/* Light tokens are the default. Dark tokens apply when the visitor's system
   prefers dark and no explicit choice was made, or when the theme toggle set
   data-theme="dark"; data-theme="light" keeps the light tokens even on a dark
   system, so the explicit attribute always wins over the media query. */
:root,
:root[data-theme="light"] {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1c1f23;
  --muted: #4f5660;
  --border: #d8d4cc;
  --accent: #1f5f8b;
  --quote-bg: #f2efe8;
  --error-bg: #fbe9e7;
  --error-text: #8a1c12;
  --ok-bg: #e8f3ec;
  --ok-text: #1d5b34;
  --focus: #1f5f8b;
  --button-bg: #ffffff;
  --button-text: #1c1f23;
  --badge-high-bg: #fbe4e1;
  --badge-high-text: #8a1c12;
  --badge-medium-bg: #fdf0d5;
  --badge-medium-text: #6b4300;
  --badge-low-bg: #e6eef7;
  --badge-low-text: #1f4f75;
  --badge-ok-bg: #e3f1e7;
  --badge-ok-text: #1d5b34;
  --badge-neutral-bg: #ececec;
  --badge-neutral-text: #3d4248;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #15171a;
    --surface: #1d2024;
    --text: #e8e6e1;
    --muted: #a9adb3;
    --border: #3a3e44;
    --accent: #8cc3ea;
    --quote-bg: #23272c;
    --error-bg: #3b1a17;
    --error-text: #f4b4aa;
    --ok-bg: #18301f;
    --ok-text: #a8dcb8;
    --focus: #8cc3ea;
    --button-bg: #23272c;
    --button-text: #e8e6e1;
    --badge-high-bg: #4a1d18;
    --badge-high-text: #ffc9c0;
    --badge-medium-bg: #45330f;
    --badge-medium-text: #ffdc9a;
    --badge-low-bg: #1d3346;
    --badge-low-text: #b9dcf5;
    --badge-ok-bg: #173323;
    --badge-ok-text: #b4e3c4;
    --badge-neutral-bg: #2c3036;
    --badge-neutral-text: #d3d6da;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #15171a;
  --surface: #1d2024;
  --text: #e8e6e1;
  --muted: #a9adb3;
  --border: #3a3e44;
  --accent: #8cc3ea;
  --quote-bg: #23272c;
  --error-bg: #3b1a17;
  --error-text: #f4b4aa;
  --ok-bg: #18301f;
  --ok-text: #a8dcb8;
  --focus: #8cc3ea;
  --button-bg: #23272c;
  --button-text: #e8e6e1;
  --badge-high-bg: #4a1d18;
  --badge-high-text: #ffc9c0;
  --badge-medium-bg: #45330f;
  --badge-medium-text: #ffdc9a;
  --badge-low-bg: #1d3346;
  --badge-low-text: #b9dcf5;
  --badge-ok-bg: #173323;
  --badge-ok-text: #b4e3c4;
  --badge-neutral-bg: #2c3036;
  --badge-neutral-text: #d3d6da;
  color-scheme: dark;
}

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

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

body {
  width: 100%;
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 16px 48px;
  background: var(--bg);
  color: var(--text);
  font-family:
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    sans-serif;
  font-size: 1rem;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

/* Prose keeps a comfortable measure (66ch of "0" is about 75 average
   characters); tables and requirement cards use the full container width. */
main > section > p,
main > section > ul,
.requirement > p,
.requirement > ul,
.requirement > blockquote,
.status {
  max-width: 66ch;
}

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  position: static;
  display: inline-block;
  margin-top: 8px;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

a {
  color: var(--accent);
}

.page-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 32px 0 12px;
  border-bottom: 1px solid var(--border);
}

.page-title {
  flex: 1 1 20rem;
  min-width: 0;
}

.theme-toggle {
  flex: 0 0 auto;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--button-bg);
  color: var(--button-text);
  font: inherit;
  font-size: 0.95rem;
  cursor: pointer;
}

.theme-toggle:hover {
  border-color: var(--accent);
}

.theme-toggle[hidden] {
  display: none;
}

.eyebrow {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  letter-spacing: 0.02em;
}

h1 {
  margin: 4px 0 0;
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1.2;
}

h2 {
  margin: 40px 0 12px;
  font-size: 1.35rem;
}

h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

main:focus {
  outline: none;
}

.status {
  margin: 32px 0 0;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--ok-bg);
  color: var(--ok-text);
}

.status-error {
  background: var(--error-bg);
  color: var(--error-text);
}

.statement {
  font-weight: 600;
}

.muted {
  color: var(--muted);
}

.hash {
  font-family: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
  font-size: 0.9rem;
}

.requirement {
  margin: 0 0 16px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.requirement ul {
  margin: 8px 0 0;
  padding-left: 20px;
}

blockquote {
  margin: 0;
  padding: 8px 12px;
  border-left: 4px solid var(--accent);
  background: var(--quote-bg);
}

.badge {
  display: inline-block;
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.5;
  white-space: nowrap;
}

.badge-high {
  background: var(--badge-high-bg);
  color: var(--badge-high-text);
}

.badge-medium {
  background: var(--badge-medium-bg);
  color: var(--badge-medium-text);
}

.badge-low {
  background: var(--badge-low-bg);
  color: var(--badge-low-text);
}

.badge-ok {
  background: var(--badge-ok-bg);
  color: var(--badge-ok-text);
}

.badge-neutral {
  background: var(--badge-neutral-bg);
  color: var(--badge-neutral-text);
}

.table-wrap {
  max-width: 100%;
  margin: 12px 0 20px;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

table {
  width: 100%;
  border-collapse: collapse;
}

caption {
  padding: 10px 12px 4px;
  color: var(--muted);
  font-size: 0.9rem;
  text-align: left;
}

th,
td {
  padding: 8px 12px;
  border-top: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

thead th {
  border-top: none;
  font-size: 0.9rem;
}

tbody th {
  font-weight: 600;
}