/* ============================================================
   base
   ============================================================ */

:root {
  --color-dark: #333333;
  --color-gray: #666666;
  --color-light-gray: #999999;
  --color-bg: #f5f5f5;
  --color-white: #ffffff;
  --color-accent: #c0392b;
  --font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --container-width: 1200px;
  --radius: 8px;
  --transition: 0.25s ease;
}

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

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-dark);
  background-color: var(--color-white);
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition);
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 300;
  line-height: 1.4;
  color: var(--color-dark);
}

h1 {
  font-size: 32px;
  font-weight: 300;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 20px;
}

h4 {
  font-size: 17px;
  font-weight: 400;
}

p {
  margin-bottom: 12px;
}

/* ============================================================
   layout
   ============================================================ */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid #e5e5e5;
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.brand-name {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-dark);
  letter-spacing: 1px;
}

.brand-slogan {
  font-size: 12px;
  color: var(--color-light-gray);
}

.site-nav {
  display: flex;
  align-items: center;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-dark);
  margin: 5px 0;
  transition: background-color 0.3s;
}

.nav-list {
  display: flex;
  gap: 32px;
}

.nav-list a {
  display: block;
  padding: 8px 2px;
  color: var(--color-gray);
  font-size: 15px;
}

.nav-list a:hover,
.nav-list a.is-current {
  color: var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 6px;
}

.site-footer {
  background-color: var(--color-bg);
  padding: 48px 24px 24px;
  margin-top: 64px;
}

.site-footer .container {
  max-width: var(--container-width);
  margin: 0 auto;
}

.footer-brand {
  margin-bottom: 32px;
}

.footer-brand p {
  color: var(--color-gray);
  font-size: 14px;
  margin-bottom: 0;
}

.footer-brand strong {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-dark);
  margin-right: 12px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid #ddd;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 16px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  color: var(--color-gray);
  font-size: 14px;
}

.footer-col ul li a:hover {
  color: var(--color-accent);
}

.copyright {
  text-align: center;
  color: var(--color-light-gray);
  font-size: 13px;
  padding-top: 24px;
  margin-bottom: 0;
}

/* 通用容器 */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   components
   ============================================================ */

/* 面包屑 */
.breadcrumb {
  font-size: 14px;
  color: var(--color-light-gray);
  margin-bottom: 24px;
  padding: 16px 0 0;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
  width: 100%;
  padding-left: 24px;
  padding-right: 24px;
}

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

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

.breadcrumb-sep {
  margin: 0 8px;
  color: #ccc;
}

.breadcrumb-current {
  color: var(--color-dark);
}

/* 页面标题区 */
.page-header {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px 24px 24px;
}

.page-title {
  font-size: 32px;
  font-weight: 300;
  margin-bottom: 12px;
}

.page-description {
  font-size: 16px;
  color: var(--color-gray);
  max-width: 720px;
}

/* 区块标题 */
.section-title {
  font-size: 24px;
  font-weight: 300;
  color: var(--color-dark);
  margin-bottom: 24px;
  position: relative;
  padding-bottom: 12px;
}

.section-title::after {
  content: "";
  display: block;
  width: 32px;
  height: 3px;
  background-color: var(--color-accent);
  margin-top: 8px;
}

/* 更多链接 */
.more-link {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  color: var(--color-accent);
}

.more-link:hover {
  color: var(--color-dark);
}

/* 按钮 */
.btn-cta {
  display: inline-block;
  padding: 12px 32px;
  background-color: var(--color-accent);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  font-size: 16px;
  transition: background-color var(--transition);
}

.btn-cta:hover {
  background-color: var(--color-dark);
  color: var(--color-white);
}

.btn-back-home {
  display: inline-block;
  padding: 12px 32px;
  background-color: var(--color-accent);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  font-size: 16px;
  transition: background-color var(--transition);
}

.btn-back-home:hover {
  background-color: var(--color-dark);
  color: var(--color-white);
}

/* 图片容器通用约束 */
figure {
  margin: 0;
}

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

/* ============================================================
   pages
   ============================================================ */

/* ---------- 首页 ---------- */

.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* hero 区 */
.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 64px 0 56px;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-copy h1 {
  font-size: 36px;
  font-weight: 300;
  line-height: 1.3;
  margin-bottom: 20px;
}

.hero-copy p {
  font-size: 16px;
  color: var(--color-gray);
  margin-bottom: 28px;
  max-width: 480px;
}

