:root {
  --bg: #ffffff;
  --bg-soft: #f5f6f8;
  --text: #16181d;
  --muted: #5d6470;
  --line: #e4e6eb;
  --accent: #3b5bfd;
  --accent-text: #ffffff;
  --card: #ffffff;
  --radius: 14px;
  --max: 1080px;
  --shadow: 0 10px 30px rgba(20, 30, 60, .08);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --bg-soft: #171a20;
    --text: #eceef2;
    --muted: #9aa1ad;
    --line: #2a2e36;
    --accent: #6d86ff;
    --card: #171a20;
    --shadow: 0 10px 30px rgba(0, 0, 0, .35);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* 顶栏 */
.nav { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(180%) blur(14px); border-bottom: 1px solid var(--line); }
.nav .wrap { display: flex; align-items: center; gap: 24px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand-mark { width: 28px; height: 28px; border-radius: 8px; background: linear-gradient(160deg, #37c2f2, #4b55f2);
  display: grid; place-items: center; color: #fff; font-size: 15px; }
.nav-links { display: flex; gap: 20px; margin-left: auto; font-size: 15px; }
.nav-links a { color: var(--muted); }
.nav-links a:hover, .nav-links a.active { color: var(--text); text-decoration: none; }

/* 通用 */
.hero { padding: 80px 0 48px; text-align: center; }
.hero h1 { font-size: clamp(32px, 5vw, 52px); line-height: 1.15; margin: 0 0 16px; letter-spacing: -.01em; }
.hero p.lead { font-size: clamp(17px, 2.2vw, 20px); color: var(--muted); max-width: 680px; margin: 0 auto 28px; }
.app-icon { width: 104px; height: 104px; margin: 0 auto 20px; }
.btns { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 22px; border-radius: 999px; font-weight: 600;
  border: 1px solid var(--line); color: var(--text); background: var(--card); }
.btn:hover { text-decoration: none; filter: brightness(.97); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn[aria-disabled="true"] { opacity: .55; pointer-events: none; }
.note { color: var(--muted); font-size: 14px; margin-top: 12px; }

section { padding: 56px 0; }
section.soft { background: var(--bg-soft); }
h2 { font-size: clamp(24px, 3.2vw, 32px); margin: 0 0 12px; text-align: center; }
.sub { text-align: center; color: var(--muted); margin: 0 auto 36px; max-width: 640px; }

.shot { border-radius: 16px; box-shadow: var(--shadow); border: 1px solid var(--line); margin: 0 auto; width: 100%; max-width: min(960px, 100%); }

.grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.card h3 { margin: 6px 0 6px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card .ico { font-size: 26px; }

/* 产品卡片（首页） */
.app-card { display: flex; gap: 18px; align-items: center; color: var(--text); }
.app-card:hover { text-decoration: none; border-color: var(--accent); }
.app-card img { width: 64px; height: 64px; flex: none; }
.app-card.soon { opacity: .6; }
.tag { display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 999px; background: var(--bg-soft);
  color: var(--muted); border: 1px solid var(--line); margin-left: 6px; vertical-align: 2px; }

/* 价格 */
.plans { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); max-width: 760px; margin: 0 auto; }
.plan { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.plan.pro { border: 2px solid var(--accent); }
.plan h3 { margin: 0; font-size: 20px; }
.price { font-size: 34px; font-weight: 700; margin: 10px 0 4px; }
.price small { font-size: 15px; font-weight: 500; color: var(--muted); }
.plan ul { padding-left: 0; list-style: none; margin: 18px 0 22px; }
.plan li { padding: 5px 0 5px 26px; position: relative; }
.plan li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
.plan li.no::before { content: "–"; color: var(--muted); }
.plan .btn { width: 100%; justify-content: center; }

/* FAQ / 文档 */
.faq { max-width: 760px; margin: 0 auto; }
details { border-bottom: 1px solid var(--line); padding: 14px 0; }
summary { cursor: pointer; font-weight: 600; list-style: none; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; float: right; color: var(--muted); }
details[open] summary::after { content: "–"; }
details p, details ol, details ul { color: var(--muted); margin: 10px 0 0; }
.doc { max-width: 760px; margin: 0 auto; padding: 56px 20px; }
.doc h1 { font-size: 32px; margin: 0 0 8px; }
.doc h2 { text-align: left; font-size: 22px; margin: 36px 0 10px; }
.doc p, .doc li { color: var(--text); }
.doc .meta { color: var(--muted); font-size: 14px; }
.callout { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; margin: 16px 0; }
kbd { font: 13px ui-monospace, SFMono-Regular, Menlo, monospace; padding: 1px 6px; border: 1px solid var(--line);
  border-bottom-width: 2px; border-radius: 6px; background: var(--card); }

/* 页脚 */
footer { border-top: 1px solid var(--line); padding: 32px 0 40px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; }
footer nav { display: flex; gap: 18px; flex-wrap: wrap; }
footer a { color: var(--muted); }

@media (max-width: 640px) {
  .nav-links { gap: 14px; font-size: 14px; }
  .hero { padding: 56px 0 32px; }
  section { padding: 44px 0; }
}