/* GEB Interactive Companion — shared design system */

:root {
  --bg: #f7f4ef;
  --text: #1a1a2e;
  --accent: #b5873b;
  --accent-secondary: #2e6b8a;
  --panel: #eeeae3;
  --border: #d4cfc7;
  --true: #3a7d44;
  --false: #8b3a3a;
  --undefined: #7a6b3a;
  --muted: #5c5c6a;
  --left-pane: 60%;
  --right-pane: 40%;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, .font-heading {
  font-family: 'EB Garamond', Georgia, serif;
  font-weight: 600;
}

h1 { font-size: 1.75rem; margin: 0 0 0.5rem 0; }
h2 { font-size: 1.35rem; margin: 1.25rem 0 0.5rem 0; }
h3 { font-size: 1.15rem; margin: 1rem 0 0.35rem 0; }
h2:first-child, h3:first-child { margin-top: 0; }

p { margin: 0 0 1rem 0; }
p:last-child { margin-bottom: 0; }

.logic, code, .mono {
  font-family: ui-monospace, 'Cascadia Code', 'Source Code Pro', monospace;
  font-size: 0.9em;
}

a {
  color: var(--accent-secondary);
  text-decoration: none;
}
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Layout: two-pane chapter pages */
.chapter-layout {
  display: flex;
  flex-wrap: wrap;
  min-height: 100vh;
}

.chapter-left {
  width: var(--left-pane);
  min-width: 280px;
  padding: 1.5rem 2rem 2rem;
  background: var(--bg);
  border-right: 1px solid var(--border);
}

.chapter-right {
  width: var(--right-pane);
  min-width: 260px;
  padding: 1.5rem 1.5rem 2rem;
  background: var(--panel);
  border-left: 1px solid var(--border);
}

@media (max-width: 900px) {
  .chapter-left,
  .chapter-right {
    width: 100%;
    border-left: none;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
}

/* Reading level switcher */
.reading-switcher {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1.25rem;
}

.reading-switcher [role="tab"],
.reading-switcher .reading-tab {
  padding: 0.4rem 0.85rem;
  font-size: 0.9rem;
  font-family: inherit;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.reading-switcher [role="tab"]:hover,
.reading-switcher .reading-tab:hover {
  background: var(--border);
  border-color: var(--accent);
}

.reading-switcher [role="tab"][aria-selected="true"],
.reading-switcher .reading-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.reading-switcher [role="tab"]:focus-visible,
.reading-switcher .reading-tab:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Content panels — only one visible */
.reading-content { display: none; }
.reading-content.on { display: block; animation: fadeIn 0.25s ease; }

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.reading-content .content-inner {
  max-width: 65ch;
}

/* Full text: PDF embed */
.fulltext-embed {
  width: 100%;
  min-height: 70vh;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #fff;
}

/* Chapter nav (prev/next) */
.chapter-nav {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.chapter-nav a {
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  background: var(--panel);
  border: 1px solid var(--border);
  color: var(--text);
  font-weight: 500;
}
.chapter-nav a:hover {
  background: var(--border);
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

/* Companion pane */
.companion-caption {
  font-style: italic;
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.companion-box {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  min-height: 200px;
}

/* Buttons */
.btn {
  padding: 0.5rem 1rem;
  font-size: 0.95rem;
  font-family: inherit;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: #9a7232; }

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-secondary:hover { background: var(--panel); border-color: var(--accent); }

/* Landing page */
.landing {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.landing .book-title {
  font-family: 'EB Garamond', Georgia, serif;
  font-size: 2.25rem;
  font-weight: 600;
  margin: 0 0 0.5rem 0;
}

.landing .book-subtitle {
  font-size: 1rem;
  color: var(--muted);
  margin: 0 0 1.5rem 0;
}

.landing .intro {
  font-size: 1.05rem;
  margin-bottom: 2rem;
  line-height: 1.7;
}

.landing .eli-note {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 2rem;
  padding: 1rem 1.25rem;
  background: var(--panel);
  border-radius: 8px;
  border-left: 4px solid var(--accent);
}

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}

.chapter-card {
  display: block;
  padding: 1.25rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.chapter-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
  text-decoration: none;
  color: var(--text);
}

.chapter-card .card-num {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
}

.chapter-card .card-title {
  font-family: 'EB Garamond', Georgia, serif;
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 0.5rem 0;
}

.chapter-card .card-desc {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.5;
  margin: 0;
}

/* Footer */
.site-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--muted);
}

.site-footer a { color: var(--accent-secondary); }

/* Utility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* Truth colors for companions */
.truth-true { color: var(--true); }
.truth-false { color: var(--false); }
.truth-undefined { color: var(--undefined); }