/* ==========================================================
   BestGEO · 原型样式
   视觉：纸感 / 石墨 / 青色重点 / 细线 / 大留白
   面向数据站的三处调整：表格密度、数字字号、引用块
   ========================================================== */

:root {
  --ink: #141518;
  --stone: #212327;
  --gravel: #5A5E64;
  --smoke: #8A8E95;
  --silver: #C4C7CC;
  --mist: #E8E9EB;
  --paper: #F6F6F7;
  --white: #FFFFFF;
  --accent: #0AE0C0;
  --accent-dim: rgba(10, 224, 192, .12);
  --line: #E4E5E7;
  --line-strong: #D5D7DA;
  --inverse: #F2F3F4;

  --font-cn: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-en: "Helvetica Neue", Arial, sans-serif;
  --font-num: "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  --max: 1400px;
  --gutter: 72px;
  --gap: 24px;

  --ease: cubic-bezier(.16, 1, .3, 1);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--stone);
  font-family: var(--font-cn);
  font-size: 17px;
  line-height: 1.9;
  letter-spacing: .03em;
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, h4, p, figure { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
::selection { background: var(--stone); color: var(--paper); }

/* ---------- 布局 ---------- */

.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.grid12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

/* ---------- 通用文字 ---------- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--gravel);
  line-height: 1.4;
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: .65;
}

.dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  vertical-align: middle;
  margin-left: .35em;
}

.lead { font-size: 19px; line-height: 1.85; color: var(--gravel); }
.muted { color: var(--gravel); }
.micro { font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--smoke); font-family: var(--font-en); }

em { font-style: normal; color: var(--stone); border-bottom: 2px solid var(--accent); }

/* ---------- 导航 ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: rgba(246, 246, 247, .92);
  backdrop-filter: blur(8px);
}
.nav__inner {
  display: flex;
  align-items: center;
  gap: 40px;
  height: 76px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand__mark { width: 24px; height: 24px; flex: 0 0 24px; color: var(--stone); }
.brand__text { display: flex; flex-direction: column; gap: 2px; }
.brand__name { font-size: 17px; font-weight: 500; letter-spacing: .06em; line-height: 1.2; }
.brand__tag { font-size: 10px; line-height: 1.3; letter-spacing: .1em; color: var(--gravel); font-family: var(--font-cn); white-space: nowrap; }

.nav__links { display: flex; align-items: center; gap: 34px; margin-left: auto; }
.nav__links a { font-size: 14px; letter-spacing: .06em; color: var(--gravel); padding-bottom: 3px; border-bottom: 1px solid transparent; }
.nav__links a:hover, .nav__links a.is-active { color: var(--stone); border-bottom-color: var(--stone); }

.nav__item { position: relative; }
.nav__item > a { display: inline-block; }
.nav__menu {
  position: absolute;
  top: calc(100% + 10px);
  left: -14px;
  min-width: 200px;
  background: var(--white);
  border: 1px solid var(--line-strong);
  padding: 6px 0;
  display: none;
  z-index: 60;
}
.nav__item:hover .nav__menu,
.nav__item:focus-within .nav__menu { display: block; }
.nav__menu a {
  display: block;
  padding: 10px 18px;
  font-size: 13px;
  color: var(--gravel);
  border-bottom: 0;
  letter-spacing: .04em;
}
.nav__menu a:hover { background: var(--paper); color: var(--stone); }

.nav__cta {
  border: 1px solid var(--stone);
  padding: 11px 20px;
  font-size: 13px;
  letter-spacing: .08em;
  transition: background .2s var(--ease), color .2s var(--ease);
}
.nav__cta:hover { background: var(--stone); color: var(--paper); }

/* ---------- 首屏 ---------- */

.hero { padding: 96px 0 104px; }
.hero__inner { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--gap); align-items: end; }
.hero__copy { grid-column: 1 / span 7; }
.hero__visual { grid-column: 9 / span 4; }

.hero__title {
  font-size: clamp(46px, 5.6vw, 86px);
  font-weight: 300;
  line-height: 1.12;
  letter-spacing: .04em;
  margin-bottom: 34px;
}
.hero__sub { font-size: 24px; font-weight: 400; letter-spacing: .04em; line-height: 1.6; margin-bottom: 18px; }
.hero__desc { max-width: 560px; font-size: 17px; line-height: 1.95; color: var(--gravel); margin-bottom: 36px; }
.hero__actions { display: flex; align-items: center; gap: 28px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  padding: 16px 26px;
  font-size: 14px;
  letter-spacing: .08em;
  border: 1px solid var(--stone);
}
.btn--solid { background: var(--stone); color: var(--paper); }
.btn--solid:hover { background: var(--ink); }
.link-arrow { display: inline-flex; align-items: center; gap: 10px; font-size: 14px; border-bottom: 1px solid var(--stone); padding-bottom: 4px; }

