:root {
  --bg: #000;
  --bg-2: #0b0b0c;
  --card: #111113;
  --line: #26262a;
  --text: #f5f5f2;
  --muted: #a3a3a0;
  --accent: #c6ff3d;
  --danger: #ff5a4d;
  --radius: 18px;
  --font: "Montserrat", system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { line-height: 1.1; font-weight: 800; letter-spacing: -0.02em; text-wrap: balance; }
h1 { font-size: clamp(2.6rem, 7vw, 5.2rem); }
h2 { font-size: clamp(1.8rem, 4vw, 3rem); }
h3 { font-size: 1.2rem; letter-spacing: -0.01em; }
a { color: inherit; }
em { font-style: normal; color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

.wrap { width: min(1720px, 100% - clamp(40px, 7vw, 144px)); margin-inline: auto; }
.wrap.narrow { width: min(780px, 100% - 40px); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--accent); color: #000; padding: 8px 14px; border-radius: 8px; z-index: 100; }
.skip:focus { left: 8px; }

.eyebrow { font-size: 0.78rem; font-weight: 600; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); margin-bottom: 16px; }
.fine { font-size: 0.8rem; color: var(--muted); line-height: 1.5; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--accent); color: #000; font: 600 1rem var(--font);
  padding: 14px 26px; border-radius: 999px; border: 1px solid var(--accent);
  text-decoration: none; cursor: pointer; transition: transform .2s, box-shadow .2s, background .2s;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 30px -10px var(--accent); }
.btn.ghost { background: transparent; color: var(--text); border-color: #444; }
.btn.ghost:hover { border-color: var(--text); box-shadow: none; }
.btn.small { padding: 9px 18px; font-size: 0.9rem; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(0,0,0,.78); backdrop-filter: blur(14px); border-bottom: 1px solid var(--line); }
.bar { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.mark { width: 44px; height: 40px; fill: var(--bg); stroke: var(--text); stroke-width: 11; }
.word { display: flex; flex-direction: column; line-height: 1; }
.word b { font-weight: 800; font-size: 1.15rem; letter-spacing: 0.01em; display: flex; align-items: baseline; }
.word span { font-size: 0.92rem; font-weight: 400; margin-top: 2px; }
.lam { height: 0.72em; width: 0.74em; fill: currentColor; margin: 0 0.02em; }
#nav { display: flex; align-items: center; gap: 26px; }
#nav a:not(.btn) { text-decoration: none; font-size: 0.9rem; font-weight: 500; color: var(--muted); transition: color .2s; }
#nav a:not(.btn):hover { color: var(--text); }
.nav-toggle { display: none; background: none; border: 0; width: 44px; height: 44px; cursor: pointer; padding: 12px 10px; }
.nav-toggle span { display: block; height: 2px; background: var(--text); margin: 6px 0; transition: transform .25s; }
.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }

/* Hero */
.hero { position: relative; padding: clamp(56px, 9vw, 120px) 0 clamp(48px, 7vw, 96px); overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(600px 400px at 78% 40%, rgba(198,255,61,.10), transparent 70%),
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 100% 64px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 64px 100%;
  mask-image: radial-gradient(ellipse at 60% 40%, #000 10%, transparent 75%);
  opacity: .55;
}
.hero-grid { position: relative; display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items: center; }
.lede { font-size: clamp(1.05rem, 1.6vw, 1.25rem); color: var(--muted); max-width: 56ch; margin-top: 24px; }
.rotator { margin-top: 22px; font-weight: 600; font-size: 1.05rem; min-height: 1.7em; }
#rot { color: var(--muted); text-decoration: line-through; text-decoration-color: var(--danger); text-decoration-thickness: 2px; display: inline-block; transition: opacity .35s, transform .35s; }
#rot.out { opacity: 0; transform: translateY(8px); }
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }

.hero-art { position: relative; --px: 0; --py: 0; }
.hero-art svg { width: 100%; height: auto; display: block; overflow: visible; }
.hl { fill: var(--bg); stroke: var(--text); stroke-width: 9; transition: transform .6s cubic-bezier(.2,.8,.2,1), stroke .3s; }
.hl1 { animation: float 6s ease-in-out infinite; transform: translate(calc(var(--px) * 14px), calc(var(--py) * 14px)); }
.hl2 { transform: translate(calc(var(--px) * 7px), calc(var(--py) * 7px)); }
.hl3 { animation: float 6s ease-in-out -3s infinite; transform: translate(calc(var(--px) * -6px), calc(var(--py) * -6px)); }
.hl1 use { stroke: var(--accent); }
@keyframes float { 50% { translate: 0 -12px; } }
.tag { position: absolute; right: 0; font-size: 0.72rem; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; padding: 5px 12px; border: 1px solid var(--line); border-radius: 999px; background: rgba(0,0,0,.7); color: var(--muted); }
.t1 { top: 22%; color: var(--accent); border-color: var(--accent); }
.t2 { top: 50%; }
.t3 { top: 70%; }

