/* ==========================================================================
   光棍视频 · 全站样式表
   工艺品牌风：暖灰底、深墨正文、克制圆角、细边框、编号系统
   ========================================================================== */

/* --------------------------------------------------------------------------
   base · 变量与重置
   -------------------------------------------------------------------------- */
:root {
  --bg-page: #f6f2ec;
  --ink: #221f1b;
  --ink-soft: #6b6259;
  --accent: #b8874a;
  --line: #d9d1c6;
  --surface: #ffffff;
  --line-strong: #b9ae9f;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-soft: 0 1px 2px rgba(34, 31, 27, 0.05);
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", monospace;
  --wrap: 1200px;
  --gap: 24px;
  --gap-lg: 40px;
}

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

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

body {
  margin: 0;
  background-color: var(--bg-page);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
dl,
dd,
figure,
blockquote {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

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

a {
  color: var(--ink);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease;
}

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

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

strong {
  font-weight: 700;
  color: var(--ink);
}

table {
  border-collapse: collapse;
  width: 100%;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

time {
  font-variant-numeric: tabular-nums;
}

/* 通用隐藏（仅供表 caption 等无障碍用途） */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* 跳转链接 */
.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 60;
  padding: 10px 16px;
  background-color: var(--ink);
  color: #fff;
  border-radius: var(--radius-sm);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 12px;
  color: #fff;
}

/* 编号与字段名统一等宽数字 */
.brand-mark,
.channel-no,
.card-no,
.step-no,
.step-index,
.collection-index,
.briefing-no,
.timeline-date,
.channel-index,
.error-code {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* --------------------------------------------------------------------------
   layout · 站点头部与导航
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: rgba(246, 242, 236, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: saturate(140%) blur(6px);
}

.header-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  flex: 0 0 auto;
  color: var(--ink);
}

.brand-mark {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0;
}

.brand-tag {
  font-size: 12px;
  color: var(--ink-soft);
  border-left: 1px solid var(--line);
  padding-left: 10px;
}

.site-nav {
  margin-left: auto;
}

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

.nav-list a {
  display: block;
  padding: 8px 12px;
  font-size: 15px;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.nav-list a.is-current {
  color: var(--ink);
  font-weight: 700;
  border-bottom-color: var(--accent);
}

/* 汉堡按钮：桌面隐藏 */
.nav-toggle {
  display: none;
  margin-left: auto;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
  flex-direction: column;
  justify-content: space-between;
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--ink);
  border-radius: 2px;
}

/* --------------------------------------------------------------------------
   layout · 主容器与骨架
   -------------------------------------------------------------------------- */
.site-main {
  display: block;
}

.site-main > section,
.home-main > section {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 48px 24px;
}

.inner-main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px 64px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 13px;
  color: var(--ink-soft);
}

.breadcrumb a {
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.breadcrumb-sep {
  color: var(--line-strong);
}

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

/* 内页标题区 */
.page-header {
  padding: 20px 0 32px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}

.page-title {
  font-size: 32px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--ink);
  max-width: 22em;
}

.page-description {
  margin-top: 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 62ch;
}

.page-lead {
  margin-top: 12px;
  font-size: 16px;
  color: var(--ink-soft);
  max-width: 62ch;
}

/* 通用 section 结构（内页） */
.section {
  margin-bottom: 56px;
}

.section:last-child {
  margin-bottom: 0;
}

.section-title {
  font-size: 24px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--ink);
}

.section-desc,
.section-lead {
  margin-top: 10px;
  color: var(--ink-soft);
  max-width: 68ch;
}

.section-desc a,
.section-lead a,
.section-note a,
.section-foot a,
.aside-note a,
.feedback-desc a {
  color: var(--accent);
  border-bottom: 1px solid rgba(184, 135, 74, 0.4);
}

.section-desc a:hover,
.section-lead a:hover,
.section-note a:hover,
.section-foot a:hover,
.aside-note a:hover,
.feedback-desc a:hover {
  border-bottom-color: var(--accent);
}

.section-note,
.section-foot {
  margin-top: 20px;
  font-size: 14px;
  color: var(--ink-soft);
}

/* 内页两栏骨架：主内容在前，aside 在后 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: var(--gap-lg);
  align-items: start;
}

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

.layout-aside {
  position: sticky;
  top: 88px;
  min-width: 0;
}

/* 若在祖先节点声明了 sidebar-left，则侧栏前置 */
.sidebar-left .page-layout {
  grid-template-columns: 260px minmax(0, 1fr);
}

.sidebar-left .layout-main,
.sidebar-left .content-main {
  order: 2;
}

.sidebar-left .layout-aside {
  order: 1;
}

/* --------------------------------------------------------------------------
   layout · 页脚
   -------------------------------------------------------------------------- */
.site-footer {
  margin-top: 72px;
  background-color: #efe9e0;
  border-top: 1px solid var(--line);
}

.footer-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: minmax(220px, 1.4fr) repeat(3, minmax(140px, 1fr)) minmax(180px, 1fr);
  gap: var(--gap-lg);
  align-items: start;
}

.footer-brand {
  min-width: 0;
}

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

.footer-slogan {
  margin-top: 8px;
  font-size: 14px;
  color: var(--accent);
}

.footer-note {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.footer-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.footer-col {
  min-width: 0;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

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

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

.footer-bound {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.footer-back-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
  margin-bottom: 12px;
}

.back-top {
  display: inline-block;
  padding: 8px 14px;
  font-size: 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  color: var(--ink);
}

.back-top:hover,
.back-top:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

.footer-copy {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 20px 24px 32px;
  font-size: 13px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
}

/* --------------------------------------------------------------------------
   components · 按钮
   -------------------------------------------------------------------------- */
.btn {
  display: inline-block;
  padding: 11px 20px;
  font-size: 15px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.btn-primary {
  background-color: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-ghost {
  background-color: transparent;
  color: var(--ink);
  border-color: var(--line-strong);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   components · 图片容器
   -------------------------------------------------------------------------- */
.hero-media,
.overview-media,
.channel-media,
.collection-cover,
.media-figure,
.section-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--surface);
}

.hero-media img,
.overview-media img,
.channel-media img,
.collection-cover img,
.media-figure img,
.section-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-media figcaption,
.overview-media figcaption,
.channel-media figcaption,
.media-figure figcaption,
.section-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  background-color: var(--surface);
}

/* --------------------------------------------------------------------------
   components · 语义表格
   -------------------------------------------------------------------------- */
.table-wrap,
.mapping-table-wrap {
  margin-top: 20px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--surface);
}

.data-table,
.field-table {
  min-width: 520px;
  font-size: 15px;
}

.data-table caption,
.field-table caption {
  padding: 14px 16px;
  text-align: left;
  font-size: 14px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
}

.data-table th,
.data-table td,
.field-table th,
.field-table td {
  padding: 13px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.data-table thead th,
.field-table thead th {
  background-color: #f2ece3;
  font-size: 14px;
  color: var(--ink);
  font-weight: 700;
}

.data-table tbody th,
.field-table tbody th {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--ink);
  white-space: nowrap;
}

.data-table tbody tr:last-child th,
.data-table tbody tr:last-child td,
.field-table tbody tr:last-child th,
.field-table tbody tr:last-child td {
  border-bottom: 0;
}

/* 频道页对照表 */
.compare-table {
  margin-top: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--surface);
}

.compare-row {
  display: grid;
  grid-template-columns: minmax(140px, 1fr) minmax(0, 2fr);
  border-bottom: 1px solid var(--line);
}

.compare-row:last-child {
  border-bottom: 0;
}

.compare-head {
  background-color: #f2ece3;
  font-weight: 700;
  font-size: 14px;
}

.compare-cell {
  padding: 13px 16px;
  font-size: 15px;
  min-width: 0;
}

.compare-cell + .compare-cell {
  border-left: 1px solid var(--line);
}

/* --------------------------------------------------------------------------
   components · 时间线
   -------------------------------------------------------------------------- */
.timeline {
  margin-top: 22px;
  border-left: 2px solid var(--line);
  padding-left: 22px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.timeline-item {
  position: relative;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--accent);
  border: 2px solid var(--bg-page);
}

.timeline-date {
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.timeline-title {
  margin-top: 4px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.timeline-desc,
.timeline-text {
  margin-top: 6px;
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 68ch;
}

