:root{--bg:#07131F;--bg-2:#0A1A2A;--panel:#0D2337;--panel-2:#122B40;--ink:#EAF7FC;--ink-soft:#9FB6C7;
--muted:#5E7A8C;--line:#1B3A52;--ocean:#3DF0C8;--ocean-deep:#0E8F7C;--aurora:#3DF0C8;--sky:#7DD3FC;
--glow:#A3E635;--card:#0D2337;--ice-2:#0F2A3F;--ocean-dark:#06263A;
--shadow:0 12px 40px rgba(0,0,0,.45);--grad:linear-gradient(135deg,#3DF0C8,#7DD3FC);
--font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--ink);line-height:1.75;font-size:16px}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
.accent{color:var(--ocean)}
.eyebrow{display:inline-block;font-size:13px;letter-spacing:.18em;text-transform:uppercase;color:var(--ocean);margin-bottom:12px}
h1,h2,h3{line-height:1.25;font-weight:700}
h2{font-size:30px;margin-bottom:8px}
h3{font-size:19px}

/* 左侧侧边栏 */
.sidenav{position:fixed;top:0;left:0;bottom:0;width:238px;z-index:60;display:flex;flex-direction:column;
background:linear-gradient(180deg,#0A1A2A,#07131F);border-right:1px solid var(--line);padding:22px 14px 20px;overflow-y:auto}
.side-brand{display:flex;align-items:center;gap:10px;padding:2px 8px 18px;margin-bottom:14px;border-bottom:1px solid var(--line)}
.side-brand .brand-mark{width:34px;height:34px;border-radius:8px}
.brand-word{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-size:17px;font-weight:800;letter-spacing:.02em}
.brand-name em{font-style:normal;color:var(--ocean)}
.brand-sub{font-size:11px;color:var(--muted);margin-top:2px}
.side-nav{display:flex;flex-direction:column;gap:2px;flex:1}
.side-label{font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin:14px 8px 6px}
.side-link{display:flex;align-items:center;font-size:14.5px;color:var(--ink-soft);padding:8px 12px;border-radius:6px;
transition:.2s;border-left:2px solid transparent}
.side-link:hover{color:var(--ink);background:var(--panel)}
.side-link.on{color:var(--ocean);background:var(--panel);border-left-color:var(--ocean)}
.side-cta{margin-top:14px;display:flex;align-items:center;justify-content:center;gap:8px;background:var(--grad);
color:#04211B;font-weight:700;padding:11px;border-radius:6px;font-size:14.5px}
.side-cta .ico{width:16px;height:16px}
.site-main{margin-left:238px}

/* 按钮 */
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:600;padding:11px 20px;border-radius:6px;
font-size:15px;transition:.2s;border:1px solid transparent;cursor:pointer}
.btn .ico{width:17px;height:17px}
.btn-primary{background:var(--grad);color:#04211B}
.btn-primary:hover{filter:brightness(1.08)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--ocean);color:var(--ocean)}
.btn-big{padding:14px 26px;font-size:16px}

