/* ===== 设计系统 ===== */
:root {
  --paper: #f7f3eb;
  --ink: #1f1c18;
  --ink-soft: #5c554c;
  --rule: #d8d0c4;
  --accent: #8b3a2f;
  --accent-soft: #b85c4f;
  --surface: #fffdf8;
  --shadow: 0 1px 3px rgba(31, 28, 24, .06);
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-ui: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --measure: 42rem;
}

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

body {
  font-family: var(--font-serif);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  transition: background .25s, color .25s;
}

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

/* ===== 顶部导航 ===== */
.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 10;
}

.header-inner {
  max-width: 72rem;
  margin: 0 auto;
  padding: .9rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.brand {
  font-size: 1.05rem;
  letter-spacing: .18em;
  font-weight: 600;
}

.nav {
  display: flex;
  gap: 1.6rem;
  font-family: var(--font-ui);
  font-size: .85rem;
  color: var(--ink-soft);
}

.nav a:hover { color: var(--accent); }

/* ===== 按钮 ===== */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-ui);
  font-size: .88rem;
  padding: .7rem 1.4rem;
  letter-spacing: .04em;
  transition: background .2s;
}
.btn-primary:hover { background: var(--accent-soft); }

.btn-ghost {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: .88rem;
  color: var(--ink-soft);
  padding: .7rem 0;
  margin-left: 1.2rem;
  border-bottom: 1px solid var(--rule);
}
.btn-ghost:hover { color: var(--accent); border-color: var(--accent); }

.btn-text {
  font-family: var(--font-ui);
  font-size: .84rem;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--rule);
}
.btn-text:hover { color: var(--accent); border-color: var(--accent); }

/* ===== 首页 hero ===== */
.hero {
  max-width: 72rem;
  margin: 0 auto;
  padding: 4rem 1.5rem 3rem;
  display: grid;
  grid-template-columns: 1fr 20rem;
  gap: 4rem;
  align-items: start;
}

.eyebrow {
  font-family: var(--font-ui);
  font-size: .75rem;
  letter-spacing: .2em;
  color: var(--ink-soft);
  margin-bottom: 1.2rem;
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: .02em;
  margin-bottom: 1.4rem;
}

.lead {
  color: var(--ink-soft);
  font-size: 1.02rem;
  max-width: 34rem;
  margin-bottom: 2rem;
}

.hero-card {
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: 1.6rem;
  box-shadow: var(--shadow);
  position: sticky;
  top: 5.5rem;
}

.card-label {
  font-family: var(--font-ui);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--accent);
  margin-bottom: .6rem;
}

.hero-card h3 { font-size: 1.3rem; margin-bottom: .3rem; }

.card-meta {
  font-family: var(--font-ui);
  font-size: .78rem;
  color: var(--ink-soft);
  margin-bottom: 1.2rem;
}

.progress-track {
  height: 3px;
  background: var(--rule);
  margin-bottom: .6rem;
  overflow: hidden;
}
.progress-track span {
  display: block;
  height: 100%;
  background: var(--accent);
}

.progress-caption {
  font-family: var(--font-ui);
  font-size: .75rem;
  color: var(--ink-soft);
  margin-bottom: 1rem;
}

.card-link {
  font-family: var(--font-ui);
  font-size: .82rem;
  color: var(--accent);
}

/* ===== 首页生平 ===== */
.bio {
  max-width: 72rem;
  margin: 0 auto;
  padding: 2rem 1.5rem 5rem;
}
.bio-inner { max-width: var(--measure); }

.bio h2 {
  font-size: 1.1rem;
  letter-spacing: .12em;
  font-family: var(--font-ui);
  font-weight: 500;
  color: var(--ink-soft);
  margin-bottom: 1.6rem;
  padding-bottom: .6rem;
  border-bottom: 1px solid var(--rule);
}

.bio p {
  margin-bottom: 1.2rem;
  font-size: 1.02rem;
}

.drop-cap::first-letter {
  float: left;
  font-size: 3.2rem;
  line-height: .85;
  padding-right: .35rem;
  padding-top: .1rem;
  font-weight: 700;
  color: var(--accent);
}

