/* Binridge 官网原型 · 共用样式（纯静态，无外部依赖） */
:root{
  --bg:#05080F; --bg2:#0A1120; --card:#0E1626; --card2:#121D33; --line:#1F2B44; --line2:#2A3958;
  --fg:#EEF2F8; --fg2:#B7C1D3; --fg3:#8390A8; --fg4:#5F6B82;
  --cyan:#00E5FF; --sky:#00B8FF; --blue:#246BFF; --blue2:#4D83FF; --amber:#FFB020; --green:#5CCB8A;
  --grad:linear-gradient(100deg,#00E5FF 0%,#00B8FF 30%,#246BFF 75%);
  --r:16px; --wrap:1200px;
  --font:"PingFang SC","Microsoft YaHei","Noto Sans SC","Noto Sans CJK SC","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,"Cascadia Mono","JetBrains Mono",Consolas,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--fg);font-family:var(--font);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 32px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.mono{font-family:var(--mono)}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- 顶栏 ---------- */
.top{position:sticky;top:0;z-index:50;background:rgba(5,8,15,.78);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid rgba(42,57,88,.55)}
.top .wrap{display:flex;align-items:center;height:68px;gap:28px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;letter-spacing:-.01em}
.brand img{width:34px;height:34px}
.brand small{font-weight:400;font-size:12px;color:var(--fg3);letter-spacing:.08em;margin-left:2px;padding-left:10px;border-left:1px solid var(--line2)}
.nav{display:flex;gap:4px;margin-left:auto;align-items:center}
.nav a{padding:8px 14px;border-radius:10px;color:var(--fg2);font-size:15px;transition:color .2s,background .2s}
.nav a:hover{color:var(--fg);background:rgba(255,255,255,.05)}
.nav a.on{color:var(--fg);background:rgba(36,107,255,.16)}
.nav .btn{margin-left:10px}
.menu-btn{display:none;margin-left:auto;width:42px;height:42px;border-radius:10px;border:1px solid var(--line2);background:transparent;color:var(--fg);cursor:pointer;align-items:center;justify-content:center}
.menu-btn svg{width:20px;height:20px}

/* ---------- 按钮与标签 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 22px;border-radius:12px;font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;transition:transform .2s,box-shadow .2s,background .2s;white-space:nowrap;font-family:inherit}
.btn.pri{background:var(--blue);color:#fff;box-shadow:0 8px 30px rgba(36,107,255,.35)}
.btn.pri:hover{background:#3A7BFF;transform:translateY(-1px)}
.btn.ghost{border-color:var(--line2);color:var(--fg);background:rgba(255,255,255,.02)}
.btn.ghost:hover{border-color:#41557d;background:rgba(255,255,255,.05)}
.btn.sm{height:38px;padding:0 16px;font-size:14px;border-radius:10px}
.btn[aria-disabled=true]{opacity:.55;cursor:not-allowed;box-shadow:none;transform:none}
.chip{display:inline-flex;align-items:center;gap:6px;height:26px;padding:0 10px;border-radius:999px;font-size:12.5px;font-weight:600;letter-spacing:.02em;white-space:nowrap}
.chip.soon{background:rgba(255,176,32,.12);color:#FFC65C;border:1px solid rgba(255,176,32,.35)}
.chip.dev{background:rgba(0,229,255,.08);color:#7BEFFF;border:1px solid rgba(0,229,255,.3)}
.chip.ok{background:rgba(92,203,138,.1);color:#7EDCA5;border:1px solid rgba(92,203,138,.3)}
.chip.ph{background:rgba(255,255,255,.05);color:var(--fg3);border:1px dashed var(--line2)}
.chip i{width:6px;height:6px;border-radius:50%;background:currentColor;display:inline-block}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:13px;letter-spacing:.22em;color:var(--sky);font-weight:600;text-transform:uppercase}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--sky)}

/* ---------- 版块 ---------- */
section{position:relative}
.sec{padding:96px 0}
.sec.tight{padding:80px 0}
.sec-head{max-width:760px;margin-bottom:56px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.sec-head.center .eyebrow::after{content:"";width:22px;height:1px;background:var(--sky)}
.sec-head h2{font-size:40px;line-height:1.25;font-weight:700;letter-spacing:-.01em;margin:14px 0 16px}
.sec-head p{color:var(--fg2);font-size:17px}
.alt{background:linear-gradient(180deg,var(--bg) 0%,var(--bg2) 18%,var(--bg2) 82%,var(--bg) 100%)}

/* ---------- 首页主视觉 ---------- */
.hero{padding:84px 0 40px;overflow:hidden}
.hero::before{content:"";position:absolute;left:50%;top:-260px;width:1400px;height:900px;transform:translateX(-50%);background:radial-gradient(closest-side,rgba(36,107,255,.22),rgba(0,184,255,.08) 55%,transparent 75%);pointer-events:none}
.hero .wrap{position:relative}
.hero-copy{text-align:center;max-width:880px;margin:0 auto}
.hero h1{font-size:60px;line-height:1.16;font-weight:800;letter-spacing:-.02em;margin:22px 0 22px}
.hero .lead{font-size:19px;color:var(--fg2);max-width:700px;margin:0 auto}
.hero .cta{display:flex;gap:14px;justify-content:center;margin-top:34px;flex-wrap:wrap}
.hero .meta{display:flex;gap:22px;justify-content:center;margin-top:22px;color:var(--fg3);font-size:14px;flex-wrap:wrap}
.hero .meta span{display:inline-flex;align-items:center;gap:8px}
.hero .meta svg{width:16px;height:16px;color:var(--sky)}
.stage{position:relative;margin:64px auto 0;max-width:1080px}
.stage::after{content:"";position:absolute;left:-14%;right:-14%;bottom:-70px;height:200px;border-radius:50%;border-top:1px solid rgba(77,131,255,.45);background:radial-gradient(60% 50% at 50% 0%,rgba(36,107,255,.18),transparent 70%);pointer-events:none;z-index:-1}
.player{position:relative;border-radius:20px;overflow:hidden;border:1px solid var(--line2);background:#000;box-shadow:0 40px 120px rgba(0,0,0,.6),0 0 0 1px rgba(255,255,255,.03) inset;aspect-ratio:16/9}
.player video,.player img{width:100%;height:100%;object-fit:cover}
.player .sound{position:absolute;right:16px;bottom:16px;height:36px;padding:0 14px;border-radius:999px;background:rgba(5,8,15,.7);border:1px solid rgba(255,255,255,.18);color:#fff;font-size:13px;display:flex;align-items:center;gap:8px;cursor:pointer;font-family:inherit;backdrop-filter:blur(8px)}
.player .sound svg{width:16px;height:16px}
.player-note{text-align:center;color:var(--fg4);font-size:13px;margin-top:16px}

/* ---------- 数字条 ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;margin-top:88px}
.stats div{background:var(--bg2);padding:26px 24px}
.stats b{display:block;font-size:26px;font-weight:700;letter-spacing:-.01em}
.stats span{color:var(--fg3);font-size:14px}

/* ---------- 流程 ---------- */
.flow{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;counter-reset:f}
.flow li{list-style:none;position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px 20px 22px;counter-increment:f}
.flow li::before{content:"0" counter(f);font-family:var(--mono);font-size:13px;color:var(--sky);display:block;margin-bottom:12px}
.flow li:not(:last-child)::after{content:"";position:absolute;right:-13px;top:34px;width:10px;height:10px;border-top:1.5px solid var(--line2);border-right:1.5px solid var(--line2);transform:rotate(45deg)}
.flow h3{font-size:18px;margin-bottom:6px}
.flow p{font-size:14px;color:var(--fg3);line-height:1.6}
.flow .where{display:inline-block;margin-top:12px;font-size:12px;color:var(--fg2);border:1px solid var(--line2);border-radius:6px;padding:1px 8px}

/* ---------- 图文行 ---------- */
.row{display:grid;grid-template-columns:1fr 1.25fr;gap:64px;align-items:center;padding:48px 0}
.wrap>.row:first-child{padding-top:0}.wrap>.row:last-child{padding-bottom:0}
.row.rev{grid-template-columns:1.25fr 1fr}
.row.rev .txt{order:2}
.row .txt h3{font-size:30px;line-height:1.3;margin:12px 0 14px;letter-spacing:-.01em}
.row .txt p{color:var(--fg2)}
.row .txt ul{list-style:none;margin-top:20px;display:grid;gap:10px}
.row .txt li{position:relative;padding-left:26px;color:var(--fg2);font-size:15.5px}
.row .txt li::before{content:"";position:absolute;left:2px;top:8px;width:12px;height:12px;border-radius:4px;background:var(--grad);opacity:.9}
.row .txt li b{color:var(--fg);font-weight:600}
.shot{position:relative;border-radius:14px;overflow:hidden;border:1px solid var(--line2);background:#fff;box-shadow:0 30px 90px rgba(0,0,0,.55)}
.shot img{width:100%}
.shot.dark{background:#0B1220}
.shot-cap{font-size:12.5px;color:var(--fg4);margin-top:12px;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.duo{display:grid;grid-template-columns:1.6fr 1fr;gap:18px;align-items:end}
.phone{border-radius:28px;overflow:hidden;border:6px solid #1B2539;background:#fff;box-shadow:0 30px 80px rgba(0,0,0,.6);max-width:270px}
.phones{display:flex;gap:18px;justify-content:center;align-items:flex-start}
.phones .phone:nth-child(2){margin-top:44px}
.concept{position:relative}
.concept .tagline{position:absolute;left:14px;top:14px;z-index:2}

/* ---------- 卡片网格 ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.cards.two{grid-template-columns:repeat(2,1fr)}
.cards.four{grid-template-columns:repeat(4,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:26px;position:relative;overflow:hidden}
.card h3{font-size:19px;margin:14px 0 8px;line-height:1.4}
.card p{color:var(--fg3);font-size:14.5px}
.card .ico{width:42px;height:42px;border-radius:12px;display:flex;align-items:center;justify-content:center;background:rgba(36,107,255,.14);color:#7FA8FF}
.card .ico svg{width:22px;height:22px}
.card.link{transition:border-color .2s,transform .2s}
.card.link:hover{border-color:#3a5281;transform:translateY(-2px)}
.card .more{display:inline-flex;margin-top:16px;color:#8DB4FF;font-size:14px;font-weight:600}
.card.media{padding:0}
.card.media .body{padding:22px 24px 26px}
.card.media .pic{aspect-ratio:16/10;overflow:hidden;background:#0B1220;border-bottom:1px solid var(--line)}
.card.media .pic img{width:100%;height:100%;object-fit:cover;object-position:top left}
.card.media .pic.light{background:#fff}

/* ---------- 即将推出横幅 ---------- */
.soon-band{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.soon-card{position:relative;border-radius:20px;overflow:hidden;border:1px solid var(--line2);background:var(--card);min-height:420px;display:flex;flex-direction:column}
.soon-card .pic{flex:1;overflow:hidden;position:relative}
.soon-card .pic img{width:100%;height:100%;object-fit:cover;object-position:center}
.soon-card .pic::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 40%,var(--card) 100%)}
.soon-card .body{padding:0 28px 28px;position:relative;margin-top:-40px;z-index:1}
.soon-card h3{font-size:24px;margin:12px 0 8px}
.soon-card p{color:var(--fg2);font-size:15px}
.soon-card .chips{position:absolute;left:18px;top:18px;z-index:2;display:flex;gap:8px}
.soon-card .chips .chip,.concept .tagline .chip{background-color:rgba(5,8,15,.88);backdrop-filter:blur(6px)}
.soon-card .chips .chip.soon{background-color:rgba(40,28,6,.92)}
.soon-card .chips .chip.dev{background-color:rgba(4,30,38,.92)}