/* Sections */
.section { padding: clamp(64px, 9vw, 120px) 0; }
.section.alt { background: var(--bg-2); border-block: 1px solid var(--line); }
.sec-head { max-width: 900px; margin-bottom: 44px; }
.sec-head p:not(.eyebrow) { color: var(--muted); margin-top: 16px; }

.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s, transform .7s; }
.js .reveal.in { opacity: 1; transform: none; }

/* Simulation */
.sim-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(16px, 3vw, 30px); }
.sim-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.seg { display: inline-flex; background: #000; border: 1px solid var(--line); border-radius: 999px; padding: 4px; }
.seg button { font: 600 .92rem var(--font); color: var(--muted); background: none; border: 0; padding: 10px 20px; border-radius: 999px; cursor: pointer; transition: background .25s, color .25s; }
.seg button[aria-pressed="true"] { background: var(--text); color: #000; }
#modeAuto[aria-pressed="true"] { background: var(--accent); }
.link-btn { font: 500 .85rem var(--font); background: none; border: 0; color: var(--muted); text-decoration: underline; cursor: pointer; padding: 8px; }
#sim { display: block; width: 100%; height: 340px; margin-top: 18px; }
.sim-note { margin-top: 8px; font-weight: 500; min-height: 3.3em; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 18px 0 14px; }
.stats div { background: #000; border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; }
.stats dt { font-size: .72rem; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); }
.stats dd { margin: 4px 0 0; font-size: 1.7rem; font-weight: 800; font-variant-numeric: tabular-nums; }

/* Layers */
.layers { display: grid; grid-template-columns: .9fr 1.1fr; gap: 48px; align-items: center; }
.stack svg { width: 100%; max-width: 440px; display: block; margin-inline: auto; overflow: visible; }
.sl { cursor: pointer; fill: var(--bg-2); stroke: #6b6b68; stroke-width: 7; transition: transform .5s cubic-bezier(.2,.8,.2,1), stroke .3s, fill .3s; outline: none; }
.sl text { fill: var(--muted); stroke: none; font: 600 17px var(--font); text-anchor: middle; letter-spacing: .08em; text-transform: uppercase; transition: fill .3s; pointer-events: none; }
.sl:hover, .sl:focus-visible { stroke: var(--text); }
.sl.on { stroke: var(--accent); fill: #16200a; transform: translateY(-14px); }
.sl.on text { fill: var(--accent); }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(22px, 3vw, 38px); animation: fade .45s; }
.panel h3 { font-size: 1.6rem; margin-bottom: 14px; }
.panel h3 span { color: var(--accent); margin-right: 8px; }
.panel p { color: var(--muted); }
.panel ul { margin: 18px 0 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.panel li { padding-left: 26px; position: relative; }
.panel li::before { content: ""; position: absolute; left: 0; top: .6em; width: 12px; height: 2px; background: var(--accent); }
@keyframes fade { from { opacity: 0; transform: translateY(10px); } }

/* Use cases */
.tabs { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 26px; }
.tabs button { font: 600 .92rem var(--font); color: var(--muted); background: none; border: 1px solid var(--line); padding: 10px 20px; border-radius: 999px; cursor: pointer; transition: all .2s; }
.tabs button:hover { color: var(--text); border-color: #555; }
.tabs button[aria-selected="true"] { background: var(--text); color: #000; border-color: var(--text); }
.cases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.case { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; animation: fade .45s backwards; transition: border-color .25s, transform .25s; }
.case:hover { border-color: var(--accent); transform: translateY(-3px); }
.case:nth-child(2) { animation-delay: .05s; } .case:nth-child(3) { animation-delay: .1s; }
.case:nth-child(4) { animation-delay: .15s; } .case:nth-child(5) { animation-delay: .2s; } .case:nth-child(6) { animation-delay: .25s; }
.case h3 { margin-bottom: 14px; }
.case p { font-size: .93rem; padding-left: 62px; position: relative; line-height: 1.5; }
.case p::before { position: absolute; left: 0; top: .15em; font-size: .66rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; }
.case .b { color: var(--muted); margin-bottom: 10px; }
.case .b::before { content: "Before"; color: var(--danger); }
.case .a::before { content: "After"; color: var(--accent); }

