/* ==========================================================================
   busybeems.com — 企业影像制作服务官网样式表
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. base — 变量、重置、排版基础
   -------------------------------------------------------------------------- */

:root {
  --paper: #F6F2EA;
  --panel: #FFFFFF;
  --ink: #1A1917;
  --ink-soft: #4A4640;
  --accent: #B4462B;
  --accent-deep: #9C3A22;
  --rule: #D8D2C6;
  --rule-soft: #E7E2D8;
  --radius: 6px;
  --radius-sm: 4px;
  --shell: 1180px;
  --text-col: 760px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", Arial, sans-serif;
  --font-num: "SFMono-Regular", "JetBrains Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

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

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

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  letter-spacing: 0;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--ink);
  line-height: 1.3;
  font-weight: 700;
}

h1 {
  font-size: 34px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

p {
  margin: 0;
}

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

dl,
dd,
dt {
  margin: 0;
}

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

figure {
  margin: 0;
}

figcaption {
  margin-top: 10px;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.6;
}

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

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

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

caption {
  text-align: left;
  color: var(--ink-soft);
  font-size: 14px;
  padding-bottom: 10px;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: 12px;
  z-index: 60;
  padding: 8px 14px;
  background: var(--ink);
  color: #fff;
  border-radius: var(--radius-sm);
  transform: translateY(-200%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
  color: #fff;
}

/* --------------------------------------------------------------------------
   2. layout — 容器、页头、页脚、骨架
   -------------------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

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

/* ---- 页头：上层信息条 ---- */

.site-header {
  background-color: var(--paper);
  border-bottom: 1px solid var(--rule);
  position: relative;
  z-index: 30;
}

.header-top {
  border-bottom: 1px solid var(--rule-soft);
}

.header-top-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 52px;
  padding-top: 8px;
  padding-bottom: 8px;
}

.brand {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}

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

.brand-slogan {
  flex: 1 1 auto;
  min-width: 0;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.5;
  border-left: 1px solid var(--rule);
  padding-left: 20px;
}

.header-quick {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.header-quick a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 4px 12px;
  font-size: 14px;
  color: var(--ink-soft);
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  background-color: var(--panel);
}

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

.header-quick a.is-current {
  color: var(--accent);
  border-color: var(--accent);
}

/* ---- 页头：主导航层 ---- */

.header-main {
  background-color: var(--paper);
}

.header-main-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 60px;
}

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

.main-nav ul {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
}

.main-nav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 44px;
  padding: 6px 10px;
  font-size: 15px;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
}

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

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

.nav-index {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rule);
}

.main-nav a.is-current .nav-index,
.main-nav a:hover .nav-index {
  color: var(--accent);
}

/* ---- 汉堡按钮 ---- */

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  padding: 11px 10px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-sm);
  background-color: var(--panel);
  flex-direction: column;
  justify-content: space-between;
}

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

/* ---- 主内容 ---- */

.site-main {
  flex: 1 1 auto;
  display: block;
  padding-bottom: 72px;
}

.inner-main {
  padding-top: 0;
}

/* ---- 面包屑 ---- */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 16px 20px 0;
  font-size: 14px;
  color: var(--ink-soft);
}

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

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

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

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

/* ---- 内页标题区 ---- */

.page-header {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 18px 20px 20px;
  border-bottom: 1px solid var(--rule);
}

.page-title {
  font-size: 34px;
  font-weight: 700;
  color: var(--ink);
  max-width: var(--text-col);
}

/* ---- 页脚 ---- */

.site-footer {
  background-color: var(--paper);
  border-top: 1px solid var(--rule);
  padding: 48px 0 28px;
}

.footer-inner {
  display: block;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--rule);
}

.footer-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

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

.footer-col a {
  display: inline-block;
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.5;
  padding: 2px 0;
}

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

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  padding-top: 20px;
  font-size: 14px;
  color: var(--ink-soft);
}

.footer-brand {
  font-weight: 700;
  color: var(--ink);
}

.footer-copy {
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 13px;
  color: var(--ink-soft);
}

