/* 观澜云官网样式。颜色只在 :root 定义（浅色 / 深色两套），页面里不写死颜色。 */
:root {
  color-scheme: light dark;
  --bg: #f5f8f7;
  --bg-alt: #ecf3f1;
  --surface: #ffffff;
  --text: #0f1f1c;
  --muted: #4a5d59;
  --faint: #6b7d79;
  --border: #dce6e3;
  --primary: #037a69;
  --primary-hover: #02695a;
  --primary-fg: #ffffff;
  --primary-soft: #e3f3ef;
  --highlight: #9dd739;
  --brand-from: #00312e;
  --brand-to: #005546;
  --on-brand: #eaf6f2;
  --on-brand-muted: #b9d6cf;
  --warn-bg: #fff7e0;
  --warn-text: #7a5300;
  --warn-border: #f0d88a;
  --ok: #1d7a3a;
  --shadow: 0 1px 2px rgba(15, 31, 28, .06), 0 8px 24px rgba(15, 31, 28, .06);
  --radius: 14px;
  --max: 1160px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", "WenQuanYi Micro Hei", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c1413;
    --bg-alt: #101a19;
    --surface: #142120;
    --text: #e4eeec;
    --muted: #a3b7b2;
    --faint: #859995;
    --border: #233532;
    --primary: #36c9a1;
    --primary-hover: #5ad6b3;
    --primary-fg: #062420;
    --primary-soft: #11302a;
    --highlight: #a8e04a;
    --brand-from: #002020;
    --brand-to: #003a31;
    --warn-bg: #2b2310;
    --warn-text: #f1d58a;
    --warn-border: #5a4a1c;
    --ok: #5fd08a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 76px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 var(--font);
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-underline-offset: 3px; }
a:hover { color: var(--primary-hover); }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
h1, h2, h3 { line-height: 1.3; margin: 0; letter-spacing: .01em; }
p { margin: 0; }
.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 16px; }
@media (min-width: 768px) { .wrap { padding: 0 32px; } }
.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 100; }
.skip:focus { left: 8px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 44px; padding: 0 20px; border-radius: 10px;
  font: 600 15px/1 var(--font); text-decoration: none; white-space: nowrap;
  border: 1px solid transparent; cursor: pointer; transition: background .15s, border-color .15s;
}
.btn-primary { background: var(--primary); color: var(--primary-fg); }
.btn-primary:hover { background: var(--primary-hover); color: var(--primary-fg); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { min-height: 36px; padding: 0 14px; font-size: 14px; }

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: saturate(160%) blur(10px); backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-row { display: flex; align-items: center; gap: 16px; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 18px; }
.brand:hover { color: var(--text); }
.brand img { width: 32px; height: 32px; }
.nav { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.nav a { color: var(--muted); text-decoration: none; font-size: 15px; padding: 8px 10px; border-radius: 8px; }
.nav a:hover { color: var(--text); background: var(--bg-alt); }
.nav .btn { margin-left: 6px; }
.nav .btn-primary, .nav .btn-primary:hover { color: var(--primary-fg); background: var(--primary); }
.nav-toggle { display: none; margin-left: auto; width: 44px; height: 44px; border: 1px solid var(--border); background: var(--surface); color: var(--text); border-radius: 10px; cursor: pointer; }
.nav-toggle svg { width: 20px; height: 20px; }
@media (max-width: 899px) {
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .nav {
    display: none; position: absolute; left: 0; right: 0; top: 64px;
    flex-direction: column; align-items: stretch; gap: 2px;
    padding: 8px 16px 16px; background: var(--bg); border-bottom: 1px solid var(--border); box-shadow: var(--shadow);
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px; font-size: 16px; }
  .nav .btn { margin: 6px 0 0; }
}

/* ---------- 首屏 ---------- */
.hero { padding: 48px 0 56px; text-align: center; background:
  radial-gradient(60% 50% at 50% 0%, var(--primary-soft), transparent 70%); }
.hero-logo { width: 132px; margin: 0 auto 20px; }
.pill {
  display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px; border-radius: 999px;
  background: var(--surface); border: 1px solid var(--border); color: var(--muted); font-size: 14px;
}
.pill i { width: 8px; height: 8px; border-radius: 50%; background: var(--highlight); flex: none; }
.hero h1 { font-size: clamp(26px, 6.8vw, 52px); margin-top: 18px; }
.hero .lead { font-size: clamp(17px, 2.6vw, 21px); color: var(--muted); margin: 14px auto 0; max-width: 680px; }
.cta-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 28px; }
.hero .note { margin-top: 16px; font-size: 14px; color: var(--faint); }
@media (min-width: 768px) { .hero { padding: 72px 0 80px; } .hero-logo { width: 160px; } }

/* 首屏下方：一稿多版示意 */
.flow-demo {
  margin: 44px auto 0; max-width: 980px; text-align: left;
  display: grid; gap: 14px; grid-template-columns: 1fr; align-items: center;
}
@media (min-width: 860px) { .flow-demo { grid-template-columns: 1fr 48px 1.25fr; } }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
}
.draft { padding: 18px; }
.draft .label, .ver .label { font-size: 12px; color: var(--faint); letter-spacing: .04em; }
.draft h3 { font-size: 17px; margin: 6px 0 8px; }
.draft p { font-size: 14px; color: var(--muted); }
.draft .assets { display: flex; gap: 6px; margin-top: 12px; }
.draft .assets span { width: 44px; height: 44px; border-radius: 8px; background: linear-gradient(135deg, var(--primary-soft), var(--bg-alt)); border: 1px solid var(--border); }
.arrow { display: flex; justify-content: center; color: var(--primary); }
.arrow svg { width: 32px; height: 32px; transform: rotate(90deg); }
@media (min-width: 860px) { .arrow svg { transform: none; } }
.versions { display: grid; gap: 10px; }
.ver { padding: 12px 14px; display: grid; grid-template-columns: 1fr auto; gap: 2px 12px; align-items: center; }
.ver strong { font-size: 15px; }
.ver .meta { grid-column: 1 / -1; font-size: 13px; color: var(--muted); }
.tag { font-size: 12px; padding: 2px 8px; border-radius: 999px; background: var(--bg-alt); color: var(--muted); border: 1px solid var(--border); white-space: nowrap; }
.tag.ok { color: var(--ok); }
.tag.wait { background: var(--warn-bg); color: var(--warn-text); border-color: var(--warn-border); }
.tag.plan { background: var(--primary-soft); color: var(--primary); border-color: transparent; }

/* ---------- 通用区块 ---------- */
section { padding: 64px 0; }
section.alt { background: var(--bg-alt); }
.section-head { max-width: 720px; margin-bottom: 32px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.eyebrow { display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: .08em; color: var(--primary); margin-bottom: 8px; }
.section-head h2 { font-size: clamp(24px, 4.6vw, 34px); }
.section-head p { color: var(--muted); margin-top: 10px; }
@media (min-width: 768px) { section { padding: 88px 0; } }

.grid { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .grid-2, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 960px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } .grid-4 { grid-template-columns: repeat(4, 1fr); } }

.pain { padding: 22px; }
.pain h3 { font-size: 17px; margin-bottom: 8px; }
.pain p { color: var(--muted); font-size: 15px; }
.pain .no { display: inline-block; font-size: 13px; font-weight: 700; color: var(--primary); margin-bottom: 8px; }

/* 流程 */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; grid-template-columns: 1fr; counter-reset: step; }
@media (min-width: 640px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .steps { grid-template-columns: repeat(6, 1fr); } }
.steps li { position: relative; padding: 18px; counter-increment: step; }
.steps li::before {
  content: counter(step); display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px; border-radius: 50%; background: var(--primary); color: var(--primary-fg);
  font-weight: 700; font-size: 14px; margin-bottom: 10px;
}
.steps li.human::before { background: var(--highlight); color: #102a10; }
.steps h3 { font-size: 16px; margin-bottom: 6px; }
.steps p { font-size: 14px; color: var(--muted); }
.steps .who { display: inline-block; margin-top: 10px; font-size: 12px; color: var(--faint); }
.legend { margin-top: 16px; font-size: 14px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 8px 20px; }
.legend span::before { content: ""; display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 6px; vertical-align: 0; background: var(--primary); }
.legend span.h::before { background: var(--highlight); }

/* 功能 */
.feature-group { padding: 24px; }
.feature-group h3 { font-size: 18px; display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.feature-group h3 svg { width: 22px; height: 22px; color: var(--primary); flex: none; }
.feature-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.feature-list li { padding-left: 16px; border-left: 3px solid var(--primary-soft); }
.feature-list strong { display: block; font-size: 15px; }
.feature-list span { display: block; font-size: 14px; color: var(--muted); margin-top: 2px; }

/* 平台 */
.platform-group { padding: 24px; }
.platform-group h3 { font-size: 17px; margin-bottom: 14px; }
.chips { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 10px; }
.chips li { display: inline-flex; align-items: center; gap: 8px; padding: 8px 14px; border-radius: 10px; border: 1px solid var(--border); background: var(--bg); font-size: 15px; font-weight: 600; }
.chips li.soon { color: var(--faint); font-weight: 500; border-style: dashed; }
.chips li .tag { font-weight: 500; }
.fine { margin-top: 16px; font-size: 14px; color: var(--faint); }

