/* ==========================================================================
   WhatsApp网页版 知识站 — 全站样式表
   纯本地资源，无第三方依赖
   ========================================================================== */

:root {
  --green: #25d366;
  --green-dark: #128c7e;
  --green-deep: #075e54;
  --green-soft: #e7f8ee;
  --ink: #10241f;
  --ink-2: #33453f;
  --muted: #64766f;
  --line: #e2ebe6;
  --bg: #ffffff;
  --bg-soft: #f5faf7;
  --white: #fff;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(16, 36, 31, .06), 0 4px 14px rgba(16, 36, 31, .05);
  --shadow-md: 0 8px 30px rgba(16, 36, 31, .09);
  --max: 1140px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-2);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }

a { color: var(--green-dark); text-decoration: none; }
a:hover { color: var(--green-deep); }

h1, h2, h3, h4 {
  color: var(--ink);
  line-height: 1.3;
  margin: 0 0 .6em;
  font-weight: 700;
  letter-spacing: -.01em;
}

h1 { font-size: clamp(1.62rem, 4.2vw, 2.85rem); }
h2 { font-size: clamp(1.35rem, 2.6vw, 1.85rem); }
h3 { font-size: 1.16rem; }
p { margin: 0 0 1.1em; }
ul, ol { margin: 0 0 1.2em; padding-left: 1.35em; }
li { margin-bottom: .45em; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--ink);
  font-size: 1.02rem;
  letter-spacing: -.01em;
  flex-shrink: 0;
}
.brand:hover { color: var(--ink); }
.brand-mark {
  width: 34px; height: 34px; flex: 0 0 34px;
  border-radius: 10px;
  background: linear-gradient(145deg, var(--green), var(--green-dark));
  display: grid; place-items: center;
  box-shadow: 0 4px 12px rgba(37, 211, 102, .3);
}
.brand-mark svg { width: 19px; height: 19px; }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--ink-2);
  font-size: .94rem;
  font-weight: 500;
  transition: background .16s, color .16s;
  white-space: nowrap;
}
.nav-links a:hover { background: var(--bg-soft); color: var(--ink); }
.nav-links a[aria-current="page"] { color: var(--green-deep); background: var(--green-soft); font-weight: 600; }

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  cursor: pointer;
  padding: 0;
  place-items: center;
}
.nav-toggle span {
  display: block; width: 18px; height: 2px; background: var(--ink);
  position: relative;
}
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 18px; height: 2px; background: var(--ink);
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: .96rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .16s, box-shadow .16s, background .16s;
  font-family: inherit;
}
.btn-primary {
  background: linear-gradient(145deg, var(--green), var(--green-dark));
  color: #fff;
  box-shadow: 0 6px 18px rgba(18, 140, 126, .28);
}
.btn-primary:hover { color: #fff; transform: translateY(-1px); box-shadow: 0 9px 24px rgba(18, 140, 126, .34); }
.btn-ghost {
  background: #fff;
  color: var(--ink);
  border-color: var(--line);
  box-shadow: var(--shadow-sm);
}
.btn-ghost:hover { color: var(--ink); border-color: #cfe0d7; }
.btn svg { width: 17px; height: 17px; }

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  padding: 72px 0 64px;
  background:
    radial-gradient(900px 420px at 82% -8%, rgba(37, 211, 102, .16), transparent 62%),
    radial-gradient(700px 360px at 6% 4%, rgba(18, 140, 126, .10), transparent 58%),
    var(--bg-soft);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  align-items: center;
}
.hero h1 { margin-bottom: 18px; }
.hero h1 em {
  font-style: normal;
  background: linear-gradient(120deg, var(--green-dark), var(--green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-lead {
  font-size: 1.06rem;
  color: var(--ink-2);
  max-width: 34em;
  margin-bottom: 24px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 22px; }
.hero-points {
  display: flex; flex-wrap: wrap; gap: 8px 20px;
  list-style: none; padding: 0; margin: 0;
  font-size: .9rem; color: var(--muted);
}
.hero-points li { display: flex; align-items: center; gap: 7px; margin: 0; }
.hero-points li::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--green); flex: 0 0 6px;
}