/* Steps */
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; counter-reset: s; }
.steps li { border-top: 2px solid var(--line); padding-top: 22px; position: relative; }
.steps li::before { content: ""; position: absolute; top: -2px; left: 0; width: 48px; height: 2px; background: var(--accent); }
.steps span { font-size: .8rem; font-weight: 600; color: var(--accent); letter-spacing: .1em; }
.steps h3 { font-size: 1.4rem; margin: 8px 0 10px; }
.steps p { color: var(--muted); font-size: .95rem; }

/* Calculator */
.calc { display: grid; grid-template-columns: 1.1fr .9fr; gap: 20px; }
.calc-in, .calc-out { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(22px, 3vw, 36px); }
.calc-in { display: grid; gap: 26px; }
.calc-in label { display: grid; grid-template-columns: 1fr auto; gap: 10px; font-weight: 500; font-size: .95rem; }
.calc-in output { font-weight: 800; color: var(--accent); font-variant-numeric: tabular-nums; }
.calc-in input { grid-column: 1 / -1; width: 100%; accent-color: var(--accent); height: 28px; }
.calc-out { border-color: var(--accent); display: flex; flex-direction: column; }
.calc-out .k { font-size: .75rem; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); }
.calc-out .v { font-size: clamp(2.2rem, 5vw, 3.4rem); font-weight: 800; line-height: 1.1; margin: 4px 0 22px; font-variant-numeric: tabular-nums; }
.calc-out .accent { color: var(--accent); }
.calc-out .btn { margin-top: 22px; align-self: flex-start; }

/* FAQ */
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; list-style: none; padding: 22px 40px 22px 0; font-weight: 600; font-size: 1.08rem; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 50%; translate: 0 -50%; font-size: 1.6rem; font-weight: 400; color: var(--accent); transition: rotate .25s; }
.faq details[open] summary::after { rotate: 45deg; }
.faq details p { color: var(--muted); padding: 0 40px 24px 0; }

/* Contact */
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.contact > div p:not(.eyebrow) { color: var(--muted); margin-top: 18px; }
.contact .mail a { color: var(--accent); }
.form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(20px, 3vw, 32px); }
.form label { display: grid; gap: 6px; font-size: .85rem; font-weight: 500; color: var(--muted); }
.form .full { grid-column: 1 / -1; }
.form input, .form select, .form textarea { font: 400 1rem var(--font); color: var(--text); background: #000; border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; width: 100%; }
.form input:focus, .form select:focus, .form textarea:focus { outline: none; border-color: var(--accent); }
.form textarea { resize: vertical; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 44px 0; color: var(--muted); font-size: .92rem; }
.foot { display: grid; grid-template-columns: 1fr auto; gap: 20px 40px; align-items: start; }
.foot-brand { color: var(--text); font-weight: 800; font-size: 1.15rem; }
.foot nav { display: flex; flex-wrap: wrap; gap: 20px; }
.foot nav a { text-decoration: none; }
.foot nav a:hover { color: var(--text); }
.foot .fine { grid-column: 1 / -1; }

@media (max-width: 960px) {
  .nav-toggle { display: block; }
  #nav { position: absolute; top: 68px; left: 0; right: 0; background: #000; border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; gap: 0; padding: 8px 20px 20px; display: none; }
  #nav.open { display: flex; }
  #nav a:not(.btn) { padding: 14px 0; font-size: 1rem; border-bottom: 1px solid var(--line); }
  #nav .btn { margin-top: 16px; }
  .hero-grid, .layers, .calc, .contact { grid-template-columns: 1fr; }
  .hero-art { max-width: 380px; margin-inline: auto; width: 100%; }
  .cases { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr 1fr; gap: 32px 16px; }
  .stack svg { max-width: 320px; }
}
@media (max-width: 620px) {
  body { font-size: 16px; }
  .wrap, .wrap.narrow { width: calc(100% - 32px); }
  .cases, .form { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stats dd { font-size: 1.4rem; }
  .seg button { padding: 10px 14px; font-size: .85rem; }
  .foot { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
}