/* ===== 书籍介绍页 ===== */
.book-layout {
  max-width: 72rem;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 20rem;
  gap: 3.5rem;
  align-items: start;
}

.book-kicker {
  font-family: var(--font-ui);
  font-size: .75rem;
  letter-spacing: .16em;
  color: var(--accent);
  margin-bottom: .8rem;
}

.book-header h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  letter-spacing: .04em;
  margin-bottom: 1rem;
}

.book-deck {
  font-size: 1.05rem;
  color: var(--ink-soft);
  max-width: 36rem;
  margin-bottom: 1.6rem;
}

.book-actions {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  margin-bottom: 2.8rem;
}

.book-block { margin-bottom: 2.4rem; }

.book-block h2 {
  font-family: var(--font-ui);
  font-size: .78rem;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--ink-soft);
  margin-bottom: .8rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--rule);
}

.book-block p {
  font-size: 1.02rem;
  margin-bottom: 1rem;
  max-width: var(--measure);
}

.book-aside {
  position: sticky;
  top: 5.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.aside-card {
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: 1.3rem 1.4rem;
  box-shadow: var(--shadow);
}

.aside-card h3 {
  font-family: var(--font-ui);
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .14em;
  color: var(--ink-soft);
  margin-bottom: 1rem;
}

.meta-list div {
  display: flex;
  justify-content: space-between;
  font-size: .9rem;
  padding: .35rem 0;
  border-bottom: 1px solid var(--rule);
}
.meta-list div:last-child { border-bottom: none; }
.meta-list dt {
  color: var(--ink-soft);
  font-family: var(--font-ui);
  font-size: .8rem;
}

.chapter-list {
  list-style: none;
  counter-reset: ch;
}
.chapter-list li {
  counter-increment: ch;
  padding: .35rem 0;
}
.chapter-list a {
  font-size: .92rem;
  color: var(--ink);
  display: flex;
  gap: .6rem;
}
.chapter-list a::before {
  content: counter(ch, decimal-leading-zero);
  font-family: var(--font-ui);
  font-size: .68rem;
  color: var(--ink-soft);
  padding-top: .2rem;
}
.chapter-list a:hover { color: var(--accent); }

/* ===== 阅读页 ===== */
.reader-bar {
  max-width: 64rem;
  margin: 0 auto;
  padding: .8rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--font-ui);
  font-size: .8rem;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--rule);
}

.reader-back { white-space: nowrap; }
.reader-back:hover { color: var(--accent); }

.reader-title {
  flex: 1;
  text-align: center;
  letter-spacing: .06em;
}

.reader-tools { display: flex; gap: .3rem; }

.reader-tools button {
  background: transparent;
  border: 1px solid var(--rule);
  color: var(--ink-soft);
  font-family: var(--font-ui);
  font-size: .72rem;
  padding: .3rem .55rem;
  cursor: pointer;
  transition: all .15s;
}
.reader-tools button:hover,
.reader-tools button.active {
  border-color: var(--accent);
  color: var(--accent);
}

.reader-article {
  max-width: 56rem;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

.reader-header {
  text-align: center;
  margin-bottom: 3rem;
}

.reader-book {
  font-family: var(--font-ui);
  font-size: .72rem;
  letter-spacing: .18em;
  color: var(--accent);
  margin-bottom: .8rem;
}

.reader-header h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  letter-spacing: .08em;
  font-weight: 600;
}

.reader-body {
  max-width: var(--measure);
  margin: 0 auto;
  font-size: 1.08rem;
  line-height: 2.1;
}

.reader-body p {
  margin-bottom: 1.4em;
  text-indent: 2em;
  text-align: justify;
}

.reader-footer {
  max-width: var(--measure);
  margin: 3rem auto 0;
}

.reader-pager {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--rule);
  padding-top: 1.6rem;
  font-family: var(--font-ui);
  font-size: .85rem;
}

.pager-prev, .pager-next { color: var(--ink-soft); }
.pager-prev:hover, .pager-next:hover { color: var(--accent); }

.pager-toc {
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: .35rem 1rem;
}

