:root {
  --bg: #f1f4f8;
  --ink: #17222f;
  --muted: #566272;
  --line: #d6dde6;
  --paper: #ffffff;
  --navy: #1d3a5f;
  --gold: #8a6414;
  --green: #1b5c3a;
  --amber: #8a5a12;
  --max: 40rem;
}

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

html {
  color-scheme: only light;
  background: var(--bg);
  scroll-behavior: smooth;
}

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

body {
  margin: 0;
  color-scheme: only light;
  background: var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.55;
}

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

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

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

.wrap {
  max-width: var(--max);
  margin-inline: auto;
  padding: 1.25rem 0.85rem 3rem;
}

.skip {
  position: absolute;
  left: -999px;
  top: 0;
}

.skip:focus {
  left: 0.75rem;
  top: 0.75rem;
  z-index: 2;
  background: var(--paper);
  padding: 0.4rem 0.6rem;
}

.brand {
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--navy);
  font-weight: 700;
  margin: 0 0 0.35rem;
}

.checked {
  margin: 0 0 0.75rem;
  font-size: 0.95rem;
}

nav.site {
  margin: 0 0 1rem;
  font-size: 0.95rem;
}

nav.site ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav.site a {
  font-weight: 600;
  display: inline-block;
  padding: 0.35rem 0;
}

.unofficial {
  color: var(--muted);
  font-size: 0.92rem;
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 0.45rem 0.7rem;
  margin: 0 0 1.25rem;
}

.notice {
  color-scheme: only light;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 4px solid var(--amber);
  padding: 0.75rem 0.9rem;
  margin: 0 0 1.5rem;
}

.notice p {
  margin: 0;
}

.notice p + p {
  margin-top: 0.5rem;
}

h1 {
  font-family: Palatino, "Palatino Linotype", "Iowan Old Style", Georgia, serif;
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 0.75rem;
}

h2 {
  font-family: Palatino, "Palatino Linotype", "Iowan Old Style", Georgia, serif;
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.2;
  margin: 2rem 0 0.5rem;
}

h2 .src {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--muted);
  letter-spacing: 0;
}

h3 {
  font-size: 1.05rem;
  margin: 1.25rem 0 0.35rem;
}

.lead {
  font-size: 1.1rem;
  margin: 0 0 1rem;
}

p {
  margin: 0 0 0.9rem;
}

ul,
ol {
  margin: 0 0 1rem;
  padding-left: 1.4rem;
}

li {
  margin: 0.2rem 0;
}

.meta {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0.15rem 0;
}

.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  padding: 0.1rem 0.45rem;
  border-radius: 0.25rem;
  vertical-align: 0.12em;
}

.badge.verified {
  color: #ffffff;
  background: var(--green);
}

.badge.unverified {
  color: #ffffff;
  background: #9a6b12;
}

.badge.tbd {
  color: var(--ink);
  background: #e4e9f0;
  border: 1px solid var(--line);
}

.badge.example {
  color: #ffffff;
  background: #7c2d12;
}

dl.facts {
  background: var(--paper);
  border: 1px solid var(--line);
  margin: 0 0 1.5rem;
  padding: 0.25rem 0.9rem 0.6rem;
}

dl.facts div {
  display: flex;
  gap: 0.75rem;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}

dl.facts div:last-child {
  border-bottom: 0;
}

dl.facts dt {
  font-weight: 700;
  min-width: 8.5rem;
  flex: 0 0 auto;
  margin: 0;
}

dl.facts dd {
  margin: 0;
  flex: 1 1 12rem;
}

.cards {
  display: grid;
  gap: 0.75rem;
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
}

.cards a {
  display: block;
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--navy);
  padding: 0.75rem 0.9rem;
  text-decoration: none;
}

.cards a:hover,
.cards a:focus-visible {
  border-color: var(--navy);
}

.cards strong {
  display: block;
  color: var(--ink);
  font-size: 1.05rem;
}

.cards span {
  color: var(--muted);
  font-size: 0.92rem;
}

/* Solution pages */

.crumbs {
  font-size: 0.88rem;
  color: var(--muted);
  margin: 0 0 0.6rem;
}

.crumbs a {
  color: var(--navy);
}

.puzzle-meta {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
  font-size: 0.95rem;
  color: var(--muted);
}

.puzzle-meta li {
  margin: 0.15rem 0;
}

details.spoiler {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0.4rem;
  margin: 0 0 1.25rem;
}

details.spoiler > summary {
  cursor: pointer;
  padding: 0.8rem 0.9rem;
  font-weight: 700;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

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

details.spoiler > summary::before {
  content: "+";
  display: inline-block;
  width: 1.2em;
  font-weight: 700;
  color: var(--navy);
  flex: 0 0 auto;
}

details.spoiler[open] > summary::before {
  content: "-";
}

details.spoiler > summary::after {
  content: "\25B8";
  margin-left: auto;
  font-size: 1rem;
  color: var(--muted);
  transition: transform 0.15s ease;
}

details.spoiler[open] > summary::after {
  content: "\25BE";
}

@media (prefers-reduced-motion: reduce) {
  details.spoiler > summary::after {
    transition: none;
  }
}

details.spoiler > summary:hover {
  background: var(--bg);
}

details.spoiler .gate {
  padding: 0.2rem 0.9rem 0.9rem;
  border-top: 1px dashed var(--line);
  margin-top: 0.5rem;
}

ol.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 0 0 1rem;
}

ol.steps > li {
  counter-increment: step;
  position: relative;
  padding: 0.3rem 0 0.3rem 2.3rem;
}

ol.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.35rem;
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 50%;
  background: var(--navy);
  color: #ffffff;
  font-size: 0.85rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

figure.shot {
  border: 1px dashed var(--line);
  background: var(--paper);
  padding: 0.75rem 0.9rem;
  margin: 0 0 1.25rem;
}

figure.shot figcaption {
  font-size: 0.88rem;
  color: var(--muted);
}

.slot {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 8rem;
  border: 2px dashed var(--line);
  background: var(--bg);
  color: var(--muted);
  font-size: 0.9rem;
  text-align: center;
  padding: 0.75rem;
}

.slot img {
  display: block;
  width: 100%;
  height: auto;
}

.pagenav {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: space-between;
  margin: 1.5rem 0 0;
  font-size: 0.95rem;
}

.example-banner {
  background: #fff7ed;
  border: 2px solid #9a3412;
  color: #7c2d12;
  padding: 0.6rem 0.9rem;
  font-size: 0.95rem;
  margin: 0 0 1.25rem;
}

.example-banner strong {
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

ul.sollist {
  list-style: none;
  padding: 0;
}

ul.sollist li {
  border-bottom: 1px solid var(--line);
  padding: 0.5rem 0;
}

.empty {
  background: var(--paper);
  border: 1px dashed var(--line);
  padding: 0.9rem;
  font-size: 0.98rem;
}

.faq details {
  background: var(--paper);
  border: 1px solid var(--line);
  margin: 0 0 0.5rem;
  padding: 0.6rem 0.9rem;
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
}

.faq details[open] summary {
  margin-bottom: 0.4rem;
}

footer {
  margin-top: 2.5rem;
  border-top: 1px solid var(--line);
  padding-top: 1rem;
  font-size: 0.9rem;
  color: var(--muted);
}

footer p {
  margin: 0.2rem 0;
}

code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
  background: #e7ecf2;
  padding: 0.08em 0.35em;
  border-radius: 0.25em;
}