/* 首屏二维码卡片 */
.qr-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 26px;
  box-shadow: var(--shadow-md);
  text-align: center;
  position: relative;
}
.qr-card::after {
  content: "";
  position: absolute; inset: 10px;
  border: 1px dashed rgba(18, 140, 126, .18);
  border-radius: 15px;
  pointer-events: none;
}
.qr-box {
  width: 172px; height: 172px;
  margin: 0 auto 16px;
  padding: 12px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid var(--line);
  display: grid; place-items: center;
}
.qr-box svg { width: 100%; height: 100%; }
.qr-card h3 { margin-bottom: 6px; font-size: 1.02rem; }
.qr-card p { font-size: .86rem; color: var(--muted); margin-bottom: 0; }
.qr-steps { list-style: none; padding: 0; margin: 16px 0 0; text-align: left; font-size: .87rem; }
.qr-steps li { display: flex; gap: 9px; margin-bottom: 8px; color: var(--ink-2); }
.qr-steps b {
  flex: 0 0 20px; height: 20px; border-radius: 50%;
  background: var(--green-soft); color: var(--green-dark);
  font-size: .72rem; font-weight: 700;
  display: grid; place-items: center; margin-top: 2px;
}

/* 浏览器窗口示意 */
.mock {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 18px 50px -12px rgba(16, 36, 31, .22), 0 4px 12px rgba(16, 36, 31, .06);
  overflow: hidden;
}
.mock-body { overflow: hidden; }
.mock-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 11px 14px;
  background: #f7faf8;
  border-bottom: 1px solid var(--line);
}
.mock-dot { width: 9px; height: 9px; border-radius: 50%; background: #dfe8e3; }
.mock-dot:nth-child(1) { background: #ff5f57; }
.mock-dot:nth-child(2) { background: #febc2e; }
.mock-dot:nth-child(3) { background: #28c840; }
.mock-url {
  flex: 1;
  margin-left: 8px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 7px;
  font-size: .7rem;
  color: var(--muted);
  padding: 4px 10px;
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mock-body { display: grid; grid-template-columns: 36% 1fr; min-height: 262px; }
.mock-side { background: #f7faf8; border-right: 1px solid var(--line); padding: 12px; }
.mock-search {
  height: 24px; border-radius: 6px; background: #fff; border: 1px solid var(--line);
  margin-bottom: 12px;
}
.mock-item { display: flex; gap: 9px; align-items: center; padding: 7px 4px; }
.mock-avatar {
  width: 26px; height: 26px; flex: 0 0 26px; border-radius: 50%;
  background: linear-gradient(145deg, #cfe9dd, #9fd3bf);
}
.mock-lines { flex: 1; }
.mock-lines i { display: block; height: 5px; border-radius: 3px; background: #e4ece7; }
.mock-lines i + i { margin-top: 5px; width: 62%; }
.mock-chat {
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 9px;
  background:
    repeating-linear-gradient(45deg, rgba(37,211,102,.03) 0 10px, transparent 10px 20px),
    #fbfdfc;
}
.bubble {
  max-width: 74%;
  font-size: .72rem;
  line-height: 1.5;
  padding: 7px 11px;
  border-radius: 10px;
  color: var(--ink-2);
  box-shadow: 0 1px 1px rgba(0,0,0,.04);
}
.bubble.in { background: #fff; border-bottom-left-radius: 3px; align-self: flex-start; }
.bubble.out { background: #d9fdd3; align-self: flex-end; border-bottom-right-radius: 3px; }
.bubble small { display: block; font-size: .6rem; color: var(--muted); text-align: right; margin-top: 2px; }

/* ---------- 通用区块 ---------- */
.section { padding: 68px 0; }
.section-soft { background: var(--bg-soft); border-block: 1px solid var(--line); }
.section-head { max-width: 720px; margin: 0 auto 40px; text-align: center; }
.section-head p { color: var(--muted); margin-bottom: 0; }
.eyebrow {
  display: inline-block;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--green-dark);
  background: var(--green-soft);
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
}

