/* ==========================================================================
   天美传媒国产 · 企业影像内容制作服务
   全局样式表
   分组：base / layout / components / pages / responsive
   ========================================================================== */

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

:root {
  --ink: #252b27;
  --ink-soft: #6b746d;
  --pine: #173f35;
  --pine-deep: #0f2c25;
  --paper: #f5f1e8;
  --paper-raised: #fffdf8;
  --sand: #d8c6a5;
  --sand-soft: #ece2cf;
  --brick: #b44d32;
  --brick-soft: #f0dcd4;
  --line: #dcd4c4;
  --line-strong: #c4b9a4;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-soft: 0 1px 2px rgba(23, 63, 53, 0.06), 0 8px 24px rgba(23, 63, 53, 0.05);
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "SFMono-Regular", "Consolas", "Menlo", monospace;
  --shell: 1180px;
  --shell-header: 1320px;
  --gutter: 24px;
}

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

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

body.site-body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.32;
  color: var(--pine);
}

p {
  margin: 0;
}

ul,
ol,
dl {
  margin: 0;
  padding: 0;
}

li {
  list-style: none;
}

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

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

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--brick);
  outline-offset: 3px;
}

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

figure {
  margin: 0;
}

figcaption {
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

button {
  font-family: inherit;
}

table {
  border-collapse: collapse;
}

.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;
}

/* --------------------------------------------------------------------------
   2. layout —— 页头、主导航、主容器、页脚骨架
   -------------------------------------------------------------------------- */

/* 页头 */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--pine);
  border-bottom: 1px solid rgba(216, 198, 165, 0.22);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: var(--shell-header);
  min-height: 76px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.brand {
  flex: 0 0 auto;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--paper);
  padding: 12px 0;
}

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

/* 主导航 */
.site-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: flex-end;
}

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

.nav-list li {
  display: block;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 11px;
  font-size: 15px;
  line-height: 1.4;
  color: rgba(245, 241, 232, 0.82);
  border-bottom: 2px solid transparent;
}

.nav-list a:hover {
  color: #fff;
  border-bottom-color: var(--sand);
}

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

/* 汉堡按钮（桌面隐藏） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  background-color: transparent;
  border: 1px solid rgba(245, 241, 232, 0.4);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

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

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

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

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 22px 0 6px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-soft);
}

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

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

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

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

/* 页面标题区 */
.page-header {
  padding: 10px 0 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 34px;
}

.page-title {
  max-width: 20em;
  font-family: var(--font-serif);
  font-size: 38px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--pine);
}

/* 页脚 */
.site-footer {
  background-color: var(--pine-deep);
  color: rgba(245, 241, 232, 0.78);
  padding: 56px 0 40px;
  margin-top: 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) minmax(0, 1.6fr);
  gap: 36px;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.footer-title {
  margin-bottom: 14px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--sand);
  letter-spacing: 0;
}

.footer-list li {
  margin-bottom: 8px;
}

.footer-list a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 15px;
  color: rgba(245, 241, 232, 0.78);
  border-bottom: 1px solid transparent;
}

.footer-list a:hover {
  color: #fff;
  border-bottom-color: var(--sand);
}

.footer-about {
  padding-left: 28px;
  border-left: 1px solid rgba(216, 198, 165, 0.2);
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 19px;
  color: var(--paper);
  margin-bottom: 10px;
}

.footer-text {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 241, 232, 0.66);
}

.footer-copy {
  margin-top: 12px;
  font-size: 13px;
  color: rgba(245, 241, 232, 0.5);
}

/* --------------------------------------------------------------------------
   3. components —— 通用按钮、区块头、列表、表格、折叠、关联入口
   -------------------------------------------------------------------------- */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.4;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

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

.btn-primary:hover {
  background-color: #9c3f28;
  border-color: #9c3f28;
  color: #fff;
}

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

.btn-ghost:hover {
  border-color: var(--pine);
  color: var(--brick);
}

.btn-link {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  padding: 0 6px;
  font-size: 15px;
  color: var(--pine);
  border-bottom: 1px solid var(--line-strong);
}

.btn-link:hover {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

/* 区块头（首页） */
.section-head {
  max-width: 720px;
  margin-bottom: 32px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--pine);
}

.section-desc {
  margin-top: 10px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* 通用段落 / 引导语（内页） */
.page-heading {
  margin-bottom: 36px;
}

.page-heading .container,
.page-heading-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0;
}

.page-heading-inner {
  padding: 0;
}

.eyebrow,
.page-eyebrow,
.page-kicker {
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0;
  color: var(--brick);
}

.page-lead {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
}

.section-note,
.section-intro,
.section-lead {
  max-width: 68ch;
  margin-top: 10px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.section-intro,
.section-lead {
  margin-bottom: 24px;
}

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

/* 表格容器横向滚动（防止窄屏溢出） */
.table-scroll,
.checklist-table-wrap {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--paper-raised);
}

.table-scroll table,
.checklist-table-wrap table {
  width: 100%;
  min-width: 560px;
  font-size: 15px;
  line-height: 1.7;
}

.table-scroll caption,
.checklist-table-wrap caption {
  text-align: left;
}

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

.table-scroll thead th,
.checklist-table-wrap thead th {
  background-color: var(--sand-soft);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--pine);
  white-space: nowrap;
}

.table-scroll tbody th,
.checklist-table-wrap tbody th {
  font-weight: 600;
  color: var(--pine);
  background-color: rgba(216, 198, 165, 0.18);
  white-space: nowrap;
}

.table-scroll tbody tr:last-child th,
.table-scroll tbody tr:last-child td,
.checklist-table-wrap tbody tr:last-child th,
.checklist-table-wrap tbody tr:last-child td {
  border-bottom: 0;
}

/* 折叠问答（首页与 FAQ 共用细节，作用域分开） */
.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-question {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  min-height: 52px;
  padding: 16px 0;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--pine);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.4;
  color: var(--brick);
}

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

.faq-answer {
  padding: 0 0 18px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

/* 页内关联入口条 */
.related-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  max-width: var(--shell);
  margin: 40px auto 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
}

.related-links-label {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink-soft);
}

.related-links-item {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 12px;
  font-size: 14px;
  color: var(--pine);
  background-color: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

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

/* --------------------------------------------------------------------------
   4. pages —— 首页与各内页业务模块
   -------------------------------------------------------------------------- */

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

/* 首屏操作面 */
.hero-workbench {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 44px var(--gutter) 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.06fr);
  gap: 44px;
  align-items: start;
}

.hero-copy {
  padding-top: 12px;
}

.hero-eyebrow {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--brick);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: 44px;
  font-weight: 600;
  line-height: 1.24;
  color: var(--pine);
}

.hero-lead {
  margin-top: 18px;
  max-width: 34em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
}

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

.hero-figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--sand-soft);
}

.hero-figure img {
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.hero-caption {
  padding: 10px 14px;
  background-color: var(--paper-raised);
  border-top: 1px solid var(--line);
}

/* 三类项目起点面板 */
.start-panels {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 34px;
}

.start-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px 20px;
  background-color: var(--paper-raised);
  border: 1px solid var(--line);
  border-top: 3px solid var(--sand);
  border-radius: var(--radius);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.start-panel:hover {
  border-color: var(--line-strong);
  border-top-color: var(--brick);
  transform: translateY(-2px);
}

.start-index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--brick);
}

.start-title {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--pine);
}

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

.start-link {
  margin-top: auto;
  padding-top: 8px;
  font-size: 14px;
  color: var(--pine);
  border-bottom: 1px solid var(--line-strong);
  align-self: flex-start;
}

.start-link:hover {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

/* 首屏下方内容图 */
.content-media {
  margin-top: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--sand-soft);
}

.content-media img {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.content-media figcaption {
  padding: 10px 16px;
  background-color: var(--paper-raised);
  border-top: 1px solid var(--line);
}

/* 服务范围索引 */
.service-index {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 64px var(--gutter) 0;
}

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

.service-row {
  display: grid;
  grid-template-columns: 56px minmax(0, 1.1fr) minmax(0, 1.6fr) auto;
  align-items: center;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.service-num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--brick);
}

.service-name {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--pine);
}

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

.service-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  font-size: 14px;
  color: var(--pine);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.service-link:hover {
  color: var(--brick);
  border-color: var(--brick);
}

/* 四阶段协作路径 */
.workflow-track {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 64px var(--gutter) 0;
}

.track-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.track-stage {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 18px;
  background-color: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.stage-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--brick);
}

.stage-name {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--pine);
}

.stage-detail {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 10px;
  font-size: 14px;
  line-height: 1.7;
}

.stage-detail dt {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  padding-top: 2px;
}

.stage-detail dd {
  margin: 0;
  color: var(--ink);
}

.stage-pause {
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px dashed var(--line-strong);
  font-size: 13px;
  line-height: 1.7;
  color: var(--brick);
}

/* 素材 / 交付 双栏 */
.material-split,
.delivery-split {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 64px var(--gutter) 0;
}

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

.split-col {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 26px 24px;
  background-color: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.split-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--pine);
}

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

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

.split-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  background-color: var(--sand);
  border-radius: 50%;
}

.split-link {
  margin-top: auto;
  align-self: flex-start;
  padding-top: 6px;
  font-size: 14px;
  color: var(--pine);
  border-bottom: 1px solid var(--line-strong);
}

.split-link:hover {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

.delivery-note {
  margin-top: 16px;
  padding: 14px 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  background-color: var(--sand-soft);
  border-left: 3px solid var(--brick);
  border-radius: var(--radius-sm);
}

/* 常见问题预览 */
.faq-preview {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 64px var(--gutter) 0;
}

.faq-list {
  max-width: 860px;
  border-top: 1px solid var(--line-strong);
}

.faq-more {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 20px;
  font-size: 15px;
  color: var(--pine);
  border-bottom: 1px solid var(--line-strong);
}

.faq-more:hover {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

/* 合作说明通栏 */
.engagement-band {
  margin-top: 64px;
  background-color: var(--pine);
  color: var(--paper);
}

.engagement-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
  gap: 40px;
  align-items: center;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px var(--gutter);
}

.engagement-copy .section-title {
  color: var(--paper);
}

.engagement-desc {
  margin-top: 12px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.8);
}

.engagement-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin-top: 18px;
}

.engagement-points li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(245, 241, 232, 0.9);
}

.engagement-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  background-color: var(--sand);
  border-radius: 50%;
}

.engagement-action {
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: flex-start;
  padding-left: 32px;
  border-left: 1px solid rgba(216, 198, 165, 0.28);
}

.engagement-hint {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 241, 232, 0.72);
}

/* ===== 用途图谱页 ===== */
.use-summary {
  margin-bottom: 52px;
}

.use-summary-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 36px;
  align-items: start;
}

.use-summary-text h2 {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 14px;
}

.use-summary-text p {
  margin-bottom: 14px;
  font-size: 16px;
  line-height: 1.85;
}

.use-summary-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.use-summary-links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  font-size: 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background-color: var(--paper-raised);
}

.use-summary-links a:hover {
  border-color: var(--brick);
  color: var(--brick);
}

.use-summary-media {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--sand-soft);
}

.use-summary-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.use-summary-media figcaption {
  padding: 10px 14px;
  background-color: var(--paper-raised);
  border-top: 1px solid var(--line);
}

/* 五种用途索引 */
.use-index {
  margin-bottom: 52px;
}

.use-index h2,
.use-detail h2,
.selection-method h2,
.related-paths h2 {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--pine);
}

.use-index-list {
  margin-top: 20px;
  border-top: 1px solid var(--line-strong);
}

.use-index-row {
  display: grid;
  grid-template-columns: 48px minmax(0, 0.9fr) minmax(0, 1.8fr) auto;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.use-index-num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--brick);
}

.use-index-name {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--pine);
}

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

.use-index-row a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 12px;
  font-size: 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.use-index-row a:hover {
  border-color: var(--brick);
  color: var(--brick);
}

/* 用途详情带 */
.use-detail {
  margin-bottom: 52px;
}

.use-detail-item {
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.use-detail-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 16px;
}

.use-detail-num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--brick);
}

.use-detail-head h3 {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--pine);
}

.use-detail-fields {
  display: grid;
  grid-template-columns: 110px minmax(0, 1fr);
  gap: 10px 22px;
  max-width: 900px;
}

.use-detail-fields dt {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--pine);
  padding-top: 2px;
}

.use-detail-fields dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}

/* 选择方法双列 */
.selection-method {
  margin-bottom: 52px;
}

.selection-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 22px;
}

.selection-col {
  padding: 24px 22px;
  background-color: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.selection-col h3 {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.45;
  margin-bottom: 14px;
}

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

.selection-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.75;
}

.selection-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  background-color: var(--sand);
  border-radius: 50%;
}

/* 关联路径（用途图谱 / 交付 / FAQ） */
.related-paths {
  margin-bottom: 8px;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.related-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  background-color: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color 0.18s ease;
}

.related-item:hover {
  border-color: var(--line-strong);
}

.related-item h3 {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--pine);
}

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

.related-item a {
  margin-top: auto;
  align-self: flex-start;
  padding-top: 4px;
  font-size: 14px;
  border-bottom: 1px solid var(--line-strong);
}

.related-item a:hover {
  border-bottom-color: var(--brick);
}

/* ===== 服务范围页 ===== */
.service-workbench {
  margin-bottom: 56px;
}

.workbench-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.35fr) minmax(0, 0.9fr);
  gap: 22px;
  align-items: start;
  margin-top: 24px;
}

.workbench-figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--sand-soft);
}

.workbench-figure img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.workbench-figure figcaption {
  padding: 10px 14px;
  background-color: var(--paper-raised);
  border-top: 1px solid var(--line);
}

.workbench-list {
  padding: 22px;
  background-color: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.workbench-subtitle {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--pine);
  margin-bottom: 14px;
}

.service-catalog {
  display: flex;
  flex-direction: column;
}

.service-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

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

.service-no {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--brick);
  padding-top: 3px;
}

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

.service-body .service-name {
  display: block;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--pine);
  margin-bottom: 4px;
}

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

.workbench-note {
  padding: 22px;
  background-color: var(--sand-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.note-text {
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 14px;
}

.note-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-bottom: 18px;
}

.note-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
}

.note-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 5px;
  height: 5px;
  background-color: var(--brick);
  border-radius: 50%;
}

.note-link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 14px;
  border-bottom: 1px solid var(--line-strong);
}

.note-link:hover {
  border-bottom-color: var(--brick);
}

/* 场景产出表 */
.scenario-outputs {
  margin-bottom: 56px;
}

.scenario-table {
  width: 100%;
}

.scenario-table th,
.scenario-table td {
  font-size: 15px;
}

.section-footnote {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.section-footnote a {
  border-bottom: 1px solid var(--line-strong);
}

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

/* 服务边界 */
.boundary-band {
  margin-bottom: 56px;
}

.boundary-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.boundary-item {
  padding: 20px 20px 18px;
  background-color: var(--paper-raised);
  border: 1px solid var(--line);
  border-left: 3px solid var(--brick);
  border-radius: var(--radius);
}

.boundary-name {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--pine);
  margin-bottom: 8px;
}

.boundary-text,
.boundary-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

/* ===== 协作流程页 ===== */
.workflow-summary {
  margin-bottom: 56px;
}

.summary-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 36px;
  align-items: start;
  margin-bottom: 28px;
}

.summary-text h2 {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 14px;
}

.summary-text p {
  margin-bottom: 14px;
  font-size: 16px;
  line-height: 1.85;
}

.summary-points {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-top: 6px;
}

.summary-points li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.75;
}

.summary-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  background-color: var(--sand);
  border-radius: 50%;
}

.summary-figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--sand-soft);
}

.summary-figure img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.summary-figure figcaption {
  padding: 10px 14px;
  background-color: var(--paper-raised);
  border-top: 1px solid var(--line);
}

/* 节点条 */
.node-bar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--paper-raised);
}

.node-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-right: 1px solid var(--line);
}

.node-item:last-child {
  border-right: 0;
}

.node-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: #fff;
  background-color: var(--pine);
  padding: 2px 7px;
  border-radius: 2px;
}

.node-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--pine);
}

/* 阶段轨道 */
.stage-track {
  margin-bottom: 56px;
}

.stage-track h2,
.pause-table h2,
.related-paths h2 {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--pine);
}

