/* ------------------------------------------------------------------ *
 * 网页层：三栏式阅读器（侧边目录 + 正文 + 翻页）。
 * ------------------------------------------------------------------ */

:root {
  --sidebar-w: 19.5rem;
  --topbar-h: 3.4rem;
}

body { overflow-wrap: break-word; }

.read-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  z-index: 90;
  pointer-events: none;
}
#progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-soft));
  transition: width .12s linear;
}

/* ---------------- 顶栏（仅移动端） ---------------- */

.topbar {
  display: none;
  position: sticky;
  top: 0;
  z-index: 70;
  height: var(--topbar-h);
  align-items: center;
  gap: .5rem;
  padding: 0 .9rem;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
}

.topbar-title {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--ink);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: .08em;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  transition: background .18s, color .18s;
}
.icon-btn:hover { background: var(--quote-bg); color: var(--accent); }
.icon-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.icon-lines,
.icon-lines::before,
.icon-lines::after {
  display: block;
  width: 1.05rem;
  height: 1.5px;
  background: currentColor;
  border-radius: 2px;
  transition: transform .2s, opacity .2s;
}
.icon-lines { position: relative; }
.icon-lines::before,
.icon-lines::after { content: ""; position: absolute; left: 0; }
.icon-lines::before { top: -5px; }
.icon-lines::after { top: 5px; }

.theme-dot {
  display: block;
  width: .95rem;
  height: .95rem;
  border-radius: 50%;
  border: 1.5px solid currentColor;
  background: linear-gradient(90deg, currentColor 50%, transparent 50%);
}

/* ---------------- 布局 ---------------- */

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  align-items: start;
}

.sidebar {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  height: 100dvh;
  min-height: 100vh;
  border-right: 1px solid var(--rule);
  background: var(--paper);
  z-index: 60;
}

.sidebar-brand {
  display: flex;
  flex-direction: column;
  gap: .15rem;
  padding: 2rem 1.55rem 1.1rem;
  color: var(--ink);
}
.sidebar-title {
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: .14em;
}
.sidebar-sub {
  font-family: var(--sans);
  font-size: .7rem;
  letter-spacing: .28em;
  color: var(--ink-faint);
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: .35rem .95rem 2rem;
  font-family: var(--sans);
  font-size: .86rem;
  line-height: 1.5;
  scrollbar-width: thin;
  scrollbar-color: var(--rule-strong) transparent;
  overscroll-behavior: contain;
}
.sidebar-nav::-webkit-scrollbar { width: 6px; }
.sidebar-nav::-webkit-scrollbar-thumb { background: var(--rule-strong); border-radius: 3px; }

.nav-cover {
  display: flex;
  align-items: center;
  padding: .5rem .7rem;
  margin-bottom: .2rem;
  border-radius: 6px;
  color: var(--ink-soft);
  font-size: .85rem;
}
.nav-cover:hover { background: var(--quote-bg); color: var(--ink); }
.nav-cover.is-active { color: var(--accent); background: color-mix(in srgb, var(--accent) 9%, transparent); }

.nav-solo { margin-bottom: .3rem; }

.nav-part { margin-top: 1.05rem; }

.nav-part-title {
  display: flex;
  flex-direction: column;
  gap: .1rem;
  padding: .3rem .7rem .35rem;
  border-radius: 6px;
  color: var(--ink);
}
.nav-part-title:hover { background: var(--quote-bg); }
.nav-part-label {
  font-size: .68rem;
  letter-spacing: .2em;
  color: var(--accent);
  font-weight: 600;
}
.nav-part-name {
  font-size: .8rem;
  color: var(--ink-soft);
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.nav-part-title.is-active .nav-part-label { color: var(--accent-soft); }

.nav-list {
  list-style: none;
  margin: .3rem 0 0;
  padding: 0;
}

.nav-item {
  display: flex;
  gap: .55rem;
  padding: .38rem .7rem;
  border-radius: 6px;
  color: var(--ink-soft);
}
.nav-item:hover { background: var(--quote-bg); color: var(--ink); }
.nav-item.is-active {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--accent);
  font-weight: 600;
}
.nav-num {
  flex: none;
  padding-top: .1em;
  font-size: .7rem;
  letter-spacing: .04em;
  color: var(--ink-faint);
  white-space: nowrap;
}
.nav-item.is-active .nav-num { color: var(--accent); }
.nav-name {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.sidebar-foot {
  display: flex;
  align-items: center;
  gap: .1rem;
  padding: .75rem .95rem;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: .78rem;
  color: var(--ink-faint);
}
.sidebar-foot a { color: var(--ink-soft); padding: .2rem .35rem; border-radius: 4px; }
.sidebar-foot a:hover { color: var(--accent); background: var(--quote-bg); }
.sidebar-foot .icon-btn { width: 1.9rem; height: 1.9rem; margin-left: auto; }

.scrim { display: none; }

.main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 4.5rem 2.5rem 5rem;
}

.main > .chapter,
.main > .part-page {
  width: 100%;
  max-width: var(--measure);
}

.main > .home {
  width: 100%;
  max-width: 60rem;
}

/* ---------------- 章节 ---------------- */

.chapter > .kicker { margin-bottom: .9rem; }

.chapter-head {
  margin-bottom: 2.7rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--rule);
}
.chapter-head h1 {
  margin: 0;
  font-size: clamp(1.7rem, 3.3vw, 2.3rem);
  line-height: 1.45;
  letter-spacing: -.005em;
  text-align: left;
}

/* ---------------- 部分首页 ---------------- */

.part-page { padding-top: .5rem; }

.part-label {
  margin: 0 0 1rem;
  font-family: var(--sans);
  font-size: .78rem;
  letter-spacing: .34em;
  color: var(--accent);
}

.part-title {
  margin: 0 0 2.2rem;
  font-size: clamp(1.85rem, 4vw, 2.65rem);
  line-height: 1.35;
  text-align: left;
}

.part-intro { margin-bottom: 2.6rem; }

.part-chapters {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule-strong);
}
.part-chapters a {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1.05rem .25rem;
  border-bottom: 1px solid var(--rule);
  color: var(--ink);
  transition: background .16s, padding-left .16s;
}
.part-chapters a:hover { background: var(--quote-bg); padding-left: .7rem; color: var(--accent); }
.part-ch-num {
  flex: none;
  font-family: var(--sans);
  font-size: .78rem;
  color: var(--accent);
  letter-spacing: .06em;
}
.part-ch-title { flex: 1; line-height: 1.55; }
.part-ch-arrow {
  flex: none;
  color: var(--accent);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity .16s, transform .16s;
}
.part-chapters a:hover .part-ch-arrow { opacity: 1; transform: none; }

/* ---------------- 翻页 ---------------- */

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  width: 100%;
  max-width: var(--measure);
  margin-top: 4.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
}

.pager-card {
  display: flex;
  flex-direction: column;
  gap: .35rem;
  padding: 1rem 1.2rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--paper-raised);
  color: var(--ink);
  transition: border-color .18s, box-shadow .18s, transform .18s;
}
.pager-card:hover {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--rule));
  box-shadow: var(--shadow);
  transform: translateY(-1px);
}
.pager-next { text-align: right; align-items: flex-end; }
.pager-dir {
  font-family: var(--sans);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--accent);
}
.pager-title { font-size: .95rem; line-height: 1.55; }
.pager-card.is-empty { border: 0; background: none; }

.page-foot {
  width: 100%;
  max-width: var(--measure);
  margin-top: 3rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: .76rem;
  letter-spacing: .08em;
  color: var(--ink-faint);
  text-align: center;
}
.page-foot p { margin: .2rem 0; }

/* ---------------- 封面 / 首页 ---------------- */

.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: min(74vh, 660px);
  padding: 2rem 0 3rem;
}
.hero::before {
  content: "";
  position: absolute;
  inset: -4rem -6rem auto;
  height: 34rem;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--accent) 9%, transparent), transparent 72%);
  pointer-events: none;
}
.hero-inner { position: relative; max-width: 42rem; text-align: center; }

.hero-kicker {
  margin: 0 0 1.5rem;
  font-family: var(--sans);
  font-size: .74rem;
  letter-spacing: .5em;
  text-indent: .5em;
  color: var(--accent);
}

.hero-title {
  margin: 0;
  font-size: clamp(2.9rem, 7.5vw, 5rem);
  line-height: 1.12;
  letter-spacing: .07em;
  font-weight: 700;
}

.hero-subtitle {
  margin: 1.3rem 0 0;
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  letter-spacing: .38em;
  text-indent: .38em;
  color: var(--ink-soft);
}

.hero-author {
  margin: .6rem 0 0;
  font-family: var(--sans);
  font-size: .82rem;
  letter-spacing: .2em;
  color: var(--ink-faint);
}

.hero-desc {
  max-width: 32rem;
  margin: 2.1rem auto 2.4rem;
  color: var(--ink-soft);
  font-size: .98rem;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .68em 1.55em;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  background: var(--paper-raised);
  color: var(--ink);
  font-family: var(--sans);
  font-size: .9rem;
  letter-spacing: .06em;
  transition: transform .18s, box-shadow .18s, background .18s, color .18s, border-color .18s;
}
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); color: var(--ink); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fffaf4;
}
.btn-primary:hover { background: var(--accent-soft); border-color: var(--accent-soft); color: #fffaf4; }
.btn-ghost { background: transparent; }