.hero-media {
  display: flex;
  justify-content: center;
}

.hero-figure {
  width: 100%;
  max-width: 520px;
}

.hero-figure img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  border-radius: var(--radius);
}

/* 题材分类导航带 */
.categories-bar {
  padding: 48px 0;
  border-top: 1px solid #eee;
}

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

.category-tags li a {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-bg);
  color: var(--color-dark);
  font-size: 14px;
  border-radius: 4px;
  transition: all var(--transition);
}

.category-tags li a:hover {
  background-color: var(--color-accent);
  color: var(--color-white);
}

/* 最近更新 */
.recent-updates {
  padding: 48px 0;
  border-top: 1px solid #eee;
}

.update-group {
  margin-bottom: 32px;
}

.update-date {
  font-size: 15px;
  font-weight: 400;
  color: var(--color-accent);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid #eee;
}

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

.update-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px;
  background-color: var(--color-white);
  border: 1px solid #eee;
  border-radius: var(--radius);
  transition: box-shadow var(--transition);
}

.update-item:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.update-item img {
  width: 72px;
  height: 96px;
  object-fit: cover;
  border-radius: 4px;
  flex-shrink: 0;
}

.update-info h4 {
  font-size: 15px;
  font-weight: 400;
  margin-bottom: 8px;
}

.status {
  display: inline-block;
  font-size: 12px;
  color: var(--color-accent);
  background-color: #fdf0ee;
  padding: 2px 8px;
  border-radius: 2px;
}

/* 人气榜单预览 */
.ranking-preview {
  padding: 48px 0;
  border-top: 1px solid #eee;
}

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

.ranking-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 16px;
  background-color: var(--color-white);
  border: 1px solid #eee;
  border-radius: var(--radius);
  transition: box-shadow var(--transition);
}

.ranking-item:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.rank-number {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-accent);
  min-width: 32px;
  text-align: center;
}

.ranking-item img {
  width: 56px;
  height: 72px;
  object-fit: cover;
  border-radius: 4px;
  flex-shrink: 0;
}

.rank-detail {
  flex: 1;
}

.rank-detail h3 {
  font-size: 16px;
  font-weight: 400;
  margin-bottom: 4px;
}

.rank-detail h3 a {
  color: var(--color-dark);
}

.rank-detail h3 a:hover {
  color: var(--color-accent);
}

.rank-detail p {
  font-size: 14px;
  color: var(--color-gray);
  margin-bottom: 0;
}

/* 指南入口 */
.guide-entry {
  padding: 48px 0;
  border-top: 1px solid #eee;
}

.guide-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.guide-card {
  padding: 24px;
  background-color: var(--color-bg);
  border-radius: var(--radius);
  transition: box-shadow var(--transition);
}

.guide-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.guide-card h3 {
  font-size: 18px;
  font-weight: 400;
  margin-bottom: 12px;
}

.guide-card h3 a {
  color: var(--color-dark);
}

.guide-card h3 a:hover {
  color: var(--color-accent);
}

.guide-card p {
  font-size: 14px;
  color: var(--color-gray);
  margin-bottom: 0;
}

/* 版权说明 */
.copyright-note {
  padding: 40px 0;
  border-top: 1px solid #eee;
}

.copyright-note p {
  font-size: 14px;
  color: var(--color-gray);
  max-width: 800px;
}

/* ---------- 内页通用 ---------- */

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 48px;
}

/* 主内容 + 侧栏布局 */
.layout-shell {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 48px;
  align-items: start;
}

.page-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 48px;
  align-items: start;
}

.main-content {
  min-width: 0;
}

.sidebar {
  background-color: var(--color-bg);
  padding: 24px;
  border-radius: var(--radius);
}

.sidebar h2 {
  font-size: 18px;
  font-weight: 400;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid #ddd;
}

.related-links li {
  margin-bottom: 12px;
}

.related-links li a {
  font-size: 14px;
  color: var(--color-gray);
}

.related-links li a:hover {
  color: var(--color-accent);
}

.sidebar-note {
  font-size: 13px;
  color: var(--color-light-gray);
  margin-top: 16px;
}

.sidebar-note a {
  font-size: 13px;
}

/* ---------- 分类页 ---------- */

.category-intro {
  margin-bottom: 40px;
}

.category-intro h2 {
  font-size: 20px;
  font-weight: 400;
  margin-bottom: 16px;
}

.category-intro p {
  color: var(--color-gray);
  font-size: 15px;
  max-width: 800px;
}

.category-grid {
  margin-bottom: 40px;
}

.category-grid h2 {
  font-size: 20px;
  font-weight: 400;
  margin-bottom: 24px;
}

