/* ============================================================
   ToDesk-bb · 连接蓝图 / 工程图纸
   浅色蓝图纸底 + ToDesk 品牌蓝 #0175FF + 电光青 #00D6E1
   招牌:网格纸、角括号、十字准星、虚线接线、等宽标注
   ============================================================ */
:root{
  --brand:#0175FF; --brand-deep:#0153D6; --brand-ink:#01379A;
  --accent:#00D6E1; --accent-deep:#00b3bd;
  --paper:#eef3fb; --paper-2:#e7eef9; --card:#ffffff;
  --ink:#13233f; --ink-2:#34415c; --muted:#5b6a85;
  --line:rgba(1,117,255,.20); --line-strong:rgba(1,117,255,.42);
  --ok:#16a34a; --warn:#d97706;
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,Courier,monospace;
  --sans:"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --radius:4px;
  --grid-a:rgba(1,117,255,.07); --grid-b:rgba(1,117,255,.12);
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);color:var(--ink);background:var(--paper);
  background-image:
    linear-gradient(var(--grid-a) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-a) 1px,transparent 1px),
    linear-gradient(var(--grid-b) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-b) 1px,transparent 1px);
  background-size:20px 20px,20px 20px,100px 100px,100px 100px;
  line-height:1.65;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--brand-deep)}
::selection{background:var(--accent);color:var(--brand-ink)}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}

/* 等宽标注 */
.kicker,.code,.annot,.fig,.check-no,.sbar-no,.cap,.scene-cap,.crumb,.badge,
.topbar-meta,.foot-meta,.spec-item .k,.schematic-head,.node-d,.card-cat,.stamp{
  font-family:var(--mono);letter-spacing:.04em;
}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:700;font-size:15px;padding:12px 22px;border-radius:var(--radius);border:1px solid transparent;cursor:pointer;transition:.15s;white-space:nowrap}
.btn-cta{background:var(--brand);color:#fff;box-shadow:0 6px 18px rgba(1,117,255,.28)}
.btn-cta:hover{background:var(--brand-deep);color:#fff;transform:translateY(-1px)}
.btn-ghost{background:transparent;color:var(--brand-deep);border:1px dashed var(--line-strong)}
.btn-ghost:hover{background:rgba(1,117,255,.06);border-color:var(--brand)}
.btn-sm{padding:9px 16px;font-size:14px}

/* ---------- 标题栏(图纸标题栏) ---------- */
.topbar{position:sticky;top:0;z-index:50;background:rgba(238,243,251,.94);backdrop-filter:blur(8px);border-bottom:2px solid var(--line-strong)}
.topbar-in{max-width:1160px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;gap:22px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800}
.brand img{width:40px;height:40px;border-radius:9px;box-shadow:0 2px 8px rgba(1,117,255,.18)}
.brand b{font-size:18px;display:block;line-height:1.1}
.brand small{display:block;font-family:var(--mono);font-size:10px;color:var(--muted);letter-spacing:.06em;font-weight:400}
.nav{display:flex;gap:4px;margin-left:auto}
.nav-link{font-size:14px;font-weight:600;color:var(--ink-2);padding:8px 12px;border-radius:3px;position:relative}
.nav-link:hover{color:var(--brand)}
.nav-link.active{color:var(--brand-deep);background:rgba(1,117,255,.08)}
.nav-link.active::after{content:"";position:absolute;left:12px;right:12px;bottom:3px;border-bottom:2px dashed var(--brand)}
.nav-cta{margin-left:8px}
.menu-btn{display:none;align-items:center;justify-content:center;background:none;border:1px solid var(--line-strong);border-radius:4px;color:var(--ink);font-size:18px;width:40px;height:40px;cursor:pointer;margin-left:auto}
.topbar-meta{max-width:1160px;margin:0 auto;padding:7px 24px;display:flex;gap:22px;flex-wrap:wrap;font-size:11px;color:var(--muted);border-top:1px dashed var(--line)}
.topbar-meta span{white-space:nowrap}

/* ---------- 首页 hero(左文右接线图) ---------- */
.hero{padding:66px 0 74px}
.hero-in{max-width:1160px;margin:0 auto;padding:0 24px;display:grid;grid-template-columns:1.02fr .98fr;gap:48px;align-items:center}
.hero-txt{min-width:0}
.kicker{display:inline-flex;align-items:center;gap:9px;font-size:12px;color:var(--brand-deep);letter-spacing:.14em;text-transform:uppercase;margin-bottom:18px}
.dot{width:13px;height:13px;border:2px solid var(--brand);position:relative;flex:none}
.dot::before,.dot::after{content:"";position:absolute;background:var(--brand)}
.dot::before{left:50%;top:2px;bottom:2px;width:2px;margin-left:-1px}
.dot::after{top:50%;left:2px;right:2px;height:2px;margin-top:-1px}
.hero-title{font-size:clamp(34px,4.6vw,52px);line-height:1.1;font-weight:900;letter-spacing:-.02em;margin-bottom:20px}
.hl{color:var(--brand-deep);background:linear-gradient(transparent 62%,rgba(0,214,225,.5) 0)}
.hero-sub{font-size:17px;color:var(--ink-2);max-width:520px;margin-bottom:26px}
.hero-cta-row{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:22px}
.hero-meta{display:flex;flex-wrap:wrap;gap:16px 22px}
.hero-meta span{display:inline-flex;align-items:center;gap:7px;font-size:13px;color:var(--muted)}
.hero-meta i{width:8px;height:8px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 3px rgba(22,163,74,.18)}

/* 接线图 schematic */
.schematic{position:relative;background:var(--card);border:1px solid var(--line-strong);border-radius:6px;box-shadow:0 12px 34px rgba(1,117,255,.10)}
.schematic::before{content:"";position:absolute;top:-1px;left:-1px;width:20px;height:20px;border-top:3px solid var(--brand);border-left:3px solid var(--brand);z-index:2}
.schematic::after{content:"";position:absolute;bottom:-1px;right:-1px;width:20px;height:20px;border-bottom:3px solid var(--brand);border-right:3px solid var(--brand);z-index:2}
.schematic-head{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;border-bottom:1px dashed var(--line);font-size:11px;color:var(--muted)}
.schematic-label{letter-spacing:.12em}
.schematic-code{color:var(--brand-deep)}
.schematic-body{position:relative;height:340px;overflow:hidden;background-image:linear-gradient(var(--grid-a) 1px,transparent 1px),linear-gradient(90deg,var(--grid-a) 1px,transparent 1px);background-size:18px 18px;border-radius:0 0 6px 6px}
.node{position:absolute;background:#fff;border:1px solid var(--line-strong);border-radius:5px;padding:12px 14px;min-width:150px;display:flex;flex-direction:column;gap:2px;box-shadow:0 4px 12px rgba(1,117,255,.08);z-index:2}
.node-ico{color:var(--brand);width:22px;height:22px}
.node-ico svg{width:22px;height:22px}
.node-t{font-weight:800;font-size:14px;color:var(--ink)}
.node-d{font-size:11px;color:var(--muted)}
.node-a{top:22px;left:20px}
.node-b{bottom:22px;right:20px}
.wire{position:absolute;inset:0;width:100%;height:100%;color:var(--brand);opacity:.85}
.annot{position:absolute;font-size:11px;color:var(--ink-2);line-height:1.4;z-index:1}
.annot-t{font-weight:700;color:var(--brand-deep);display:block}
.annot-d{color:var(--muted)}
.annot-1{top:118px;left:46%}
.annot-2{top:176px;left:16%}
.annot-3{bottom:118px;right:12%}