/* 合规与安全：品牌渐变色带 */
.trust { background: linear-gradient(135deg, var(--brand-from), var(--brand-to)); color: var(--on-brand); }
.trust .eyebrow { color: var(--highlight); }
.trust .section-head p { color: var(--on-brand-muted); }
.trust-item { padding: 22px; border-radius: var(--radius); background: rgba(255, 255, 255, .06); border: 1px solid rgba(255, 255, 255, .12); }
.trust-item svg { width: 26px; height: 26px; color: var(--highlight); margin-bottom: 10px; }
.trust-item h3 { font-size: 17px; margin-bottom: 6px; color: #fff; }
.trust-item p { font-size: 14px; color: var(--on-brand-muted); }
.trust a { color: var(--highlight); }
@media (min-width: 960px) { .trust .grid { grid-template-columns: repeat(5, 1fr); } }

/* FAQ */
.faq { max-width: 820px; margin: 0 auto; display: grid; gap: 10px; }
.faq details { padding: 0; }
.faq summary {
  cursor: pointer; list-style: none; padding: 18px 48px 18px 20px; font-weight: 600; position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; position: absolute; right: 20px; top: 50%; width: 10px; height: 10px; margin-top: -7px;
  border-right: 2px solid var(--faint); border-bottom: 2px solid var(--faint); transform: rotate(45deg); transition: transform .15s;
}
.faq details[open] summary::after { transform: rotate(-135deg); margin-top: -2px; }
.faq details > div { padding: 0 20px 18px; color: var(--muted); font-size: 15px; }
.faq details > div p + p { margin-top: 8px; }

/* 结尾行动区 */
.cta-band { text-align: center; padding: 40px 20px; }
.cta-band h2 { font-size: clamp(22px, 4vw, 30px); }
.cta-band p { color: var(--muted); margin-top: 8px; }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--border); padding: 40px 0 32px; font-size: 14px; color: var(--muted); }
.footer-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px; }
.footer-brand p { margin-top: 8px; max-width: 360px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 20px; list-style: none; margin: 0; padding: 0; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--primary); text-decoration: underline; }
.footer-meta { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; gap: 6px 18px; color: var(--faint); }
.footer-license:empty { display: none; }

/* ---------- 法律文本页 ---------- */
.doc { max-width: 820px; margin: 0 auto; padding: 40px 16px 72px; }
.doc h1 { font-size: clamp(26px, 5vw, 34px); }
.doc .dates { margin-top: 10px; color: var(--faint); font-size: 14px; }
.draft-note {
  margin: 20px 0 8px; padding: 14px 16px; border-radius: 10px;
  background: var(--warn-bg); color: var(--warn-text); border: 1px solid var(--warn-border); font-size: 15px;
}
.doc .toc { margin: 24px 0; padding: 16px 20px; }
.doc .toc strong { display: block; margin-bottom: 6px; }
.doc .toc ol { margin: 0; padding-left: 22px; columns: 2; column-gap: 32px; font-size: 15px; }
@media (max-width: 599px) { .doc .toc ol { columns: 1; } }
.doc h2 { font-size: 21px; margin: 36px 0 12px; padding-top: 8px; }
.doc h3 { font-size: 17px; margin: 22px 0 8px; }
.doc p, .doc li { color: var(--text); }
.doc p { margin: 10px 0; }
.doc ul, .doc ol { padding-left: 22px; }
.doc li { margin: 6px 0; }
.doc .table-wrap { overflow-x: auto; margin: 12px 0; border: 1px solid var(--border); border-radius: 10px; }
.doc table { border-collapse: collapse; width: 100%; font-size: 15px; background: var(--surface); }
.doc th, .doc td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
.doc th { background: var(--bg-alt); font-weight: 600; white-space: nowrap; }
.doc tr:last-child td { border-bottom: 0; }
.doc .lede { color: var(--muted); }
.ph { background: var(--warn-bg); color: var(--warn-text); padding: 0 4px; border-radius: 4px; }

/* ---------- 404 ---------- */
.notfound { min-height: calc(100vh - 64px - 140px); display: grid; place-items: center; text-align: center; padding: 56px 16px; }
.notfound .code { font-size: 64px; font-weight: 800; color: var(--primary); line-height: 1; }
.notfound h1 { font-size: 24px; margin-top: 12px; }
.notfound p { color: var(--muted); margin-top: 8px; }
.notfound .cta-row { margin-top: 24px; }