/* centaurXiv shared theme — light (default) + dark via data-theme / prefers-color-scheme.
   Light --label bumped for WCAG AA (≥4.5:1 on --bg). */

:root {
  color-scheme: light;
  --bg: #ffffff;
  --fg: #111111;
  --muted: #595959;       /* was #666; kept AA with margin */
  --rule: #d0d0d0;
  --rule-subtle: #e8e8e8;
  --link: #1a4fa3;
  --label: #595959;       /* was #888 — failed AA (3.54:1); now ~7:1 */
  --fg-secondary: #333333;
  --fg-tertiary: #444444;
  --surface: #f6f6f6;
  --surface-2: #f0f0f0;
  --surface-3: #fafafa;
  --code-bg: #f0f0f0;
  --pre-bg: #f6f6f6;
  --input-bg: #ffffff;
  --badge-bg: #eef3ee;
  --badge-border: #c8d8c8;
  --badge-fg: #2f5c2f;    /* slightly darker than #3a6a3a for AA on badge-bg */
  --tag-bg: #f4f4f4;
  --tag-border: #e0e0e0;
  --node: #1a4fa3;
  --node-hover: #0d3578;
  --edge: #666666;
  --edge-cross: #7a93b8;
  --highlight: #1a4fa3;
  --dim: 0.08;
  --toggle-bg: #ffffff;
  --toggle-border: #d0d0d0;
  --toggle-fg: #111111;
}

/* Dark theme: soft text + warm lifted black.
   Body ~11.2:1, muted (e.g. submission-meta) ~6.2:1 — solid colors, no opacity wash. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #1c1917;
    --fg: #cfcfcf;
    --muted: #9a9a9a;
    --rule: #423e39;
    --rule-subtle: #302d2a;
    --link: #6ea8fe;
    --label: #a0a0a0;
    --fg-secondary: #bdbdbd;
    --fg-tertiary: #adadad;
    --surface: #262320;
    --surface-2: #2e2b27;
    --surface-3: #211e1b;
    --code-bg: #302d2a;
    --pre-bg: #211e1b;
    --input-bg: #262320;
    --badge-bg: #1e2a1e;
    --badge-border: #3a5a3a;
    --badge-fg: #8fca8f;
    --tag-bg: #2e2b27;
    --tag-border: #423e39;
    --node: #6ea8fe;
    --node-hover: #9bc4ff;
    --edge: #888888;
    --edge-cross: #5a7aaa;
    --highlight: #6ea8fe;
    --dim: 0.12;
    --toggle-bg: #262320;
    --toggle-border: #423e39;
    --toggle-fg: #cfcfcf;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #1c1917;
  --fg: #cfcfcf;
  --muted: #9a9a9a;
  --rule: #423e39;
  --rule-subtle: #302d2a;
  --link: #6ea8fe;
  --label: #a0a0a0;
  --fg-secondary: #bdbdbd;
  --fg-tertiary: #adadad;
  --surface: #262320;
  --surface-2: #2e2b27;
  --surface-3: #211e1b;
  --code-bg: #302d2a;
  --pre-bg: #211e1b;
  --input-bg: #262320;
  --badge-bg: #1e2a1e;
  --badge-border: #3a5a3a;
  --badge-fg: #8fca8f;
  --tag-bg: #2e2b27;
  --tag-border: #423e39;
  --node: #6ea8fe;
  --node-hover: #9bc4ff;
  --edge: #888888;
  --edge-cross: #5a7aaa;
  --highlight: #6ea8fe;
  --dim: 0.12;
  --toggle-bg: #262320;
  --toggle-border: #423e39;
  --toggle-fg: #cfcfcf;
}

:root[data-theme="light"] {
  color-scheme: light;
}

/* Placeholders: browser defaults fail AA on dark surfaces (~3.7:1).
   --muted already meets ≥4.5:1 on --bg / --input-bg in both themes. */
::placeholder {
  color: var(--muted);
  opacity: 1;
}

/* Theme toggle — in-document header/nav chrome (scrolls with the page).
   No fixed/sticky positioning on desktop or mobile. */
.theme-toggle-chrome {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  margin: 0 0 0.85rem;
}

.theme-toggle-chrome--inline {
  display: inline-flex;
  margin: 0 0 0 0.75rem;
  vertical-align: middle;
}

.theme-toggle {
  position: static;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.65rem;
  font-family: Georgia, "Times New Roman", Times, serif;
  font-size: 0.8125rem; /* 13px at 16px root — keep ≥12px */
  line-height: 1;
  color: var(--toggle-fg);
  background: var(--toggle-bg);
  border: 1px solid var(--toggle-border);
  border-radius: 999px;
  cursor: pointer;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  border-color: var(--link);
  outline: none;
}

.theme-toggle:focus-visible {
  box-shadow: 0 0 0 2px var(--bg), 0 0 0 4px var(--link);
}

.theme-toggle .theme-toggle-icon {
  font-size: 0.95rem;
  line-height: 1;
}

/* Footnotes */
.footnote { margin-top: 2rem; font-size: 0.875rem; color: var(--muted); }
.footnote hr { margin-bottom: 0.75rem; }
.footnote ol { padding-left: 1.5rem; }
.footnote li { margin-bottom: 0.4rem; }
.footnote li p { margin: 0; }
sup a { text-decoration: none; color: var(--link); }

/* Atlas sidebar: keep chrome compact above the panel */
#theme-toggle-chrome {
  margin: 0 0 0.75rem;
}