/* ==========================================================
   LBW API 评测中心 · 设计系统
   白色为主 / 细线 / 大留白 / 近黑标题 / 克制强调色
   ========================================================== */

:root {
  --ink: #0a0a0b;
  --ink-2: #27272a;
  --ink-3: #3f3f46;
  --muted: #71717a;
  --muted-2: #a1a1aa;
  --line: #e9e9ee;
  --line-2: #f2f2f5;
  --surface: #ffffff;
  --surface-2: #fafafa;
  --accent: #4f46e5;
  --accent-2: #6366f1;
  --accent-soft: #eef2ff;
  --ok: #059669;
  --warn: #d97706;
  --radius: 16px;
  --shadow-sm: 0 1px 2px rgba(9, 9, 11, .04);
  --shadow: 0 8px 30px -12px rgba(9, 9, 11, .12);
  --shadow-lg: 0 24px 60px -24px rgba(9, 9, 11, .18);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection { background: #ddd6fe; }

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

/* ---------- 布局 ---------- */
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
.wrap-narrow { max-width: 840px; margin: 0 auto; padding: 0 24px; }

/* ---------- 头部 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .86);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: 36px; height: 72px; }

.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.brand-mark {
  width: 32px; height: 32px; border-radius: 9px; background: var(--ink); color: #fff;
  display: grid; place-items: center; font-size: 14px; font-weight: 800; letter-spacing: -.02em;
  flex-shrink: 0;
}
.brand-text { font-size: 16px; font-weight: 700; letter-spacing: -.02em; white-space: nowrap; }
.brand-text em {
  font-style: normal; font-weight: 500; color: var(--muted-2);
  font-size: 11.5px; margin-left: 7px; letter-spacing: .06em;
}

.nav { display: flex; align-items: center; gap: 30px; margin-right: auto; }
.nav a {
  color: var(--muted); text-decoration: none; font-size: 14.5px; font-weight: 500;
  transition: color .18s; white-space: nowrap;
}
.nav a:hover { color: var(--ink); }
.nav a.active { color: var(--ink); font-weight: 600; }

.header-actions { display: flex; align-items: center; gap: 12px; }
.menu-btn {
  display: none; width: 40px; height: 40px; border: 1px solid var(--line); border-radius: 10px;
  background: #fff; color: var(--ink-2); font-size: 17px; cursor: pointer;
}
.mobile-menu {
  display: none; border-top: 1px solid var(--line); background: #fff; padding: 10px 24px 16px;
}
.mobile-menu.open { display: block; }
.mobile-menu a {
  display: block; padding: 10px 0; color: var(--ink-2); text-decoration: none;
  font-size: 15px; border-bottom: 1px solid var(--line-2);
}
.mobile-menu a:last-child { border-bottom: 0; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 44px; padding: 0 22px; border-radius: 10px;
  font-size: 14.5px; font-weight: 600; text-decoration: none;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: background .2s, border-color .2s, transform .2s, box-shadow .2s, color .2s;
  font-family: inherit;
}
.btn-dark { background: var(--ink); color: #fff; }
.btn-dark:hover { background: #27272a; transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-light { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-light:hover { border-color: #d4d4d8; background: var(--surface-2); }
.btn-accent { background: var(--accent); color: #fff; }
.btn-accent:hover { background: #4338ca; transform: translateY(-1px); box-shadow: 0 12px 24px -12px rgba(79,70,229,.6); }
.btn-sm { height: 38px; padding: 0 16px; font-size: 13.5px; border-radius: 9px; }
.btn-lg { height: 50px; padding: 0 28px; font-size: 15.5px; border-radius: 12px; }
.btn-block { width: 100%; }

