/* ============================================================
   base — 全站基础变量、重置与字体
   ============================================================ */
:root {
  --color-paper: #FBF6EF;
  --color-cocoa: #2E231E;
  --color-berry: #C8353F;
  --color-pine: #44654C;
  --color-paper-deep: #F3EAE0;
  --color-line: #E3D8CC;
  --color-cocoa-soft: #5C4E46;
  --color-cocoa-light: #7A6C64;
  --font-serif: "Noto Serif SC", "Songti SC", STSong, SimSun, Georgia, serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", sans-serif;
  --container-width: 1200px;
  --content-read-width: 860px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --header-h: 64px;
}

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

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

body {
  background-color: var(--color-paper);
  color: var(--color-cocoa);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.35;
  color: var(--color-cocoa);
}

/* 视觉隐藏，供需要但不可见的标题使用 */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   layout — 全站公共布局骨架
   ============================================================ */

/* 站点主体：内页与首页共用同一套宽度系统 */
.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

/* 内页统一主容器宽度 */
.inner-main {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 64px;
}

/* 首页主容器 */
.home-main {
  width: 100%;
}

/* ============================================================
   components — 页头与导航
   ============================================================ */
.site-header {
  background-color: var(--color-paper);
  border-bottom: 1px solid var(--color-line);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  position: relative;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-cocoa);
  letter-spacing: 0.02em;
}

.brand-name::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-berry);
  margin-left: 4px;
  vertical-align: 3px;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-cocoa);
  border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-list li a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  font-size: 15px;
  color: var(--color-cocoa-soft);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.nav-list li a:hover {
  color: var(--color-berry);
  background-color: rgba(200, 53, 63, 0.06);
}

.nav-list li a.is-current {
  color: var(--color-berry);
  background-color: rgba(200, 53, 63, 0.08);
  border-color: rgba(200, 53, 63, 0.18);
  font-weight: 600;
}

/* ============================================================
   components — 面包屑
   ============================================================ */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 20px 0 0;
  font-size: 14px;
  color: var(--color-cocoa-light);
}

.breadcrumb a {
  color: var(--color-berry);
  min-height: 28px;
  display: inline-flex;
  align-items: center;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb-sep {
  color: var(--color-cocoa-light);
  font-size: 13px;
}

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

/* ============================================================
   components — 页脚
   ============================================================ */
.site-footer {
  background-color: var(--color-cocoa);
  color: rgba(255, 255, 255, 0.82);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.1fr 2fr;
  gap: 48px;
}

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.footer-brand-name::after {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-berry);
  margin-left: 4px;
  vertical-align: 3px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.7);
  max-width: 320px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-col h3 {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}

.footer-col ul li {
  margin-bottom: 6px;
}

.footer-col ul li a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.72);
  transition: color 0.2s ease;
}

.footer-col ul li a:hover {
  color: #fff;
}

.footer-tip {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
  line-height: 1.7;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 18px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

/* ============================================================
   components — 通用区块标题、编号、文字链
   ============================================================ */
.section-title {
  font-size: 22px;
  font-weight: 700;
}

.section-heading {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
}

.section-index,
.section-no,
.section-number {
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-berry);
  letter-spacing: 0.03em;
}

.section-desc {
  font-size: 15px;
  color: var(--color-cocoa-soft);
  margin-bottom: 20px;
  max-width: 720px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 600;
  min-height: 36px;
  padding: 0 2px;
  color: var(--color-berry);
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.text-link:hover {
  border-bottom-color: var(--color-berry);
}

.text-link::after {
  content: "→";
  font-size: 15px;
  line-height: 1;
}

/* 影像边框：为内容画面加统一细边框 */
.media-figure,
.intro-figure,
.guide-figure,
.records-figure,
.boundary-figure,
.faq-transition-figure {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-paper-deep);
  overflow: hidden;
}

.media-figure img,
.intro-figure img,
.guide-figure img,
.records-figure img,
.boundary-figure img,
.faq-transition-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-figure figcaption,
.intro-figure figcaption,
.guide-figure figcaption,
.records-figure figcaption,
.boundary-figure figcaption,
.faq-transition-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--color-cocoa-light);
  background-color: var(--color-paper);
  border-top: 1px solid var(--color-line);
  line-height: 1.6;
}

/* ============================================================
   pages — 首页
   ============================================================ */
.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 64px;
}

/* 首页双轨布局：窄侧栏 + 宽内容轨 */
.page-layout.sidebar-left {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 48px;
  align-items: start;
  padding: 40px 0 0;
}

/* 左侧固定定位栏 */
.brand-sidebar {
  position: sticky;
  top: calc(var(--header-h) + 24px);
}

.sidebar-inner {
  padding: 24px 0;
  border-top: 3px solid var(--color-cocoa);
}

.home-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 14px;
}

.home-slogan {
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--color-cocoa-soft);
  line-height: 1.7;
  margin-bottom: 16px;
  padding-left: 14px;
  border-left: 3px solid var(--color-berry);
}

.home-intro {
  font-size: 14px;
  color: var(--color-cocoa-light);
  line-height: 1.8;
  margin-bottom: 28px;
}

.sidebar-nav ul {
  display: flex;
  flex-direction: column;
}

.sidebar-nav ul li {
  border-bottom: 1px solid var(--color-line);
}

.sidebar-nav ul li a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 4px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-cocoa);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.sidebar-nav ul li a:hover {
  color: var(--color-berry);
  padding-left: 8px;
}

/* 右侧内容长栏 */
.content-track {
  display: flex;
  flex-direction: column;
  gap: 56px;
  min-width: 0;
}

/* 主视觉区 */
.hero-visual {
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 40px;
}

.hero-media {
  margin-bottom: 24px;
}

.hero-media .media-figure {
  width: 100%;
  aspect-ratio: 16 / 7;
}

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

.hero-copy {
  max-width: 680px;
}

.hero-copy .section-title {
  margin-bottom: 12px;
}

.hero-copy p {
  font-size: 16px;
  color: var(--color-cocoa-soft);
  line-height: 1.8;
  margin-bottom: 16px;
}

/* 频道影集速览 */
.channel-preview {
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 40px;
}

.preview-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--color-line);
}

.preview-row {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 18px 8px;
  border-bottom: 1px solid var(--color-line);
  transition: background-color 0.2s ease;
}

.preview-row:hover {
  background-color: rgba(200, 53, 63, 0.04);
}

.row-name {
  flex-shrink: 0;
  width: 120px;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-cocoa);
  padding-left: 12px;
  border-left: 3px solid var(--color-berry);
}

.row-desc {
  font-size: 14px;
  color: var(--color-cocoa-soft);
  line-height: 1.7;
}

.preview-media {
  margin-top: 28px;
}

.preview-media .media-figure {
  width: 100%;
  aspect-ratio: 21 / 9;
}

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

/* 主题片单引子 */
.list-teaser {
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 40px;
}

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

.taste-item {
  padding: 20px 18px;
  background-color: var(--color-paper-deep);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-pine);
}

.taste-name {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-cocoa);
}

.taste-desc {
  font-size: 14px;
  color: var(--color-cocoa-soft);
  line-height: 1.7;
}

/* 观看指南预告 */
.guide-teaser {
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 40px;
}

.step-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 16px;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-line);
}

.step-item:first-child {
  border-top: 1px solid var(--color-line);
}

.step-num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-berry);
  background-color: rgba(200, 53, 63, 0.08);
  border-radius: 50%;
}

.step-copy {
  flex: 1;
}

.step-copy p {
  font-size: 14px;
  color: var(--color-cocoa-soft);
  line-height: 1.7;
}

.step-copy a {
  font-size: 14px;
  min-height: 32px;
  display: inline-flex;
  align-items: center;
}

/* 近期整理线索 */
.recent-notes {
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 40px;
}

.notes-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.notes-list li {
  padding: 12px 0;
  font-size: 15px;
  color: var(--color-cocoa-soft);
  border-bottom: 1px dashed var(--color-line);
  padding-left: 18px;
  position: relative;
}

.notes-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-pine);
}

/* 问题与边界双入口 */
.help-exit {
  padding-bottom: 8px;
}

.help-exit .section-title {
  margin-bottom: 20px;
}

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

.exit-item {
  padding: 24px 22px;
  background-color: var(--color-paper-deep);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.exit-item:hover {
  border-color: var(--color-berry);
  box-shadow: 0 2px 8px rgba(46, 35, 30, 0.06);
}

.exit-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.exit-item p {
  font-size: 14px;
  color: var(--color-cocoa-soft);
  line-height: 1.7;
  margin-bottom: 12px;
}

/* ============================================================
   pages — 内页公共标题区
   ============================================================ */
.page-header {
  padding: 24px 0 32px;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 40px;
}

.page-description {
  font-size: 14px;
  color: var(--color-berry);
  font-weight: 600;
  letter-spacing: 0.05em;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-description::before {
  content: "";
  width: 24px;
  height: 2px;
  background-color: var(--color-berry);
  display: inline-block;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 12px;
}

.page-intro,
.page-lead {
  font-size: 16px;
  color: var(--color-cocoa-soft);
  line-height: 1.8;
  max-width: 720px;
}

/* ============================================================
   pages — 频道影集页
   ============================================================ */
/* 导览区：左右分栏 */
.intro-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-line);
}

.intro-copy .section-title {
  margin-bottom: 16px;
}

.intro-copy p {
  font-size: 15px;
  color: var(--color-cocoa-soft);
  line-height: 1.8;
  margin-bottom: 14px;
}

.intro-figure {
  width: 100%;
  aspect-ratio: 4 / 3;
}

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

/* 频道影集分类列表 */
.set-section {
  margin-bottom: 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-line);
}

.set-section > .section-title {
  margin-bottom: 24px;
}

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

.set-item {
  padding: 24px 22px;
  background-color: var(--color-paper-deep);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  border-top: 3px solid transparent;
  transition: border-color 0.2s ease;
}

.set-item:hover {
  border-top-color: var(--color-berry);
}

.set-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-cocoa);
}

.set-desc {
  font-size: 14px;
  color: var(--color-cocoa-soft);
  line-height: 1.7;
  margin-bottom: 10px;
}

.set-context {
  font-size: 14px;
  color: var(--color-cocoa-light);
  line-height: 1.7;
  margin-bottom: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--color-pine);
}

/* 频道与片单阅读顺序提示 */
.relation-note {
  margin-bottom: 56px;
  padding: 32px;
  background-color: var(--color-paper-deep);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--color-pine);
}

.relation-note .section-title {
  margin-bottom: 14px;
}

.relation-note p {
  font-size: 15px;
  color: var(--color-cocoa-soft);
  line-height: 1.8;
  margin-bottom: 12px;
}

.relation-links {
  display: flex;
  gap: 24px;
  margin-top: 16px;
  flex-wrap: wrap;
}

/* 相关内容双向入口 */
.related-entry {
  margin-bottom: 48px;
}

.related-entry[aria-label="相关栏目入口"] {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

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

.entry-card .entry-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.entry-card p {
  font-size: 14px;
  color: var(--color-cocoa-soft);
  line-height: 1.7;
  margin-bottom: 12px;
}

/* 补充信息入口 */
.aside-links {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-top: 1px solid var(--color-line);
}

.aside-links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 14px;
}

/* ============================================================
   pages — 主题片单页
   ============================================================ */
.section-block {
  margin-bottom: 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-line);
}

.section-block:last-of-type {
  border-bottom: none;
}

.section-block .section-heading {
  margin-bottom: 16px;
}

.section-block > p {
  font-size: 15px;
  color: var(--color-cocoa-soft);
  line-height: 1.8;
  margin-bottom: 20px;
  max-width: 720px;
}

/* 维度对照表 */
.dimension-table-wrap {
  overflow-x: auto;
  margin: 20px 0;
}

.dimension-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  min-width: 560px;
}

.dimension-table thead th {
  background-color: var(--color-cocoa);
  color: #fff;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 14px;
  padding: 14px 16px;
  text-align: left;
}

.dimension-table tbody td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
  line-height: 1.7;
}

.dimension-table tbody tr:nth-child(even) {
  background-color: var(--color-paper-deep);
}

.dimension-table tbody tr:hover {
  background-color: rgba(200, 53, 63, 0.04);
}

/* 口味示例列表 */
.flavor-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 24px 0;
}

.flavor-item {
  padding: 20px 18px;
  background-color: var(--color-paper-deep);
  border-radius: var(--radius-md);
  border-top: 3px solid var(--color-pine);
}

/* 自己组片单步骤 */
.step-list {
  margin: 20px 0;
}

.step-no {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-berry);
  background-color: rgba(200, 53, 63, 0.08);
  border-radius: 50%;
}

/* 相关入口 */
.entry-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.entry-links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 15px;
  font-weight: 600;
  padding: 0 4px;
  border-bottom: 1px solid transparent;
}

.entry-links a:hover {
  border-bottom-color: var(--color-berry);
}

/* 页尾相关链接条 */
.related-links {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--color-line);
  flex-wrap: wrap;
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-cocoa);
}

.related-links-item {
  font-size: 14px;
  min-height: 36px;
  display: inline-flex;
  align-items: center;
}

/* ============================================================
   pages — 观看指南页
   ============================================================ */
.guide-intro-block {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-line);
}

.guide-intro-text .section-title {
  font-size: 22px;
  margin-bottom: 16px;
}

.guide-intro-text p {
  font-size: 15px;
  color: var(--color-cocoa-soft);
  line-height: 1.8;
  margin-bottom: 14px;
}

.guide-figure {
  width: 100%;
  aspect-ratio: 4 / 3;
}

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

/* 主流程步骤带 */
.main-steps-section {
  margin-bottom: 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-line);
}

.main-steps-section > h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.section-note {
  font-size: 15px;
  color: var(--color-cocoa-soft);
  line-height: 1.8;
  margin-bottom: 24px;
  max-width: 720px;
}

.guide-steps-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  counter-reset: guide-step;
}

.guide-step-item {
  display: flex;
  gap: 16px;
  padding: 20px 18px;
  background-color: var(--color-paper-deep);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-berry);
}

.step-number {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-berry);
  background-color: rgba(200, 53, 63, 0.1);
  border-radius: 50%;
}

.step-content h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.step-content p {
  font-size: 14px;
  color: var(--color-cocoa-soft);
  line-height: 1.7;
  margin-bottom: 8px;
}

.step-content a {
  font-size: 14px;
  min-height: 32px;
  display: inline-flex;
  align-items: center;
}

/* 入口常见情况 */
.entry-issues-section {
  margin-bottom: 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-line);
}

.entry-issues-section > h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.issue-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.issue-item {
  padding: 18px 16px;
  background-color: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
}

.issue-item h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
  padding-left: 14px;
  border-left: 3px solid var(--color-pine);
}

.issue-item p {
  font-size: 14px;
  color: var(--color-cocoa-soft);
  line-height: 1.7;
}

/* 观前检查清单 */
.checklist-section {
  margin-bottom: 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-line);
}

.checklist-section > h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

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

.check-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 12px;
  background-color: var(--color-paper-deep);
  border-radius: var(--radius-sm);
}

.check-box {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-pine);
  border-radius: 4px;
  margin-top: 2px;
  position: relative;
}

.check-box::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 2px;
  width: 6px;
  height: 10px;
  border-right: 2px solid var(--color-pine);
  border-bottom: 2px solid var(--color-pine);
  transform: rotate(45deg);
}

.check-text {
  font-size: 15px;
  color: var(--color-cocoa);
  line-height: 1.7;
}

/* 相关入口区 */
.related-entry-section {
  margin-bottom: 40px;
}

.related-entry-section > h2 {
  font-size: 22px;
  margin-bottom: 20px;
}

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

.related-entry-card {
  padding: 24px 22px;
  background-color: var(--color-paper-deep);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
}

.related-entry-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.related-entry-card p {
  font-size: 14px;
  color: var(--color-cocoa-soft);
  line-height: 1.7;
  margin-bottom: 12px;
}

/* ============================================================
   pages — 收录档案页
   ============================================================ */
.records-overview {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-line);
}

.records-overview-text .section-title {
  margin-bottom: 16px;
}

.records-overview-text p {
  font-size: 15px;
  color: var(--color-cocoa-soft);
  line-height: 1.8;
  margin-bottom: 14px;
}

.records-figure {
  width: 100%;
  aspect-ratio: 4 / 3;
}

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

/* 栏目收录规则 */
.records-rules {
  margin-bottom: 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-line);
}

.records-rules > h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.rules-intro {
  font-size: 15px;
  color: var(--color-cocoa-soft);
  margin-bottom: 24px;
}

.rules-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.rule-item {
  padding: 20px 18px;
  background-color: var(--color-paper-deep);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-pine);
}

.rule-item h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.rule-item p {
  font-size: 14px;
  color: var(--color-cocoa-soft);
  line-height: 1.7;
}

/* 近期整理线索 */
.recent-notes-wrap {
  margin-bottom: 56px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-line);
}

.recent-notes-wrap .section-title {
  margin-bottom: 8px;
}

.notes-intro {
  font-size: 15px;
  color: var(--color-cocoa-soft);
  margin-bottom: 20px;
}

/* 相关栏目入口卡片 */
.related-links[aria-label="相关栏目入口"] {
  display: block;
  padding: 0;
  border-top: none;
}

.related-links[aria-label="相关栏目入口"] .section-title {
  font-size: 22px;
  margin-bottom: 8px;
}

.related-intro {
  font-size: 15px;
  color: var(--color-cocoa-soft);
  margin-bottom: 24px;
}

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

.related-card {
  display: block;
  padding: 20px 18px;
  background-color: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.related-card:hover {
  border-color: var(--color-berry);
  background-color: rgba(200, 53, 63, 0.04);
}

.related-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-cocoa);
}

.related-card p {
  font-size: 13px;
  color: var(--color-cocoa-light);
  line-height: 1.6;
}

/* ============================================================
   pages — FAQ 页
   ============================================================ */
.faq-index {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 40px;
  padding: 16px 0;
  border-bottom: 1px solid var(--color-line);
}

.faq-index a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 16px;
  font-size: 14px;
  font-weight: 600;
  background-color: var(--color-paper-deep);
  border: 1px solid var(--color-line);
  border-radius: 20px;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.faq-index a:hover {
  border-color: var(--color-berry);
  background-color: rgba(200, 53, 63, 0.06);
}

.faq-section {
  margin-bottom: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-line);
}

.faq-section:last-of-type {
  border-bottom: none;
}

.faq-section .section-heading {
  margin-bottom: 8px;
}

.faq-section .section-desc {
  margin-bottom: 20px;
}

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

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

.faq-item summary {
  cursor: pointer;
  padding: 16px 18px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-cocoa);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 44px;
  list-style: none;
  transition: background-color 0.2s ease;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-berry);
  flex-shrink: 0;
  line-height: 1;
  transition: transform 0.2s ease;
}

.faq-item[open] summary {
  background-color: var(--color-paper-deep);
}

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

.faq-answer {
  padding: 4px 18px 18px;
  border-top: 1px dashed var(--color-line);
}

.faq-answer p {
  font-size: 15px;
  color: var(--color-cocoa-soft);
  line-height: 1.8;
  margin-top: 14px;
}

/* 过渡配图 */
.faq-transition-figure {
  width: 100%;
  aspect-ratio: 21 / 6;
  margin-bottom: 48px;
}

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

/* 更多链接 */
.faq-more-links {
  margin-top: 40px;
  padding: 28px 0 0;
  border-top: 1px solid var(--color-line);
}

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

.more-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 14px;
  background-color: var(--color-paper-deep);
  border-radius: var(--radius-md);
  transition: background-color 0.2s ease;
}

.more-link:hover {
  background-color: rgba(200, 53, 63, 0.08);
}

.more-link-label {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-cocoa);
}

.more-link-text {
  font-size: 13px;
  color: var(--color-cocoa-light);
  line-height: 1.6;
}

/* ============================================================
   pages — 使用边界页
   ============================================================ */
.boundary-summary {
  margin-bottom: 48px;
  padding: 32px;
  background-color: var(--color-paper-deep);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--color-pine);
}

.boundary-summary .section-title {
  margin-bottom: 16px;
}

.boundary-summary p {
  font-size: 15px;
  color: var(--color-cocoa-soft);
  line-height: 1.8;
  margin-bottom: 12px;
}

