/* ==========================================================
   漫漫漫画 · 整站样式表
   站点：beijingchengkao.com
   说明：本文件为全站唯一样式表，覆盖首页、书架、题材、
         人气榜、更新日历、阅读指南、版权反馈、404 页面。
   分组：base / layout / components / pages / responsive
   ========================================================== */

/* ==========================================================
   1. Base —— 基础变量、重置、全局字体与颜色
   ========================================================== */

:root {
  --color-page-bg: #F5F6F8;
  --color-card: #FFFFFF;
  --color-text: #1F2430;
  --color-text-light: #5A6474;
  --color-accent: #D97706;
  --color-accent-hover: #B35F04;
  --color-info: #3B5BDB;
  --color-info-light: #EEF1FC;
  --color-border: #E5E7EB;
  --color-tag-bg: #F1F2F5;
  --color-danger: #C0392B;

  --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --container-width: 1280px;
  --content-width: 1280px;

  --header-height: 72px;
  --space-section: 48px;
  --space-block: 24px;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-page-bg);
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-info);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.35;
  font-weight: 700;
  color: var(--color-text);
}

h1 {
  font-size: 28px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  line-height: 1.7;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================
   2. Layout —— 全站布局骨架、容器、页头、页脚
   ========================================================== */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-page-bg);
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

/* --- 页头 --- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 4px rgba(31, 36, 48, 0.04);
}

.header-shell {
  width: 100%;
  max-width: var(--container-width);
  height: var(--header-height);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-logo {
  font-size: 24px;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.brand-logo:hover {
  color: var(--color-accent);
}

.site-nav .nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav .nav-list li a {
  display: block;
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.site-nav .nav-list li a:hover {
  color: var(--color-accent);
  background-color: #F8F9FB;
}

.site-nav .nav-list li a.is-current {
  color: var(--color-accent);
  background-color: #FDF1E3;
  font-weight: 600;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: none;
  background: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

/* --- 页脚 --- */

.site-footer {
  flex-shrink: 0;
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
  margin-top: 48px;
}

.footer-shell {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 36px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.footer-brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.footer-nav a {
  font-size: 14px;
  color: var(--color-text-light);
}

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

.copyright-line {
  flex-basis: 100%;
  font-size: 13px;
  color: #8B93A3;
  text-align: center;
  margin-top: 8px;
}

/* --- 内页骨架 --- */

.inner-main {
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 24px 24px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 20px;
  padding-bottom: 4px;
  font-size: 14px;
  color: var(--color-text-light);
}

.breadcrumb a {
  color: var(--color-info);
}

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

.breadcrumb-sep {
  color: #B0B7C3;
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
}

.page-header {
  padding: 24px 0 28px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 32px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}

.page-description {
  max-width: 760px;
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
}

.section-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 20px;
}

.section-heading {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 16px;
}

.section-intro {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 720px;
}

.section-lead {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 720px;
}

/* ==========================================================
   3. Components —— 通用组件：标签、卡片、按钮、榜单
   ========================================================== */

/* --- 标签 --- */

.tag-status,
.tag-genre,
.batch-tag,
.status-label {
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.5;
  border-radius: 999px;
  white-space: nowrap;
}

.tag-status {
  background-color: var(--color-info-light);
  color: var(--color-info);
}

.tag-genre {
  background-color: var(--color-tag-bg);
  color: var(--color-text-light);
}

.batch-tag {
  background-color: #FDF1E3;
  color: var(--color-accent);
}

.status-label {
  background-color: var(--color-info-light);
  color: var(--color-info);
}

/* --- 通用按钮 --- */

.cta-button,
.guide-link,
.more-link,
.error-back {
  display: inline-block;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-card);
  background-color: var(--color-accent);
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease, transform 0.2s ease;
  text-align: center;
}

.cta-button:hover,
.guide-link:hover,
.more-link:hover,
.error-back:hover {
  background-color: var(--color-accent-hover);
  color: var(--color-card);
  transform: translateY(-1px);
}

