/* ==========================================================================
   囧次元 · 通用型内容服务官网
   全站样式表
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* ==========================================================================
   base · 变量与基础排版
   ========================================================================== */

:root {
  --paper: #FBF9F4;
  --ink: #1F1D1A;
  --ink-soft: #55504A;
  --ink-mute: #7A736A;
  --indigo: #2F4B8F;
  --indigo-deep: #233A72;
  --brick: #B5442E;
  --grass: #3F7A55;
  --line: #E4DFD4;
  --line-strong: #CFC7B7;
  --card: #FFFFFF;
  --card-tint: #F4F1E9;
  --container: 1120px;
  --reading: 720px;
  --radius: 6px;
  --radius-sm: 4px;
  --shadow-soft: 0 1px 2px rgba(31, 29, 26, 0.05);
  --shadow-lift: 0 4px 14px rgba(31, 29, 26, 0.08);
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-head: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, sans-serif;
  --font-mono: "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%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: var(--font-head);
  color: var(--ink);
  font-weight: 700;
  line-height: 1.35;
}

h1 {
  font-size: 34px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

h4 {
  font-size: 16px;
}

p {
  margin: 0 0 14px;
}

p:last-child {
  margin-bottom: 0;
}

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

dl,
dd {
  margin: 0;
}

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

a:hover,
a:focus-visible {
  color: var(--indigo-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

figure {
  margin: 0;
}

button {
  font: inherit;
  color: inherit;
}

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

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

/* ==========================================================================
   layout · 全站骨架：容器、页头、导航、主区、面包屑、页脚
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background-color: var(--paper);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 68px;
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  flex: 0 0 auto;
  font-family: var(--font-head);
  font-size: 21px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0;
  padding: 6px 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.brand::before {
  content: "";
  width: 10px;
  height: 20px;
  background-color: var(--brick);
  border-radius: 2px;
}

.brand:hover,
.brand:focus-visible {
  color: var(--indigo);
  text-decoration: none;
}

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

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

.nav-list li {
  display: block;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  color: var(--ink-soft);
  font-size: 15px;
  border-bottom: 2px solid transparent;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--indigo);
  text-decoration: none;
  border-bottom-color: var(--line-strong);
}

.nav-list a.is-current {
  color: var(--indigo);
  font-weight: 600;
  border-bottom-color: var(--indigo);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  margin-left: auto;
  background: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--ink);
  border-radius: 1px;
}

.nav-toggle:hover {
  border-color: var(--indigo);
}

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

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

.inner-main {
  padding-top: 24px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 8px 0 4px;
  font-size: 14px;
  color: var(--ink-mute);
}

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

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

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

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

.page-header {
  padding: 20px 0 28px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}

.page-title {
  font-size: 34px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
}

.page-description {
  max-width: var(--reading);
  color: var(--ink-soft);
  font-size: 16px;
  margin: 0;
}

.site-footer {
  background-color: var(--card-tint);
  border-top: 1px solid var(--line);
  margin-top: 24px;
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.6fr repeat(4, 1fr);
  gap: 32px 28px;
}

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

.footer-brand {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 10px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 320px;
  margin: 0;
}

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

.footer-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-strong);
}

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

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

.footer-list a:hover,
.footer-list a:focus-visible {
  color: var(--indigo);
}

.footer-note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mute);
}

.footer-bottom {
  border-top: 1px solid var(--line);
}

.footer-copy {
  max-width: var(--container);
  margin: 0 auto;
  padding: 18px 24px 24px;
  font-size: 13px;
  color: var(--ink-mute);
}

/* ==========================================================================
   components · 通用组件
   ========================================================================== */

.section {
  padding: 48px 0;
  border-bottom: 1px solid var(--line);
}

.section:last-of-type {
  border-bottom: 0;
}

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

.section-title {
  font-size: 24px;
  color: var(--ink);
  margin-bottom: 10px;
}

.section-desc,
.section-intro {
  max-width: var(--reading);
  color: var(--ink-soft);
  font-size: 16px;
  margin: 0;
}

.section-intro a,
.section-desc a {
  color: var(--indigo);
  border-bottom: 1px solid var(--line-strong);
}

.section-intro a:hover,
.section-desc a:hover {
  text-decoration: none;
  border-bottom-color: var(--indigo);
}

.field-label {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 8px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--brick);
  background-color: rgba(181, 68, 46, 0.08);
  border: 1px solid rgba(181, 68, 46, 0.22);
  border-radius: 3px;
  white-space: nowrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
}

.btn:hover,
.btn:focus-visible {
  text-decoration: none;
}

.btn-primary {
  background-color: var(--indigo);
  color: #FFFFFF;
  border-color: var(--indigo);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background-color: var(--indigo-deep);
  border-color: var(--indigo-deep);
  color: #FFFFFF;
}

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: var(--indigo);
  background-color: rgba(47, 75, 143, 0.06);
  color: var(--indigo-deep);
}

.text-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  color: var(--indigo);
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
}

.text-link:hover,
.text-link:focus-visible {
  text-decoration: none;
  border-bottom-color: var(--indigo);
}

/* 站内栏目索引：五列入口网格 */
.index-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.index-cell {
  min-width: 0;
}

.index-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  height: 100%;
  padding: 16px 14px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
}

.index-link:hover,
.index-link:focus-visible {
  text-decoration: none;
  border-color: var(--indigo);
  box-shadow: var(--shadow-lift);
}

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

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

.index-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mute);
}

/* 折叠式问答 */
.faq-list,
.faq-fold-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 900px;
}

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

.faq-question,
.faq-fold-question {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  min-height: 48px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::before,
.faq-fold-question::before {
  content: "";
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--indigo);
  border-bottom: 2px solid var(--indigo);
  transform: rotate(-45deg);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-question::before,
.faq-fold-item[open] .faq-fold-question::before {
  transform: rotate(45deg);
}

.faq-question:hover,
.faq-fold-question:hover {
  color: var(--indigo);
}

.faq-answer,
.faq-fold-answer {
  padding: 14px 18px 16px 37px;
  font-size: 15px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
}

.faq-more {
  margin-top: 18px;
}

/* 准备材料 / 信息清单：复选框式条目 */
.checklist {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 20px;
  max-width: 900px;
}

.checklist-item {
  min-width: 0;
}

.checklist-label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  min-height: 44px;
  padding: 10px 14px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.checklist-label:hover {
  border-color: var(--line-strong);
}

.checklist-input {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin: 5px 0 0;
  accent-color: var(--grass);
}

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

.checklist-input:checked + .checklist-text {
  color: var(--grass);
}

/* 图片容器与说明 */
.direction-figure,
.faq-figure,
.section-figure,
.section-media,
.hero-figure,
.content-media {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--card);
  overflow: hidden;
}

.direction-figure img,
.faq-figure img,
.section-figure img,
.section-media img,
.hero-figure img,
.content-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.direction-figure figcaption,
.faq-figure figcaption,
.section-figure figcaption,
.section-media figcaption,
.hero-figure figcaption,
.content-media figcaption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mute);
  border-top: 1px solid var(--line);
  background-color: var(--card);
}

/* ==========================================================================
   pages · 首页
   ========================================================================== */

.top-fact {
  margin: 0;
  padding: 9px 24px;
  background-color: var(--ink);
  color: #EDE9E0;
  font-size: 13px;
  line-height: 1.7;
  text-align: center;
}

/* 首屏判断区 */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 40px;
  align-items: start;
  padding: 52px 0 48px;
  border-bottom: 1px solid var(--line);
}

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

.hero-kicker {
  display: inline-block;
  margin: 0 0 16px;
  padding: 3px 10px;
  font-size: 13px;
  color: var(--indigo);
  background-color: rgba(47, 75, 143, 0.08);
  border: 1px solid rgba(47, 75, 143, 0.2);
  border-radius: 3px;
}

.hero-title {
  font-size: 34px;
  line-height: 1.3;
  color: var(--ink);
  margin-bottom: 18px;
}

.hero-lead {
  max-width: 560px;
  font-size: 16px;
  color: var(--ink-soft);
  margin-bottom: 12px;
}

