/* ==========================================================================
   捷华影视 bwnrh.com — 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. base — 变量、重置、基础排版
   -------------------------------------------------------------------------- */
:root {
  --paper: #F4F1EA;
  --paper-deep: #EBE6DB;
  --ink: #14171A;
  --ink-soft: #3A3D40;
  --vermillion: #E0362C;
  --blue: #2B4EFF;
  --mustard: #F2B705;
  --gray: #6F6F68;
  --line: #D8D2C5;
  --line-strong: #B9B2A2;
  --white: #FFFFFF;

  --shell: 1160px;
  --reading: 720px;
  --aside: 300px;
  --gap: 40px;

  --radius: 6px;
  --radius-sm: 4px;

  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Arial, sans-serif;

  --ease: 180ms ease;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.85;
  font-weight: 400;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

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

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

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

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

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

strong {
  font-weight: 700;
}

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 2px;
}

.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;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--ink);
  color: var(--white);
  font-size: 14px;
  border-radius: var(--radius-sm);
  transition: top var(--ease);
}

.skip-link:focus {
  top: 12px;
  color: var(--white);
}

/* --------------------------------------------------------------------------
   2. layout — 全站骨架：页头、主容器、面包屑、标题区、页脚
   -------------------------------------------------------------------------- */

/* 页头 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper);
  border-bottom: 2px solid var(--ink);
}

.header-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 72px;
  display: flex;
  align-items: center;
  gap: 28px;
}

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

.brand-mark {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ink);
}

.brand-sub {
  font-size: 12px;
  font-weight: 400;
  color: var(--gray);
  letter-spacing: 0;
}

.main-nav {
  flex: 1 1 auto;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: wrap;
}

.nav-link {
  display: inline-block;
  padding: 8px 12px;
  font-size: 15px;
  line-height: 1.4;
  color: var(--ink);
  border-radius: var(--radius-sm);
  background-image: linear-gradient(var(--vermillion), var(--vermillion));
  background-repeat: no-repeat;
  background-size: 0 2px;
  background-position: 12px 100%;
  transition: background-size var(--ease), color var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--vermillion);
  background-size: calc(100% - 24px) 2px;
}

.nav-link.is-current {
  background: var(--vermillion);
  color: var(--white);
  background-image: none;
}

.nav-link.is-current:hover {
  color: var(--white);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  margin-left: auto;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  border-radius: var(--radius);
  border: 2px solid var(--ink);
  text-align: center;
  transition: background-color var(--ease), color var(--ease), border-color var(--ease);
}

.btn-primary {
  background: var(--vermillion);
  border-color: var(--vermillion);
  color: var(--white);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--white);
}

.btn-outline {
  background: transparent;
  border-color: var(--ink);
  color: var(--ink);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  background: var(--ink);
  color: var(--white);
}

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: var(--paper-deep);
  border-color: var(--ink);
  color: var(--ink);
}

.header-cta {
  padding: 8px 18px;
  font-size: 14px;
}

/* 汉堡按钮：桌面隐藏 */
.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border: 2px solid var(--ink);
  border-radius: var(--radius-sm);
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  transition: transform var(--ease), opacity var(--ease);
}

/* 移动端导航面板：桌面隐藏 */
.mobile-nav {
  display: none;
}

/* 主内容 */
.site-main {
  display: block;
}

.home-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px 72px;
}

.inner-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 28px 24px 72px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--gray);
  margin-bottom: 18px;
}

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

.breadcrumb a:hover {
  color: var(--vermillion);
  border-bottom-color: var(--vermillion);
}

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

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

/* 页面标题区 */
.page-header {
  margin-bottom: 26px;
}

.page-title {
  font-size: clamp(1.875rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--ink);
  max-width: 900px;
}

/* 内页通用 hero / 导语区 */
.page-hero {
  max-width: 820px;
  margin-bottom: 34px;
}

.section-kicker,
.page-kicker,
.eyebrow,
.hero-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--vermillion);
  border-left: 4px solid var(--vermillion);
  padding-left: 10px;
  line-height: 1.5;
  margin-bottom: 12px;
}

.page-lead {
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: var(--reading);
}

.page-meta,
.meta-line,
.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 14px;
  font-size: 14px;
  color: var(--gray);
}

.meta-row li,
.meta-item {
  position: relative;
  padding-left: 14px;
}

.meta-row li::before,
.meta-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  background: var(--mustard);
}

/* 页脚 */
.site-footer {
  background: var(--ink);
  color: #D9D5CB;
  margin-top: 40px;
}

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 52px 24px 36px;
  display: grid;
  grid-template-columns: minmax(240px, 1fr) minmax(320px, 1.2fr);
  gap: 40px;
}

.footer-brand {
  max-width: 420px;
}

.footer-logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.3;
}

.footer-slogan {
  margin-top: 8px;
  font-size: 15px;
  color: var(--mustard);
}