/* ---------- 原则 ---------- */
.principles{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.principle{padding:28px;border-radius:var(--r);border:1px solid var(--line);background:linear-gradient(180deg,rgba(36,107,255,.07),transparent)}
.principle b{display:block;font-size:19px;margin-bottom:8px}
.principle p{color:var(--fg3);font-size:14.5px}

/* ---------- CTA ---------- */
.cta-band{border-radius:24px;padding:64px 56px;background:radial-gradient(120% 140% at 0% 0%,rgba(0,229,255,.18),transparent 50%),radial-gradient(120% 140% at 100% 100%,rgba(36,107,255,.3),transparent 55%),var(--card);border:1px solid var(--line2);display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap}
.cta-band h2{font-size:34px;line-height:1.3}
.cta-band p{color:var(--fg2);margin-top:8px}
.cta-band .cta{display:flex;gap:12px;flex-wrap:wrap}

/* ---------- 页面头 ---------- */
.page-head{padding:90px 0 40px;position:relative;overflow:hidden}
.page-head::before{content:"";position:absolute;left:50%;top:-300px;width:1200px;height:700px;transform:translateX(-50%);background:radial-gradient(closest-side,rgba(36,107,255,.18),transparent 70%);pointer-events:none}
.page-head .wrap{position:relative}
.page-head h1{font-size:48px;line-height:1.2;font-weight:800;letter-spacing:-.02em;margin:16px 0 16px}
.page-head p{font-size:18px;color:var(--fg2);max-width:760px}
.page-head .chips{display:flex;gap:10px;margin-top:22px;flex-wrap:wrap}
.subnav{position:sticky;top:68px;z-index:40;background:rgba(5,8,15,.86);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.subnav .wrap{display:flex;gap:6px;overflow-x:auto;scrollbar-width:none;height:54px;align-items:center}
.subnav .wrap::-webkit-scrollbar{display:none}
.subnav a{flex:none;padding:6px 14px;border-radius:999px;color:var(--fg3);font-size:14px;border:1px solid transparent}
.subnav a:hover{color:var(--fg);border-color:var(--line2)}
.anchor{scroll-margin-top:140px}

/* ---------- 六区示意 ---------- */
.zones{display:grid;grid-template-columns:repeat(6,1fr);gap:10px;margin-top:22px}
.zones div{border:1px solid var(--line2);border-radius:12px;padding:12px 10px;text-align:center;background:var(--card);font-size:14px}
.zones div i{display:block;font-style:normal;font-family:var(--mono);font-size:11px;color:var(--sky);margin-bottom:2px}