/* 首页 hero */
.deep-hero{position:relative;min-height:88vh;display:flex;align-items:center;overflow:hidden}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:blur(6px) brightness(.55);transform:scale(1.06)}
.hero-veil{position:absolute;inset:0;background:linear-gradient(120deg,rgba(7,19,31,.96),rgba(7,19,31,.72) 55%,rgba(7,19,31,.5))}
.god-rays{position:absolute;inset:0;opacity:.9;pointer-events:none}
.god-rays .god-ray{position:absolute;top:0;left:0;width:100%;height:100%}
.hero-plankton{position:absolute;inset:0;opacity:.5;pointer-events:none}
.hero-plankton .plankton{position:absolute;width:100%;height:100%;top:0;left:0}
.hero-inner{position:relative;z-index:3;display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;padding:70px 24px}
.hero-copy h1{font-size:62px;letter-spacing:-.01em;margin:2px 0 6px}
.hero-tag{font-size:19px;color:var(--ocean);margin-bottom:16px}
.hero-sub{font-size:16.5px;color:var(--ink-soft);max-width:520px;margin-bottom:26px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:24px}
.hero-points{display:flex;gap:10px;flex-wrap:wrap}
.hero-points .point{font-size:13px;color:var(--ink-soft);border:1px solid var(--line);padding:5px 12px;border-radius:6px;background:rgba(13,35,55,.5)}
.hero-media{display:flex;justify-content:center}
.beluga-card{position:relative;width:min(420px,100%);border-radius:16px;overflow:hidden;box-shadow:var(--shadow);border:1px solid rgba(61,240,200,.25)}
.beluga-card .beluga-svg{width:100%;height:auto;display:block}
.beluga-rays,.beluga-bubbles,.beluga-halo,.beluga-swim,.beluga-tail,.beluga-body,.beluga-belly,.beluga-flipper,.beluga-spout,.beluga-eye,.beluga-blow,.beluga-smile{}
.beluga-card::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(7,19,31,.85))}
.glow-ring{position:absolute;inset:0;border-radius:16px;box-shadow:inset 0 0 0 1px rgba(61,240,200,.35),0 0 40px rgba(61,240,200,.25) inset}
.beluga-cap{position:absolute;left:18px;bottom:16px;color:var(--ink);font-size:14px;letter-spacing:.12em;z-index:2}
.sweep-line{position:absolute;left:0;right:0;bottom:0;height:2px;background:linear-gradient(90deg,transparent,var(--ocean),transparent);opacity:.7}

/* 荧光数据带 */
.glow-strip{background:linear-gradient(180deg,var(--bg-2),var(--bg));border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.glow-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);padding:0}
.glow-cell{position:relative;background:var(--bg);padding:28px 24px;display:flex;flex-direction:column;gap:8px}
.glow-cell em{font-size:12px;color:var(--ocean);letter-spacing:.14em;font-style:normal}
.glow-cell .ico{width:22px;height:22px;color:var(--ocean)}
.glow-cell strong{font-size:17px}
.glow-cell p{font-size:13.5px;color:var(--muted)}

/* 区块通用 */
.section{padding:76px 0}
.section.alt{background:var(--bg-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{max-width:640px;margin-bottom:36px}
.section-head p{color:var(--muted);margin-top:8px}
.section-head.light h2{color:#fff}
.section-head.light p{color:#cfe0ea}
.section-foot{margin-top:30px}

/* 潜深仪表 */
.dive-gauge{background:var(--bg)}
.gauge-list{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.gauge-card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:24px;display:flex;flex-direction:column;gap:14px}
.gauge-meter{position:relative;display:flex;flex-direction:column;align-items:center;padding-bottom:6px}
.gauge-meter .gauge{width:180px;height:110px}
.gauge-meter span{position:absolute;bottom:0;font-size:15px;font-weight:700;color:var(--ocean);letter-spacing:.04em}
.gauge-body h3{margin-bottom:6px}
.gauge-body p{color:var(--muted);font-size:14.5px}

/* 鲸歌频谱 */
.whale-song{position:relative;overflow:hidden;padding:76px 0}
.song-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.4)}
.song-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(7,19,31,.9),rgba(7,19,31,.94))}
.song-inner{position:relative;z-index:2}
.spectrum-box{background:rgba(7,19,31,.6);border:1px solid var(--line);border-radius:14px;padding:28px;margin:8px 0 26px}
.spectrum-box .spectrum{width:100%;height:auto}
.song-chips{display:flex;gap:10px;flex-wrap:wrap}
.chip{font-size:13.5px;color:var(--ink-soft);border:1px solid var(--line);padding:7px 14px;border-radius:20px;background:rgba(13,35,55,.55)}