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px;
  box-shadow: var(--shadow-sm);
  transition: transform .18s, box-shadow .18s, border-color .18s;
  height: 100%;
}
a.card, .card.link { display: block; color: inherit; }
a.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: #d3e6dc;
  color: inherit;
}
.card-icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: var(--green-soft);
  display: grid; place-items: center;
  margin-bottom: 16px;
}
.card-icon svg { width: 22px; height: 22px; stroke: var(--green-dark); }
.card h3 { margin-bottom: 8px; }
.card p { font-size: .93rem; color: var(--muted); margin-bottom: 0; }

/* ---------- 文章正文 ---------- */
.prose { max-width: 800px; margin: 0 auto; }
.prose h2 { margin-top: 2em; padding-top: .2em; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { margin-top: 1.6em; }
.prose img { border-radius: var(--radius-sm); margin: 1.4em 0; }
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: .92rem;
  margin: 1.4em 0;
  overflow: hidden;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
}
.prose th, .prose td { padding: 11px 14px; border-bottom: 1px solid var(--line); text-align: left; }
.prose th { background: var(--bg-soft); color: var(--ink); font-weight: 600; }
.prose tr:last-child td { border-bottom: 0; }
.prose blockquote {
  margin: 1.4em 0;
  padding: 14px 18px;
  background: var(--green-soft);
  border-left: 3px solid var(--green);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--ink-2);
  font-size: .95rem;
}
.prose blockquote p:last-child { margin-bottom: 0; }

/* 面包屑 */
.crumbs { font-size: .85rem; color: var(--muted); padding: 18px 0 0; }
.crumbs a { color: var(--muted); }
.crumbs a:hover { color: var(--green-dark); }
.crumbs span { margin: 0 6px; opacity: .6; }

/* 页头（内页） */
.page-head {
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
  padding: 14px 0 52px;
}
.page-head h1 { max-width: 19em; margin-bottom: 14px; font-size: clamp(1.6rem, 3.2vw, 2.35rem); }
.page-head .lead { font-size: 1.02rem; color: var(--muted); max-width: 46em; margin: 0; }

/* ---------- 步骤条 ---------- */
.steps { counter-reset: step; display: grid; gap: 18px; }
.step {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 18px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  box-shadow: var(--shadow-sm);
}
.step-num {
  width: 40px; height: 40px;
  border-radius: 12px;
  background: linear-gradient(145deg, var(--green), var(--green-dark));
  color: #fff;
  font-weight: 700;
  display: grid; place-items: center;
  font-size: .95rem;
}
.step h3 { margin: 2px 0 6px; }
.step p { margin-bottom: 0; font-size: .94rem; color: var(--muted); }

/* ---------- FAQ ---------- */
.faq { max-width: 820px; margin: 0 auto; }
.faq h2 {
  font-size: 1.22rem;
  margin: 46px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.faq h2:first-of-type { margin-top: 0; }
.faq details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.faq summary {
  cursor: pointer;
  padding: 17px 22px;
  font-weight: 600;
  color: var(--ink);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: .97rem;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-size: 1.3rem;
  font-weight: 400;
  color: var(--green-dark);
  flex: 0 0 auto;
  line-height: 1;
}
.faq details[open] summary::after { content: "–"; }
.faq details[open] summary { border-bottom: 1px solid var(--line); }
.faq .answer { padding: 16px 22px 20px; font-size: .94rem; color: var(--ink-2); }
.faq .answer p:last-child { margin-bottom: 0; }

/* ---------- 表格对比 ---------- */
.table-wrap {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: auto;
  box-shadow: var(--shadow-sm);
  background: #fff;
}
.table-wrap table { width: 100%; border-collapse: collapse; font-size: .93rem; min-width: 560px; }
.table-wrap th, .table-wrap td { padding: 13px 18px; border-bottom: 1px solid var(--line); text-align: left; }
.table-wrap thead th { background: var(--bg-soft); font-weight: 600; color: var(--ink); white-space: nowrap; }
.table-wrap tbody tr:last-child td { border-bottom: 0; }
.tick { color: var(--green-dark); font-weight: 700; }
.cross { color: #b8c4bf; }