.timeline-desc a,
.timeline-text a {
  color: var(--accent);
  border-bottom: 1px solid rgba(184, 135, 74, 0.4);
}

/* --------------------------------------------------------------------------
   components · FAQ（details）
   -------------------------------------------------------------------------- */
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--surface);
  margin-top: 12px;
  overflow: hidden;
}

.faq-item summary {
  padding: 15px 18px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

.faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--accent);
  flex: 0 0 auto;
}

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

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

.faq-answer,
.faq-item > p {
  padding: 0 18px 16px;
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 68ch;
}

.faq-answer p {
  margin: 0;
}

.faq-answer a,
.faq-item > p a {
  color: var(--accent);
  border-bottom: 1px solid rgba(184, 135, 74, 0.4);
}

/* 观看指南 FAQ 列表容器 */
.faq-list {
  margin-top: 20px;
}

.faq-list .faq-question {
  padding: 15px 18px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.faq-list .faq-question::-webkit-details-marker {
  display: none;
}

.faq-list .faq-question::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--accent);
  flex: 0 0 auto;
}

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

.faq-list .faq-question:hover {
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   components · 要点列表 / 规则列表
   -------------------------------------------------------------------------- */
.point-list,
.rule-list,
.verify-list,
.related-list,
.scope-list,
.excluded-list,
.compare-list {
  margin-top: 20px;
}

.point-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.point-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--surface);
}

.point-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.point-item p {
  font-size: 15px;
  color: var(--ink-soft);
}

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

.rule-list li {
  padding-left: 18px;
  position: relative;
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 68ch;
}

.rule-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 7px;
  height: 7px;
  background-color: var(--accent);
  border-radius: 1px;
}

.rule-list li strong {
  margin-right: 6px;
}

.verify-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.verify-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
}

.verify-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.verify-text {
  font-size: 15px;
  color: var(--ink-soft);
}

/* 延伸阅读条 */
.related-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.related-list li {
  min-width: 0;
}

.related-list a,
.related-item a {
  display: inline-block;
  padding: 9px 16px;
  font-size: 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
  color: var(--ink);
}

.related-list a:hover,
.related-item a:hover,
.related-list a:focus-visible,
.related-item a:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   components · 对照两栏 / 编号步骤
   -------------------------------------------------------------------------- */
.compare-grid {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gap);
}

.compare-col {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--surface);
}

.compare-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.compare-list {
  margin-top: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.compare-list li {
  font-size: 15px;
  color: var(--ink-soft);
  padding-left: 16px;
  position: relative;
}

.compare-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background-color: var(--line-strong);
  border-radius: 50%;
}

/* --------------------------------------------------------------------------
   pages · 首页
   -------------------------------------------------------------------------- */
.home-main {
  display: block;
}

/* 首屏编辑层级区 */
.hero-editorial {
  display: grid;
  grid-template-columns: minmax(0, 1.75fr) minmax(260px, 1fr);
  gap: var(--gap-lg);
  align-items: start;
  padding-top: 40px;
}

.hero-lead {
  min-width: 0;
}

.hero-kicker {
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

.site-h1 {
  font-size: 32px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--ink);
  max-width: 20em;
}

.hero-intro {
  margin-top: 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 60ch;
}

.hero-media {
  margin-top: 24px;
  aspect-ratio: 16 / 9;
}

.hero-facts {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
}

.hero-facts li {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
  font-size: 14px;
  color: var(--ink-soft);
}

.hero-facts strong {
  display: block;
  font-size: 15px;
  color: var(--ink);
  margin-bottom: 4px;
}

.hero-actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 首屏右侧频道快讯 */
.hero-side {
  min-width: 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--surface);
}

.side-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.side-note {
  margin-top: 12px;
  font-size: 14px;
  color: var(--ink-soft);
}

.briefing-list {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
}

.briefing-list li {
  display: grid;
  grid-template-columns: 28px minmax(0, auto);
  grid-template-areas:
    "no name"
    "no desc";
  column-gap: 10px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}

.briefing-list li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.briefing-no {
  grid-area: no;
  font-size: 13px;
  color: var(--accent);
  padding-top: 2px;
}

.briefing-list a {
  grid-area: name;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.briefing-desc {
  grid-area: desc;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

/* 题材频道方向总览 */
.section-head {
  margin-bottom: 26px;
}

.section-head .section-title {
  font-size: 24px;
}

.section-head .section-desc {
  margin-top: 10px;
}

.channel-overview .channel-rows {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line);
}

.channel-overview .channel-row {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
  padding: 20px 4px;
  border-bottom: 1px solid var(--line);
  transition: background-color 0.18s ease;
}

.channel-overview .channel-row:hover {
  background-color: rgba(184, 135, 74, 0.05);
}

.channel-overview .channel-no {
  font-size: 15px;
  color: var(--accent);
}

.channel-overview .channel-body {
  min-width: 0;
}

.channel-overview .channel-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.channel-overview .channel-desc {
  margin-top: 6px;
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 62ch;
}

.channel-overview .channel-enter {
  flex: 0 0 auto;
  font-size: 14px;
  color: var(--accent);
  border-bottom: 1px solid rgba(184, 135, 74, 0.4);
  white-space: nowrap;
}

.channel-overview .channel-enter:hover,
.channel-overview .channel-enter:focus-visible {
  border-bottom-color: var(--accent);
}

.channel-overview .overview-media {
  margin-top: 28px;
  aspect-ratio: 21 / 9;
}

/* 本期专题片单速览 */
.collection-preview .collection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gap);
  align-items: stretch;
}

.collection-preview .collection-card {
  display: flex;
  flex-direction: column;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--surface);
  min-width: 0;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.collection-preview .collection-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-soft);
}

.collection-preview .card-no {
  font-size: 13px;
  color: var(--accent);
}

.collection-preview .card-title {
  margin-top: 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.collection-preview .card-scope {
  margin-top: 12px;
  font-size: 14px;
  color: var(--ink-soft);
}

.collection-preview .card-scope strong {
  display: block;
  font-size: 13px;
  color: var(--ink);
  margin-bottom: 4px;
}

.collection-preview .card-desc {
  margin-top: 12px;
  font-size: 15px;
  color: var(--ink-soft);
}

.collection-preview .card-enter {
  margin-top: auto;
  padding-top: 18px;
  font-size: 14px;
  color: var(--accent);
  border-bottom: 0;
  align-self: flex-start;
}

.collection-preview .card-enter::after {
  content: " →";
}

.collection-preview .card-enter:hover,
.collection-preview .card-enter:focus-visible {
  color: var(--ink);
}

/* 条目字段与收录边界摘要 */
.field-summary .field-table {
  margin-top: 0;
}

/* 浏览路径三步概览 */
.path-overview .path-steps {
  margin-top: 8px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--gap);
}

.path-overview .path-step {
  padding: 22px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
}

.path-overview .path-step .step-no {
  font-size: 13px;
  color: var(--accent);
}

.path-overview .path-step .step-name {
  margin-top: 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.path-overview .path-step .step-desc {
  margin-top: 8px;
  font-size: 15px;
  color: var(--ink-soft);
}

.path-overview .path-more {
  margin-top: 22px;
  font-size: 15px;
}

.path-overview .path-more a {
  color: var(--accent);
  border-bottom: 1px solid rgba(184, 135, 74, 0.4);
}

.path-overview .path-more a:hover,
.path-overview .path-more a:focus-visible {
  border-bottom-color: var(--accent);
}

/* 站内更新记录与反馈入口 */
.update-log .timeline {
  margin-top: 8px;
}

.update-log .feedback-note {
  margin-top: 32px;
  padding: 22px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
}

.update-log .feedback-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.update-log .feedback-desc {
  margin-top: 10px;
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 70ch;
}

/* --------------------------------------------------------------------------
   pages · 题材频道
   -------------------------------------------------------------------------- */
.page-outline {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--surface);
}

.aside-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.outline-list {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.outline-list a {
  display: block;
  font-size: 14px;
  color: var(--ink-soft);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}

.outline-list a:hover,
.outline-list a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.aside-note {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.section-channel-list .channel-entry {
  display: grid;
  grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
  gap: var(--gap-lg);
  align-items: start;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.section-channel-list .channel-entry:first-of-type {
  border-top: 1px solid var(--line);
}

.section-channel-list .channel-media {
  aspect-ratio: 4 / 3;
}

.section-channel-list .channel-index {
  font-size: 13px;
  color: var(--accent);
}

.section-channel-list .channel-name {
  margin-top: 6px;
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
}

.section-channel-list .channel-orient {
  margin-top: 10px;
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 60ch;
}

.section-channel-list .channel-fit {
  margin-top: 10px;
  font-size: 14px;
  color: var(--ink-soft);
  padding-left: 14px;
  border-left: 2px solid var(--line);
}

.section-channel-list .channel-link {
  margin-top: 14px;
  font-size: 14px;
}

.section-channel-list .channel-link a {
  color: var(--accent);
  border-bottom: 1px solid rgba(184, 135, 74, 0.4);
}

.section-channel-list .channel-link a:hover,
.section-channel-list .channel-link a:focus-visible {
  border-bottom-color: var(--accent);
}

/* --------------------------------------------------------------------------
   pages · 专题片单
   -------------------------------------------------------------------------- */
.section-intro .media-figure {
  margin-top: 24px;
  aspect-ratio: 21 / 9;
}

.section-collections .collection-grid {
  margin-top: 8px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--gap);
  align-items: stretch;
}

.section-collections .collection-card {
  display: flex;
  flex-direction: column;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--surface);
  min-width: 0;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.section-collections .collection-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-soft);
}

.section-collections .collection-cover {
  aspect-ratio: 16 / 10;
  margin-bottom: 16px;
}

.section-collections .collection-index {
  font-size: 13px;
  color: var(--accent);
}

.section-collections .collection-name {
  margin-top: 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.section-collections .collection-scope,
.section-collections .collection-organize {
  margin-top: 12px;
  font-size: 14px;
  color: var(--ink-soft);
}

.section-collections .collection-scene {
  margin-top: 12px;
  font-size: 15px;
  color: var(--ink-soft);
}

.section-collections .collection-link {
  margin-top: auto;
  padding-top: 18px;
  font-size: 14px;
  color: var(--accent);
  border-bottom: 0;
  align-self: flex-start;
}

.section-collections .collection-link::after {
  content: " →";
}

.section-collections .collection-link:hover,
.section-collections .collection-link:focus-visible {
  color: var(--ink);
}

.collection-scope .field-label,
.collection-organize .field-label {
  display: block;
  font-size: 13px;
  color: var(--ink);
  font-weight: 700;
  margin-bottom: 4px;
}

/* --------------------------------------------------------------------------
   pages · 条目字段说明
   -------------------------------------------------------------------------- */
.fields-overview .media-figure {
  margin-top: 22px;
  aspect-ratio: 21 / 9;
}

.fields-detail .field-list {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

.fields-detail .field-item {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--surface);
  min-width: 0;
}

.fields-detail .field-item dt {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  padding-bottom: 10px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.fields-detail .field-item dd {
  font-size: 15px;
  color: var(--ink-soft);
}

.fields-detail .field-mean {
  margin-bottom: 8px;
}

.fields-detail .field-value {
  font-size: 14px;
  color: var(--ink);
}

.fields-detail .field-tip {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--accent);
  font-size: 14px;
  color: var(--ink-soft);
}

.fields-boundary .section-note {
  margin-top: 20px;
}

/* --------------------------------------------------------------------------
   pages · 观看指南
   -------------------------------------------------------------------------- */
.guide-visual .media-figure {
  margin-top: 22px;
  aspect-ratio: 21 / 9;
}

.guide-steps .step-list {
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line);
}

.guide-steps .step-item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.guide-steps .step-index {
  font-size: 15px;
  color: var(--accent);
  padding-top: 2px;
}

.guide-steps .step-body {
  min-width: 0;
}

.guide-steps .step-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.guide-steps .step-text {
  margin-top: 8px;
  font-size: 15px;
  color: var(--ink-soft);
  max-width: 66ch;
}

.guide-steps .step-text a {
  color: var(--accent);
  border-bottom: 1px solid rgba(184, 135, 74, 0.4);
}

.guide-steps .step-note {
  margin-top: 10px;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  font-size: 14px;
  color: var(--ink-soft);
  max-width: 64ch;
}

/* --------------------------------------------------------------------------
   pages · 收录边界与反馈
   -------------------------------------------------------------------------- */
.boundaries-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap-lg);
  align-items: start;
}

.boundaries-layout .content-section {
  margin-bottom: 48px;
  min-width: 0;
}

.boundaries-layout .content-section:last-child {
  margin-bottom: 0;
}

.boundaries-layout .content-section h2 {
  font-size: 22px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--ink);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.boundaries-layout .content-section > p {
  margin-top: 16px;
  font-size: 16px;
  color: var(--ink-soft);
  max-width: 68ch;
}

.boundaries-layout .content-section > p a {
  color: var(--accent);
  border-bottom: 1px solid rgba(184, 135, 74, 0.4);
}

.boundaries-layout .section-figure {
  margin-top: 20px;
  aspect-ratio: 16 / 9;
}

.boundaries-layout .scope-list,
.boundaries-layout .excluded-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.boundaries-layout .scope-list li,
.boundaries-layout .excluded-list li {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
  font-size: 15px;
  color: var(--ink-soft);
}

.boundaries-layout .scope-list li strong {
  display: block;
  color: var(--ink);
  margin-bottom: 4px;
}

.boundaries-layout .excluded-list li {
  border-left: 3px solid var(--line-strong);
}

.boundaries-layout .feedback-steps {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.boundaries-layout .feedback-steps li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
}

.boundaries-layout .feedback-steps .step-no {
  font-size: 14px;
  color: var(--accent);
  padding-top: 2px;
}

.boundaries-layout .feedback-steps .step-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.boundaries-layout .feedback-steps li p {
  grid-column: 2;
  margin-top: 6px;
  font-size: 15px;
  color: var(--ink-soft);
}

.boundaries-layout .feedback-steps li p a {
  color: var(--accent);
  border-bottom: 1px solid rgba(184, 135, 74, 0.4);
}

.boundaries-layout .feedback-section .feedback-note {
  margin-top: 20px;
  padding: 0;
  border: 0;
  background: none;
  font-size: 14px;
  color: var(--ink-soft);
}

.boundaries-layout .content-timeline {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  border-left: 2px solid var(--line);
  padding-left: 20px;
}

.boundaries-layout .content-timeline .timeline-item time {
  font-size: 13px;
  color: var(--accent);
}

.boundaries-layout .content-timeline .timeline-item p {
  margin-top: 6px;
  font-size: 15px;
  color: var(--ink-soft);
}

/* --------------------------------------------------------------------------
   pages · 404
   -------------------------------------------------------------------------- */
.error-main {
  display: flex;
  justify-content: center;
  padding: 80px 24px 96px;
}

.error-inner {
  max-width: 620px;
  text-align: left;
}

.error-code {
  font-size: 56px;
  line-height: 1;
  font-weight: 700;
  color: var(--accent);
}

.error-inner h1 {
  margin-top: 18px;
  font-size: 30px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--ink);
}

.error-text {
  margin-top: 14px;
  font-size: 16px;
  color: var(--ink-soft);
  max-width: 56ch;
}

.error-text + .error-text {
  margin-top: 8px;
}

.error-inner .btn {
  margin-top: 26px;
}

.error-links {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.error-links li {
  min-width: 0;
}

.error-links a {
  display: inline-block;
  padding: 9px 16px;
  font-size: 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background-color: var(--surface);
  color: var(--ink);
}

.error-links a:hover,
.error-links a:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   responsive · 1200px 以下
   -------------------------------------------------------------------------- */
@media (max-width: 1200px) {
  .footer-inner {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

/* --------------------------------------------------------------------------
   responsive · 960px 以下
   -------------------------------------------------------------------------- */
@media (max-width: 960px) {
  .page-layout,
  .sidebar-left .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--gap);
  }

  .layout-aside,
  .sidebar-left .layout-aside {
    position: static;
    order: 0;
  }

  .layout-main,
  .sidebar-left .layout-main,
  .content-main,
  .sidebar-left .content-main {
    order: 0;
  }

  .hero-editorial {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--gap);
  }

  .hero-side {
    order: 2;
  }

  .hero-lead {
    order: 1;
  }

  .boundaries-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .section-channel-list .channel-entry {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--gap);
  }