/* 光速通道 */
.light-corridor{background:var(--bg-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.corridor{display:flex;flex-direction:column;gap:22px;max-width:760px}
.lane{display:grid;grid-template-columns:200px 1fr 60px;align-items:center;gap:20px}
.lane-name{font-size:14.5px;color:var(--ink-soft)}
.lane-track{height:14px;background:var(--panel);border-radius:7px;overflow:hidden;border:1px solid var(--line)}
.lane-flow{height:100%;border-radius:7px}
.lane-flow.slow{background:linear-gradient(90deg,#5E7A8C,#8aa2b3)}
.lane-flow.fast{background:linear-gradient(90deg,#3DF0C8,#7DD3FC);box-shadow:0 0 14px rgba(61,240,200,.5)}
.lane-val{font-size:13.5px;text-align:right;color:var(--ink-soft)}

/* 深海场景墙 */
.deep-scene{background:var(--bg)}
.scene-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.scene-tile{position:relative;border-radius:12px;overflow:hidden;border:1px solid var(--line)}
.scene-tile img{width:100%;aspect-ratio:3/4;object-fit:cover;filter:brightness(.85);transition:.3s}
.scene-tile:hover img{filter:brightness(1)}
.scene-tile figcaption{position:absolute;left:0;right:0;bottom:0;padding:46px 16px 16px;background:linear-gradient(180deg,transparent,rgba(7,19,31,.92))}
.scene-tag{display:inline-block;font-size:11px;color:var(--ocean);border:1px solid rgba(61,240,200,.4);padding:2px 8px;border-radius:4px;margin-bottom:6px}
.scene-tile strong{display:block;font-size:16px;margin-bottom:2px}
.scene-tile p{font-size:13px;color:var(--ink-soft)}

/* 发光 FAQ */
.glow-faq{display:flex;flex-direction:column;gap:12px;max-width:820px}
.gf-item{background:var(--panel);border:1px solid var(--line);border-left:3px solid var(--ocean);border-radius:10px;padding:18px 22px}
.gf-item summary{cursor:pointer;font-weight:600;font-size:16.5px;list-style:none;position:relative}
.gf-item summary::-webkit-details-marker{display:none}
.gf-item summary::after{content:"+";position:absolute;right:0;top:50%;transform:translateY(-50%);color:var(--ocean);font-size:20px}
.gf-item[open] summary::after{content:"−"}
.gf-item p{color:var(--ink-soft);margin-top:12px}

/* 深海收尾 CTA */
.deep-cta{position:relative;overflow:hidden;padding:88px 0}
.cta-bg{position:absolute;inset:0;background-size:cover;background-position:center;filter:brightness(.4)}
.cta-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(7,19,31,.9),rgba(6,38,58,.9))}
.cta-inner{position:relative;z-index:2}
.cta-card{max-width:620px;margin:0 auto;text-align:center;background:rgba(13,35,55,.72);border:1px solid rgba(61,240,200,.3);border-radius:18px;padding:48px 36px;backdrop-filter:blur(8px)}
.cta-card h2{font-size:34px;margin-bottom:12px}
.cta-card p{color:var(--ink-soft);margin-bottom:26px}

/* 子页 hero */
.page-hero{background:radial-gradient(1200px 400px at 50% -10%,rgba(61,240,200,.12),transparent),var(--bg-2);border-bottom:1px solid var(--line);padding:64px 0 48px}
.page-hero h1{font-size:42px;margin:4px 0 8px}
.page-sub{color:var(--ink-soft);font-size:16px;max-width:660px;margin-bottom:20px}
.breadcrumb{font-size:13px;color:var(--muted);margin-bottom:18px;display:flex;flex-wrap:wrap;gap:6px}
.crumb a{color:var(--ink-soft)}
.crumb a:hover{color:var(--ocean)}
.crumb:not(:last-child)::after{content:"/";margin-left:6px;color:var(--muted)}

