:root {
  --bg: #ffffff;
  --bg-alt: #f5f7fb;
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --accent: #1d4ed8;
  --accent-hover: #1e40af;
  --card: #ffffff;
  --radius: 10px;
  --max: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --bg-alt: #111a2e;
    --text: #e6ecf5;
    --muted: #9fb0c8;
    --border: #22304a;
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --card: #131e34;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

h1, h2, h3 { line-height: 1.2; margin: 0 0 0.5em; }
h1 { font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.25rem); font-weight: 700; letter-spacing: -0.01em; }
h3 { font-size: 1.15rem; font-weight: 600; }
p { margin: 0 0 1em; }

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

/* 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-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
}
.brand-mark {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: var(--accent);
  display: inline-block;
}
.nav { display: flex; align-items: center; gap: 24px; }
.nav a { color: var(--muted); font-weight: 500; }
.nav a:hover { color: var(--text); }

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: var(--radius);
  background: var(--accent);
  color: #fff !important;
  font-weight: 600;
  border: 1px solid var(--accent);
  cursor: pointer;
  font-size: 1rem;
  font-family: inherit;
}
.btn:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-small { padding: 8px 16px; font-size: 0.95rem; }
.btn-ghost {
  background: transparent;
  color: var(--text) !important;
  border-color: var(--border);
}
.btn-ghost:hover { background: var(--bg-alt); border-color: var(--border); }

/* Hero */
.hero { padding: 96px 0 80px; }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
}
.hero h1 { max-width: 760px; }
.accent { color: var(--accent); }
.lead { font-size: 1.2rem; color: var(--muted); max-width: 640px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }

/* Sections */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); }
.section-intro { color: var(--muted); font-size: 1.1rem; margin-bottom: 36px; max-width: 640px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.card p { color: var(--muted); margin: 0; font-size: 0.98rem; }

/* Stack */
.stack-groups {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
}
.tags {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.tags li {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.9rem;
  color: var(--text);
}

/* About */
.about {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: start;
}
.about p { color: var(--muted); }
.facts {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}
.facts li {
  display: flex;
  flex-direction: column;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
}
.facts strong { font-size: 1.05rem; }
.facts span { color: var(--muted); font-size: 0.92rem; }

/* Contact */
.contact {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-line { margin: 0 0 6px; color: var(--muted); }
.contact-line a { font-weight: 600; }
.form { display: grid; gap: 16px; }
.form label {
  display: grid;
  gap: 6px;
  font-weight: 500;
  font-size: 0.95rem;
}
.form input,
.form textarea {
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
  width: 100%;
}
.form input:focus,
.form textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}
.form .btn { justify-self: start; }
.hidden { display: none; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  color: var(--muted);
  font-size: 0.92rem;
}
.footer-row { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* Responsive */
@media (max-width: 760px) {
  .nav { gap: 16px; }
  .nav a:not(.btn) { display: none; }
  .hero { padding: 64px 0 56px; }
  .section { padding: 56px 0; }
  .about, .contact { grid-template-columns: 1fr; gap: 32px; }
}