.footer-desc {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.8;
  color: #B7B2A7;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(140px, 1fr));
  gap: 28px;
}

.footer-nav-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 12px;
}

.footer-nav-list li + li {
  margin-top: 8px;
}

.footer-nav-list a {
  font-size: 14px;
  color: #B7B2A7;
  border-bottom: 1px solid transparent;
}

.footer-nav-list a:hover {
  color: var(--white);
  border-bottom-color: var(--mustard);
}

.footer-boundary {
  border-top: 1px solid #33383C;
}

.footer-boundary p {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 18px 24px;
  font-size: 13px;
  line-height: 1.8;
  color: #9C978C;
}

.footer-bottom {
  border-top: 1px solid #33383C;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 16px 24px 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  font-size: 13px;
  color: #8C877C;
}

.footer-domain {
  color: #B7B2A7;
}

/* --------------------------------------------------------------------------
   3. components — 通用组件
   -------------------------------------------------------------------------- */

/* 区块标题 */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 24px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--ink);
}

.section-title {
  position: relative;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
  padding-left: 14px;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.22em;
  width: 6px;
  height: 1.05em;
  background: var(--vermillion);
}

.section-note,
.section-desc {
  font-size: 14px;
  color: var(--gray);
  max-width: 560px;
  line-height: 1.7;
}

.section-intro {
  font-size: 16px;
  color: var(--ink-soft);
  max-width: var(--reading);
  margin-bottom: 22px;
}

/* 表格 */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.data-table,
.scope-table,
.compare-table {
  width: 100%;
  min-width: 560px;
  font-size: 14px;
}

.data-table caption,
.scope-table caption,
.compare-table caption {
  text-align: left;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--gray);
  border-bottom: 1px solid var(--line);
}

.data-table thead th,
.scope-table thead th,
.compare-table thead th {
  text-align: left;
  padding: 12px 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--white);
  background: var(--ink);
  line-height: 1.5;
}

.data-table tbody th,
.scope-table tbody th,
.compare-table tbody th {
  text-align: left;
  padding: 14px 16px;
  font-weight: 700;
  color: var(--ink);
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.data-table tbody td,
.scope-table tbody td,
.compare-table tbody td {
  padding: 14px 16px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  line-height: 1.7;
}

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

.data-table tbody tr:hover,
.scope-table tbody tr:hover,
.compare-table tbody tr:hover {
  background: var(--paper-deep);
}

/* 图片容器 */
figure {
  margin: 0;
}

.hero-figure,
.topic-figure,
.content-figure,
.report-media,
.guide-figure,
.faq-figure,
.about-figure,
.topic-media {
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--paper-deep);
}

.hero-figure img,
.topic-figure img,
.content-figure img,
.report-media img,
.guide-figure img,
.faq-figure img,
.about-figure img,
.topic-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

figcaption,
.figure-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gray);
}

/* FAQ 折叠项 */
.faq-list {
  display: grid;
  gap: 10px;
}

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

.faq-question {
  position: relative;
  display: block;
  padding: 16px 52px 16px 18px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
  min-height: 44px;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 400;
  color: var(--vermillion);
  line-height: 1;
}

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

.faq-item[open] .faq-question {
  color: var(--vermillion);
}

.faq-answer {
  padding: 0 18px 18px;
  border-top: 1px solid var(--line);
}

.faq-answer p {
  padding-top: 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

/* 返回主站条 */
.back-home-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-top: 40px;
  padding: 18px 22px;
  background: var(--paper-deep);
  border-left: 6px solid var(--vermillion);
  border-radius: var(--radius-sm);
}

.back-home-bar p {
  font-size: 15px;
  color: var(--ink-soft);
}

.back-home-link {
  font-size: 15px;
  font-weight: 700;
  color: var(--vermillion);
  border-bottom: 2px solid var(--vermillion);
}

.back-home-link:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* 相关内容横条 */
.related-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.related-links-label {
  font-weight: 700;
  color: var(--ink);
}

.related-links-item {
  padding: 6px 14px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-soft);
}

.related-links-item:hover {
  border-color: var(--vermillion);
  color: var(--vermillion);
}

/* 文本链接 */
.text-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 700;
  color: var(--vermillion);
  border-bottom: 2px solid var(--vermillion);
  line-height: 1.5;
}

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

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--vermillion);
}

.link-arrow::after {
  content: "→";
  transition: transform var(--ease);
}

.link-arrow:hover {
  color: var(--ink);
}

.link-arrow:hover::after {
  transform: translateX(4px);
}

/* --------------------------------------------------------------------------
   4. pages — 首页
   -------------------------------------------------------------------------- */

/* 首屏海报区 */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr);
  gap: 48px;
  align-items: center;
  padding: 56px 0 48px;
  border-bottom: 2px solid var(--ink);
}