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

/* ---- 区块与标题 ---- */

.section {
  padding: 56px 0;
}

.section + .section {
  border-top: 1px solid var(--rule-soft);
}

.section-head {
  max-width: var(--text-col);
  margin-bottom: 28px;
}

.section-index {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 8px;
}

.section-head h2,
.section-title {
  font-size: 22px;
  margin-bottom: 10px;
}

.section-desc,
.section-lead,
.section-note {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
  max-width: var(--text-col);
}

.section-lead {
  margin-bottom: 28px;
}

.section-footnote {
  margin-top: 24px;
  font-size: 15px;
}

.section-footnote a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent);
  padding-bottom: 1px;
}

.section-footnote a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ---- 按钮 ---- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--radius);
  border: 1px solid transparent;
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
  color: #fff;
  background-color: var(--accent-deep);
  border-color: var(--accent-deep);
  transform: translateY(-1px);
}

.btn-ghost,
.btn-secondary {
  background-color: var(--panel);
  color: var(--ink);
  border-color: var(--rule);
}

.btn-ghost:hover,
.btn-ghost:focus-visible,
.btn-secondary:hover,
.btn-secondary:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.link-more,
.line-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

.link-more:hover,
.line-link:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ---- 折叠问答 ---- */

.faq-list,
.qa-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: var(--text-col);
  border-top: 1px solid var(--rule);
}

.faq-item,
.qa-item {
  border-bottom: 1px solid var(--rule);
}

.faq-item summary,
.qa-question {
  position: relative;
  display: block;
  padding: 16px 40px 16px 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-item summary::after,
.qa-question::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-num);
  font-size: 18px;
  color: var(--accent);
}

.faq-item[open] summary::after,
.qa-item[open] .qa-question::after {
  content: "–";
}

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

.faq-item > p,
.qa-answer {
  padding: 0 40px 18px 0;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
}

.qa-answer p + p {
  margin-top: 10px;
}

/* ---- 表格 ---- */

.table-wrap,
.table-scroll,
.compare-table-wrap {
  overflow-x: auto;
  background-color: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.compare-table,
.mapping-table {
  font-size: 15px;
  line-height: 1.6;
  min-width: 640px;
}

.compare-table th,
.compare-table td,
.mapping-table th,
.mapping-table td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--rule-soft);
}

.compare-table thead th,
.mapping-table thead th {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  background-color: var(--paper);
  border-bottom: 1px solid var(--rule);
  white-space: nowrap;
}

.compare-table tbody th,
.mapping-table tbody th {
  font-weight: 700;
  color: var(--ink);
}

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

.compare-table td,
.mapping-table td {
  color: var(--ink-soft);
}

/* ---- 相关链接列表 ---- */

.related-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.related-list > li {
  display: block;
  background-color: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.related-list > li > a {
  display: block;
  font-weight: 700;
  color: var(--ink);
}

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

.related-list > li > p {
  margin-top: 8px;
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.related-name {
  display: block;
  font-weight: 700;
  color: var(--ink);
}

.related-desc {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.related-list > li > a:hover .related-name {
  color: var(--accent);
}

/* ---- 图片容器统一约束 ---- */

.hero-media,
.capability-media,
.line-figure,
.industry-group-media,
.archive-figure,
.qa-figure,
.coop-media,
.confirm-media,
.media-figure {
  background-color: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 10px;
}

.hero-media img,
.capability-media img,
.line-figure img,
.industry-group-media img,
.archive-figure img,
.qa-figure img,
.coop-media img,
.confirm-media img,
.media-figure img {
  width: 100%;
  height: 100%;
  min-height: 220px;
  max-height: 420px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background-color: var(--rule-soft);
}

/* ---- 锚点偏移 ---- */

[id] {
  scroll-margin-top: 84px;
}

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

/* ---- 首屏 ---- */

.hero {
  padding: 40px 0 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.hero-copy {
  max-width: 560px;
  padding-top: 8px;
}

.hero-kicker {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 14px;
}

.hero-copy h1 {
  font-size: 34px;
  margin-bottom: 18px;
}

.hero-lead {
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 26px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 30px;
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 24px;
  border-top: 1px solid var(--rule);
  padding-top: 20px;
}

.hero-meta-item dt {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 6px;
}

.hero-meta-item dd {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.hero-media img {
  min-height: 300px;
  max-height: 460px;
}

