:root {
  --nav-h: 3.4rem;
  --paper: #EDF0F1;
  --surface: #FFFFFF;
  --surface-2: #F6F8F8;
  --code-bg: #F4F6F6;
  --ink: #17262E;
  --ink-soft: #45555D;
  --ink-faint: #71818A;
  --line: #D8DFDF;
  --line-strong: #BFCACA;
  --accent: #0C6C75;
  --accent-bright: #0A8996;
  --accent-wash: #E1EFEF;
  --ok: #2C7A57;
  --warn: #9C6207;
  --warn-wash: #F6ECD9;
  --danger: #B23A2C;
  --shadow: 0 1px 2px rgba(23,38,46,.05), 0 10px 30px -16px rgba(23,38,46,.16);
  --font-display: "Archivo", "Noto Sans JP", system-ui, sans-serif;
  --font-body: "Noto Serif JP", Georgia, "Times New Roman", serif;
  --font-mono: "IBM Plex Mono", "Noto Sans JP", ui-monospace, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0C1418;
    --surface: #131D23;
    --surface-2: #0F181D;
    --code-bg: #0E171C;
    --ink: #E5ECEC;
    --ink-soft: #9EADB3;
    --ink-faint: #78888F;
    --line: #24333B;
    --line-strong: #33454E;
    --accent: #37AEB8;
    --accent-bright: #52C7D1;
    --accent-wash: #10262A;
    --ok: #4CB588;
    --warn: #D69F51;
    --warn-wash: #241E12;
    --danger: #E0776A;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 12px 34px -18px rgba(0,0,0,.65);
  }
}
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.85;
  margin: 0;
  padding: 0;
}
.wp-layout {
  display: flex;
  max-width: 1300px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  gap: 2.5rem;
}
.sidebar {
  width: 280px;
  flex-shrink: 0;
  position: sticky;
  top: calc(var(--nav-h) + 1.5rem);
  height: calc(100vh - var(--nav-h) - 3rem);
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.25rem 1rem;
  font-family: var(--font-display);
  box-shadow: var(--shadow);
}
.sidebar h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
  margin-top: 0;
  margin-bottom: 0.75rem;
}
.sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.sidebar li {
  margin-bottom: 0.35rem;
}
.sidebar a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.85rem;
  display: block;
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  transition: all 0.15s;
}
.sidebar a:hover {
  color: var(--accent);
  background: var(--accent-wash);
}
.main-content {
  flex: 1;
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 3rem;
  box-shadow: var(--shadow);
}
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--ink);
  line-height: 1.3;
}
h1 { font-size: 2.2rem; margin-top: 0; margin-bottom: 0.75rem; }
h2 { font-size: 1.55rem; margin-top: 2.8rem; border-bottom: 2px solid var(--line); padding-bottom: 0.5rem; }
h3 { font-size: 1.22rem; margin-top: 1.8rem; }
p, li { font-size: 0.98rem; color: var(--ink); }
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-family: var(--font-display);
  font-size: 0.9rem;
}
th, td {
  border: 1px solid var(--line);
  padding: 0.75rem 1rem;
  text-align: left;
}
th {
  background: var(--surface-2);
  font-weight: 600;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.55;
  position: relative;
}
code {
  font-family: var(--font-mono);
  background: var(--code-bg);
  padding: 0.2em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
  border: 1px solid var(--line);
}
pre code {
  padding: 0;
  border: none;
  background: transparent;
}
.callout {
  border-left: 4px solid var(--accent);
  background: var(--accent-wash);
  padding: 1rem 1.25rem;
  border-radius: 0 8px 8px 0;
  margin: 1.5rem 0;
}
.callout-title {
  font-weight: 700;
  font-family: var(--font-display);
  margin-bottom: 0.4rem;
  color: var(--accent);
}
.callout-warn {
  border-left-color: var(--warn);
  background: var(--warn-wash);
}
.callout-warn .callout-title {
  color: var(--warn);
}

@media (max-width: 900px) {
  .wp-layout { flex-direction: column; }
  .sidebar { width: 100%; position: static; height: auto; }
  .main-content { padding: 1.75rem; }
}