.hero-note {
  max-width: 560px;
  font-size: 14px;
  color: var(--ink-mute);
  padding-left: 14px;
  border-left: 3px solid var(--line-strong);
  margin-bottom: 24px;
}

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

.hero-media {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

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

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.fact-item {
  min-width: 0;
  padding: 14px 12px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-top: 3px solid var(--indigo);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

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

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

.content-media-primary {
  margin-top: 32px;
}

.content-media-primary img {
  aspect-ratio: 21 / 9;
}

/* 服务方向索引表 */
.direction-list {
  border-top: 2px solid var(--ink);
}

.direction-row {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr) 140px;
  gap: 20px;
  align-items: start;
  padding: 20px 4px;
  border-bottom: 1px solid var(--line);
}

.direction-row:hover {
  background-color: rgba(47, 75, 143, 0.04);
}

.direction-code {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--brick);
  padding-top: 2px;
}

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

.direction-name {
  font-size: 18px;
  color: var(--ink);
  margin-bottom: 8px;
}

.direction-audience,
.direction-delivery {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin-bottom: 6px;
}

.direction-delivery {
  margin-bottom: 0;
}

.direction-link {
  align-self: center;
  justify-self: end;
  font-size: 14px;
  font-weight: 600;
  color: var(--indigo);
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
}

.direction-link:hover,
.direction-link:focus-visible {
  text-decoration: none;
  border-bottom-color: var(--indigo);
}

/* 合作流程阶段时间轴 */
.timeline {
  position: relative;
  padding-left: 30px;
  border-left: 2px solid var(--line-strong);
}

.timeline-node {
  position: relative;
  padding: 0 0 28px 20px;
}

.timeline-node:last-child {
  padding-bottom: 0;
}

.timeline-node::before {
  content: "";
  position: absolute;
  left: -39px;
  top: 8px;
  width: 12px;
  height: 12px;
  background-color: var(--paper);
  border: 2px solid var(--indigo);
  border-radius: 50%;
}

.timeline-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--brick);
  margin-bottom: 4px;
}

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

.timeline-name {
  font-size: 18px;
  color: var(--ink);
  margin-bottom: 8px;
}

.timeline-prep,
.timeline-out {
  max-width: var(--reading);
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin-bottom: 6px;
}

.timeline-out {
  margin-bottom: 0;
}

.flow-more {
  margin-top: 22px;
}

/* 交付范围与验收标准摘要 */
.scope-columns {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 28px;
}

.scope-col {
  min-width: 0;
  padding: 20px 22px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.scope-col:first-child {
  border-top: 3px solid var(--indigo);
}

.scope-col:last-child {
  border-top: 3px solid var(--grass);
}

.scope-subtitle {
  font-size: 17px;
  color: var(--ink);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

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

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

.scope-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  background-color: var(--line-strong);
  border-radius: 50%;
}

.scope-col:first-child .scope-list li::before {
  background-color: var(--indigo);
}

.scope-col:last-child .scope-list li::before {
  background-color: var(--grass);
}

.scope-more {
  margin-top: 20px;
}

/* ==========================================================================
   pages · 服务方向
   ========================================================================== */

.section-overview .section-intro {
  margin-bottom: 22px;
}

.numbering-rule {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 0;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.rule-term {
  padding: 14px 16px 14px 0;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--brick);
  border-bottom: 1px solid var(--line);
}

.rule-desc {
  padding: 14px 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line);
}

.rule-term:last-of-type,
.rule-desc:last-of-type {
  border-bottom: 0;
}

.section-scenes .section-intro {
  margin-bottom: 26px;
}

.direction-block {
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.direction-block:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.direction-block .direction-name {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 20px;
  margin-bottom: 16px;
}

.direction-no {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--brick);
}

.direction-block .direction-figure {
  margin-bottom: 18px;
}

.direction-block .direction-figure img {
  aspect-ratio: 16 / 7;
}

.direction-block .direction-audience,
.direction-block .direction-scene {
  max-width: var(--reading);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.direction-block .direction-scene {
  margin-bottom: 0;
}

