:root{
  --bg:#0a0f1c;
  --bg-2:#0e1626;
  --panel:#111c30;
  --panel-2:#16243c;
  --line:#1f3047;
  --text:#e7eef7;
  --text-dim:#9fb2cc;
  --text-mute:#6c819b;
  --brand:#19d3a2;        /* 能源青绿 */
  --brand-2:#2b8cff;      /* 科技蓝 */
  --brand-grad:linear-gradient(120deg,#19d3a2 0%,#2b8cff 100%);
  --warn:#ffb347;
  --radius:14px;
  --maxw:1180px;
  --serif:"Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--serif);background:var(--bg);color:var(--text);
  line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased;
}
a{color:var(--brand-2);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}
.container{max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* ── 顶部导航 ── */
.site-header{
  position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);
  background:rgba(10,15,28,.86);border-bottom:1px solid var(--line);
}
.site-header .bar{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.5px;color:var(--text)}
.logo .mark{
  width:36px;height:36px;border-radius:9px;background:var(--brand-grad);
  display:grid;place-items:center;color:#04121a;font-weight:900;font-size:18px;
  box-shadow:0 0 18px rgba(25,211,162,.35);
}
.logo small{display:block;font-weight:500;color:var(--text-mute);font-size:12px;letter-spacing:.5px}
.nav{display:flex;gap:26px;align-items:center}
.nav a{color:var(--text-dim);font-size:15px;font-weight:600}
.nav a:hover,.nav a.active{color:var(--brand);text-decoration:none}
.nav .btn-quote{
  padding:9px 18px;border-radius:999px;background:var(--brand-grad);color:#04121a;
  font-weight:800;box-shadow:0 6px 18px rgba(43,140,255,.28)
}
.menu-toggle{display:none;background:none;border:1px solid var(--line);color:var(--text);border-radius:8px;padding:8px 12px}

/* ── Hero / 首屏 ── */
.hero{
  position:relative;overflow:hidden;padding:96px 0 84px;
  background:radial-gradient(1200px 600px at 80% -10%,rgba(43,140,255,.18),transparent 60%),
             radial-gradient(900px 500px at 0% 20%,rgba(25,211,162,.16),transparent 55%);
  border-bottom:1px solid var(--line);
}
.hero h1{font-size:clamp(30px,5vw,52px);line-height:1.18;margin:0 0 18px;font-weight:900}
.hero h1 .accent{background:var(--brand-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:clamp(16px,2vw,19px);color:var(--text-dim);max-width:760px;margin:0 0 28px}
.hero .cta{display:flex;gap:14px;flex-wrap:wrap}
.hero .cta a{padding:13px 24px;border-radius:999px;font-weight:800}
.btn-primary{background:var(--brand-grad);color:#04121a;box-shadow:0 8px 24px rgba(43,140,255,.3)}
.btn-ghost{border:1px solid var(--line);color:var(--text)}
.stats{display:flex;gap:36px;margin-top:46px;flex-wrap:wrap}
.stats .s b{display:block;font-size:30px;background:var(--brand-grad);-webkit-background-clip:text;background-clip:text;color:transparent;font-weight:900}
.stats .s span{color:var(--text-mute);font-size:13px}

/* ── 区块通用 ── */
section.block{padding:72px 0;border-bottom:1px solid var(--line)}
.section-title{font-size:clamp(22px,3vw,32px);font-weight:900;margin:0 0 8px}
.section-sub{color:var(--text-dim);margin:0 0 34px;max-width:760px}
.eyebrow{color:var(--brand);font-weight:800;letter-spacing:2px;font-size:13px;text-transform:uppercase}

/* ── 卡片网格 ── */
.grid{display:grid;gap:20px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.card{
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.25s;
}
.card:hover{border-color:var(--brand);transform:translateY(-3px);box-shadow:0 14px 36px rgba(0,0,0,.35)}
.card h3{margin:0 0 10px;font-size:19px}
.card p{color:var(--text-dim);font-size:14.5px;margin:0 0 14px}
.card .tag{display:inline-block;font-size:12px;color:var(--brand);border:1px solid var(--line);padding:3px 10px;border-radius:999px;margin-right:6px}
.card a.more{color:var(--brand-2);font-weight:700;font-size:14px}

/* ── 流程条 ── */
.flow{display:flex;gap:12px;flex-wrap:wrap}
.flow .step{flex:1;min-width:150px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px}
.flow .step b{color:var(--brand);display:block;margin-bottom:6px}

/* ── 面包屑 ── */
.breadcrumb{padding:16px 0;font-size:13.5px;color:var(--text-mute);display:flex;justify-content:center;flex-wrap:wrap;text-align:center}
.breadcrumb a{color:var(--text-dim)}
.breadcrumb span.sep{margin:0 8px;color:var(--line)}

/* ── 详情页布局 ── */
.detail-wrap{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:40px;align-items:start;padding:30px 0 72px}
.article-main{max-width:760px}
.article-main h1{font-size:clamp(26px,3.5vw,38px);line-height:1.25;margin:0 0 18px;font-weight:900}
.article-main h2{font-size:23px;margin:38px 0 14px;padding-top:8px;border-top:1px solid var(--line);font-weight:800;scroll-margin-top:90px}
.article-main h3{font-size:18px;margin:26px 0 10px;color:var(--text);scroll-margin-top:90px}
.article-main p{color:#d4deec;margin:0 0 16px}
.article-main ul,.article-main ol{color:#d4deec;margin:0 0 16px;padding-left:22px}
.article-main li{margin:6px 0}
.article-main blockquote{
  border-left:3px solid var(--brand);background:var(--panel);padding:14px 18px;
  border-radius:0 10px 10px 0;color:var(--text-dim);margin:0 0 18px
}
.article-main code{background:var(--panel-2);padding:2px 7px;border-radius:6px;font-size:14px;color:#9fe9d2}
.article-main pre{background:#060c16;border:1px solid var(--line);border-radius:10px;padding:16px;overflow:auto}
.article-main pre code{background:none;padding:0;color:#bfe9ff}
table.data{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px;background:var(--panel);border-radius:10px;overflow:hidden}
table.data th,table.data td{border:1px solid var(--line);padding:11px 14px;text-align:left}
table.data th{background:var(--panel-2);color:var(--text);font-weight:700}
table.data tr:nth-child(even) td{background:rgba(255,255,255,.02)}

/* 摘要块 / 结论块 / callout */
.summary-block{
  background:linear-gradient(180deg,rgba(25,211,162,.08),rgba(43,140,255,.06));
  border:1px solid var(--line);border-left:4px solid var(--brand);
  border-radius:12px;padding:18px 22px;margin:0 0 26px;color:#dbe7f4
}
.summary-block b{color:var(--brand)}
.keywords{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px}
.keywords .tag-text{background:var(--panel-2);border:1px solid var(--line);color:var(--text-dim);padding:5px 12px;border-radius:999px;font-size:13px}
.update-time{font-size:13px;color:var(--text-mute);margin:0 0 18px}
.conclusion{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px 22px;margin:24px 0}
.conclusion h3{margin-top:0;border:none;padding:0}
.conclusion ol{margin:0}
.callout-experience{background:rgba(255,179,71,.08);border:1px solid rgba(255,179,71,.3);border-left:4px solid var(--warn);border-radius:12px;padding:16px 20px;margin:24px 0;color:#f3e2c4}

/* 相关阅读 */
.related{margin:40px 0 0;padding-top:24px;border-top:1px solid var(--line)}
.related h3{font-size:18px;margin:0 0 14px}
.related a{display:block;padding:12px 16px;background:var(--panel);border:1px solid var(--line);border-radius:10px;margin-bottom:10px;color:var(--text)}
.related a:hover{border-color:var(--brand);text-decoration:none}
.related a small{display:block;color:var(--text-mute);font-size:13px;margin-top:4px}

/* ── TOC 悬浮 ── */
.toc-aside{position:sticky;top:90px;max-height:calc(100vh - 110px);overflow-y:auto}
.toc-aside h4{font-size:13px;color:var(--text-mute);text-transform:uppercase;letter-spacing:1.5px;margin:0 0 12px}
.toc-aside ol{list-style:none;margin:0;padding:0;counter-reset:t}
.toc-aside li{margin:7px 0;font-size:14px;line-height:1.4}
.toc-aside a{color:var(--text-dim)}
.toc-aside a:hover{color:var(--brand)}

/* ── FAQ ── */
.faq details{border:1px solid var(--line);border-radius:10px;margin:10px 0;background:var(--panel);overflow:hidden}
.faq details summary{cursor:pointer;padding:14px 18px;font-weight:700;color:var(--text);list-style:none}
.faq details summary::-webkit-details-marker{display:none}
.faq details summary::before{content:"+";color:var(--brand);font-weight:900;margin-right:10px}
.faq details[open] summary::before{content:"−"}
.faq details div{padding:0 18px 16px;color:#d4deec}

/* ── 左侧胶囊（名片 + 回顶）── */
.side-dock{position:fixed;left:14px;top:50%;transform:translateY(-50%);z-index:60;display:flex;flex-direction:column;gap:12px}
.side-dock .pill{
  width:46px;height:46px;border-radius:999px;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:2px;background:rgba(17,28,48,.92);border:1px solid var(--line);color:var(--text);cursor:pointer;
  box-shadow:0 6px 20px rgba(0,0,0,.4);transition:.2s;writing-mode:horizontal-tb
}
.side-dock .pill:hover{border-color:var(--brand);color:var(--brand);transform:scale(1.06)}
.side-dock .pill svg{width:18px;height:18px}
.side-dock .pill span{font-size:10px;line-height:1}

/* 名片弹层 */
.card-modal{position:fixed;inset:0;z-index:200;display:none;align-items:center;justify-content:center;background:rgba(4,8,16,.82);backdrop-filter:blur(4px)}
.card-modal.open{display:flex}
.card-modal .frame{position:relative;background:#fff;border-radius:16px;padding:14px;box-shadow:0 24px 70px rgba(0,0,0,.6)}
.card-modal img{max-width:300px;width:300px;height:auto;display:block;border-radius:8px}
.card-modal .close{position:absolute;top:-14px;right:-14px;width:34px;height:34px;border-radius:50%;background:var(--brand-grad);color:#04121a;border:none;font-size:18px;font-weight:900;cursor:pointer}

/* ── 页脚 ── */
.site-footer{background:var(--bg-2);border-top:1px solid var(--line);padding:48px 0 30px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px}
.footer-grid h4{font-size:15px;margin:0 0 14px;color:var(--text)}
.footer-grid a,.footer-grid p{color:var(--text-mute);font-size:14px;display:block;margin:6px 0}
.footer-grid a:hover{color:var(--brand)}
.footer-bottom{border-top:1px solid var(--line);margin-top:30px;padding-top:18px;color:var(--text-mute);font-size:13px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}

/* ── 列表页 ── */
.cat-layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:34px;padding:30px 0 72px;align-items:start}
.cat-side{position:sticky;top:90px}
.category-list{list-style:none;margin:0;padding:0}
.category-list li{margin:4px 0}
.category-list a{display:block;padding:11px 16px;border-radius:10px;color:var(--text-dim);border:1px solid transparent;font-weight:600}
.category-list a:hover,.category-list a.active{background:var(--panel);border-color:var(--line);color:var(--brand);text-decoration:none}
.cat-content h2{font-size:24px;margin:0 0 6px}
.cat-content .desc{color:var(--text-dim);margin:0 0 24px}
.item-list{display:grid;gap:14px}
.item-row{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px 20px;transition:.2s}
.item-row:hover{border-color:var(--brand)}
.item-row h3{margin:0 0 6px;font-size:18px}
.item-row h3 a{color:var(--text)}
.item-row p{color:var(--text-dim);font-size:14px;margin:0 0 10px}
.item-row .meta{font-size:12.5px;color:var(--text-mute)}

/* ── 响应式 ── */
@media(max-width:980px){
  .detail-wrap{grid-template-columns:1fr}
  .toc-aside{display:none}
  .grid-3,.grid-2{grid-template-columns:1fr 1fr}
  .cat-layout{grid-template-columns:1fr}
  .cat-side{position:static}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:680px){
  .nav{display:none;position:absolute;top:68px;left:0;right:0;background:var(--bg-2);flex-direction:column;padding:16px 22px;border-bottom:1px solid var(--line)}
  .nav.open{display:flex}
  .menu-toggle{display:block}
  .grid-3,.grid-2{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .side-dock{left:8px}
}