/* ========== Koan Pages — Shared Styles ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --ink: #1a1a1a;
  --ink-soft: #4a4a4a;
  --ink-muted: #7a7a7a;
  --bg: #faf9f6;
  --bg-card: #ffffff;
  --bg-alt: #f4f1eb;
  --accent: #8b6914;
  --accent-soft: #c9a84c;
  --accent-bg: #faf5eb;
  --line: #e8e4dc;
  --shadow: 0 2px 24px rgba(0,0,0,.06);
  --radius: 8px;
  --max-w: 1100px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
}
html { scroll-behavior: smooth; }
body {
  font-family: "Georgia", "Noto Serif", serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.75;
  font-size: clamp(1rem, 1.05vw, 1.125rem);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent-soft); }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 var(--gutter); }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(250,249,246,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between; height: 64px;
}
.logo { font-size: 1.25rem; font-weight: 700; color: var(--ink); letter-spacing: .02em; }
.logo span { color: var(--accent); }
.header-nav { display: flex; gap: 1.5rem; font-family: system-ui, sans-serif; font-size: .85rem; font-weight: 600; }
.header-nav a { color: var(--ink-soft); }
.header-nav a:hover { color: var(--accent); }

/* Breadcrumb */
.breadcrumb { padding: .75rem 0; font-size: .85rem; color: var(--ink-muted); font-family: system-ui, sans-serif; }
.breadcrumb a { color: var(--ink-muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { margin: 0 .5rem; opacity: .5; }

/* Koan Hero */
.koan-hero {
  text-align: center;
  padding: clamp(2rem, 6vw, 4.5rem) 0 clamp(1.5rem, 3vw, 2.5rem);
}
.koan-number {
  display: inline-block;
  font-family: system-ui, sans-serif;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-right: .75rem;
}
.koan-theme {
  display: inline-block;
  font-family: system-ui, sans-serif;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--accent-soft);
  padding: .2em .8em;
  border-radius: 999px;
}
.koan-hero h1 {
  font-size: clamp(1.8rem, 4.5vw, 3rem);
  line-height: 1.15;
  font-weight: 700;
  margin: 1rem 0 .5rem;
}
.koan-subtitle {
  font-size: clamp(1rem, 1.8vw, 1.15rem);
  color: var(--ink-soft);
  max-width: 600px;
  margin: 0 auto;
}

/* Grid */
.koan-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 2.5rem;
  align-items: start;
}

/* Main content */
.koan-main { min-width: 0; }
.section-heading {
  font-size: clamp(1.15rem, 2.5vw, 1.4rem);
  font-weight: 700;
  margin-bottom: 1rem;
  padding-left: 1rem;
  position: relative;
}
.section-heading::before {
  content: '';
  position: absolute; left: 0; top: .15em; bottom: .15em;
  width: 4px; background: var(--accent); border-radius: 2px;
}

.koan-text-block {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  box-shadow: var(--shadow);
  margin-bottom: 2.5rem;
}
.koan-chinese {
  font-size: 1.05rem;
  line-height: 1.9;
  padding-bottom: 1.25rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
}
.koan-english { color: var(--ink-soft); }
.koan-quote {
  font-size: 1.1rem;
  font-style: italic;
  border-left: 3px solid var(--accent-soft);
  padding: .75rem 0 .75rem 1.25rem;
  margin: 1rem 0;
  color: var(--ink);
}

.koan-analysis, .koan-reflection, .koan-practice {
  margin-bottom: 2.5rem;
}
.koan-analysis p, .koan-reflection p {
  margin-bottom: 1rem;
  max-width: 680px;
}

.practice-box {
  background: var(--accent-bg);
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1.25rem 1.5rem;
  font-style: italic;
  max-width: 600px;
}

/* Sidebar */
.koan-sidebar { display: flex; flex-direction: column; gap: 1.25rem; }
.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
}
.sidebar-card h3 {
  font-family: system-ui, sans-serif;
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--accent);
  margin-bottom: .5rem;
}
.sidebar-card p, .sidebar-card li {
  font-size: .88rem;
  color: var(--ink-soft);
  line-height: 1.6;
}
.sidebar-card ul { list-style: none; }
.sidebar-card li { margin-bottom: .4rem; }
.sidebar-card li::before { content: '·'; margin-right: .4rem; color: var(--accent-soft); }

/* Footer nav */
.koan-footer-nav {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0;
  margin-top: 1rem;
}
.koan-nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 1rem;
}
.nav-back {
  font-family: system-ui, sans-serif;
  font-size: .85rem;
  font-weight: 600;
  color: var(--ink-muted);
}
.nav-back:hover { color: var(--accent); }
.nav-arrows { display: flex; gap: 1.5rem; }
.nav-arrows a, .nav-arrows span {
  font-family: system-ui, sans-serif;
  font-size: .85rem;
  font-weight: 600;
}
.nav-arrows .disabled { color: var(--ink-muted); opacity: .4; pointer-events: none; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0;
  text-align: center;
  font-size: .8rem;
  color: var(--ink-muted);
  font-family: system-ui, sans-serif;
}
.site-footer a { color: var(--ink-muted); }
.site-footer a:hover { color: var(--accent); }

/* Responsive */
@media (max-width: 900px) {
  .koan-grid {
    grid-template-columns: 1fr;
  }
  .koan-sidebar {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 240px), 1fr));
    gap: 1rem;
  }
}
@media (max-width: 480px) {
  .koan-hero h1 { font-size: 1.6rem; }
  .koan-text-block { padding: 1.25rem; }
  .koan-nav-inner { flex-direction: column; align-items: flex-start; }
}