:root{color-scheme:dark;--bg:#080d13;--surface:#111a23;--panel:#15212d;--text:#f6f8fb;--muted:#b1c4d1;--line:#324251;--glow:#a9e8e5;--accent:#b9f1e2;--radius:18px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:radial-gradient(ellipse 70% 30% at 55% 0%,#19323c 0%,transparent 80%),var(--bg);color:var(--text);font:16px/1.65 system-ui,-apple-system,"Segoe UI",sans-serif}
button,input,select{font:inherit}a{color:inherit}button{cursor:pointer}img{max-width:100%}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--glow);outline-offset:3px}
.demo-header{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap;padding:15px max(4vw,18px);border-bottom:1px solid #ffffff18;background:#0c141bea;backdrop-filter:blur(18px)}
.demo-logo{display:inline-flex;align-items:center;min-width:120px}.demo-logo img{width:168px;max-width:42vw;height:auto;max-height:54px;object-fit:contain}
.demo-nav,.lang-links{display:flex;align-items:center;gap:18px;flex-wrap:wrap}.demo-nav a,.lang-links a{font-size:13px;text-decoration:none;color:#c7d4df}.lang-links{gap:9px}.lang-links a{border:1px solid #4d5e6e;border-radius:6px;padding:2px 8px}.lang-links a[aria-current=page]{background:#e9fff6;color:#0d2025;border-color:#e9fff6}
.container{max-width:1210px;margin:0 auto;padding:0 24px}
.hero{padding:90px 0 82px}.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.25em;color:var(--glow);font-weight:700}h1{font-size:clamp(42px,7.7vw,100px);line-height:1.03;letter-spacing:-.075em;max-width:900px;margin:22px 0 28px}h2{font-size:clamp(30px,4.2vw,52px);line-height:1.14;letter-spacing:-.06em;margin:10px 0 18px}h3{line-height:1.2;letter-spacing:-.04em}.lead{max-width:760px;font-size:clamp(17px,2vw,21px);color:var(--muted);line-height:1.65}.pill{display:inline-flex;border:1px solid #63948b;border-radius:100px;padding:6px 14px;color:var(--accent);font-size:12px;text-transform:uppercase;letter-spacing:.07em}
.hero-anchors,.action-row{display:flex;flex-wrap:wrap;gap:11px;margin-top:28px}.action-row{align-items:center;margin-top:22px}.action,.outline{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:46px;padding:11px 20px;border-radius:10px;text-decoration:none;font-weight:700;font-size:14px;transition:transform .2s}
.action{background:var(--accent);color:#08201f;border:1px solid var(--accent)}.outline{border:1px solid #617588;color:#edf7fb;background:#ffffff09}.action:hover,.outline:hover{transform:translateY(-2px)}
.demo-section{padding:75px 0;border-top:1px solid var(--line);scroll-margin-top:104px}.intro{max-width:805px;color:var(--muted);font-size:17px;margin-bottom:34px}.surface{background:linear-gradient(160deg,#182835,#0e1720);border:1px solid #405365;border-radius:22px;padding:clamp(18px,3vw,38px);box-shadow:0 18px 50px #0005}
.calc-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(250px,.85fr);gap:26px;align-items:stretch}
.field{display:grid;gap:8px;margin-bottom:23px}.field-label{display:flex;justify-content:space-between;gap:10px;font-size:14px;font-weight:700}.field label{font-size:14px;font-weight:700}.field select,.chat-input input{width:100%;border:1px solid #718190;background:#0e1b27;color:#fff;border-radius:9px;padding:13px}
.field input[type=range]{width:100%;accent-color:var(--accent);cursor:pointer;min-height:33px}
.check{display:flex;gap:12px;align-items:center;cursor:pointer;font-size:14px}.check input{width:19px;height:19px;accent-color:var(--accent)}.result{background:#e7f9f2;color:#133229;padding:30px;border-radius:16px;display:flex;flex-direction:column;justify-content:center}.result-label{text-transform:uppercase;letter-spacing:.12em;font-size:11px;font-weight:800}.result-number{font-size:clamp(38px,5vw,68px);font-weight:800;letter-spacing:-.08em;line-height:1.18;margin:18px 0}.result-note,.formula{font-size:13px;line-height:1.6}.formula{border-top:1px solid #b5d0c8;padding-top:17px;overflow-wrap:anywhere}
.chat-shell{background:#f7fbfc;color:#132432;border-radius:20px;overflow:hidden;max-width:880px;border:1px solid #c9d7dc;box-shadow:0 18px 54px #0003}
.chat-top{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;background:#142a38;color:#fff;padding:17px 22px}
.chat-top strong{font-size:16px}.chat-top small{display:block;color:#d2e5eb;font-size:12px;margin-top:3px}.reset{background:transparent;color:#fff;border:1px solid #617b8d;border-radius:7px;padding:8px 12px;font-size:12px}
.chat-log{height:310px;overflow-y:auto;padding:20px 23px;background:#f1f7f7;display:flex;flex-direction:column;gap:11px}
.chat-bubble{max-width:85%;border-radius:12px;padding:11px 14px;line-height:1.5;font-size:14px;white-space:pre-line;overflow-wrap:anywhere}
.chat-bubble.bot{align-self:flex-start;background:#fff;border:1px solid #d6e2e4}.chat-bubble.user{align-self:flex-end;background:#d2f4e5}
.chat-quick{display:flex;gap:8px;flex-wrap:wrap;padding:16px 20px;border-top:1px solid #dae5e8}.chat-quick button{font-size:12px;border:1px solid #8eb1b5;background:#fff;padding:8px 10px;border-radius:30px;color:#174355}
