/* ==========================================================================
   中策策敏 AI · 生态系统专题页设计系统（白色主题版）
   配色对齐 GEO 智能推广平台 (zcgeo.china0001.com.cn)
   背景: linear-gradient(180deg, #ffffff 0%, #f0f4ff 70%, #e8f0fe 100%)
   ========================================================================== */

:root {
  /* 页面背景 —— 对齐 GEO 平台 */
  --bg-page: #ffffff;
  --bg-card: rgba(255, 255, 255, 0.78);
  --bg-card-solid: #ffffff;
  --bg-card-hover: rgba(255, 255, 255, 0.96);
  --bg-panel: rgba(255, 255, 255, 0.56);
  --bg-soft: #f3f7ff;
  --bg-soft-2: #eaf2ff;
  --bg-elevated: #ffffff;

  /* 品牌蓝 —— 取自 GEO 平台 #4a8eff / #008fd5 / #0000ee */
  --blue: #4a8eff;
  --blue-deep: #2563eb;
  --blue-strong: #0000ee;
  --blue-mid: #3b82f6;
  --cyan: #008fd5;
  --cyan-bright: #7eb8ff;
  --blue-pale: #dbeaff;
  --blue-pale-2: #e8f0fe;
  --blue-pale-3: #e0ecff;

  /* 文字 —— 取自 GEO 平台 #333 / #606266 / #909399 */
  --text: #1f2937;
  --text-strong: #333333;
  --text-sub: #4b5563;
  --text-muted: #606266;
  --text-dim: #909399;
  --text-faint: #b4b8bf;

  /* 线条 */
  --line: rgba(74, 142, 255, 0.16);
  --line-soft: rgba(0, 0, 0, 0.07);
  --line-strong: rgba(0, 0, 0, 0.13);
  --line-blue: rgba(74, 142, 255, 0.38);

  /* 功能色 */
  --red: #f56c6c;
  --green: #16b364;
  --amber: #f5a623;

  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 20px;

  --maxw: 1200px;
  --shadow-s: 0 2px 12px rgba(0, 0, 0, 0.06);
  --shadow-m: 0 8px 28px rgba(74, 142, 255, 0.13);
  --shadow: 0 14px 40px rgba(74, 142, 255, 0.16);
}

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

html { scroll-behavior: smooth; }

/* 页面背景：白 → 极浅蓝，铺满且不重复 */
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(180deg, #ffffff 0%, #f0f4ff 70%, #e8f0fe 100%);
  background-repeat: no-repeat;
  background-size: cover;
  background-attachment: fixed;
  color: var(--text-muted);
  line-height: 1.75;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-in {
  max-width: var(--maxw); margin: 0 auto; padding: 0 24px;
  height: 64px; display: flex; align-items: center; gap: 28px;
}
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 7px; display: block;
  box-shadow: 0 4px 12px rgba(74, 142, 255, 0.28);
}
.brand-txt { font-size: 15px; font-weight: 600; color: var(--text-strong); letter-spacing: .3px; }
.brand-txt span { color: var(--blue); }

.nav-menu { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.nav-menu a {
  font-size: 13.5px; color: var(--text-muted); padding: 7px 13px;
  border-radius: 99px; transition: all .2s; white-space: nowrap;
}
.nav-menu a:hover { color: var(--blue-strong); background: var(--blue-pale); }
.nav-menu a.on {
  color: var(--blue-strong); background: var(--blue-pale);
  border: 1px solid var(--line-blue); font-weight: 500;
}
.nav-back {
  font-size: 13px; color: var(--text-dim); border-left: 1px solid var(--line-strong);
  padding-left: 20px; white-space: nowrap;
}
.nav-back:hover { color: var(--blue); }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 68px 0 76px; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; top: -240px; left: 50%; transform: translateX(-50%);
  width: 900px; height: 520px; pointer-events: none;
  background: radial-gradient(ellipse at center, rgba(74, 142, 255, .16), transparent 68%);
}
.hero-in { position: relative; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; text-align: center; }

.hero h1 {
  font-size: 44px; line-height: 1.28; color: var(--text);
  font-weight: 700; letter-spacing: -.5px; margin-bottom: 20px;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(100deg, var(--blue-deep), var(--blue));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-lead {
  font-size: 16.5px; color: var(--text-muted); max-width: 760px;
  line-height: 1.85; margin: 0 auto 34px;
}
.hero-lead strong { color: var(--text-strong); font-weight: 600; }