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

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--ink);
  margin-bottom: 20px;
}

.hero-lead {
  font-size: 18px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 560px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.hero-meta {
  margin-top: 22px;
  font-size: 14px;
  color: var(--gray);
  padding-top: 16px;
  border-top: 1px solid var(--line);
  max-width: 560px;
}

.hero-figure {
  border: 2px solid var(--ink);
  aspect-ratio: 4 / 3;
}

/* 频道标签带 */
.channel-strip {
  padding: 40px 0;
  border-bottom: 1px solid var(--line);
}

.strip-wrap {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
}

.strip-track {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scroll-behavior: smooth;
  padding: 4px 2px 10px;
  flex: 1 1 auto;
  min-width: 0;
  scrollbar-width: thin;
}

.strip-track::-webkit-scrollbar {
  height: 6px;
}

.strip-track::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 3px;
}

.chip {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 20px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: 999px;
  white-space: nowrap;
}

.chip:hover,
.chip:focus-visible {
  background: var(--ink);
  color: var(--white);
}

.chip:nth-child(3n + 2):hover {
  background: var(--blue);
  border-color: var(--blue);
}

.chip:nth-child(3n):hover {
  background: var(--vermillion);
  border-color: var(--vermillion);
}

.strip-arrow {
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: 50%;
  line-height: 1;
}

.strip-arrow:hover {
  background: var(--ink);
  color: var(--white);
}

.strip-arrow::before {
  content: "‹";
}

.strip-arrow-next::before {
  content: "›";
}

/* 任务路径三列 */
.task-paths {
  padding: 48px 0;
  border-bottom: 1px solid var(--line);
}

.task-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.task-col {
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 6px solid var(--blue);
  border-radius: var(--radius);
  padding: 22px 22px 24px;
  min-width: 0;
}

.task-col:nth-child(2) {
  border-top-color: var(--vermillion);
}

.task-col:nth-child(3) {
  border-top-color: var(--mustard);
}

.task-col-title {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 14px;
  color: var(--ink);
}

.task-list li + li {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}

.task-list a {
  display: block;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
  padding-left: 16px;
  position: relative;
}

.task-list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 7px;
  height: 7px;
  background: var(--blue);
}

.task-col:nth-child(2) .task-list a::before {
  background: var(--vermillion);
}

.task-col:nth-child(3) .task-list a::before {
  background: var(--mustard);
}

.task-list a:hover {
  color: var(--vermillion);
}

/* 专题精选海报位 */
.topic-feature {
  padding: 48px 0;
  border-bottom: 1px solid var(--line);
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 22px;
}

.topic-card {
  display: flex;
  flex-direction: column;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  min-width: 0;
  transition: border-color var(--ease);
}

.topic-card:hover {
  border-color: var(--ink);
}

.topic-figure {
  aspect-ratio: 3 / 2;
  border-radius: 0;
  border-bottom: 4px solid var(--mustard);
}

.topic-card:nth-child(2) .topic-figure {
  border-bottom-color: var(--blue);
}

.topic-card:nth-child(3) .topic-figure {
  border-bottom-color: var(--vermillion);
}

.topic-card:nth-child(4) .topic-figure {
  border-bottom-color: var(--ink);
}

.topic-body {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  padding: 16px 16px 18px;
}

.topic-name {
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.topic-tags {
  margin-top: 8px;
  font-size: 13px;
  color: var(--vermillion);
  line-height: 1.6;
}

.topic-desc {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray);
  flex: 1 1 auto;
}

.topic-link {
  margin-top: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  align-self: flex-start;
  border-bottom: 2px solid var(--mustard);
  padding-bottom: 2px;
}

.topic-link::after {
  content: "→";
  transition: transform var(--ease);
}

.topic-link:hover {
  color: var(--vermillion);
  border-bottom-color: var(--vermillion);
}

.topic-link:hover::after {
  transform: translateX(4px);
}

/* 题材范围速览表 */
.scope-table-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--line);
}

/* 浏览四步 */
.steps-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--line);
}

.steps-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.step {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 20px 22px;
  min-width: 0;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: 12px;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  background: var(--mustard);
  border-radius: var(--radius-sm);
}

.step-name {
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 8px;
  color: var(--ink);
}

.step-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.steps-foot {
  margin-top: 20px;
  font-size: 15px;
}

.steps-foot a {
  font-weight: 700;
  color: var(--vermillion);
  border-bottom: 2px solid var(--vermillion);
}

.steps-foot a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* 摘要与递进 */
.digest-section {
  padding: 48px 0;
  border-bottom: 1px solid var(--line);
}

.digest-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: var(--gap);
}

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

.digest-col-title {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 14px;
  color: var(--ink);
}

.digest-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.digest-list li + li {
  margin-top: 10px;
}

.digest-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  background: var(--vermillion);
}

