/* Color scheme */
:root {
  --bg: #0b0b0b;
  --text: #f5f5f5;
  --accent: #3fffa7;
  --muted: #b3b3b3;
  --card: #141414;
  --border: #222;
}

/* Reset / Base */
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(6px);
  background: linear-gradient(to bottom, rgba(11,11,11,0.9), rgba(11,11,11,0.6), rgba(11,11,11,0));
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.nav { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; }
.logo { display: flex; align-items: baseline; gap: 8px; font-weight: 700; letter-spacing: 0.5px; }
.logo-mark { color: var(--accent); filter: drop-shadow(0 0 12px rgba(63,255,167,0.5)); }
.logo-text { color: var(--text); opacity: 0.9; }
.site-nav { display: flex; gap: 20px; align-items: center; }
.site-nav a { color: var(--muted); font-weight: 500; transition: color .2s ease; }
.site-nav a:hover { color: var(--text); }
.site-nav .accent { color: var(--accent); }

/* Hero */
.hero {
  position: relative;
  min-height: 86vh;
  display: grid;
  align-items: center;
  padding: 80px 0 60px;
}
.title {
  font-size: clamp(42px, 6vw, 86px);
  line-height: 1.05;
  margin: 0 0 18px;
  letter-spacing: -0.02em;
}
.subtitle {
  color: var(--muted);
  font-size: clamp(16px, 1.8vw, 20px);
  max-width: 72ch;
  margin: 0 0 28px;
}
.cta-group { display: flex; gap: 14px; flex-wrap: wrap; }

/* Accent background pattern */
.accent-grid {
  position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(ellipse at 20% 10%, rgba(63,255,167,0.12), transparent 40%),
              radial-gradient(ellipse at 80% 30%, rgba(63,255,167,0.10), transparent 40%),
              radial-gradient(ellipse at 50% 90%, rgba(63,255,167,0.08), transparent 40%);
}

/* Sections */
.section { padding: 80px 0; }
.section.alt { background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent 20%); }
.two-col { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 28px; }
.two-col .card { margin-bottom: 18px; }
.center { text-align: center; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; align-items: stretch; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  padding: 18px;
  border-radius: 12px;
  box-shadow: 0 0 0 1px rgba(255,255,255,0.02) inset;
}
.card h3 { margin-top: 6px; margin-bottom: 8px; }
.card p { color: var(--muted); }
.link { color: var(--accent); font-weight: 600; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  height: 44px;
  padding: 0 18px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #111;
  color: var(--text);
  font-weight: 600;
  transition: transform .06s ease, background .2s ease, border-color .2s ease;
}
.btn:hover { transform: translateY(-1px); border-color: #2a2a2a; }
.btn:active { transform: translateY(0); }
.btn-accent { background: var(--accent); color: #0b0b0b; border-color: transparent; }
.btn-accent:hover { filter: drop-shadow(0 0 16px rgba(63,255,167,0.35)); }
.btn-ghost { background: transparent; }

/* Subscribe form */
.subscribe-form { display: inline-flex; gap: 10px; align-items: center; }
.subscribe-form input {
  height: 44px; padding: 0 14px; width: min(420px, 80vw);
  border-radius: 10px; border: 1px solid var(--border); background: #111; color: var(--text);
}
.subscribe-form input::placeholder { color: #8a8a8a; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 24px 0 40px; color: var(--muted); }

/* Reveal on scroll */
.reveal-up { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal-up.is-visible { opacity: 1; transform: translateY(0); }
.delay-1 { transition-delay: .12s; }
.delay-2 { transition-delay: .24s; }

/* Responsive */
@media (max-width: 900px) {
  .two-col { grid-template-columns: 1fr; }
  .cards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .site-nav { display: none; }
  .cards { grid-template-columns: 1fr; }
}