.hero__meta {
  display: flex;
  gap: 28px;
  margin-top: 46px;
  padding-top: 20px;
  border-top: 1px solid var(--line-strong);
  font-size: 12px;
  color: var(--gravel);
  letter-spacing: .06em;
}
.hero__meta b { font-weight: 500; color: var(--stone); }

/* ---------- 引用榜卡片（首屏视觉） ---------- */

.cite-card {
  background: var(--white);
  border: 1px solid var(--line-strong);
  padding: 22px 24px 18px;
}
.cite-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.cite-card__head span:first-child { font-family: var(--font-en); font-size: 10px; letter-spacing: .26em; text-transform: uppercase; color: var(--gravel); }
.cite-card__live { display: inline-flex; align-items: center; gap: 7px; font-family: var(--font-en); font-size: 10px; letter-spacing: .2em; color: var(--gravel); }
.cite-card__live i { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

.cite-row {
  display: grid;
  grid-template-columns: 26px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}
.cite-row__no { font-family: var(--font-num); font-size: 11px; color: var(--smoke); }
.cite-row__name { font-size: 14px; letter-spacing: .04em; }
.cite-row__bar { grid-column: 2 / span 1; height: 2px; background: var(--mist); position: relative; margin-top: -6px; }
.cite-row__bar i { position: absolute; left: 0; top: 0; height: 2px; background: var(--stone); }
.cite-row--top .cite-row__bar i { background: var(--accent); }
.cite-row__val { font-family: var(--font-num); font-size: 15px; font-variant-numeric: tabular-nums; }

.cite-card__foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 14px;
  font-size: 11px;
  color: var(--smoke);
  letter-spacing: .06em;
}

/* ---------- 区块 ---------- */

.section { padding: 112px 0; }
.section--tight { padding: 76px 0; }
.section--dark { background: var(--stone); color: var(--inverse); padding: 104px 0; }
.section--white { background: var(--white); }
.section--line { border-top: 1px solid var(--line-strong); }
.section--dark .eyebrow { color: var(--silver); }
.section--dark .muted { color: var(--silver); }

.section__head { display: flex; align-items: flex-end; justify-content: space-between; gap: 40px; }
.section__title {
  font-size: clamp(32px, 3.4vw, 50px);
  font-weight: 400;
  line-height: 1.28;
  letter-spacing: .04em;
}
.section--dark .section__title { font-weight: 300; }
.section__label { font-size: 12px; letter-spacing: .1em; color: var(--gravel); }

.rule { height: 1px; background: var(--line-strong); margin: 40px 0; }
.section--dark .rule { background: rgba(255, 255, 255, .14); }

/* ---------- 三步说明（深色区） ---------- */

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; margin-top: 56px; }
.step { padding: 26px 34px 0 0; border-right: 1px solid rgba(255, 255, 255, .14); }
.step:last-child { border-right: 0; }
.step__no { font-family: var(--font-num); font-size: 11px; letter-spacing: .18em; color: var(--silver); }
.step__title { margin: 14px 0 10px; font-size: 22px; font-weight: 500; letter-spacing: .04em; }
.step__text { font-size: 15px; line-height: 1.95; color: var(--silver); }

/* ---------- 数据卡 ---------- */

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--line-strong); }
.stat { padding: 26px 24px 26px 0; border-right: 1px solid var(--line); }
.stat:last-child { border-right: 0; }
.stat__num { font-family: var(--font-num); font-size: 46px; font-weight: 300; letter-spacing: -.01em; line-height: 1.1; font-variant-numeric: tabular-nums; }
.stat__num small { font-size: 16px; color: var(--gravel); margin-left: 4px; letter-spacing: 0; }
.stat__label { margin-top: 8px; font-size: 13px; color: var(--gravel); letter-spacing: .04em; }
.stat__source { margin-top: 4px; font-size: 11px; color: var(--smoke); }

/* ---------- 数据表 ---------- */

.table-wrap { border-top: 1px solid var(--stone); margin-top: 12px; overflow-x: auto; }
table.data { width: 100%; border-collapse: collapse; }
table.data th {
  text-align: left;
  font-family: var(--font-en);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gravel);
  padding: 12px 16px 12px 0;
  border-bottom: 1px solid var(--line-strong);
  white-space: nowrap;
}
table.data td {
  padding: 15px 16px 15px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  vertical-align: baseline;
}
table.data td.num { font-family: var(--font-num); font-variant-numeric: tabular-nums; text-align: right; }
table.data th.num { text-align: right; }
table.data tr.is-key td { background: rgba(10, 224, 192, .06); }
table.data td .tag {
  display: inline-block;
  border: 1px solid var(--line-strong);
  padding: 1px 7px;
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--gravel);
}
.up { color: var(--stone); }
.down { color: var(--smoke); }

