:root {
  --bg: #f7f8fb;
  --surface: #ffffff;
  --text: #1a1f2e;
  --muted: #5b6478;
  --line: #e2e6ef;
  --accent: #3d63e6;
  --accent-text: #ffffff;
  --accent-soft: #e8eeff;
  --warn-soft: #fff5e6;
  --warn-line: #f0c27a;
  --radius: 14px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1320;
    --surface: #171c2c;
    --text: #e8ebf3;
    --muted: #9aa3b8;
    --line: #2a3146;
    --accent: #7d9bff;
    --accent-text: #0f1320;
    --accent-soft: #1d2645;
    --warn-soft: #2a2215;
    --warn-line: #7a5a26;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a { color: var(--accent); }

h1, h2, h3 { line-height: 1.2; margin: 0 0 .6em; }
h1 { font-size: clamp(2rem, 5vw, 3rem); letter-spacing: -.02em; }
h2 { font-size: clamp(1.5rem, 3.5vw, 2rem); letter-spacing: -.01em; }
h3 { font-size: 1.1rem; }
p { margin: 0 0 1em; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 720px; }
main.narrow { margin: 15vh auto; padding: 0 20px; }

section { padding: 72px 0; }
section + section { border-top: 1px solid var(--line); }

.muted, .sub { color: var(--muted); }
.sub { margin-top: -.4em; margin-bottom: 1.6em; }

/* header */
.top {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.top-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.15rem; color: var(--text); text-decoration: none; }

/* buttons */
.button {
  display: inline-block;
  background: var(--accent); color: var(--accent-text);
  border: 0; border-radius: 10px;
  padding: 12px 22px;
  font: inherit; font-weight: 600;
  text-decoration: none; cursor: pointer;
}
.button:hover { filter: brightness(1.08); }
.button.small { padding: 7px 14px; font-size: .9rem; }
.link { margin-left: 14px; font-weight: 600; }
.note { font-size: .9rem; }

/* hero */
.hero { padding-top: 64px; }
.hero-inner { display: grid; grid-template-columns: 1fr 1.1fr; gap: 48px; align-items: center; }
.eyebrow { color: var(--accent); font-weight: 600; font-size: .9rem; text-transform: uppercase; letter-spacing: .06em; }
.lead { font-size: 1.15rem; color: var(--muted); }
.hero-img { width: 100%; height: auto; }
.ticks { list-style: none; padding: 0; margin: 0 0 1.4em; }
.ticks li { position: relative; padding-left: 1.7em; margin-bottom: .35em; }
.ticks li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }

/* steps */
.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.steps li { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.num {
  display: inline-grid; place-items: center;
  width: 34px; height: 34px; margin-bottom: 12px;
  border-radius: 50%; background: var(--accent-soft); color: var(--accent); font-weight: 700;
}

/* security cards */
.cards { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.cards li { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.cards p { color: var(--muted); margin: 0; }

/* limits */
.limits .narrow { background: var(--warn-soft); border: 1px solid var(--warn-line); border-radius: var(--radius); padding: 32px; }
.limits ul { margin: 0; padding-left: 1.2em; }
.limits li + li { margin-top: .6em; }

/* faq */
details { border-bottom: 1px solid var(--line); padding: 14px 0; }
summary { cursor: pointer; font-weight: 600; }
details p { margin: .6em 0 0; color: var(--muted); }

/* form */
.join { background: var(--accent-soft); }
.form { display: grid; gap: 8px; max-width: 480px; }
.form label { font-weight: 600; margin-top: 10px; }
.form input[type=email], .form select {
  font: inherit; padding: 11px 13px;
  border: 1px solid var(--line); border-radius: 10px;
  background: var(--surface); color: var(--text);
}
.form input:focus, .form select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.form .check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; font-size: .95rem; }
.form .check input { margin-top: 5px; }
.form .button { margin-top: 14px; justify-self: start; }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

/* footer */
.foot { border-top: 1px solid var(--line); padding: 28px 0; color: var(--muted); font-size: .9rem; }
.foot-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* legal pages */
.legal h2 { font-size: 1.2rem; margin-top: 1.8em; }
.todo { background: var(--warn-soft); border: 1px dashed var(--warn-line); padding: 0 .3em; border-radius: 4px; }

@media (max-width: 860px) {
  .hero-inner, .steps, .cards { grid-template-columns: 1fr; }
  .hero-img { max-width: 420px; }
  section { padding: 52px 0; }
}