/* ============================================================
   CodexBuddy 官网 · 白+蓝 — 布局与区块
   产品 mockup 样式见 mockups.css；令牌见 tokens.css
   动效默认态：内容默认可见，html.js 才启用初始隐藏（脚本失败自动回退全可见）
   ============================================================ */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 78px; }
body {
  background: var(--bg-app);
  color: var(--fg-2);
  font: 15px/1.75 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
.mono { font-family: var(--mono); }
.num { font-variant-numeric: tabular-nums; }
.wrap { max-width: var(--w); margin: 0 auto; padding: 0 28px; }
[id] { scroll-margin-top: 78px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.tight { padding-top: 0; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 60;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-1);
}
.nav-in { display: flex; align-items: center; gap: 28px; min-height: 62px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 15.5px; letter-spacing: -0.01em; color: var(--fg-1); white-space: nowrap; }
.logo img { width: 30px; height: 30px; display: block; }
.nav-links { display: flex; gap: 22px; font-size: 13.5px; color: var(--fg-3); }
.nav-links a { transition: color 0.12s; white-space: nowrap; }
.nav-links a:hover { color: var(--fg-1); }
.nav-cta { margin-left: auto; display: flex; align-items: center; gap: 12px; }

/* 窄屏折叠菜单（原生 details，无 JS 依赖） */
.nav-menu { position: relative; display: none; }
.nav-menu summary {
  list-style: none; cursor: pointer; font-size: 13.5px; color: var(--fg-2);
  border: 1px solid var(--border-2); border-radius: var(--r-md); padding: 8px 14px;
  white-space: nowrap; background: #fff;
}
.nav-menu summary::-webkit-details-marker { display: none; }
.nav-menu[open] summary { background: var(--bg-hover); }
.nav-menu-list {
  position: absolute; right: 0; top: calc(100% + 8px); z-index: 70;
  display: grid; gap: 2px; min-width: 180px; padding: 8px;
  background: #fff; border: 1px solid var(--border-1); border-radius: var(--r-lg);
  box-shadow: var(--shadow-4);
}
.nav-menu-list a { font-size: 13.5px; color: var(--fg-2); padding: 9px 12px; border-radius: var(--r-md); white-space: nowrap; }
.nav-menu-list a:hover { background: var(--bg-hover); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: var(--r-md); font-weight: 600; cursor: pointer; white-space: nowrap;
  border: 1px solid transparent; font-size: 14px; padding: 9px 18px;
  transition: background 0.12s, border-color 0.12s, color 0.12s, box-shadow 0.2s, transform 0.16s var(--ease-out);
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: var(--shadow-1); }
.btn-primary:hover { background: var(--accent-hover); box-shadow: var(--shadow-2); }
.btn-primary:active { background: var(--accent-press); }
.btn-ghost { border-color: var(--border-2); color: var(--fg-2); background: #fff; }
.btn-ghost:hover { border-color: var(--border-3); background: var(--bg-hover); }
.btn-lg { padding: 13px 26px; font-size: 15px; border-radius: 10px; }

/* ---------- pill（admin 口径：soft 底 + 深字 + dot） ---------- */
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  font: 600 11.5px/1 var(--sans); padding: 4px 10px; border-radius: 5px;
}
.pill i { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.pill-ok { background: var(--ok-soft); color: var(--ok-deep); }
.pill-warn { background: var(--warn-soft); color: var(--warn-deep); }
.pill-danger { background: var(--danger-soft); color: var(--danger-deep); }
.pill-info { background: var(--info-soft); color: var(--info-deep); }
.pill-blue { background: var(--accent-soft); color: var(--accent); }
.pill-wechat { background: rgba(7, 193, 96, 0.12); color: var(--wechat-deep); }

