/* Dark is the default theme; [data-theme="light"] switches to light. */
:root {
  --bg: #0b1018;
  --bg-alt: #111826;
  --surface: #151e2e;
  --border: #243044;
  --text: #e6ebf2;
  --text-muted: #9aa7b8;
  --accent: #3fb6a8;
  --accent-strong: #5fd0c2;
  --accent-ink: #06201d;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.25);
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #f7f9fc;
  --bg-alt: #edf1f7;
  --surface: #ffffff;
  --border: #d8dfe9;
  --text: #121a26;
  --text-muted: #556274;
  --accent: #127a6f;
  --accent-strong: #0e6157;
  --accent-ink: #ffffff;
  --shadow: 0 1px 2px rgba(16,24,40,.06), 0 8px 24px rgba(16,24,40,.06);
  color-scheme: light;
}

* { 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, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  transition: background-color .2s, color .2s;
}
a { color: var(--accent); }
a:hover { color: var(--accent-strong); }
h1, h2, h3 { line-height: 1.2; letter-spacing: -.01em; margin: 0 0 .6em; }
h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); max-width: 18ch; }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.2rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 720px; }
.center { text-align: center; }
.dim { color: var(--text-muted); }

/* Header */
.site-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);
}
.nav { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 1.15rem; }
.brand svg { color: var(--accent); }
nav { display: flex; align-items: center; gap: 22px; }
nav a { color: var(--text-muted); text-decoration: none; font-size: .95rem; }
nav a:hover { color: var(--text); }

.theme-toggle {
  display: inline-grid; place-items: center;
  width: 38px; height: 38px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  cursor: pointer;
}
.theme-toggle:hover { border-color: var(--accent); }
.theme-toggle:focus-visible, .btn:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.icon-moon { display: none; }
:root[data-theme="light"] .icon-sun { display: none; }
:root[data-theme="light"] .icon-moon { display: block; }

/* Buttons */
.btn {
  display: inline-block; padding: 12px 22px; border-radius: 8px;
  background: var(--accent); color: var(--accent-ink) !important;
  font-weight: 600; text-decoration: none; border: 1px solid var(--accent);
}
.btn:hover { background: var(--accent-strong); border-color: var(--accent-strong); }
.btn-ghost { background: transparent; color: var(--text) !important; border-color: var(--border); }
.btn-ghost:hover { background: var(--surface); border-color: var(--accent); }
.btn-small { padding: 7px 14px; font-size: .9rem; }

/* Hero */
.hero {
  padding: 96px 0 88px;
  background:
    radial-gradient(900px 400px at 85% -10%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 70%),
    var(--bg);
  border-bottom: 1px solid var(--border);
}
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .8rem; font-weight: 600; color: var(--accent); }
.lead { font-size: 1.2rem; color: var(--text-muted); max-width: 60ch; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

/* Sections */
.section { padding: 80px 0; }
.section.alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); margin-top: 28px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 26px; box-shadow: var(--shadow);
}
.card p:last-child { margin-bottom: 0; }
.card.accent { border-color: var(--accent); }

.split { display: grid; gap: 40px; grid-template-columns: 1.3fr 1fr; align-items: start; margin-top: 12px; }
.sources { font-size: .85rem; color: var(--text-muted); }

.steps { list-style: none; counter-reset: s; margin: 0; padding: 0; }
.steps li {
  counter-increment: s; position: relative; padding: 0 0 18px 48px; color: var(--text-muted);
}
.steps li strong { color: var(--text); }
.steps li::before {
  content: counter(s); position: absolute; left: 0; top: 0;
  width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center;
  background: var(--surface); border: 1px solid var(--accent); color: var(--accent); font-weight: 700; font-size: .9rem;
}

.tiers-title { margin-top: 56px; font-size: 1.4rem; }
.tier-name { font-weight: 700; font-size: 1.2rem; margin-bottom: 2px; }
.tier-for { color: var(--text-muted); font-size: .92rem; }
.tier ul { margin: 0; padding-left: 1.1em; }
.tier li { margin-bottom: 6px; }
.tier.featured { border-color: var(--accent); position: relative; }
.tier.featured::after {
  content: "Most popular"; position: absolute; top: -12px; right: 18px;
  background: var(--accent); color: var(--accent-ink); font-size: .75rem; font-weight: 700;
  padding: 3px 10px; border-radius: 999px;
}
.note { margin-top: 24px; color: var(--text-muted); font-size: .95rem; }

/* Footer */
.site-footer { padding: 32px 0; border-top: 1px solid var(--border); font-size: .9rem; }
.site-footer p { margin: 0 0 4px; }

@media (max-width: 760px) {
  nav a:not(.btn) { display: none; }
  nav { gap: 10px; }
  .split { grid-template-columns: 1fr; }
  .hero { padding: 64px 0 56px; }
  .section { padding: 56px 0; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  body { transition: none; }
}