.digest-col:last-child .digest-list li::before {
  background: var(--blue);
}

/* 首页 FAQ */
.faq-section {
  padding: 48px 0 8px;
}

.faq-foot {
  margin-top: 20px;
  font-size: 15px;
}

.faq-foot a {
  font-weight: 700;
  color: var(--vermillion);
  border-bottom: 2px solid var(--vermillion);
}

.faq-foot a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* --------------------------------------------------------------------------
   5. pages — 内页通用布局
   -------------------------------------------------------------------------- */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--aside);
  gap: var(--gap);
  align-items: start;
}

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

.content-aside {
  display: flex;
  flex-direction: column;
  gap: 22px;
  min-width: 0;
}

.aside-block {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}

.aside-title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 2px solid var(--mustard);
}

.aside-block p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.aside-link-list li + li {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

.aside-link-list a {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  padding-left: 14px;
  position: relative;
}

.aside-link-list a::before {
  content: "›";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--vermillion);
  font-weight: 700;
}

.aside-link-list a:hover {
  color: var(--vermillion);
}

/* 内页 section 通用 */
.section {
  margin-bottom: 40px;
}

.section > p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: var(--reading);
  margin-bottom: 18px;
}

/* --------------------------------------------------------------------------
   6. pages — 频道分类 channels.html
   -------------------------------------------------------------------------- */

.page-channels .page-hero {
  padding-bottom: 26px;
  border-bottom: 2px solid var(--ink);
  max-width: none;
}

.page-channels .section-intro {
  margin-top: 4px;
}

.content-figure {
  margin: 22px 0;
  border: 1px solid var(--line);
  aspect-ratio: 16 / 9;
}

.channel-row {
  display: grid;
  grid-template-columns: minmax(180px, 240px) minmax(0, 1fr);
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

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

.channel-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
}

.channel-index {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  background: var(--mustard);
  border-radius: var(--radius-sm);
}

.channel-name {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

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

.channel-body p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.channel-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  margin-top: 12px;
}

.channel-links a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 5px 14px;
  font-size: 13px;
  color: var(--ink);
  background: var(--paper-deep);
  border: 1px solid var(--line);
  border-radius: 999px;
}

.channel-links a:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--white);
}

.cross-list {
  margin-top: 16px;
  display: grid;
  gap: 10px;
}

.cross-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.cross-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  background: var(--blue);
}

.page-channels .back-home-bar {
  margin-top: 32px;
}

/* --------------------------------------------------------------------------
   7. pages — 专题片单 features.html
   -------------------------------------------------------------------------- */

.page-container {
  min-width: 0;
}

.page-features .page-hero {
  margin-bottom: 30px;
}

.content-section {
  margin-bottom: 38px;
}

.content-section > h2 {
  position: relative;
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
  padding-left: 14px;
  margin-bottom: 14px;
}

.content-section > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.22em;
  width: 6px;
  height: 1.05em;
  background: var(--vermillion);
}

.content-section > p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: var(--reading);
}

.content-section > p + p {
  margin-top: 12px;
}

/* 专题条目块 */
.topic-entry {
  display: grid;
  grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
  gap: 24px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  min-width: 0;
}

.topic-entry:last-of-type {
  border-bottom: 1px solid var(--line);
}

.topic-media {
  aspect-ratio: 4 / 3;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.topic-entry .topic-body {
  padding: 0;
  min-width: 0;
}

.topic-entry .topic-name {
  font-size: 1.1875rem;
}

.topic-entry .topic-desc {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.topic-entry .topic-tags {
  margin-top: 10px;
}

.topic-entry .topic-link {
  margin-top: 16px;
}

/* 阅读顺序建议 */
.order-list {
  counter-reset: order;
  display: grid;
  gap: 12px;
  margin-top: 4px;
}

.order-list li {
  counter-increment: order;
  position: relative;
  padding: 14px 16px 14px 58px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.order-list li::before {
  content: counter(order, decimal-leading-zero);
  position: absolute;
  left: 16px;
  top: 14px;
  font-size: 16px;
  font-weight: 700;
  color: var(--vermillion);
  line-height: 1.8;
}

.order-list strong {
  color: var(--ink);
}

/* 专题侧栏 */
.aside-block .btn {
  margin-top: 14px;
}

.aside-block .btn-outline {
  min-height: 40px;
  padding: 8px 16px;
  font-size: 14px;
}

/* --------------------------------------------------------------------------
   8. pages — 专题说明 topic-report.html
   -------------------------------------------------------------------------- */

.page-head {
  margin-bottom: 28px;
}

.page-title-block {
  max-width: 860px;
}

.page-topic-report .page-header {
  margin-bottom: 18px;
}

.layout-shell {
  align-items: start;
}

.main-column {
  min-width: 0;
  max-width: 100%;
}

/* 执行摘要 */
.executive-summary {
  border-left: 8px solid var(--vermillion);
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px 26px;
  margin-bottom: 28px;
}

