:root {
  --bg: #1C1917;
  --panel: #292524;
  --amber: #F59E0B;
  --amber-dim: #B45309;
  --ink: #F5F5F4;
  --muted: #A8A29E;
  --line: #44403C;
}

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

html {
  scroll-behavior: auto;
}

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.75;
}

svg {
  display: block;
}

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

.wrap {
  width: min(1040px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  background: #0C0A09;
  border-bottom: 3px solid var(--amber);
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-family: ui-monospace, "Cascadia Mono", "Segoe UI", monospace;
  font-size: 15px;
}

.brand svg {
  width: 26px;
  height: 26px;
  color: var(--amber);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  font-size: 13px;
  font-family: ui-monospace, "Cascadia Mono", "Segoe UI", monospace;
}

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

.nav a:hover,
.nav a:focus {
  color: #FDE68A;
  text-decoration: underline;
}

.hero {
  padding: 36px 0 8px;
}

.warn {
  background: #451A03;
  border-left: 6px solid var(--amber);
  padding: 28px 24px;
  border-radius: 2px;
}

.warn h1 {
  font-size: 26px;
  line-height: 1.35;
  margin-bottom: 12px;
}

.warn p {
  color: #FED7AA;
  margin-bottom: 8px;
  max-width: 48em;
}

.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 22px 0 10px;
}

.pill {
  border: 1px solid var(--amber);
  color: var(--amber);
  border-radius: 999px;
  padding: 5px 14px;
  font-size: 13px;
  font-family: ui-monospace, "Cascadia Mono", "Segoe UI", monospace;
}

.section {
  padding: 28px 0;
}

h2 {
  font-size: 22px;
  margin-bottom: 12px;
  color: #FDE68A;
}

p {
  margin-bottom: 12px;
  color: var(--ink);
}

.muted {
  color: var(--muted);
}

.diag {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
  border: 1px solid var(--line);
}

.diag th,
.diag td {
  border: 1px solid var(--line);
  padding: 11px 12px;
  text-align: left;
  vertical-align: top;
}

.diag th {
  background: #0C0A09;
  color: var(--amber);
  font-weight: 600;
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin: 16px 0 8px;
}

.steps li {
  list-style: none;
  border: 1px solid var(--line);
  border-right: 0;
  padding: 16px 14px;
  background: var(--panel);
  border-radius: 2px;
}

.steps li:last-child {
  border-right: 1px solid var(--line);
}

.steps .num {
  display: block;
  color: var(--amber);
  font-family: ui-monospace, "Cascadia Mono", "Segoe UI", monospace;
  font-size: 12px;
  margin-bottom: 8px;
}

.duo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.duo article {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 20px;
}

.duo article svg {
  width: 32px;
  height: 32px;
  color: var(--amber);
  margin-bottom: 10px;
}

.phone-check {
  background: #0C0A09;
  border: 1px dashed var(--amber-dim);
  padding: 22px;
  border-radius: 2px;
}

ul.plain {
  margin: 6px 0 12px 1.2em;
}

ul.plain li {
  margin-bottom: 8px;
}

.faq details {
  background: var(--panel);
  border-left: 4px solid var(--amber);
  margin-bottom: 10px;
  padding: 8px 16px 10px;
  border-radius: 2px;
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
  padding: 10px 0;
  color: #FDE68A;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.site-footer {
  background: #0C0A09;
  color: var(--muted);
  padding: 24px 0 32px;
  font-size: 13px;
  border-top: 1px solid var(--line);
}

.site-footer p {
  margin-bottom: 8px;
}

@media (max-width: 800px) {
  .header-row,
  .steps,
  .duo {
    display: block;
  }

  .steps li {
    border-right: 1px solid var(--line);
    border-bottom: 0;
  }

  .steps li:last-child {
    border-bottom: 1px solid var(--line);
  }
}