:root {
    --bg: #0d1117; --bg2: #11161f; --panel: #151a22; --panel2: #1b2230; --line: #263042;
    --text: #e8eaed; --dim: #9aa4b2; --accent: #3d7bff; --accent2: #85b8ff; --warn: #f5c542; --good: #3ccf86;
    color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.55 -apple-system, "Segoe UI", Roboto, Inter, system-ui, sans-serif; }
a { color: var(--accent2); }
img { max-width: 100%; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 12px; }
h1 { font-size: clamp(30px, 5vw, 48px); font-weight: 800; }
h2 { font-size: clamp(24px, 3.4vw, 32px); font-weight: 800; }
h3 { font-size: 18px; }
p { margin: 0 0 14px; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.dim { color: var(--dim); }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; color: var(--text); text-decoration: none; }
.brand img { width: 34px; height: 34px; }
.brand b { color: var(--accent); }

/* Header */
header { position: sticky; top: 0; z-index: 30; background: rgba(13,17,23,.85); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
header .wrap { display: flex; align-items: center; gap: 18px; height: 64px; }
nav.main { display: flex; gap: 4px; margin-left: auto; align-items: center; }
nav.main a { color: var(--dim); text-decoration: none; padding: 8px 12px; border-radius: 8px; font-weight: 600; font-size: 15px; }
nav.main a:hover { color: var(--text); background: var(--panel2); }
nav.main a.cta { background: var(--accent); color: #fff; }
.menu-btn { display: none; margin-left: auto; background: var(--panel2); border: 1px solid var(--line); color: var(--text); border-radius: 8px; padding: 8px 12px; font: inherit; cursor: pointer; }
@media (max-width: 900px) {
    .menu-btn { display: block; }
    nav.main { display: none; position: absolute; left: 0; right: 0; top: 64px; flex-direction: column; align-items: stretch; background: var(--bg2); border-bottom: 1px solid var(--line); padding: 10px 20px 16px; }
    nav.main.open { display: flex; }
}

/* Buttons & cards */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: 10px; font-weight: 700; text-decoration: none; border: 1px solid var(--line); background: var(--panel2); color: var(--text); cursor: pointer; font: inherit; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.big { font-size: 17px; padding: 14px 24px; }
.btn:hover { filter: brightness(1.08); }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 24px; }
.grid { display: grid; gap: 18px; }
.grid.c2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid.c3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.grid.c4 { grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
section { padding: 72px 0; }
section.alt { background: var(--bg2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.eyebrow { color: var(--accent2); font-weight: 700; letter-spacing: .12em; text-transform: uppercase; font-size: 12px; margin-bottom: 10px; }
.lead { font-size: 18px; color: var(--dim); max-width: 760px; }

/* Hero */
.hero { padding: 80px 0 56px; background: radial-gradient(900px 420px at 15% -10%, rgba(61,123,255,.25), transparent 60%), radial-gradient(700px 400px at 95% 10%, rgba(133,184,255,.12), transparent 60%); }
.hero .row { display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items: center; }
@media (max-width: 900px) { .hero .row { grid-template-columns: 1fr; } }
.hero .actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 22px; }
.mock { background: linear-gradient(160deg, #141a24, #0b0e14); border: 1px solid var(--line); border-radius: 18px; padding: 18px; box-shadow: 0 30px 60px rgba(0,0,0,.45); }
.mock .bar { display: flex; gap: 8px; margin-bottom: 14px; }
.mock .bar span { padding: 7px 14px; border-radius: 999px; background: var(--panel2); font-size: 13px; color: var(--dim); }
.mock .bar span.on { background: var(--accent); color: #fff; }
.mock .tiles { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.mock .tiles i { display: block; aspect-ratio: 2/3; border-radius: 8px; background: linear-gradient(180deg, var(--panel2), #0f141c); border: 1px solid var(--line); }
.mock .tiles i:nth-child(3n) { background: linear-gradient(180deg, #243a6b, #0f141c); }
.mock .line { height: 8px; border-radius: 4px; background: var(--panel2); margin-top: 12px; width: 60%; }

/* Advisory */
.advisory { border: 1px solid rgba(245,197,66,.5); background: rgba(245,197,66,.08); border-radius: 14px; padding: 18px 20px; display: flex; gap: 14px; align-items: flex-start; }
.advisory b { color: var(--warn); }
.advisory .i { font-size: 22px; line-height: 1; }

/* Features */
.feat { display: flex; gap: 14px; }
.feat .ic { width: 42px; height: 42px; border-radius: 10px; background: rgba(61,123,255,.18); color: var(--accent2); display: grid; place-items: center; font-size: 20px; flex: none; }
.feat h3 { margin-bottom: 6px; }
.feat p { color: var(--dim); margin: 0; font-size: 15px; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip { padding: 10px 16px; border-radius: 999px; background: var(--panel2); border: 1px solid var(--line); font-weight: 600; }

/* Steps */
.steps { counter-reset: s; display: grid; gap: 14px; }
.step { display: flex; gap: 16px; align-items: flex-start; }
.step::before { counter-increment: s; content: counter(s); width: 34px; height: 34px; border-radius: 50%; background: var(--accent); color: #fff; font-weight: 800; display: grid; place-items: center; flex: none; }
code, kbd { background: var(--panel2); border: 1px solid var(--line); border-radius: 6px; padding: 2px 7px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 14px; }

/* FAQ */
details.faq { border: 1px solid var(--line); border-radius: 12px; background: var(--panel); margin-bottom: 10px; }
details.faq summary { cursor: pointer; padding: 16px 20px; font-weight: 700; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after { content: "+"; color: var(--accent2); font-weight: 800; }
details.faq[open] summary::after { content: "–"; }
details.faq .a { padding: 0 20px 18px; color: var(--dim); }
details.faq .a p:last-child { margin: 0; }
.faq-group h3 { margin: 26px 0 12px; color: var(--accent2); font-size: 15px; text-transform: uppercase; letter-spacing: .1em; }

/* Legal */
.legal h2 { margin-top: 40px; }
.legal h3 { margin-top: 24px; }
.legal ul { color: var(--dim); }
.legal .meta { color: var(--dim); font-size: 14px; }
.toc a { display: inline-block; margin: 0 14px 8px 0; }

footer { border-top: 1px solid var(--line); padding: 36px 0; color: var(--dim); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 14px 28px; align-items: center; justify-content: space-between; }
footer a { color: var(--dim); }

/* Legal-use gate */
.gate { position: fixed; inset: 0; z-index: 100; background: rgba(5,8,12,.8); display: none; place-items: center; padding: 20px; }
.gate.show { display: grid; }
.gate .box { background: var(--panel); border: 1px solid var(--line); border-radius: 18px; max-width: 640px; width: 100%; padding: 28px; max-height: 90vh; overflow: auto; }
.gate h2 { margin-top: 0; }
.gate ul { color: var(--dim); }
.gate .row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }