/* RisePIR landing page — risepir.org
   Static, self-contained stylesheet. No external fonts, no CDN. */

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

:root {
  /* ---- Light palette (default) ---- */
  --bg: #fbfbfa;
  --surface: #f2f1ee;
  --surface-2: #e8e6e1;
  --border: #d8d5cd;
  --text: #1b1c1e;            /* ~16.5:1 on --bg */
  --text-secondary: #4d4f53;  /* ~7.9:1 on --bg  */
  --accent: #164e63;          /* ~8.8:1 on --bg  */

  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "Roboto Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --content-width: 52rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101214;
    --surface: #17191c;
    --surface-2: #1f2226;
    --border: #2b2e33;
    --text: #e8e9ea;           /* ~15.4:1 on --bg */
    --text-secondary: #b7bac0; /* ~9.6:1 on --bg  */
    --accent: #7fd0e0;         /* ~10.7:1 on --bg */
  }
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.2;
  margin: 0;
}

h1 { font-size: clamp(2rem, 1.55rem + 2vw, 3rem); }
h2 { font-size: clamp(1.4rem, 1.2rem + 1vw, 1.9rem); }
h3 { font-size: clamp(1.1rem, 1rem + 0.4vw, 1.3rem); }

p {
  margin: 0 0 1rem;
  max-width: 42rem;
}

p:last-child {
  margin-bottom: 0;
}

ul {
  margin: 1rem 0 0;
  padding-left: 1.25rem;
  max-width: 42rem;
}

li {
  margin-bottom: 0.75rem;
}

li:last-child {
  margin-bottom: 0;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

code {
  font-family: var(--font-mono);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration-thickness: 2px;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

@media (prefers-reduced-motion: no-preference) {
  a, .stat, nav a {
    transition: color 120ms ease, border-color 120ms ease;
  }
}

.wrap {
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}

/* ---- Skip link ---- */

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--bg);
  padding: 0.75rem 1.25rem;
  z-index: 100;
  border-radius: 0 0 6px 0;
  font-family: var(--font-sans);
  text-decoration: none;
}

.skip-link:focus {
  left: 0;
}

/* ---- Header ---- */

.site-header {
  border-bottom: 1px solid var(--border);
  padding-block: clamp(2.25rem, 6vw, 4rem) 1.75rem;
}

.eyebrow {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin: 0 0 0.85rem;
  max-width: none;
}

.site-header h1 {
  margin-bottom: 0.6rem;
}

.tagline {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 38rem;
}

.site-header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.4rem;
  margin-top: 1.75rem;
  font-size: 0.92rem;
}

.site-header nav a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-block: 0.2rem;
}

.site-header nav a:hover {
  border-bottom-color: currentColor;
}

/* ---- Sections ---- */

main {
  display: block;
}

main > section {
  padding-block: clamp(2.5rem, 6vw, 4rem);
}

main > section + section {
  border-top: 1px solid var(--border);
}

.sec-label {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 0.6rem;
}

section h2 {
  margin-bottom: 1.25rem;
}

section h3 {
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

section h3:first-of-type {
  margin-top: 1.75rem;
}

.lede {
  font-size: 1.05rem;
}

/* ---- Stats grid ---- */

dl.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin: 1.75rem 0 0.75rem;
  max-width: none;
}

dl.stats > div {
  background: var(--bg);
  padding: 1rem 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

dl.stats dt {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

dl.stats dd {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--text);
  margin: 0;
  line-height: 1.4;
}

.note {
  font-size: 0.88rem;
  color: var(--text-secondary);
  max-width: 42rem;
  margin-top: 1rem;
}

/* Citation block: the paper is the point of this page, so it is set apart
   from body prose by a rule rather than by weight or colour. */
.cite {
  max-width: 42rem;
  margin: 0;
  padding-left: 1rem;
  border-left: 2px solid var(--accent);
  line-height: 1.6;
}

.cite cite {
  font-style: normal;
  font-weight: 600;
  color: var(--text);
}

/* ---- Diagram ---- */

.diagram-figure {
  margin: 2rem 0;
  max-width: none;
}

.diagram-figure .diagram-wrap {
  max-width: 380px;
  margin-inline: auto;
}

.diagram-figure svg {
  width: 100%;
  height: auto;
  display: block;
}

.diagram-figure figcaption {
  margin-top: 1.25rem;
  font-size: 0.92rem;
  color: var(--text-secondary);
  max-width: 40rem;
  margin-inline: auto;
  text-align: center;
}

/* ---- Screenshots ---- */

.shots {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin: 1.75rem 0;
  max-width: none;
}

figure.shot {
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--surface);
}

figure.shot img {
  width: 100%;
  height: auto;
  min-height: 140px;
  background: var(--surface-2);
  object-fit: cover;
}

figure.shot figcaption {
  padding: 0.75rem 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
}

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

footer {
  border-top: 1px solid var(--border);
  padding-block: 2rem;
}

footer p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  max-width: 42rem;
}

/* ---- 404 page ---- */

.error-page main {
  min-height: 60vh;
  display: flex;
  align-items: center;
}

.error-page .wrap {
  padding-block: 4rem;
}

.error-code {
  font-family: var(--font-mono);
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 0.75rem;
}