:root {
  --bg: #0d121b; --bg2: #111827; --panel: #151c28; --line: #243048; --text: #eaf1fb; --muted: #93a1b8;
  --mint: #3dd6a0; --cyan: #4dd7ff; --amber: #ffd21f; --pink: #ff5fa2;
  --display: 'Unbounded', system-ui, sans-serif; --body: 'Manrope', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --wrap: 1180px; --r: 18px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.6 var(--body); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--cyan); }
h1, h2, h3 { font-family: var(--display); line-height: 1.15; letter-spacing: -0.01em; margin: 0 0 .5em; }
h2 { font-size: clamp(26px, 3.4vw, 40px); }
h3 { font-size: 20px; }
p { margin: 0 0 1em; }
code { font-family: ui-monospace, Menlo, monospace; font-size: .9em; background: #0a0f17; padding: 1px 6px; border-radius: 6px; color: var(--mint); }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }
.muted { color: var(--muted); } .small { font-size: 14px; }
.skip { position: absolute; left: -999px; } .skip:focus { left: 12px; top: 12px; z-index: 99; background: #000; padding: 8px 12px; }
.sub { color: var(--muted); max-width: 760px; font-size: 18px; margin-bottom: 36px; }
.grad { background: linear-gradient(92deg, var(--mint), var(--cyan) 55%, var(--amber)); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* кнопки */
.btn { font: 700 16px/1 var(--body); border-radius: 14px; padding: 13px 20px; border: 1px solid var(--line); background: #172033; color: var(--text); cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; gap: 8px; transition: transform .15s, box-shadow .2s, background .2s; }
.btn:hover { transform: translateY(-1px); }
.btn.ghost { background: transparent; }
.btn.ghost:hover { background: #172033; }
.btn.glow { border: 0; color: #04150e; background: linear-gradient(135deg, var(--mint), var(--cyan)); box-shadow: 0 8px 30px #3dd6a055; }
.btn.glow:hover { box-shadow: 0 10px 40px #4dd7ff66; }
.btn.big { padding: 17px 26px; font-size: 18px; }
.btn.wide { width: 100%; justify-content: center; }

/* шапка */
.top { position: sticky; top: 0; z-index: 20; background: #0d121bcc; backdrop-filter: blur(12px); border-bottom: 1px solid #ffffff10; }
.top-in { display: flex; align-items: center; gap: 24px; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font: 700 17px var(--display); white-space: nowrap; }
.logo b { color: var(--mint); }
.logo-mark { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; background: linear-gradient(135deg, var(--mint), #2f7bff); }
.nav { display: flex; gap: 22px; margin-left: 8px; }
.nav a { color: var(--muted); text-decoration: none; font-weight: 600; }
.nav a:hover { color: var(--text); }
.top-cta { margin-left: auto; display: flex; gap: 10px; }
.top-cta .btn { padding: 10px 16px; font-size: 15px; }

/* герой */
.hero { position: relative; overflow: hidden; min-height: min(86vh, 820px); display: flex; align-items: center; }
.hero-img { position: absolute; inset: 0; }
.hero-img img { width: 100%; height: 100%; object-fit: cover; object-position: 70% 50%; }
.hero::after { content: ''; position: absolute; inset: 0; background: linear-gradient(90deg, #0d121b 0%, #0d121bee 34%, #0d121b55 60%, transparent 80%), linear-gradient(0deg, #0d121b 0%, transparent 25%); }
.hero-in { position: relative; z-index: 1; padding-top: 60px; padding-bottom: 60px; }
.hero h1 { font-size: clamp(32px, 4.6vw, 62px); max-width: 720px; }
.eyebrow { display: inline-block; color: var(--mint); font-weight: 800; font-size: 14px; letter-spacing: .12em; text-transform: uppercase; background: #12352b99; border: 1px solid #2a8f7566; padding: 6px 12px; border-radius: 30px; margin-bottom: 22px; }
.lead { font-size: clamp(17px, 1.5vw, 20px); color: #c7d3e4; max-width: 640px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 22px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; list-style: none; }
.chips li { font-size: 14px; color: #c7d3e4; background: #ffffff0d; border: 1px solid #ffffff14; border-radius: 30px; padding: 6px 12px; }

