:root {
  color-scheme: dark;
  --bg: #04070f;
  --panel: rgba(9, 13, 22, 0.80);
  --panel-strong: rgba(14, 20, 33, 0.94);
  --border: rgba(143, 160, 188, 0.18);
  --text: #edf3ff;
  --muted: #aebad4;
  --accent: #6ee7ff;
  --accent-2: #86f4c5;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #1d3358;
  --panel: rgba(232, 236, 242, 0.92);
  --panel-strong: rgba(240, 244, 248, 0.98);
  --border: rgba(148, 163, 184, 0.35);
  --text: #0f172a;
  --muted: #334155;
  --accent: #0ea5e9;
  --accent-2: #34d399;
  --shadow: 0 18px 36px rgba(15, 23, 42, 0.18);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top, rgba(110, 231, 255, 0.10), transparent 22%),
    radial-gradient(circle at 80% 10%, rgba(134, 244, 197, 0.08), transparent 18%),
    linear-gradient(180deg, var(--bg) 0%, color-mix(in srgb, var(--bg) 88%, #111827 12%) 100%);
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(135deg, transparent 0 30%, rgba(255,255,255,0.035) 30% 32%, transparent 32% 60%, rgba(255,255,255,0.032) 60% 62%, transparent 62%),
    radial-gradient(circle at 50% 50%, rgba(110, 231, 255, 0.03), transparent 35%);
  pointer-events: none;
  opacity: 0.9;
}

.site-shell { position: relative; z-index: 1; width: min(1200px, calc(100vw - 2rem)); margin: 0 auto; padding-bottom: 3rem; }
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  backdrop-filter: blur(14px);
  box-shadow: var(--shadow);
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

body.scrolled .topbar { transform: translateY(4px); border-color: color-mix(in srgb, var(--border) 70%, transparent); }

.brand, .nav-links a, .button { text-decoration: none; }
.brand {
  display: inline-flex; align-items: center; gap: 0.75rem;
  color: var(--text); font-weight: 700; letter-spacing: -0.02em;
}
.brand-mark { height: 42px; width: auto; border-radius: 12px; background: rgba(255,255,255,0.04); padding: 4px; }
.nav-links { display: flex; gap: 1.1rem; align-items: center; }
.nav-links a { color: var(--muted); font-weight: 500; transition: color 150ms ease; }
.nav-links a:hover { color: var(--text); }

.theme-toggle {
  display: inline-flex; align-items: center; gap: 0.6rem;
  border: 1px solid var(--border); border-radius: 999px;
  padding: 0.5rem 0.75rem; background: var(--panel-strong); color: var(--text); cursor: pointer; box-shadow: var(--shadow);
}
.theme-icon { font-size: 1rem; }

main { display: grid; gap: 1.2rem; padding-top: 1.1rem; }
.card, .panel {
  border: 1px solid var(--border); border-radius: 28px;
  background: var(--panel); box-shadow: var(--shadow); backdrop-filter: blur(16px);
}
.hero { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 1.15rem; padding: 1rem; }
.hero-copy, .hero-panel { padding: 1rem; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.22em; font-size: 0.78rem; color: var(--accent); margin-bottom: 0.4rem; }
h1, h2 { margin: 0 0 0.65rem; letter-spacing: -0.03em; line-height: 1.02; }
h1 { font-size: clamp(2.4rem, 7vw, 4.4rem); }
h2 { font-size: clamp(1.35rem, 4vw, 1.9rem); }
.lede, .panel p, .contact-card p { color: var(--muted); line-height: 1.6; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1rem; }
.button { display: inline-flex; align-items: center; justify-content: center; padding: 0.75rem 1rem; border-radius: 999px; font-weight: 600; border: 1px solid transparent; transition: transform 150ms ease, opacity 150ms ease; }
.button:hover { transform: translateY(-1px); }
.button.primary { color: #03111d; background: linear-gradient(135deg, var(--accent), var(--accent-2)); }
.button.secondary { color: var(--text); border-color: var(--border); background: rgba(255,255,255,0.04); }
.feature-list { display: grid; gap: 0.45rem; padding-left: 1rem; color: var(--muted); margin-top: 1rem; }
.hero-panel { display: grid; gap: 1rem; align-content: center; }
.hero-logo { width: 100%; max-width: 320px; justify-self: center; border-radius: 24px; background: rgba(255,255,255,0.04); padding: 0.75rem; border: 1px solid var(--border); }
.mini-card { padding: 0.9rem; border-radius: 18px; border: 1px solid var(--border); background: linear-gradient(145deg, color-mix(in srgb, var(--panel-strong) 85%, transparent), rgba(255,255,255,0.03)); }
.mini-card p { margin: 0 0 0.35rem; color: var(--accent); text-transform: uppercase; font-size: 0.78rem; letter-spacing: 0.18em; }
.mini-card strong { display: block; font-size: 1.05rem; margin-bottom: 0.2rem; }
.mini-card span { color: var(--muted); font-size: 0.95rem; }
.grid.two-up { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.panel { padding: 1rem; }
.contact-card { padding: 1rem; }

@keyframes card-highlight {
  0%   { background: var(--panel); box-shadow: var(--shadow); }
  25%  { background: color-mix(in srgb, var(--accent) 18%, var(--panel));
         box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 55%, transparent), var(--shadow); }
  100% { background: var(--panel); box-shadow: var(--shadow); }
}

.card.highlight { animation: card-highlight 2s ease-out; }

#about, #launch, #contact { scroll-margin-top: 6rem; }

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
  padding: 1rem 0.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}
.site-footer p { margin: 0; }
.site-footer nav { display: flex; gap: 1.25rem; }
.site-footer nav a { color: var(--muted); text-decoration: none; transition: color 150ms ease; }
.site-footer nav a:hover { color: var(--text); }

@media (max-width: 980px) { .hero, .grid.two-up { grid-template-columns: 1fr; } }
@media (max-width: 760px) {
  .topbar { flex-wrap: wrap; border-radius: 24px; }
  .nav-links { width: 100%; justify-content: space-between; order: 3; }
  .theme-label { display: none; }
}