:root {
  --bg: #1b1d24;
  --bg-raised: #23262f;
  --text: #e8e6e1;
  --text-dim: #9b9da6;
  --accent: #e3a857;
  --border: #33363f;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
}

a { color: inherit; text-decoration: none; }

/* ---------- Overview page ---------- */

.site-header {
  padding: 48px 24px 24px;
  text-align: center;
}

.wordmark {
  font-family: 'Bitter', serif;
  font-weight: 800;
  font-size: clamp(28px, 5vw, 44px);
  letter-spacing: -0.01em;
}

.chapter-grid {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 24px;
}

.chapter-card {
  display: block;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.chapter-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.chapter-card img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  display: block;
  background: var(--border);
}

.chapter-card-body {
  padding: 14px 16px 18px;
}

.chapter-number {
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
}

.chapter-title {
  font-family: 'Bitter', serif;
  font-weight: 600;
  font-size: 18px;
  margin-top: 2px;
}

.site-footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 13px;
  padding: 40px 24px;
}

/* ---------- Reader page ---------- */

.reader-body {
  padding-bottom: 80px;
}

.reader-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  background: rgba(27, 29, 36, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}

.back-link {
  color: var(--accent);
  font-size: 14px;
  font-weight: 500;
}

.reader-title {
  font-family: 'Bitter', serif;
  font-weight: 600;
  font-size: 15px;
  color: var(--text-dim);
}

.page-strip {
  max-width: 900px;
  margin: 0 auto;
}

.page-strip img {
  display: block;
  width: var(--zoom, 100%);
  margin: 0 auto;
}

.chapter-nav {
  max-width: 900px;
  margin: 24px auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.nav-btn {
  flex: 1;
  text-align: center;
  padding: 12px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-weight: 500;
}

.nav-btn.disabled {
  opacity: 0.4;
  pointer-events: none;
}

.zoom-bar {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 12px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.35);
}

.zoom-bar button {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  cursor: pointer;
}

.zoom-bar button:hover { color: var(--accent); }

#zoom-reset {
  width: auto;
  border-radius: 999px;
  padding: 0 12px;
  font-size: 13px;
}

#zoom-level {
  font-size: 13px;
  color: var(--text-dim);
  min-width: 40px;
  text-align: center;
}