/* ---------- Hero ---------- */
.hero {
  position: relative; padding: 100px 0 92px; border-bottom: 1px solid var(--line);
  overflow: hidden; background: #fff;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(circle at 1px 1px, #e4e4e7 1px, transparent 0);
  background-size: 26px 26px;
  -webkit-mask-image: radial-gradient(ellipse 72% 62% at 50% 0%, #000 38%, transparent 100%);
  mask-image: radial-gradient(ellipse 72% 62% at 50% 0%, #000 38%, transparent 100%);
  opacity: .6; pointer-events: none;
}
.hero::after {
  content: ""; position: absolute; top: -32%; left: 50%; transform: translateX(-50%);
  width: 920px; height: 620px;
  background: radial-gradient(circle, rgba(79, 70, 229, .075), transparent 66%);
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; text-align: center; max-width: 900px; margin: 0 auto; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; height: 32px; padding: 0 14px;
  border: 1px solid var(--line); border-radius: 999px; background: #fff;
  font-size: 12.5px; font-weight: 500; color: var(--ink-3); letter-spacing: .01em;
  box-shadow: var(--shadow-sm);
}
.eyebrow .dot {
  width: 6px; height: 6px; border-radius: 50%; background: var(--ok);
  box-shadow: 0 0 0 3px rgba(5, 150, 105, .12);
}

.hero h1 {
  font-size: clamp(2.1rem, 5.2vw, 3.6rem); line-height: 1.12;
  letter-spacing: -.038em; font-weight: 800; margin: 24px 0 0; color: var(--ink);
}
.hero h1 .accent { color: var(--accent); }
.hero-sub {
  margin: 22px auto 0; max-width: 640px; color: var(--muted);
  font-size: 17px; line-height: 1.78;
}
.hero-sub strong { color: var(--ink-2); font-weight: 600; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 34px; }
.hero-note { margin-top: 18px; font-size: 12.5px; color: var(--muted-2); letter-spacing: .01em; }

/* ---------- 数据条 ---------- */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  background: #fff;
}
.stats > div { padding: 28px 12px; text-align: center; border-right: 1px solid var(--line); }
.stats > div:last-child { border-right: 0; }
.stat-num { font-size: 28px; font-weight: 800; letter-spacing: -.035em; color: var(--ink); line-height: 1.2; }
.stat-num .u { font-size: 15px; font-weight: 600; color: var(--muted-2); margin-left: 2px; }
.stat-label { font-size: 12.5px; color: var(--muted); margin-top: 4px; }

/* ---------- 区块 ---------- */
.section { padding: 92px 0; }
.section-alt { background: var(--surface-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-dark { background: var(--ink); color: #fff; }
.section-head { max-width: 660px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.label {
  font-size: 11.5px; font-weight: 700; letter-spacing: .15em; text-transform: uppercase;
  color: var(--accent); display: block;
}
.section-dark .label { color: #a5b4fc; }
.section h2 {
  font-size: clamp(1.5rem, 3vw, 2.15rem); letter-spacing: -.032em;
  font-weight: 800; margin: 10px 0 0; line-height: 1.26; color: var(--ink);
}
.section-dark h2 { color: #fff; }
.section-desc { color: var(--muted); margin-top: 14px; font-size: 15.5px; line-height: 1.78; }
.section-dark .section-desc { color: #a1a1aa; }
.section-head-row {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: 24px; flex-wrap: wrap; margin-bottom: 40px;
}
.section-head-row .section-head { margin-bottom: 0; }

/* ---------- 卡片 ---------- */
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; transition: border-color .2s, box-shadow .2s, transform .2s;
}
.card:hover { border-color: #dcdce3; box-shadow: var(--shadow); transform: translateY(-2px); }
.card-flat:hover { transform: none; }
.card-title { font-size: 16.5px; font-weight: 700; letter-spacing: -.015em; color: var(--ink); margin: 0 0 6px; }
.card-text { font-size: 14px; color: var(--muted); line-height: 1.72; margin: 0; }

.icon-box {
  width: 44px; height: 44px; border-radius: 12px; background: var(--surface-2);
  border: 1px solid var(--line); display: grid; place-items: center;
  font-size: 17px; color: var(--ink-2); margin-bottom: 18px;
}
.icon-box.accent { background: var(--accent-soft); border-color: #ddd6fe; color: var(--accent); }