/* ---------- AI 示意卡（HTML 绘制） ---------- */
.mock{background:#0B1220;border:1px solid var(--line2);border-radius:18px;padding:22px;box-shadow:0 30px 90px rgba(0,0,0,.5);font-size:14px}
.mock .bar{display:flex;align-items:center;gap:8px;color:var(--fg3);font-size:12.5px;margin-bottom:14px}
.mock .bar b{color:var(--fg);font-size:14px}
.mock .sel{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.mock .sel span{padding:4px 10px;border-radius:8px;border:1px solid var(--line2);color:var(--fg2);font-size:13px}
.mock .sel span.on{border-color:#4D83FF;background:rgba(36,107,255,.18);color:#fff}
.mock .voice{display:flex;align-items:center;gap:12px;background:var(--card2);border-radius:12px;padding:12px 14px;margin-bottom:14px}
.mock .voice .mic{width:34px;height:34px;flex:none;border-radius:50%;background:var(--blue);display:flex;align-items:center;justify-content:center;color:#fff}
.mock .voice .mic svg{width:18px;height:18px}
.mock .voice q{quotes:"“" "”";color:var(--fg)}
.mock table{width:100%;border-collapse:collapse;font-size:13.5px}
.mock td{padding:9px 10px;border-top:1px solid var(--line)}
.mock td:first-child{color:var(--fg3);width:80px}
.mock .foot{display:flex;justify-content:space-between;align-items:center;margin-top:14px;gap:10px;flex-wrap:wrap}
.mock .foot small{color:var(--fg4)}
.mock .q{background:rgba(36,107,255,.16);border:1px solid rgba(77,131,255,.35);border-radius:12px 12px 4px 12px;padding:10px 14px;margin-left:auto;max-width:86%;margin-bottom:14px;color:#fff}
.mock .cite{border:1px solid rgba(0,229,255,.3);background:rgba(0,229,255,.04);border-radius:12px;padding:14px 16px;margin-top:12px}
.mock .cite .src{display:flex;gap:8px;flex-wrap:wrap;font-size:12.5px;color:#7BEFFF;margin-bottom:10px}
.mock .cite .src span{border:1px solid rgba(0,229,255,.3);border-radius:6px;padding:0 8px}
.mock .cite .txt{border-left:3px solid var(--cyan);padding-left:12px;color:var(--fg2);font-size:13.5px}
.mock .skel{display:block;height:9px;border-radius:5px;background:linear-gradient(90deg,#22314f,#2b3c5f);margin:7px 0}
.mock .ans{color:var(--fg);line-height:1.8}
.mock .undo{display:flex;gap:10px;align-items:center;justify-content:space-between;background:var(--card2);border-radius:12px;padding:10px 14px;margin-top:12px;font-size:13px;color:var(--fg2)}
.mock .doc{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.mock .doc .pg{background:#f5f6f8;border-radius:8px;padding:12px;color:#333;font-size:11.5px;position:relative;min-height:160px}
.mock .doc .pg .hl{background:rgba(0,184,255,.25);outline:1.5px solid #00A3E0;border-radius:2px;padding:0 2px}
.mock .doc .pg .ln{display:block;height:6px;background:#d9dde4;border-radius:3px;margin:6px 0}
.mock .doc .out td{font-size:12.5px}

/* ---------- 边界 ---------- */
.nolist{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.nolist div{border:1px solid rgba(255,107,107,.25);background:rgba(255,107,107,.04);border-radius:var(--r);padding:24px}
.nolist b{display:flex;gap:10px;align-items:center;font-size:17px;margin-bottom:6px}
.nolist b::before{content:"×";display:inline-flex;width:22px;height:22px;border-radius:50%;align-items:center;justify-content:center;background:rgba(255,107,107,.18);color:#FF8E8E;font-size:14px}
.nolist p{color:var(--fg3);font-size:14.5px}

/* ---------- 下载 / 表单 ---------- */
.dl{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.dl .card{padding:32px}
.dl .card h3{font-size:24px;margin-top:16px}
.dl .spec{margin:16px 0 22px;display:grid;gap:6px;color:var(--fg3);font-size:14.5px}
.form{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form label{display:grid;gap:6px;font-size:14px;color:var(--fg2)}
.form label.full{grid-column:1/-1}
.form input,.form select,.form textarea{background:#0B1220;border:1px solid var(--line2);border-radius:10px;color:var(--fg);padding:11px 14px;font-size:15px;font-family:inherit;outline:none}
.form input:focus,.form select:focus,.form textarea:focus{border-color:var(--blue2);box-shadow:0 0 0 3px rgba(77,131,255,.2)}
.form textarea{min-height:96px;resize:vertical}
.form .actions{grid-column:1/-1;display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.form .hint{font-size:13px;color:var(--fg4)}
.steps3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;counter-reset:s}
.steps3 div{counter-increment:s;padding:24px;border-radius:var(--r);background:var(--card);border:1px solid var(--line)}
.steps3 div::before{content:counter(s);display:inline-flex;width:30px;height:30px;border-radius:50%;align-items:center;justify-content:center;background:rgba(36,107,255,.18);color:#8DB4FF;font-weight:700;margin-bottom:12px}
.steps3 b{display:block;font-size:17px;margin-bottom:6px}
.steps3 p{color:var(--fg3);font-size:14.5px}

