/* ============================================================
   售前修炼手册 · 共享样式
   纯静态站点：亮/暗双主题（CSS 变量切换），商务专业风
   ============================================================ */

:root{
  /* 品牌色 · 曜蓝 × 鎏金 */
  --brand:#1B3A5C;
  --brand-2:#2E5074;
  --gold:#C9A24B;
  --gold-soft:#F3E9CF;
  /* 页面 */
  --bg:#F3F6FA;
  --card:#FFFFFF;
  --card-soft:#FBFCFE;
  --surface-hover:#F5F8FC;
  --ink:#1A2530;
  --ink-2:#5A6B7B;
  --border:#E3E8EF;
  --shadow:0 2px 12px rgba(22,50,79,.06);
  --nav-bg:rgba(255,255,255,.96);
  /* 语义强调 */
  --red:#C0392B;
  --red-soft:#FBECEA;
  --red-ink:#7B241C;
  --blue-soft:#EAF1F8;
  --blue-line:#2B6CB0;
  --gray-step:#F0F2F5;
  --gray-line:#9AA5B1;
  --on-brand:#FFFFFF;
  --heading:#16314E;
  --subheading:#2A425C;
  /* Hero */
  --hero-bg:linear-gradient(135deg,#0E2A45 0%,#1B3A5C 55%,#2D4A6E 100%);
}

[data-theme="dark"]{
  --brand:#2A4E78;
  --brand-2:#3A5A80;
  --gold:#D5AF55;
  --gold-soft:#2A2415;
  --bg:#0F1720;
  --card:#161F2A;
  --card-soft:#1B2531;
  --surface-hover:#202B38;
  --ink:#E6EDF5;
  --ink-2:#A6B2C1;
  --border:#293545;
  --shadow:0 2px 14px rgba(0,0,0,.35);
  --nav-bg:rgba(22,31,42,.96);
  --red:#E06C5B;
  --red-soft:#2E1B18;
  --red-ink:#F0A99E;
  --blue-soft:#1B2836;
  --blue-line:#6BA3D6;
  --gray-step:#1E2732;
  --gray-line:#6B7684;
  --on-brand:#FFFFFF;
  --heading:#DCE6F2;
  --subheading:#BAC7D8;
  --hero-bg:linear-gradient(135deg,#08131F 0%,#12233A 55%,#1B3A5C 100%);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",Roboto,Arial,sans-serif;
  background:var(--bg);
  color:var(--ink);
  line-height:1.7;
  font-size:15px;
  -webkit-font-smoothing:antialiased;
  transition:background .25s ease,color .25s ease;
}
a{color:inherit;text-decoration:none}

/* ============ 站点头部 ============ */
.site-header{
  position:sticky;top:0;z-index:50;
  background:var(--nav-bg);
  backdrop-filter:blur(6px);
  border-bottom:1px solid var(--border);
}
.site-header .inner{
  max-width:1120px;margin:0 auto;padding:10px 24px;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.site-brand{
  display:inline-flex;align-items:center;gap:9px;
  font-size:16px;font-weight:700;color:var(--heading);letter-spacing:.02em;
}
.logo-mark{width:22px;height:11px;flex:0 0 auto;display:block}
.header-actions{display:flex;align-items:center;gap:14px}
.back-link{font-size:13px;color:var(--ink-2)}
.back-link:hover{color:var(--blue-line)}
.theme-btn{
  font-size:13px;font-weight:600;
  color:var(--heading);
  background:var(--card-soft);
  border:1px solid var(--border);
  padding:6px 13px;border-radius:18px;cursor:pointer;
  transition:.15s;
}
.theme-btn:hover{border-color:var(--blue-line);color:var(--blue-line)}

/* ============ Hero（首页） ============ */
.hero{
  background:var(--hero-bg);
  color:#fff;
  padding:64px 24px 56px;
  text-align:center;
  position:relative;
  overflow:hidden;
}
.hero::after{
  content:"";
  position:absolute;inset:0;
  background:radial-gradient(circle at 20% 20%,rgba(201,162,75,.14),transparent 40%),
             radial-gradient(circle at 80% 10%,rgba(43,108,176,.18),transparent 45%);
  pointer-events:none;
}
.hero .kicker{
  display:inline-block;
  font-size:12px;letter-spacing:.28em;
  color:var(--gold);
  border:1px solid rgba(201,162,75,.55);
  padding:5px 14px;border-radius:20px;
  margin-bottom:18px;
  position:relative;z-index:1;
}
.hero h1{font-size:34px;font-weight:700;letter-spacing:.02em;position:relative;z-index:1}
.hero .sub{margin-top:14px;font-size:15px;color:rgba(255,255,255,.82);position:relative;z-index:1}

/* 搜索框 */
.search-box{max-width:560px;margin:28px auto 0;position:relative;z-index:1}
.search-box input{
  width:100%;padding:14px 20px;font-size:15px;
  border:none;border-radius:28px;
  background:rgba(255,255,255,.96);color:#1A2530;
  outline:none;box-shadow:0 6px 20px rgba(0,0,0,.18);
}
.search-box input::placeholder{color:#8A97A5}

/* ============ 首页文章列表 ============ */
.home-main{max-width:1120px;margin:0 auto;padding:40px 24px 80px}
.list-head{
  display:flex;align-items:baseline;justify-content:space-between;
  margin-bottom:20px;
}
.list-head h2{font-size:20px;font-weight:700;color:var(--heading)}
.list-head .count{font-size:13px;color:var(--ink-2)}
.list-head .count b{color:var(--gold);font-weight:700}
.article-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.article-card{
  display:block;
  background:var(--card);
  border:1px solid var(--border);
  border-left:4px solid var(--brand);
  border-radius:12px;
  padding:22px 22px 20px;
  transition:transform .15s ease,box-shadow .15s ease;
}
.article-card:hover{
  transform:translateY(-3px);
  box-shadow:var(--shadow);
  border-left-color:var(--gold);
}
.ac-title{font-size:17px;font-weight:700;color:var(--heading);line-height:1.4}
.ac-excerpt{font-size:13.5px;color:var(--ink-2);margin-top:8px;line-height:1.6}
.ac-tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:14px}
.chip{
  font-size:11.5px;color:var(--blue-line);
  background:var(--blue-soft);
  padding:3px 10px;border-radius:12px;
}
.empty{
  grid-column:1/-1;text-align:center;color:var(--ink-2);
  padding:48px 0;font-size:14px;
}

/* ============ 文章页 ============ */
.article-wrap{
  max-width:1120px;margin:0 auto;padding:40px 24px 80px;
  display:grid;grid-template-columns:220px minmax(0,1fr);gap:36px;align-items:start;
}
.article-body{min-width:0}
.article-head{margin-bottom:28px;padding-bottom:24px;border-bottom:1px solid var(--border)}
.article-head h1{font-size:28px;font-weight:700;color:var(--heading);line-height:1.35}
.article-sub{margin-top:10px;font-size:14px;color:var(--ink-2)}

/* 站内章节目录 */
.toc{
  position:sticky;top:72px;
  background:var(--card);border:1px solid var(--border);border-radius:12px;
  padding:18px 16px;
}
.toc-toggle{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:8px;
  background:none;border:none;cursor:pointer;padding:0 6px 10px;
  font-size:12px;font-weight:700;color:var(--ink-2);letter-spacing:.08em;
}
.toc-toggle:hover{color:var(--blue-line)}
.toc-arrow{font-size:12px;transition:transform .2s ease}
.toc.collapsed .toc-arrow{transform:rotate(-90deg)}
.toc.collapsed .toc-nav{display:none}
.toc-nav{display:flex;flex-direction:column;gap:2px}
.toc-nav a{
  display:flex;align-items:baseline;gap:8px;
  font-size:13.5px;color:var(--ink);line-height:1.45;
  padding:6px 10px;border-radius:8px;transition:.12s;
}
.toc-nav a:hover{background:var(--blue-soft);color:var(--blue-line)}
.toc-nav a.active{background:var(--blue-soft);color:var(--blue-line);font-weight:600}
.toc-num{font-size:11px;font-weight:700;color:var(--gold);min-width:18px;text-align:right;flex:0 0 auto}

/* 上一篇 / 下一篇 */
.prev-next{display:flex;gap:16px;margin-top:40px}
.pn-link{
  flex:1;min-width:0;display:block;
  background:var(--card);border:1px solid var(--border);border-radius:12px;
  padding:16px 18px;
  transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease;
}
a.pn-link:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:var(--blue-line)}
.pn-link.next{text-align:right}
.pn-label{font-size:11.5px;color:var(--ink-2);letter-spacing:.05em}
.pn-title{font-size:14px;font-weight:700;color:var(--heading);margin-top:5px;line-height:1.45}
.pn-excerpt{
  font-size:12.5px;color:var(--ink-2);margin-top:6px;line-height:1.55;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.pn-link.disabled{opacity:.55;cursor:default}
.pn-link.disabled .pn-title{font-weight:500}