.chat-input{display:flex;gap:10px;padding:12px 20px 20px}.chat-input input{color:#17313d;background:#fff;border:1px solid #93aeb8;min-width:0}.chat-input button{border:0;border-radius:9px;background:#183444;color:#fff;padding:11px 21px}
.preview-bar{display:flex;flex-wrap:wrap;gap:11px;align-items:center;justify-content:space-between;margin-bottom:18px}
.switches,.filters{display:flex;flex-wrap:wrap;gap:8px}.switches button{background:#1b2a35;color:#cfdae2;border:1px solid #657682;border-radius:7px;padding:8px 15px}.switches button[aria-pressed=true]{background:#e6f9f3;color:#133026}
.preview-stage{background:repeating-linear-gradient(45deg,#1a2630,#1a2630 12px,#1e2b34 12px,#1e2b34 24px);padding:clamp(12px,3vw,42px);border:1px solid #4e5b67;border-radius:19px;overflow:hidden;min-height:440px}
.mock-site{margin:auto;width:100%;max-width:1020px;border-radius:12px;overflow:hidden;color:#273d3a;background:#f5f1e8;box-shadow:0 22px 75px #0007;transition:max-width .35s}
.mock-site.phone{max-width:355px}
.mock-top{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:20px 32px;font-size:12px}
.mock-brand{font-weight:950;font-size:25px;letter-spacing:-.07em;line-height:.8}.mock-brand span{display:block;font-size:8px;letter-spacing:.22em;margin-top:8px;font-weight:700}
.mock-menu{color:#687977}.mock-hero{padding:55px 34px 74px;display:grid;grid-template-columns:1fr .76fr;align-items:center;gap:17px;background:#f3eee3}
.mock-tag{color:#7c8c87;font-size:10px;letter-spacing:.17em;font-weight:800;text-transform:uppercase}.mock-hero h3{font-size:clamp(33px,4.7vw,65px);line-height:1.02;margin:12px 0;max-width:560px}
.mock-hero p{font-size:13px;line-height:1.6;max-width:430px}.mock-button{background:#25473e;border:0;padding:12px 17px;border-radius:5px;color:white;font-size:12px;margin-top:13px}
.mock-art{position:relative;min-height:310px;border-radius:120px 120px 8px 8px;overflow:hidden;background:linear-gradient(135deg,#acc2b4 0%,#e4d8c3 45%,#7f9e90 100%)}
.mock-art:before{content:"";position:absolute;top:14%;left:16%;width:62%;height:66%;background:linear-gradient(135deg,#d0c0a7,#f8eee1 45%,#bead9b);border:14px solid #4b635c;box-shadow:16px 20px 0 #657a73;transform:skewY(-4deg)}
.mock-art:after{content:"";position:absolute;left:0;right:0;bottom:-20%;height:55%;background:linear-gradient(130deg,#b7a28a,#eee2c9);transform:skewY(-18deg)}
.mock-cards{padding:30px 35px 39px;background:#fff}.mock-cards h4{margin:0 0 19px;font-size:18px}
.filters button{border:1px solid #cedad4;background:#f4f8f4;color:#304b42;padding:8px 12px;border-radius:24px;font-size:11px}
.filters button[aria-pressed=true]{background:#274b3f;color:white}.mock-card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:11px;margin-top:20px}
.mock-card{padding:16px;min-width:0;background:#f0f4ef;border-radius:8px}.mock-card b{display:block;font-size:13px}.mock-card p{font-size:11px;color:#62786e;margin:8px 0 0}.mock-card[hidden]{display:none}
.mock-fine{border-top:1px solid #dfe7df;padding:12px 35px;color:#6f817a;font-size:10px;background:#fff}
.mock-site.phone .mock-top{padding:16px 19px}.mock-site.phone .mock-menu{font-size:10px}.mock-site.phone .mock-hero{grid-template-columns:1fr;padding:27px 20px 30px}.mock-site.phone .mock-hero h3{font-size:34px}.mock-site.phone .mock-art{min-height:150px;max-height:150px;border-radius:100px 100px 5px 5px}.mock-site.phone .mock-cards{padding:20px}.mock-site.phone .mock-card-grid{grid-template-columns:1fr}.mock-site.phone .mock-fine{padding:12px 20px}
.final{padding:77px 0 92px}.final p{color:var(--muted);max-width:770px}.demo-footer{border-top:1px solid var(--line);padding:25px 0 40px;color:#a9bcc9}.demo-footer-inner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:13px;font-size:12px}.demo-footer a{margin-right:12px}
@media(max-width:800px){.demo-header{position:static}.calc-grid{grid-template-columns:1fr}.result{min-height:200px}.mock-hero{grid-template-columns:1fr}.mock-art{min-height:210px;max-height:300px}.mock-card-grid{grid-template-columns:1fr}.mock-menu{display:none}.mock-top,.mock-hero,.mock-cards{padding-left:18px;padding-right:18px}.mock-hero h3{font-size:40px}}
@media(max-width:470px){.container{padding:0 18px}.demo-nav{width:100%;gap:13px}.hero{padding:57px 0}.demo-section{padding:55px 0}.hero-anchors,.action-row{flex-direction:column;align-items:stretch}.action,.outline{width:100%;min-width:0;text-align:center}.chat-input{padding:12px}.chat-log{height:300px;padding:15px}.chat-quick{padding:11px}.chat-quick button{font-size:11px}.mock-cards{padding:18px}.preview-stage{padding:8px}.mock-site:not(.phone) .mock-hero{padding:26px 18px}.mock-site:not(.phone) .mock-art{min-height:160px;max-height:175px}.mock-site:not(.phone) .mock-hero h3{font-size:33px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important}}