/* ---- 站内目录索引带 ---- */

.index-band {
  margin-top: 40px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.index-band ul {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.index-band li {
  border-right: 1px solid var(--rule-soft);
}

.index-band li:last-child {
  border-right: 0;
}

.index-band a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  min-height: 44px;
}

.index-band a:hover {
  background-color: var(--panel);
}

.index-num {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.index-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.index-desc {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.65;
}

/* ---- 业务总览 ---- */

.line-list {
  border-top: 1px solid var(--rule);
}

.line-item {
  border-bottom: 1px solid var(--rule);
}

.line-item article {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) minmax(0, 220px);
  gap: 8px 24px;
  align-items: baseline;
  padding: 22px 0;
}

.line-num {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.line-name {
  font-size: 18px;
  margin-bottom: 8px;
}

.line-scene {
  grid-column: 2;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
  margin-bottom: 6px;
}

.line-note {
  grid-column: 2;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.7;
}

.line-item .link-more {
  grid-column: 3;
  grid-row: 1 / span 3;
  align-self: center;
  justify-self: end;
}

/* ---- 能力摘要 ---- */

.capability-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.capability-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  border-top: 1px solid var(--rule);
  padding-top: 20px;
}

.capability-list h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.capability-list p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
}

/* ---- 制作流程五段 ---- */

.route-bar {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background-color: var(--panel);
  border-left: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow: hidden;
}

.route-bar li {
  padding: 22px 18px;
  border-right: 1px solid var(--rule-soft);
}

.route-bar li:last-child {
  border-right: 0;
}

.route-num {
  display: block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 10px;
}

.route-name {
  font-size: 16px;
  margin-bottom: 8px;
}

.route-output {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.65;
}

/* ---- 行业版图速览 ---- */

.industry-tags {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

.industry-tags li {
  display: flex;
}

.industry-tags a {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  min-height: 44px;
  padding: 16px 18px;
  background-color: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.industry-tags a:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.tag-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.industry-tags a:hover .tag-name {
  color: var(--accent);
}

.tag-desc {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.65;
}

/* ---- 首页对比摘要 ---- */

.section-compare .compare-table {
  min-width: 560px;
}

/* ---- 影像类型档案索引 ---- */

.archive-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.archive-list a {
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  min-height: 44px;
  padding: 20px;
  background-color: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.archive-list a:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.archive-num {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.archive-list .archive-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.archive-list a:hover .archive-name {
  color: var(--accent);
}

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

/* ---- 合作洽谈入口 ---- */

.coop-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.coop-steps {
  display: flex;
  flex-direction: column;
  gap: 18px;
  border-top: 1px solid var(--rule);
  padding-top: 20px;
}

.coop-steps li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 14px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--rule-soft);
}

.coop-steps li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.coop-steps .step-num {
  grid-row: 1 / span 2;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent);
  padding-top: 2px;
}

.coop-steps h3 {
  font-size: 17px;
}

.coop-steps p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
}

/* --------------------------------------------------------------------------
   5. pages — 内页通用区块
   -------------------------------------------------------------------------- */

.page-hero,
.page-title-section,
.page-head,
.page-title-block {
  padding: 28px 0 8px;
}

.page-summary,
.page-lede,
.page-lead {
  max-width: var(--text-col);
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.8;
}

.page-index {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 10px;
}

.page-hero .section-index,
.page-title-section .section-index,
.page-head .section-index,
.page-title-block .section-index {
  margin-bottom: 10px;
}

/* --------------------------------------------------------------------------
   6. pages — 影像业务目录
   -------------------------------------------------------------------------- */

.phenomenon-picker {
  padding: 40px 0 8px;
}

.phenomenon-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.phenomenon-item a {
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  min-height: 44px;
  padding: 18px 20px;
  background-color: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.phenomenon-item a:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.phenomenon-index {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.phenomenon-text {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.65;
}

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

.phenomenon-map {
  font-size: 14px;
  color: var(--ink-soft);
}

.line-decisions {
  padding: 44px 0 8px;
}

.line-decisions .line-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
  gap: 32px;
  align-items: start;
  padding: 32px 0;
  border-bottom: 1px solid var(--rule);
}

.line-decisions .line-item:first-of-type {
  border-top: 1px solid var(--rule);
}

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

.line-index {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 10px;
}

.line-body h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.line-body .line-scene {
  color: var(--ink);
  font-size: 15px;
  line-height: 1.75;
  margin-bottom: 10px;
}

.line-focus,
.line-deliver {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
  margin-bottom: 8px;
}

.line-body .line-link {
  margin-top: 8px;
}

.line-figure img {
  min-height: 220px;
  max-height: 300px;
}

.deliver-pair {
  padding: 44px 0 8px;
}

.deliver-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.deliver-col {
  background-color: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 22px 24px;
}

.deliver-col h3 {
  font-size: 17px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule-soft);
}

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

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

.deliver-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 1px;
  background-color: var(--accent);
}

.related-links {
  padding: 44px 0 0;
}

/* --------------------------------------------------------------------------
   7. pages — 行业版图
   -------------------------------------------------------------------------- */

.industry-index-section {
  padding: 36px 0 8px;
}

.industry-index-section .section-title,
.industry-groups-section .section-title,
.industry-mapping-section .section-title,
.related-section .section-title {
  margin-bottom: 10px;
}

.industry-index-section .section-desc,
.industry-mapping-section .section-desc {
  margin-bottom: 20px;
}

.industry-index-section .industry-tags a {
  flex-direction: row;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
}

.tag-index {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.industry-groups-section {
  padding: 44px 0 8px;
}

.industry-group {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 380px);
  gap: 32px;
  align-items: start;
  padding: 32px 0;
  border-bottom: 1px solid var(--rule);
}

.industry-group:first-of-type {
  border-top: 1px solid var(--rule);
}

.industry-group-text {
  min-width: 0;
}

.group-index {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 10px;
}

.industry-group-text h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.group-demand {
  color: var(--ink);
  font-size: 15px;
  line-height: 1.75;
  margin-bottom: 10px;
}

.group-focus {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
  margin-bottom: 14px;
}

.group-points {
  display: flex;
  flex-direction: column;
  gap: 8px;
  border-top: 1px solid var(--rule-soft);
  padding-top: 14px;
}

.group-points li {
  position: relative;
  padding-left: 16px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.7;
}

.group-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 1px;
  background-color: var(--accent);
}

.industry-group-media img {
  min-height: 220px;
  max-height: 300px;
}

.industry-mapping-section {
  padding: 44px 0 8px;
}

.mapping-note {
  margin-top: 18px;
  font-size: 15px;
  color: var(--ink-soft);
}

.mapping-note a {
  color: var(--accent);
  border-bottom: 1px solid var(--accent);
  padding-bottom: 1px;
}

.mapping-note a + a {
  margin-left: 16px;
}

.mapping-note a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.related-section {
  padding: 44px 0 0;
}

/* --------------------------------------------------------------------------
   8. pages — 制作路径
   -------------------------------------------------------------------------- */

.route-overview,
.route-detail,
.route-media,
.route-checklist,
.route-pitfalls {
  padding: 44px 0 8px;
}

.route-steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background-color: var(--panel);
  overflow: hidden;
}

.route-steps li {
  border-right: 1px solid var(--rule-soft);
}

.route-steps li:last-child {
  border-right: 0;
}

.route-steps a {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 44px;
  padding: 20px 16px;
}

.route-steps a:hover {
  background-color: var(--paper);
}

.step-index {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.step-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.route-steps a:hover .step-name {
  color: var(--accent);
}

.stage-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding: 28px 0;
  border-bottom: 1px solid var(--rule);
}

.stage-block:first-of-type {
  border-top: 1px solid var(--rule);
}

.stage-text {
  min-width: 0;
  max-width: var(--text-col);
}

.stage-index {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 10px;
}

.stage-text h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.stage-text > p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 16px;
}

.stage-meta {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 8px 20px;
  border-top: 1px solid var(--rule-soft);
  padding-top: 14px;
}

.stage-meta dt {
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.stage-meta dd {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.route-media .media-figure img {
  min-height: 260px;
  max-height: 420px;
}

.checklist-cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.checklist-col {
  background-color: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 22px 24px;
}

.checklist-col h3 {
  font-size: 17px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule-soft);
}

