.15fr; gap: 48px; align-items: center; }
.lead { font-size: 18px; color: #36405a; }
.cta { display: flex; gap: 14px; margin: 26px 0 14px; }
.shot { border-radius: var(--r); overflow: hidden; box-shadow: 0 20px 50px rgba(29, 63, 184, .18); border: 1px solid var(--line); background: #fff; min-height: 200px; }
.shot img { display: block; width: 100%; }
.shot.noimg { background: linear-gradient(135deg, #dbe5ff, #f3f6ff); }
.shot.noimg img { display: none; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { border: 1px solid var(--line); border-radius: var(--r); padding: 22px 22px 16px; background: #fff; }
.card p { color: var(--mut); margin: 0; font-size: 15px; }

.band { background: var(--bg2); }
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; counter-reset: s; }
.steps li { background: #fff; border-radius: var(--r); padding: 22px; border: 1px solid var(--line); counter-increment: s; position: relative; }
.steps li::before { content: counter(s); position: absolute; top: -14px; left: 20px; width: 30px; height: 30px; border-radius: 50%; background: var(--blue); color: #fff; font-weight: 700; display: grid; place-items: center; }
.steps b { display: block; margin: 6px 0 4px; font-size: 18px; }
.steps span { color: var(--mut); font-size: 15px; }

.demos { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.demos figure { margin: 0; }
.demos video { width: 100%; border-radius: var(--r); border: 1px solid var(--line); background: #f0f3fa; aspect-ratio: 16 / 10; }
.demos figcaption { color: var(--mut); font-size: 15px; margin-top: 6px; }

.two { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.two h2 { font-size: 24px; margin-bottom: 16px; }
.ticks { list-style: none; padding: 0; margin: 0; }
.ticks li { padding-left: 28px; position: relative; margin-bottom: 12px; color: #36405a; }
.ticks li::before { content: "✓"; position: absolute; left: 0; color: var(--ok); font-weight: 700; }
.ticks.no li::before { content: "✕"; color: #c0392b; }

.plans { display: grid; grid-template-columns: repeat(2, minmax(0, 360px)); gap: 24px; justify-content: center; }
.plan { border: 1px solid var(--line); border-radius: var(--r); padding: 28px; }
.plan.hot { border: 2px solid var(--blue); box-shadow: 0 12px 30px rgba(47, 91, 234, .12); }
.price { font-size: 34px; font-weight: 700; margin: 8px 0 12px; }
.price small { font-size: 15px; color: var(--mut); font-weight: 400; }
.plan ul { padding-left: 20px; color: #36405a; min-height: 120px; }
.contact { background: #eef3ff; padding: 10px 14px; border-radius: 8px; font-size: 15px; }

details { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 14px 18px; margin-bottom: 10px; }
summary { cursor: pointer; font-weight: 600; }
details p { color: #36405a; margin: 10px 0 0; }

.dl { text-align: center; }
footer { border-top: 1px solid var(--line); padding: 26px 0; color: var(--mut); font-size: 14px; text-align: center; }

/* 教程页 */
.guide { max-width: 820px; }
.guide h1 { font-size: 34px; }
.guide ol.g > li { margin-bottom: 26px; }
.guide ol.g > li > b { font-size: 18px; }
.tip { background: #fff8e6; border: 1px solid #ffe2a3; border-radius: 10px; padding: 12px 16px; margin: 18px 0; }
.guide table { border-collapse: collapse; width: 100%; margin: 10px 0; font-size: 15px; }
.guide td, .guide th { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.guide th { background: var(--bg2); }

@media (max-width: 860px) {
  h1 { font-size: 34px; }
  nav a:not(.btn) { display: none; }
  .hero-in, .two, .grid, .steps, .demos, .plans { grid-template-columns: 1fr; }
}
.contact .copy { margin-left: 6px; font-size: 13px; padding: 2px 10px; border-radius: 6px; border: 1px solid var(--blue); background: #fff; color: var(--blue); cursor: pointer; }