:root {
  --bg: #000000;
  --surface: #0d0d0d;
  --border: #1f1f1f;
  --text: #f5f5f5;
  --muted: #a3a3a3;
  --accent: #4ade80;
  --accent-hover: #86efac;
  --max-width: 1100px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 600;
  white-space: nowrap;
}

.brand-mark {
  width: 28px;
  height: 28px;
  filter: drop-shadow(0 0 8px rgba(74, 222, 128, 0.45));
}

.brand-accent { color: var(--accent); }

.nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.nav a:hover { color: var(--text); }

.nav-cta {
  color: var(--text);
  border: 1px solid var(--border);
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
}

.nav-cta:hover { border-color: var(--accent); }

/* Hero */
.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 7rem 1.5rem 5rem;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 6vw, 4.25rem);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.02em;
  max-width: 16ch;
  margin: 0 auto 1.5rem;
}

.lead {
  color: var(--muted);
  font-size: 1.15rem;
  max-width: 60ch;
  margin: 0 auto 2.5rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  border-radius: 999px;
  font-weight: 500;
  border: 1px solid transparent;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn-primary {
  background: var(--accent);
  color: #000;
}

.btn-primary:hover { background: var(--accent-hover); }

.btn-ghost {
  border-color: var(--border);
  color: var(--text);
}

.btn-ghost:hover { border-color: var(--accent); }

/* Sections */
.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4rem 1.5rem;
  border-top: 1px solid var(--border);
}

.section-narrow { max-width: 760px; }

.section h2 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 1.5rem;
}

.section p { color: var(--muted); font-size: 1.05rem; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.75rem;
  transition: border-color 0.15s ease;
}

.card:hover { border-color: var(--accent); }

.card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.card p { font-size: 0.98rem; }

.contact { text-align: center; }
.contact p { margin-bottom: 1.75rem; }

/* Footer */
.footer-mark { opacity: 0.8; }

.site-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.875rem;
}

/* Mobile */
@media (max-width: 600px) {
  .nav { gap: 1rem; font-size: 0.9rem; }
  .nav a:not(.nav-cta) { display: none; }
  .hero { padding: 5rem 1rem 3.5rem; }
  .section { padding: 3rem 1rem; }
}

/* Contact form */
.contact-form {
  max-width: 520px;
  margin: 0 auto;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-row { display: flex; flex-direction: column; gap: 0.4rem; }

.form-row label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text);
}

.optional { color: var(--muted); font-weight: 400; }

.form-row input,
.form-row textarea {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem 0.9rem;
  color: var(--text);
  font: inherit;
  font-size: 0.98rem;
  transition: border-color 0.15s ease;
}

.form-row textarea { resize: vertical; }

.form-row input::placeholder,
.form-row textarea::placeholder { color: #666; }

.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.15);
}

.contact-form .btn { align-self: center; margin-top: 0.5rem; cursor: pointer; }

.form-note {
  text-align: center;
  font-size: 0.875rem;
  margin: 0.25rem 0 0;
}

.form-note a { color: var(--accent); }
.form-note a:hover { color: var(--accent-hover); }