:root {
  --text: #0f172a;
  --muted: #64748b;
  --primary: #2563eb;
  --teal: #06b6d4;
  --border: #e6e9f1;
  --bg: #ffffff;
  --bg-soft: #f4f6fa;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Inter, sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: var(--bg);
}
a { text-decoration: none; color: inherit; }
/* .hidden 必须在这里定义：landing 不引用 style.css，而页面里多处用 class="... hidden"
   （购买按钮的显隐、样张放大层）。少了它，放大层会在打开页面时就盖在首页上 —— 真出过这个事故。
   [hidden] 也一并兜住：author 的 display:flex 会盖掉浏览器对 hidden 属性的默认 display:none。 */
.hidden, [hidden] { display: none !important; }

/* Nav */
.nav { position: sticky; top: 0; background: #fff; border-bottom: 1px solid var(--border); z-index: 10; }
.nav-inner { max-width: 1000px; margin: 0 auto; padding: 14px 20px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-name { font-weight: 700; font-size: 16px; }
.nav-actions { display: flex; gap: 10px; }

/* Buttons */
.btn-primary {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 18px; border-radius: 10px; font-weight: 600; font-size: 14px;
  background: linear-gradient(135deg, #06b6d4 0%, #2563eb 100%); color: #fff;
  box-shadow: 0 4px 14px rgba(37,99,235,0.28); border: none; cursor: pointer;
}
.btn-primary:hover { box-shadow: 0 6px 18px rgba(37,99,235,0.34); }
.btn-ghost {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 18px; border-radius: 10px; font-weight: 600; font-size: 14px;
  background: #fff; color: var(--text); border: 1px solid var(--border); cursor: pointer;
}
.btn-ghost:hover { background: #f1f5f9; }
.btn-lg { padding: 13px 24px; font-size: 15px; }

/* Hero */
.hero { background: linear-gradient(120deg, #0b1220 0%, #16233f 55%, #1e293b 100%); color: #fff; }
.hero-inner { max-width: 820px; margin: 0 auto; padding: 80px 20px; text-align: center; }
.hero h1 { font-size: 42px; line-height: 1.15; margin: 0 0 18px; letter-spacing: -0.02em; }
.grad { background: linear-gradient(90deg, #22d3ee, #60a5fa); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero .sub { font-size: 18px; color: #cbd5e1; max-width: 620px; margin: 0 auto 28px; }
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-cta .btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,0.35); }
.hero-cta .btn-ghost:hover { background: rgba(255,255,255,0.08); }
.micro { margin-top: 18px; color: #94a3b8; font-size: 13px; }

/* Sections */
section { padding: 64px 20px; }
h2 { font-size: 30px; margin: 0 0 12px; text-align: center; letter-spacing: -0.01em; }
.sec-sub { text-align: center; color: var(--muted); margin: 0 0 36px; }

/* Features */
.features { background: var(--bg-soft); }
.features { display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; max-width: 1000px; margin: 0 auto; }
.feature { flex: 1 1 260px; max-width: 320px; background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 28px 24px; box-shadow: 0 1px 2px rgba(15,23,42,0.04), 0 8px 24px rgba(15,23,42,0.06); }
.f-icon { font-size: 28px; }
.feature h3 { margin: 12px 0 8px; font-size: 17px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; }

/* How it works */
.how .steps { display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; max-width: 900px; margin: 0 auto; }
.step { flex: 1 1 220px; max-width: 280px; text-align: center; }
.step .n { display: inline-flex; width: 40px; height: 40px; border-radius: 50%; align-items: center; justify-content: center; background: linear-gradient(135deg, #06b6d4, #2563eb); color: #fff; font-weight: 700; font-size: 18px; }
.step h3 { margin: 14px 0 6px; font-size: 17px; }
.step p { margin: 0; color: var(--muted); font-size: 14px; }

