/* ГОСТ‑Веб3‑Мост landing — styles.css */
:root{
  --bg: #070A12;
  --bg2:#0B1020;
  --card:#0F1730;
  --card2:#0B1227;
  --text:#E9EEF9;
  --muted:#A9B3C7;
  --line: rgba(255,255,255,.10);

  --accent:#4BB6FF; /* electric blue */
  --accent2:#8B5CF6; /* violet */
  --accentGreen:#35FF6A; /* kept only for diagram harmony (sparingly) */
  --shadow: 0 18px 60px rgba(0,0,0,.45);

  --radius: 18px;
  --radius2: 26px;
}

[data-theme="light"]{
  --bg:#F6F7FB;
  --bg2:#FFFFFF;
  --card:#FFFFFF;
  --card2:#F3F5FA;
  --text:#0E162A;
  --muted:#50607A;
  --line: rgba(14,22,42,.12);
  --shadow: 0 18px 60px rgba(14,22,42,.12);
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color:var(--text);
  background: radial-gradient(900px 600px at 12% 18%, rgba(75,182,255,.14), transparent 55%),
              radial-gradient(800px 560px at 86% 22%, rgba(139,92,246,.14), transparent 60%),
              linear-gradient(180deg, var(--bg), var(--bg2));
  overflow-x:hidden;
}

a{ color:inherit; text-decoration:none; }
img{ max-width:100%; display:block; }

.container{
  width:min(1120px, calc(100% - 40px));
  margin:0 auto;
}

.sr{
  position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden;
  clip:rect(0,0,0,0); white-space:nowrap; border:0;
}

.skip{
  position:absolute;
  left:16px; top:10px;
  padding:10px 12px;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--line);
  transform: translateY(-200%);
  transition: transform .2s ease;
  z-index: 9999;
}
.skip:focus{ transform: translateY(0); }

/* Topbar */
.topbar{
  position:sticky; top:0; z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(7,10,18,.55);
  border-bottom: 1px solid var(--line);
}
[data-theme="light"] .topbar{
  background: rgba(246,247,251,.75);
}
.topbar.is-elevated{
  box-shadow: 0 10px 30px rgba(0,0,0,.25);
}
.topbar__inner{
  display:flex; align-items:center; justify-content:space-between;
  padding: 14px 0;
  gap: 16px;
}

.brand{ display:flex; align-items:center; gap:12px; }
.brand__mark{
  width: 16px; height:16px; border-radius:5px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  box-shadow: 0 0 0 4px rgba(75,182,255,.15);
}
.brand__text strong{ font-size:14px; letter-spacing:.2px; }
.brand__text small{
  display:block; margin-top:2px;
  color: var(--muted);
  font-size:12px;
}

.nav{ display:flex; align-items:center; gap:12px; }
.nav__links{
  display:flex; gap:18px; align-items:center;
}
.nav__links a{
  font-size:13px;
  color: var(--muted);
  padding:10px 10px;
  border-radius: 10px;
  transition: background .15s ease, color .15s ease;
}
.nav__links a:hover{
  color: var(--text);
  background: rgba(255,255,255,.06);
}

.nav__burger{
  display:none;
  width:44px; height:44px;
  border-radius: 12px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.04);
  cursor:pointer;
}
.nav__burger span{ display:block; height:2px; margin:6px 10px; background: var(--text); opacity:.85; }

.topbar__cta{ display:flex; gap:10px; align-items:center; }

.btn{
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  color: var(--text);
  padding: 11px 14px;
  border-radius: 14px;
  font-size: 13px;
  font-weight: 600;
  cursor:pointer;
  transition: transform .12s ease, background .12s ease, border-color .12s ease;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  user-select:none;
}
.btn:hover{ transform: translateY(-1px); background: rgba(255,255,255,.07); border-color: rgba(255,255,255,.16); }
.btn:active{ transform: translateY(0px); }

.btn--primary{
  border-color: rgba(75,182,255,.30);
  background: linear-gradient(135deg, rgba(75,182,255,.25), rgba(139,92,246,.16));
}
.btn--primary:hover{
  background: linear-gradient(135deg, rgba(75,182,255,.30), rgba(139,92,246,.20));
}
.btn--soft{
  border-color: rgba(255,255,255,.12);
  background: rgba(255,255,255,.06);
}
.btn--ghost{
  background: transparent;
}
.btn--sm{ padding: 8px 10px; border-radius: 12px; font-size: 12px; }

.icon{ font-size: 14px; line-height:1; }

.section{
  padding: 72px 0;
  position:relative;
}
.section--alt{
  background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,0));
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
[data-theme="light"] .section--alt{
  background: linear-gradient(180deg, rgba(14,22,42,.04), rgba(14,22,42,0));
}

.section__head{
  max-width: 760px;
  margin-bottom: 26px;
}
h1,h2,h3{ margin:0; letter-spacing: -0.02em; }
h1{ font-size: clamp(30px, 3.4vw, 44px); line-height: 1.08; }
h2{ font-size: clamp(22px, 2.4vw, 32px); line-height: 1.15; }
h3{ font-size: 16px; line-height:1.2; }
.lead{ font-size: 15px; line-height: 1.65; color: var(--muted); max-width: 620px; }
.muted{ color: var(--muted); font-size: 14px; line-height:1.6; }
.accent{ color: var(--accent); }

.divider{
  height:1px; background: var(--line); margin: 14px 0;
  width:100%;
}

/* Hero */
.hero{
  padding: 92px 0 54px;
  position:relative;
  overflow:hidden;
}
.hero__grid{
  display:grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 34px;
  align-items: start;
  position:relative;
  z-index:2;
}
.pill{
  display:inline-flex; align-items:center; gap:10px;
  padding: 9px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  color: var(--muted);
  font-size: 12px;
}
.dot{
  width: 9px; height:9px; border-radius:50%;
  background: var(--accent);
  box-shadow: 0 0 0 6px rgba(75,182,255,.14);
}
.hero__copy{ padding-top: 10px; }
.hero__actions{ display:flex; gap: 12px; margin-top: 18px; flex-wrap:wrap; }
.hero__stats{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 26px;
}
.stat{
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  border-radius: 16px;
  padding: 12px 12px;
}
.stat__k{
  font-weight:800;
  font-size:12px;
  color: var(--accent);
  letter-spacing:.08em;
  text-transform: uppercase;
}
.stat__v{
  margin-top: 6px;
  font-size: 12px;
  color: var(--muted);
  line-height:1.5;
}

.hero__visual{
  position:relative;
}
.glass{
  border-radius: var(--radius2);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  padding: 14px;
  box-shadow: var(--shadow);
}
.glass img{
  border-radius: calc(var(--radius2) - 10px);
}
.hero__badges{
  display:grid;
  gap: 10px;
  margin-top: 12px;
}
.badge{
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  padding: 12px 12px;
}
.badge__title{ font-weight: 700; font-size: 13px; }
.badge__text{ margin-top:6px; font-size:12px; color: var(--muted); line-height:1.5; }

.bg{ position:absolute; inset:0; z-index:1; pointer-events:none; }
.blob{
  position:absolute;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  filter: blur(40px);
  opacity: .55;
  transform: translate3d(0,0,0);
}
.blob--1{
  left:-200px; top:-180px;
  background: radial-gradient(circle at 30% 30%, rgba(139,92,246,.55), rgba(139,92,246,0) 60%);
}
.blob--2{
  right:-240px; top:-160px;
  background: radial-gradient(circle at 30% 30%, rgba(139,92,246,.55), rgba(139,92,246,0) 60%);
}
.gridlines{
  position:absolute; inset:-40% -20%;
  background-image: linear-gradient(var(--line) 1px, transparent 1px),
                    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  transform: rotate(8deg);
  opacity: .25;
}

/* Layout blocks */
.split{
  display:grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 22px;
  align-items:start;
}
.card{
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  padding: 16px 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,.18);
}
.card--outline{
  background: rgba(255,255,255,.03);
}
.card__title{ margin-bottom: 8px; }
.list{
  margin: 12px 0 0;
  padding: 0 0 0 18px;
  color: var(--muted);
}
.list li{ margin: 8px 0; line-height:1.6; }

/* How it works */
.flow{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  align-items:start;
}
.flow__title{
  font-weight:800;
  letter-spacing:.04em;
  text-transform:uppercase;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 10px;
}
.steps{
  list-style:none; padding:0; margin:0;
  display:grid; gap: 10px;
}
.step{
  display:flex; gap: 12px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  padding: 12px 12px;
}
.step__n{
  width: 30px; height: 30px;
  border-radius: 10px;
  background: rgba(75,182,255,.18);
  border: 1px solid rgba(75,182,255,.28);
  color: var(--accent);
  display:flex; align-items:center; justify-content:center;
  font-weight:800;
  flex: 0 0 auto;
}
.step__t{ font-weight: 700; font-size: 13px; }
.step__d{ color: var(--muted); font-size: 13px; line-height:1.55; margin-top: 4px; }

.codebox{
  margin-top: 18px;
  border-radius: var(--radius2);
  border: 1px solid var(--line);
  background: rgba(0,0,0,.20);
  overflow:hidden;
}
[data-theme="light"] .codebox{ background: rgba(14,22,42,.05); }
.codebox__head{
  display:flex; justify-content:space-between; align-items:center;
  padding: 12px 12px;
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,.03);
}
.codebox__title{ font-weight: 700; font-size: 13px; }
pre{
  margin:0;
  padding: 14px 14px;
  overflow:auto;
  font-size: 12px;
  line-height:1.55;
}
code{ font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace; }
.codebox__hint{ padding: 10px 12px 14px; }