/* 平台卡 */
.platform-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.platform-float{display:block;background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden;transition:.2s}
.platform-float:hover{transform:translateY(-4px);border-color:var(--ocean)}
.pf-top{height:6px}
.pf-body{padding:20px}
.pf-ico{font-size:24px}
.pf-body h3{margin:8px 0 4px}
.pf-body p{font-size:13.5px;color:var(--muted)}
.pf-link{display:inline-block;margin-top:10px;font-size:13.5px;color:var(--ocean)}

/* 功能格 */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature-card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:24px}
.feature-ico{width:30px;height:30px;color:var(--ocean);margin-bottom:12px}
.feature-card h3{margin-bottom:8px}
.feature-card p{color:var(--muted);font-size:14.5px}
.people-row{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}

/* 步骤 */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step{display:flex;gap:16px}
.step-num{flex:0 0 44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;
background:var(--grad);color:#04211B;font-weight:800;font-size:18px}
.step-body h3{margin-bottom:6px}
.step-body p{color:var(--muted);font-size:14.5px}

/* 左右图文 */
.split{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center}
.split-copy h2{font-size:26px;margin-bottom:14px}
.split-copy h3{margin:16px 0 6px;color:var(--ocean)}
.split-copy p{color:var(--muted);margin-bottom:12px}
.split-copy .btn{margin-top:10px}
.split-media{display:flex;justify-content:center;align-items:center}
.split-media .media-frame{width:100%}
.media-frame{border-radius:14px;overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow)}
.media-frame img{width:100%;aspect-ratio:4/3;object-fit:cover}

/* 表格 */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:var(--panel)}
table{width:100%;border-collapse:collapse;font-size:14.5px;min-width:560px}
th,td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--line)}
th{background:var(--panel-2);color:var(--ink);font-weight:600}
td{color:var(--ink-soft)}
tr:last-child td{border-bottom:none}

/* 提示 */
.tip{background:rgba(61,240,200,.08);border:1px solid rgba(61,240,200,.25);border-radius:10px;padding:16px 20px;margin-top:18px;font-size:14px;color:var(--ink-soft)}

/* 清单 */
.checklist{list-style:none;margin:16px 0}
.checklist li{padding:8px 0 8px 28px;position:relative;color:var(--ink-soft)}
.checklist li::before{content:"";position:absolute;left:0;top:14px;width:14px;height:14px;border-radius:50%;background:var(--grad)}

/* 站点地图 */
.sitegroup{margin-bottom:30px}
.sitegroup h2{font-size:20px;color:var(--ocean);margin-bottom:12px;padding-bottom:8px;border-bottom:1px solid var(--line)}
.sitegroup ul{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:8px 20px}
.sitegroup li a{color:var(--ink-soft);font-size:14.5px}
.sitegroup li a:hover{color:var(--ocean)}

/* 搜索 */
.search-box{display:flex;gap:10px;max-width:560px;margin:10px 0 20px}
.search-input{flex:1;background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:13px 16px;color:var(--ink);font-size:15px}
.search-input:focus{outline:none;border-color:var(--ocean)}
.search-btn{background:var(--grad);color:#04211B;border:none;border-radius:8px;padding:0 24px;font-weight:600;cursor:pointer}
.search-results .hit{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:12px 16px;margin-top:10px}
.search-results .hit a{color:var(--ink)}

/* 分享 */
.share{display:flex;align-items:center;gap:10px;margin-top:26px;padding-top:18px;border-top:1px solid var(--line);flex-wrap:wrap}
.share span{font-size:13px;color:var(--muted)}
.share a{font-size:13px;color:var(--ocean)}