.category-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.category-card {
  background-color: var(--color-white);
  border: 1px solid #eee;
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow var(--transition);
}

.category-card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.card-link {
  display: block;
  color: var(--color-dark);
}

.card-figure {
  position: relative;
  width: 100%;
  height: 180px;
  overflow: hidden;
}

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

.card-figure figcaption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 8px 12px;
  background-color: rgba(51, 51, 51, 0.7);
  color: var(--color-white);
  font-size: 13px;
}

.category-card h3 {
  font-size: 16px;
  font-weight: 400;
  padding: 12px 16px 4px;
}

.category-card p {
  font-size: 14px;
  color: var(--color-gray);
  padding: 0 16px 16px;
  margin-bottom: 0;
}

.related-links {
  margin-top: 40px;
}

.related-links h2 {
  font-size: 20px;
  font-weight: 400;
  margin-bottom: 16px;
}

.related-links p {
  color: var(--color-gray);
  font-size: 14px;
}

.related-links a {
  margin-right: 16px;
}

/* ---------- 指南页 ---------- */

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

.guide-section h2 {
  font-size: 20px;
  font-weight: 400;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid #eee;
}

.guide-section p {
  color: var(--color-gray);
  font-size: 15px;
  margin-bottom: 12px;
}

.guide-figure {
  width: 100%;
  max-width: 640px;
  margin: 16px 0;
}

.guide-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius);
}

.guide-figure figcaption {
  font-size: 13px;
  color: var(--color-light-gray);
  padding: 8px 0;
}

/* ---------- 更新页 ---------- */

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

.update-group {
  margin-bottom: 32px;
}

.group-date {
  font-size: 15px;
  font-weight: 400;
  color: var(--color-accent);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid #eee;
}

.update-list .update-item {
  display: flex;
  gap: 16px;
  padding: 16px;
  background-color: var(--color-white);
  border: 1px solid #eee;
  border-radius: var(--radius);
  margin-bottom: 12px;
}

.update-cover {
  width: 80px;
  height: 108px;
  object-fit: cover;
  border-radius: 4px;
  flex-shrink: 0;
}

.update-info {
  flex: 1;
}

.update-title {
  font-size: 16px;
  font-weight: 400;
  margin-bottom: 4px;
}

.update-meta {
  font-size: 13px;
  color: var(--color-light-gray);
  margin-bottom: 6px;
}

.update-desc {
  font-size: 14px;
  color: var(--color-gray);
  margin-bottom: 0;
}

.update-note {
  background-color: var(--color-bg);
  padding: 24px;
  border-radius: var(--radius);
}

.update-note h2 {
  font-size: 18px;
  font-weight: 400;
  margin-bottom: 12px;
}

.update-note p {
  font-size: 14px;
  color: var(--color-gray);
}

.update-note a {
  margin-right: 16px;
  font-size: 14px;
}

/* ---------- 榜单页 ---------- */

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

.ranking-section h2 {
  font-size: 20px;
  font-weight: 400;
  margin-bottom: 24px;
}

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

.ranking-section .ranking-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background-color: var(--color-white);
  border: 1px solid #eee;
  border-radius: var(--radius);
}

.ranking-number {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-accent);
  min-width: 36px;
  text-align: center;
}

.ranking-section .ranking-item img {
  width: 64px;
  height: 84px;
  object-fit: cover;
  border-radius: 4px;
  flex-shrink: 0;
}

.ranking-info {
  flex: 1;
}

.ranking-info h3 {
  font-size: 16px;
  font-weight: 400;
  margin-bottom: 4px;
}

.ranking-info p {
  font-size: 14px;
  color: var(--color-gray);
  margin-bottom: 6px;
}

.badge {
  display: inline-block;
  font-size: 12px;
  color: var(--color-accent);
  background-color: #fdf0ee;
  padding: 2px 10px;
  border-radius: 2px;
}

.ranking-note {
  background-color: var(--color-bg);
  padding: 24px;
  border-radius: var(--radius);
}

.ranking-note h2 {
  font-size: 18px;
  font-weight: 400;
  margin-bottom: 12px;
}

.ranking-note p {
  font-size: 14px;
  color: var(--color-gray);
}

.ranking-note span {
  display: inline-block;
  margin-right: 16px;
}

.ranking-note span a {
  font-size: 14px;
}

/* ---------- 追更技巧页 ---------- */

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

.tip-section .section-title {
  font-size: 20px;
  font-weight: 400;
}

.content-media {
  width: 100%;
  max-width: 640px;
  margin: 16px 0;
}

.content-media img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius);
}

.content-media figcaption {
  font-size: 13px;
  color: var(--color-light-gray);
  padding: 8px 0;
}