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

.checklist li {
  position: relative;
  padding-left: 16px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.7;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 1px;
  background-color: var(--accent);
}

.pitfall-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.pitfall-list li {
  background-color: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 20px 22px;
}

.pitfall-list h3 {
  font-size: 16px;
  margin-bottom: 10px;
}

.pitfall-list p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
}

.related-links.section {
  padding: 44px 0 0;
}

nav.related-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--rule-soft);
  font-size: 14px;
}

.related-links-label {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.related-links-item {
  color: var(--ink-soft);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1px;
}

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

/* --------------------------------------------------------------------------
   9. pages — 制作方式对比
   -------------------------------------------------------------------------- */

.page-layout {
  display: block;
}

.page-layout-inner {
  display: block;
}

.conclusion-block,
.compare-block,
.advice-block,
.confirm-block,
.related-block {
  padding: 40px 0 8px;
}

.conclusion-block h2,
.compare-block h2,
.advice-block h2,
.confirm-block h2,
.related-block h2 {
  font-size: 22px;
  margin-bottom: 10px;
}

.section-note {
  margin-bottom: 20px;
}

.conclusion-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.conclusion-list li {
  background-color: var(--panel);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 18px 20px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
}

.conclusion-index {
  display: block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 8px;
}

.advice-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: var(--text-col);
}

.advice-list li {
  position: relative;
  padding: 4px 0 4px 18px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.8;
  border-left: 1px solid var(--rule);
}

.advice-list li::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 14px;
  width: 8px;
  height: 2px;
  background-color: var(--accent);
}

.confirm-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 420px);
  gap: 32px;
  align-items: start;
}

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

.confirm-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  border-top: 1px solid var(--rule);
  padding-top: 16px;
}

.confirm-list li {
  position: relative;
  padding-left: 18px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
}

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

.confirm-media img {
  min-height: 240px;
  max-height: 320px;
}

/* --------------------------------------------------------------------------
   10. pages — 影像类型档案
   -------------------------------------------------------------------------- */

.archive-index {
  padding: 36px 0 8px;
}

.archive-index h2,
.archive-entries h2,
.format-fit h2,
.related-links h2 {
  font-size: 22px;
  margin-bottom: 16px;
}

.archive-index-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.archive-index-list a {
  display: flex;
  flex-direction: column;
  gap: 6px;
  height: 100%;
  min-height: 44px;
  padding: 16px 18px;
  background-color: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}

.archive-index-list a:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.archive-no {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.archive-index-list .archive-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.archive-index-list a:hover .archive-name {
  color: var(--accent);
}

.archive-meta {
  font-size: 14px;
  color: var(--ink-soft);
}

.archive-entries {
  padding: 44px 0 8px;
}

.archive-entry {
  display: grid;
  grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
  padding: 32px 0;
  border-bottom: 1px solid var(--rule);
}

.archive-entry:first-of-type {
  border-top: 1px solid var(--rule);
}

.archive-figure img {
  min-height: 220px;
  max-height: 280px;
}

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

.archive-body .archive-no {
  margin-bottom: 10px;
}

.archive-body h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.archive-body > p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 16px;
}

.archive-spec {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 8px 20px;
  border-top: 1px solid var(--rule-soft);
  padding-top: 14px;
}

.archive-spec dt {
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.archive-spec dd {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.7;
}

.format-fit {
  padding: 44px 0 8px;
}

.format-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.format-list li {
  background-color: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 18px 20px;
}

.format-name {
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.format-use {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   11. pages — 影像问答
   -------------------------------------------------------------------------- */

.qa-nav-section {
  padding: 32px 0 8px;
}

.qa-nav-section .section-title {
  margin-bottom: 14px;
}

.qa-nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

.qa-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 14px 18px;
  background-color: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.qa-nav a:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

.qa-nav-index {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.qa-group {
  padding: 40px 0 8px;
}

.qa-group .section-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 22px;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
}

.qa-group .section-title .section-index {
  margin-bottom: 0;
}

.qa-figure {
  margin-bottom: 24px;
}

.qa-figure img {
  min-height: 200px;
  max-height: 300px;
}

/* --------------------------------------------------------------------------
   12. pages — 合作洽谈
   -------------------------------------------------------------------------- */