/* 页脚 */
.sitefoot{background:#040D16;border-top:1px solid var(--line);margin-top:0}
.foot-top{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:40px 0 28px;flex-wrap:wrap}
.foot-brand{display:flex;align-items:center;gap:10px}
.foot-brand .brand-mark{width:30px;height:30px;border-radius:8px}
.foot-info{font-size:14px;color:var(--muted)}
.foot-links{display:flex;gap:20px;flex-wrap:wrap}
.foot-links a{font-size:14px;color:var(--ink-soft)}
.foot-links a:hover{color:var(--ocean)}
.foot-copy{text-align:center;padding:18px 0 26px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}

/* 返回顶部 */
.backtop{position:fixed;right:26px;bottom:26px;width:44px;height:44px;border-radius:8px;background:var(--grad);
color:#04211B;border:none;font-size:20px;cursor:pointer;z-index:50;opacity:0;visibility:hidden;transition:.3s}
.backtop.show{opacity:1;visibility:visible}

/* 文章页(供 _articles.py 复用) */
.article-hero{position:relative;background-size:cover;background-position:center;padding:64px 0 48px;border-bottom:1px solid var(--line)}
.article-hero .wrap{position:relative;z-index:2}
.article-hero h1{font-size:34px;margin:4px 0 10px;max-width:760px}
.article-meta{font-size:13px;color:var(--muted)}
.article-layout{display:grid;grid-template-columns:220px 1fr;gap:40px;padding:44px 24px 20px}
.toc{position:sticky;top:24px;align-self:start;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:20px}
.toc h4{font-size:13px;letter-spacing:.1em;color:var(--ocean);margin-bottom:12px}
.toc a{display:block;font-size:13.5px;color:var(--ink-soft);padding:6px 0;border-bottom:1px dashed var(--line)}
.toc a:hover{color:var(--ocean)}
.article-body h2{font-size:24px;margin:30px 0 12px;padding-left:12px;border-left:3px solid var(--ocean)}
.article-body p{color:var(--ink-soft);margin-bottom:16px}
.article-body img{width:100%;border-radius:12px;margin:20px 0;border:1px solid var(--line)}
.lead{font-size:17px;color:var(--ink);background:rgba(61,240,200,.06);border:1px solid rgba(61,240,200,.2);border-radius:10px;padding:18px 22px;margin-bottom:22px}
.related{margin-top:34px}
.related h3{font-size:18px;margin-bottom:14px}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.related-card{display:block;background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:16px;font-size:14px;color:var(--ink-soft)}
.related-card:hover{border-color:var(--ocean);color:var(--ink)}

@media(max-width:960px){
  .sidenav{position:static;width:100%;flex-direction:row;flex-wrap:wrap;align-items:center;gap:8px 16px;padding:12px 16px;border-right:0;border-bottom:1px solid var(--line);overflow:visible}
  .side-brand{margin:0;padding:0;border:0}
  .side-nav{flex-direction:row;flex-wrap:wrap;gap:2px 10px;width:100%;order:3}
  .side-label{display:none}
  .side-link{border-left:0;padding:5px 10px}
  .side-cta{margin:0 0 0 auto}
  .site-main{margin-left:0}
  .hero-inner{grid-template-columns:1fr;padding:46px 20px}
  .hero-copy h1{font-size:44px}
  .hero-media{order:2}
  .glow-grid{grid-template-columns:1fr 1fr}
  .gauge-list,.feature-grid,.steps,.scene-grid,.platform-grid{grid-template-columns:1fr 1fr}
  .people-row{grid-template-columns:1fr 1fr}
  .split{grid-template-columns:1fr;gap:28px}
  .article-layout{grid-template-columns:1fr}
  .toc{position:static}
  .lane{grid-template-columns:1fr;gap:8px}
  .lane-val{text-align:left}
  .sitegroup ul{grid-template-columns:1fr 1fr}
  .foot-top{flex-direction:column;align-items:flex-start}
}
@media(max-width:560px){
  .glow-grid,.gauge-list,.feature-grid,.steps,.scene-grid,.platform-grid,.people-row,.related-grid{grid-template-columns:1fr}
  .hero-copy h1{font-size:36px}
}