/* ============================================
   蓝V认证网 · 全站样式
   ============================================ */
:root {
  --blue: #1662e8;
  --blue-deep: #0a3d91;
  --blue-light: #2b7fff;
  --blue-bg: #f2f7ff;
  --ink: #17233a;
  --ink-2: #45526b;
  --ink-3: #7a86a0;
  --line: #e6ecf6;
  --bg: #f6f9fd;
  --card: #ffffff;
  --ok: #16a34a;
  --warn-bg: #fff8ea;
  --warn-line: #f5dfae;
  --warn-ink: #8a6116;
  --radius: 16px;
  --shadow: 0 6px 24px rgba(23, 58, 128, 0.07);
  --shadow-lg: 0 14px 40px rgba(23, 58, 128, 0.13);
  --dy: #1f1f27;
  --dy2: #fe2c55;
  --ks: #ff7300;
  --sph: #07c160;
  --xhs: #ff2442;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.75;
  font-size: 16px;
}
img { max-width: 100%; }
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-deep); }
ul, ol { padding-left: 1.3em; }
.container { max-width: 1180px; margin: 0 auto; padding: 0 20px; }

/* ---------- 头部 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  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: 28px; height: 64px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 800; color: var(--ink); white-space: nowrap; }
.logo:hover { color: var(--blue-deep); }
.logo-mark {
  width: 34px; height: 34px; border-radius: 10px; flex: none;
  background: linear-gradient(135deg, var(--blue-light), var(--blue-deep));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 800; letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(22, 98, 232, 0.35);
}
.logo-mark svg { width: 18px; height: 18px; }
.main-nav { display: flex; align-items: center; gap: 4px; flex: 1; }
.main-nav > li { list-style: none; position: relative; }
.main-nav > li > a {
  display: block; padding: 8px 13px; border-radius: 9px;
  color: var(--ink-2); font-size: 15px; font-weight: 500; white-space: nowrap;
}
.main-nav > li > a:hover, .main-nav > li > a.active { color: var(--blue); background: var(--blue-bg); }
.main-nav .sub {
  position: absolute; top: calc(100% + 8px); left: 50%; transform: translateX(-50%) translateY(6px);
  background: #fff; border: 1px solid var(--line); border-radius: 14px;
  box-shadow: var(--shadow-lg); padding: 8px; min-width: 168px;
  opacity: 0; visibility: hidden; transition: all 0.18s ease; list-style: none;
}
.main-nav li:hover .sub { opacity: 1; visibility: visible; transform: translateX(-50%) translateY(0); }
.main-nav .sub a { display: block; padding: 8px 14px; border-radius: 8px; color: var(--ink-2); font-size: 14px; white-space: nowrap; }
.main-nav .sub a:hover { background: var(--blue-bg); color: var(--blue); }
.nav-cta {
  flex: none; display: inline-flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, var(--blue-light), var(--blue-deep));
  color: #fff !important; padding: 9px 18px; border-radius: 999px;
  font-size: 14px; font-weight: 600;
  box-shadow: 0 4px 14px rgba(22, 98, 232, 0.35);
}
.nav-cta:hover { filter: brightness(1.08); }
.nav-toggle { display: none; border: none; background: none; cursor: pointer; padding: 8px; margin-left: auto; }
.nav-toggle svg { width: 24px; height: 24px; display: block; color: var(--ink); }