.reader-progress {
  text-align: center;
  margin-top: 1rem;
  font-family: var(--font-ui);
  font-size: .72rem;
  color: var(--ink-soft);
}
/* 书籍列表页 */
.library-hero {
  max-width: 72rem; margin: 0 auto;
  padding: 3.5rem 1.5rem 2rem;
}
.library-hero h1 { font-size: clamp(2rem, 4vw, 2.8rem); ... }
.library-hero .lead { ... }

.book-grid {
  max-width: 72rem; margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: 1.2rem;
}

.book-card {
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: 1.4rem;
  box-shadow: var(--shadow);
  display: flex; flex-direction: column;
  transition: border-color .2s, transform .2s;
  position: relative;
}
.book-card:hover { border-color: var(--accent); transform: translateY(-2px); }

.book-card .year { font-family: var(--font-ui); font-size: .7rem; letter-spacing: .12em; color: var(--accent); }
.book-card h3 { font-size: 1.15rem; margin: .5rem 0 .6rem; letter-spacing: .02em; }
.book-card p { font-size: .86rem; color: var(--ink-soft); line-height: 1.7; flex: 1; }

/* ===== 补全新模板中标记为 ... 的规则 ===== */
.library-hero h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  letter-spacing: .04em;
  margin-bottom: .8rem;
}
.library-hero .lead {
  color: var(--ink-soft);
  font-size: 1.02rem;
  max-width: 34rem;
  margin-bottom: 1rem;
}

/* ===== 阅读页主题（覆盖 CSS 变量，全部样式自动跟随） ===== */
body.theme-sepia {
  --paper: #efe6d3;
  --ink: #4a3f2f;
  --ink-soft: #6d5f4b;
  --rule: #d3c8b3;
  --surface: #f6efe1;
}
body.theme-night {
  --paper: #181818;
  --ink: #c9c4bd;
  --ink-soft: #8a8681;
  --rule: #333;
  --surface: #232323;
}
body.theme-night .reader-tools button { color: #c9c4bd; }

/* ===== 首页搜索栏 ===== */
.search-bar {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 1.5rem 1rem;
  display: flex;
  align-items: center;
  gap: .8rem;
  flex-wrap: wrap;
}

.search-input-wrap {
  position: relative;
  flex: 1;
  max-width: 26rem;
  min-width: 12rem;
}

.search-input-wrap input {
  width: 100%;
  font-family: var(--font-ui);
  font-size: .9rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: .55rem 2.2rem .55rem .9rem;
  outline: none;
  transition: border-color .2s, box-shadow .2s;
  -webkit-appearance: none;
  appearance: none;
}
.search-input-wrap input:focus {
  border-color: var(--accent);
}
.search-input-wrap input::placeholder {
  color: var(--ink-soft);
  opacity: .7;
}
/* 隐藏 type=search 的原生清除按钮（我们自己实现） */
.search-input-wrap input::-webkit-search-cancel-button { display: none; }

.search-clear {
  position: absolute;
  right: .4rem;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  border: none;
  color: var(--ink-soft);
  font-size: 1.15rem;
  line-height: 1;
  padding: .1rem .4rem;
  cursor: pointer;
  transition: color .15s;
}
.search-clear:hover { color: var(--accent); }

.search-count {
  font-family: var(--font-ui);
  font-size: .78rem;
  color: var(--ink-soft);
  white-space: nowrap;
}

.search-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3rem 1rem;
  color: var(--ink-soft);
  font-family: var(--font-ui);
  font-size: .9rem;
}

@media (max-width: 768px) {
  .search-input-wrap { max-width: none; flex-basis: 100%; }
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .book-layout { grid-template-columns: 1fr; }
  .book-aside { position: static; }
}

@media (max-width: 768px) {
  .hero { grid-template-columns: 1fr; gap: 2rem; padding-top: 2.5rem; }
  .hero-card { position: static; }
  .header-inner { gap: 1rem; padding: .8rem 1.2rem; }
  .nav { gap: 1rem; font-size: .78rem; overflow-x: auto; }
  .reader-bar { flex-wrap: wrap; gap: .5rem; }
  .reader-title { flex: 1 0 100%; text-align: left; order: 3; }
}