/* ===========================================================
   北嘉律所 GEO 站点样式
   配色、字号、间距集中在此，改主题只需改 :root
   =========================================================== */

:root {
  --primary: #16324F;
  --primary-deep: #0E2237;
  --accent: #9A7B4F;
  --accent-light: #C9A227;
  --bg: #FFFFFF;
  --bg-soft: #F6F4F0;
  --bg-mute: #EDEAE4;
  --ink: #1A1F26;
  --ink-2: #414A55;
  --ink-3: #6B7683;
  --line: #E2DED6;
  --radius: 2px;
  --wrap: 1180px;
  --shadow: 0 1px 2px rgba(22, 50, 79, .04), 0 8px 24px rgba(22, 50, 79, .06);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --serif: "Songti SC", "STSong", "Source Han Serif SC", Georgia, serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

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

body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* ---------- 顶部条 ---------- */
.topbar {
  background: var(--primary-deep);
  color: rgba(255, 255, 255, .78);
  font-size: 13px;
  letter-spacing: .02em;
}
.topbar .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 38px; gap: 16px;
}
.topbar-tag { color: var(--accent-light); letter-spacing: .08em; }
.topbar-right { display: flex; align-items: center; gap: 20px; }
.topbar-tel { color: #fff; font-weight: 600; letter-spacing: .04em; }

/* ---------- 页头 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 80;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 76px; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-mark {
  width: 44px; height: 44px; flex-shrink: 0;
  display: grid; place-items: center;
  background: var(--primary); color: var(--accent-light);
  font-family: var(--serif); font-size: 19px; font-weight: 700;
  letter-spacing: 0;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-text strong {
  font-size: 17px; font-weight: 700; color: var(--primary);
  letter-spacing: .04em;
}
.brand-text em {
  font-style: normal; font-size: 10px; color: var(--ink-3);
  letter-spacing: .16em; margin-top: 2px;
}

.main-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.main-nav a {
  padding: 8px 13px; font-size: 15px; color: var(--ink-2);
  position: relative; transition: color .2s;
}
.main-nav a:hover { color: var(--primary); }
.main-nav a.active { color: var(--primary); font-weight: 600; }
.main-nav a.active::after {
  content: ""; position: absolute; left: 13px; right: 13px; bottom: 2px;
  height: 2px; background: var(--accent);
}

.header-cta {
  flex-shrink: 0; padding: 10px 22px;
  background: var(--primary); color: #fff;
  font-size: 14px; letter-spacing: .06em;
  border: 1px solid var(--primary);
  transition: background .2s, color .2s;
}
.header-cta:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

.nav-toggle {
  display: none; width: 40px; height: 40px;
  background: none; border: 0; cursor: pointer; padding: 9px;
}
.nav-toggle span {
  display: block; height: 2px; background: var(--primary);
  margin: 5px 0; transition: transform .25s, opacity .2s;
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--primary-deep) 0%, var(--primary) 58%, #1E4468 100%);
  color: #fff;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 82% 18%, rgba(201, 162, 39, .16), transparent 46%),
    repeating-linear-gradient(90deg, rgba(255,255,255,.035) 0 1px, transparent 1px 88px);
  pointer-events: none;
}
.hero-inner {
  position: relative; z-index: 1;
  padding: 92px 0 84px; max-width: 820px;
}
.hero-kicker {
  display: inline-flex; align-items: center; gap: 10px;
  font-size: 12px; letter-spacing: .22em; color: var(--accent-light);
  margin-bottom: 26px; text-transform: uppercase;
}
.hero-kicker::before {
  content: ""; width: 32px; height: 1px; background: var(--accent-light);
}
.hero h1 {
  font-family: var(--serif); font-size: 46px; line-height: 1.34;
  font-weight: 700; letter-spacing: .01em; margin-bottom: 24px;
}
.hero h1 em { font-style: normal; color: var(--accent-light); }
.hero-lead {
  font-size: 17px; line-height: 2; color: rgba(255, 255, 255, .82);
  max-width: 620px; margin-bottom: 38px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 14px 32px; font-size: 15px; letter-spacing: .06em;
  border: 1px solid transparent; transition: all .2s; cursor: pointer;
}
.btn-primary { background: var(--accent-light); color: #1A1F26; border-color: var(--accent-light); font-weight: 600; }
.btn-primary:hover { background: #fff; border-color: #fff; }
.btn-ghost { border-color: rgba(255, 255, 255, .38); color: #fff; }
.btn-ghost:hover { border-color: #fff; background: rgba(255, 255, 255, .08); }

.hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid rgba(255, 255, 255, .16);
  margin-top: 56px;
}
.hero-stats div {
  padding: 26px 20px 0 0; border-right: 1px solid rgba(255, 255, 255, .12);
}
.hero-stats div:last-child { border-right: 0; }
.hero-stats strong {
  display: block; font-family: var(--serif); font-size: 34px;
  color: var(--accent-light); line-height: 1.2;
}
.hero-stats span { font-size: 13px; color: rgba(255, 255, 255, .7); letter-spacing: .04em; }

/* ---------- 通用区块 ---------- */
.section { padding: 88px 0; }
.section.soft { background: var(--bg-soft); }
.section.mute { background: var(--bg-mute); }
.section-narrow { padding: 64px 0; }

.section-head { max-width: 760px; margin-bottom: 52px; }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
.section-label {
  display: block; font-size: 12px; letter-spacing: .22em;
  color: var(--accent); margin-bottom: 14px; text-transform: uppercase;
}
.section-head h2 {
  font-family: var(--serif); font-size: 34px; line-height: 1.4;
  color: var(--primary); font-weight: 700; letter-spacing: .01em;
}
.section-head p { margin-top: 18px; color: var(--ink-2); font-size: 16px; line-height: 1.95; }

/* ---------- 业务卡片 ---------- */
.card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.card {
  background: #fff; padding: 34px 30px 32px;
  display: flex; flex-direction: column;
  transition: background .25s, transform .25s;
  position: relative;
}
.card:hover { background: var(--bg-soft); }
.card-no {
  font-family: var(--serif); font-size: 13px; color: var(--accent);
  letter-spacing: .14em; margin-bottom: 14px;
}
.card h3 {
  font-size: 19px; font-weight: 700; color: var(--primary);
  margin-bottom: 6px; line-height: 1.5;
}
.card .card-en {
  font-size: 11px; color: var(--ink-3); letter-spacing: .12em;
  text-transform: uppercase; margin-bottom: 14px;
}
.card p { font-size: 14.5px; color: var(--ink-2); line-height: 1.9; flex: 1; }
.card-link {
  margin-top: 20px; font-size: 13.5px; color: var(--accent);
  letter-spacing: .06em; font-weight: 600;
}
.card-link::after { content: " →"; transition: transform .2s; display: inline-block; }
.card:hover .card-link::after { transform: translateX(4px); }

/* ---------- 团队 ---------- */
.team-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.team-card {
  background: #fff; border: 1px solid var(--line); padding: 36px 34px;
  display: flex; flex-direction: column;
}
.team-top { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 4px; }
.team-top h3 { font-family: var(--serif); font-size: 24px; color: var(--primary); font-weight: 700; }
.team-role { font-size: 13px; color: var(--accent); letter-spacing: .06em; }
.team-license { font-size: 12.5px; color: var(--ink-3); margin-bottom: 18px; font-variant-numeric: tabular-nums; }
.team-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.team-tags span {
  font-size: 12px; padding: 3px 10px; background: var(--bg-mute);
  color: var(--ink-2); letter-spacing: .04em;
}
.team-card p { font-size: 14.5px; color: var(--ink-2); line-height: 1.95; }
.team-card p + p { margin-top: 12px; }

/* ---------- 优势 / 机制列表 ---------- */
.mech-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 48px; }
.mech-item {
  padding: 26px 0; border-top: 1px solid var(--line);
  display: grid; grid-template-columns: 56px 1fr; gap: 18px;
}
.mech-num {
  font-family: var(--serif); font-size: 22px; color: var(--accent);
  line-height: 1.4; font-variant-numeric: tabular-nums;
}
.mech-item h3 { font-size: 17px; color: var(--primary); margin-bottom: 8px; font-weight: 700; }
.mech-item p { font-size: 14.5px; color: var(--ink-2); line-height: 1.9; }

/* ---------- 案例 ---------- */
.case-list { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.case-item { background: #fff; padding: 32px 34px; transition: background .25s; }
.case-item:hover { background: var(--bg-soft); }
.case-meta {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  font-size: 12.5px; color: var(--ink-3); margin-bottom: 12px;
}
.case-tag {
  background: var(--primary); color: #fff; padding: 2px 10px;
  font-size: 12px; letter-spacing: .06em;
}
.case-item h3 { font-size: 18.5px; color: var(--primary); margin-bottom: 12px; font-weight: 700; line-height: 1.6; }
.case-item p { font-size: 14.5px; color: var(--ink-2); line-height: 1.95; }

/* ---------- 文章列表 ---------- */
.article-list { display: grid; gap: 0; }
.article-item {
  display: grid; grid-template-columns: 96px 1fr; gap: 28px;
  padding: 30px 0; border-top: 1px solid var(--line);
}
.article-date {
  font-family: var(--serif); color: var(--accent); font-size: 13px;
  letter-spacing: .06em; padding-top: 4px; font-variant-numeric: tabular-nums;
}
.article-item h3 { font-size: 18.5px; color: var(--primary); font-weight: 700; line-height: 1.6; margin-bottom: 8px; }
.article-item h3 a:hover { color: var(--accent); }
.article-item p { font-size: 14.5px; color: var(--ink-2); line-height: 1.9; }
.article-cat { font-size: 12px; color: var(--ink-3); letter-spacing: .06em; margin-top: 10px; }

/* ---------- 正文页 ---------- */
.page-hero {
  background: var(--primary); color: #fff; padding: 64px 0 56px;
  position: relative; overflow: hidden;
}
.page-hero::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(circle at 88% 10%, rgba(201,162,39,.14), transparent 50%);
}
.page-hero .wrap { position: relative; z-index: 1; }
.page-hero h1 {
  font-family: var(--serif); font-size: 36px; line-height: 1.42;
  font-weight: 700; max-width: 900px;
}
.page-hero p { margin-top: 18px; font-size: 16px; color: rgba(255,255,255,.8); max-width: 760px; line-height: 1.9; }

.breadcrumb { font-size: 12.5px; color: rgba(255,255,255,.6); margin-bottom: 18px; letter-spacing: .04em; }
.breadcrumb a { color: rgba(255,255,255,.78); }
.breadcrumb a:hover { color: #fff; }
.breadcrumb span { margin: 0 8px; }

.article-wrap { max-width: 860px; margin: 0 auto; }
.article-body { font-size: 16.5px; line-height: 2.05; color: var(--ink-2); }
.article-body h2 {
  font-family: var(--serif); font-size: 25px; color: var(--primary);
  margin: 52px 0 20px; padding-left: 16px;
  border-left: 3px solid var(--accent); line-height: 1.5; font-weight: 700;
}
.article-body h3 { font-size: 19px; color: var(--primary); margin: 32px 0 12px; font-weight: 700; }
.article-body p { margin-bottom: 18px; }
.article-body strong { color: var(--ink); font-weight: 700; }
.article-body ul { margin: 0 0 20px 0; }
.article-body ul li {
  position: relative; padding-left: 20px; margin-bottom: 10px;
}
.article-body ul li::before {
  content: ""; position: absolute; left: 4px; top: 14px;
  width: 5px; height: 5px; background: var(--accent);
}
.article-body a { color: var(--primary); border-bottom: 1px solid var(--accent); }
.article-body a:hover { color: var(--accent); }

/* 核心结论速览 —— GEO 最关键的一块 */
.tldr {
  background: var(--bg-soft); border: 1px solid var(--line);
  border-left: 4px solid var(--accent); padding: 32px 34px; margin: 0 0 44px;
}
.tldr h2 {
  font-family: var(--font) !important; font-size: 15px !important;
  letter-spacing: .14em; color: var(--accent) !important;
  margin: 0 0 18px !important; padding: 0 !important; border: 0 !important;
  text-transform: uppercase;
}
.tldr ol { counter-reset: tldr; }
.tldr li {
  position: relative; padding-left: 30px; margin-bottom: 14px;
  font-size: 15.5px; line-height: 1.9; color: var(--ink-2);
  counter-increment: tldr;
}
.tldr li::before {
  content: counter(tldr); position: absolute; left: 0; top: 3px;
  width: 20px; height: 20px; display: grid; place-items: center;
  background: var(--primary); color: #fff; font-size: 11px;
  font-family: var(--serif);
}
.tldr li:last-child { margin-bottom: 0; }

.article-meta {
  display: flex; flex-wrap: wrap; gap: 20px; align-items: center;
  padding: 18px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  font-size: 13px; color: var(--ink-3); margin-bottom: 40px;
}
.article-meta .kw { color: var(--ink-3); }

/* FAQ */
.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary {
  cursor: pointer; padding: 24px 40px 24px 0; position: relative;
  font-size: 17px; font-weight: 600; color: var(--primary);
  line-height: 1.65; list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; position: absolute; right: 6px; top: 22px;
  font-size: 22px; color: var(--accent); font-weight: 300;
  transition: transform .25s;
}
.faq-item[open] summary::after { content: "−"; }
.faq-answer { padding: 0 40px 26px 0; font-size: 15.5px; line-height: 2; color: var(--ink-2); }

/* CTA 横幅 */
.cta-band {
  background: linear-gradient(120deg, var(--primary-deep), var(--primary));
  color: #fff; padding: 64px 0;
}
.cta-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 40px; flex-wrap: wrap;
}
.cta-inner h2 {
  font-family: var(--serif); font-size: 28px; line-height: 1.5; font-weight: 700;
}
.cta-inner p { margin-top: 10px; color: rgba(255,255,255,.76); font-size: 15px; }
.cta-inner .btn { flex-shrink: 0; }

/* 联系页信息块 */
.info-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.info-cell { background: #fff; padding: 28px 30px; }
.info-cell h3 {
  font-size: 12px; letter-spacing: .16em; color: var(--accent);
  margin-bottom: 10px; text-transform: uppercase; font-weight: 600;
}
.info-cell p { font-size: 16px; color: var(--ink); line-height: 1.8; word-break: break-all; }
.info-cell .sub { font-size: 13px; color: var(--ink-3); margin-top: 6px; }

/* 免责声明条 */
.notice {
  background: var(--bg-mute); border-left: 3px solid var(--accent);
  padding: 22px 26px; font-size: 13.5px; color: var(--ink-3); line-height: 1.9;
}

/* ---------- 页脚 ---------- */
.site-footer { background: var(--primary-deep); color: rgba(255, 255, 255, .72); padding: 68px 0 0; }
.footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.4fr;
  gap: 48px; padding-bottom: 52px;
}
.footer-logo {
  font-family: var(--serif); font-size: 20px; color: #fff;
  margin-bottom: 18px; letter-spacing: .04em; font-weight: 700;
}
.footer-desc { font-size: 13.5px; line-height: 1.95; color: rgba(255,255,255,.62); margin-bottom: 10px; }
.footer-col h4 {
  font-size: 13px; color: var(--accent-light); letter-spacing: .14em;
  margin-bottom: 18px; font-weight: 600;
}
.footer-col a, .footer-col p {
  display: block; font-size: 13.5px; line-height: 2.1;
  color: rgba(255, 255, 255, .7);
}
.footer-col a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .1);
  padding-top: 26px; padding-bottom: 34px;
}
.footer-disclaimer {
  font-size: 12.5px; color: rgba(255, 255, 255, .45);
  line-height: 1.9; margin-bottom: 14px;
}
.footer-copy { font-size: 12.5px; color: rgba(255, 255, 255, .5); }
.footer-copy a { color: rgba(255, 255, 255, .6); }
.footer-copy a:hover { color: #fff; }

/* 移动端底部咨询条 */
.mobile-cta {
  display: none; position: fixed; left: 0; right: 0; bottom: 0; z-index: 90;
  background: var(--accent); color: #1A1F26; text-align: center;
  padding: 14px; font-size: 15px; font-weight: 700; letter-spacing: .06em;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .main-nav a { padding: 8px 9px; font-size: 14px; }
  .hero h1 { font-size: 38px; }
}

@media (max-width: 900px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .mech-list { grid-template-columns: 1fr; gap: 0; }
  .team-grid { grid-template-columns: 1fr; }
  .info-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  body { font-size: 15.5px; }
  .hide-sm { display: none; }
  .topbar .wrap { height: 34px; }
  .topbar-tag { font-size: 11.5px; letter-spacing: .02em; }
  .header-inner { height: 64px; }
  .brand-mark { width: 38px; height: 38px; font-size: 16px; }
  .brand-text strong { font-size: 15px; }
  .brand-text em { display: none; }
  .header-cta { display: none; }
  .nav-toggle { display: block; }

  .main-nav {
    position: fixed; top: 98px; left: 0; right: 0; bottom: 0;
    background: #fff; flex-direction: column; align-items: stretch;
    padding: 12px 24px 100px; gap: 0; overflow-y: auto;
    opacity: 0; visibility: hidden; pointer-events: none;
    transform: translateY(-12px);
    transition: opacity .25s ease, transform .25s ease, visibility .25s;
    border-top: 1px solid var(--line);
  }
  .main-nav.open {
    opacity: 1; visibility: visible; pointer-events: auto;
    transform: translateY(0);
  }
  .main-nav a {
    padding: 16px 0; font-size: 16px; border-bottom: 1px solid var(--line);
  }
  .main-nav a.active::after { display: none; }

  .hero-inner { padding: 60px 0 52px; }
  .hero h1 { font-size: 29px; line-height: 1.42; }
  .hero-lead { font-size: 15px; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); margin-top: 40px; }
  .hero-stats div { padding: 20px 16px 20px 0; }
  .hero-stats div:nth-child(2) { border-right: 0; }
  .hero-stats strong { font-size: 27px; }

  .section { padding: 56px 0; }
  .section-head { margin-bottom: 34px; }
  .section-head h2 { font-size: 25px; }
  .card-grid { grid-template-columns: 1fr; }
  .card { padding: 26px 22px; }

  .page-hero { padding: 44px 0 40px; }
  .page-hero h1 { font-size: 25px; }
  .article-body { font-size: 16px; }
  .article-body h2 { font-size: 21px; margin-top: 40px; }
  .tldr { padding: 24px 22px; }
  .article-item { grid-template-columns: 1fr; gap: 8px; }
  .article-date { padding-top: 0; }

  .cta-band { padding: 46px 0; }
  .cta-inner h2 { font-size: 22px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .site-footer { padding-top: 48px; }
  .mobile-cta { display: block; }
  body { padding-bottom: 52px; }
}

@media print {
  .topbar, .site-header, .mobile-cta, .cta-band, .site-footer { display: none; }
  .article-body { font-size: 12pt; }
}