:root {
  --bg: #fff; --ink: #0f1115; --ink-2: #333336; --faint: #6e6e76; --line: rgba(15,17,21,.08);
  --card: #fff; --card-line: rgba(15,17,21,.07); --card-shadow: 0 4px 18px -8px rgba(15,17,21,.16), inset 0 1px 0 #fff;
  --glass: rgba(255,255,255,.78); --blue: #0017d4; --blue-hover: #1a30e6; --blue-ink: #0017d4; --blue-wash: #e8ebfc;
  --field: #f5f5f7; --err: #d70015;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0b0f; --ink: #f5f5f7; --ink-2: #d2d2d7; --faint: #a1a1a6; --line: rgba(255,255,255,.08);
    --card: #121214; --card-line: rgba(255,255,255,.06); --card-shadow: 0 4px 20px 2px rgba(0,0,0,.18);
    --glass: rgba(29,29,34,.74); --blue: #4c63fa; --blue-hover: #3d55f0; --blue-ink: #8594ff; --blue-wash: #1a1f45;
    --field: #1d1d22; --err: #ff6961;
  }
}
:root[data-theme="dark"] {
  --bg: #0b0b0f; --ink: #f5f5f7; --ink-2: #d2d2d7; --faint: #a1a1a6; --line: rgba(255,255,255,.08);
  --card: #121214; --card-line: rgba(255,255,255,.06); --card-shadow: 0 4px 20px 2px rgba(0,0,0,.18);
  --glass: rgba(29,29,34,.74); --blue: #4c63fa; --blue-hover: #3d55f0; --blue-ink: #8594ff; --blue-wash: #1a1f45;
  --field: #1d1d22; --err: #ff6961;
}
* { box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.55 Inter, system-ui, -apple-system, "Segoe UI", sans-serif; }
a { color: inherit; }

.nav { position: sticky; top: 12px; z-index: 5; max-width: 980px; margin: 12px auto 0; padding: 0 16px; }
.nav-in { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 10px 12px 10px 18px;
  background: var(--glass); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px);
  border: 1px solid var(--card-line); border-radius: 999px; box-shadow: var(--card-shadow); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: .02em; text-decoration: none; }
.logo { width: 28px; height: 28px; border-radius: 8px; background: var(--blue); display: grid; place-items: center; }
.logo svg { width: 16px; height: 16px; }
.brand small { font: 500 12px/1 "JetBrains Mono", ui-monospace, monospace; color: var(--faint); letter-spacing: 0; }

.hero { max-width: 760px; margin: 0 auto; padding: 72px 16px 24px; text-align: center; }
.eyebrow { color: var(--blue-ink); font-weight: 600; font-size: 14px; margin: 0 0 14px; }
h1 { font-weight: 800; font-size: clamp(44px, 9vw, 76px); line-height: 1.02; letter-spacing: -.035em; margin: 0; text-wrap: balance; }
h1 span { display: block; color: var(--blue-ink); }
.lead { color: var(--ink-2); font-size: clamp(17px, 2.3vw, 20px); max-width: 560px; margin: 20px auto 0; text-wrap: balance; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font: 600 16px Inter, system-ui, sans-serif;
  background: var(--blue); color: #fff; border: 0; border-radius: 999px; padding: 14px 26px; text-decoration: none; cursor: pointer;
  transition: background .15s; }
.btn:hover { background: var(--blue-hover); }
.btn.ghost { background: transparent; color: var(--blue-ink); box-shadow: inset 0 0 0 1.5px var(--blue); }
.btn.ghost:hover { background: var(--blue-wash); }
.btn:focus-visible, input:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }

.card { background: var(--card); border: 1px solid var(--card-line); border-radius: 28px; box-shadow: var(--card-shadow); }

.login { max-width: 420px; margin: 36px auto 0; padding: 28px; display: grid; gap: 14px; text-align: left; }
.login label { display: grid; gap: 7px; font-size: 14px; font-weight: 500; color: var(--ink-2); }
.login input { font: inherit; color: var(--ink); background: var(--field); border: 1px solid transparent; border-radius: 14px; padding: 13px 15px; }
.login .btn { width: 100%; margin-top: 6px; }
.err { display: none; margin: 0; color: var(--err); font-size: 14px; font-weight: 500; }
.err.on { display: block; }
.fine { text-align: center; color: var(--faint); font-size: 14px; margin: 18px 0 0; }

.cta { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 32px; }
.meta { font: 13px "JetBrains Mono", ui-monospace, monospace; color: var(--faint); margin-top: 14px; }

.wrap { max-width: 980px; margin: 0 auto; padding: 48px 16px 72px; }
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
@media (max-width: 900px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .grid { grid-template-columns: 1fr; } }
.step { padding: 26px; }
.step b { display: block; font: 600 13px "JetBrains Mono", ui-monospace, monospace; color: var(--blue-ink); margin-bottom: 10px; }
.step h3 { margin: 0 0 6px; font-size: 19px; letter-spacing: -.01em; }
.step p { margin: 0; color: var(--ink-2); font-size: 15px; }
h2 { font-weight: 800; font-size: clamp(30px, 5vw, 44px); letter-spacing: -.03em; line-height: 1.08; margin: 64px 0 20px; text-align: center; text-wrap: balance; }
h2 span { color: var(--blue-ink); }
.speed { padding: 8px 26px; }
.row { display: flex; justify-content: space-between; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.row:last-child { border-bottom: 0; }
.row span:first-child { font-weight: 600; }
.row span:last-child { color: var(--ink-2); text-align: right; }
code { font: 14px "JetBrains Mono", ui-monospace, monospace; background: var(--field); border-radius: 8px; padding: 2px 7px; }
.prompts { display: grid; gap: 10px; }
.prompt { padding: 16px 20px; border-radius: 20px; font-size: 15px; color: var(--ink-2); }
.note { margin: 56px auto 0; max-width: 620px; text-align: center; color: var(--faint); font-size: 13px; }
@media (max-width: 560px) { .row { flex-direction: column; gap: 4px; } .row span:last-child { text-align: left; } .hero { padding-top: 52px; } }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }