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

:root {
  --paper: #faf8f5;
  --ink: #2c2416;
  --ink-soft: #3d3226;
  --muted: #8b7355;
  --faint: #b8a898;
  --line: #e0d5c7;
  --serif: "Noto Serif SC", "Source Han Serif SC", "STSong", "Songti SC", Georgia, serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--serif);
  background: var(--paper);
  color: var(--ink);
  line-height: 2;
  -webkit-font-smoothing: antialiased;
}

/* ===== 总览 / 首屏 ===== */
.cover {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  position: relative;
  background:
    radial-gradient(120% 80% at 50% 0%, #f3ece1 0%, var(--paper) 55%),
    linear-gradient(180deg, #f6efe4, var(--paper));
  overflow: hidden;
}
.cover::before,
.cover::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
  opacity: 0.35;
}
.cover::before {
  width: 280px; height: 280px;
  background: radial-gradient(circle, #cdb89a 0%, transparent 70%);
  top: -60px; left: -40px;
}
.cover::after {
  width: 360px; height: 360px;
  background: radial-gradient(circle, #b9c7b0 0%, transparent 70%);
  bottom: -120px; right: -80px;
}
.cover-inner {
  position: relative;
  text-align: center;
  max-width: 620px;
}
.cover-tag {
  font-size: 13px;
  letter-spacing: 6px;
  color: var(--muted);
  margin-bottom: 28px;
}
.cover-title {
  font-size: clamp(44px, 11vw, 88px);
  font-weight: 600;
  letter-spacing: 8px;
  color: var(--ink-soft);
  line-height: 1.25;
  margin-bottom: 28px;
}
.cover-sub {
  font-size: clamp(15px, 2.6vw, 18px);
  font-weight: 300;
  color: var(--muted);
  line-height: 2.1;
  letter-spacing: 1px;
}
.cover-scroll {
  margin-top: 56px;
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--faint);
  animation: float 2.4s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); opacity: 0.6; }
  50% { transform: translateY(7px); opacity: 1; }
}

/* ===== 目录 ===== */
.toc {
  max-width: 760px;
  margin: 0 auto;
  padding: 80px 24px 40px;
}
.toc-head { text-align: center; margin-bottom: 52px; }
.toc-label {
  font-size: 13px;
  letter-spacing: 5px;
  color: var(--muted);
}
.toc-head h2 {
  font-size: 30px;
  font-weight: 500;
  color: var(--ink-soft);
  margin: 12px 0 22px;
  letter-spacing: 4px;
}
.toc-desc {
  font-size: 15px;
  font-weight: 300;
  color: var(--muted);
  line-height: 2.1;
  max-width: 540px;
  margin: 0 auto;
}
.toc-list { list-style: none; }

.toc-item {
  display: flex;
  gap: 20px;
  align-items: stretch;
  padding: 20px;
  margin-bottom: 18px;
  background: #fffdfa;
  border: 1px solid var(--line);
  cursor: pointer;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.toc-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px -16px rgba(80, 60, 30, 0.35);
  border-color: #d2c2ac;
}
.toc-thumb {
  width: 116px;
  min-width: 116px;
  height: 116px;
  object-fit: cover;
  background: #efe7da;
}
.toc-meta { display: flex; flex-direction: column; justify-content: center; }
.toc-num {
  font-size: 12px;
  letter-spacing: 4px;
  color: var(--muted);
  margin-bottom: 6px;
}
.toc-title {
  font-size: 22px;
  font-weight: 500;
  color: var(--ink-soft);
  letter-spacing: 2px;
  margin-bottom: 8px;
}
.toc-summary {
  font-size: 14px;
  font-weight: 300;
  color: var(--muted);
  line-height: 1.85;
}

.site-footer {
  text-align: center;
  color: var(--faint);
  font-size: 13px;
  letter-spacing: 2px;
  padding: 40px 24px 60px;
}

/* ===== 阅读视图 ===== */
.reader { min-height: 100vh; }
.reader-bar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 22px;
  background: rgba(250, 248, 245, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.bar-btn {
  font-family: var(--serif);
  font-size: 15px;
  color: var(--ink-soft);
  background: none;
  border: none;
  cursor: pointer;
  letter-spacing: 1px;
  padding: 4px 2px;
}
.bar-btn:hover { color: var(--muted); }
.bar-crumb {
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--faint);
}
.reader-hero {
  width: 100%;
  max-height: 56vh;
  object-fit: cover;
  display: block;
  background: #efe7da;
}
.reader-body {
  max-width: 680px;
  margin: 0 auto;
  padding: 48px 24px 40px;
}
.chapter-num {
  font-size: 13px;
  letter-spacing: 4px;
  color: var(--muted);
  margin-bottom: 8px;
}
.reader-body h1 {
  font-size: 30px;
  font-weight: 500;
  color: var(--ink-soft);
  letter-spacing: 3px;
  margin-bottom: 36px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}
.reader-body p {
  font-size: 16px;
  margin-bottom: 20px;
  text-align: justify;
  text-indent: 2em;
}

/* ===== 章节导航 ===== */
.reader-nav {
  max-width: 680px;
  margin: 0 auto;
  padding: 12px 24px 0;
  display: flex;
  gap: 14px;
  justify-content: space-between;
}
.nav-btn {
  flex: 1;
  font-family: var(--serif);
  font-size: 15px;
  letter-spacing: 1px;
  color: var(--ink-soft);
  background: #fffdfa;
  border: 1px solid var(--line);
  padding: 16px 18px;
  cursor: pointer;
  transition: background .2s ease, border-color .2s ease, color .2s ease;
}
.nav-btn:hover:not(:disabled) {
  background: #f3ece1;
  border-color: #d2c2ac;
}
.nav-btn:disabled { opacity: 0.35; cursor: default; }
.nav-btn.next { text-align: right; }
.nav-btn.prev { text-align: left; }

.reader-footer {
  text-align: center;
  color: var(--faint);
  font-size: 13px;
  letter-spacing: 2px;
  margin: 48px auto 0;
  max-width: 680px;
  padding: 24px;
  border-top: 1px solid var(--line);
}

@media (max-width: 520px) {
  .toc-thumb { width: 88px; min-width: 88px; height: 88px; }
  .toc-title { font-size: 19px; }
  .reader-nav { flex-direction: column; }
}