/* otpmock — shared styles.
   Art direction: an airport arrivals hall. Split-flap boards, signage yellow,
   warm paper. Geist for type, Geist Mono for codes, labels and the board. */

:root {
  --paper: #f3f0e7;
  --paper-2: #ebe7dc;
  --card: #faf8f2;
  --ink: #141412;
  --ink-2: #46443e;
  --ink-3: #807c73;
  --rule: #d9d4c7;
  --signal: #ffc400;
  --on-signal: #141412;
  --go: #1d7a45;
  --stop: #b42318;
  --add-bg: rgba(29, 122, 69, 0.10);
  --tag-bg: #141412; /* signage badges: dark in both themes */

  /* The board is always dark, in both themes. */
  --board: #121211;
  --flap: #1f1f1d;
  --flap-hi: #282826;
  --flap-ink: #f3eee2;
  --flap-dim: #8b877d;
  --flap-go: #64d69a;
  --board-rule: #2c2b28;

  --display: "Geist Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --sans: "Geist Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --track-tight: -0.04em;

  --wrap: 1180px;
  --gutter: clamp(16px, 4vw, 40px);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0e0e0c;
    --paper-2: #151513;
    --card: #181816;
    --ink: #efebe1;
    --ink-2: #b9b4a7;
    --ink-3: #7d796f;
    --rule: #2a2926;
    --go: #64d69a;
    --stop: #ff7d6e;
    --add-bg: rgba(100, 214, 154, 0.10);
    --tag-bg: #2a2924;
    --board: #171715;
    --flap: #232321;
    --flap-hi: #2b2b28;
    --board-rule: #34332f;
    color-scheme: dark;
  }
}

/* ---------- Base ---------- */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 24px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 16.5px/1.6 var(--sans);
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
::selection { background: var(--signal); color: var(--on-signal); }
a { color: inherit; text-decoration-color: color-mix(in srgb, currentColor 35%, transparent); text-underline-offset: 0.18em; }
a:hover { text-decoration-color: currentColor; }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; border-radius: 2px; }
img, svg { display: block; max-width: 100%; }
code, kbd, pre { font-family: var(--mono); font-size: 0.9em; }
:not(pre) > code {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 0.05em 0.35em;
  font-size: 0.85em;
  overflow-wrap: anywhere;
}
h1, h2, h3, h4 { margin: 0; font-weight: 400; }
p { margin: 0; }

.wrap { max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }
.mono { font-family: var(--mono); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- Buttons & links ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border-radius: 4px;
  background: var(--signal);
  color: var(--on-signal);
  font: 600 16px/1 var(--sans);
  text-decoration: none;
  border: 0;
  cursor: pointer;
  box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.14);
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
}
.btn:hover { background: #ffcd1f; }
.btn:active { transform: translateY(1px); box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.14); }
.btn-sm { padding: 10px 14px; font-size: 14px; }
.btn-ink { background: var(--ink); color: var(--paper); box-shadow: none; }
.btn-ink:hover { background: var(--ink-2); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  text-decoration: none;
  padding: 14px 4px;
}
.link-arrow::after { content: "→"; transition: transform 0.15s ease; }
.link-arrow:hover::after { transform: translateX(4px); }

/* ---------- Nav ---------- */

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 22px;
}
.logo { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; }
.logo-flaps { display: inline-flex; gap: 2px; }
.logo-flaps i {
  position: relative;
  display: grid;
  place-items: center;
  width: 19px;
  height: 26px;
  border-radius: 3px;
  background: linear-gradient(var(--flap-hi) 50%, var(--flap) 50%);
  color: var(--flap-ink);
  font: 600 15px/1 var(--mono);
  font-style: normal;
}
.logo-flaps i::after {
  content: "";
  position: absolute;
  inset: 50% 0 auto;
  height: 1px;
  background: rgba(0, 0, 0, 0.7);
}
.logo-word { font: 600 21px/1 var(--display); letter-spacing: -0.03em; }
.nav-links { display: flex; align-items: center; gap: clamp(14px, 2.4vw, 28px); font-size: 15px; }
.nav-links a:not(.btn) { text-decoration: none; color: var(--ink-2); }
.nav-links a:not(.btn):hover { color: var(--ink); }
@media (max-width: 640px) { .nav-links .hide-sm { display: none; } }
@media (max-width: 420px) { .nav-links a:not(.btn):not(.keep) { display: none; } .nav-links .btn { padding-inline: 10px; } }

/* ---------- Signage section labels ---------- */

.sign {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font: 500 13px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.sign b {
  display: inline-grid;
  place-items: center;
  min-width: 24px;
  height: 24px;
  padding-inline: 6px;
  border-radius: 3px;
  background: var(--tag-bg);
  color: var(--signal);
  font-weight: 600;
  letter-spacing: 0;
}

/* ---------- Split-flap ---------- */

/* One cell. JS builds: .f > .h.t, .h.b (static) + .h.t.lf, .h.b.lf (moving leaves). */
.f {
  --cw: 20px;
  --ch: calc(var(--cw) * 1.42);
  position: relative;
  display: inline-block;
  flex: none;
  width: var(--cw);
  height: var(--ch);
  perspective: calc(var(--ch) * 6);
  color: var(--flap-ink);
  font: 600 calc(var(--cw) * 0.98) / var(--ch) var(--mono);
  text-align: center;
  text-transform: uppercase;
}
.f .h {
  position: absolute;
  left: 0;
  right: 0;
  height: 50%;
  overflow: hidden;
  background: var(--flap);
  backface-visibility: hidden;
}
.f .h b { display: block; height: var(--ch); font-weight: inherit; }
.f .t { top: 0; border-radius: 3px 3px 0 0; background: linear-gradient(var(--flap-hi), var(--flap)); }
.f .b { bottom: 0; border-radius: 0 0 3px 3px; }
.f .b b { transform: translateY(-50%); }
.f .lf { visibility: hidden; z-index: 2; }
.f .t.lf { transform-origin: 50% 100%; }
.f .b.lf { transform-origin: 50% 0; transform: rotateX(90deg); }
.f::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: calc(50% - 0.5px);
  height: 1px;
  background: rgba(0, 0, 0, 0.75);
  z-index: 3;
}
.f.y { color: var(--signal); }
.f.g { color: var(--flap-go); }
.flaps { display: inline-flex; gap: 2px; }

/* Small inline flap words (status chips in copy). */
.flapword { display: inline-flex; gap: 2px; vertical-align: middle; }
.flapword .f { --cw: 15px; }

/* ---------- Code blocks ---------- */

.codeblock {
  position: relative;
  background: var(--board);
  color: var(--flap-ink);
  border: 1px solid var(--board-rule);
  border-radius: 10px;
  overflow: hidden;
}
.codeblock-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px 10px 18px;
  border-bottom: 1px solid var(--board-rule);
  font: 500 12.5px/1 var(--mono);
  color: var(--flap-dim);
}
.codeblock pre {
  margin: 0;
  padding: 18px 20px 20px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.7;
  tab-size: 2;
}
.codeblock pre code { font-size: inherit; }
.copy {
  appearance: none;
  border: 1px solid var(--board-rule);
  background: transparent;
  color: var(--flap-dim);
  font: 500 12px/1 var(--mono);
  padding: 6px 9px;
  border-radius: 4px;
  cursor: pointer;
}
.copy:hover { color: var(--flap-ink); border-color: var(--flap-dim); }
.codeblock .tk-c { color: #7f7b71; }
.codeblock .tk-s { color: #b7e4a8; }
.codeblock .tk-k { color: #ffd257; }
.codeblock .tk-f { color: #9fc8ff; }
.codeblock .tk-n { color: #f5a97f; }
.codeblock .add { display: inline-block; min-width: calc(100% + 40px); background: rgba(100, 214, 154, 0.12); box-shadow: inset 3px 0 0 #64d69a; margin-inline: -20px; padding-inline: 20px; }
.codeblock .add::before { content: "+ "; color: #64d69a; }

/* ---------- Footer ---------- */

.foot { margin-top: clamp(56px, 8vw, 96px); border-top: 1px solid var(--rule); padding-top: 48px; overflow: hidden; }
.foot-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }
@media (max-width: 640px) { .foot-grid { grid-template-columns: 1fr 1fr; } }
.foot-col { display: flex; flex-direction: column; gap: 10px; font-size: 15px; }
.foot-col h4 { font: 500 12px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 6px; }
.foot-col a { text-decoration: none; color: var(--ink-2); }
.foot-col a:hover { color: var(--ink); }
.foot-col span { color: var(--ink-3); font-size: 14px; }
.foot-mark {
  font: 700 clamp(80px, 19vw, 260px) / 0.8 var(--display);
  letter-spacing: -0.065em;
  margin: 56px 0 0 -0.04em;
  white-space: nowrap;
  color: var(--ink);
  user-select: none;
}
.foot-base {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px 24px;
  padding-block: 22px 28px;
  border-top: 1px solid var(--rule);
  margin-top: 18px;
  font: 400 13px/1.5 var(--mono);
  color: var(--ink-3);
}

/* ---------- Prose pages (docs, legal) ---------- */

.page-head { padding-block: clamp(32px, 6vw, 72px) clamp(24px, 4vw, 40px); border-bottom: 1px solid var(--rule); }
.page-head h1 { font: 600 clamp(44px, 6.4vw, 80px) / 1 var(--display); letter-spacing: var(--track-tight); margin-top: 18px; }
.page-head p { margin-top: 16px; color: var(--ink-2); max-width: 40em; font-size: 18px; }

.prose { max-width: 720px; }
.prose h2 { font: 600 clamp(26px, 3vw, 32px) / 1.15 var(--display); letter-spacing: -0.03em; margin: 56px 0 14px; scroll-margin-top: 24px; }
.prose h3 { font: 600 18px/1.35 var(--sans); margin: 32px 0 8px; scroll-margin-top: 24px; }
.prose p, .prose ul, .prose ol { margin: 0 0 16px; color: var(--ink-2); }
.prose ul, .prose ol { padding-left: 1.25em; }
.prose li { margin-bottom: 6px; }
.prose li::marker { color: var(--ink-3); }
.prose strong { color: var(--ink); font-weight: 600; }
.prose .codeblock { margin: 18px 0 24px; }
.prose table { width: 100%; border-collapse: collapse; margin: 16px 0 24px; font-size: 15px; }
.prose th, .prose td { text-align: left; padding: 10px 12px 10px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.prose th { font: 500 12px/1.4 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3); }
.prose td { color: var(--ink-2); }
.table-scroll { overflow-x: auto; }
.callout {
  border-left: 3px solid var(--signal);
  background: var(--paper-2);
  padding: 14px 18px;
  border-radius: 0 6px 6px 0;
  margin: 0 0 20px;
  color: var(--ink-2);
  font-size: 16px;
}
.updated { font: 400 13px/1 var(--mono); color: var(--ink-3); }

/* ---------- Guides ---------- */

.guide-meta { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-top: 18px; font: 400 13px/1.4 var(--mono); color: var(--ink-3); }
.crumbs { font: 400 13px/1.4 var(--mono); color: var(--ink-3); margin-top: 6px; }
.crumbs a { color: var(--ink-3); }
.tldr { margin: 28px 0 8px; padding: 18px 20px; border-radius: 10px; background: var(--card); border: 1px solid var(--rule); border-left: 3px solid var(--signal); }
.tldr strong { display: block; font: 500 12px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 8px; }
.tldr p { margin: 0 !important; color: var(--ink) !important; }
.prose details { border-bottom: 1px solid var(--rule); padding: 14px 0; }
.prose details summary { cursor: pointer; font-weight: 600; color: var(--ink); }
.prose details p { margin: 10px 0 0; }
.related { list-style: none; padding: 0 !important; display: grid; gap: 10px; }
.related a { display: block; padding: 14px 16px; border: 1px solid var(--rule); border-radius: 8px; text-decoration: none; background: var(--card); color: var(--ink); font-weight: 500; }
.related a:hover { border-color: var(--ink-3); }
.related a span { display: block; margin-top: 4px; font-weight: 400; font-size: 14px; color: var(--ink-3); }
.guide-cta { margin: 40px 0 0; padding: 24px; border-radius: 12px; background: var(--board); color: var(--flap-ink); }
.guide-cta p { color: var(--flap-dim) !important; margin: 8px 0 16px !important; }
.guide-cta b { font: 600 22px/1.2 var(--display); letter-spacing: -0.03em; color: var(--flap-ink); }
.guide-list { display: grid; gap: 14px; padding-top: 32px; max-width: 820px; }

/* ---------- Providers grid (home, /providers/) ---------- */
.providers { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
@media (max-width: 960px) { .providers { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 480px) { .providers { grid-template-columns: 1fr; } }
.providers li { display: flex; }
.providers a { display: flex; flex-direction: column; gap: 6px; width: 100%; padding: 18px; border: 1px solid var(--rule); border-radius: 12px; background: var(--card); text-decoration: none; color: var(--ink); transition: border-color 0.15s; }
.providers a:hover { border-color: var(--ink); }
.providers b { font: 600 20px/1.1 var(--display); letter-spacing: -0.03em; }
.providers span { font-size: 14px; color: var(--ink-2); }
.providers code { margin-top: auto; padding: 10px 0 0 !important; font-size: 12px !important; color: var(--ink-3); background: none !important; border: 0 !important; }