.stage-block {
  margin-top: 26px;
  padding: 24px;
  background-color: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.stage-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 14px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.stage-head .stage-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: #fff;
  background-color: var(--brick);
  padding: 2px 8px;
  border-radius: 2px;
}

.stage-head h3 {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--pine);
}

.stage-tag {
  margin-left: auto;
  font-size: 13px;
  color: var(--ink-soft);
}

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

.stage-col h4 {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--pine);
  margin-bottom: 10px;
}

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

.stage-col li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink);
}

.stage-col li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 5px;
  height: 5px;
  background-color: var(--sand);
  border-radius: 50%;
}

.stage-block .stage-pause {
  margin-top: 18px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-strong);
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.stage-block .stage-pause a {
  border-bottom: 1px solid var(--line-strong);
  margin-left: 4px;
}

.stage-block .stage-pause a:hover {
  border-bottom-color: var(--brick);
}

/* 确认节点表 */
.pause-table {
  margin-bottom: 56px;
}

.node-table {
  width: 100%;
  min-width: 620px;
  font-size: 15px;
}

.node-table caption {
  text-align: left;
  font-size: 13px;
  color: var(--ink-soft);
  padding-bottom: 8px;
}

/* 下一步入口 */
.path-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.path-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px;
  background-color: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.path-item a {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.path-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--brick);
}

.path-name {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--pine);
}

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

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

.path-item:hover {
  border-color: var(--line-strong);
}

/* ===== 素材与规范页 ===== */
.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  align-items: start;
}

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

.article-media {
  margin-bottom: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--sand-soft);
}

.article-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.article-media figcaption {
  padding: 10px 14px;
  background-color: var(--paper-raised);
  border-top: 1px solid var(--line);
}

.material-category {
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.material-category h2 {
  font-family: var(--font-serif);
  font-size: 23px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--pine);
  margin-bottom: 12px;
}

.material-category p {
  font-size: 16px;
  line-height: 1.85;
  margin-bottom: 10px;
}

.material-category p:last-child {
  margin-bottom: 0;
}

/* 双方职责双栏 */
.responsibility-split {
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.responsibility-split h2 {
  font-family: var(--font-serif);
  font-size: 23px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--pine);
  margin-bottom: 10px;
}

.responsibility-split > p {
  font-size: 16px;
  line-height: 1.85;
  margin-bottom: 18px;
}

.split-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.split-columns .split-col {
  padding: 20px;
  background-color: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.split-columns .split-col h3 {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--pine);
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.client-col {
  border-top: 3px solid var(--sand);
}

.maker-col {
  border-top: 3px solid var(--pine);
}

/* 内容规范 */
.norms-detail {
  padding: 26px 0 0;
}

.norms-detail h2 {
  font-family: var(--font-serif);
  font-size: 23px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--pine);
  margin-bottom: 10px;
}

.norms-detail > p {
  font-size: 16px;
  line-height: 1.85;
  margin-bottom: 16px;
}

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

.norms-list li {
  padding: 14px 16px;
  font-size: 15px;
  line-height: 1.8;
  background-color: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.norms-list strong {
  display: block;
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 600;
  color: var(--pine);
  margin-bottom: 4px;
}

/* 右侧检查提示 */
.check-aside {
  position: sticky;
  top: 96px;
  padding: 22px 20px;
  background-color: var(--sand-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.aside-title {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--pine);
  margin-bottom: 10px;
}

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

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

.check-list li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--line-strong);
}

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

.check-item {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.65;
  color: var(--pine);
}

.check-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-soft);
}

.aside-note {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--line-strong);
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.aside-note a {
  border-bottom: 1px solid var(--line-strong);
}

.aside-note a:hover {
  border-bottom-color: var(--brick);
}

/* ===== 交付与验收页（左侧索引 + 主内容） ===== */
.sidebar-left {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.delivery-index {
  position: sticky;
  top: 96px;
  padding: 22px 20px;
  background-color: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.index-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.index-list li {
  border-bottom: 1px solid var(--line);
}

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

.index-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  font-size: 15px;
  color: var(--pine);
}

.index-list a:hover {
  color: var(--brick);
}

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

.delivery-figure {
  margin-bottom: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--sand-soft);
}

