:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;
  --accent-color: #3b82f6;
  --accent-hover: #2563eb;
  --accent-soft: rgba(59, 130, 246, 0.1);
  --font-serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", "SimSun", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --font-kaiti: "Kaiti SC", "STKaiti", "KaiTi", "楷体", serif;
  --reader-font: var(--font-serif);
  --reader-font-size: 19px;
  --reader-line-height: 1.9;
  --reader-max-width: 780px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* 羊皮纸 / 护眼暖色主题 */
[data-theme="warm"] {
  --bg-primary: #f5eedb;
  --bg-secondary: #fbf5e6;
  --bg-tertiary: #ece2cb;
  --text-primary: #2d241e;
  --text-secondary: #746356;
  --text-muted: #9a887a;
  --border-color: #dfd2b9;
  --accent-color: #b45309;
  --accent-hover: #92400e;
  --accent-soft: rgba(180, 83, 9, 0.12);
}

/* 柔和护眼绿主题 */
[data-theme="green"] {
  --bg-primary: #e6f0e6;
  --bg-secondary: #edf6ed;
  --bg-tertiary: #d8e6d8;
  --text-primary: #192e19;
  --text-secondary: #4d684d;
  --text-muted: #738f73;
  --border-color: #c9dec9;
  --accent-color: #15803d;
  --accent-hover: #166534;
  --accent-soft: rgba(21, 128, 61, 0.12);
}

/* 极夜暗黑主题 */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: #334155;
  --accent-color: #60a5fa;
  --accent-hover: #93c5fd;
  --accent-soft: rgba(96, 165, 250, 0.15);
}

/* OLED 纯黑主题 */
[data-theme="black"] {
  --bg-primary: #000000;
  --bg-secondary: #121212;
  --bg-tertiary: #1e1e1e;
  --text-primary: #d4d4d8;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --border-color: #27272a;
  --accent-color: #38bdf8;
  --accent-hover: #7dd3fc;
  --accent-soft: rgba(56, 189, 248, 0.15);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  transition: background-color 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 顶部阅读进度条 */
#progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(to right, var(--accent-color), #818cf8);
  width: 0%;
  z-index: 100;
  transition: width 0.1s linear;
}

/* 顶部导航栏 */
.navbar {
  position: sticky;
  top: 0;
  background: var(--bg-primary);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 50;
  padding: 0.75rem 1.5rem;
}

.nav-container {
  max-width: var(--reader-max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--text-primary);
  text-decoration: none;
  cursor: pointer;
}

.brand-icon {
  width: 24px;
  height: 24px;
  color: var(--accent-color);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-icon:hover {
  background: var(--bg-tertiary);
  color: var(--accent-color);
  border-color: var(--accent-color);
}

.btn-icon svg {
  width: 18px;
  height: 18px;
}

/* 主容器 */
.main-wrapper {
  max-width: var(--reader-max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 6rem;
}

/* 小说介绍卡片 */
.novel-header-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2.5rem 2rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow-sm);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.novel-badge-group {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.badge {
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  background: var(--accent-soft);
  color: var(--accent-color);
}

.novel-title {
  font-family: var(--font-serif);
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.novel-meta {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.novel-meta span {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.novel-summary {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.8;
  max-width: 600px;
  margin: 0 auto 2rem;
  text-align: justify;
}

.action-bar {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent-color);
  color: #ffffff;
  padding: 0.75rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 9999px;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
  transition: all 0.2s ease;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 9999px;
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-secondary:hover {
  background: var(--border-color);
}

/* 阅读器正文区域 */
.reader-container {
  display: block;
}

.chapter-view {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 3.5rem 3rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow-sm);
}

.chapter-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.75rem;
  margin-bottom: 2.5rem;
  text-align: center;
}

.chapter-subhead {
  font-size: 0.875rem;
  color: var(--accent-color);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.chapter-title {
  font-family: var(--reader-font);
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-primary);
}

.chapter-body {
  font-family: var(--reader-font);
  font-size: var(--reader-font-size);
  line-height: var(--reader-line-height);
  color: var(--text-primary);
  text-align: justify;
}