/* Sample reports（真机渲染的模板样张：9 种模板各一张） */
.samples { background: var(--bg-soft); scroll-margin-top: 74px; }
.sample-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; max-width: 1000px; margin: 0 auto; }
.sample-card {
  display: flex; flex-direction: column; background: #fff; border: 1px solid var(--border);
  border-radius: 14px; overflow: hidden; box-shadow: 0 1px 2px rgba(15,23,42,0.04), 0 10px 26px rgba(15,23,42,0.07);
  transition: transform .12s ease, box-shadow .15s ease;
}
.sample-card:hover { transform: translateY(-2px); box-shadow: 0 2px 4px rgba(15,23,42,0.06), 0 14px 34px rgba(15,23,42,0.12); }
/* 固定比例 + 顶部对齐：9 张图长短不一，卡片高度才会齐。
   height:auto 必须写：img 上的 height="1150" 属性会当成 height:1150px 生效，
   那样 aspect-ratio 就不起作用了 —— 盒子被撑成 320x1150，cover 只好横向裁掉左右两边
   （实际出现过：报告页左右被切掉、文字从半句开始）。 */
.sample-card img {
  display: block; width: 100%; height: auto; aspect-ratio: 4 / 5;
  object-fit: cover; object-position: top center;
  border-bottom: 1px solid var(--border); background: #fff;
}
.sample-meta { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 3px; }
.sample-meta strong { font-size: 14px; }
.sample-meta span { color: var(--muted); font-size: 12.5px; line-height: 1.45; }
.sample-note { text-align: center; color: var(--muted); font-size: 14px; margin: 30px auto 0; max-width: 720px; }
.sample-cta { display: flex; justify-content: center; margin-top: 22px; }
/* 点样张 = 就地放大（不是跳走）：卡片给放大镜光标 */
.sample-card { cursor: zoom-in; }
.sample-card:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; }

/* 样张放大层 */
body.sample-open { overflow: hidden; }
.sample-box { position: fixed; inset: 0; z-index: 50; background: rgba(8,13,26,0.94); display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 24px; }
.sample-box-stage { position: relative; flex: 0 1 auto; min-height: 0; display: flex; }
.sample-box-stage img {
  display: block; max-width: min(92vw, 680px); max-height: 76vh; width: auto; height: auto;
  background: #fff; border-radius: 8px; box-shadow: 0 24px 60px rgba(0,0,0,0.45);
}
.sample-box-x { position: absolute; top: -14px; right: -14px; width: 36px; height: 36px; border-radius: 50%; border: none; background: #fff; color: var(--text); font-size: 16px; font-weight: 700; cursor: pointer; box-shadow: 0 4px 14px rgba(0,0,0,0.3); }
.sample-box-x:hover { background: #f1f5f9; }
.sample-box-nav {
  position: absolute; top: 50%; transform: translateY(-50%); width: 42px; height: 42px; border-radius: 50%;
  border: none; background: rgba(255,255,255,0.92); color: var(--text); font-size: 24px; line-height: 1; cursor: pointer;
  box-shadow: 0 4px 14px rgba(0,0,0,0.3);
}
.sample-box-nav:hover { background: #fff; }
.sample-box-nav.prev { left: -20px; }
.sample-box-nav.next { right: -20px; }
.sample-box-bar { display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap; max-width: min(92vw, 680px); width: 100%; margin-top: 16px; color: #e2e8f0; }
.sample-box-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.sample-box-text strong { color: #fff; font-size: 15px; }
.sample-box-text span { color: #94a3b8; font-size: 12.5px; }
.sample-box-actions { display: flex; gap: 10px; flex-shrink: 0; }
.sample-box-actions .btn-ghost { background: transparent; color: #e2e8f0; border-color: rgba(255,255,255,0.35); }
.sample-box-actions .btn-ghost:hover { background: rgba(255,255,255,0.1); }

