:root {
  --bg: #ffffff;
  --bg-alt: #f4f6fa;
  --text: #1a1f2b;
  --muted: #5b6475;
  --border: #e2e6ee;
  --accent: #2f5bea;
  --accent-hover: #2148c7;
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1218;
    --bg-alt: #161a22;
    --text: #e8ebf2;
    --muted: #9aa3b5;
    --border: #262c38;
    --accent: #6d8dff;
    --accent-hover: #8ba4ff;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* Header */
.header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.logo { font-weight: 700; color: var(--text); white-space: nowrap; }
.logo__mark { color: var(--accent); font-family: ui-monospace, Consolas, monospace; margin-right: 4px; }
.nav { display: flex; gap: 24px; }
.nav a { color: var(--muted); font-size: 15px; }
.nav a:hover { color: var(--text); }

/* Hero */
.hero { padding: 96px 0 80px; }
.hero__tag {
  display: inline-block; margin: 0 0 16px; padding: 4px 12px;
  font-size: 14px; color: var(--accent);
  border: 1px solid var(--border); border-radius: 999px;
}
.hero h1 { font-size: clamp(32px, 5vw, 52px); line-height: 1.15; margin: 0 0 20px; max-width: 800px; letter-spacing: -0.02em; }
.hero__lead { font-size: 19px; color: var(--muted); max-width: 680px; margin: 0 0 32px; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; }

.btn { display: inline-block; padding: 12px 22px; border-radius: 10px; font-weight: 600; transition: background .15s, border-color .15s; }
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--accent-hover); color: #fff; }
.btn--ghost { border: 1px solid var(--border); color: var(--text); }
.btn--ghost:hover { border-color: var(--accent); color: var(--text); }

/* Sections */
.section { padding: 72px 0; }
.section--alt { background: var(--bg-alt); }
.section h2 { font-size: 32px; margin: 0 0 32px; letter-spacing: -0.01em; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; }
.card { padding: 28px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg); }
.card__code { font-family: ui-monospace, Consolas, monospace; font-size: 13px; color: var(--accent); margin-bottom: 10px; }
.card h3 { margin: 0 0 10px; font-size: 20px; }
.card p { margin: 0; color: var(--muted); }

.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; counter-reset: step; }
.steps li {
  position: relative; counter-increment: step;
  display: flex; flex-direction: column; gap: 8px;
  padding: 24px 22px;
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius);
  transition: transform .2s, border-color .2s, box-shadow .2s;
}
.steps li:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 14px 32px -14px color-mix(in srgb, var(--accent) 45%, transparent);
}
.steps li::before {
  content: counter(step, decimal-leading-zero);
  display: grid; place-items: center;
  width: 44px; height: 44px; margin-bottom: 10px;
  border-radius: 12px;
  font: 600 15px/1 ui-monospace, Consolas, monospace;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
}
.steps li:hover::before { background: var(--accent); color: #fff; }
/* connector between steps */
.steps li:not(:last-child)::after {
  content: ""; position: absolute;
  top: 46px; right: -21px; width: 20px; height: 2px;
  background: color-mix(in srgb, var(--accent) 45%, transparent);
}
.steps strong { font-size: 18px; }
.steps span { color: var(--muted); font-size: 15px; line-height: 1.5; }

@media (max-width: 960px) {
  .steps { grid-template-columns: 1fr; gap: 14px; }
  .steps li { display: grid; grid-template-columns: 44px 1fr; column-gap: 18px; row-gap: 2px; padding: 20px 22px; }
  .steps li::before { grid-row: span 2; margin-bottom: 0; }
  .steps li:not(:last-child)::after { top: auto; bottom: -15px; right: auto; left: 43px; width: 2px; height: 14px; }
}

.req { display: grid; grid-template-columns: 260px 1fr; margin: 0; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.req dt, .req dd { margin: 0; padding: 14px 20px; border-bottom: 1px solid var(--border); }
.req dt { color: var(--muted); background: var(--bg-alt); }
.req dd { overflow-wrap: anywhere; }
.req dt:last-of-type, .req dd:last-of-type { border-bottom: 0; }

.section__lead { margin: -16px 0 28px; color: var(--muted); }

.form { display: flex; flex-direction: column; gap: 18px; max-width: 720px; }
.form__row { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.form__honey { position: absolute; left: -9999px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field__label { font-size: 14px; color: var(--muted); }
.field input, .field textarea {
  font: inherit; color: var(--text); background: var(--bg);
  padding: 12px 14px; border: 1px solid var(--border); border-radius: 10px;
  resize: vertical;
}
.field input:focus, .field textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 20%, transparent); }
.check { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; color: var(--muted); }
.check input { margin-top: 4px; accent-color: var(--accent); }
.form__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }
button.btn { border: 0; cursor: pointer; font: inherit; font-weight: 600; }
.btn:disabled { opacity: .6; cursor: default; }
.form__status { font-size: 15px; color: var(--muted); }
.form__status--ok { color: #1f9d55; }
.form__status--err { color: #d64545; }

/* Footer */
.footer { padding: 28px 0; border-top: 1px solid var(--border); font-size: 14px; color: var(--muted); }
.footer__inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }

/* Privacy page */
.doc { padding: 56px 0 72px; max-width: 800px; }
.doc h1 { font-size: 34px; line-height: 1.2; margin: 0 0 24px; }
.doc h2 { font-size: 22px; margin: 32px 0 12px; }

@media (max-width: 720px) {
  .nav { display: none; }
  .hero { padding: 64px 0 56px; }
  .section { padding: 56px 0; }
  .req { grid-template-columns: 1fr; }
  .req dt { border-bottom: 0; padding-bottom: 4px; }
  .req dd { padding-top: 4px; background: var(--bg); }
}