.section-lead {
  font-size: 16px;
  color: var(--color-gray);
  margin-bottom: 24px;
}

.tip-item {
  margin-bottom: 24px;
  padding: 20px;
  background-color: var(--color-bg);
  border-radius: var(--radius);
}

.tip-title {
  font-size: 16px;
  font-weight: 400;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.tip-item p {
  font-size: 14px;
  color: var(--color-gray);
  margin-bottom: 0;
}

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

.faq-section .section-title {
  font-size: 20px;
  font-weight: 400;
}

.faq-item {
  border: 1px solid #eee;
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 400;
  background-color: var(--color-white);
  transition: background-color var(--transition);
}

.faq-item summary:hover {
  background-color: var(--color-bg);
}

.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--color-gray);
  margin-bottom: 0;
}

.suggestion-section {
  background-color: var(--color-bg);
  padding: 24px;
  border-radius: var(--radius);
}

.suggestion-section h2 {
  font-size: 18px;
  font-weight: 400;
  margin-bottom: 12px;
}

.suggestion-section p {
  font-size: 14px;
  color: var(--color-gray);
}

.suggestion-section a {
  margin-right: 16px;
  font-size: 14px;
}

/* 侧栏 box */
.sidebar-box {
  margin-bottom: 24px;
}

.sidebar-box:last-child {
  margin-bottom: 0;
}

.sidebar-title {
  font-size: 16px;
  font-weight: 400;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid #ddd;
}

.sidebar-links li {
  margin-bottom: 10px;
}

.sidebar-links li a {
  font-size: 14px;
  color: var(--color-gray);
}

.sidebar-links li a:hover {
  color: var(--color-accent);
}

/* ---------- 404 页 ---------- */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
}

.error-content {
  text-align: center;
  max-width: 480px;
}

.error-code {
  font-size: 72px;
  font-weight: 600;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-content h1 {
  font-size: 24px;
  font-weight: 400;
  margin-bottom: 16px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-gray);
  margin-bottom: 24px;
}

/* ============================================================
   responsive
   ============================================================ */

@media (max-width: 992px) {
  .category-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .layout-shell,
  .page-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .sidebar {
    order: 2;
  }
}

@media (max-width: 768px) {
  .site-header .container {
    height: 64px;
    padding: 0 16px;
  }

  .brand-slogan {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    flex-direction: column;
    gap: 0;
    padding: 8px 0;
    border-bottom: 1px solid #eee;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  }

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

  .nav-list li {
    width: 100%;
  }

  .nav-list a {
    padding: 12px 24px;
    font-size: 16px;
    border-bottom: none;
  }

  .nav-list a:hover,
  .nav-list a.is-current {
    border-bottom: none;
    background-color: var(--color-bg);
    padding: 12px 24px;
  }

  .hero-section {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 40px 0 32px;
  }

  .hero-copy h1 {
    font-size: 28px;
  }

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

  .update-list {
    grid-template-columns: 1fr;
  }

  .guide-cards {
    grid-template-columns: 1fr;
  }

  .footer-links {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .inner-main {
    padding: 0 16px 32px;
  }

  .breadcrumb {
    padding-left: 16px;
    padding-right: 16px;
  }

  .page-header {
    padding: 12px 16px 20px;
  }

  .page-title {
    font-size: 26px;
  }

  .category-cards {
    grid-template-columns: 1fr;
  }

  .home-main {
    padding: 0 16px;
  }

  .update-list .update-item {
    flex-direction: row;
  }

  .ranking-section .ranking-item {
    flex-wrap: wrap;
  }

  .ranking-info {
    min-width: 0;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 15px;
  }

  .hero-copy h1 {
    font-size: 24px;
  }

  .section-title {
    font-size: 20px;
  }

  .update-item {
    flex-direction: column;
  }

  .update-item img,
  .update-cover {
    width: 100%;
    height: 160px;
  }

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

  .ranking-item img,
  .ranking-section .ranking-item img {
    width: 56px;
    height: 72px;
  }

  .rank-detail {
    min-width: 0;
  }

  .guide-card {
    padding: 16px;
  }

  .category-card .card-figure {
    height: 160px;
  }

  .sidebar {
    padding: 16px;
  }

  .tip-item {
    padding: 16px;
  }
}