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 320px);
  gap: 44px;
  align-items: start;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 24px 20px 0;
}

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

.page-sidebar {
  min-width: 0;
  position: sticky;
  top: 24px;
  background-color: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 24px 22px;
}

.page-sidebar h2 {
  font-size: 18px;
  margin-bottom: 10px;
}

.sidebar-desc {
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 18px;
}

.confirm-group + .confirm-group {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--rule-soft);
}

.confirm-group h3 {
  font-size: 15px;
  margin-bottom: 10px;
  color: var(--ink);
}

.coop-prep {
  padding: 32px 0 8px;
}

.coop-prep h2,
.coop-agenda h2,
.coop-related h2 {
  font-size: 22px;
  margin-bottom: 10px;
}

.coop-prep .section-desc,
.coop-agenda .section-desc,
.coop-related .section-desc {
  margin-bottom: 20px;
}

.coop-prep-body {
  display: grid;
  grid-template-columns: minmax(0, 380px) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.coop-media img {
  min-height: 220px;
  max-height: 300px;
}

.prep-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  border-top: 1px solid var(--rule);
  padding-top: 18px;
}

.prep-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 4px 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--rule-soft);
}

.prep-item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.prep-num {
  grid-row: 1 / span 2;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent);
  padding-top: 2px;
}

.prep-item h3 {
  font-size: 17px;
}

.prep-item p {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
}

.coop-agenda {
  padding: 40px 0 8px;
}

.agenda-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--rule);
}

.agenda-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 4px 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--rule);
}

.agenda-step {
  grid-row: 1 / span 2;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent);
  padding-top: 3px;
}

.agenda-item h3 {
  font-size: 17px;
}

.agenda-goal {
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
}

.coop-related {
  padding: 40px 0 0;
}

.sidebar-links {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--rule-soft);
}

.sidebar-links h3 {
  font-size: 15px;
  margin-bottom: 12px;
}

.sidebar-links ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sidebar-links a {
  display: inline-block;
  min-height: 24px;
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.6;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1px;
}

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

/* --------------------------------------------------------------------------
   13. pages — 404
   -------------------------------------------------------------------------- */

.error-main {
  padding: 72px 0 88px;
}

.error-hero {
  max-width: var(--text-col);
}

.error-code {
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 14px;
}

.error-hero h1 {
  font-size: 34px;
  margin-bottom: 16px;
}

.error-lead {
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 28px;
}

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

.error-links {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--rule);
}

.error-links h2 {
  font-size: 20px;
  margin-bottom: 18px;
}

.error-links ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.error-links a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 14px 18px;
  background-color: var(--panel);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  font-size: 15px;
  color: var(--ink);
}

.error-links a:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

/* --------------------------------------------------------------------------
   14. responsive — 900px 断点
   -------------------------------------------------------------------------- */

@media (max-width: 900px) {

  h1,
  .page-title,
  .error-hero h1,
  .hero-copy h1 {
    font-size: 28px;
  }

  .header-top-inner {
    flex-wrap: wrap;
    gap: 10px 16px;
    padding-top: 12px;
    padding-bottom: 12px;
  }

  .brand-slogan {
    order: 3;
    flex: 1 1 100%;
    border-left: 0;
    padding-left: 0;
    border-top: 1px solid var(--rule-soft);
    padding-top: 10px;
  }

  .header-quick {
    margin-left: auto;
  }

  /* 移动端主导航抽屉：只收起 .nav-list 自身 */

  .nav-toggle {
    display: flex;
  }

  .header-main-inner {
    justify-content: flex-end;
  }

  .main-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background-color: var(--paper);
    border-bottom: 1px solid var(--rule);
    border-top: 1px solid var(--rule);
    z-index: 40;
  }

  .main-nav .nav-list {
    display: none;
    max-height: 520px;
    overflow-y: auto;
    flex-direction: column;
    align-items: stretch;
    flex-wrap: nowrap;
    gap: 0;
    padding: 8px 20px 16px;
  }

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

  .main-nav li {
    border-bottom: 1px solid var(--rule-soft);
  }

  .main-nav li:last-child {
    border-bottom: 0;
  }

  .main-nav a {
    justify-content: flex-start;
    min-height: 48px;
    padding: 10px 4px 10px 10px;
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

