:root {
  color-scheme: light;
  --cp-bg: #f7f4ef;
  --cp-bg-elevated: #fcfbf8;
  --cp-surface: #ffffff;
  --cp-surface-soft: #f5f5f5;
  --cp-border: #dedede;
  --cp-border-strong: #919191;
  --cp-text: #242424;
  --cp-text-muted: #5c5c5c;
  --cp-text-soft: #6f6f6f;
  --cp-accent: #b11f4b;
  --cp-accent-hover: #9a1a41;
  --cp-accent-soft: rgba(177, 31, 75, 0.08);
  --cp-accent-fg: #ffffff;
  --cp-success: #16a34a;
  --cp-danger: #dc2626;
  --cp-warning: #f59e0b;
  --cp-link: #0078d4;
  --cp-shadow: 0 18px 48px rgba(0, 0, 0, 0.12);
  --cp-overlay: rgba(255, 255, 255, 0.8);
  --cp-panel: rgba(255, 255, 255, 0.86);
  --cp-panel-strong: rgba(255, 255, 255, 0.96);
  --cp-sheen: rgba(255, 255, 255, 0.55);
  --cp-highlight: rgba(177, 31, 75, 0.12);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --cp-bg: #3d3b3a;
  --cp-bg-elevated: #343231;
  --cp-surface: #292929;
  --cp-surface-soft: #2e2e2e;
  --cp-border: #474747;
  --cp-border-strong: #5f5f5f;
  --cp-text: #dedede;
  --cp-text-muted: #919191;
  --cp-text-soft: #b0b0b0;
  --cp-accent: #fd8ea1;
  --cp-accent-hover: #fb7b91;
  --cp-accent-soft: rgba(253, 142, 161, 0.14);
  --cp-accent-fg: #1a1a1a;
  --cp-success: #4ade80;
  --cp-danger: #f87171;
  --cp-warning: #fbbf24;
  --cp-link: #4da6ff;
  --cp-shadow: 0 18px 48px rgba(0, 0, 0, 0.32);
  --cp-overlay: rgba(41, 41, 41, 0.88);
  --cp-panel: rgba(41, 41, 41, 0.72);
  --cp-panel-strong: rgba(41, 41, 41, 0.96);
  --cp-sheen: rgba(255, 255, 255, 0.04);
  --cp-highlight: rgba(253, 142, 161, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--cp-bg);
  color: var(--cp-text);
  font: 16px/1.85 "Segoe UI", Aptos, Calibri, -apple-system, BlinkMacSystemFont, sans-serif;
}
a { color: var(--cp-link); text-underline-offset: 4px; }
a:hover { color: var(--cp-accent-hover); }
:focus-visible { outline: 3px solid var(--cp-accent); outline-offset: 4px; }
[id] { scroll-margin-top: 24px; }
p { margin: 10px 0; }
code { font-family: Consolas, "Courier New", Courier, monospace; }
.wrap { max-width: 1248px; margin: auto; padding: 28px 32px 80px; }
.hero {
  padding: 40px;
  margin-bottom: 28px;
  background: var(--cp-surface);
  border: 1px solid var(--cp-border);
  border-top: 4px solid var(--cp-accent);
  border-radius: 16px;
}
.hero .k, .hero .kicker {
  color: var(--cp-accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  margin: 0 0 16px;
}
.hero h1 { margin: 0 0 20px; font-size: clamp(30px, 3.4vw, 44px); line-height: 1.3; }
.hero .s, .hero .meta { margin: 0; font-size: 15px; color: var(--cp-text-muted); }
.intro, .lead {
  padding: 20px 24px;
  margin: 0 0 28px;
  color: var(--cp-text-muted);
  background: var(--cp-bg-elevated);
  border: 1px solid var(--cp-border);
  border-left: 4px solid var(--cp-border-strong);
  border-radius: .625rem;
}
.section-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin: 28px 0 16px; flex-wrap: wrap; }
.section-heading h2 { margin: 0; font-size: 22px; }
.sort-note { margin: 0; color: var(--cp-text-muted); font-size: 14px; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
a.card {
  display: flex;
  flex-direction: column;
  padding: 24px;
  text-decoration: none;
  color: var(--cp-text);
  background: var(--cp-surface);
  border: 1px solid var(--cp-border);
  border-radius: 16px;
}
a.card:hover { border-color: var(--cp-accent); background: var(--cp-accent-soft); }
a.card h2 { margin: 0 0 12px; font-size: 24px; line-height: 1.4; }
a.card p.c { margin: 0; font-size: 15px; font-weight: 600; }
a.card p.meta { margin: 12px 0 20px; font-size: 14px; color: var(--cp-text-muted); }
.card-foot { margin-top: auto; color: var(--cp-accent); font-size: 14px; font-weight: 650; }
.note {
  font-size: 14px;
  color: var(--cp-text-muted);
  background: var(--cp-bg-elevated);
  border: 1px dashed var(--cp-border);
  border-radius: .625rem;
  padding: 16px 20px;
  margin-top: 12px;
}
.page-index .note { margin-top: 32px; }
.note b { color: var(--cp-text); }
.note ul { margin: 8px 0 0; padding-left: 20px; }
.note li { margin: 5px 0; }
footer { margin-top: 36px; padding-top: 24px; border-top: 1px solid var(--cp-border); font-size: 13px; color: var(--cp-text-muted); }

/* Keep the floating overview control outside the desktop reading column. */
.page-month { padding-right: 112px; }
.layout { display: grid; grid-template-columns: 224px minmax(0, 1fr); gap: 28px; align-items: start; }
.sidebar {
  position: sticky;
  top: 20px;
  max-height: calc(100dvh - 40px);
  overflow-y: auto;
  padding: 20px;
  background: var(--cp-surface);
  border: 1px solid var(--cp-border);
  border-radius: 16px;
}
.sidebar h2 { margin: 0 0 12px; font-size: 16px; }
.month-links { display: grid; gap: 4px; }
.month-links a { display: flex; align-items: center; min-height: 44px; padding: 8px 12px; color: var(--cp-text-muted); text-decoration: none; border-radius: .625rem; font-size: 15px; }