/* ---------- 结论句 ---------- */

.answer-first {
  border-left: 2px solid var(--accent);
  padding: 4px 0 4px 26px;
  margin: 34px 0 0;
  max-width: 880px;
}
.answer-first p { font-size: 21px; line-height: 1.85; letter-spacing: .02em; }
.answer-first .src { margin-top: 12px; font-size: 12px; color: var(--gravel); }

/* ---------- 引用格式块 ---------- */

.citebox {
  border: 1px solid var(--line-strong);
  background: var(--white);
  padding: 22px 24px;
  display: flex;
  align-items: flex-start;
  gap: 24px;
}
.citebox__label { flex: 0 0 96px; font-size: 11px; letter-spacing: .16em; text-transform: uppercase; color: var(--smoke); font-family: var(--font-en); padding-top: 3px; }
.citebox__code {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  color: var(--stone);
  word-break: break-all;
}
.section--dark .citebox { background: rgba(255, 255, 255, .04); border-color: rgba(255, 255, 255, .16); }
.section--dark .citebox__code { color: var(--inverse); }

/* ---------- 报告行 ---------- */

.rows { border-top: 1px solid var(--line-strong); margin-top: 44px; }
.row-item {
  display: grid;
  grid-template-columns: 92px 1fr 200px 130px;
  gap: 28px;
  align-items: center;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
  transition: background .2s var(--ease);
}
.row-item:hover { background: rgba(255, 255, 255, .6); }
.row-item__date { font-family: var(--font-num); font-size: 12px; color: var(--smoke); letter-spacing: .06em; }
.row-item__title { font-size: 19px; letter-spacing: .02em; }
.row-item__desc { font-size: 13px; color: var(--gravel); margin-top: 6px; }
.row-item__meta { font-size: 12px; color: var(--gravel); }
.row-item__arrow { justify-self: end; font-size: 18px; color: var(--smoke); }

/* ---------- 页内目录（右侧） ---------- */

.toc {
  position: fixed;
  right: 26px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 40;
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 11px;
  letter-spacing: .12em;
}
.toc b { font-family: var(--font-en); font-size: 9px; letter-spacing: .2em; color: var(--smoke); writing-mode: vertical-rl; margin: 0 auto 6px; }
.toc a { display: flex; align-items: center; gap: 8px; color: var(--smoke); white-space: nowrap; }
.toc a i { width: 14px; height: 1px; background: var(--line-strong); }
.toc a.is-active { color: var(--stone); }
.toc a.is-active i { width: 22px; background: var(--accent); height: 2px; }

/* ---------- 页脚 ---------- */

.footer { background: var(--ink); color: var(--silver); padding: 72px 0 40px; }
.footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer .brand__mark { color: var(--silver); }
.footer .brand__name { color: var(--inverse); }
.footer__desc { margin-top: 18px; font-size: 13px; line-height: 1.95; max-width: 340px; color: var(--smoke); }
.footer h4 { font-size: 12px; font-weight: 500; letter-spacing: .14em; color: var(--inverse); margin-bottom: 16px; }
.footer ul li { margin-bottom: 9px; }
.footer ul a { font-size: 13px; color: var(--smoke); }
.footer ul a:hover { color: var(--inverse); }
.footer__bottom {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 56px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, .1);
  font-size: 12px;
  color: var(--smoke);
}

.footer__bottom a {
  color: inherit;
  border-bottom: 1px solid rgba(255, 255, 255, .18);
}
.footer__bottom a:hover { color: var(--inverse); border-bottom-color: var(--inverse); }

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 26px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, .06);
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: .04em;
  color: var(--smoke);
}
.footer__legal a { color: var(--smoke); border-bottom: 1px solid rgba(255, 255, 255, .16); }
.footer__legal a:hover { color: var(--inverse); border-bottom-color: var(--inverse); }
.footer__legal .todo { color: #D9A15B; border-bottom-color: #D9A15B; }

/* ---------- 文档页 ---------- */

.doc { max-width: 780px; }
.doc h2 {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: .04em;
  margin: 52px 0 16px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}
.doc h2:first-of-type { margin-top: 0; padding-top: 0; border-top: 0; }
.doc p, .doc li { font-size: 16px; line-height: 1.95; color: var(--gravel); }
.doc p + p { margin-top: 14px; }
.doc ul { margin: 12px 0 0; padding-left: 1.1em; list-style: disc; }
.doc li { margin-bottom: 6px; }
.doc strong { color: var(--stone); font-weight: 500; }
.doc .meta-line {
  display: flex; flex-wrap: wrap; gap: 8px 28px;
  margin-top: 22px; font-size: 13px; color: var(--smoke);
}
.doc .draft-note {
  border-left: 2px solid var(--accent);
  padding: 12px 0 12px 18px;
  font-size: 14px;
  color: var(--gravel);
}