.chapter{
  background:var(--card);
  border:1px solid var(--border);
  border-left:5px solid var(--brand);
  border-radius:12px;
  padding:32px 36px;
  margin-bottom:28px;
  box-shadow:var(--shadow);
}
.chapter-head{display:flex;align-items:flex-start;gap:16px;margin-bottom:8px}
.ch-badge{
  flex:0 0 auto;
  width:46px;height:46px;border-radius:50%;
  background:var(--brand);color:var(--gold);
  display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:16px;letter-spacing:.02em;
}
.chapter-head h2{font-size:22px;font-weight:700;color:var(--heading);line-height:1.3}
.chapter-head .ch-sub{font-size:13px;color:var(--ink-2);margin-top:2px}
.ch-lead{
  font-size:14px;color:var(--ink-2);
  border-left:3px solid var(--gold);
  padding:6px 0 6px 14px;margin:10px 0 24px;
}

.sec{margin-top:24px}
.sec-title{
  display:flex;align-items:center;gap:9px;
  font-size:16px;font-weight:700;color:var(--subheading);
  margin-bottom:12px;
}
.sec-title .n{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:26px;height:26px;padding:0 6px;
  background:var(--blue-soft);color:var(--blue-line);
  border-radius:7px;font-size:12px;font-weight:700;
}

ul.plain{list-style:none}
ul.plain li{
  position:relative;padding-left:20px;margin-bottom:8px;
  color:var(--ink);font-size:14px;
}
ul.plain li::before{
  content:"";position:absolute;left:4px;top:11px;
  width:6px;height:6px;border-radius:50%;
  background:var(--gold);
}
ul.plain li strong{color:var(--subheading)}
ul.plain li .muted{color:var(--ink-2)}

.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:6px}
.mini-card{
  background:var(--card-soft);border:1px solid var(--border);border-radius:10px;
  padding:16px 18px;
}
.mini-card .k{font-size:13px;font-weight:700;color:var(--heading);margin-bottom:6px;display:flex;align-items:center;gap:7px}
.mini-card .k .dot{width:8px;height:8px;border-radius:50%;background:var(--gold);display:inline-block}
.mini-card p{font-size:13px;color:var(--ink-2)}

table{width:100%;border-collapse:collapse;margin-top:6px;font-size:13.5px}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--border);vertical-align:top}
th{background:var(--blue-soft);color:var(--heading);font-weight:700;white-space:nowrap}
tr:last-child td{border-bottom:none}
tbody tr:hover td{background:var(--surface-hover)}
td b,td strong{color:var(--subheading)}

.note{border-radius:10px;padding:14px 18px;margin:10px 0;font-size:14px}
.note-blue{background:var(--blue-soft);border-left:4px solid var(--blue-line);color:var(--subheading)}
.note-red{background:var(--red-soft);border-left:4px solid var(--red);color:var(--red-ink)}
.note-gray{background:var(--gray-step);border-left:4px solid var(--gray-line);color:var(--subheading)}
.note .tag{
  display:inline-block;font-size:11px;font-weight:700;letter-spacing:.06em;
  padding:2px 9px;border-radius:10px;margin-right:8px;
}
.note-blue .tag{background:var(--blue-line);color:#fff}
.note-red .tag{background:var(--red);color:#fff}
.note-gray .tag{background:var(--gray-line);color:#fff}
.note ul{margin:8px 0 0 18px}
.note li{margin-bottom:6px}

.steps{display:flex;flex-direction:column;gap:10px;margin-top:6px}
.step{
  display:flex;gap:14px;align-items:flex-start;
  background:var(--card-soft);border:1px solid var(--border);border-radius:10px;padding:13px 16px;
}
.step .idx{
  flex:0 0 auto;width:28px;height:28px;border-radius:50%;
  background:var(--brand);color:var(--gold);
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px;
}
.step .body b{color:var(--subheading);font-size:14px}
.step .body p{font-size:13px;color:var(--ink-2);margin-top:2px}

.tiers{display:flex;flex-direction:column;gap:14px;margin-top:6px}
.tier{border:1px solid var(--border);border-radius:10px;overflow:hidden}
.tier-head{
  background:var(--brand);color:var(--on-brand);padding:10px 18px;
  font-weight:700;font-size:14px;display:flex;align-items:center;gap:10px;
}
.tier-head .rank{color:var(--gold);font-size:12px;letter-spacing:.1em}
.tier-body{padding:14px 18px;background:var(--card-soft)}
.tier-body ul{list-style:none;margin:0}
.tier-body li{position:relative;padding-left:18px;margin-bottom:7px;font-size:13.5px;color:var(--ink)}
.tier-body li::before{content:"";position:absolute;left:3px;top:11px;width:6px;height:6px;border-radius:50%;background:var(--gold)}
.tier-body li b{color:var(--subheading)}

.site-footer{
  text-align:center;color:var(--ink-2);font-size:12.5px;
  padding:28px 24px 40px;border-top:1px solid var(--border);background:var(--card);
}