/* ---------- 通用区块 ---------- */
.section { padding: 72px 0; }
.section.alt { background: #fff; }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 44px; }
.section-kicker {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--blue); font-size: 13px; font-weight: 700; letter-spacing: 2px;
  text-transform: uppercase; margin-bottom: 12px;
}
.section-kicker::before, .section-kicker::after {
  content: ""; width: 22px; height: 2px; background: var(--blue); border-radius: 2px; opacity: 0.4;
}
.section-title { font-size: 32px; font-weight: 800; line-height: 1.35; letter-spacing: 0.5px; }
.section-sub { color: var(--ink-3); margin-top: 12px; font-size: 16px; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, #072f6f 0%, #0a3d91 45%, #1662e8 100%);
  color: #fff; padding: 84px 0 96px;
}
.hero::before {
  content: ""; position: absolute; width: 560px; height: 560px; border-radius: 50%;
  background: radial-gradient(circle, rgba(88, 168, 255, 0.35), transparent 65%);
  top: -220px; right: -120px;
}
.hero::after {
  content: ""; position: absolute; width: 420px; height: 420px; border-radius: 50%;
  background: radial-gradient(circle, rgba(43, 127, 255, 0.28), transparent 65%);
  bottom: -200px; left: -100px;
}
.hero-inner { position: relative; z-index: 1; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255, 255, 255, 0.14); border: 1px solid rgba(255, 255, 255, 0.28);
  padding: 7px 16px; border-radius: 999px; font-size: 13.5px; letter-spacing: 1px;
  margin-bottom: 22px; backdrop-filter: blur(6px);
}
.hero h1 { font-size: 44px; line-height: 1.3; font-weight: 800; letter-spacing: 1px; max-width: 720px; }
.hero h1 .hl { color: #8fd0ff; }
.hero-sub { margin-top: 18px; font-size: 18px; color: rgba(255, 255, 255, 0.88); max-width: 640px; }
.hero-points { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero-points span {
  display: inline-flex; align-items: center; gap: 7px;
  background: rgba(255, 255, 255, 0.12); border: 1px solid rgba(255, 255, 255, 0.22);
  padding: 8px 16px; border-radius: 999px; font-size: 14px; font-weight: 500;
}
.hero-cta { display: flex; align-items: center; gap: 18px; margin-top: 34px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 13px 30px; border-radius: 999px; font-weight: 700; font-size: 16px;
  cursor: pointer; border: none; transition: all 0.2s ease;
}
.btn-primary { background: #fff; color: var(--blue-deep); box-shadow: 0 8px 24px rgba(0, 20, 60, 0.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(0, 20, 60, 0.38); color: var(--blue-deep); }
.btn-ghost { background: rgba(255, 255, 255, 0.1); color: #fff; border: 1px solid rgba(255, 255, 255, 0.4); }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.2); color: #fff; }
.hero-note { margin-top: 22px; font-size: 13px; color: rgba(255, 255, 255, 0.62); }
.hero-check { color: #6fe3a5; font-weight: 700; }

/* 页面小 hero（子页） */
.page-hero {
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, #072f6f 0%, #0a3d91 50%, #1662e8 100%);
  color: #fff; padding: 52px 0 58px;
}
.page-hero::before {
  content: ""; position: absolute; width: 460px; height: 460px; border-radius: 50%;
  background: radial-gradient(circle, rgba(88, 168, 255, 0.3), transparent 65%);
  top: -200px; right: -100px;
}
.page-hero-inner { position: relative; z-index: 1; }
.page-hero h1 { font-size: 34px; font-weight: 800; line-height: 1.35; letter-spacing: 0.5px; }
.page-hero .sub { margin-top: 14px; font-size: 16.5px; color: rgba(255, 255, 255, 0.88); max-width: 780px; }
.page-hero .points { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.page-hero .points span {
  background: rgba(255, 255, 255, 0.13); border: 1px solid rgba(255, 255, 255, 0.24);
  padding: 6px 14px; border-radius: 999px; font-size: 13.5px;
}
.breadcrumb { font-size: 13.5px; color: rgba(255, 255, 255, 0.65); margin-bottom: 16px; }
.breadcrumb a { color: rgba(255, 255, 255, 0.8); }
.breadcrumb a:hover { color: #fff; }