.delivery-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.delivery-figure figcaption {
  padding: 10px 14px;
  background-color: var(--paper-raised);
  border-top: 1px solid var(--line);
}

.deliverables,
.acceptance-checks,
.revision-boundary {
  margin-bottom: 44px;
}

.deliverables .section-title,
.acceptance-checks .section-title,
.revision-boundary .section-title,
.delivery-main .related-paths .section-title {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--pine);
}

.deliverable-list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line-strong);
  margin-top: 18px;
}

.deliverable-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.deliverable-name {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--pine);
  margin-bottom: 6px;
}

.deliverable-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

/* 交付页验收表：窄屏容器横向滚动，表格自身不被视口裁切 */
.check-table {
  width: 100%;
  min-width: 520px;
  font-size: 15px;
}

.acceptance-checks .table-scroll,
.acceptance-checks {
  min-width: 0;
}

/* 交付页验收表单独包裹滚动 */
.acceptance-checks {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.acceptance-checks > .section-title,
.acceptance-checks > .section-intro {
  position: relative;
}

/* 修改边界 */
.revision-boundary .boundary-list {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

/* 交付页相关入口 */
.delivery-main .related-paths {
  margin-bottom: 0;
}

.delivery-main .related-list {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

/* ===== 常见问题页 ===== */
.faq-intro {
  margin-bottom: 52px;
}

.faq-intro-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: 36px;
  align-items: center;
}

.faq-intro-figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--sand-soft);
}

.faq-intro-figure img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.faq-intro-figure figcaption {
  padding: 10px 14px;
  background-color: var(--paper-raised);
  border-top: 1px solid var(--line);
}

.faq-intro-text h2 {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 12px;
}

.faq-intro-text p {
  font-size: 16px;
  line-height: 1.85;
  margin-bottom: 14px;
}

.faq-intro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.faq-intro-links a {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  font-size: 14px;
  background-color: var(--paper-raised);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
}

.faq-intro-links a:hover {
  border-color: var(--brick);
  color: var(--brick);
}

/* 分组问答 */
.faq-group {
  padding: 40px 0;
  border-top: 1px solid var(--line);
}

.faq-group-alt {
  background-color: rgba(216, 198, 165, 0.22);
}

.faq-group-inner {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.faq-group-head {
  position: sticky;
  top: 96px;
}

.faq-group-label {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--brick);
  margin-bottom: 8px;
}

.faq-group-head h2 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--pine);
  margin-bottom: 10px;
}

.faq-group-head p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin-bottom: 12px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  font-size: 14px;
  border-bottom: 1px solid var(--line-strong);
}

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

.faq-group-list {
  min-width: 0;
  border-top: 1px solid var(--line-strong);
}

/* 相关路径（FAQ） */
.related-lead {
  max-width: 68ch;
  margin-top: 10px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.related-name {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  color: var(--pine);
}

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

/* ===== 合作说明页 ===== */
.fit-check {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 36px;
  align-items: start;
  margin-bottom: 52px;
}

.fit-check-intro h2 {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 14px;
}

.fit-check-intro p {
  font-size: 16px;
  line-height: 1.85;
  margin-bottom: 12px;
}

.fit-check-figure {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--sand-soft);
}

.fit-check-figure img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.fit-check-figure figcaption {
  padding: 10px 14px;
  background-color: var(--paper-raised);
  border-top: 1px solid var(--line);
}

/* 适用与不适用双栏 */
.fit-split {
  margin-bottom: 52px;
}

.fit-split h2,
.preflight-checklist h2,
.communication-boundary h2,
.next-paths h2 {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--pine);
}

.fit-split-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 22px;
}

.fit-column {
  padding: 24px 22px;
  background-color: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.fit-column-yes {
  border-top: 3px solid var(--pine);
}

.fit-column-no {
  border-top: 3px solid var(--line-strong);
  background-color: rgba(216, 198, 165, 0.24);
}

.fit-column h3 {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--pine);
  margin-bottom: 14px;
}

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

.fit-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.75;
}

.fit-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--sand);
}

.fit-column-yes .fit-list li::before {
  background-color: var(--pine);
}

.fit-note {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--line-strong);
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* 启动前自检表 */
.preflight-checklist {
  margin-bottom: 52px;
}