/* шаги */
.steps { padding: 90px 20px 40px; }
.step-list { list-style: none; padding: 0; margin: 30px 0 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; counter-reset: s; }
.step-list li { background: linear-gradient(180deg, #151c28, #111827); border: 1px solid var(--line); border-radius: var(--r); padding: 24px 22px; }
.step-list .n { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 12px; font: 800 20px var(--display); color: #04150e; background: linear-gradient(135deg, var(--amber), var(--mint)); margin-bottom: 16px; }
.step-list p { color: var(--muted); font-size: 16px; margin: 0; }

/* возможности */
.features { padding: 70px 0; background: radial-gradient(1200px 600px at 80% 0%, #10304455, transparent), radial-gradient(900px 500px at 0% 60%, #12352b44, transparent); }
.feat { display: grid; grid-template-columns: 1fr 1.25fr; gap: 48px; align-items: center; margin: 30px 0 80px; }
.feat.rev .feat-txt { order: 2; }
.feat-txt p { color: #c7d3e4; }
.ticks { list-style: none; padding: 0; margin: 16px 0 0; }
.ticks li { position: relative; padding-left: 30px; margin-bottom: 10px; color: #c7d3e4; }
.ticks li::before { content: '✓'; position: absolute; left: 0; top: 0; width: 20px; height: 20px; border-radius: 6px; display: grid; place-items: center; font-size: 13px; font-weight: 800; color: #04150e; background: var(--mint); }
.shot { margin: 0; }
.shot img, .gallery img { border-radius: 16px; border: 1px solid #ffffff1a; box-shadow: 0 30px 80px #000a, 0 0 0 1px #4dd7ff14; }
figcaption { color: var(--muted); font-size: 14px; margin-top: 10px; text-align: center; }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 20px 0 60px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; }
.card img { aspect-ratio: 1 / 0.78; object-fit: cover; width: 100%; }
.card h3, .card p { padding: 0 22px; } .card h3 { margin-top: 20px; } .card p { color: var(--muted); font-size: 16px; padding-bottom: 20px; }
.gallery { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.gallery figure { margin: 0; }

/* проекты */
.projects { padding: 80px 20px 40px; }
.proj-hero { border-radius: 22px; margin-bottom: 30px; border: 1px solid #ffffff14; }
.proj-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.proj { display: flex; flex-direction: column; gap: 6px; background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 18px; color: var(--text); text-decoration: none; transition: border-color .2s, transform .15s; }
.proj:hover { border-color: #3dd6a088; transform: translateY(-2px); }
.proj-h { display: flex; align-items: center; gap: 10px; font-weight: 800; }
.proj-e { font-size: 24px; } .proj-l { margin-left: auto; color: var(--amber); font-size: 13px; letter-spacing: 1px; }
.proj p { color: var(--muted); font-size: 15px; margin: 0; }
.proj .go { color: var(--mint); font-size: 14px; font-weight: 700; margin-top: auto; padding-top: 6px; }
.tag { display: inline-block; font-size: 12px; border-radius: 20px; padding: 2px 8px; background: #12352b; color: var(--mint); margin-right: 4px; }

/* детали */
.parts { padding: 60px 20px; }
.part-cloud { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.part-cloud li { background: #ffffff0a; border: 1px solid #ffffff14; border-radius: 30px; padding: 8px 14px; font-size: 15px; }

/* родителям */
.parents { padding: 80px 0; background: linear-gradient(180deg, transparent, #0f1826 30%, #0f1826 70%, transparent); }
.par-in { display: grid; grid-template-columns: 1.3fr 1fr; gap: 50px; align-items: center; }
.par-in img { border-radius: 22px; border: 1px solid #ffffff14; }