/* ---------- 平台卡片 ---------- */
.platform-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.platform-card {
  position: relative; background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 30px 24px 26px; text-align: center;
  border-top: 4px solid var(--blue); transition: all 0.25s ease; overflow: hidden;
  display: block; color: var(--ink);
}
.platform-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); color: var(--ink); }
.platform-card.dy { border-top-color: var(--dy2); }
.platform-card.ks { border-top-color: var(--ks); }
.platform-card.sph { border-top-color: var(--sph); }
.platform-card.xhs { border-top-color: var(--xhs); }
.platform-emoji {
  width: 62px; height: 62px; margin: 0 auto 16px; border-radius: 18px;
  display: flex; align-items: center; justify-content: center; font-size: 30px;
  background: var(--blue-bg);
}
.dy .platform-emoji { background: #fdeef2; }
.ks .platform-emoji { background: #fff3e8; }
.sph .platform-emoji { background: #e9f9f0; }
.xhs .platform-emoji { background: #fff0f2; }
.platform-card h3 { font-size: 19px; font-weight: 800; }
.platform-card p { color: var(--ink-3); font-size: 14px; margin-top: 8px; line-height: 1.7; }
.platform-card .go {
  display: inline-block; margin-top: 14px; font-size: 14px; font-weight: 700; color: var(--blue);
}
.dy .go { color: var(--dy2); } .ks .go { color: var(--ks); }
.sph .go { color: var(--sph); } .xhs .go { color: var(--xhs); }

/* ---------- 权益卡片 ---------- */
.benefit-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.benefit-card {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 26px 22px; transition: all 0.25s ease; border: 1px solid transparent;
}
.benefit-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: #d7e6ff; }
.benefit-icon {
  width: 50px; height: 50px; border-radius: 14px; font-size: 24px;
  background: linear-gradient(135deg, #e8f1ff, #f2f7ff);
  display: flex; align-items: center; justify-content: center; margin-bottom: 14px;
}
.benefit-card h3 { font-size: 17px; font-weight: 700; }
.benefit-card p { color: var(--ink-3); font-size: 14px; margin-top: 7px; line-height: 1.7; }

/* ---------- 流程 ---------- */
.step-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
.step-card {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 28px 22px; position: relative; transition: all 0.25s ease;
}
.step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.step-num {
  width: 42px; height: 42px; border-radius: 50%;
  background: linear-gradient(135deg, var(--blue-light), var(--blue-deep));
  color: #fff; font-weight: 800; font-size: 18px;
  display: flex; align-items: center; justify-content: center; margin-bottom: 16px;
  box-shadow: 0 5px 14px rgba(22, 98, 232, 0.35);
}
.step-card h3 { font-size: 17px; font-weight: 700; }
.step-card p { color: var(--ink-3); font-size: 14px; margin-top: 8px; line-height: 1.7; }

/* ---------- 数据带 ---------- */
.stats-band {
  background: linear-gradient(120deg, #072f6f, #1662e8);
  border-radius: 22px; color: #fff; padding: 42px 30px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center;
  box-shadow: var(--shadow-lg);
}
.stat-num { font-size: 38px; font-weight: 800; letter-spacing: 1px; }
.stat-num small { font-size: 18px; font-weight: 700; }
.stat-label { font-size: 14px; color: rgba(255, 255, 255, 0.75); margin-top: 4px; }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); }
.seo-table { width: 100%; border-collapse: collapse; font-size: 14.5px; min-width: 560px; }
.seo-table th {
  background: linear-gradient(135deg, #0a3d91, #1662e8); color: #fff;
  padding: 14px 18px; text-align: left; font-weight: 700; white-space: nowrap;
}
.seo-table td { padding: 13px 18px; border-bottom: 1px solid var(--line); color: var(--ink-2); }
.seo-table tr:last-child td { border-bottom: none; }
.seo-table tr:hover td { background: #f7faff; }
.seo-table td:first-child { font-weight: 600; color: var(--ink); white-space: nowrap; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 860px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item {
  background: var(--card); border-radius: 14px; box-shadow: var(--shadow);
  border: 1px solid var(--line); overflow: hidden;
}
.faq-item summary {
  list-style: none; cursor: pointer; padding: 18px 22px;
  font-weight: 700; font-size: 15.5px; display: flex; align-items: center; gap: 12px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::before {
  content: "Q"; flex: none; width: 26px; height: 26px; border-radius: 8px;
  background: var(--blue-bg); color: var(--blue); font-size: 14px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
}
.faq-item summary::after {
  content: "+"; margin-left: auto; font-size: 20px; color: var(--ink-3);
  transition: transform 0.2s ease; font-weight: 400;
}
.faq-item[open] summary::after { transform: rotate(45deg); color: var(--blue); }
.faq-item .faq-a {
  padding: 0 22px 18px 60px; color: var(--ink-2); font-size: 15px; line-height: 1.85;
}