.checklist-table {
  width: 100%;
  min-width: 520px;
}

.checklist-note {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.checklist-note a {
  border-bottom: 1px solid var(--line-strong);
}

.checklist-note a:hover {
  border-bottom-color: var(--brick);
}

/* 沟通边界 */
.communication-boundary {
  margin-bottom: 52px;
}

.communication-boundary .boundary-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.communication-boundary .boundary-item h3 {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--pine);
  margin-bottom: 8px;
}

.communication-boundary .boundary-item p {
  font-size: 15px;
  line-height: 1.8;
}

/* 站内下一步 */
.next-paths {
  margin-bottom: 8px;
}

.next-paths h3 {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.45;
}

.next-paths h3 a {
  color: var(--pine);
}

.next-paths h3 a:hover {
  color: var(--brick);
}

/* ===== 404 ===== */
.error-main {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 72px var(--gutter) 80px;
}

.error-panel {
  max-width: 640px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.error-code {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--brick);
  margin-bottom: 12px;
}

.error-panel h1 {
  font-family: var(--font-serif);
  font-size: 38px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--pine);
  margin-bottom: 16px;
}

.error-text {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  margin-bottom: 24px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.error-paths {
  margin-top: 40px;
}

.error-paths h2 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--pine);
  margin-bottom: 16px;
}

.error-path-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.error-path-list a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 10px 16px;
  font-size: 15px;
  background-color: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.error-path-list a:hover {
  border-color: var(--brick);
  color: var(--brick);
}

/* --------------------------------------------------------------------------
   5. responsive —— 1080 / 768 / 480 断点
   -------------------------------------------------------------------------- */

@media (max-width: 1080px) {
  .header-inner {
    gap: 16px;
  }

  .nav-list a {
    padding: 0 8px;
    font-size: 14px;
  }

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

  .hero-title {
    font-size: 38px;
  }

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

  .service-row {
    grid-template-columns: 44px minmax(0, 1fr) minmax(0, 1.4fr) auto;
    gap: 14px;
  }

  .workbench-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  }

  .workbench-note {
    grid-column: 1 / -1;
  }

  .content-grid {
    grid-template-columns: minmax(0, 1fr) 290px;
    gap: 32px;
  }

  .sidebar-left {
    grid-template-columns: 230px minmax(0, 1fr);
    gap: 32px;
  }

  .faq-group-inner {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 32px;
  }

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

  .footer-about {
    grid-column: 1 / -1;
    padding-left: 0;
    padding-top: 24px;
    border-left: 0;
    border-top: 1px solid rgba(216, 198, 165, 0.2);
  }
}

@media (max-width: 768px) {
  body.site-body {
    font-size: 16px;
  }

  /* 移动导航 */
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    flex: 0 0 auto;
    justify-content: flex-start;
    background-color: var(--pine);
    border-top: 1px solid rgba(216, 198, 165, 0.22);
    padding: 8px var(--gutter) 16px;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    gap: 0;
  }

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

  .nav-list li {
    width: 100%;
    border-bottom: 1px solid rgba(216, 198, 165, 0.16);
  }

  .nav-list a {
    display: flex;
    width: 100%;
    min-height: 48px;
    padding: 0 4px;
    font-size: 16px;
    border-bottom: 2px solid transparent;
  }

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

  .header-inner {
    position: relative;
    min-height: 64px;
  }

  .brand {
    font-size: 18px;
  }

  /* 内页骨架 */
  .inner-main {
    padding: 0 18px 56px;
  }

  .breadcrumb {
    padding: 16px 0 4px;
  }

  .page-header {
    padding: 8px 0 20px;
    margin-bottom: 26px;
  }

  .page-title {
    font-size: 30px;
  }

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

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

  /* 首页 */
  .hero-workbench {
    padding: 28px 18px 0;
  }

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

  .hero-copy {
    padding-top: 0;
  }

  .hero-title {
    font-size: 34px;
  }

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

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

  .start-panels {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
    margin-top: 26px;
  }

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

  .service-index,
  .workflow-track,
  .material-split,
  .delivery-split,
  .faq-preview {
    padding: 44px 18px 0;
  }