.more-link {
  padding: 8px 18px;
  font-size: 14px;
  background-color: transparent;
  color: var(--color-info);
  border: 1px solid var(--color-border);
}

.more-link:hover {
  background-color: var(--color-info-light);
  color: var(--color-info);
  border-color: transparent;
}

/* --- 封面卡（通用） --- */

.express-card,
.focus-card,
.book-card,
.sample-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.express-card:hover,
.focus-card:hover,
.book-card:hover,
.sample-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(31, 36, 48, 0.08);
}

/* ==========================================================
   4. Pages —— 首页
   ========================================================== */

.home-main {
  width: 100%;
}

/* --- 首屏视觉 --- */

.hero-visual {
  width: 100%;
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-border);
}

.hero-figure {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 28px 24px 32px;
}

.hero-figure img {
  width: 100%;
  height: auto;
  max-height: 420px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.hero-figure figcaption {
  margin-top: 12px;
  font-size: 14px;
  color: var(--color-text-light);
  text-align: center;
}

/* --- 更新速递 --- */

.update-express {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 8px;
}

.update-express h1 {
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}

.express-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.express-card {
  display: flex;
  flex-direction: column;
}

.express-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.card-body {
  padding: 16px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.card-body h3 {
  font-size: 17px;
  font-weight: 600;
}

.card-body p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  flex: 1;
}

.card-body .status-label {
  align-self: flex-start;
}

/* --- 人气焦点 --- */

.popular-focus {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 8px;
}

.focus-layout {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 24px;
  align-items: start;
}

.focus-main h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 16px;
}

.focus-card {
  display: flex;
  flex-direction: column;
}

.focus-card img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.focus-card h3 {
  padding: 16px 18px 4px;
  font-size: 18px;
  font-weight: 600;
}

.focus-card p {
  padding: 0 18px 8px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.focus-card a {
  margin: 0 18px 18px;
  align-self: flex-start;
}

.popular-list {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
}

.popular-list h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.rank-summary {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.rank-summary li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 8px;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

.rank-summary li:hover {
  background-color: #F8F9FB;
}

.rank-num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-accent);
  background-color: #FDF1E3;
  border-radius: var(--radius-sm);
  font-variant-numeric: tabular-nums;
}

.rank-summary li:nth-child(1) .rank-num {
  background-color: var(--color-accent);
  color: #fff;
}

.rank-summary li:nth-child(2) .rank-num {
  background-color: #F0E6D2;
  color: #8A6A2F;
}

.rank-summary li:nth-child(3) .rank-num {
  background-color: #E8E0D0;
  color: #7A6A4F;
}

.rank-summary li a {
  flex: 1;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rank-summary li a:hover {
  color: var(--color-accent);
}

.trend {
  flex-shrink: 0;
  font-size: 13px;
  color: var(--color-text-light);
  font-variant-numeric: tabular-nums;
}

.popular-list .more-link {
  margin-top: 12px;
  width: 100%;
  text-align: center;
}

/* --- 题材索引条 --- */

.genre-index {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 8px;
}

.genre-index h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 16px;
}

.genre-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.genre-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: border-color 0.2s ease, color 0.2s ease, background-color 0.2s ease;
}

.genre-tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: #FDF1E3;
}

.genre-tag .count {
  font-size: 12px;
  color: var(--color-text-light);
  font-variant-numeric: tabular-nums;
}

/* --- 追更日历预告 --- */

.calendar-teaser {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 8px;
}

.calendar-teaser h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
}

.calendar-teaser p {
  max-width: 720px;
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 16px;
}

/* --- 新手上路 --- */

.get-started {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 8px;
}

.get-started h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
}

.steps-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.step-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.step-card:hover {
  box-shadow: 0 8px 20px rgba(31, 36, 48, 0.06);
  transform: translateY(-2px);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-accent);
  background-color: #FDF1E3;
  border-radius: var(--radius-sm);
  margin-bottom: 4px;
}