/* 响应式 */
@media(max-width:900px){
  .article-wrap{grid-template-columns:1fr}
  .toc{position:static}
  .prev-next{flex-direction:column}
  .grid3{grid-template-columns:repeat(2,1fr)}
  .site-header .inner{padding:9px 16px}
}
@media(max-width:760px){
  .hero h1{font-size:26px}
  .grid3{grid-template-columns:1fr}
  .chapter{padding:24px 20px}
  .article-head h1{font-size:23px}
  .hero{padding:44px 18px 40px}
  th,td{padding:9px 10px}
}

/* ============================================================
   售前工作流程 · 交互式泳道图（SVG）
   ============================================================ */
.flowchart-wrap{
  overflow-x:auto;margin:18px 0 4px;
  border:1px solid var(--border);border-radius:12px;
  background:var(--card);box-shadow:var(--shadow);
}
.flowchart-wrap svg{display:block;min-width:900px;width:100%;height:auto}

.fc-lane-bg{fill:var(--card-soft)}
.fc-lane-bg.alt{fill:var(--surface-hover)}
.fc-divider{stroke:var(--border);stroke-width:1}
.fc-header{fill:var(--brand)}
.fc-lane-title{fill:var(--on-brand);font-size:15px;font-weight:700;text-anchor:middle}
.fc-arrow{fill:var(--gray-line)}

.fc-node{cursor:pointer}
.fc-proc rect{fill:var(--blue-soft);stroke:var(--blue-line);stroke-width:1.4}
.fc-start rect{fill:var(--gold-soft);stroke:var(--gold);stroke-width:1.6}
.fc-term rect{fill:var(--red-soft);stroke:var(--red);stroke-width:1.6}
.fc-dec polygon{fill:var(--gold-soft);stroke:var(--gold);stroke-width:1.6}
.fc-node-text{fill:var(--ink);font-weight:600;text-anchor:middle}
.fc-dec-text{fill:var(--subheading)}

.fc-edge{fill:none;stroke:var(--gray-line);stroke-width:1.6}
.fc-edge-label{fill:var(--ink-2);font-size:12px;text-anchor:middle}
.fc-doc{fill:var(--ink-2);font-size:11.5px;text-anchor:middle}
.fc-note{fill:var(--gold);font-size:11.5px;font-style:italic;text-anchor:middle}

/* hover 高亮：进入 .fc-on 后，非相关节点/连线淡出 */
.fc-on .fc-node,.fc-on .fc-edge{opacity:.22}
.fc-on .fc-node.fc-hl,.fc-on .fc-edge.fc-hl{opacity:1}
.fc-node.fc-hl rect,.fc-node.fc-hl polygon{stroke-width:2.6}

/* ============================================================
   动效：页面进入动画 · 页间切换过渡 · 减少动效偏好
   ============================================================ */
@keyframes rise{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}

/* 页间切换：淡出（配合 js/transition.js） */
body{transition:opacity .18s ease,transform .18s ease}
html.page-leaving body{opacity:0;transform:translateY(-6px)}

/* 首页进入 */
.hero .kicker,.hero h1,.hero .sub,.hero .search-box{animation:rise .5s ease both}
.hero h1{animation-delay:.05s}
.hero .sub{animation-delay:.12s}
.hero .search-box{animation-delay:.2s}
.list-head{animation:rise .5s .15s ease both}
.article-card{animation:rise .5s ease both}
.article-card:nth-of-type(2){animation-delay:.06s}
.article-card:nth-of-type(3){animation-delay:.12s}
.article-card:nth-of-type(4){animation-delay:.18s}
.article-card:nth-of-type(5){animation-delay:.24s}
.article-card:nth-of-type(6){animation-delay:.3s}
.article-card:nth-of-type(7){animation-delay:.36s}
.article-card:nth-of-type(8){animation-delay:.42s}

/* 文章页进入 */
.toc{animation:rise .5s .05s ease both}
.article-head{animation:rise .45s ease both}
.chapter{animation:rise .5s ease both}
.chapter:nth-of-type(2){animation-delay:.06s}
.chapter:nth-of-type(3){animation-delay:.12s}
.chapter:nth-of-type(4){animation-delay:.18s}
.chapter:nth-of-type(5){animation-delay:.24s}
.chapter:nth-of-type(6){animation-delay:.3s}
.prev-next{animation:rise .5s .2s ease both}

/* 减少动效偏好 */
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
}

@media(max-width:480px){
  .hero h1{font-size:22px}
  .site-brand{font-size:15px}
  .logo-mark{width:20px;height:10px}
  .header-actions{gap:8px}
  .back-link{font-size:12px}
}

/* 打印 */
@media print{
  .site-header{display:none}
  .hero{background:#0E2A45!important;-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .chapter{box-shadow:none;break-inside:avoid}
  body{background:#fff}
}