/* Hero 关键结论 —— GEO 规范：首屏给出直接答案 */
.answer {
  border: 1px solid var(--line-blue);
  border-left: 3px solid var(--blue);
  background: linear-gradient(135deg, rgba(74, 142, 255, .11), rgba(255, 255, 255, 0.6) 70%);
  padding: 18px 28px; border-radius: var(--radius-m);
  max-width: 860px; margin: 0 auto 34px;
}
.answer-t {
  font-size: 12px; color: var(--blue-deep); letter-spacing: 1.5px;
  margin-bottom: 8px; font-weight: 600;
}
.answer p { font-size: 15.5px; color: var(--text-strong); margin: 0; }

.hero-btns { display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 28px; border-radius: 99px; font-size: 14.5px;
  font-weight: 500; transition: all .22s; cursor: pointer; border: none;
}
.btn-p {
  background: linear-gradient(135deg, var(--blue), var(--blue-deep));
  color: #fff; box-shadow: 0 8px 22px rgba(74, 142, 255, .34);
}
.btn-p:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(74, 142, 255, .46); }
.btn-g {
  background: rgba(255, 255, 255, 0.8); color: var(--text-strong);
  border: 1px solid var(--line-strong);
}
.btn-g:hover { border-color: var(--blue); color: var(--blue-strong); background: #fff; }

/* ---------- 数据条 ---------- */
.stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 1px; background: var(--line);
  border: 1px solid var(--line); border-radius: var(--radius-m);
  overflow: hidden; margin-top: 52px;
  box-shadow: var(--shadow-s);
}
.stat { background: rgba(255, 255, 255, 0.86); padding: 26px 24px; }
.stat-n {
  font-size: 30px; font-weight: 700; color: var(--blue-deep);
  line-height: 1.15; letter-spacing: -.5px;
}
.stat-n small { font-size: 15px; font-weight: 500; margin-left: 2px; }
.stat-l { font-size: 13px; color: var(--text-dim); margin-top: 6px; }

/* ---------- 通用区块 ---------- */
.sec { padding: 76px 0; }
.sec-alt {
  background: rgba(255, 255, 255, 0.5);
  border-top: 1px solid var(--line-soft); border-bottom: 1px solid var(--line-soft);
}

.sec-h { margin-bottom: 44px; max-width: 800px; }
.sec-h .kicker {
  font-size: 12px; letter-spacing: 2.5px; color: var(--blue);
  font-weight: 600; text-transform: uppercase; margin-bottom: 12px;
}
.sec-h h2 {
  font-size: 31px; color: var(--text-strong); font-weight: 700;
  line-height: 1.35; letter-spacing: -.3px; margin-bottom: 14px;
}
.sec-h p { font-size: 15px; color: var(--text-muted); margin: 0; }

/* 问句式标题 —— GEO 规范 */
.q-h {
  font-size: 21px; color: var(--text-strong); font-weight: 600;
  margin: 44px 0 16px; padding-left: 16px;
  border-left: 3px solid var(--blue); line-height: 1.5;
}

/* ---------- 卡片 ---------- */
.grid { display: grid; gap: 20px; }
.g2 { grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); }
.g3 { grid-template-columns: repeat(auto-fit, minmax(288px, 1fr)); }
.g4 { grid-template-columns: repeat(auto-fit, minmax(224px, 1fr)); }

.card {
  background: var(--bg-card); border: 1px solid var(--line-soft);
  border-radius: var(--radius-m); padding: 28px;
  transition: all .25s; position: relative; overflow: hidden;
  box-shadow: var(--shadow-s);
  backdrop-filter: blur(10px);
}
.card:hover {
  border-color: var(--line-blue); background: var(--bg-card-solid);
  transform: translateY(-3px); box-shadow: var(--shadow-m);
}
.card-ico {
  width: 42px; height: 42px; border-radius: 11px;
  background: var(--blue-pale); border: 1px solid var(--line-blue);
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 700; color: var(--blue-deep); margin-bottom: 18px;
}
.card h3 { font-size: 17px; color: var(--text-strong); font-weight: 600; margin-bottom: 12px; line-height: 1.5; }
.card p { font-size: 14px; color: var(--text-muted); margin: 0; line-height: 1.8; }
.card-num {
  position: absolute; top: 20px; right: 24px;
  font-size: 40px; font-weight: 800; color: rgba(74, 142, 255, .1);
  line-height: 1;
}

