:root {
  --bg: #0b0f14;
  --bg-2: #11161d;
  --surface: #161d27;
  --border: #1f2933;
  --text: #e8eef5;
  --muted: #9aa6b2;
  --brand: #4f8cff;
  --brand-2: #7c5cff;
  --accent: #00d4a6;
  --danger: #ff5c7a;
  --radius: 14px;
  --max: 1120px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", Roboto, sans-serif;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ── Nav ─────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(11, 15, 20, 0.7);
  border-bottom: 1px solid var(--border);
}
.nav .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.logo { display: flex; align-items: center; gap: 10px; }
.logo-mark {
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-2) 100%);
  border-radius: 10px;
  display: grid; place-items: center;
  font-weight: 900; color: white;
}
.logo-text { font-weight: 800; letter-spacing: 0.5px; }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { color: var(--muted); font-size: 15px; }
.nav-links a:hover { color: var(--text); }
.nav-links .btn { color: white; }

/* ── Buttons ─────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px;
  border-radius: 12px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform .12s ease, box-shadow .12s ease;
  cursor: pointer;
}
.btn:hover { transform: translateY(-1px); }
.btn-lg { padding: 14px 22px; font-size: 16px; }
.btn-primary {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-2) 100%);
  color: white;
  box-shadow: 0 8px 24px rgba(79, 140, 255, 0.25);
}
.btn-outline { border-color: var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--brand); }

/* ── Hero ────────────────────────────────────────────── */
.hero { padding: 80px 0 100px; text-align: center; }
.hero h1 {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 900;
  letter-spacing: -1px;
  margin: 0 0 20px;
  line-height: 1.1;
}
.gradient {
  background: linear-gradient(135deg, var(--brand) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lead {
  max-width: 640px; margin: 0 auto 40px;
  font-size: 19px; color: var(--muted);
}
.cta-row {
  display: flex; gap: 16px; justify-content: center; flex-wrap: wrap;
}
.hero-note { color: var(--muted); margin-top: 18px; font-size: 14px; }

/* ── Sections ────────────────────────────────────────── */
section h2 {
  text-align: center;
  font-size: clamp(28px, 4vw, 42px);
  margin: 0 0 48px;
  font-weight: 800;
}
.features { padding: 80px 0; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color .15s ease, transform .15s ease;
}
.card:hover { border-color: var(--brand); transform: translateY(-3px); }
.card .icon { font-size: 32px; margin-bottom: 14px; }
.card h3 { margin: 0 0 10px; font-size: 19px; }
.card p { color: var(--muted); margin: 0; font-size: 15px; }
.card a { color: var(--brand); font-weight: 600; }

/* ── Security ────────────────────────────────────────── */
.security { padding: 80px 0; background: var(--bg-2); }
.security-list {
  max-width: 720px; margin: 0 auto; padding: 0; list-style: none;
}
.security-list li {
  padding: 16px 20px;
  border-left: 3px solid var(--brand);
  background: var(--surface);
  border-radius: 0 12px 12px 0;
  margin-bottom: 12px;
  color: var(--muted);
}
.security-list strong { color: var(--text); margin-right: 6px; }

/* ── Download ────────────────────────────────────────── */
.download { padding: 80px 0; text-align: center; }
.download-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  max-width: 720px; margin: 0 auto;
}
.dl-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 16px;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  transition: border-color .15s ease;
}
.dl-card:not(.disabled):hover { border-color: var(--brand); }
.dl-card.disabled { opacity: 0.5; cursor: not-allowed; }
.dl-card strong { font-size: 18px; }
.dl-card small { color: var(--muted); font-size: 13px; }

/* ── Footer ──────────────────────────────────────────── */
footer { padding: 60px 0 30px; border-top: 1px solid var(--border); }
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 30px;
  margin-bottom: 30px;
}
.footer-grid strong { display: block; margin-bottom: 12px; }
.footer-grid a { display: block; color: var(--muted); padding: 4px 0; font-size: 14px; }
.footer-grid a:hover { color: var(--text); }
.footer-grid p { color: var(--muted); font-size: 14px; margin: 0; }
footer hr { border: none; border-top: 1px solid var(--border); margin: 20px 0; }
.copyright { text-align: center; color: var(--muted); font-size: 13px; margin: 0; }