/* BitGate site.
 *
 * Deliberately a sibling of the BitLogin design system, not a twin: the same
 * ink/paper/brass foundation, with verdigris — the patina brass takes as it
 * ages — where BitLogin uses its violet seal. Same hardware, different
 * oxidation.
 */

:root {
  --ink: #0b100f;
  --ink-soft: #131a19;
  --ink-softer: #1b2422;
  --paper: #f1ece0;
  --paper-dim: #e2dac7;
  --gate: #3fc9a4;
  --gate-deep: #1f9b7d;
  --brass: #d1a85a;
  --brass-soft: #9c824f;
  --fg: #f2f1ea;
  --muted: #9aa8a3;
  --line: rgba(242, 241, 234, 0.11);
  --line-strong: rgba(242, 241, 234, 0.2);
  --code-bg: #0d1413;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  --font-display: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, monospace;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --ink: #f5f1e6;
    --ink-soft: #ffffff;
    --ink-softer: #ece5d6;
    --paper: #ffffff;
    --paper-dim: #ece5d6;
    --gate: #128a6d;
    --gate-deep: #0d6d55;
    --brass: #97762c;
    --brass-soft: #b3924a;
    --fg: #16211f;
    --muted: #5c6b66;
    --line: rgba(22, 33, 31, 0.12);
    --line-strong: rgba(22, 33, 31, 0.22);
    --code-bg: #16211f;
    color-scheme: light;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background:
    radial-gradient(1100px 620px at 82% -10%, color-mix(in srgb, var(--gate) 14%, transparent), transparent 60%),
    radial-gradient(900px 500px at -10% 15%, color-mix(in srgb, var(--brass) 10%, transparent), transparent 55%),
    var(--ink);
  color: var(--fg);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--gate); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- nav ---------- */
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1120px;
  margin: 0 auto;
  padding: 22px 24px;
  gap: 16px;
  flex-wrap: wrap;
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--fg); }
.brand:hover { text-decoration: none; }
.brand .mark { width: 30px; height: 30px; flex: none; }
.brand .wordmark {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.nav .links { display: flex; gap: 6px; flex-wrap: wrap; }
.nav .links a {
  color: var(--muted);
  padding: 7px 12px;
  border-radius: 9px;
  font-size: 14px;
  font-weight: 500;
}
.nav .links a:hover { color: var(--fg); background: var(--ink-soft); text-decoration: none; }
.nav .links a.active { color: var(--fg); background: var(--ink-soft); }

/* ---------- hero ---------- */
.hero { padding: 56px 24px 24px; }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  gap: 56px;
  align-items: center;
  max-width: 1120px;
  margin: 0 auto;
}
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brass);
  margin-bottom: 18px;
}
.eyebrow::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--brass);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brass) 25%, transparent);
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(38px, 5.4vw, 68px);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.02;
  margin: 0 0 22px;
  color: var(--fg);
}
.hero h1 em { font-style: italic; color: var(--gate); }
.hero p.lead {
  color: var(--muted);
  font-size: 17.5px;
  max-width: 500px;
  margin: 0 0 30px;
}
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 24px;
  border-radius: 11px;
  font-weight: 600;
  font-size: 14.5px;
  border: 1px solid var(--line-strong);
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
}
.btn.primary {
  background: linear-gradient(160deg, var(--gate), var(--gate-deep));
  color: #04120e;
  border: none;
  box-shadow: 0 12px 28px color-mix(in srgb, var(--gate) 32%, transparent);
}
.btn.primary:hover { transform: translateY(-1px); text-decoration: none; }
.btn.secondary { color: var(--fg); }
.btn.secondary:hover { background: var(--ink-soft); text-decoration: none; transform: translateY(-1px); }

