:root {
  --bg: #f4eee3;
  --panel: rgba(253, 247, 235, 0.94);
  --panel-2: #f7edd9;
  --text: #2e2418;
  --muted: #7a664c;
  --accent: #8a2f2f;
  --line: #d4c5ac;
  --shadow: 0 10px 28px rgba(85, 57, 23, 0.15);
}

:root[data-theme='night'] {
  --bg: #11141b;
  --panel: rgba(22, 26, 35, 0.95);
  --panel-2: #1e2532;
  --text: #edf0f7;
  --muted: #aab3c7;
  --accent: #f5b24f;
  --line: #323c50;
  --shadow: 0 14px 34px rgba(0, 0, 0, 0.45);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', serif;
  color: var(--text);
  background: radial-gradient(circle at 0% 0%, rgba(138, 47, 47, 0.1), transparent 36%),
    radial-gradient(circle at 100% 0%, rgba(130, 98, 52, 0.1), transparent 34%), var(--bg);
}

.bg {
  position: fixed;
  inset: 0;
  background-image: linear-gradient(125deg, rgba(0, 0, 0, 0.02), transparent 30%),
    repeating-linear-gradient(
      0deg,
      rgba(90, 65, 35, 0.03) 0,
      rgba(90, 65, 35, 0.03) 1px,
      transparent 1px,
      transparent 6px
    );
  pointer-events: none;
}

.topbar {
  position: relative;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--panel) 88%, transparent);
}

.title-wrap h1 {
  margin: 0;
  font-size: 1.24rem;
  letter-spacing: 0.08em;
}

.title-wrap p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
}

.tool-btn {
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 10px;
  padding: 9px 12px;
  cursor: pointer;
}

.search-wrap {
  min-width: min(380px, 46vw);
}

#searchInput {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 14px;
  background: var(--panel);
  color: var(--text);
}

.layout {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  gap: 16px;
  padding: 16px;
  max-width: 1460px;
  margin: 0 auto;
}

.sidebar,
.reader {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.sidebar {
  overflow: auto;
  max-height: calc(100vh - 104px);
}

.series {
  border-bottom: 1px solid var(--line);
}

.series-title {
  margin: 0;
  padding: 12px 14px;
  color: var(--accent);
  font-size: 0.92rem;
  border-bottom: 1px dashed var(--line);
}

.chapter-list {
  list-style: none;
  margin: 0;
  padding: 6px;
}

.chapter-btn {
  width: 100%;
  text-align: left;
  border: 1px solid transparent;
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  padding: 9px 10px;
  cursor: pointer;
}

.chapter-btn:hover {
  background: var(--panel-2);
}

.chapter-btn.active {
  border-color: color-mix(in srgb, var(--accent) 50%, transparent);
  background: color-mix(in srgb, var(--accent) 14%, transparent);
}

.chapter-btn.read::after {
  content: ' ✓';
  color: color-mix(in srgb, var(--accent) 75%, white 5%);
}

.reader {
  position: relative;
  overflow: auto;
  max-height: calc(100vh - 104px);
}

.chapter-progress-bar {
  position: sticky;
  top: 0;
  z-index: 8;
  height: 3px;
  background: transparent;
}

#chapterProgressFill {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), color-mix(in srgb, var(--accent) 55%, #f6dba7));
}

.progress-row {
  position: sticky;
  top: 3px;
  z-index: 7;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 18px 8px;
  color: var(--muted);
  font-size: 0.9rem;
  background: color-mix(in srgb, var(--panel) 94%, transparent);
  border-bottom: 1px solid var(--line);
}

.markdown-body {
  width: min(860px, 92%);
  margin: 24px auto 50px;
  font-size: 1.08rem;
  line-height: 1.95;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  line-height: 1.35;
  margin-top: 1.8em;
}

.markdown-body h1 {
  margin-top: 0.3em;
}

.markdown-body p {
  white-space: pre-wrap;
}

.markdown-body blockquote {
  margin: 1.2em 0;
  padding-left: 1em;
  border-left: 3px solid color-mix(in srgb, var(--accent) 55%, #5d6dff);
  color: color-mix(in srgb, var(--text) 90%, var(--muted));
}

.markdown-body code {
  background: color-mix(in srgb, var(--panel-2) 85%, #10141d);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 2px 5px;
}

.empty {
  padding: 20px;
  color: var(--muted);
}

.chapter-nav {
  position: sticky;
  bottom: 0;
  z-index: 10;
  display: flex;
  gap: 10px;
  justify-content: center;
  padding: 10px 14px 14px;
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 96%, transparent);
}

.nav-btn {
  min-width: 120px;
}

.nav-btn[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
}

@media (max-width: 980px) {
  .layout {
    grid-template-columns: 1fr;
    padding: 10px;
  }

  .topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .toolbar {
    flex-wrap: wrap;
  }

  .search-wrap {
    min-width: 100%;
  }

  .sidebar {
    position: fixed;
    z-index: 40;
    left: 10px;
    right: 10px;
    top: 76px;
    max-height: calc(100vh - 88px);
    transform: translateY(8px) scale(0.99);
    opacity: 0;
    pointer-events: none;
    transition: all 0.2s ease;
  }

  body.toc-open .sidebar {
    transform: translateY(0) scale(1);
    opacity: 1;
    pointer-events: auto;
  }

  .reader {
    max-height: none;
    min-height: calc(100vh - 132px);
  }

  .chapter-nav {
    position: fixed;
    left: 10px;
    right: 10px;
    bottom: 8px;
    border-radius: 12px;
    box-shadow: var(--shadow);
  }

  .markdown-body {
    margin-bottom: 84px;
  }
}