/* Feature grid */
.grid{
  display:grid;
  gap: 14px;
}
.grid--3{ grid-template-columns: repeat(3, 1fr); }
.chips{ display:flex; gap: 10px; flex-wrap:wrap; margin-top: 14px; }
.chip{
  font-size: 12px;
  color: var(--muted);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  padding: 8px 10px;
  border-radius: 999px;
}

/* Timeline */
.timeline{
  display:grid;
  gap: 10px;
}
.tl{
  display:grid;
  grid-template-columns: 190px 1fr;
  gap: 14px;
  padding: 14px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
}
.tl__k{
  font-weight:800;
  color: var(--accent);
  letter-spacing:.06em;
  text-transform: uppercase;
  font-size: 12px;
}
.tl__v{ color: var(--muted); font-size: 13px; line-height:1.6; }

/* FAQ */
.faq{
  display:grid;
  gap: 10px;
}
.qa{
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  padding: 12px 12px;
}
.qa summary{
  cursor:pointer;
  font-weight: 700;
  font-size: 13px;
  list-style:none;
}
.qa summary::-webkit-details-marker{ display:none; }
.qa p{ margin: 10px 0 0; }

/* CTA */
.cta{
  margin-top: 20px;
  border-radius: var(--radius2);
  border: 1px solid rgba(75,182,255,.26);
  background: linear-gradient(135deg, rgba(75,182,255,.12), rgba(139,92,246,.08));
  padding: 16px 16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 14px;
}
.cta__copy h3{ margin-bottom: 6px; }

/* Footer */
.footer{
  padding: 28px 0;
  border-top: 1px solid var(--line);
  background: rgba(255,255,255,.02);
}
.footer__inner{
  display:flex; justify-content:space-between; align-items:center;
  gap: 14px;
}
.footer__brand{ font-weight:800; font-size: 14px; margin-bottom: 4px; }
.footer__meta{ display:flex; gap: 10px; align-items:center; }
.footer__actions{ display:flex; gap: 10px; align-items:center; }

/* Modal */
.modal{
  position:fixed; inset:0;
  display:none;
  z-index: 80;
}
.modal.is-open{ display:block; }
.modal__bg{
  position:absolute; inset:0;
  background: rgba(0,0,0,.55);
  backdrop-filter: blur(3px);
}
.modal__panel{
  position:relative;
  width:min(560px, calc(100% - 28px));
  margin: 90px auto;
  border-radius: var(--radius2);
  border: 1px solid var(--line);
  background: var(--card);
  box-shadow: var(--shadow);
  padding: 16px 16px;
}
.modal__head{
  display:flex; align-items:center; justify-content:space-between;
  gap: 10px;
  margin-bottom: 10px;
}
.modal__head h3{ font-size: 16px; }

.form{
  display:grid;
  gap: 12px;
  margin-top: 12px;
}
label span{
  display:block;
  font-size: 12px;
  color: var(--muted);
  margin: 0 0 6px;
}
input, textarea{
  width:100%;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  color: var(--text);
  padding: 12px 12px;
  font-size: 13px;
  outline:none;
}
input::placeholder, textarea::placeholder{ color: rgba(169,179,199,.75); }
[data-theme="light"] input, [data-theme="light"] textarea{
  background: rgba(14,22,42,.04);
}
.form__actions{
  display:flex;
  justify-content:flex-end;
  gap: 10px;
}

.toast{
  display:none;
  margin-top: 12px;
  border-radius: 14px;
  border: 1px solid rgba(75,182,255,.25);
  background: rgba(75,182,255,.10);
  padding: 10px 12px;
  color: var(--text);
  font-size: 13px;
}
.toast.is-show{ display:block; }

/* Reveal animation */
[data-reveal]{
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .45s ease, transform .45s ease;
}
[data-reveal].is-in{
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 960px){
  .hero__grid{ grid-template-columns: 1fr; }
  .hero{ padding-top: 84px; }
  .hero__stats{ grid-template-columns: 1fr; }
  .split{ grid-template-columns: 1fr; }
  .flow{ grid-template-columns: 1fr; }
  .grid--3{ grid-template-columns: 1fr; }
  .tl{ grid-template-columns: 1fr; }
  .footer__inner{ flex-direction:column; align-items:flex-start; }
  .cta{ flex-direction:column; align-items:flex-start; }
  .topbar__inner{ gap: 10px; }
  .nav__burger{ display:inline-block; }
  .nav__links{
    position:absolute;
    right: 20px; top: 64px;
    width: min(340px, calc(100% - 40px));
    display:none;
    flex-direction:column;
    gap: 6px;
    padding: 10px;
    border-radius: 18px;
    border: 1px solid var(--line);
    background: rgba(7,10,18,.78);
    box-shadow: var(--shadow);
  }
  [data-theme="light"] .nav__links{ background: rgba(246,247,251,.92); }
  .nav__links.is-open{ display:flex; }
}

@media (prefers-reduced-motion: reduce){
  *{ scroll-behavior:auto !important; transition:none !important; }
  [data-reveal]{ opacity: 1; transform:none; }
}