.boundary-summary p:last-child {
  margin-bottom: 0;
}

/* 能与不能对照 */
.boundary-compare {
  margin-bottom: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-line);
}

.boundary-compare > .section-title {
  margin-bottom: 20px;
}

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

.compare-col {
  padding: 24px 22px;
  border-radius: var(--radius-lg);
}

.compare-can {
  background-color: rgba(68, 101, 76, 0.08);
  border: 1px solid rgba(68, 101, 76, 0.25);
}

.compare-cannot {
  background-color: rgba(200, 53, 63, 0.06);
  border: 1px solid rgba(200, 53, 63, 0.2);
}

.compare-col h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
}

.compare-can h3 {
  color: var(--color-pine);
}

.compare-cannot h3 {
  color: var(--color-berry);
}

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.boundary-list li {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-cocoa-soft);
  padding-left: 20px;
  position: relative;
}

.boundary-list li::before {
  position: absolute;
  left: 0;
  top: 0;
  font-weight: 700;
}

.compare-can .boundary-list li::before {
  content: "✓";
  color: var(--color-pine);
}

.compare-cannot .boundary-list li::before {
  content: "×";
  color: var(--color-berry);
}

/* 内容引用与信息范围 */
.boundary-reference {
  margin-bottom: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-line);
}

.boundary-reference > .section-title {
  margin-bottom: 12px;
}

.boundary-reference > p {
  font-size: 15px;
  color: var(--color-cocoa-soft);
  line-height: 1.8;
  margin-bottom: 20px;
  max-width: 720px;
}

.reference-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-bottom: 20px;
}

.reference-list li {
  padding: 12px 0;
  font-size: 15px;
  color: var(--color-cocoa-soft);
  line-height: 1.7;
  border-bottom: 1px dashed var(--color-line);
  padding-left: 24px;
  position: relative;
}

.reference-list li::before {
  content: "01";
  position: absolute;
  left: 0;
  top: 12px;
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-berry);
}

.reference-list li:nth-child(2)::before {
  content: "02";
}

.reference-list li:nth-child(3)::before {
  content: "03";
}

.reference-list li:nth-child(4)::before {
  content: "04";
}

/* 反馈路径 */
.boundary-feedback {
  margin-bottom: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-line);
}

.boundary-feedback > .section-title {
  margin-bottom: 12px;
}

.boundary-feedback > p {
  font-size: 15px;
  color: var(--color-cocoa-soft);
  line-height: 1.8;
  margin-bottom: 20px;
  max-width: 720px;
}

.feedback-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.feedback-steps li {
  padding: 20px 16px;
  background-color: var(--color-paper-deep);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--color-cocoa-soft);
  line-height: 1.7;
}

.feedback-steps li strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 16px;
  color: var(--color-cocoa);
  margin-bottom: 8px;
}

.boundary-figure {
  width: 100%;
  aspect-ratio: 21 / 6;
}

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

/* 核心栏目出口 */
.boundary-exits {
  margin-bottom: 32px;
}

.boundary-exits > .section-title {
  margin-bottom: 12px;
}

.boundary-exits > p {
  font-size: 15px;
  color: var(--color-cocoa-soft);
  margin-bottom: 20px;
}

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

.exit-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 16px;
  background-color: var(--color-paper-deep);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.exit-link:hover {
  border-color: var(--color-berry);
  background-color: rgba(200, 53, 63, 0.04);
}

.exit-name {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-cocoa);
}

.exit-desc {
  font-size: 13px;
  color: var(--color-cocoa-light);
  line-height: 1.6;
}

/* ============================================================
   pages — 404
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
}

.error-container {
  max-width: 560px;
  text-align: center;
}

.error-code {
  font-family: var(--font-serif);
  font-size: 72px;
  font-weight: 700;
  color: var(--color-berry);
  line-height: 1.2;
  margin-bottom: 8px;
}

.error-container h1 {
  font-size: 24px;
  margin-bottom: 16px;
}

.error-desc {
  font-size: 16px;
  color: var(--color-cocoa-soft);
  line-height: 1.8;
  margin-bottom: 24px;
}

.error-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.btn-back-home {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 24px;
  background-color: var(--color-berry);
  color: #fff;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  transition: background-color 0.2s ease;
}