.month-links a:hover { color: var(--cp-accent); background: var(--cp-accent-soft); }
.month-links a[aria-current="page"] { color: var(--cp-accent); background: var(--cp-accent-soft); font-weight: 700; }
.sidebar .back { display: block; margin-top: 16px; padding: 16px 0 0; border-top: 1px solid var(--cp-border); font-size: 14px; }
.content { min-width: 0; overflow-wrap: anywhere; }
.content .hero { padding: 32px; }
.content h1 { font-size: clamp(28px, 3vw, 40px); }
.content h2 { font-size: 22px; margin: 40px 0 16px; padding-bottom: 10px; border-bottom: 2px solid var(--cp-accent); }
.content h3 { font-size: 19px; margin: 28px 0 12px; color: var(--cp-accent); }
section.card { background: var(--cp-surface); border: 1px solid var(--cp-border); border-radius: 16px; padding: 4px 28px 28px; margin-bottom: 24px; }
.toc { background: var(--cp-surface); border: 1px solid var(--cp-border); border-radius: 16px; padding: 24px 28px; margin-bottom: 36px; }
.toc h2 { margin: 0 0 16px; font-size: 22px; border: none; padding: 0; }
.toc ul { margin: 8px 0 16px; padding-left: 22px; }
.toc ul:last-child { margin-bottom: 0; }
.toc li { margin: 6px 0; }
.toc a { color: var(--cp-accent); text-decoration: none; }
.toc a:hover { text-decoration: underline; }
.toc:target { border-color: var(--cp-accent); }
.tag { display: inline-block; font-size: 12px; font-weight: 600; padding: 2px 10px; border: 1px solid var(--cp-border); border-radius: .625rem; background: var(--cp-accent-soft); color: var(--cp-accent); margin-left: 6px; vertical-align: middle; }
.tag.done { background: var(--cp-surface-soft); color: var(--cp-text); border-color: var(--cp-success); }
.tag.soon { background: var(--cp-surface-soft); color: var(--cp-text); border-color: var(--cp-warning); }
.highlight { background: var(--cp-accent-soft); border: 1px solid var(--cp-border); border-radius: .625rem; padding: 16px 20px; margin: 14px 0; }
ul.feat { padding-left: 22px; margin: 8px 0; }
ul.feat li { margin: 8px 0; }
table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 15px; }
th, td { border: 1px solid var(--cp-border); padding: 9px 12px; text-align: left; vertical-align: top; }
th { background: var(--cp-accent-soft); color: var(--cp-accent); }
figure { margin: 20px 0; }
figure img { width: 100%; height: auto; display: block; border: 1px solid var(--cp-border); border-radius: .625rem; background: var(--cp-surface); }
figure.banner img { border: none; }
figcaption { font-size: 13px; color: var(--cp-text-muted); margin-top: 8px; text-align: center; line-height: 1.6; }
.vwrap { position: relative; padding-top: 56.25%; border: 1px solid var(--cp-border); border-radius: .625rem; overflow: hidden; background: var(--cp-surface-soft); }
.vwrap iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0; }
.back-to-overview {
  position: fixed;
  right: 20px;
  bottom: 28px;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 88px;
  min-height: 76px;
  padding: 12px 8px;
  background: var(--cp-accent);
  color: var(--cp-accent-fg);
  border: 1px solid var(--cp-accent);
  border-radius: .625rem;
  font-size: 13px;
  font-weight: 650;
  text-decoration: none;
  line-height: 1.4;
}
.back-to-overview svg { width: 22px; height: 22px; }
.back-to-overview:hover { background: var(--cp-accent-hover); border-color: var(--cp-accent-hover); color: var(--cp-accent-fg); }
@media (max-width: 1100px) {
  .layout { grid-template-columns: 180px minmax(0, 1fr); gap: 20px; }
  .sidebar { padding: 16px; }
  .page-month .wrap { padding-left: 24px; padding-right: 16px; }
}
@media (max-width: 960px) {
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .page-month { padding-right: 0; }
  .wrap, .page-month .wrap { padding: 20px 16px 120px; }
  .layout { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .sidebar { position: static; max-height: none; overflow: visible; }
  .month-links { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .month-links a { padding: 8px; font-size: 14px; }
  .hero, .content .hero { padding: 24px; }
  .hero h1 { font-size: 28px; }
  section.card { padding: 4px 20px 20px; }
  .toc, .intro, .lead { padding: 20px; }
  .back-to-overview { width: 76px; min-height: 64px; padding: 8px 4px; right: 12px; bottom: calc(16px + env(safe-area-inset-bottom)); font-size: 12px; }
  th, td { padding: 8px; }
}
@media (max-width: 520px) {
  .grid { grid-template-columns: minmax(0, 1fr); }
  .month-links { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}
@media print {
  .sidebar, .back-to-overview { display: none !important; }
  .page-month { padding-right: 0; }
  .wrap, .page-month .wrap { max-width: none; padding: 0; }
  .layout { display: block; }
  .hero, .content .hero { padding: 20px; }
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  figure, .toc { break-inside: avoid; }
  body { font-size: 11pt; }
}