:root {
  --bg: #0b0c10;
  --card: #111218;
  --text: #e9eef5;
  --muted: #a7b0c0;
  --primary: #5b8cff;
  --primary-600: #3e6ff0;
  --accent: linear-gradient(135deg, #5b8cff 0%, #8f66ff 100%);
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 800px at 80% -10%, rgba(91,140,255,.15), transparent 60%),
              radial-gradient(900px 600px at -10% 10%, rgba(143,102,255,.12), transparent 50%),
              var(--bg);
  line-height: 1.6;
}

.container {
  width: min(1100px, calc(100% - 2rem));
  margin: 0 auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(140%) blur(8px);
  background: rgba(11,12,16,.6);
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .9rem 0;
}
.brand { display: inline-flex; align-items: center; gap: .6rem; font-weight: 600; }
.brand-mark {
  display: grid; place-items: center;
  width: 34px; height: 34px; border-radius: 9px;
  background: var(--accent);
  color: #fff; font-weight: 700;
  box-shadow: var(--shadow);
}
.brand-name { letter-spacing: .2px; }

.site-nav ul { display: flex; gap: 1rem; list-style: none; padding: 0; margin: 0; }
.site-nav a { color: var(--text); text-decoration: none; padding: .5rem .7rem; border-radius: .5rem; }
.site-nav a:hover { background: rgba(255,255,255,.06); }
.nav-toggle { display: none; background: transparent; border: 1px solid rgba(255,255,255,.2); color: var(--text); padding: .4rem .6rem; border-radius: .5rem; }

/* Hero */
.hero { padding: 6rem 0 4rem; text-align: center; }
.hero-inner { max-width: 900px; }
.hero h1 { margin: 0 0 1rem; font-size: clamp(1.6rem, 2.6vw + 1rem, 2.6rem); line-height: 1.2; }
.subtitle { color: var(--muted); margin: 0 auto 2rem; max-width: 800px; }
.hero-cta { display: flex; gap: .8rem; justify-content: center; flex-wrap: wrap; }

.btn { display: inline-block; padding: .9rem 1.1rem; border-radius: .8rem; text-decoration: none; font-weight: 600; border: 1px solid rgba(255,255,255,.1); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: var(--shadow); }
.btn-ghost { color: var(--text); background: transparent; }
.btn-ghost:hover { background: rgba(255,255,255,.06); }

/* Sections */
.section { padding: 4rem 0; }
.section.alt { background: linear-gradient(180deg, rgba(255,255,255,.03), transparent 30%); }
.section h2 { margin: 0 0 1rem; font-size: 1.6rem; }
.section-intro { color: var(--muted); margin-bottom: 2rem; }

.two-col { display: grid; grid-template-columns: 1.2fr .8fr; gap: 1.6rem; align-items: start; }
.grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }

.card {
  background: var(--card);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: var(--radius);
  padding: 1.1rem;
  box-shadow: 0 4px 18px rgba(0,0,0,.25);
}
.card h3 { margin: 0 0 .4rem; font-size: 1.1rem; }
.card p { color: var(--muted); margin: 0; }
.card.highlight { border-color: rgba(91,140,255,.35); box-shadow: 0 6px 26px rgba(91,140,255,.15); }

.checklist { margin: .8rem 0 0; padding: 0; list-style: none; }
.checklist li { position: relative; padding-left: 1.6rem; margin: .4rem 0; }
.checklist li::before {
  content: "✔"; position: absolute; left: 0; top: 0; color: #77d28f; opacity: .9;
}

/* Steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.step { background: var(--card); border: 1px solid rgba(255,255,255,.06); border-radius: var(--radius); padding: 1rem; }
.step-num { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--accent); color: #fff; font-weight: 700; margin-bottom: .5rem; }

/* Accordion */
.accordion .item { background: var(--card); border: 1px solid rgba(255,255,255,.06); border-radius: var(--radius); padding: .6rem .9rem; margin-bottom: .6rem; }
.accordion summary { cursor: pointer; list-style: none; font-weight: 600; }
.accordion summary::-webkit-details-marker { display: none; }
.accordion .content { color: var(--muted); padding-top: .4rem; }

/* Footer */
.site-footer { border-top: 1px solid rgba(255,255,255,.06); background: rgba(0,0,0,.25); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; padding: 1.4rem 0; gap: 1rem; flex-wrap: wrap; }
.brand-footer .brand-mark { width: 28px; height: 28px; border-radius: 8px; }
.legal { color: var(--muted); }

/* Responsive */
@media (max-width: 920px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .two-col { grid-template-columns: 1fr; }
}
@media (max-width: 700px) {
  .site-nav { display: none; position: absolute; right: 1rem; top: 56px; background: var(--card); border: 1px solid rgba(255,255,255,.08); border-radius: .8rem; box-shadow: var(--shadow); }
  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; padding: .4rem; }
  .site-nav a { display: block; }
  .nav-toggle { display: inline-block; }
  .grid { grid-template-columns: 1fr; }
}