.btn-back-home:hover {
  background-color: var(--color-cocoa);
  color: #fff;
}

.error-actions a:not(.btn-back-home) {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--color-cocoa);
  transition: border-color 0.2s ease;
}

.error-actions a:not(.btn-back-home):hover {
  border-color: var(--color-berry);
  color: var(--color-berry);
}

.error-help {
  font-size: 14px;
  color: var(--color-cocoa-light);
  line-height: 1.7;
}

/* ============================================================
   responsive — 响应式断点
   ============================================================ */
@media (max-width: 1024px) {
  .home-main,
  .inner-main {
    padding-left: 20px;
    padding-right: 20px;
  }

  .page-layout.sidebar-left {
    grid-template-columns: 260px 1fr;
    gap: 32px;
  }

  .row-name {
    width: 100px;
  }

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

@media (max-width: 860px) {
  /* 首页：侧栏退到上方，内容轨变单列 */
  .page-layout.sidebar-left {
    display: flex;
    flex-direction: column;
    gap: 32px;
  }

  .brand-sidebar {
    position: static;
    width: 100%;
  }

  .sidebar-inner {
    border-top: none;
    padding: 0;
  }

  .home-title {
    font-size: 28px;
  }

  .content-track {
    gap: 48px;
    width: 100%;
  }

  /* 多栏降为双栏或单栏 */
  .taste-grid,
  .set-list,
  .issue-list,
  .check-list,
  .rules-list,
  .related-entry-grid,
  .compare-grid,
  .feedback-steps,
  .more-links-row {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .intro-split,
  .guide-intro-block,
  .records-overview {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .intro-figure,
  .guide-figure,
  .records-figure {
    aspect-ratio: 16 / 9;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-links {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 640px) {
  .header-inner {
    padding: 0 16px;
  }

  .home-main,
  .inner-main {
    padding-left: 16px;
    padding-right: 16px;
  }

  /* 汉堡菜单 */
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background-color: var(--color-paper);
    border-bottom: 1px solid var(--color-line);
    box-shadow: 0 4px 12px rgba(46, 35, 30, 0.08);
    display: block;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px;
    gap: 0;
  }

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

  .nav-list li a {
    display: flex;
    min-height: 44px;
    padding: 0 8px;
    border-radius: var(--radius-sm);
    border-bottom: 1px solid var(--color-line);
  }

  .nav-list li:last-child a {
    border-bottom: none;
  }

  /* 首页单列 */
  .page-layout.sidebar-left {
    padding-top: 24px;
  }

  .hero-media .media-figure {
    aspect-ratio: 16 / 9;
  }

  .preview-media .media-figure {
    aspect-ratio: 16 / 9;
  }

  .preview-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 16px 4px;
  }

  .row-name {
    width: auto;
    font-size: 16px;
  }

  /* 多栏降为单栏 */
  .taste-grid,
  .set-list,
  .issue-list,
  .check-list,
  .rules-list,
  .related-entry-grid,
  .compare-grid,
  .feedback-steps,
  .more-links-row,
  .related-grid,
  .exit-links,
  .guide-steps-list,
  .related-entry[aria-label="相关栏目入口"],
  .exit-grid,
  .related-entry-grid {
    grid-template-columns: 1fr;
  }

  .step-item {
    flex-direction: row;
  }

  .step-num {
    width: 28px;
    height: 28px;
    font-size: 14px;
  }

  .page-header {
    padding: 16px 0 24px;
    margin-bottom: 32px;
  }

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

  .breadcrumb {
    padding-top: 16px;
  }

  .footer-inner {
    padding: 32px 16px 24px;
  }

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

  .footer-bottom {
    padding: 14px 16px;
  }

  .faq-index {
    gap: 8px;
  }

  .faq-index a {
    padding: 0 12px;
    font-size: 13px;
  }

  .faq-transition-figure {
    aspect-ratio: 16 / 7;
  }

  .boundary-figure {
    aspect-ratio: 16 / 7;
  }

  .error-code {
    font-size: 56px;
  }

  .error-container {
    text-align: left;
  }

  .error-actions {
    justify-content: flex-start;
  }
}

/* 减少动态偏好：关闭平滑滚动 */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}