:root {
  --bg: #050505;
  --bg-elevated: #0a0a0a;
  --bg-card: #111111;
  --border: #262626;
  --border-hover: #404040;
  --text: #fafafa;
  --text-muted: #a3a3a3;
  --text-dim: #737373;
  --accent: #ffffff;
  --danger: #f87171;
  --success: #4ade80;
  --radius: 12px;
  --font: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.container { width: min(1120px, 92vw); margin: 0 auto; }

/* Nav */
.site-nav {
  position: sticky; top: 0; z-index: 50;
  border-bottom: 1px solid var(--border);
  background: rgba(5, 5, 5, 0.85);
  backdrop-filter: blur(12px);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 64px; gap: 1rem;
}
.logo {
  display: flex; align-items: center; gap: 0.65rem;
  font-weight: 700; letter-spacing: 0.04em;
}
.logo-mark {
  width: 36px; height: 36px; border: 1px solid var(--border);
  display: grid; place-items: center; font-family: var(--mono); font-size: 0.75rem;
}
.logo small { display: block; color: var(--text-dim); font-weight: 500; font-size: 0.7rem; }
.nav-links { display: flex; gap: 1.5rem; list-style: none; margin: 0; padding: 0; }
.nav-links a { color: var(--text-muted); font-size: 0.92rem; }
.nav-links a:hover { color: var(--text); }
.nav-actions { display: flex; gap: 0.6rem; align-items: center; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  padding: 0.6rem 1.1rem; border-radius: 8px; font-weight: 600; font-size: 0.9rem;
  border: 1px solid transparent; cursor: pointer; transition: 0.15s ease;
}
.btn-primary { background: var(--text); color: var(--bg); }
.btn-primary:hover { background: #e5e5e5; color: var(--bg); }
.btn-ghost { background: transparent; border-color: var(--border); color: var(--text); }
.btn-ghost:hover { border-color: var(--border-hover); }
.btn-block { width: 100%; }

/* Hero */
.hero { padding: 5rem 0 4rem; border-bottom: 1px solid var(--border); }
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 3rem; align-items: center; }
.eyebrow {
  font-family: var(--mono); font-size: 0.75rem; color: var(--text-dim);
  letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 1rem;
}
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); line-height: 1.08; margin: 0 0 1rem; font-weight: 800; }
.hero-lead { color: var(--text-muted); font-size: 1.05rem; max-width: 34rem; margin-bottom: 1.75rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.hero-card {
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.5rem; background: var(--bg-elevated);
}
.hero-card h3 { margin: 0 0 0.75rem; font-size: 0.85rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.08em; }
.stat-row { display: flex; justify-content: space-between; padding: 0.55rem 0; border-bottom: 1px solid var(--border); font-size: 0.92rem; }
.stat-row:last-child { border-bottom: none; }
.stat-row span:last-child { font-family: var(--mono); color: var(--text-muted); }

/* Sections */
.section { padding: 4rem 0; }
.section h2 { font-size: 1.75rem; margin: 0 0 0.5rem; }
.section-sub { color: var(--text-muted); margin: 0 0 2rem; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.feature-card {
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.25rem; background: var(--bg-elevated);
}
.feature-card h3 { margin: 0 0 0.5rem; font-size: 1rem; }
.feature-card p { margin: 0; color: var(--text-muted); font-size: 0.9rem; }

.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; counter-reset: step; }
.step {
  border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem;
  position: relative; padding-top: 2.5rem;
}
.step::before {
  counter-increment: step; content: counter(step);
  position: absolute; top: 1rem; left: 1.25rem;
  font-family: var(--mono); font-size: 0.75rem; color: var(--text-dim);
}
.step h3 { margin: 0 0 0.35rem; font-size: 0.95rem; }
.step p { margin: 0; color: var(--text-muted); font-size: 0.85rem; }

.site-footer {
  border-top: 1px solid var(--border); padding: 2rem 0;
  color: var(--text-dim); font-size: 0.85rem;
}
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }

/* Auth pages */
.auth-page {
  min-height: 100vh; display: grid; place-items: center; padding: 2rem;
  background: radial-gradient(ellipse at top, #141414 0%, var(--bg) 55%);
}
.auth-card {
  width: min(420px, 100%); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 2rem; background: var(--bg-elevated);
}
.auth-logo { font-weight: 800; font-size: 1.1rem; letter-spacing: 0.06em; display: inline-block; margin-bottom: 1.25rem; }
.auth-logo span { color: var(--text-muted); font-weight: 600; }
.auth-card h1 { margin: 0 0 0.35rem; font-size: 1.5rem; }
.auth-sub { color: var(--text-muted); font-size: 0.9rem; margin: 0 0 1.5rem; }
.auth-form label { display: block; margin-bottom: 1rem; font-size: 0.82rem; color: var(--text-muted); }
.auth-form input {
  width: 100%; margin-top: 0.35rem; padding: 0.65rem 0.75rem;
  border-radius: 8px; border: 1px solid var(--border); background: var(--bg);
  color: var(--text); font: inherit;
}
.auth-form input:focus { outline: none; border-color: var(--border-hover); }
.auth-switch { text-align: center; margin-top: 1rem; font-size: 0.88rem; color: var(--text-muted); }
.auth-error, .auth-alert {
  margin-top: 0.75rem; padding: 0.65rem 0.75rem; border-radius: 8px; font-size: 0.85rem;
}
.auth-error { color: var(--danger); border: 1px solid rgba(248,113,113,0.3); }
.auth-alert { color: var(--danger); border: 1px solid var(--border); background: #1a0a0a; }
.hidden { display: none !important; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .feature-grid, .steps { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
}
@media (max-width: 560px) {
  .feature-grid, .steps { grid-template-columns: 1fr; }
}