/* ---------- 排名表 ---------- */
.rank-table { width: 100%; border-collapse: separate; border-spacing: 0; font-size: 14.5px; }
.rank-table th {
  text-align: left; font-weight: 500; color: var(--muted); font-size: 12px;
  letter-spacing: .05em; padding: 14px 16px; border-bottom: 1px solid var(--line);
  white-space: nowrap; background: var(--surface-2);
}
.rank-table td { padding: 18px 16px; border-bottom: 1px solid var(--line-2); vertical-align: middle; white-space: nowrap; }
.rank-table tbody tr:last-child td { border-bottom: 0; }
.rank-table tbody tr:hover { background: #fcfcfd; }
.rank-table tr.top { background: #fbfbff; }
.rank-table tr.top:hover { background: #f7f7ff; }

.rank {
  width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center;
  font-weight: 800; font-size: 13px; border: 1px solid var(--line);
  color: var(--ink-3); background: #fff; letter-spacing: -.02em;
}
.rank-1 { background: var(--ink); color: #fff; border-color: var(--ink); }

.score { font-variant-numeric: tabular-nums; color: var(--ink-2); font-weight: 500; }
.score-hi { color: var(--ok); font-weight: 700; }
.score-total { font-weight: 800; color: var(--accent); font-size: 15.5px; }

/* ---------- 评分条 ---------- */
.bar { height: 6px; border-radius: 999px; background: #f1f1f4; overflow: hidden; }
.bar > i { display: block; height: 100%; border-radius: 999px; background: var(--ink); }
.bar.accent > i { background: linear-gradient(90deg, #818cf8, var(--accent)); }
.bar.mid > i { background: #a1a1aa; }
.bar.low > i { background: #d4d4d8; }

/* ---------- 正文 ---------- */
.prose { font-size: 16px; line-height: 1.88; color: #27272a; }
.prose h2 {
  font-size: 1.35rem; font-weight: 700; letter-spacing: -.022em;
  margin: 2.6em 0 .9em; padding-bottom: .55em; border-bottom: 1px solid var(--line);
  color: var(--ink); line-height: 1.4;
}
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 1.08rem; font-weight: 650; margin: 1.9em 0 .6em; color: var(--ink); }
.prose p { margin: 1em 0; }
.prose ul, .prose ol { padding-left: 1.35em; margin: 1em 0; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin: .5em 0; }
.prose li::marker { color: var(--muted-2); }
.prose a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; }
.prose strong { color: var(--ink); font-weight: 650; }
.prose code {
  background: #f4f4f6; border: 1px solid var(--line); padding: .1em .38em;
  border-radius: 6px; font-size: .87em; color: #18181b;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Consolas, monospace;
}
.prose pre {
  background: #0b0b0c; color: #e4e4e7; padding: 20px 22px; border-radius: 12px;
  overflow-x: auto; margin: 1.5em 0; font-size: 13.5px; line-height: 1.72;
}
.prose pre code {
  background: none; border: 0; padding: 0; color: inherit; font-size: inherit;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Consolas, monospace;
}
.prose blockquote {
  border-left: 2px solid var(--ink); padding: .3em 0 .3em 20px; margin: 1.7em 0;
  color: var(--muted); font-style: normal;
}
.prose table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 1.4em 0; }
.prose th { text-align: left; font-weight: 600; font-size: 12.5px; color: var(--muted); padding: 10px 12px; border-bottom: 1px solid var(--line); }
.prose td { padding: 11px 12px; border-bottom: 1px solid var(--line-2); }

/* ---------- 文章头 ---------- */
.article-hero { padding: 56px 0 40px; border-bottom: 1px solid var(--line); background: #fff; }
.crumbs { font-size: 12.5px; color: var(--muted-2); margin-bottom: 18px; }
.crumbs a { color: var(--muted-2); text-decoration: none; }
.crumbs a:hover { color: var(--accent); }
.crumbs span { margin: 0 7px; }