/* ---------- signature visual: one snapshot, four verdicts ----------
 * The product's whole argument in one picture: the same item reaching four
 * surfaces and getting four different answers. A single "hidden" boolean
 * cannot draw this.
 */
.gate-scene {
  position: relative;
  display: grid;
  gap: 14px;
  justify-items: stretch;
}
.item-card {
  background: linear-gradient(165deg, var(--ink-softer), var(--ink-soft));
  border: 1px solid color-mix(in srgb, var(--brass) 40%, var(--line));
  border-radius: 16px;
  padding: 16px 18px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 10px;
}
.item-top { display: flex; align-items: center; gap: 12px; }
.item-thumb {
  width: 42px; height: 42px;
  border-radius: 10px;
  flex: none;
  background: linear-gradient(150deg, var(--gate), var(--gate-deep));
  display: grid;
  place-items: center;
}
.item-thumb svg { width: 22px; height: 22px; }
.item-label { font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted); }
.item-name { font-family: var(--font-display); font-size: 16px; font-weight: 600; }
.item-evidence {
  font-size: 12.5px;
  color: var(--muted);
  border-top: 1px dashed var(--line);
  padding-top: 9px;
}
.item-evidence b { color: var(--brass); font-weight: 600; }

.verdict-rail { display: grid; gap: 8px; }
.verdict-row {
  display: grid;
  grid-template-columns: 20px 1fr auto;
  align-items: center;
  gap: 11px;
  padding: 11px 14px;
  background: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 13.5px;
  animation: rise 0.5s ease both;
  animation-delay: calc(var(--row-order, 0) * 90ms);
}
@media (prefers-reduced-motion: reduce) {
  .verdict-row { animation: none; }
}
@keyframes rise {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}
.verdict-icon { color: var(--muted); display: grid; place-items: center; }
.verdict-icon svg { width: 16px; height: 16px; }
.verdict-surface { color: var(--fg); }
.verdict-surface small { display: block; color: var(--muted); font-size: 11.5px; }
.verdict-stamp {
  font-family: var(--font-mono);
  font-size: 11.5px;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  white-space: nowrap;
}
.verdict-stamp.pass { color: var(--gate); border-color: color-mix(in srgb, var(--gate) 45%, transparent); }
.verdict-stamp.soft { color: var(--brass); border-color: color-mix(in srgb, var(--brass) 45%, transparent); }
.verdict-stamp.hard { color: #f08a7a; border-color: color-mix(in srgb, #f08a7a 45%, transparent); }
.scene-caption { color: var(--muted); font-size: 12.5px; text-align: center; }

/* ---------- layout ---------- */
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.container.narrow { max-width: 760px; }
section { padding: 20px 0 40px; }
h2 {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
}
p.section-sub { color: var(--muted); margin: 0 0 28px; max-width: 660px; }

/* ---------- dimension table ---------- */
.ladder { display: grid; gap: 10px; margin: 30px 0; }
.ladder-row {
  display: grid;
  grid-template-columns: minmax(120px, 160px) 1fr;
  gap: 18px;
  align-items: baseline;
  background: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 18px;
}
@media (max-width: 640px) {
  .ladder-row { grid-template-columns: 1fr; gap: 6px; }
}
.ladder-row .dim {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--brass);
}
.ladder-row .steps { font-size: 13.5px; color: var(--muted); font-family: var(--font-mono); }
.ladder-row .steps b { color: var(--fg); font-weight: 600; }

/* ---------- feature grid ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
  margin: 40px 0;
}
.feature {
  background: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.feature:hover { border-color: var(--line-strong); transform: translateY(-2px); }
.feature h3 { margin: 0 0 8px; font-size: 15.5px; font-family: var(--font-display); font-weight: 600; }
.feature p { margin: 0; color: var(--muted); font-size: 13.5px; }

/* ---------- pairing with bitlogin ---------- */
.pair {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 18px;
  align-items: center;
  margin: 32px 0;
}
@media (max-width: 760px) {
  .pair { grid-template-columns: 1fr; }
  .pair .pair-join { justify-self: center; }
}
.pair-card {
  background: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
}
.pair-card .pair-kicker {
  font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.07em;
  color: var(--muted); display: block; margin-bottom: 6px;
}
.pair-card h3 { margin: 0 0 6px; font-family: var(--font-display); font-size: 17px; font-weight: 600; }
.pair-card p { margin: 0; color: var(--muted); font-size: 13.5px; }
.pair-card.is-gate {
  border-color: color-mix(in srgb, var(--brass) 55%, var(--line));
  background: linear-gradient(165deg, color-mix(in srgb, var(--gate) 14%, var(--ink-soft)), var(--ink-soft));
}
.pair-card.is-gate .pair-kicker { color: var(--brass); }
.pair-join { color: var(--brass); font-size: 22px; text-align: center; }