/* ---------- 表格 ---------- */
.tbl-wrap {
  overflow-x: auto; border: 1px solid var(--line-soft);
  border-radius: var(--radius-m); background: rgba(255, 255, 255, 0.86);
  box-shadow: var(--shadow-s);
}
table { width: 100%; border-collapse: collapse; min-width: 620px; }
thead th {
  background: var(--blue-pale); color: var(--text-strong);
  font-size: 13.5px; font-weight: 600; text-align: left;
  padding: 15px 20px; white-space: nowrap;
  border-bottom: 1px solid var(--line-blue);
}
tbody td {
  padding: 15px 20px; font-size: 14px; color: var(--text-muted);
  border-bottom: 1px solid var(--line-soft); vertical-align: top;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: rgba(74, 142, 255, .05); }
tbody td:first-child { color: var(--text-strong); font-weight: 600; }
td .hl { color: var(--blue-deep); font-weight: 600; }

/* ---------- 步骤流程 ---------- */
.flow { display: flex; flex-direction: column; gap: 0; }
.step {
  display: grid; grid-template-columns: 62px 1fr; gap: 22px;
  padding-bottom: 34px; position: relative;
}
.step:last-child { padding-bottom: 0; }
.step::before {
  content: ""; position: absolute; left: 30px; top: 62px; bottom: 0;
  width: 1px; background: linear-gradient(180deg, var(--line-blue), transparent);
}
.step:last-child::before { display: none; }
.step-n {
  width: 62px; height: 62px; border-radius: 16px; flex-shrink: 0;
  background: #fff; border: 1px solid var(--line-blue);
  display: flex; align-items: center; justify-content: center;
  font-size: 19px; font-weight: 700; color: var(--blue-deep);
  box-shadow: var(--shadow-s);
}
.step-b h3 { font-size: 16.5px; color: var(--text-strong); font-weight: 600; margin: 6px 0 8px; }
.step-b p { font-size: 14px; color: var(--text-muted); margin: 0; }
.step-b .meta {
  display: inline-block; font-size: 12px; color: var(--blue-deep);
  background: var(--blue-pale); border: 1px solid var(--line-blue);
  border-radius: 99px; padding: 3px 12px; margin-top: 10px;
}

/* ---------- 对比块 ---------- */
.vs { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.vs-col {
  border-radius: var(--radius-m); padding: 28px;
  border: 1px solid var(--line-soft); background: rgba(255, 255, 255, 0.8);
  box-shadow: var(--shadow-s);
}
.vs-col.bad { border-color: rgba(245, 108, 108, .3); }
.vs-col.good { border-color: var(--line-blue); background: rgba(255, 255, 255, 0.95); }
.vs-h {
  font-size: 15px; font-weight: 600; margin-bottom: 18px;
  display: flex; align-items: center; gap: 9px; color: var(--text-strong);
}
.vs-h .dot { width: 8px; height: 8px; border-radius: 50%; }
.vs-col.bad .dot { background: var(--red); }
.vs-col.good .dot { background: var(--blue); box-shadow: 0 0 8px rgba(74, 142, 255, .7); }
.vs-col ul li {
  font-size: 14px; color: var(--text-muted); padding: 9px 0 9px 22px;
  position: relative; border-bottom: 1px dashed var(--line-soft);
}
.vs-col ul li:last-child { border-bottom: none; }
.vs-col ul li::before {
  content: ""; position: absolute; left: 4px; top: 17px;
  width: 5px; height: 5px; border-radius: 50%; background: var(--text-faint);
}
.vs-col.good ul li::before { background: var(--blue); }

/* ---------- 指标环 ---------- */
.rings { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 20px; }
.ring { text-align: center; padding: 26px 16px; background: rgba(255,255,255,.82); border: 1px solid var(--line-soft); border-radius: var(--radius-m); box-shadow: var(--shadow-s); }
.ring-v { font-size: 27px; font-weight: 700; color: var(--blue-deep); }
.ring-l { font-size: 13px; color: var(--text-muted); margin-top: 6px; }
.ring-d { font-size: 12px; color: var(--text-dim); margin-top: 3px; }

/* ---------- 进度条 ---------- */
.bars { display: flex; flex-direction: column; gap: 18px; }
.bar-row { display: grid; grid-template-columns: 140px 1fr 56px; gap: 16px; align-items: center; }
.bar-name { font-size: 13.5px; color: var(--text-strong); }
.bar-track { height: 7px; border-radius: 99px; background: var(--blue-pale-3); overflow: hidden; }
.bar-fill { height: 100%; border-radius: 99px; background: linear-gradient(90deg, var(--blue), var(--blue-deep)); }
.bar-val { font-size: 13.5px; color: var(--blue-deep); text-align: right; font-weight: 600; }

/* ---------- FAQ ---------- */
.faq { display: flex; flex-direction: column; gap: 12px; }
.faq details {
  background: rgba(255, 255, 255, 0.88); border: 1px solid var(--line-soft);
  border-radius: var(--radius-m); overflow: hidden;
  box-shadow: var(--shadow-s);
}
.faq details[open] { border-color: var(--line-blue); }
.faq summary {
  padding: 19px 26px; font-size: 15.5px; color: var(--text-strong);
  cursor: pointer; font-weight: 600; list-style: none;
  display: flex; align-items: center; gap: 14px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before {
  content: "Q"; flex-shrink: 0;
  width: 24px; height: 24px; border-radius: 7px;
  background: var(--blue-pale); color: var(--blue-deep);
  font-size: 12px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.faq summary::after {
  content: "+"; margin-left: auto; color: var(--text-dim);
  font-size: 20px; font-weight: 300; transition: transform .2s;
}
.faq details[open] summary::after { transform: rotate(45deg); color: var(--blue); }
.faq-a {
  padding: 0 26px 22px 64px; font-size: 14.5px;
  color: var(--text-muted); line-height: 1.85;
}

/* ---------- 文章列表 ---------- */
.posts { display: grid; gap: 16px; }
.post {
  display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center;
  padding: 24px 28px; background: rgba(255, 255, 255, 0.86);
  border: 1px solid var(--line-soft); border-radius: var(--radius-m);
  transition: all .22s; box-shadow: var(--shadow-s);
}
.post:hover { border-color: var(--line-blue); background: #fff; transform: translateX(4px); box-shadow: var(--shadow-m); }
.post-cat {
  display: inline-block; font-size: 11.5px; color: var(--blue-deep);
  background: var(--blue-pale); border-radius: 99px;
  padding: 2px 11px; margin-bottom: 10px; font-weight: 500;
}
.post h3 { font-size: 16px; color: var(--text-strong); font-weight: 600; margin-bottom: 8px; line-height: 1.55; }
.post p { font-size: 13.5px; color: var(--text-muted); margin: 0;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.post-d { font-size: 12.5px; color: var(--text-dim); white-space: nowrap; }

/* 筛选标签 */
.filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 32px; }
.filters button {
  background: rgba(255, 255, 255, 0.85); border: 1px solid var(--line-strong);
  color: var(--text-muted); font-size: 13px; padding: 8px 18px;
  border-radius: 99px; cursor: pointer; transition: all .2s;
  font-family: inherit;
}
.filters button:hover { border-color: var(--blue); color: var(--blue-strong); }
.filters button.on {
  background: var(--blue-pale); border-color: var(--line-blue);
  color: var(--blue-strong); font-weight: 600;
}

/* ---------- 案例 ---------- */
.cases { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 20px; }
.case {
  background: rgba(255, 255, 255, 0.86); border: 1px solid var(--line-soft);
  border-radius: var(--radius-m); padding: 28px; transition: all .25s;
  display: flex; flex-direction: column; box-shadow: var(--shadow-s);
}
.case:hover { border-color: var(--line-blue); transform: translateY(-4px); box-shadow: var(--shadow-m); }
.case-top { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; }
.case-logo {
  width: 44px; height: 44px; border-radius: 12px; flex-shrink: 0;
  background: var(--blue-pale); border: 1px solid var(--line-blue);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; font-weight: 700; color: var(--blue-deep);
}
.case-ind { font-size: 12px; color: var(--text-dim); }
.case h3 { font-size: 16.5px; color: var(--text-strong); font-weight: 600; margin-bottom: 10px; }
.case p { font-size: 13.5px; color: var(--text-muted); line-height: 1.8; flex: 1; margin-bottom: 20px; }
.case-res { display: flex; gap: 22px; padding-top: 18px; border-top: 1px solid var(--line-soft); }
.case-res div { font-size: 12px; color: var(--text-dim); }
.case-res b { display: block; font-size: 19px; color: var(--blue-deep); font-weight: 700; margin-bottom: 2px; }