/* 内容页（sample-report / sewer-defect-codes）：长文阅读宽度，表格与列表按文档感排版 */
.doc-page { max-width: 860px; margin: 0 auto; padding: 40px 20px 20px; }
.doc-page h1 { font-size: 34px; line-height: 1.15; margin: 6px 0 14px; letter-spacing: -0.02em; text-align: left; }
.doc-page h2 { font-size: 22px; text-align: left; margin: 34px 0 10px; }
.doc-page p { color: #334155; }
.doc-page .lede { font-size: 17px; color: #334155; }
/* 正文里的**行内链接**用主题蓝。必须显式排除组件：按钮（.btn-*）和样张卡片（.sample-card）
   都有自己的配色，而这条规则的优先级高于 .btn-primary ——
   之前写成 `.doc-page a { color: var(--primary) }`，把按钮文字染成"蓝底蓝字"（几乎看不见），
   也把样张卡片的标题染成了蓝色。 */
.doc-page a:not(.btn-primary):not(.btn-ghost):not(.btn-lg):not(.sample-card) { color: var(--primary); }
.crumbs { font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.crumbs a { color: var(--muted); }
.doc-cta { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin: 22px 0 8px; }
.doc-cta .micro { color: var(--muted); font-size: 13px; }
.doc-list { padding-left: 22px; margin: 12px 0; }
.doc-list li { margin: 8px 0; color: #334155; }
.doc-table { width: 100%; border-collapse: collapse; margin: 14px 0 6px; font-size: 14px; }
.doc-table th, .doc-table td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
.doc-table th { background: var(--bg-soft); font-size: 13px; }
.doc-table code { background: #f1f5f9; border-radius: 4px; padding: 1px 5px; font-size: 13px; }
.doc-note { color: var(--muted); font-size: 13.5px; margin: 4px 0 0; }
.doc-page details { border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; margin-bottom: 10px; }
.doc-page summary { cursor: pointer; font-weight: 600; }
.doc-page details p { margin: 10px 0 0; color: var(--muted); font-size: 14px; }

/* Pricing */
.price-grid { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; max-width: 960px; margin: 0 auto; }
.price-card { flex: 1 1 260px; max-width: 300px; background: #fff; border: 1px solid var(--border); border-radius: 16px; padding: 28px 24px; display: flex; flex-direction: column; gap: 14px; position: relative; }
.price-card.featured { border: 2px solid var(--primary); box-shadow: 0 8px 28px rgba(37,99,235,0.16); }
.tag { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--primary); color: #fff; font-size: 11px; font-weight: 700; padding: 3px 12px; border-radius: 999px; }
.price-card h3 { margin: 0; font-size: 17px; }
.price { font-size: 38px; font-weight: 800; letter-spacing: -0.02em; }
.price span { font-size: 15px; font-weight: 500; color: var(--muted); }
.price-card ul { list-style: none; padding: 0; margin: 0; flex: 1; }
.price-card li { padding: 6px 0 6px 24px; position: relative; color: var(--muted); font-size: 14px; }
.price-card li::before { content: "✓"; position: absolute; left: 0; color: #10b981; font-weight: 700; }
.price-card .btn-primary, .price-card .btn-ghost { justify-content: center; width: 100%; }

/* FAQ */
.faq { max-width: 700px; margin: 0 auto; }
.faq details { border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px; margin-bottom: 10px; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq details p { margin: 10px 0 0; color: var(--muted); font-size: 14px; }

/* Contact */
.contact { background: var(--bg-soft); text-align: center; }
.contact-email { display: inline-block; margin-top: 10px; font-size: 20px; font-weight: 700; color: var(--primary); }

/* Footer */
footer { background: #0b1220; color: #94a3b8; padding: 28px 20px; text-align: center; font-size: 13px; }
footer a { color: #cbd5e1; }
footer p { margin: 4px 0; }

@media (max-width: 900px) {
  .sample-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
}
@media (max-width: 640px) {
  .hero h1 { font-size: 30px; }
  .hero .sub { font-size: 16px; }
  .features { flex-direction: column; align-items: center; }
  /* 手机上顶栏塞不下四个按钮：把两个信息型入口（样张/编码表）收起，保留 Sign in 与 Buy Pro —— 它们在页脚里还有 */
  .nav-actions .nav-info { display: none; }
  .sample-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
  .sample-meta { padding: 11px 12px 13px; }
  .sample-meta strong { font-size: 13px; }
  .sample-meta span { font-size: 11.5px; }
  /* 放大层在手机上：图占满宽，翻页箭头压到画面上，CTA 全宽 */
  .sample-box { padding: 14px; }
  .sample-box-stage img { max-width: 100%; max-height: 62vh; }
  .sample-box-nav { width: 36px; height: 36px; background: rgba(255,255,255,0.85); }
  .sample-box-nav.prev { left: 4px; }
  .sample-box-nav.next { right: 4px; }
  .sample-box-x { top: -10px; right: -6px; }
  .sample-box-bar { flex-direction: column; align-items: stretch; gap: 12px; }
  .sample-box-actions { flex-direction: column; }
  .sample-box-actions .btn-ghost, .sample-box-actions .btn-primary { justify-content: center; }
}