/* ---------- 文章排版 ---------- */
.prose { max-width: 900px; margin: 0 auto; background: var(--card); border-radius: 20px; box-shadow: var(--shadow); padding: 44px 48px; }
.prose h2 { font-size: 24px; font-weight: 800; margin: 38px 0 16px; padding-left: 14px; border-left: 5px solid var(--blue); line-height: 1.4; }
.prose h2:first-child { margin-top: 0; }
.prose h3 { font-size: 18.5px; font-weight: 700; margin: 26px 0 12px; color: var(--blue-deep); }
.prose p { color: var(--ink-2); margin-bottom: 14px; font-size: 15.5px; }
.prose ul li, .prose ol li { color: var(--ink-2); margin-bottom: 8px; font-size: 15.5px; }
.prose strong { color: var(--ink); }
.prose table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 14.5px; }
.prose table th { background: var(--blue-bg); color: var(--blue-deep); padding: 11px 14px; text-align: left; font-weight: 700; border: 1px solid var(--line); }
.prose table td { padding: 11px 14px; border: 1px solid var(--line); color: var(--ink-2); }
.prose blockquote {
  background: var(--blue-bg); border-left: 4px solid var(--blue);
  border-radius: 0 12px 12px 0; padding: 14px 18px; margin: 16px 0;
  color: var(--ink-2); font-size: 15px;
}

/* ---------- 提示框 ---------- */
.notice {
  max-width: 1180px; margin: 0 auto;
  background: var(--warn-bg); border: 1px solid var(--warn-line);
  border-radius: 14px; padding: 18px 24px; color: var(--warn-ink); font-size: 14px; line-height: 1.9;
}
.notice strong { color: #6b4a0d; }
.section .notice { margin-top: 36px; }

/* ---------- 相关链接 ---------- */
.link-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.link-card {
  background: var(--card); border-radius: 14px; box-shadow: var(--shadow);
  padding: 20px 22px; border: 1px solid var(--line); transition: all 0.22s ease;
  display: flex; align-items: center; gap: 14px;
}
.link-card:hover { border-color: var(--blue-light); box-shadow: var(--shadow-lg); transform: translateY(-3px); }
.link-icon {
  width: 42px; height: 42px; border-radius: 12px; background: var(--blue-bg);
  display: flex; align-items: center; justify-content: center; font-size: 20px; flex: none;
}
.link-card b { display: block; font-size: 15.5px; color: var(--ink); }
.link-card span { font-size: 13px; color: var(--ink-3); }

/* ---------- CTA ---------- */
.cta-band {
  background: linear-gradient(120deg, #072f6f, #0a3d91 55%, #1662e8);
  border-radius: 24px; padding: 56px 40px; text-align: center; color: #fff;
  position: relative; overflow: hidden; box-shadow: var(--shadow-lg);
}
.cta-band::before {
  content: ""; position: absolute; width: 400px; height: 400px; border-radius: 50%;
  background: radial-gradient(circle, rgba(88, 168, 255, 0.25), transparent 65%);
  top: -160px; right: -80px;
}
.cta-band h2 { font-size: 30px; font-weight: 800; position: relative; z-index: 1; }
.cta-band p { color: rgba(255, 255, 255, 0.85); margin-top: 12px; position: relative; z-index: 1; }
.wx-id-box {
  position: relative; z-index: 1; display: inline-flex; align-items: center; gap: 14px;
  background: rgba(255, 255, 255, 0.13); border: 1px dashed rgba(255, 255, 255, 0.45);
  border-radius: 14px; padding: 14px 26px; margin-top: 26px;
}
.wx-id-box .id { font-size: 26px; font-weight: 800; letter-spacing: 2px; font-family: "SF Mono", Consolas, monospace; }
.wx-id-box .tag { font-size: 13px; color: rgba(255, 255, 255, 0.75); display: block; margin-bottom: 2px; }
.copy-btn {
  background: #fff; color: var(--blue-deep); border: none; border-radius: 9px;
  padding: 9px 18px; font-size: 14px; font-weight: 700; cursor: pointer; transition: all 0.2s;
}
.copy-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(0, 0, 0, 0.25); }