.tag-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.tag {
  display: inline-flex; align-items: center; height: 26px; padding: 0 10px;
  border-radius: 7px; font-size: 12px; font-weight: 600; letter-spacing: .01em;
  background: var(--surface-2); border: 1px solid var(--line); color: var(--ink-3);
  line-height: 1; white-space: nowrap; vertical-align: middle;
}
.tag.accent { background: var(--accent-soft); border-color: #ddd6fe; color: var(--accent); }
.tag.dark { background: var(--ink); border-color: var(--ink); color: #fff; }
.tag-meta { font-size: 12.5px; color: var(--muted-2); }

.article-hero h1 {
  font-size: clamp(1.85rem, 4vw, 2.75rem); line-height: 1.2;
  letter-spacing: -.035em; font-weight: 800; margin: 0; color: var(--ink);
}
.article-lede { margin: 16px 0 0; font-size: 16.5px; color: var(--muted); line-height: 1.78; max-width: 700px; }

/* ---------- 评分概览 ---------- */
.score-hero {
  display: flex; align-items: center; gap: 32px; flex-wrap: wrap;
  padding: 28px; border: 1px solid var(--line); border-radius: var(--radius); background: #fff;
  margin-top: 28px;
}
.score-big { text-align: center; padding-right: 32px; border-right: 1px solid var(--line); }
.score-big .n { font-size: 46px; font-weight: 800; letter-spacing: -.045em; line-height: 1; color: var(--accent); }
.score-big .l { font-size: 12px; color: var(--muted-2); margin-top: 8px; letter-spacing: .06em; }
.score-facts { display: grid; gap: 8px; font-size: 14px; color: var(--ink-3); flex: 1; min-width: 220px; }
.score-facts div { display: flex; align-items: center; gap: 9px; }
.score-facts i { color: var(--ok); font-size: 12px; }

/* ---------- 对比双栏 ---------- */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.compare-box {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; background: #fff;
}
.compare-box.bad { background: #fcfcfd; }
.compare-box.good { border-color: #ddd6fe; box-shadow: 0 0 0 3px rgba(99, 102, 241, .06); }
.compare-head { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; font-weight: 650; font-size: 14.5px; color: var(--ink-2); }
.compare-head .b { width: 32px; height: 32px; border-radius: 9px; display: grid; place-items: center; font-size: 13px; }
.compare-head .b.bad { background: #f4f4f5; color: var(--muted); }
.compare-head .b.good { background: var(--accent-soft); color: var(--accent); }
.bubble { background: var(--surface-2); border: 1px solid var(--line-2); border-radius: 12px; padding: 16px; font-size: 13.5px; color: var(--ink-3); line-height: 1.75; }
.compare-box.good .bubble { background: #fafaff; border-color: #ece9fe; }
.bubble .q { color: var(--muted-2); margin-bottom: 8px; }
.bubble .verdict { margin-top: 12px; font-size: 12px; font-weight: 600; display: flex; align-items: center; gap: 6px; }
.verdict.bad { color: #dc2626; }
.verdict.good { color: var(--ok); }

/* ---------- 列表条目 ---------- */
.list-row {
  display: flex; align-items: flex-start; gap: 16px; padding: 20px 0;
  border-bottom: 1px solid var(--line-2);
}
.list-row:last-child { border-bottom: 0; }
.list-row .k {
  width: 30px; height: 30px; border-radius: 8px; background: var(--surface-2);
  border: 1px solid var(--line); display: grid; place-items: center;
  font-size: 12.5px; font-weight: 700; color: var(--ink-3); flex-shrink: 0;
}
.list-row h4 { margin: 0 0 4px; font-size: 15px; font-weight: 650; color: var(--ink); }
.list-row p { margin: 0; font-size: 13.5px; color: var(--muted); line-height: 1.7; }