/* ---------- 分节(图纸面板) ---------- */
.sec{padding:58px 0}
.sec-alt{background:var(--paper-2);border-top:1px dashed var(--line);border-bottom:1px dashed var(--line)}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:30px}
.sec-title{font-size:30px;font-weight:900;letter-spacing:-.01em;position:relative;padding-left:16px}
.sec-title::before{content:"";position:absolute;left:0;top:7px;bottom:7px;width:4px;background:var(--brand)}
.sec-lead{margin-top:10px;font-size:15px;color:var(--muted)}
.sec-more{font-family:var(--mono);font-size:13px;color:var(--brand-deep);white-space:nowrap}
.fig{display:block;font-size:11px;color:var(--brand-deep);letter-spacing:.14em;text-transform:uppercase;margin-bottom:9px}

/* 部件规格清单(竖排) */
.checklist{border:1px solid var(--line);background:var(--card)}
.check-item{display:grid;grid-template-columns:44px 46px 1fr;grid-template-areas:"no ico t" ". ico d";column-gap:18px;row-gap:3px;align-items:start;padding:20px 22px;border-bottom:1px dashed var(--line)}
.check-item:last-child{border-bottom:0}
.check-no{grid-area:no;color:var(--muted);font-size:12px;padding-top:4px}
.check-ico{grid-area:ico;color:var(--brand);width:30px;height:30px}
.check-ico svg{width:30px;height:30px}
.check-t{grid-area:t;font-weight:800;font-size:17px;color:var(--ink)}
.check-d{grid-area:d;color:var(--ink-2);font-size:14px}

/* 接线三步 */
.steps-bar{position:relative}
.sbar{display:grid;grid-template-columns:repeat(3,1fr);gap:0}
.sbar-step{position:relative;padding:26px 28px;border:1px solid var(--line);background:var(--card);margin:0 -1px}
.sbar-step::after{content:"";position:absolute;top:50%;right:-14px;width:14px;border-top:2px dashed var(--line-strong);z-index:1}
.sbar-step:last-child::after{display:none}
.sbar-no{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border:2px solid var(--brand);border-radius:50%;font-weight:700;color:var(--brand-deep);margin-bottom:12px}
.sbar-t{font-weight:800;font-size:17px;margin-bottom:6px}
.sbar-d{font-size:14px;color:var(--ink-2)}

/* 平台端子排 */
.plats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.plat{position:relative;background:var(--card);border:1px solid var(--line);padding:18px;transition:.15s}
.plat-top{position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--brand),var(--accent))}
.plat:hover{border-color:var(--brand);transform:translateY(-3px);box-shadow:0 10px 24px rgba(1,117,255,.12)}
.plat-ico{color:var(--brand);width:28px;height:28px;margin-bottom:10px}
.plat-ico svg{width:28px;height:28px}
.plat-t{font-weight:800;font-size:16px;margin-bottom:4px}
.plat-d{font-size:13px;color:var(--muted);margin-bottom:12px}
.plat-cta{font-family:var(--mono);font-size:12px;color:var(--brand-deep)}

/* 实景照片画框 */
.scenes{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.scene{background:var(--card);border:1px solid var(--line)}
.scene-img{position:relative;overflow:hidden;aspect-ratio:16/10;border-bottom:1px dashed var(--line)}
.scene-img::before{content:"";position:absolute;top:6px;left:6px;width:16px;height:16px;border-top:3px solid var(--accent);border-left:3px solid var(--accent);z-index:2}
.scene-img::after{content:"";position:absolute;bottom:6px;right:6px;width:16px;height:16px;border-bottom:3px solid var(--accent);border-right:3px solid var(--accent);z-index:2}
.scene-img img{width:100%;height:100%;object-fit:cover;filter:saturate(1.05)}
.scene-cap{position:absolute;left:0;bottom:0;padding:5px 10px;background:rgba(19,35,63,.72);color:#cfe6ff;font-size:10px;letter-spacing:.06em;z-index:2}
.scene-b{padding:14px 16px 16px}
.scene-t{font-weight:800;font-size:16px;margin-bottom:5px}
.scene-d{font-size:13px;color:var(--ink-2)}

/* 资料卡 */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);transition:.15s}
.card:hover{border-color:var(--brand);transform:translateY(-3px);box-shadow:0 10px 24px rgba(1,117,255,.12)}
.card-img{aspect-ratio:16/9;overflow:hidden;border-bottom:1px dashed var(--line)}
.card-img img{width:100%;height:100%;object-fit:cover}
.card-b{padding:14px 16px 16px;display:flex;flex-direction:column;gap:6px;flex:1}
.card-cat{font-size:10px;color:var(--brand-deep);letter-spacing:.12em;text-transform:uppercase}
.card-t{font-weight:800;font-size:16px;color:var(--ink);line-height:1.35}
.card-d{font-size:13px;color:var(--muted)}
.card-more{font-family:var(--mono);font-size:12px;color:var(--brand-deep);margin-top:auto}

/* 表格 */
.table{overflow-x:auto;border:1px solid var(--line);background:var(--card)}
.table table{width:100%;border-collapse:collapse;font-size:14px}
.table th,.table td{padding:13px 16px;text-align:left;border-bottom:1px dashed var(--line)}
.table th{background:rgba(1,117,255,.06);font-family:var(--mono);font-size:12px;color:var(--brand-deep);letter-spacing:.06em}
.table tr:last-child td{border-bottom:0}
.yes{color:var(--ok);font-weight:800}
.no{color:#c6cfdd}

/* FAQ */
.faq{border:1px solid var(--line);background:var(--card)}
.faq-item{border-bottom:1px dashed var(--line)}
.faq-item:last-child{border-bottom:0}
.faq-q{width:100%;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:16px 18px;background:none;border:0;cursor:pointer;font:inherit;font-weight:700;font-size:15px;color:var(--ink);text-align:left}
.faq-q:hover{color:var(--brand-deep)}
.faq-q .ico{font-family:var(--mono);color:var(--brand);font-size:18px;line-height:1;transition:transform .15s}
.faq-a{display:none;padding:0 18px 16px;color:var(--ink-2);font-size:14px}
.faq-item.open .faq-a{display:block}
.faq-item.open .faq-q .ico{transform:rotate(45deg)}

/* CTA 图章 */
.cta{position:relative;background:linear-gradient(135deg,var(--brand),var(--brand-deep));color:#fff;border-radius:8px;padding:44px 48px;display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap;overflow:hidden}
.cta::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.08) 1px,transparent 1px);background-size:22px 22px}
.cta-t{font-size:26px;font-weight:900;position:relative}
.cta-d{font-size:15px;color:rgba(255,255,255,.9);margin-top:8px;max-width:560px;position:relative}
.cta-actions{display:flex;gap:14px;position:relative;flex-wrap:wrap}
.cta .btn-cta{background:#fff;color:var(--brand-deep);box-shadow:none}
.cta .btn-ghost{border-color:rgba(255,255,255,.6);color:#fff}
.stamp{position:absolute;right:36px;top:50%;transform:translateY(-50%) rotate(-8deg);font-size:64px;font-weight:900;color:rgba(255,255,255,.10);letter-spacing:.1em;pointer-events:none;line-height:1;z-index:0}
.cta > *:not(.stamp){z-index:1}

/* ---------- 页脚(图纸信息栏) ---------- */
.foot{background:#0d1b33;color:#c7d4ea;position:relative}
.foot::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--brand),var(--accent))}
.foot-in{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:34px;max-width:1160px;margin:0 auto;padding:46px 24px 34px}
.foot-brand .brand{color:#fff}
.foot-brand .brand small{color:#7f92b4}
.foot-brand p{font-size:13px;color:#8fa1bf;margin-top:14px;max-width:300px}
.foot h5{font-family:var(--mono);font-size:12px;letter-spacing:.12em;color:#eaf1ff;margin-bottom:14px;text-transform:uppercase}
.foot-links{list-style:none}
.foot-links li{margin-bottom:8px}
.foot-links a{color:#9db0cd;font-size:13px}
.foot-links a:hover{color:#fff}
.foot-meta{max-width:1160px;margin:0 auto;padding:14px 24px;border-top:1px dashed rgba(255,255,255,.12);display:flex;gap:22px;flex-wrap:wrap;font-size:11px;color:#7f92b4}
.foot-copy{max-width:1160px;margin:0 auto;padding:0 24px 24px;font-size:12px;color:#6f83a5}
.foot-copy a{color:#9db0cd}

/* ---------- 内页 hero ---------- */
.page-hero{position:relative;padding:54px 0 46px;border-bottom:1px dashed var(--line);background:linear-gradient(180deg,rgba(255,255,255,.55),transparent)}
.page-hero-in{max-width:1160px;margin:0 auto;padding:0 24px}
.page-title{font-size:40px;font-weight:900;letter-spacing:-.01em;margin-bottom:12px}
.page-sub{font-size:16px;color:var(--ink-2);max-width:760px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}

.crumb{font-family:var(--mono);font-size:12px;color:var(--muted);padding:18px 0 0}
.crumb a{color:var(--brand-deep)}

/* 规格表 */
.spec-grid{display:grid;grid-template-columns:repeat(2,1fr);border:1px solid var(--line);background:var(--card)}
.spec-item{display:flex;justify-content:space-between;gap:16px;padding:16px 20px;border-bottom:1px dashed var(--line)}
.spec-item:nth-child(odd){border-right:1px dashed var(--line)}
.spec-item .k{font-family:var(--mono);font-size:12px;color:var(--muted);white-space:nowrap}
.spec-item .v{font-weight:600;color:var(--ink);text-align:right}

/* 提示/警示 */
.callout{position:relative;margin-top:16px;padding:16px 18px 16px 46px;border:1px solid var(--line);background:rgba(1,117,255,.05);font-size:14px;color:var(--ink-2)}
.callout .ico{position:absolute;left:16px;top:16px;width:20px;height:20px;border:1.5px solid var(--brand);border-radius:50%;text-align:center;line-height:17px;color:var(--brand-deep);font-style:normal;font-weight:700}
.tip{position:relative;margin-top:16px;padding:14px 16px 14px 42px;border:1px dashed var(--accent-deep);background:rgba(0,214,225,.06);font-size:14px;color:var(--ink-2)}
.tip .ico{position:absolute;left:15px;top:14px;color:var(--accent-deep);font-weight:700}

/* 左右图文 */
.split{display:grid;grid-template-columns:1fr 1fr;gap:34px;align-items:center}
.split-img{position:relative;border:1px solid var(--line-strong);padding:8px;background:var(--card)}
.split-img::before{content:"";position:absolute;top:4px;left:4px;width:16px;height:16px;border-top:3px solid var(--brand);border-left:3px solid var(--brand);z-index:2}
.split-img::after{content:"";position:absolute;bottom:4px;right:4px;width:16px;height:16px;border-bottom:3px solid var(--brand);border-right:3px solid var(--brand);z-index:2}
.split-img img{width:100%;aspect-ratio:16/10;object-fit:cover;display:block}
.split-txt h3{font-size:22px;font-weight:900;margin-bottom:12px}
.split-txt p{color:var(--ink-2);margin-bottom:12px}

/* ---------- 文章双栏 ---------- */
.article-grid{display:grid;grid-template-columns:240px 1fr;gap:34px;align-items:start}
.toc-nav{position:sticky;top:96px;border:1px solid var(--line);background:var(--card);padding:18px}
.toc-nav h4{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--brand-deep);text-transform:uppercase;margin-bottom:12px}
.toc-link{display:block;font-size:13px;color:var(--ink-2);padding:6px 0;border-bottom:1px dashed var(--line)}
.toc-link:last-child{border-bottom:0}
.toc-link:hover{color:var(--brand)}
.article-body{max-width:760px;min-width:0}
.article-body h1{font-size:34px;font-weight:900;line-height:1.2;margin-bottom:14px}
.article-meta{display:flex;gap:14px;align-items:center;font-family:var(--mono);font-size:12px;color:var(--muted);margin-bottom:18px;flex-wrap:wrap}
.badge{background:var(--brand);color:#fff;padding:3px 9px;border-radius:3px;font-size:11px;letter-spacing:.06em}
.lead{font-size:17px;color:var(--ink-2);line-height:1.7;margin-bottom:22px;border-left:3px solid var(--brand);padding-left:14px}
.article-body h2{font-size:22px;font-weight:900;margin:30px 0 12px;padding-top:8px}
.article-body p{color:var(--ink-2);margin-bottom:14px;line-height:1.8}
.article-body img{width:100%;margin:18px 0 6px;border:1px solid var(--line);padding:6px;background:var(--card)}
.cap{font-family:var(--mono);font-size:11px;color:var(--muted);margin-bottom:20px}
.author{display:flex;align-items:center;gap:12px;margin-top:26px;padding:16px;border:1px dashed var(--line);background:var(--card)}
.avatar{width:40px;height:40px;border-radius:50%;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;flex:none}
.author b{display:block}
.author small{color:var(--muted)}