/* ---------- 提示条 ---------- */
.note {
  display: flex;
  gap: 14px;
  background: #fffdf5;
  border: 1px solid #f0e3bd;
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  font-size: .92rem;
  color: #6b5a20;
  margin: 1.6em 0;
}
.note svg { width: 20px; height: 20px; flex: 0 0 20px; stroke: #b5852a; margin-top: 2px; }
.note p { margin: 0; }
.note strong { color: #57470f; }

/* ---------- 相关阅读 ---------- */
.related { border-top: 1px solid var(--line); padding-top: 40px; margin-top: 20px; }
.related h2 { font-size: 1.15rem; }
.related ul { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 24px; }
.related li { margin: 0; }
.related a { display: flex; align-items: center; gap: 8px; font-size: .94rem; }
.related a::before { content: "→"; color: var(--green); font-weight: 700; }

/* ---------- CTA ---------- */
.cta {
  background:
    radial-gradient(600px 240px at 88% 0%, rgba(37, 211, 102, .22), transparent 60%),
    linear-gradient(140deg, var(--green-deep), var(--green-dark));
  border-radius: 22px;
  padding: 46px 40px;
  text-align: center;
  color: #dff3ea;
}
.cta h2 { color: #fff; }
.cta p { color: rgba(255, 255, 255, .82); max-width: 40em; margin: 0 auto 24px; }
.cta .btn + .btn { margin-left: 12px; }
.cta .btn-ghost { background: rgba(255, 255, 255, .1); border-color: rgba(255, 255, 255, .35); color: #fff; }
.cta .btn-ghost:hover { background: rgba(255, 255, 255, .18); color: #fff; }
.cta .btn-primary { background: #fff; color: var(--green-deep); box-shadow: 0 6px 20px rgba(0, 0, 0, .16); }
.cta .btn-primary:hover { color: var(--green-deep); }

/* ---------- 页脚 ---------- */
.site-footer {
  background: #0d1f1b;
  color: #9db3ac;
  padding: 54px 0 26px;
  font-size: .9rem;
  margin-top: 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 36px;
  padding-bottom: 34px;
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}
.site-footer .brand { color: #fff; margin-bottom: 12px; }
.site-footer .brand:hover { color: #fff; }
.site-footer p { color: #8ba39c; line-height: 1.7; margin-bottom: 0; font-size: .88rem; }
.footer-col h4 { color: #e8f2ee; font-size: .84rem; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 14px; }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 9px; }
.footer-col a { color: #9db3ac; }
.footer-col a:hover { color: var(--green); }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  padding-top: 22px;
  font-size: .82rem;
  color: #7b928b;
}
.footer-bottom a { color: #7b928b; }
.footer-bottom a:hover { color: var(--green); }

/* ---------- 404 ---------- */
.err {
  min-height: 62vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 80px 20px;
}
.err .code {
  font-size: clamp(4rem, 14vw, 8rem);
  font-weight: 800;
  line-height: 1;
  background: linear-gradient(140deg, var(--green), var(--green-deep));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 8px;
  letter-spacing: -.04em;
}
.err p { color: var(--muted); max-width: 32em; margin: 0 auto 26px; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .qr-card { max-width: 380px; margin: 0 auto; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 760px) {
  .nav-toggle { display: grid; }
  .nav-links {
    position: absolute;
    top: 64px; left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    padding: 10px 16px 18px;
    gap: 2px;
    box-shadow: var(--shadow-md);
    display: none;
  }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 11px 14px; }

  .hero { padding: 48px 0 44px; }
  .section { padding: 48px 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .related ul { grid-template-columns: 1fr; }
  .cta { padding: 34px 22px; border-radius: 18px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .step { grid-template-columns: 36px 1fr; padding: 18px; gap: 14px; }
  .step-num { width: 34px; height: 34px; font-size: .85rem; }
  .page-head { padding-bottom: 38px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}