/* ---------- 帮助 ---------- */
.help-list{display:grid;gap:14px}
.help-item{display:grid;grid-template-columns:200px 1fr;gap:28px;padding:26px 28px;border-radius:var(--r);border:1px solid var(--line);background:var(--card)}
.help-item h3{font-size:19px}
.help-item h3 small{display:block;font-size:12.5px;color:var(--fg4);font-weight:400;margin-top:4px}
.help-item ul{list-style:none;display:grid;gap:8px}
.help-item li{color:var(--fg2);font-size:15px;padding-left:18px;position:relative}
.help-item li::before{content:"";position:absolute;left:0;top:11px;width:6px;height:6px;border-radius:50%;background:var(--sky)}

/* ---------- 文档页（协议/隐私） ---------- */
.doc-page{max-width:820px}
.doc-page h2{font-size:22px;margin:40px 0 12px}
.doc-page p,.doc-page li{color:var(--fg2);font-size:15.5px}
.doc-page ul{padding-left:22px;display:grid;gap:6px}
.notice{border:1px dashed rgba(255,176,32,.45);background:rgba(255,176,32,.06);border-radius:14px;padding:16px 20px;color:#FFD592;font-size:14.5px;margin-top:24px}

/* ---------- 页脚 ---------- */
.site-foot{border-top:1px solid var(--line);padding:56px 0 40px;margin-top:40px;color:var(--fg3);font-size:14px}
.site-foot .grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:32px}
.site-foot h4{color:var(--fg);font-size:14px;margin-bottom:12px}
.site-foot ul{list-style:none;display:grid;gap:8px}
.site-foot a:hover{color:var(--fg)}
.site-foot .base{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid var(--line);margin-top:40px;padding-top:22px;font-size:13px;color:var(--fg4)}
.site-foot .brand{margin-bottom:12px}

/* ---------- 入场动效（尊重“减少动画”） ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}
.no-js .reveal{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .flow{grid-template-columns:repeat(3,1fr)}
  .flow li::after{display:none}
  .cards.four{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:900px){
  .wrap{padding:0 20px}
  .top .wrap{height:60px}
  .subnav{top:60px}
  .menu-btn{display:inline-flex}
  .nav{display:none;position:absolute;left:0;right:0;top:60px;flex-direction:column;align-items:stretch;gap:2px;padding:12px 16px 18px;background:rgba(7,11,20,.98);border-bottom:1px solid var(--line)}
  .nav.open{display:flex}
  .nav a{padding:12px 14px;font-size:16px}
  .nav .btn{margin:8px 0 0}
  .brand small{display:none}
  .hero{padding:48px 0 20px}
  .hero h1{font-size:36px}
  .hero .lead{font-size:16px}
  .hero .cta .btn{flex:1}
  .stage{margin-top:40px}
  .stage::after{display:none}
  .stats{grid-template-columns:repeat(2,1fr);margin-top:56px}
  .stats b{font-size:21px}
  .sec{padding:72px 0}
  .sec.tight{padding:56px 0}
  .sec-head{margin-bottom:36px}
  .sec-head h2{font-size:28px}
  .sec-head p{font-size:15.5px}
  .flow{grid-template-columns:1fr}
  .row,.row.rev{grid-template-columns:1fr;gap:28px;padding:36px 0}
  .row.rev .txt{order:0}
  .row .txt h3{font-size:24px}
  .cards,.cards.two,.cards.four,.principles,.nolist,.soon-band,.dl,.steps3{grid-template-columns:1fr}
  .soon-card{min-height:0}
  .soon-card .pic{aspect-ratio:16/10;flex:none}
  .duo{grid-template-columns:1fr}
  .phones .phone{max-width:46%}
  .phones .phone:nth-child(2){margin-top:28px}
  .zones{grid-template-columns:repeat(3,1fr)}
  .cta-band{padding:36px 24px}
  .cta-band h2{font-size:24px}
  .cta-band .cta .btn{flex:1}
  .page-head{padding:56px 0 24px}
  .page-head h1{font-size:32px}
  .page-head p{font-size:16px}
  .form{grid-template-columns:1fr}
  .help-item{grid-template-columns:1fr;gap:12px;padding:22px}
  .site-foot .grid{grid-template-columns:1fr 1fr}
  .site-foot .grid>div:first-child{grid-column:1/-1}
  .mock .doc{grid-template-columns:1fr}
}