.step-card h3 {
  font-size: 17px;
  font-weight: 600;
}

.step-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  flex: 1;
}

.step-card a {
  font-size: 14px;
  font-weight: 500;
  align-self: flex-start;
}

.get-started .guide-link {
  margin-top: 24px;
}

/* --- 版权与反馈 --- */

.copyright-feedback {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 8px;
}

.copyright-feedback h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
}

.copyright-feedback p {
  max-width: 760px;
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 20px;
}

.feedback-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.feedback-links a {
  display: inline-block;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-info);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.feedback-links a:hover {
  border-color: var(--color-info);
  background-color: var(--color-info-light);
  color: var(--color-info);
}

/* ==========================================================
   5. Pages —— 书架页
   ========================================================== */

/* --- 状态筛选条 --- */

.status-filter {
  margin-bottom: 32px;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 12px;
}

.filter-btn {
  display: inline-block;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  min-height: 44px;
  line-height: 1.4;
}

.filter-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.filter-btn.is-active {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  font-weight: 600;
}

.filter-note {
  font-size: 14px;
  color: var(--color-text-light);
}

/* --- 书架封面网格 --- */

.book-shelf {
  margin-bottom: 40px;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}

.book-card {
  display: flex;
  flex-direction: column;
}

.book-card > a {
  display: flex;
  flex-direction: column;
  height: 100%;
  color: var(--color-text);
}

.book-card > a:hover {
  color: var(--color-text);
}

.book-cover {
  width: 100%;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background-color: var(--color-tag-bg);
}

.book-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.book-card:hover .book-cover img {
  transform: scale(1.04);
}

.book-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 12px 12px 0;
}

.book-title {
  padding: 6px 12px 0;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
}

.book-update {
  padding: 4px 12px 14px;
  font-size: 13px;
  color: var(--color-text-light);
}

/* --- 底部导航 --- */

.bottom-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding: 28px 0 8px;
  border-top: 1px solid var(--color-border);
}

.entry-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 22px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.entry-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(31, 36, 48, 0.06);
}

.entry-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
}

.entry-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ==========================================================
   6. Pages —— 题材分类页
   ========================================================== */

.layout-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
  align-items: start;
}

/* --- 左栏题材索引 --- */

.category-index {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.aside-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.index-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.index-item {
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

.index-item:hover {
  background-color: #F8F9FB;
}

.index-item a {
  display: block;
  padding: 10px 12px 2px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
}

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

.index-desc {
  display: block;
  padding: 0 12px 8px;
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* --- 右栏题材内容 --- */

.category-main {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.category-section {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.section-head {
  margin-bottom: 16px;
}

.section-head .section-title {
  margin-bottom: 6px;
}

.section-head .section-desc {
  margin-bottom: 0;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.tag-item {
  display: inline-block;
  padding: 4px 12px;
  font-size: 13px;
  color: var(--color-text-light);
  background-color: var(--color-tag-bg);
  border-radius: 999px;
}

.sample-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.sample-card {
  display: flex;
  flex-direction: column;
}

.sample-figure {
  width: 100%;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  background-color: var(--color-tag-bg);
}

.sample-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.sample-card:hover .sample-figure img {
  transform: scale(1.04);
}

.sample-meta {
  padding: 10px 12px 12px;
  font-size: 13px;
  color: var(--color-text-light);
}

/* --- 分类页底部链接 --- */

.category-links {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.link-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.text-link {
  display: inline-block;
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-info);
  background-color: var(--color-info-light);
  border-radius: 999px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.text-link:hover {
  background-color: var(--color-info);
  color: #fff;
}

/* ==========================================================
   7. Pages —— 人气榜页
   ========================================================== */

.rank-section {
  margin-bottom: 40px;
}

.rank-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.rank-item {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 16px 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.rank-item:hover {
  background-color: #F8F9FB;
  box-shadow: 0 4px 12px rgba(31, 36, 48, 0.05);
}

.rank-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text-light);
  background-color: var(--color-tag-bg);
  border-radius: var(--radius-sm);
  font-variant-numeric: tabular-nums;
}

.rank-item:nth-child(1) .rank-number {
  background-color: var(--color-accent);
  color: #fff;
}

.rank-item:nth-child(2) .rank-number {
  background-color: #F0E6D2;
  color: #8A6A2F;
}

.rank-item:nth-child(3) .rank-number {
  background-color: #E8E0D0;
  color: #7A6A4F;
}

.rank-cover {
  flex-shrink: 0;
  width: 72px;
  height: 96px;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background-color: var(--color-tag-bg);
}

.rank-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.rank-info {
  flex: 1;
  min-width: 0;
}

.rank-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 4px;
}

.rank-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 6px;
}

.rank-meta .tag {
  display: inline-block;
  padding: 2px 10px;
  font-size: 12px;
  font-weight: 500;
  border-radius: 999px;
}

.rank-meta .tag-status {
  background-color: var(--color-info-light);
  color: var(--color-info);
}

.rank-meta .tag-genre {
  background-color: var(--color-tag-bg);
  color: var(--color-text-light);
}

.rank-reason {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* --- 榜外阅读入口 --- */

.rank-entry-section {
  padding-top: 8px;
  border-top: 1px solid var(--color-border);
}

.entry-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 16px;
}

.entry-card h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
}

.entry-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.entry-link {
  display: inline-block;
  margin-top: 8px;
  font-size: 14px;
  font-weight: 600;
}

.entry-tip {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ==========================================================
   8. Pages —— 更新日历页
   ========================================================== */

.update-calendar-section {
  margin-bottom: 40px;
}

.update-calendar-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.calendar-day-group {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  scroll-margin-top: calc(var(--header-height) + 20px);
}

.calendar-day-label {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border);
}

.calendar-day-items {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.update-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

.update-item:hover {
  background-color: #F8F9FB;
}

.update-thumb {
  flex-shrink: 0;
  width: 56px;
  height: 72px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background-color: var(--color-tag-bg);
}

.update-info {
  flex: 1;
  min-width: 0;
}

.update-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.update-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.5;
}

.update-tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: 12px;
  color: var(--color-info);
  background-color: var(--color-info-light);
  border-radius: 999px;
  margin-top: 4px;
}

.tag-continue {
  display: inline-block;
  padding: 2px 8px;
  font-size: 12px;
  color: var(--color-accent);
  background-color: #FDF1E3;
  border-radius: 999px;
  margin-top: 4px;
}

/* --- 追更说明 --- */

.tracking-note-section {
  margin-bottom: 40px;
}

.tracking-note-box {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-md);
  padding: 24px 28px;
}

.tracking-note-box p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

.tracking-note-box p:last-child {
  margin-bottom: 0;
}

/* --- 相关链接 --- */

.related-links-section {
  padding-top: 8px;
}

.related-links-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.related-link-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.related-link-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(31, 36, 48, 0.06);
}

.related-link-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
}

.related-link-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* ==========================================================
   9. Pages —— 阅读指南页
   ========================================================== */

.guide-layout {
  display: flex;
  flex-direction: column;
  gap: 48px;
}

/* --- 上手流程 --- */

.guide-steps {
  margin-bottom: 8px;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.guide-steps .step-card {
  padding: 0;
  overflow: hidden;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-size: 18px;
  font-weight: 700;
  color: var(--color-accent);
  background-color: #FDF1E3;
  border-radius: var(--radius-sm);
  margin: 20px 20px 0;
}

.step-media {
  margin: 16px 20px 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--color-tag-bg);
}

.step-media img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.guide-steps .step-title {
  padding: 14px 20px 0;
  font-size: 17px;
  font-weight: 600;
}

.guide-steps .step-desc {
  padding: 0 20px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.guide-steps .step-desc a {
  font-size: 14px;
  font-weight: 500;
}

.guide-steps .step-link {
  display: inline-block;
  margin: 10px 20px 20px;
  font-size: 14px;
  font-weight: 600;
}

/* --- 栏目地图 --- */

.guide-map {
  margin-bottom: 8px;
}

.map-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.map-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.map-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(31, 36, 48, 0.06);
}

.map-title {
  font-size: 17px;
  font-weight: 600;
}

.map-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  flex: 1;
}

.map-link {
  font-size: 14px;
  font-weight: 600;
  align-self: flex-start;
}

/* --- FAQ --- */

.guide-faq {
  margin-bottom: 8px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 44px;
  transition: background-color 0.2s ease;
}

.faq-item summary:hover {
  background-color: #F8F9FB;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: var(--color-accent);
  font-weight: 400;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* --- 下一步 --- */

.guide-next {
  margin-bottom: 8px;
}

.next-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.next-link-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 24px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.next-link-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(31, 36, 48, 0.06);
}

.next-link-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
}

.next-link-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ==========================================================
   10. Pages —— 版权反馈页
   ========================================================== */

/* --- 内容声明 --- */

.content-declare-section {
  margin-bottom: 40px;
}

.declare-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.declare-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 22px;
}

.declare-item h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.declare-item p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* --- 反馈分类 --- */

.feedback-category-section {
  margin-bottom: 40px;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.category-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
}

.category-media {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
  background-color: var(--color-tag-bg);
}

.category-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.category-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
}

.category-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 12px;
  flex: 1;
}

.category-prepare {
  font-size: 14px;
  color: var(--color-text);
  line-height: 1.6;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

.category-prepare strong {
  display: block;
  font-size: 13px;
  color: var(--color-accent);
  margin-bottom: 4px;
}

/* --- 反馈前准备 --- */

.feedback-prepare-section {
  margin-bottom: 40px;
}

.prepare-intro {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 720px;
}

.prepare-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.prepare-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 24px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.prepare-index {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-accent);
  background-color: #FDF1E3;
  border-radius: var(--radius-sm);
}

.prepare-content h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.prepare-content p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* --- 相关入口 --- */

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding-top: 8px;
  border-top: 1px solid var(--color-border);
}

.related-links a {
  display: inline-block;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-info);
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.related-links a:hover {
  border-color: var(--color-info);
  background-color: var(--color-info-light);
  color: var(--color-info);
}

/* ==========================================================
   11. Pages —— 404 页
   ========================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 40px 24px;
}

.error-box {
  max-width: 560px;
  width: 100%;
  text-align: center;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
}

.error-code {
  font-size: 64px;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
  font-variant-numeric: tabular-nums;
}

.error-box h1 {
  font-size: 24px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 24px;
}

.error-back {
  margin-bottom: 16px;
}

.error-tip {
  font-size: 14px;
  color: var(--color-text-light);
}

/* ==========================================================
   12. Responsive —— 响应式断点
   ========================================================== */

/* --- 1024px 断点 --- */

@media (max-width: 1024px) {
  :root {
    --space-section: 40px;
  }

  .header-shell {
    padding: 0 20px;
  }

  .inner-main,
  .home-main > section,
  .hero-figure {
    padding-left: 20px;
    padding-right: 20px;
  }

  .book-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }

  .layout-shell {
    grid-template-columns: 240px 1fr;
    gap: 24px;
  }

  .map-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .related-links-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-shell {
    padding-left: 20px;
    padding-right: 20px;
  }
}

/* --- 768px 断点 --- */

@media (max-width: 768px) {
  :root {
    --header-height: 60px;
    --space-section: 32px;
  }

  h1 {
    font-size: 22px;
  }

  h2 {
    font-size: 20px;
  }

  .page-title {
    font-size: 22px;
  }

  .section-title,
  .section-heading {
    font-size: 19px;
  }

  .header-shell {
    height: var(--header-height);
    padding: 0 16px;
  }

  .brand-logo {
    font-size: 20px;
  }

  /* 移动端导航 */
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: static;
  }

  .site-nav .nav-list {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 99;
    background-color: var(--color-card);
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 24px;
    gap: 4px;
    overflow-y: auto;
  }

  .nav-list.is-open {
    display: flex;
  }

  .site-nav .nav-list li a {
    padding: 14px 16px;
    font-size: 16px;
    border-radius: var(--radius-md);
    min-height: 48px;
    display: flex;
    align-items: center;
  }