/* ---------- CTA 区块 ---------- */
.cta-band { background: var(--ink); color: #fff; padding: 76px 0; position: relative; overflow: hidden; }
.cta-band::before {
  content: ""; position: absolute; top: -50%; right: -10%; width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(99, 102, 241, .22), transparent 65%); pointer-events: none;
}
.cta-band::after {
  content: ""; position: absolute; bottom: -60%; left: -5%; width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(99, 102, 241, .12), transparent 65%); pointer-events: none;
}
.cta-inner { position: relative; z-index: 1; text-align: center; max-width: 660px; margin: 0 auto; }
.cta-inner h2 { font-size: clamp(1.5rem, 3.2vw, 2.2rem); letter-spacing: -.03em; font-weight: 800; margin: 0; line-height: 1.25; }
.cta-inner p { color: #a1a1aa; margin: 16px 0 0; font-size: 15.5px; line-height: 1.75; }
.cta-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 32px; }
.cta-band .btn-dark { background: #fff; color: var(--ink); }
.cta-band .btn-dark:hover { background: #f4f4f5; }
.cta-band .btn-light { background: transparent; color: #fff; border-color: #3f3f46; }
.cta-band .btn-light:hover { background: rgba(255, 255, 255, .06); border-color: #52525b; }
.cta-note { margin-top: 18px; font-size: 12.5px; color: #71717a; }

/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--line); background: #fff; padding-top: 60px; }
.footer-grid { display: grid; grid-template-columns: 1.7fr 1fr 1fr 1fr; gap: 44px; padding-bottom: 48px; }
.footer-brand p { color: var(--muted); font-size: 13.5px; line-height: 1.78; margin: 16px 0 0; max-width: 340px; }
.footer-title {
  font-size: 11.5px; font-weight: 700; letter-spacing: .12em; text-transform: uppercase;
  color: var(--muted-2); margin-bottom: 16px;
}
.footer-links a {
  display: block; color: var(--ink-3); text-decoration: none; font-size: 14px;
  padding: 5px 0; transition: color .18s;
}
.footer-links a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--line); padding: 22px 0;
  font-size: 12.5px; color: var(--muted-2);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}

/* ---------- 工具 ---------- */
.copy-btn {
  display: inline-flex; align-items: center; gap: 7px; height: 36px; padding: 0 14px;
  border: 1px solid var(--line); border-radius: 9px; background: #fff;
  font-size: 13px; font-weight: 600; color: var(--ink-2); cursor: pointer;
  transition: all .18s; font-family: inherit;
}
.copy-btn:hover { border-color: #d4d4d8; background: var(--surface-2); }
.copy-btn.done { background: #ecfdf5; border-color: #a7f3d0; color: var(--ok); }
.code-line {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  background: var(--surface-2); border: 1px solid var(--line); border-radius: 10px;
  padding: 12px 16px; font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 13.5px; color: var(--ink-2);
}
.code-line .lbl { color: var(--muted-2); font-family: inherit; font-size: 12.5px; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .nav { display: none; }
  .menu-btn { display: grid; place-items: center; }
  .header-actions { margin-left: auto; }
  .header-inner { gap: 16px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .compare { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .wrap, .wrap-narrow { padding: 0 18px; }
  .hero { padding: 64px 0 60px; }
  .section { padding: 60px 0; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stats > div { padding: 22px 10px; }
  .stats > div:nth-child(2) { border-right: 0; }
  .stats > div:nth-child(1), .stats > div:nth-child(2) { border-bottom: 1px solid var(--line); }
  .score-hero { flex-direction: column; align-items: flex-start; gap: 20px; }
  .score-big { border-right: 0; padding-right: 0; text-align: left; }
  .article-hero { padding: 36px 0 28px; }
  .cta-band { padding: 56px 0; }
  .brand-text em { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .hero-actions .btn { width: 100%; }
  .section-head-row { margin-bottom: 28px; }
  .feature-grid { grid-template-columns: 1fr !important; }
  .feature-grid > div:last-child {
    border-left: 0 !important;
    border-top: 1px solid var(--line);
  }
}