/* Sift site. Static, offline, no build step. Dark theme and brand gradient
   mirror the product. */

:root {
  --bg: #0f1218;
  --bg-alt: #14181f;
  --bg-card: #1a1f28;
  --bg-sunken: #10141a;
  --border: #2a313c;
  --text: #e4e8ee;
  --dim: #9aa4b2;
  --faint: #6b7480;
  --accent: #5b9dff;
  --accent-strong: #2563eb;
  --ok: #4ade80;
  --warn: #fbbf24;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --maxw: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* Header / nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(15, 18, 24, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav .wrap {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 60px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}
.brand:hover { text-decoration: none; }
.brand .mark {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  display: inline-block;
}
.nav nav { margin-left: auto; display: flex; gap: 22px; }
.nav nav a { color: var(--dim); font-size: 14px; }
.nav nav a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero {
  background:
    radial-gradient(1200px 400px at 80% -10%, rgba(91, 157, 255, 0.18), transparent),
    linear-gradient(135deg, #16203a 0%, #0f1218 60%);
  border-bottom: 1px solid var(--border);
  padding: 72px 0 64px;
}
.hero h1 { font-size: 56px; line-height: 1.05; margin: 0 0 16px; letter-spacing: -0.02em; }
.hero .tagline { font-size: 21px; color: var(--text); max-width: 620px; margin: 0 0 12px; }
.hero .sub { font-size: 16px; color: var(--dim); max-width: 620px; margin: 0 0 28px; }
.cta { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 11px 20px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--bg-card);
}
.btn:hover { text-decoration: none; border-color: var(--accent); }
.btn.primary {
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  border-color: transparent;
  color: #fff;
}

.preview {
  margin-top: 44px;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
}
.preview img { display: block; width: 100%; height: auto; }

/* Sections */
section { padding: 56px 0; border-bottom: 1px solid var(--border); }
section h2 { font-size: 28px; margin: 0 0 8px; letter-spacing: -0.01em; }
section .lead { color: var(--dim); margin: 0 0 28px; max-width: 680px; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}
.card h3 { margin: 0 0 6px; font-size: 16px; }
.card p { margin: 0; color: var(--dim); font-size: 14px; }
.card .tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  background: var(--bg-sunken);
  border-radius: 4px;
  padding: 1px 7px;
  margin-bottom: 10px;
}

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 760px) {
  .two-col { grid-template-columns: 1fr; }
  .hero h1 { font-size: 42px; }
}

.privacy-band { background: var(--bg-alt); }
.privacy-band ul { margin: 0; padding-left: 0; list-style: none; display: grid; gap: 12px; }
.privacy-band li { padding-left: 26px; position: relative; color: var(--dim); }
.privacy-band li strong { color: var(--text); }
.privacy-band li::before {
  content: "";
  position: absolute;
  left: 0; top: 9px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--ok);
}

/* Code + docs */
pre, code { font-family: var(--mono); }
pre {
  background: var(--bg-sunken);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.55;
}
code { background: var(--bg-sunken); padding: 1px 6px; border-radius: 4px; font-size: 13px; }
pre code { background: none; padding: 0; }

.doc { padding: 48px 0 64px; }
.doc h1 { font-size: 36px; margin: 0 0 8px; }
.doc h2 { font-size: 24px; margin: 40px 0 10px; padding-top: 8px; }
.doc h3 { font-size: 17px; margin: 24px 0 6px; }
.doc p, .doc li { color: var(--dim); }
.doc strong { color: var(--text); }
.doc table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px; }
.doc th, .doc td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
.doc th { color: var(--text); font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; }
.doc td { color: var(--dim); }
.toc {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
  margin: 20px 0 8px;
}
.toc h2 { margin: 0 0 8px; font-size: 13px; text-transform: uppercase; letter-spacing: 0.04em; color: var(--dim); padding: 0; }
.toc ul { margin: 0; padding-left: 18px; columns: 2; }
.toc a { font-size: 14px; }
.note {
  border-left: 3px solid var(--accent);
  background: var(--bg-alt);
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  margin: 16px 0;
  color: var(--dim);
  font-size: 14px;
}
.legal p, .legal li { color: var(--dim); }
.legal .updated { color: var(--faint); font-size: 13px; }

/* Footer */
.footer { padding: 40px 0; color: var(--faint); font-size: 13px; }
.footer .wrap { display: flex; flex-wrap: wrap; gap: 16px 28px; align-items: center; }
.footer nav { display: flex; gap: 18px; }
.footer nav a { color: var(--dim); }
.footer .disclaimer { width: 100%; color: var(--faint); margin-top: 6px; }