/* ---------- 产品行（logo 占位） ---------- */

.prod { display: flex; align-items: center; gap: 12px; }
.prod__tile {
  flex: 0 0 26px;
  width: 26px;
  height: 26px;
  border: 1px solid var(--line-strong);
  display: grid;
  place-items: center;
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0;
  color: var(--stone);
  background: var(--white);
}
.prod__tile--en { font-family: var(--font-en); font-size: 11px; letter-spacing: .02em; }
.prod__logo {
  flex: 0 0 24px;
  width: 24px;
  height: 24px;
  border-radius: 5px;
}

/* ---------- 数据页专用 ---------- */

.page-head { padding: 64px 0 44px; border-bottom: 1px solid var(--line-strong); }
.crumb { display: flex; gap: 10px; font-size: 12px; color: var(--smoke); letter-spacing: .06em; margin-bottom: 26px; }
.crumb a:hover { color: var(--stone); }
.page-title { font-size: clamp(36px, 4.2vw, 60px); font-weight: 300; line-height: 1.2; letter-spacing: .04em; margin-bottom: 16px; }
.page-sub { font-size: 18px; color: var(--gravel); max-width: 760px; }

.meta-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-top: 34px;
  border-top: 1px solid var(--line);
}
.meta-strip div {
  padding: 14px 26px 0 0;
  margin-right: 26px;
  border-right: 1px solid var(--line);
  font-size: 12px;
  color: var(--gravel);
}
.meta-strip div:last-child { border-right: 0; }
.meta-strip b { display: block; font-family: var(--font-num); font-size: 15px; color: var(--stone); font-weight: 400; margin-top: 2px; }

.bars { margin-top: 8px; }
.bar-row { display: grid; grid-template-columns: 120px 1fr 70px; gap: 16px; align-items: center; padding: 9px 0; }
.bar-row span:first-child { font-size: 13px; color: var(--gravel); }
.bar-track { height: 8px; background: var(--mist); }
.bar-track i { display: block; height: 8px; background: var(--stone); }
.bar-row:first-child .bar-track i { background: var(--accent); }
.bar-row b { font-family: var(--font-num); font-size: 14px; font-weight: 400; text-align: right; font-variant-numeric: tabular-nums; }

.note {
  border: 1px solid var(--line-strong);
  background: var(--white);
  padding: 20px 24px;
  font-size: 13px;
  line-height: 1.9;
  color: var(--gravel);
}
.note b { color: var(--stone); font-weight: 500; }

.download {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--stone);
  padding: 13px 22px;
  font-size: 13px;
  letter-spacing: .06em;
}
.download:hover { background: var(--stone); color: var(--paper); }

/* ---------- 响应式 ---------- */

@media (max-width: 1180px) {
  :root { --gutter: 40px; }
  .hero__copy { grid-column: 1 / span 12; }
  .hero__visual { grid-column: 1 / span 8; margin-top: 56px; }
  .toc { display: none; }
}

@media (max-width: 760px) {
  :root { --gutter: 22px; }
  body { font-size: 16px; }
  .nav__links { display: none; }
  .hero { padding: 56px 0 64px; }
  .hero__visual { grid-column: 1 / -1; margin-top: 40px; }
  .hero__title { font-size: 40px; }
  .hero__sub { font-size: 19px; }
  .section { padding: 64px 0; }
  .steps { grid-template-columns: 1fr; }
  .step { border-right: 0; border-bottom: 1px solid rgba(255, 255, 255, .14); padding: 22px 0; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat { padding: 20px 16px 20px 0; }
  .stat__num { font-size: 34px; }
  .row-item { grid-template-columns: 1fr; gap: 8px; }
  .section__head { flex-wrap: wrap; gap: 16px; }
  .grid12 > * { grid-column: 1 / -1 !important; }
  .table-wrap table.data { min-width: 620px; }
  .method-grid { grid-template-columns: 1fr !important; }
  .method-grid .stat { border-right: 0; }
  .cite-card__foot { flex-wrap: wrap; gap: 6px; }
  .subscribe-box { flex-direction: column; align-items: stretch !important; gap: 12px; }
  .row-item__arrow { justify-self: start; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .citebox { flex-direction: column; gap: 10px; }
  .bar-row { grid-template-columns: 90px 1fr 56px; }
  table.data { font-size: 13px; }
  table.data td, table.data th { padding-right: 10px; }
}