/* ---------- Hero ---------- */
.hero {
  position: relative; text-align: center; padding: 88px 0 30px;
  background:
    radial-gradient(90% 60% at 50% -20%, var(--accent-soft), transparent 70%),
    linear-gradient(180deg, #fdfdfe, var(--bg-app) 60%);
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font: 600 11.5px/1 var(--mono); letter-spacing: 0.12em;
  color: var(--accent);
  background: #fff; border: 1px solid var(--border-1); border-radius: var(--r-pill);
  padding: 7px 14px; box-shadow: var(--shadow-1);
}
.eyebrow img { width: 15px; height: 15px; }
h1 {
  font-size: var(--text-hero); line-height: 1.12; letter-spacing: -0.04em;
  font-weight: 700; color: var(--fg-1); margin: 24px auto 18px; max-width: 13em;
  text-wrap: balance;
}
/* 品牌行：icon + CodexBuddy 渐变字（与 App 图标同一蓝紫系） */
.brand-line {
  display: flex; align-items: center; justify-content: center; gap: 0.18em;
  letter-spacing: -0.035em;
  background: var(--brand-grad);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.brand-line img { width: 0.94em; height: 0.94em; flex: none; }
.slogan { display: block; font-size: 0.6em; letter-spacing: -0.03em; color: var(--fg-1); margin-top: 0.3em; }
h1 .accent { color: var(--accent); display: inline-block; }
.hero-sub { color: var(--fg-3); font-size: clamp(15px, 1.4vw, 17px); max-width: 36em; margin: 0 auto; text-wrap: balance; }
.hero-sub b { color: var(--fg-1); font-weight: 600; }
.hero-ctas { display: flex; gap: 12px; justify-content: center; margin: 32px 0 14px; flex-wrap: wrap; }
.hero-meta { font: 500 12px/1.7 var(--mono); color: var(--fg-4); }

/* 载入编排基元（默认可见；html.js 且未 loaded 时才隐藏） */
.fade { transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out); }
html.js body:not(.loaded) .fade { opacity: 0; transform: translateY(14px); }

/* ---------- 分区通用 ---------- */
section { padding: 92px 0; }
.sec-head { max-width: 38em; margin-bottom: 46px; }
.sec-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.sec-eyebrow { font: 600 11px/1 var(--mono); letter-spacing: 0.16em; color: var(--accent); text-transform: uppercase; }
h2 { font-size: var(--text-h2); letter-spacing: -0.03em; line-height: 1.22; font-weight: 700; color: var(--fg-1); margin: 13px 0 11px; text-wrap: balance; }
.sec-sub { color: var(--fg-3); font-size: 15px; max-width: 42em; }
.sec-head.center .sec-sub { margin: 0 auto; }
.reveal { transition: opacity 0.55s var(--ease-out), transform 0.55s var(--ease-out); }
html.js .reveal:not(.in) { opacity: 0; transform: translateY(16px); }

/* 卡片公式（admin 同源：白底 + 发丝线 + r12 + 极轻阴影） */
.card { background: #fff; border: 1px solid var(--border-1); border-radius: var(--r-lg); box-shadow: var(--shadow-1); }

/* ---------- 亮点① 官方渠道对比 ---------- */
.compare-sec { background: var(--bg-panel); border-block: 1px solid var(--border-1); }
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; align-items: stretch; }
.lane { padding: 26px 26px 24px; position: relative; }
.lane-bad { background: var(--danger-bg-subtle); border: 1px solid var(--danger-border-subtle); border-radius: var(--r-lg); }
.lane-good { background: #fff; border: 1px solid rgba(30, 95, 224, 0.35); border-radius: var(--r-lg); box-shadow: 0 0 0 1px rgba(30, 95, 224, 0.10), var(--shadow-3); }
.lane-tag { display: inline-flex; font: 600 11px/1 var(--sans); letter-spacing: 0.05em; padding: 5px 11px; border-radius: 5px; margin-bottom: 18px; }
.lane-bad .lane-tag { background: var(--danger-soft); color: var(--danger-deep); }
.lane-good .lane-tag { background: var(--accent-soft); color: var(--accent); }
.lane h3 { font-size: 17px; font-weight: 600; color: var(--fg-1); margin-bottom: 16px; letter-spacing: -0.01em; }
.risk-list { list-style: none; display: grid; gap: 11px; margin-top: 20px; }
.risk-list li { display: flex; gap: 10px; align-items: flex-start; font-size: 13.5px; color: var(--fg-3); }
.risk-list .ic { flex: none; width: 18px; height: 18px; border-radius: 50%; display: grid; place-items: center; font: 700 11px/1 var(--mono); margin-top: 2px; }
.lane-bad .ic { background: var(--danger-soft); color: var(--danger); }
.lane-good .ic { background: var(--ok-soft); color: var(--ok); }
.lane-bad b, .lane-good b { color: var(--fg-1); font-weight: 600; }

/* ---------- 亮点② 免注册步骤 ---------- */
.steps-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 22px; align-items: center; }
.steps-col { padding: 26px; }
.steps-col h3 { font-size: 16px; font-weight: 600; color: var(--fg-1); margin-bottom: 18px; }
.step-list { list-style: none; display: grid; gap: 13px; }
.step-list li { display: flex; gap: 12px; align-items: flex-start; font-size: 13.5px; color: var(--fg-3); }
.step-list .n {
  flex: none; font: 600 11px/1 var(--mono); color: var(--fg-4);
  border: 1px solid var(--border-2); border-radius: var(--r-sm); padding: 6px 7px; margin-top: 1px;
}
.steps-col.old li .strike { text-decoration: line-through; text-decoration-color: rgba(220, 38, 38, 0.5); }
.steps-foot { margin-top: 18px; font-size: 12.5px; color: var(--fg-4); }