/* ---------- code ---------- */
pre {
  background: var(--code-bg);
  color: #e9f1ee;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.55;
}
code { font-family: var(--font-mono); }
:not(pre) > code {
  background: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 5px;
  font-size: 0.92em;
}

/* ---------- steps and callouts ---------- */
.step-list { counter-reset: step; list-style: none; padding: 0; margin: 0; }
.step-list > li {
  counter-increment: step;
  position: relative;
  padding: 0 0 28px 44px;
  border-left: 2px solid var(--line);
  margin-left: 15px;
}
.step-list > li:last-child { border-left-color: transparent; padding-bottom: 0; }
.step-list > li::before {
  content: counter(step);
  position: absolute;
  left: -15px;
  top: 0;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: linear-gradient(155deg, var(--gate), var(--gate-deep));
  color: #04120e;
  font-weight: 700;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.step-list h3 { margin: 2px 0 8px; font-size: 16px; font-family: var(--font-display); font-weight: 600; }
.step-list p { color: var(--muted); font-size: 14px; }

.callout {
  border: 1px solid var(--line);
  background: var(--ink-soft);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 13.5px;
  color: var(--muted);
  margin: 18px 0;
}
.callout strong { color: var(--fg); }
.callout.warn { border-color: color-mix(in srgb, var(--brass) 45%, var(--line)); }

/* ---------- demo sandbox ---------- */
.sandbox {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
  gap: 28px;
  align-items: start;
  margin: 30px 0 10px;
}
@media (max-width: 900px) {
  .sandbox { grid-template-columns: 1fr; }
}
.panel {
  background: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
}
.panel h3 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
}
.panel .panel-sub { color: var(--muted); font-size: 12.5px; margin: 0 0 16px; }
.control-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.control-row button {
  font: inherit;
  font-size: 13px;
  color: var(--fg);
  background: var(--ink-softer);
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  padding: 8px 13px;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.1s ease;
}
.control-row button:hover { border-color: var(--brass); transform: translateY(-1px); }
.control-row button.reset { color: var(--muted); }

.demo-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  background: var(--ink-softer);
  max-width: 320px;
}
.demo-card .art {
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, color-mix(in srgb, var(--gate) 35%, var(--ink-softer)), var(--ink-soft));
  display: grid;
  place-items: center;
  color: var(--fg);
  font-family: var(--font-display);
  font-size: 19px;
}
.demo-card .meta { padding: 12px 14px; font-size: 13.5px; }
.demo-card .meta .price { color: var(--muted); font-size: 12.5px; }

.surface-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.surface-table th, .surface-table td {
  text-align: left;
  padding: 8px 6px;
  border-bottom: 1px solid var(--line);
}
.surface-table th { color: var(--muted); font-weight: 500; font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.06em; }
.surface-table td code { font-size: 12px; }
.surface-table tr:last-child td { border-bottom: none; }

.verdict {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
}
.verdict.allow { color: var(--gate); border-color: color-mix(in srgb, var(--gate) 45%, transparent); }
.verdict.warn, .verdict.restrict, .verdict.require-review, .verdict.require-explicit-action, .verdict.downrank {
  color: var(--brass);
  border-color: color-mix(in srgb, var(--brass) 45%, transparent);
}
.verdict.hide, .verdict.deny { color: #f08a7a; border-color: color-mix(in srgb, #f08a7a 45%, transparent); }

.reason-list { margin: 10px 0 0; padding-left: 18px; color: var(--muted); font-size: 12.5px; }

/* ---------- footer ---------- */
footer {
  border-top: 1px solid var(--line);
  padding: 28px 24px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  margin-top: 40px;
}
footer .footer-links { margin-top: 8px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }