:root {
  color-scheme: dark;
  --bg-void: #0B0F12;
  --bg-panel: #12181C;
  --bg-raised: #182126;
  --signal-primary: #3EE6C4;
  --signal-dim: #1E6B5C;
  --text-primary: #EAF6F2;
  --text-secondary: #9FB4AD;
  --text-faint: #5A6B66;
  --stroke-hairline: #22303A;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --radius-card: 20px;
  --radius-control: 14px;
  --radius-stamp: 8px;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  background: var(--bg-void);
}

body {
  margin: 0;
  padding: var(--space-3) var(--space-5) var(--space-8);
  background: var(--bg-void);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", sans-serif;
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

[data-lang] {
  display: none;
}

[data-lang].is-active {
  display: block;
}

.document {
  width: 100%;
  max-width: 520px;
  margin: 0 auto;
}

.hero {
  padding: var(--space-4) 0 var(--space-6);
  border-bottom: 1px solid var(--stroke-hairline);
}

.signal-state {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
  color: var(--signal-primary);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2.2px;
  text-transform: uppercase;
}

.signal-dot {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--signal-primary);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: var(--space-3);
  font-size: 30px;
  line-height: 1.16;
  letter-spacing: -0.5px;
}

.lede {
  margin-bottom: var(--space-3);
  color: var(--text-secondary);
  font-size: 16px;
  line-height: 1.62;
}

.updated {
  margin-bottom: 0;
  color: var(--text-faint);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 11px;
  letter-spacing: 1.1px;
  text-transform: uppercase;
}

.readout {
  margin: var(--space-5) 0;
  padding: var(--space-4);
  background: var(--bg-raised);
  border: 1px solid var(--stroke-hairline);
  border-radius: var(--radius-card);
}

.readout-label,
.section-label,
.fact-label,
.step-index {
  color: var(--signal-primary);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 1.8px;
  text-transform: uppercase;
}

.readout strong {
  display: block;
  margin-top: var(--space-2);
  color: var(--text-primary);
  font-size: 18px;
  line-height: 1.4;
}

.facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  margin: var(--space-5) 0;
}

.fact {
  min-width: 0;
  padding: var(--space-3);
  background: var(--bg-panel);
  border: 1px solid var(--stroke-hairline);
  border-radius: var(--radius-control);
}

.fact-value {
  display: block;
  margin-top: var(--space-1);
  color: var(--text-primary);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.35;
}

.section {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--stroke-hairline);
}

.section h2 {
  margin: var(--space-2) 0 var(--space-3);
  color: var(--text-primary);
  font-size: 20px;
  line-height: 1.3;
}

.section h3 {
  margin: var(--space-4) 0 var(--space-2);
  color: var(--text-primary);
  font-size: 16px;
  line-height: 1.4;
}

.section p,
.section li {
  color: var(--text-secondary);
}

.section p:last-child,
.section ul:last-child,
.section ol:last-child {
  margin-bottom: 0;
}

ul,
ol {
  margin: 0;
  padding-left: var(--space-5);
}

li + li {
  margin-top: var(--space-2);
}

.steps {
  margin: var(--space-5) 0;
  padding: 0;
  list-style: none;
  counter-reset: field-step;
}

.steps li {
  position: relative;
  margin: 0;
  padding: var(--space-4) 0 var(--space-4) 44px;
  border-bottom: 1px solid var(--stroke-hairline);
  counter-increment: field-step;
}

.steps li::before {
  content: counter(field-step, decimal-leading-zero);
  position: absolute;
  top: var(--space-4);
  left: 0;
  color: var(--signal-primary);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
}

.steps strong {
  display: block;
  margin-bottom: var(--space-1);
  color: var(--text-primary);
}

.steps span {
  color: var(--text-secondary);
}

.faq {
  margin: var(--space-5) 0;
}

details {
  background: var(--bg-panel);
  border: 1px solid var(--stroke-hairline);
  border-radius: var(--radius-control);
}

details + details {
  margin-top: var(--space-2);
}

summary {
  min-height: 48px;
  padding: var(--space-3) 42px var(--space-3) var(--space-4);
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.45;
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

summary::after {
  content: "+";
  position: absolute;
  right: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--signal-primary);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 20px;
  font-weight: 400;
}

details[open] summary::after {
  content: "−";
}

details p {
  margin: 0;
  padding: 0 var(--space-4) var(--space-4);
  color: var(--text-secondary);
}

a {
  color: var(--signal-primary);
  text-underline-offset: 3px;
}

.action-link {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--signal-dim);
  border-radius: var(--radius-control);
  color: var(--signal-primary);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1px;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
}

.footer-note {
  margin: var(--space-6) 0 0;
  padding: var(--space-4);
  border-left: 2px solid var(--signal-dim);
  color: var(--text-faint);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 11px;
  line-height: 1.65;
}

.contact-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 52px;
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background: var(--bg-panel);
  border: 1px solid var(--stroke-hairline);
  border-radius: var(--radius-control);
  color: var(--text-faint);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 11px;
  letter-spacing: 1px;
}

.contact-card a {
  color: var(--signal-primary);
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

@media (max-width: 380px) {
  body {
    padding-right: var(--space-4);
    padding-left: var(--space-4);
  }

  .facts {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}