/* ---------- 亮点③ 供应商 ---------- */
.providers-sec { background: var(--bg-panel); border-block: 1px solid var(--border-1); }
.prov-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 34px; align-items: center; }
.prov-chips { display: flex; flex-wrap: wrap; gap: 9px; margin: 20px 0 22px; }
.chip {
  font: 600 12.5px/1 var(--sans); padding: 8px 14px; border-radius: var(--r-pill);
  background: #fff; border: 1px solid var(--border-2); color: var(--fg-2); box-shadow: var(--shadow-1);
}
.chip-more { color: var(--fg-4); border-style: dashed; box-shadow: none; }
.prov-points { list-style: none; display: grid; gap: 10px; }
.prov-points li { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; color: var(--fg-3); }
.prov-points .ic { flex: none; width: 18px; height: 18px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; font: 700 11px/1 var(--mono); margin-top: 3px; }
.prov-points b { color: var(--fg-1); font-weight: 600; }

/* ---------- 亮点④ 功能交替行 ---------- */
.feature-row { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 44px; align-items: center; }
.feature-row + .feature-row { margin-top: 84px; }
.feature-row.flip .f-copy { order: 2; }
.feature-row.flip .f-visual { order: 1; }
.f-kicker { font: 600 11px/1 var(--mono); letter-spacing: 0.14em; color: var(--accent); text-transform: uppercase; }
.f-copy h3 { font-size: clamp(19px, 2vw, 24px); font-weight: 700; color: var(--fg-1); letter-spacing: -0.02em; margin: 12px 0 10px; }
.f-copy p { font-size: 14.5px; color: var(--fg-3); }
.f-points { list-style: none; display: grid; gap: 9px; margin-top: 16px; }
.f-points li { display: flex; gap: 10px; align-items: flex-start; font-size: 13.5px; color: var(--fg-3); }
.f-points .ic { flex: none; width: 17px; height: 17px; border-radius: 50%; background: var(--ok-soft); color: var(--ok); display: grid; place-items: center; font: 700 10px/1 var(--mono); margin-top: 3px; }
.f-points b { color: var(--fg-1); font-weight: 600; }

/* ---------- 套餐 ---------- */
.plans-sec { background: var(--bg-panel); border-block: 1px solid var(--border-1); }
.plan-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; align-items: stretch; }
.plan { background: #fff; border: 1px solid var(--border-1); border-radius: var(--r-xl); padding: 28px; display: flex; flex-direction: column; position: relative; box-shadow: var(--shadow-1); transition: box-shadow 0.2s, transform 0.25s var(--ease-out); }
.plan:hover { box-shadow: var(--shadow-3); transform: translateY(-2px); }
.plan.hot { border-color: rgba(30, 95, 224, 0.45); box-shadow: 0 0 0 1px rgba(30, 95, 224, 0.12), var(--shadow-3); }
.plan.hot::before {
  content: "多数人选择"; position: absolute; top: -12px; left: 24px;
  background: var(--accent); color: #fff; font: 600 11px/1 var(--sans);
  padding: 6px 12px; border-radius: var(--r-pill); box-shadow: var(--shadow-2);
}
.plan h3 { font-size: 15.5px; font-weight: 600; color: var(--fg-1); }
.plan .tagline { font-size: 12.5px; color: var(--fg-4); margin-top: 4px; }
.price { margin: 18px 0 6px; display: flex; align-items: baseline; gap: 6px; }
.price b { font: 700 34px/1 var(--mono); letter-spacing: -0.03em; color: var(--fg-1); font-variant-numeric: tabular-nums; }
.price .unit { color: var(--fg-3); font-size: 13px; }
.plan ul { list-style: none; margin: 14px 0 24px; display: grid; gap: 10px; font-size: 13.5px; color: var(--fg-3); }
.plan li { display: flex; gap: 9px; align-items: flex-start; }
.plan li::before {
  content: ""; flex: none; width: 14px; height: 14px; margin-top: 4px; background: var(--ok);
  mask: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="black" stroke-width="3" stroke-linecap="round" stroke-linejoin="round"><path d="M20 6 9 17l-5-5"/></svg>') center/contain no-repeat;
}
.plan .btn { margin-top: auto; }
.plan-note { margin-top: 18px; font: 500 12px/1.7 var(--mono); color: var(--fg-4); }
.pay-badges { display: flex; gap: 8px; margin-top: 20px; }

/* ---------- 安装 ---------- */
.install-card { max-width: 780px; margin: 0 auto; padding: 30px 32px; }
.install-card ol { list-style: none; counter-reset: step; display: grid; gap: 16px; margin-top: 6px; }
.install-card li { counter-increment: step; display: flex; gap: 16px; align-items: flex-start; font-size: 14px; color: var(--fg-3); }
.install-card li::before {
  content: counter(step, decimal-leading-zero); flex: none;
  font: 600 12px/1 var(--mono); color: var(--accent);
  border: 1px solid rgba(30, 95, 224, 0.3); border-radius: var(--r-md);
  padding: 7px 8px; margin-top: 1px; background: var(--accent-soft);
}
.install-card b { color: var(--fg-1); font-weight: 600; }
.install-card code {
  font: 500 12px/1.6 var(--mono); color: var(--accent-press);
  background: var(--accent-soft); border: 1px solid rgba(30, 95, 224, 0.18);
  border-radius: var(--r-sm); padding: 2px 7px;
}
.install-note { margin-top: 18px; font-size: 12.5px; color: var(--fg-4); line-height: 1.7; }

/* ---------- 安全条 ---------- */
.trust { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.trust-item { display: flex; gap: 14px; align-items: flex-start; padding: 22px; }
.trust-item svg { flex: none; width: 19px; height: 19px; stroke: var(--accent); stroke-width: 1.7; fill: none; stroke-linecap: round; stroke-linejoin: round; margin-top: 2px; }
.trust-item b { display: block; font-size: 14px; font-weight: 600; margin-bottom: 4px; color: var(--fg-1); }
.trust-item span { font-size: 13px; color: var(--fg-3); }

/* ---------- FAQ（桌面两栏：左标题右列表） ---------- */
.faq-grid { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); gap: 48px; align-items: start; }
.faq-grid .sec-head { margin-bottom: 0; }
.faq details { border-bottom: 1px solid var(--border-1); }
.faq details:first-child { border-top: 1px solid var(--border-1); }
.faq summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 18px 2px; font-size: 15px; font-weight: 600; color: var(--fg-1); transition: color 0.12s; }
.faq summary:hover { color: var(--accent); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+" / ""; font: 300 21px/1 var(--mono); color: var(--fg-4); transition: transform 0.25s var(--ease-out); flex: none; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq .a { padding: 0 2px 19px; color: var(--fg-3); font-size: 14px; max-width: 46em; }
.faq .a a { color: var(--accent); }

/* ---------- CTA ---------- */
.cta-final { text-align: center; padding: 104px 0 96px; background: linear-gradient(180deg, var(--bg-app), var(--accent-soft) 160%); }
.cta-final img { width: 64px; height: 64px; margin-bottom: 18px; }
.cta-final .hero-ctas { margin-top: 28px; }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--border-1); padding: 30px 0 42px; background: var(--bg-panel); }
.foot-in { display: flex; align-items: center; gap: 20px; font-size: 12.5px; color: var(--fg-4); flex-wrap: wrap; }
.foot-in a:hover { color: var(--fg-1); }
.foot-right { margin-left: auto; display: flex; gap: 18px; align-items: center; }

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  .nav-links { display: none; }
  .nav-menu { display: block; }
}
@media (max-width: 960px) {
  .compare, .steps-grid { grid-template-columns: 1fr; }
  .prov-grid, .feature-row { grid-template-columns: 1fr; gap: 30px; }
  .feature-row.flip .f-copy { order: 1; }
  .feature-row.flip .f-visual { order: 2; }
  .plan-grid, .trust { grid-template-columns: 1fr 1fr; }
  .feature-row + .feature-row { margin-top: 64px; }
  .faq-grid { grid-template-columns: 1fr; gap: 26px; }
}
@media (max-width: 640px) {
  .nav-in { gap: 12px; padding: 0; }
  .nav .wrap { padding: 0 16px; }
  .logo { font-size: 14.5px; gap: 8px; }
  .logo img { width: 26px; height: 26px; }
  .nav-menu summary { padding: 7px 11px; font-size: 13px; }
  .nav-cta { gap: 8px; }
  .nav-cta > .btn { padding: 8px 12px; font-size: 13px; }
  .hero { padding: 58px 0 22px; }
  section { padding: 66px 0; }
  .plan-grid, .trust { grid-template-columns: 1fr; }
  .install-card { padding: 24px 20px; }
  .install-card code { word-break: break-all; }
  .cta-final { padding: 78px 0 70px; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
  html.js .fade, html.js .reveal:not(.in) { opacity: 1 !important; transform: none !important; }
}