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

  .main-nav a:hover {
    border-left-color: var(--accent);
    border-bottom-color: transparent;
  }

  /* 页面结构 */

  .hero-inner,
  .capability-inner,
  .coop-inner,
  .confirm-layout,
  .coop-prep-body {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .hero-copy {
    max-width: none;
  }

  .hero-media img {
    min-height: 220px;
    max-height: 320px;
  }

  .index-band ul {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .index-band li:nth-child(2n) {
    border-right: 0;
  }

  .index-band li:nth-child(-n + 2) {
    border-bottom: 1px solid var(--rule-soft);
  }

  .line-item article {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 6px 16px;
  }

  .line-scene,
  .line-note {
    grid-column: 2;
  }

  .line-item .link-more {
    grid-column: 2;
    grid-row: auto;
    align-self: start;
    justify-self: start;
    margin-top: 6px;
  }

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

  .route-bar li,
  .route-steps li {
    border-right: 1px solid var(--rule-soft);
    border-bottom: 1px solid var(--rule-soft);
  }

  .route-bar li:nth-child(2n),
  .route-steps li:nth-child(2n) {
    border-right: 0;
  }

  .route-bar li:last-child,
  .route-steps li:last-child {
    border-bottom: 0;
  }

  .line-decisions .line-item,
  .industry-group,
  .archive-entry {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

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

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

  .footer-copy {
    margin-left: 0;
    flex: 1 1 100%;
  }

  /* 合作洽谈：侧栏移到正文之后 */

  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding-top: 20px;
  }

  .page-sidebar {
    position: static;
  }

  /* 对比表收窄 */

  .compare-table,
  .mapping-table {
    min-width: 0;
  }
}

/* --------------------------------------------------------------------------
   15. responsive — 640px 断点
   -------------------------------------------------------------------------- */

@media (max-width: 640px) {

  body {
    font-size: 15px;
  }

  h1,
  .page-title,
  .error-hero h1,
  .hero-copy h1 {
    font-size: 26px;
  }

  h2,
  .section-head h2,
  .section-title,
  .conclusion-block h2,
  .compare-block h2,
  .advice-block h2,
  .confirm-block h2,
  .related-block h2,
  .archive-index h2,
  .archive-entries h2,
  .format-fit h2,
  .related-links h2,
  .qa-group .section-title,
  .coop-prep h2,
  .coop-agenda h2,
  .coop-related h2 {
    font-size: 20px;
  }

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

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

  .section,
  .phenomenon-picker,
  .line-decisions,
  .deliver-pair,
  .related-links,
  .industry-index-section,
  .industry-groups-section,
  .industry-mapping-section,
  .related-section,
  .route-overview,
  .route-detail,
  .route-media,
  .route-checklist,
  .route-pitfalls,
  .conclusion-block,
  .compare-block,
  .advice-block,
  .confirm-block,
  .related-block,
  .archive-index,
  .archive-entries,
  .format-fit,
  .qa-nav-section,
  .qa-group,
  .coop-prep,
  .coop-agenda,
  .coop-related {
    padding-top: 32px;
  }

  .hero {
    padding-top: 24px;
  }

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

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

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

  .index-band li {
    border-right: 0;
    border-bottom: 1px solid var(--rule-soft);
  }

  .index-band li:last-child {
    border-bottom: 0;
  }

  .line-item article {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

  .line-num,
  .line-scene,
  .line-note,
  .line-item .link-more {
    grid-column: 1;
  }

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

  .route-bar li,
  .route-steps li {
    border-right: 0;
  }

  .route-bar li:last-child,
  .route-steps li:last-child {
    border-bottom: 0;
  }

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

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .stage-meta,
  .archive-spec {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .stage-meta dd,
  .archive-spec dd {
    margin-bottom: 10px;
  }

  .prep-item,
  .agenda-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .prep-num,
  .agenda-step {
    grid-row: auto;
    padding-top: 0;
  }

  .coop-steps li {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .coop-steps .step-num {
    grid-row: auto;
    padding-top: 0;
  }

  .faq-item > p,
  .qa-answer {
    padding-right: 8px;
  }

  .error-main {
    padding: 48px 0 64px;
  }
}