  .section-channel-list .channel-media {
    max-width: 480px;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

/* --------------------------------------------------------------------------
   responsive · 640px 以下（含 390px 手机）
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
  body {
    font-size: 16px;
  }

  .header-inner {
    padding: 12px 16px;
    flex-wrap: wrap;
    gap: 12px;
  }

  .brand-tag {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex: 1 0 100%;
    margin-left: 0;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding: 8px 0 4px;
    border-top: 1px solid var(--line);
  }

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

  .nav-list a {
    padding: 12px 4px;
    font-size: 16px;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .nav-list a.is-current {
    border-bottom-color: var(--accent);
  }

  .site-main > section,
  .home-main > section {
    padding: 36px 16px;
  }

  .inner-main {
    padding: 0 16px 48px;
  }

  .breadcrumb {
    padding-top: 16px;
  }

  .page-header {
    padding: 16px 0 24px;
    margin-bottom: 28px;
  }

  .page-title,
  .site-h1 {
    font-size: 26px;
  }

  .section-title,
  .section-head .section-title {
    font-size: 21px;
  }

  .boundaries-layout .content-section h2 {
    font-size: 20px;
  }

  .section {
    margin-bottom: 40px;
  }

  .hero-editorial {
    padding-top: 28px;
  }

  .hero-facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-actions {
    gap: 10px;
  }

  .hero-actions .btn {
    flex: 1 1 auto;
    text-align: center;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .overview-media,
  .section-intro .media-figure,
  .fields-overview .media-figure,
  .guide-visual .media-figure {
    aspect-ratio: 16 / 9;
  }

  .channel-overview .channel-row {
    grid-template-columns: 40px minmax(0, 1fr);
    grid-template-areas:
      "no name"
      "no desc"
      "no enter";
    gap: 6px 12px;
    align-items: start;
  }

  .channel-overview .channel-row .channel-no {
    grid-area: no;
  }

  .channel-overview .channel-row .channel-body {
    grid-area: name;
  }

  .channel-overview .channel-row .channel-desc {
    grid-area: desc;
  }

  .channel-overview .channel-row .channel-enter {
    grid-area: enter;
    margin-top: 6px;
  }

  .collection-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .path-overview .path-steps {
    grid-template-columns: minmax(0, 1fr);
  }

  .point-list,
  .verify-list,
  .fields-detail .field-list,
  .compare-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .guide-steps .step-item {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 14px;
    padding: 20px 0;
  }

  .boundaries-layout .feedback-steps li {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 10px;
  }

  .boundaries-layout .feedback-steps li p {
    grid-column: 2;
  }

  .compare-row {
    grid-template-columns: minmax(0, 1fr);
  }

  .compare-cell + .compare-cell {
    border-left: 0;
    border-top: 1px dashed var(--line);
  }

  .compare-head .compare-cell + .compare-cell {
    border-top: 1px solid var(--line);
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    padding: 36px 16px 24px;
    gap: 28px;
  }

  .footer-brand {
    grid-column: auto;
  }

  .footer-col li a,
  .footer-col li {
    min-height: 24px;
  }

  .footer-copy {
    padding: 18px 16px 28px;
  }

  .error-main {
    padding: 56px 16px 64px;
  }

  .error-code {
    font-size: 44px;
  }

  .error-inner h1 {
    font-size: 24px;
  }

  .error-inner .btn {
    width: 100%;
    text-align: center;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .related-list a,
  .related-item a,
  .error-links a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
}

/* --------------------------------------------------------------------------
   responsive · 极窄屏（360px 以下）兜底
   -------------------------------------------------------------------------- */
@media (max-width: 360px) {
  .brand-mark {
    font-size: 18px;
  }

  .page-title,
  .site-h1 {
    font-size: 23px;
  }

  .guide-steps .step-item {
    grid-template-columns: minmax(0, 1fr);
  }

  .guide-steps .step-index {
    padding-top: 0;
  }
}

/* --------------------------------------------------------------------------
   motion · 轻量滚动出现增强（不影响初始可见性）
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  a,
  .btn,
  .collection-card,
  .channel-row {
    transition: none;
  }
}