.section-scope .section-intro {
  margin-bottom: 26px;
}

.scope-row {
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

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

.scope-name {
  font-size: 18px;
  color: var(--ink);
  margin-bottom: 16px;
}

.scope-row .scope-columns {
  gap: 24px;
}

.scope-col-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
}

.scope-include {
  border-top: 3px solid var(--indigo);
}

.scope-exclude {
  border-top: 3px solid var(--brick);
}

.scope-exclude .scope-list li::before {
  background-color: var(--brick);
}

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

.choosing-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.choosing-item {
  min-width: 0;
  padding: 20px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.choosing-q {
  font-size: 16px;
  color: var(--indigo);
  margin-bottom: 10px;
}

.choosing-a {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.section-next {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 26px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.section-next a {
  font-size: 15px;
  font-weight: 600;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
}

.section-next a:hover,
.section-next a:focus-visible {
  text-decoration: none;
  border-bottom-color: var(--indigo);
}

/* 服务方向页 · 站内栏目索引卡片 */
.section-index .index-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.index-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
  height: 100%;
  padding: 16px 14px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
}

.index-card:hover,
.index-card:focus-visible {
  text-decoration: none;
  border-color: var(--indigo);
  box-shadow: var(--shadow-lift);
}

/* ==========================================================================
   pages · 合作流程
   ========================================================================== */

.flow-overview,
.flow-stages,
.flow-outputs,
.flow-blockers,
.site-index {
  padding: 44px 0;
  border-bottom: 1px solid var(--line);
}

.site-index {
  border-bottom: 0;
}

.flow-overview .section-title,
.flow-stages .section-title,
.flow-outputs .section-title,
.flow-blockers .section-title,
.site-index .section-title {
  margin-bottom: 10px;
}

.flow-overview .section-intro,
.flow-stages .section-intro,
.flow-outputs .section-intro,
.flow-blockers .section-intro,
.site-index .section-intro {
  margin-bottom: 24px;
}

.step-nav-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.step-nav-item {
  min-width: 0;
}

.step-nav-item a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 44px;
  padding: 14px 16px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--indigo);
  border-radius: var(--radius-sm);
  color: var(--ink);
}

.step-nav-item a:hover,
.step-nav-item a:focus-visible {
  text-decoration: none;
  border-color: var(--indigo);
}

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

.step-name {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.stage-block {
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.stage-block:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.stage-head {
  margin-bottom: 18px;
}

.stage-head .stage-index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--brick);
  margin-bottom: 6px;
}

.stage-title {
  font-size: 20px;
  color: var(--ink);
  margin-bottom: 8px;
}

.stage-summary {
  max-width: var(--reading);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

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

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

.stage-col-materials {
  border-top: 3px solid var(--indigo);
}

.stage-col-actions {
  border-top: 3px solid var(--grass);
}

.col-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.material-list,
.action-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

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

.material-list li::before,
.action-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--indigo);
}

.action-list li::before {
  background-color: var(--grass);
}

.flow-outputs .section-figure {
  margin-bottom: 22px;
}

.flow-outputs .section-figure img {
  aspect-ratio: 21 / 9;
}

.output-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--card);
}

.output-table {
  min-width: 640px;
  font-size: 15px;
}

.output-table caption {
  padding: 12px 16px;
  text-align: left;
  font-size: 14px;
  color: var(--ink-mute);
  border-bottom: 1px solid var(--line);
}

.output-table th,
.output-table td {
  padding: 13px 16px;
  text-align: left;
  vertical-align: top;
  line-height: 1.7;
  border-bottom: 1px solid var(--line);
}

.output-table thead th {
  background-color: var(--card-tint);
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
}

.output-table tbody th {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 400;
  color: var(--brick);
  white-space: nowrap;
}

.output-table tbody td {
  color: var(--ink-soft);
}

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

.blocker-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.blocker-item {
  min-width: 0;
  padding: 20px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-top: 3px solid var(--brick);
  border-radius: var(--radius);
}

.blocker-title {
  font-size: 16px;
  color: var(--ink);
  margin-bottom: 10px;
}

.blocker-desc {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.site-index .index-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

/* ==========================================================================
   pages · 交付范围
   ========================================================================== */

