/* railvo.app: direction D (Ledger Rail) tokens from docs/architecture/07-frontend-and-design.md.
   Ink and paper carry the interface; teal appears only where it means "the path money takes". */

@font-face {
  font-family: "Instrument Sans";
  font-style: normal;
  font-display: swap;
  font-weight: 400 700;
  src: url(/fonts/instrument-sans-5.3.0-latin-ext.woff2) format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329,
    U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: "Instrument Sans";
  font-style: normal;
  font-display: swap;
  font-weight: 400 700;
  src: url(/fonts/instrument-sans-5.3.0-latin.woff2) format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329,
    U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  --bg: #f6f6f4;
  --surface: #ffffff;
  --ink: #17181b;
  --ink-2: #3a3d42;
  --muted: #61656c;
  --line: #e4e4e1;
  --line-2: #cfd0cc;
  --route: #0b7d73;
  --focus: #3b6cf6;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121315;
    --surface: #1a1b1e;
    --ink: #ecece8;
    --ink-2: #c9cac5;
    --muted: #9a9da3;
    --line: #2a2c30;
    --line-2: #44474d;
    --route: #3fb8aa;
    --focus: #7c9cff;
    color-scheme: dark;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 1rem/1.6 "Instrument Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration-color: var(--line-2);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-color: currentColor;
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
  border-radius: 2px;
}

.wrap {
  max-width: 44rem;
  margin: 0 auto;
  padding-left: max(20px, env(safe-area-inset-left, 0px));
  padding-right: max(20px, env(safe-area-inset-right, 0px));
}

/* Header and footer */

.top {
  border-bottom: 1px solid var(--line);
}

.top .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.1rem;
}

.mark {
  font-weight: 650;
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.top nav {
  display: flex;
  gap: 1.25rem;
  font-size: 0.9375rem;
  color: var(--ink-2);
}

.top nav a {
  text-decoration: none;
}

.top nav a:hover,
.top nav a[aria-current="page"] {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--line-2);
}

.foot {
  border-top: 1px solid var(--line);
  margin-top: 4rem;
  color: var(--muted);
  font-size: 0.875rem;
}

.foot .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 1.5rem 2.5rem;
}

.foot p {
  margin: 0;
}

.foot nav {
  display: flex;
  gap: 1.25rem;
}

/* Home */

.hero {
  padding-block: 4.5rem 1rem;
}

.hero h1 {
  margin: 0 0 1.25rem;
  font-size: clamp(2rem, 1.4rem + 2.6vw, 2.75rem);
  line-height: 1.12;
  letter-spacing: -0.022em;
  font-weight: 650;
  text-wrap: balance;
  max-width: 17em;
}

.lede {
  margin: 0;
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--ink-2);
  max-width: 38em;
}

.route {
  margin: 2.75rem 0 0;
  padding: 1.5rem 1.25rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.route svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 26rem;
}

.route figcaption {
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--muted);
}

.node {
  fill: var(--surface);
  stroke: var(--line-2);
  stroke-width: 1;
}

.node-text {
  fill: var(--ink);
  font: 600 14px "Instrument Sans", ui-sans-serif, system-ui, sans-serif;
}

.node-sub {
  fill: var(--muted);
  font: 400 12px "Instrument Sans", ui-sans-serif, system-ui, sans-serif;
}

.money {
  stroke: var(--route);
  stroke-width: 2;
  fill: none;
}

.money-head {
  fill: var(--route);
}

.reads {
  stroke: var(--ink-2);
  stroke-width: 1.25;
  stroke-dasharray: 2 4;
  stroke-linecap: round;
  fill: none;
}

.edge-label {
  fill: var(--ink-2);
  font: 400 12px "Instrument Sans", ui-sans-serif, system-ui, sans-serif;
}

.status {
  margin: 2.5rem 0 0;
  padding-left: 0.875rem;
  border-left: 2px solid var(--line-2);
  color: var(--ink-2);
}

/* Legal pages */

.doc {
  padding-block: 3.5rem 0;
}

.doc h1 {
  margin: 0;
  font-size: 2rem;
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 650;
}

.doc .updated {
  margin: 0.5rem 0 2.25rem;
  color: var(--muted);
  font-size: 0.9375rem;
}

.doc h2 {
  margin: 2.5rem 0 0.75rem;
  font-size: 1.125rem;
  line-height: 1.35;
  font-weight: 650;
  text-wrap: balance;
}

.doc p,
.doc li {
  color: var(--ink-2);
  max-width: 40em;
}

.doc p {
  margin: 0 0 1rem;
}

.doc ul {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
}

.doc li {
  margin-bottom: 0.4rem;
}

.doc li::marker {
  color: var(--muted);
}

.doc strong {
  color: var(--ink);
  font-weight: 600;
}

.doc code {
  font: 0.875em ui-monospace, "SFMono-Regular", Menlo, monospace;
  color: var(--ink);
}

.intro {
  font-size: 1.0625rem;
}

@media (max-width: 30rem) {
  .hero {
    padding-block: 3rem 0.5rem;
  }
  .route {
    padding: 1rem 0.75rem 0.875rem;
  }
  .top nav,
  .foot nav {
    gap: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
  }
}