.executive-summary h2 {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
  margin-bottom: 12px;
}

.summary-body p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.summary-body p + p {
  margin-top: 10px;
}

.summary-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.summary-meta-item {
  min-width: 0;
  padding: 12px 14px;
  background: var(--paper);
  border-radius: var(--radius-sm);
}

.summary-meta-item dt {
  font-size: 13px;
  color: var(--gray);
  margin-bottom: 4px;
}

.summary-meta-item dd {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--ink);
}

/* 页内目录条 */
.toc-bar {
  position: sticky;
  top: 84px;
  z-index: 20;
  margin-bottom: 28px;
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 6px 0;
}

.toc-list {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.toc-list::-webkit-scrollbar {
  height: 5px;
}

.toc-list::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 3px;
}

.toc-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 6px 16px;
  font-size: 14px;
  font-weight: 700;
  color: var(--ink-soft);
  border-radius: 999px;
  white-space: nowrap;
}

.toc-link:hover,
.toc-link.is-active {
  background: var(--ink);
  color: var(--white);
}

/* 报告分段 */
.report-section {
  margin-bottom: 34px;
  max-width: var(--reading);
}

.report-section h2 {
  position: relative;
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
  padding-left: 14px;
  margin-bottom: 14px;
  scroll-margin-top: 150px;
}

.report-section h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.22em;
  width: 6px;
  height: 1.05em;
  background: var(--blue);
}

.report-section > p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.report-section > p + p {
  margin-top: 12px;
}

.report-media {
  margin: 18px 0;
  border: 1px solid var(--line);
  aspect-ratio: 16 / 9;
}

.report-points {
  margin-top: 16px;
  display: grid;
  gap: 10px;
}

.report-points li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.report-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 8px;
  background: var(--mustard);
}

.report-section .table-wrap {
  margin: 16px 0;
}

/* 来源说明 */
.source-note {
  margin-top: 16px;
  padding: 18px 20px;
  background: var(--paper-deep);
  border-radius: var(--radius);
}

.source-note p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.source-points {
  margin-top: 12px;
  display: grid;
  gap: 8px;
}

.source-points li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--gray);
}

.source-points li::before {
  content: "·";
  position: absolute;
  left: 2px;
  top: 0;
  font-weight: 700;
  color: var(--vermillion);
}

/* 结论块 */
.conclusion-block {
  max-width: var(--reading);
  background: var(--blue);
  color: var(--white);
  border-radius: var(--radius);
  padding: 24px 26px;
  margin-bottom: 8px;
}

.conclusion-block h2 {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
  margin-bottom: 10px;
}

.conclusion-block p {
  font-size: 15px;
  line-height: 1.85;
  color: #E7EAFF;
}

.btn-conclusion {
  margin-top: 16px;
  background: var(--white);
  border-color: var(--white);
  color: var(--blue);
}

.btn-conclusion:hover,
.btn-conclusion:focus-visible {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--white);
}

/* 报告侧栏 */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 22px;
  min-width: 0;
}

.sidebar-block {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
}

.sidebar-block h2 {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 2px solid var(--mustard);
}

.sidebar-links li + li {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
}

.sidebar-links a {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  padding-left: 14px;
  position: relative;
}

.sidebar-links a::before {
  content: "›";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--vermillion);
  font-weight: 700;
}

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

.sidebar-checklist {
  display: grid;
  gap: 10px;
}

.sidebar-checklist li {
  position: relative;
  padding-left: 24px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.sidebar-checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.42em;
  width: 12px;
  height: 12px;
  border: 2px solid var(--blue);
  border-radius: 2px;
}

.sidebar-more {
  display: inline-block;
  margin-top: 12px;
  font-size: 14px;
  font-weight: 700;
  color: var(--vermillion);
  border-bottom: 2px solid var(--vermillion);
}

.sidebar-more:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.page-topic-report .back-home-bar {
  margin-top: 32px;
}

/* --------------------------------------------------------------------------
   9. pages — 观看指南 guide.html
   -------------------------------------------------------------------------- */

.page-guide .page-hero {
  margin-bottom: 26px;
}

.guide-figure {
  max-width: var(--reading);
  margin-bottom: 32px;
  border: 1px solid var(--line);
  aspect-ratio: 16 / 9;
}

.reading-column {
  max-width: 760px;
}

.guide-steps,
.checklist-block,
.device-tips,
.mismatch-block,
.guide-tips {
  margin-bottom: 40px;
}

.reading-column h2 {
  position: relative;
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
  padding-left: 14px;
  margin-bottom: 12px;
  scroll-margin-top: 100px;
}

.reading-column h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.22em;
  width: 6px;
  height: 1.05em;
  background: var(--vermillion);
}

/* 四步路径 */
.step-block {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  grid-template-areas:
    "num name"
    "num desc"
    "num link";
  column-gap: 18px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.step-block:last-of-type {
  border-bottom: 1px solid var(--line);
}

.guide-steps .step-num {
  grid-area: num;
  align-self: start;
  width: 48px;
  height: 48px;
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  background: var(--mustard);
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.guide-steps .step-name {
  grid-area: name;
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  margin-bottom: 6px;
}

.guide-steps .step-desc {
  grid-area: desc;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.guide-steps .text-link {
  grid-area: link;
  margin-top: 10px;
  justify-self: start;
}

/* 核验清单 */
.checklist {
  display: grid;
  gap: 12px;
  margin-top: 6px;
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 4px solid var(--blue);
  border-radius: var(--radius-sm);
}

.check-box {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin-top: 4px;
  border: 2px solid var(--blue);
  border-radius: 2px;
  background: var(--white);
}

.check-text {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  min-width: 0;
}

.check-text strong {
  display: block;
  color: var(--ink);
  margin-bottom: 2px;
}

.checklist-note {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--gray);
  padding: 12px 16px;
  background: var(--paper-deep);
  border-radius: var(--radius-sm);
}

/* 设备提示两列 */
.tips-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.tips-col {
  min-width: 0;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.tips-title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--mustard);
}

.tips-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.tips-list li + li {
  margin-top: 8px;
}

.tips-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 7px;
  background: var(--vermillion);
}

/* 处理方式 */
.mismatch-item {
  padding: 18px 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.mismatch-item + .mismatch-item {
  margin-top: 12px;
}

.mismatch-title {
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  margin-bottom: 6px;
}

.mismatch-item p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.mismatch-item .text-link {
  margin-top: 10px;
}

/* 页尾小贴士 */
.tips-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  padding: 20px;
  background: var(--paper-deep);
  border-radius: var(--radius);
}

.tips-pair-col {
  min-width: 0;
}

.tips-pair-note {
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-guide .back-home-bar {
  max-width: 760px;
}

/* --------------------------------------------------------------------------
   10. pages — 常见问题 faq.html
   -------------------------------------------------------------------------- */

.page-faq .page-head {
  padding-bottom: 24px;
  border-bottom: 2px solid var(--ink);
  margin-bottom: 30px;
}

.container {
  min-width: 0;
}

.faq-layout {
  max-width: 820px;
}

.faq-tabs {
  margin-bottom: 22px;
}

.faq-tab-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.faq-tab-list::-webkit-scrollbar {
  height: 5px;
}

.faq-tab-list::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border-radius: 3px;
}

.faq-tab {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 20px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  background: var(--white);
  border: 2px solid var(--ink);
  border-radius: 999px;
  white-space: nowrap;
}

.faq-tab:hover {
  background: var(--ink);
  color: var(--white);
}

.faq-figure {
  margin-bottom: 30px;
  border: 1px solid var(--line);
  aspect-ratio: 16 / 9;
}

.faq-group {
  margin-bottom: 36px;
}

.faq-group .section-head {
  display: block;
  border-bottom: 1px solid var(--line);
  margin-bottom: 16px;
  padding-bottom: 10px;
}

.faq-group .section-head h2 {
  position: relative;
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
  padding-left: 14px;
  margin-bottom: 8px;
  scroll-margin-top: 100px;
}

.faq-group .section-head h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.22em;
  width: 6px;
  height: 1.05em;
  background: var(--vermillion);
}

/* --------------------------------------------------------------------------
   11. pages — 关于本站 about.html
   -------------------------------------------------------------------------- */

.page-about .page-hero {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 2px solid var(--ink);
  max-width: none;
}

.about-section {
  margin-bottom: 44px;
  max-width: 860px;
}

.about-section > .section-title {
  margin-bottom: 16px;
}

.about-positioning {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
  gap: 28px;
  align-items: start;
  margin-bottom: 22px;
}

.about-positioning-text {
  min-width: 0;
}

.about-positioning-text p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.about-positioning-text p + p {
  margin-top: 12px;
}

.about-figure {
  border: 1px solid var(--line);
  aspect-ratio: 4 / 3;
}

.scope-list {
  display: grid;
  gap: 10px;
}

.scope-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 9px;
  height: 9px;
  background: var(--blue);
}

/* 整理准则双栏 */
.principles-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.principles-col {
  min-width: 0;
  padding: 20px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--white);
  border-top: 6px solid var(--blue);
}

.principles-dont {
  border-top-color: var(--vermillion);
}

.principles-title {
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  margin-bottom: 12px;
}

.principles-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.principles-list li + li {
  margin-top: 10px;
}

.principles-do .principles-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--blue);
  font-weight: 700;
}

.principles-dont .principles-list li::before {
  content: "×";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--vermillion);
  font-weight: 700;
}

/* 术语定义列表 */
.term-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.term-item {
  min-width: 0;
  padding: 14px 18px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 4px solid var(--mustard);
  border-radius: var(--radius-sm);
}

.term-item dt {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 4px;
}

.term-item dd {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.locale-note {
  margin-top: 16px;
  font-size: 14px;
  color: var(--gray);
  line-height: 1.8;
}

/* 反馈说明 */
.feedback-list {
  display: grid;
  gap: 10px;
  margin-bottom: 18px;
}

.feedback-list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.feedback-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 9px;
  height: 9px;
  background: var(--mustard);
}

.feedback-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  font-size: 15px;
}

.feedback-links a {
  font-weight: 700;
  color: var(--vermillion);
  border-bottom: 2px solid var(--vermillion);
  padding-bottom: 1px;
}

.feedback-links a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.page-about .back-home-bar {
  margin-top: 20px;
}

/* --------------------------------------------------------------------------
   12. pages — 404
   -------------------------------------------------------------------------- */

.site-error .site-main {
  min-height: 56vh;
}

.error-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 64px 24px 72px;
}

.error-block {
  max-width: 640px;
  padding: 36px 32px;
  background: var(--white);
  border: 2px solid var(--ink);
  border-left: 10px solid var(--vermillion);
  border-radius: var(--radius);
}

.error-code {
  font-size: 64px;
  font-weight: 700;
  line-height: 1;
  color: var(--vermillion);
  margin-bottom: 12px;
}

.error-block h1 {
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
  margin-bottom: 12px;
}

.error-lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.error-note {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.8;
  color: var(--gray);
}

.error-links {
  max-width: 640px;
  margin-top: 34px;
}

.error-links h2 {
  position: relative;
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
  padding-left: 14px;
  margin-bottom: 14px;
}

.error-links h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.22em;
  width: 6px;
  height: 1.05em;
  background: var(--mustard);
}

.error-link-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.error-link-list a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.error-link-list a:hover {
  border-color: var(--vermillion);
  color: var(--vermillion);
}

/* --------------------------------------------------------------------------
   13. responsive — 1024px / 720px
   -------------------------------------------------------------------------- */

@media (max-width: 1024px) {
  .header-inner {
    gap: 16px;
  }

  .nav-link {
    padding: 8px 9px;
    font-size: 14px;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    gap: 32px;
    padding: 44px 0 40px;
  }

  .task-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .topic-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

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

  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }

  .content-aside,
  .sidebar {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }

  .summary-meta {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .toc-bar {
    position: static;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 16px;
    line-height: 1.8;
  }

  .header-inner {
    min-height: 64px;
    padding: 0 16px;
    gap: 12px;
    flex-wrap: wrap;
  }

  .brand-mark {
    font-size: 19px;
  }

  .brand-sub {
    font-size: 11px;
  }

  .header-actions {
    gap: 8px;
  }

  .header-cta {
    display: none;
  }

  /* 移动端：显示汉堡，主导航列表默认收起 */
  .nav-toggle {
    display: inline-flex;
  }

  .main-nav {
    flex: 0 0 auto;
  }

  .nav-list {
    display: none;
  }

  .nav-list.is-open {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding: 6px 0 10px;
    border-top: 1px solid var(--line);
  }

  .nav-list.is-open .nav-link {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: 10px 12px;
    font-size: 16px;
    border-radius: var(--radius-sm);
    background-image: none;
  }

  .nav-list.is-open .nav-link.is-current {
    background: var(--vermillion);
    color: var(--white);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  /* 移动端导航面板 */
  .mobile-nav:not([hidden]) {
    display: block;
    background: var(--paper);
    border-bottom: 2px solid var(--ink);
    max-height: 70vh;
    overflow-y: auto;
  }

  .mobile-nav-list {
    max-width: var(--shell);
    margin: 0 auto;
    padding: 8px 16px 14px;
  }

  .mobile-nav-list li + li {
    border-top: 1px solid var(--line);
  }

  .mobile-nav-list a {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: 10px 4px;
    font-size: 16px;
    color: var(--ink);
  }

  .mobile-nav-list a:hover {
    color: var(--vermillion);
  }

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

  .inner-main {
    padding-top: 20px;
    padding-bottom: 52px;
  }

  .page-title {
    font-size: 1.75rem;
    line-height: 1.3;
  }

  .page-lead {
    font-size: 16px;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
    padding: 32px 0 30px;
  }

  .hero-title {
    font-size: clamp(2rem, 9vw, 2.5rem);
    line-height: 1.15;
    margin-bottom: 14px;
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-actions {
    gap: 10px;
    margin-top: 20px;
  }

  .hero-actions .btn {
    flex: 1 1 auto;
  }

  .hero-figure {
    aspect-ratio: 16 / 10;
  }

  .section-head {
    display: block;
  }

  .section-title {
    font-size: 1.25rem;
    margin-bottom: 8px;
  }

  .section-note,
  .section-desc {
    font-size: 13px;
  }

  .channel-strip,
  .task-paths,
  .topic-feature,
  .scope-table-section,
  .steps-section,
  .digest-section,
  .faq-section {
    padding: 32px 0;
  }

  .strip-arrow {
    width: 40px;
    height: 40px;
    font-size: 18px;
  }

  .chip {
    padding: 8px 16px;
    font-size: 14px;
  }

  .task-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .task-col {
    padding: 18px 18px 20px;
  }

  .topic-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

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

  .steps-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .step {
    display: grid;
    grid-template-columns: 44px minmax(0, 1fr);
    column-gap: 14px;
    align-items: start;
    padding: 16px 18px;
  }

  .step-num {
    grid-row: 1 / span 2;
    width: 40px;
    height: 40px;
    margin-bottom: 0;
    font-size: 17px;
  }

  .step-name {
    grid-column: 2;
    margin-bottom: 4px;
  }

  .step-desc {
    grid-column: 2;
  }

  .digest-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  /* 表格转条目 */
  .table-wrap {
    overflow-x: visible;
    border: 0;
    background: transparent;
  }

  .scope-table,
  .data-table,
  .compare-table {
    min-width: 0;
    display: block;
  }

  .scope-table caption,
  .data-table caption,
  .compare-table caption {
    display: block;
    padding: 0 0 10px;
    border: 0;
    background: transparent;
  }

  .scope-table thead,
  .data-table thead,
  .compare-table thead {
    display: none;
  }

  .scope-table tbody,
  .data-table tbody,
  .compare-table tbody {
    display: grid;
    gap: 12px;
  }

  .scope-table tbody tr,
  .data-table tbody tr,
  .compare-table tbody tr {
    display: block;
    background: var(--white);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 14px 16px;
  }

  .scope-table tbody th,
  .data-table tbody th,
  .compare-table tbody th {
    display: block;
    padding: 0 0 8px;
    border-bottom: 1px solid var(--line);
    margin-bottom: 8px;
    font-size: 15px;
  }

  .scope-table tbody td,
  .data-table tbody td,
  .compare-table tbody td {
    display: block;
    padding: 6px 0;
    border: 0;
    font-size: 14px;
  }

  .scope-table tbody td::before,
  .data-table tbody td::before,
  .compare-table tbody td::before {
    content: attr(data-label);
    display: block;
    font-size: 12px;
    font-weight: 700;
    color: var(--gray);
    margin-bottom: 2px;
  }

  .scope-table tbody tr:hover,
  .data-table tbody tr:hover,
  .compare-table tbody tr:hover {
    background: var(--white);
  }

  /* 内页布局 */
  .page-hero {
    margin-bottom: 26px;
  }

  .page-layout {
    gap: 26px;
  }

  .content-aside,
  .sidebar {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .channel-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
    padding: 18px 0;
  }

  .channel-links a {
    min-height: 40px;
  }

  .topic-entry {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
    padding: 18px 0;
  }

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

  .summary-meta {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .executive-summary {
    padding: 20px 18px;
    border-left-width: 6px;
  }

  .toc-list {
    gap: 4px;
  }

  .toc-link {
    padding: 6px 13px;
    font-size: 13px;
  }

  .reading-column {
    max-width: 100%;
  }

  .step-block {
    grid-template-columns: 44px minmax(0, 1fr);
    column-gap: 14px;
    padding: 16px 0;
  }

  .guide-steps .step-num {
    width: 40px;
    height: 40px;
    font-size: 17px;
  }

  .tips-columns,
  .tips-pair {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .tips-pair {
    padding: 16px;
  }

  .faq-layout {
    max-width: 100%;
  }

  .faq-figure {
    aspect-ratio: 16 / 10;
  }

  .faq-question {
    padding: 14px 44px 14px 16px;
    font-size: 15px;
  }

  .faq-answer {
    padding: 0 16px 16px;
  }

  .about-positioning {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

  .principles-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .term-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .back-home-bar {
    padding: 16px 18px;
    margin-top: 30px;
  }

  .back-home-bar .btn {
    width: 100%;
  }

  .related-links {
    gap: 8px 12px;
  }

  .related-links-item {
    padding: 6px 12px;
    font-size: 13px;
  }

  .error-main {
    padding: 36px 16px 48px;
  }

  .error-block {
    padding: 26px 20px;
    border-left-width: 8px;
  }

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

  .error-actions .btn {
    flex: 1 1 auto;
  }

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

  /* 页脚 */
  .footer-inner {
    padding: 36px 16px 26px;
    gap: 26px;
  }

  .footer-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .footer-boundary p {
    padding: 16px;
    font-size: 12px;
  }

  .footer-bottom {
    padding: 14px 16px 24px;
    gap: 6px 18px;
    font-size: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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