.chapter-body p {
  text-indent: 2em;
  margin-bottom: 1.5em;
  letter-spacing: 0.02em;
  word-break: break-all;
}

/* 章节翻页控制 */
.chapter-nav-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.chapter-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  border-radius: 10px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 0.9375rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.chapter-nav-btn:hover:not(:disabled) {
  background: var(--accent-color);
  color: #ffffff;
  border-color: var(--accent-color);
}

.chapter-nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* 浮动侧边快捷操作栏 */
.floating-dock {
  position: fixed;
  right: 2rem;
  bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  z-index: 40;
}

.dock-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  transition: all 0.2s ease;
}

.dock-btn:hover {
  transform: scale(1.08);
  background: var(--bg-tertiary);
  color: var(--accent-color);
  border-color: var(--accent-color);
}

.dock-btn svg {
  width: 20px;
  height: 20px;
}

/* 目录抽屉 (Drawer) */
.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 110;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.drawer-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.toc-drawer {
  position: fixed;
  top: 0;
  left: 0;
  width: 360px;
  max-width: 85vw;
  height: 100vh;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  z-index: 120;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-xl);
}

.toc-drawer.active {
  transform: translateX(0);
}

.drawer-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer-title {
  font-size: 1.125rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toc-search-box {
  padding: 0.75rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

.toc-search-input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 0.875rem;
  outline: none;
}

.toc-search-input:focus {
  border-color: var(--accent-color);
}

.toc-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem 0;
  list-style: none;
}

.toc-item {
  padding: 0.875rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: all 0.15s ease;
  font-size: 0.9375rem;
  color: var(--text-secondary);
}

.toc-item:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.toc-item.active {
  background: var(--accent-soft);
  color: var(--accent-color);
  border-left-color: var(--accent-color);
  font-weight: 600;
}

/* 排版设置弹窗 (Modal) */
.settings-modal {
  position: fixed;
  bottom: 5.5rem;
  right: 2rem;
  width: 320px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: var(--shadow-xl);
  z-index: 100;
  opacity: 0;
  transform: translateY(10px) scale(0.95);
  pointer-events: none;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.settings-modal.active {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.setting-group {
  margin-bottom: 1.25rem;
}

.setting-group:last-child {
  margin-bottom: 0;
}

.setting-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  display: block;
}

.theme-options {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
}

.theme-btn {
  height: 36px;
  border-radius: 8px;
  border: 2px solid transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 600;
  transition: all 0.15s;
}

.theme-btn.active {
  border-color: var(--accent-color);
}

.theme-btn[data-theme-val="light"] { background: #ffffff; color: #1e293b; border: 1px solid #cbd5e1; }
.theme-btn[data-theme-val="warm"] { background: #f5eedb; color: #2d241e; border: 1px solid #dfd2b9; }
.theme-btn[data-theme-val="green"] { background: #e6f0e6; color: #192e19; border: 1px solid #c9dec9; }
.theme-btn[data-theme-val="dark"] { background: #0f172a; color: #f8fafc; border: 1px solid #334155; }

.font-size-control {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-tertiary);
  border-radius: 8px;
  padding: 0.25rem;
}

.font-size-btn {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  border: none;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-weight: bold;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.font-family-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.5rem;
}

.font-family-btn {
  padding: 0.4rem 0.2rem;
  border-radius: 6px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  font-size: 0.8125rem;
  cursor: pointer;
  text-align: center;
}

.font-family-btn.active {
  background: var(--accent-color);
  color: #ffffff;
  border-color: var(--accent-color);
}

/* 移动端适配 */
@media (max-width: 640px) {
  .main-wrapper {
    padding: 1rem 1rem 5rem;
  }
  .novel-header-card {
    padding: 1.75rem 1.25rem;
  }
  .novel-title {
    font-size: 1.75rem;
  }
  .chapter-view {
    padding: 2rem 1.25rem;
  }
  .chapter-title {
    font-size: 1.4rem;
  }
  .floating-dock {
    right: 1rem;
    bottom: 1rem;
  }
  .settings-modal {
    right: 1rem;
    left: 1rem;
    bottom: 4.5rem;
    width: auto;
  }
}