/* FAQ */
.faq { padding: 60px 20px; max-width: 900px; }
.faq details { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; margin-bottom: 10px; padding: 0 20px; }
.faq summary { cursor: pointer; font-weight: 800; padding: 18px 0; list-style: none; position: relative; padding-right: 30px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; position: absolute; right: 0; top: 14px; font-size: 24px; color: var(--mint); transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { color: #c7d3e4; padding-bottom: 18px; margin: 0; }

/* финальный призыв */
.start { padding: 90px 0; text-align: center; background: radial-gradient(700px 300px at 50% 60%, #3dd6a022, transparent); }
.start-in { max-width: 760px; }
.start .hero-cta { justify-content: center; }

.foot { border-top: 1px solid #ffffff10; padding: 40px 0; }
.foot-in { display: grid; grid-template-columns: 1.2fr 1fr 1.4fr; gap: 30px; align-items: start; }
.foot nav { display: flex; flex-direction: column; gap: 8px; } .foot nav a { color: var(--muted); text-decoration: none; }

/* окно входа */
dialog { width: min(440px, 94vw); background: var(--panel); color: var(--text); border: 1px solid var(--line); border-radius: 20px; padding: 26px 26px 20px; box-shadow: 0 40px 120px #000c; }
dialog::backdrop { background: #04070dcc; backdrop-filter: blur(4px); }
dialog h2 { font-size: 24px; }
.x-form { position: absolute; right: 14px; top: 12px; margin: 0; }
.x { background: none; border: 0; color: var(--muted); font-size: 20px; cursor: pointer; }
.tabs { display: flex; gap: 4px; background: var(--bg); padding: 4px; border-radius: 14px; margin-bottom: 16px; }
.tabs button { flex: 1; background: none; border: 0; padding: 10px; border-radius: 10px; color: var(--muted); font: 700 15px var(--body); cursor: pointer; }
.tabs button[aria-selected=true] { background: #1c2638; color: var(--text); }
#authForm label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; color: #c7d3e4; margin-bottom: 12px; }
#authForm input { background: var(--bg); color: var(--text); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; font: 16px var(--body); }
#authForm input:focus { outline: none; border-color: var(--mint); box-shadow: 0 0 0 3px #3dd6a033; }
.err { color: #ff8a8a; min-height: 20px; font-size: 14px; margin: 0 0 8px; }
dialog[data-mode=login] .reg-only, dialog[data-mode=reg] .login-only { display: none; }

@media (max-width: 1000px) {
  .nav { display: none; }
  .step-list { grid-template-columns: repeat(2, 1fr); }
  .feat, .par-in { grid-template-columns: 1fr; gap: 26px; }
  .feat.rev .feat-txt { order: 0; }
  .grid3 { grid-template-columns: 1fr 1fr; }
  .foot-in { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  body { font-size: 16px; }
  .top-in { gap: 10px; }
  .top-cta .glow:not(.keep) { display: none; }
  .hide-m { display: none; }
  .top-cta .ghost { padding: 9px 14px; }
  .logo { font-size: 14px; } .logo-mark { width: 30px; height: 30px; }
  .eyebrow { letter-spacing: .06em; font-size: 12px; }
  .hero-in { padding-bottom: 20px; }
  .steps { padding-top: 50px; }
  .hero { min-height: auto; flex-direction: column; align-items: stretch; }
  .hero-img { position: relative; height: 56vw; }
  .hero::after { background: linear-gradient(0deg, #0d121b 0%, #0d121b 42%, transparent 62%); }
  .hero-in { padding-top: 0; margin-top: -12vw; }
  .step-list, .grid3, .gallery { grid-template-columns: 1fr; }
  .steps, .projects, .parts, .faq { padding-left: 16px; padding-right: 16px; }
  .wrap { padding: 0 16px; }
  .btn.big { width: 100%; justify-content: center; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; scroll-behavior: auto !important; } }