/* theme.css - additive site-wide layer, loaded after each page's inline <style>.
   Provides:
     1. <picture> block behaviour and keyboard focus-visible styles
     2. Dark mode, driven by a manual toggle (data-theme on <html>) with the
        system preference as the default. theme-toggle.js resolves and sets
        data-theme before paint; the media query below is a no-JS fallback.
   Dark declarations are intentionally duplicated (manual + fallback) because a
   media-wrapped selector cannot be comma-joined with a plain one. */

/* <picture> wrappers should behave as block-level image containers */
/* Keyboard focus - visible ring for links, buttons, and interactive widgets */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 1px;
}
.slider-container:focus:not(:focus-visible) { outline: none; }

/* ── Dark palette + component fixes, shared by both triggers ─────────────── */
:root[data-theme="dark"] {
  --paper:     #14110b;
  --ink:       #ece7db;
  --ink-soft:  #cfc9bb;
  --ink-faded: #9a9284;
  --rule:      #3a362d;
  --accent:    #d07a63;
  color-scheme: dark;
}
:root[data-theme="dark"] .entry-thumb,
:root[data-theme="dark"] .slider-container,
:root[data-theme="dark"] .slider-container img,
:root[data-theme="dark"] .image-figure img { background: #211c14; }
:root[data-theme="dark"] .slider-label { color: #f5f2eb; background: rgba(0,0,0,0.6); }
:root[data-theme="dark"] .slider-handle,
:root[data-theme="dark"] .slider-handle::before,
:root[data-theme="dark"] .slider-handle::after { background: #ece7db; border-color: #ece7db; }
:root[data-theme="dark"] .entry-thumb,
:root[data-theme="dark"] .image-figure img,
:root[data-theme="dark"] .slider-container img { filter: brightness(0.92); }

/* No-JS fallback: honour the system preference until the toggle sets data-theme */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --paper:     #14110b;
    --ink:       #ece7db;
    --ink-soft:  #cfc9bb;
    --ink-faded: #9a9284;
    --rule:      #3a362d;
    --accent:    #d07a63;
    color-scheme: dark;
  }
  :root:not([data-theme]) .entry-thumb,
  :root:not([data-theme]) .slider-container,
  :root:not([data-theme]) .slider-container img,
  :root:not([data-theme]) .image-figure img { background: #211c14; }
  :root:not([data-theme]) .slider-label { color: #f5f2eb; background: rgba(0,0,0,0.6); }
  :root:not([data-theme]) .slider-handle,
  :root:not([data-theme]) .slider-handle::before,
  :root:not([data-theme]) .slider-handle::after { background: #ece7db; border-color: #ece7db; }
  :root:not([data-theme]) .entry-thumb,
  :root:not([data-theme]) .image-figure img,
  :root:not([data-theme]) .slider-container img { filter: brightness(0.92); }
}

/* ── Theme toggle button (created by theme-toggle.js) ───────────────────── */
.theme-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 50;
  width: 2.4rem;
  height: 2.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--rule);
  border-radius: 50%;
  background: var(--paper);
  color: var(--ink-soft);
  cursor: pointer;
  line-height: 0;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
.theme-toggle svg { width: 1.15rem; height: 1.15rem; display: block; }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme]) .theme-toggle .icon-moon { display: none; }
}
@media print { .theme-toggle { display: none; } }

/* ── Citation block (archive item pages) ────────────────────────────────── */
.citation blockquote {
  font-size: 0.95rem;
  color: var(--ink-soft);
  line-height: 1.6;
  padding: 1rem 1.1rem;
  border: 1px solid var(--rule);
  background: rgba(0,0,0,0.015);
  margin-bottom: 0.85rem;
}
:root[data-theme="dark"] .citation blockquote { background: rgba(255,255,255,0.03); }
.copy-cite {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.9rem;
  color: var(--ink-soft);
  background: none;
  border: none;
  border-bottom: 1px solid var(--rule);
  padding: 0 0 1px;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.copy-cite:hover { color: var(--accent); border-bottom-color: var(--accent); }
.zoom-hint { color: var(--ink-faded); font-style: italic; }
