:root {
  color-scheme: light dark;
  --bg: #f5f7fa;
  --bg-gradient: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0) 340px);
  --surface: #ffffff;
  --surface-soft: #f0f4f7;
  --text: #17202a;
  --muted: #5f6d7a;
  --muted-strong: #41505f;
  --border: #d8e0e8;
  --border-strong: #bac7d5;
  --accent: #007f73;
  --accent-dark: #005f56;
  --blue: #3157a6;
  --amber: #9b6100;
  --source-id-bg: #eff8f6;
  --source-id-border: #d3e4e1;
  --source-id-text: #064b44;
  --auth-bg: #fff2d8;
  --topbar-bg: rgba(255, 255, 255, 0.94);
  --focus: rgba(0, 127, 115, 0.22);
  --shadow: 0 18px 42px rgba(29, 42, 55, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --bg: #111821;
    --bg-gradient: linear-gradient(180deg, rgba(28, 40, 52, 0.86), rgba(17, 24, 33, 0) 340px);
    --surface: #17212c;
    --surface-soft: #202c38;
    --text: #edf3f8;
    --muted: #9caab7;
    --muted-strong: #c1ccd6;
    --border: #2a3946;
    --border-strong: #40515f;
    --accent: #28b8a8;
    --accent-dark: #72d9cf;
    --blue: #8bb3ff;
    --amber: #f3bf5f;
    --source-id-bg: #14362f;
    --source-id-border: #1c5e52;
    --source-id-text: #91e3d7;
    --auth-bg: #3a2b13;
    --topbar-bg: rgba(18, 27, 37, 0.94);
    --focus: rgba(40, 184, 168, 0.34);
    --shadow: 0 18px 42px rgba(0, 0, 0, 0.24);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111821;
  --bg-gradient: linear-gradient(180deg, rgba(28, 40, 52, 0.86), rgba(17, 24, 33, 0) 340px);
  --surface: #17212c;
  --surface-soft: #202c38;
  --text: #edf3f8;
  --muted: #9caab7;
  --muted-strong: #c1ccd6;
  --border: #2a3946;
  --border-strong: #40515f;
  --accent: #28b8a8;
  --accent-dark: #72d9cf;
  --blue: #8bb3ff;
  --amber: #f3bf5f;
  --source-id-bg: #14362f;
  --source-id-border: #1c5e52;
  --source-id-text: #91e3d7;
  --auth-bg: #3a2b13;
  --topbar-bg: rgba(18, 27, 37, 0.94);
  --focus: rgba(40, 184, 168, 0.34);
  --shadow: 0 18px 42px rgba(0, 0, 0, 0.24);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  background:
    var(--bg-gradient),
    var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

button {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 20;
  transform: translateY(-140%);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  background: var(--surface);
  color: var(--text);
  padding: 0.55rem 0.7rem;
  box-shadow: var(--shadow);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-shell {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid rgba(216, 224, 232, 0.9);
  background: var(--topbar-bg);
  backdrop-filter: blur(16px);
}

.topbar-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text);
  font-weight: 800;
}

.brand:hover {
  text-decoration: none;
}

.brand-logo-wrap {
  display: inline-grid;
  align-items: center;
  justify-content: center;
  min-width: 8.7rem;
  min-height: 2.25rem;
  line-height: 0;
}

.brand-logo {
  grid-area: 1 / 1;
  width: 8.7rem;
  height: auto;
  display: block;
}

.brand-logo-dark {
  display: none;
  filter: drop-shadow(0 1px 0 rgba(0, 0, 0, 0.36));
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .brand-logo-light {
    display: none;
  }

  :root:not([data-theme]) .brand-logo-dark {
    display: block;
  }
}

:root[data-theme="dark"] .brand-logo-light {
  display: none;
}

:root[data-theme="dark"] .brand-logo-dark {
  display: block;
}

.brand-title {
  color: var(--text);
  font-weight: 900;
  line-height: 1;
  white-space: nowrap;
  transform: translateY(0.25rem);
}

.topnav {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.topnav a {
  color: var(--muted-strong);
}

.theme-toggle {
  display: none;
  width: 2rem;
  min-height: 2rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted-strong);
  padding: 0;
  cursor: pointer;
}

