:root {
  --bg: #1a1a1a;
  --bg-soft: #222;
  --fg: #cccccc;
  --fg-soft: #888;
  --accent: #e8e8e8;
  --border: #2e2e2e;
  --hover: #2a2a2a;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  line-height: 1.7;
  min-height: 100vh;
}

a { color: var(--fg); text-decoration: none; }
a:hover { color: var(--accent); }

.site-header {
  padding: 24px 32px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.brand {
  font-family: var(--font-serif);
  font-size: 22px;
  letter-spacing: 4px;
  color: var(--accent);
}

.tagline {
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--fg-soft);
  text-transform: uppercase;
}

.site-footer {
  padding: 32px;
  text-align: center;
  color: var(--fg-soft);
  font-size: 12px;
  border-top: 1px solid var(--border);
  margin-top: 64px;
}

/* 书架页 */
.shelf {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 32px;
}

.shelf-title {
  font-family: var(--font-serif);
  font-size: 14px;
  letter-spacing: 8px;
  color: var(--fg-soft);
  font-weight: 400;
  margin-bottom: 32px;
}

.book-list { display: flex; flex-direction: column; gap: 4px; }

.book-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: 4px;
  transition: background 0.15s ease;
}

.book-item:hover { background: var(--hover); }

.book-title {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--accent);
}

.book-author { font-size: 12px; color: var(--fg-soft); }

/* 目录页 */
.catalog {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 32px;
}

.book-header { margin-bottom: 40px; }

.book-header h1 {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 400;
  color: var(--accent);
  margin-bottom: 8px;
}

.book-header .meta {
  font-size: 13px;
  color: var(--fg-soft);
  margin-bottom: 16px;
}

.book-header .desc {
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--fg);
  line-height: 1.9;
}

.volume-list { display: flex; flex-direction: column; gap: 32px; }

.volume-block h2 {
  font-family: var(--font-serif);
  font-size: 15px;
  letter-spacing: 4px;
  color: var(--fg-soft);
  font-weight: 400;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.chapter-list { display: flex; flex-direction: column; }

.chapter-item {
  display: block;
  padding: 10px 4px;
  font-family: var(--font-serif);
  font-size: 15px;
  color: var(--fg);
  border-bottom: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.chapter-item:hover {
  color: var(--accent);
  border-bottom-color: var(--border);
}

.state {
  color: var(--fg-soft);
  font-size: 13px;
  font-style: italic;
  padding: 24px 0;
}

.chapter {
  max-width: 680px;
  margin: 0 auto;
  padding: 64px 32px;
}

.chapter header { margin-bottom: 48px; }

.chapter h1 {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 400;
  color: var(--accent);
  margin-bottom: 8px;
}

.chapter .meta { font-size: 12px; color: var(--fg-soft); }

.chapter main {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 2;
  color: var(--fg);
}

.chapter main p { margin-bottom: 1.4em; }

@media (max-width: 600px) {
  .site-header, .shelf, .catalog, .chapter { padding-left: 20px; padding-right: 20px; }
  .brand { font-size: 18px; letter-spacing: 3px; }
}