/* 相关阅读 */
.related{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.related-card{display:flex;flex-direction:column;gap:6px;padding:16px;border:1px solid var(--line);background:var(--card)}
.related-card:hover{border-color:var(--brand)}
.related-card b{font-size:15px;color:var(--ink)}
.related-card span{font-family:var(--mono);font-size:12px;color:var(--muted)}

/* 搜索 */
.search-box{border:1px solid var(--line-strong);background:var(--card);padding:6px}
.search-input{width:100%;padding:12px 14px;font-size:15px;font-family:var(--sans);border:0;outline:0;background:transparent;color:var(--ink)}

/* 404 */
.notfound{text-align:center;padding:80px 20px}
.code{font-family:var(--mono);font-size:110px;font-weight:900;color:var(--line-strong);line-height:1}
.notfound h2{font-size:26px;margin:10px 0}
.notfound p{color:var(--muted);margin-bottom:20px}

/* 返回顶部 */
.backtop{position:fixed;right:22px;bottom:22px;width:44px;height:44px;border-radius:6px;border:1px solid var(--line-strong);background:var(--card);color:var(--brand-deep);font-size:18px;cursor:pointer;opacity:0;visibility:hidden;transition:.2s;z-index:60}
.backtop.show{opacity:1;visibility:visible}

/* ---------- 响应式 ---------- */
@media(max-width:1024px){
  .plats{grid-template-columns:repeat(2,1fr)}
  .scenes{grid-template-columns:repeat(2,1fr)}
  .cards{grid-template-columns:repeat(2,1fr)}
  .related{grid-template-columns:repeat(2,1fr)}
  .foot-in{grid-template-columns:1fr 1fr}
  .spec-grid{grid-template-columns:1fr}
  .spec-item:nth-child(odd){border-right:0}
  .split{grid-template-columns:1fr}
  .sbar{grid-template-columns:1fr}
  .sbar-step{margin:0 0 10px}
  .sbar-step::after{display:none}
}
@media(max-width:900px){
  .hero-in{grid-template-columns:1fr;gap:34px}
  .article-grid{grid-template-columns:1fr}
  .toc-nav{position:static;margin-bottom:8px}
  .nav{position:absolute;top:100%;left:0;right:0;background:var(--card);border-bottom:2px solid var(--line-strong);flex-direction:column;gap:0;display:none;padding:8px 0}
  .nav.open{display:flex}
  .nav-link{padding:12px 24px}
  .nav-link.active::after{display:none}
  .nav-cta{display:none}
  .menu-btn{display:inline-flex}
}
@media(max-width:640px){
  .sec{padding:42px 0}
  .hero{padding:44px 0 54px}
  .page-title{font-size:30px}
  .sec-title{font-size:24px}
  .plats,.scenes,.cards,.related{grid-template-columns:1fr}
  .foot-in{grid-template-columns:1fr}
  .check-item{grid-template-columns:46px 1fr;grid-template-areas:"ico t" "ico d"}
  .check-no{display:none}
  .cta{padding:34px 26px}
  .cta-t{font-size:22px}
  .stamp{right:16px;font-size:44px}
  .schematic-body{height:300px}
  .annot{display:none}
}