.has-js .theme-toggle {
  display: inline-flex;
}

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

.theme-toggle-icon {
  width: 0.78rem;
  height: 0.78rem;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: inset -0.24rem -0.18rem 0 rgba(255, 255, 255, 0.78);
}

:root[data-theme="dark"] .theme-toggle-icon {
  background: var(--amber);
  box-shadow: 0 0 0 0.16rem rgba(243, 191, 95, 0.16);
}

.intro {
  padding: 3.2rem 0 1.1rem;
}

.eyebrow {
  margin: 0 0 0.7rem;
  color: var(--accent-dark);
  font-size: 0.84rem;
  font-weight: 800;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 0.8rem;
  font-size: 3rem;
  line-height: 1.04;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0.15rem;
  font-size: 1.2rem;
  line-height: 1.25;
}

h3 {
  margin-bottom: 0.35rem;
  font-size: 1.05rem;
  line-height: 1.25;
}

.lead {
  max-width: 760px;
  margin-bottom: 1.35rem;
  color: var(--muted-strong);
  font-size: 1.08rem;
}

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

.source-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border: 1px solid var(--border-strong);
  border-radius: 7px;
  background: var(--surface);
  color: var(--text);
  padding: 0.45rem 0.75rem;
  font-size: 0.9rem;
  font-weight: 800;
  white-space: nowrap;
}

.source-link:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
  text-decoration: none;
}

.source-section {
  padding: 1rem 0;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.85rem;
}

.section-heading p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.source-list {
  display: grid;
  gap: 0.85rem;
}

.source-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 0.34fr);
  gap: 1.25rem;
  scroll-margin-top: 5.5rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  padding: 1rem;
}

.source-card:hover {
  border-color: var(--border-strong);
}

.source-card:target {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--focus);
}

.source-kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.55rem;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", ui-monospace, monospace;
}

.source-id {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  border: 1px solid var(--source-id-border);
  border-radius: 7px;
  background: var(--source-id-bg);
  color: var(--source-id-text);
  padding: 0.18rem 0.38rem;
  overflow-wrap: anywhere;
  font-size: 0.86rem;
  line-height: 1.35;
}

.source-id:hover {
  border-color: var(--accent);
  text-decoration: none;
}

.auth-pill {
  display: inline-flex;
  min-height: 1.55rem;
  align-items: center;
  border-radius: 999px;
  background: var(--auth-bg);
  color: var(--amber);
  padding: 0.15rem 0.5rem;
  font-size: 0.78rem;
  font-weight: 800;
}

.ruleset-description {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.source-meta {
  display: grid;
  gap: 0.7rem;
  align-content: start;
  margin: 0;
  border-left: 1px solid var(--border);
  padding-left: 1rem;
}

.source-meta div {
  min-width: 0;
}

.source-meta dt {
  margin-bottom: 0.1rem;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.source-meta dd {
  margin: 0;
  color: var(--text);
  overflow-wrap: anywhere;
  font-size: 0.94rem;
}

.link-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.not-listed {
  color: var(--muted);
}

.empty-state {
  margin-top: 1rem;
  border: 1px dashed var(--border-strong);
  border-radius: 8px;
  background: var(--surface);
  padding: 1.25rem;
  text-align: center;
}

.empty-state p {
  margin: 0.2rem 0 0;
  color: var(--muted);
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 2rem 0 2.4rem;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 820px) {
  .topbar-inner,
  .footer,
  .section-heading {
    align-items: stretch;
    flex-direction: column;
  }

  .topbar-inner {
    min-height: auto;
    padding: 0.8rem 0;
  }

  .topnav {
    flex-wrap: wrap;
  }

  .intro {
    padding-top: 1.6rem;
  }

  h1 {
    font-size: 2.2rem;
  }

  .source-card {
    grid-template-columns: 1fr;
  }

  .source-meta {
    border-left: 0;
    border-top: 1px solid var(--border);
    padding-top: 0.9rem;
    padding-left: 0;
  }

}

@media (max-width: 460px) {
  .site-shell {
    width: min(100% - 1rem, 1120px);
  }

  h1 {
    font-size: 1.9rem;
  }

  .source-card {
    padding: 0.85rem;
  }
}