/* ---------- 页脚 ---------- */
.site-footer { background: #0c1830; color: #97a4bd; margin-top: 80px; }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1.3fr; gap: 36px; padding: 56px 0 40px;
}
.footer-brand .logo { color: #fff; margin-bottom: 14px; }
.footer-brand p { font-size: 13.5px; line-height: 1.9; color: #7c8aa6; }
.footer-col h4 { color: #fff; font-size: 15px; font-weight: 700; margin-bottom: 16px; }
.footer-col ul { list-style: none; padding: 0; }
.footer-col li { margin-bottom: 9px; }
.footer-col a { color: #8d9ab5; font-size: 13.5px; transition: color 0.15s; }
.footer-col a:hover { color: #fff; }
.footer-wx {
  background: rgba(255, 255, 255, 0.06); border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px; padding: 16px 18px; font-size: 13.5px; line-height: 2;
}
.footer-wx b { color: #fff; font-size: 17px; letter-spacing: 1px; }
.footer-legal {
  border-top: 1px solid rgba(255, 255, 255, 0.08); padding: 22px 0 30px;
  text-align: center; font-size: 12.5px; color: #66748f; line-height: 2.1;
}
.footer-legal a { color: #8d9ab5; }
.footer-legal a:hover { color: #fff; }

/* ---------- 悬浮按钮 ---------- */
.float-wx {
  position: fixed; right: 22px; bottom: 26px; z-index: 90;
  display: flex; align-items: center; gap: 9px;
  background: linear-gradient(135deg, var(--blue-light), var(--blue-deep));
  color: #fff; padding: 13px 20px; border-radius: 999px;
  font-size: 14.5px; font-weight: 700;
  box-shadow: 0 10px 28px rgba(22, 98, 232, 0.45);
  transition: all 0.2s ease;
}
.float-wx:hover { transform: translateY(-3px); color: #fff; }
.float-wx svg { width: 18px; height: 18px; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .platform-grid, .benefit-grid, .step-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-band { grid-template-columns: repeat(2, 1fr); }
  .link-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .main-nav { display: none; }
  .nav-toggle { display: block; }
  .nav-cta { display: none; }
  .main-nav.open {
    display: flex; flex-direction: column; align-items: stretch; gap: 2px;
    position: absolute; top: 64px; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-lg); padding: 12px 20px 18px;
  }
  .main-nav.open .sub {
    position: static; opacity: 1; visibility: visible; transform: none;
    box-shadow: none; border: none; padding: 0 0 0 14px; display: none;
  }
  .main-nav.open li.expanded .sub { display: block; }
  .hero h1 { font-size: 34px; }
  .hero { padding: 60px 0 72px; }
  .section-title { font-size: 27px; }
  .prose { padding: 32px 26px; }
}
@media (max-width: 600px) {
  .platform-grid, .benefit-grid, .step-grid, .link-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 28px; }
  .page-hero h1 { font-size: 26px; }
  .section { padding: 52px 0; }
  .cta-band { padding: 42px 22px; }
  .wx-id-box { flex-direction: column; gap: 10px; }
  .wx-id-box .id { font-size: 22px; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .float-wx { right: 14px; bottom: 16px; font-size: 13px; padding: 11px 16px; }
}