  .service-row {
    grid-template-columns: 36px minmax(0, 1fr);
    grid-template-areas:
      "num name"
      "num scene"
      "link link";
    gap: 6px 12px;
    align-items: start;
  }

  .service-row .service-num {
    grid-area: num;
    padding-top: 4px;
  }

  .service-row .service-name {
    grid-area: name;
    font-size: 18px;
  }

  .service-row .service-scene {
    grid-area: scene;
  }

  .service-row .service-link {
    grid-area: link;
    justify-self: start;
    margin-top: 6px;
  }

  .track-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
  }

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

  .engagement-band {
    margin-top: 44px;
  }

  .engagement-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 36px 18px;
  }

  .engagement-action {
    padding-left: 0;
    padding-top: 20px;
    border-left: 0;
    border-top: 1px solid rgba(216, 198, 165, 0.28);
  }

  /* 用途图谱 */
  .use-summary-grid,
  .summary-grid,
  .fit-check,
  .faq-intro-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .use-index-row {
    grid-template-columns: 32px minmax(0, 1fr);
    grid-template-areas:
      "num name"
      "num question"
      "link link";
    gap: 4px 10px;
    align-items: start;
  }

  .use-index-row .use-index-num {
    grid-area: num;
    padding-top: 3px;
  }

  .use-index-row .use-index-name {
    grid-area: name;
  }

  .use-index-row .use-index-question {
    grid-area: question;
  }

  .use-index-row a {
    grid-area: link;
    justify-self: start;
    margin-top: 6px;
  }

  .use-detail-fields {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .use-detail-fields dt {
    margin-top: 8px;
  }

  .selection-grid,
  .related-list,
  .path-list,
  .boundary-list,
  .fit-split-grid,
  .communication-boundary .boundary-list,
  .revision-boundary .boundary-list,
  .delivery-main .related-list,
  .error-path-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  /* 服务范围 */
  .workbench-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

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

  /* 协作流程 */
  .node-bar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .node-item {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .node-item:nth-child(odd) {
    border-right: 1px solid var(--line);
  }

  .node-item:nth-last-child(-n + 2) {
    border-bottom: 0;
  }

  .stage-block {
    padding: 18px;
  }

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

  .stage-tag {
    margin-left: 0;
    width: 100%;
  }

  /* 素材与规范：侧栏下移 */
  .content-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .check-aside {
    position: static;
  }

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

  /* 交付与验收：索引在主内容之前，但保持单列 */
  .sidebar-left {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }

  .delivery-index {
    position: static;
  }

  .index-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .index-list li {
    border-bottom: 0;
  }

  .index-list a {
    min-height: 40px;
    padding: 0 12px;
    font-size: 14px;
    background-color: var(--sand-soft);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
  }

  /* 交付页表格：外层容器滚动，表格保持最小宽度 */
  .acceptance-checks {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .check-table {
    min-width: 520px;
  }

  /* 常见问题 */
  .faq-group {
    padding: 30px 0;
  }

  .faq-group-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

  .faq-group-head {
    position: static;
  }

  /* 页脚 */
  .site-footer {
    padding: 40px 0 32px;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
    padding: 0 18px;
  }

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

  /* 404 */
  .error-main {
    padding: 48px 18px 56px;
  }

  .error-panel h1 {
    font-size: 30px;
  }

  .related-links {
    margin-top: 32px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 30px;
  }

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

  .section-title {
    font-size: 22px;
  }

  .hero-actions .btn {
    width: 100%;
  }

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

  .node-item {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .node-item:nth-child(odd) {
    border-right: 0;
  }

  .node-item:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

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

  .index-list {
    flex-direction: column;
  }

  .index-list a {
    width: 100%;
  }

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

  .related-links {
    flex-direction: column;
    align-items: flex-start;
  }

  .related-links-item {
    width: 100%;
    justify-content: flex-start;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .start-panel:hover {
    transform: none;
  }
}

/* 程序验收反馈：移动端防溢出 */
@media (max-width: 768px) {
  .site-main,
  .site-main * {
    min-width: 0;
    max-width: 100%;
  }

  .site-main :is(h1, h2, h3, h4, p, a, span) {
    overflow-wrap: anywhere;
  }
}