.hero-meta {
  margin-top: 2.2rem;
  font-family: var(--sans);
  font-size: .76rem;
  letter-spacing: .16em;
  color: var(--ink-faint);
}

.resume {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .4rem .7rem;
  margin-top: 1.5rem;
  padding: .5rem 1.05rem;
  border-radius: 999px;
  background: var(--quote-bg);
  font-family: var(--sans);
  font-size: .8rem;
  color: var(--ink-soft);
}
.resume[hidden] { display: none; }
.resume:hover { color: var(--accent); }
.resume-label { color: var(--accent); letter-spacing: .08em; }
.resume-title { max-width: 22rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.catalog {
  margin: 1rem 0 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--rule);
}

.section-title {
  margin: 0 0 2.6rem;
  font-size: 1.4rem;
  letter-spacing: .18em;
  text-align: left;
}
.section-title::after {
  content: "";
  display: block;
  width: 2.6rem;
  height: 2px;
  margin-top: .9rem;
  background: var(--accent);
}

.catalog-solo { margin-bottom: 1.4rem; }
.catalog-solo a {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  padding: .6rem 0;
  border-bottom: 1px solid var(--rule);
  color: var(--ink);
}

.catalog-part { margin-bottom: 2.2rem; }

.catalog-part-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding-bottom: .75rem;
  border-bottom: 1px solid var(--rule-strong);
}
.catalog-part-name { font-size: 1.06rem; font-weight: 700; color: var(--ink); }
.catalog-part-head:hover .catalog-part-name { color: var(--accent); }

.catalog-label {
  flex: none;
  min-width: 5.4em;
  font-family: var(--sans);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--accent);
}

.catalog-chapters {
  list-style: none;
  margin: .2rem 0 0;
  padding: 0;
}
.catalog-chapters a,
.catalog-solo a {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  padding: .58rem .3rem;
  border-bottom: 1px dashed var(--rule);
  color: var(--ink-soft);
  transition: background .16s, color .16s, padding-left .16s;
}
.catalog-chapters a:hover,
.catalog-solo a:hover {
  background: var(--quote-bg);
  padding-left: .8rem;
  color: var(--accent);
}
.catalog-num {
  flex: none;
  min-width: 5.4em;
  font-family: var(--sans);
  font-size: .74rem;
  color: var(--ink-faint);
}
.catalog-title { flex: 1; line-height: 1.6; }

.home-foot {
  margin-top: 2rem;
  padding-top: 1.8rem;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--ink-faint);
  text-align: center;
}
.home-foot p { margin: .25rem 0; }

/* ---------------- 响应式 ---------------- */

@media (max-width: 1080px) {
  :root { --sidebar-w: 17.5rem; }
  .main { padding: 4rem 2rem 4.5rem; }
}

@media (max-width: 900px) {
  .topbar { display: flex; }

  .layout { grid-template-columns: minmax(0, 1fr); }

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(20rem, 86vw);
    height: 100dvh;
    transform: translateX(-102%);
    transition: transform .26s cubic-bezier(.4, 0, .2, 1);
    box-shadow: 0 0 40px rgba(0, 0, 0, .18);
    z-index: 80;
  }
  .sidebar.is-open { transform: none; }

  .scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 75;
    background: rgba(24, 20, 15, .38);
    backdrop-filter: blur(2px);
    opacity: 0;
    transition: opacity .26s;
  }
  .scrim.is-visible { opacity: 1; }
  .scrim[hidden] { display: none; }

  .main { padding: 2rem 1.15rem 3.5rem; }

  .sidebar-brand { padding-top: 1.4rem; }

  .pager { grid-template-columns: 1fr; }
  .pager-next { text-align: left; align-items: flex-start; grid-column: 1; }

  .hero { min-height: auto; padding: 2.5rem 0 2rem; }
  .hero::before { inset: -2rem -1rem auto; }
  .hero-desc { font-size: .94rem; }

  .catalog { padding-top: 2.2rem; }
  .catalog-part-head { flex-direction: column; gap: .25rem; }
  .catalog-chapters a,
  .catalog-solo a { flex-direction: column; gap: .15rem; }
  .catalog-num { padding-top: 0; }

  .prose { font-size: 1.02rem; line-height: 1.92; }
}

@media (max-width: 480px) {
  .hero-actions .btn { flex: 1 1 auto; }
  .chapter-head h1 { font-size: 1.55rem; }
  .prose h3 { font-size: 1.24rem; }
}

body.menu-open { overflow: hidden; }