/* ---------- 平台徽标 ---------- */
.plats { display: grid; grid-template-columns: repeat(auto-fit, minmax(148px, 1fr)); gap: 14px; }
.plat {
  background: rgba(255, 255, 255, 0.86); border: 1px solid var(--line-soft);
  border-radius: var(--radius-m); padding: 20px 16px; text-align: center;
  transition: all .22s; box-shadow: var(--shadow-s);
}
.plat:hover { border-color: var(--line-blue); background: #fff; }
.plat-i {
  width: 40px; height: 40px; border-radius: 11px; margin: 0 auto 12px;
  background: var(--blue-pale); border: 1px solid var(--line-blue);
  display: flex; align-items: center; justify-content: center;
  font-size: 17px; font-weight: 700; color: var(--blue-deep);
}
.plat-n { font-size: 14px; color: var(--text-strong); font-weight: 600; }
.plat-d { font-size: 11.5px; color: var(--text-dim); margin-top: 3px; }

/* ---------- CTA ---------- */
.cta {
  background: linear-gradient(135deg, rgba(74, 142, 255, .14), rgba(255, 255, 255, .9) 60%);
  border: 1px solid var(--line-blue); border-radius: var(--radius-l);
  padding: 52px 48px; text-align: center;
  box-shadow: var(--shadow-m);
}
.cta h2 { font-size: 27px; color: var(--text-strong); font-weight: 700; margin-bottom: 14px; }
.cta p { font-size: 15px; color: var(--text-muted); margin-bottom: 30px; max-width: 620px; margin-left: auto; margin-right: auto; }

/* ---------- 相关专题 ---------- */
.rel { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }
.rel a {
  background: rgba(255, 255, 255, 0.84); border: 1px solid var(--line-soft);
  border-radius: var(--radius-m); padding: 20px 22px; transition: all .22s;
  display: block; box-shadow: var(--shadow-s);
}
.rel a:hover { border-color: var(--line-blue); background: #fff; transform: translateY(-2px); }
.rel-n { font-size: 14.5px; color: var(--text-strong); font-weight: 600; margin-bottom: 5px; }
.rel-d { font-size: 12.5px; color: var(--text-dim); }

/* ---------- 页脚 ---------- */
.foot {
  border-top: 1px solid var(--line); padding: 52px 0 34px;
  background: rgba(255, 255, 255, 0.72);
}
.foot-in { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.foot-top { display: grid; grid-template-columns: 1.4fr 2.6fr; gap: 48px; margin-bottom: 40px; }
.foot-about p { font-size: 13px; color: var(--text-dim); line-height: 1.9; margin-top: 14px; }
.foot-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 30px; }
.foot-col h4 { font-size: 13.5px; color: var(--text-strong); font-weight: 600; margin-bottom: 15px; }
.foot-col a { display: block; font-size: 13px; color: var(--text-dim); padding: 5px 0; transition: color .2s; }
.foot-col a:hover { color: var(--blue); }
.foot-bot {
  border-top: 1px solid var(--line-soft); padding-top: 24px;
  display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  font-size: 12.5px; color: var(--text-dim);
}

/* ---------- 工具类 ---------- */
.hl-t { color: var(--blue-deep); font-weight: 600; }
.mono { font-family: "SF Mono", Consolas, Monaco, monospace; font-size: 13px; }
.note {
  font-size: 13px; color: var(--text-dim);
  border-left: 2px solid var(--line-blue);
  padding: 4px 0 4px 16px; margin-top: 22px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .nav-menu { display: none; }
  .foot-top { grid-template-columns: 1fr; gap: 34px; }
  .hero h1 { font-size: 32px; }
  .sec-h h2 { font-size: 24px; }
  .sec { padding: 54px 0; }
  .hero { padding: 46px 0 54px; }
  .cta { padding: 38px 24px; }
}
@media (max-width: 640px) {
  .hero h1 { font-size: 27px; }
  .stat-n { font-size: 25px; }
  .bar-row { grid-template-columns: 92px 1fr 46px; gap: 10px; }
  .post { grid-template-columns: 1fr; gap: 12px; }
  .card { padding: 22px; }
  .nav-in, .hero-in { padding-left: 18px; padding-right: 18px; }
}