  .site-nav .nav-list li a.is-current {
    background-color: #FDF1E3;
  }

  /* 首页 */
  .hero-figure {
    padding: 16px 16px 20px;
  }

  .hero-figure img {
    max-height: 240px;
  }

  .home-main > section {
    padding-left: 16px;
    padding-right: 16px;
  }

  .express-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .express-card img {
    height: 200px;
  }

  .focus-layout {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .focus-card img {
    height: 220px;
  }

  .steps-row {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .genre-tags {
    gap: 8px;
  }

  .genre-tag {
    padding: 8px 14px;
    font-size: 13px;
  }

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

  .feedback-links a {
    text-align: center;
  }

  /* 内页 */
  .inner-main {
    padding: 0 16px 16px;
  }

  .breadcrumb {
    padding-top: 16px;
    font-size: 13px;
  }

  .page-header {
    padding: 20px 0 20px;
    margin-bottom: 24px;
  }

  .page-description {
    font-size: 14px;
  }

  /* 书架 */
  .book-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
  }

  .filter-group {
    gap: 8px;
  }

  .filter-btn {
    padding: 8px 20px;
    font-size: 14px;
    min-height: 42px;
  }

  .bottom-nav {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  /* 题材分类 */
  .layout-shell {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .category-index {
    position: static;
    order: 2;
  }

  .category-main {
    order: 1;
  }

  .index-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }

  .index-item {
    flex: 1 1 calc(50% - 6px);
    min-width: 140px;
  }

  .category-section {
    padding: 20px 16px;
  }

  .sample-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  /* 人气榜 */
  .rank-item {
    flex-wrap: wrap;
    gap: 12px;
    padding: 14px 16px;
  }

  .rank-number {
    width: 32px;
    height: 32px;
    font-size: 15px;
  }

  .rank-cover {
    width: 56px;
    height: 76px;
  }

  .rank-info {
    flex-basis: calc(100% - 110px);
  }

  .entry-cards {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  /* 更新日历 */
  .calendar-day-group {
    padding: 16px 14px;
  }

  .update-item {
    padding: 8px;
  }

  .update-thumb {
    width: 48px;
    height: 64px;
  }

  .related-links-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .tracking-note-box {
    padding: 18px 16px;
  }

  /* 阅读指南 */
  .steps-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .step-media img {
    height: 140px;
  }

  .map-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .next-links {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  /* 版权反馈 */
  .declare-grid,
  .category-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .prepare-item {
    padding: 16px;
    gap: 12px;
  }

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

  .related-links a {
    text-align: center;
  }

  /* 404 */
  .error-box {
    padding: 32px 20px;
  }

  .error-code {
    font-size: 48px;
  }

  /* 页脚 */
  .footer-shell {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 24px 16px 28px;
  }

  .footer-nav {
    gap: 8px 16px;
  }

  .copyright-line {
    text-align: left;
    margin-top: 4px;
  }
}

/* --- 390px 小屏微调 --- */

@media (max-width: 390px) {
  .book-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .book-meta {
    padding: 8px 8px 0;
  }

  .book-title {
    padding: 4px 8px 0;
    font-size: 14px;
  }

  .book-update {
    padding: 2px 8px 10px;
    font-size: 12px;
  }

  .sample-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .category-section {
    padding: 16px 12px;
  }

  .rank-info {
    flex-basis: 100%;
  }

  .update-item {
    flex-wrap: wrap;
  }

  .update-info {
    flex-basis: calc(100% - 62px);
  }

  .footer-nav {
    flex-direction: column;
    gap: 6px;
  }
}

/* --- 打印样式 --- */

@media print {
  .site-header,
  .site-footer,
  .nav-toggle,
  .breadcrumb {
    display: none;
  }

  .site-main {
    padding: 0;
  }

  .inner-main {
    max-width: 100%;
    padding: 0;
  }

  body {
    background-color: #fff;
  }
}