.content-section {
  padding: 44px 0;
  border-bottom: 1px solid var(--line);
}

.content-section:last-of-type {
  border-bottom: 0;
}

.content-section .section-head {
  margin-bottom: 24px;
}

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

.section-media img {
  aspect-ratio: 21 / 9;
}

.deliverable-list {
  border-top: 2px solid var(--ink);
}

.deliverable-item {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 6px 20px;
  padding: 18px 4px;
  border-bottom: 1px solid var(--line);
}

.deliverable-item:hover {
  background-color: rgba(47, 75, 143, 0.04);
}

.deliverable-no {
  grid-row: span 2;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--brick);
  padding-top: 3px;
}

.deliverable-name {
  font-size: 17px;
  color: var(--ink);
}

.deliverable-text {
  max-width: var(--reading);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 0;
}

.section-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.section-foot a {
  font-size: 15px;
  font-weight: 600;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
}

.section-foot a:hover,
.section-foot a:focus-visible {
  text-decoration: none;
  border-bottom-color: var(--indigo);
}

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

.acceptance-col {
  min-width: 0;
  padding: 20px 22px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.acceptance-col-item {
  border-top: 3px solid var(--indigo);
}

.acceptance-col-rule {
  border-top: 3px solid var(--grass);
}

.acceptance-heading {
  font-size: 17px;
  color: var(--ink);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

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

.acceptance-row {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 8px;
  align-items: start;
}

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

.acceptance-label,
.acceptance-rule {
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.acceptance-col-rule .acceptance-no {
  color: var(--grass);
}

.revision-block {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.revision-item {
  min-width: 0;
  padding: 20px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.revision-included {
  border-top: 3px solid var(--indigo);
}

.revision-excluded {
  border-top: 3px solid var(--brick);
}

.revision-heading {
  font-size: 16px;
  color: var(--ink);
  margin-bottom: 10px;
}

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

.handover-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.handover-item {
  min-width: 0;
  padding: 20px;
  background-color: var(--card-tint);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.handover-heading {
  font-size: 16px;
  color: var(--ink);
  margin-bottom: 10px;
}

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

.section-site-index .index-grid {
  display: block;
}

.section-site-index .index-list {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.index-item {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 14px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.index-item:hover {
  border-color: var(--indigo);
  box-shadow: var(--shadow-lift);
}

.index-item a {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.index-item a:hover,
.index-item a:focus-visible {
  text-decoration: none;
  color: var(--indigo);
}

.index-note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mute);
}

/* ==========================================================================
   pages · 问题解答
   ========================================================================== */

.faq-nav-section,
.faq-type-section,
.faq-step-section,
.faq-fold-section,
.faq-info-section,
.site-index-section {
  padding: 44px 0;
  border-bottom: 1px solid var(--line);
}

.site-index-section {
  border-bottom: 0;
}

.faq-nav-section .section-title,
.faq-type-section .section-title,
.faq-step-section .section-title,
.faq-fold-section .section-title,
.faq-info-section .section-title,
.site-index-section .section-title {
  margin-bottom: 10px;
}

.faq-nav-section .section-intro,
.faq-type-section .section-intro,
.faq-step-section .section-intro,
.faq-fold-section .section-intro,
.faq-info-section .section-intro,
.site-index-section .section-intro {
  margin-bottom: 24px;
}

.faq-nav-list {
  border-top: 2px solid var(--ink);
}

.faq-nav-item {
  display: grid;
  grid-template-columns: 64px 180px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 15px 4px;
  border-bottom: 1px solid var(--line);
}

.faq-nav-item:hover {
  background-color: rgba(47, 75, 143, 0.04);
}

.faq-nav-code {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--brick);
}

.faq-nav-link {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 600;
  color: var(--indigo);
}

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

.faq-type-section .faq-figure {
  margin-bottom: 24px;
}

.faq-type-section .faq-figure img {
  aspect-ratio: 21 / 9;
}

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

.faq-group:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.faq-group-title {
  font-size: 19px;
  color: var(--ink);
  margin-bottom: 14px;
  padding-left: 12px;
  border-left: 4px solid var(--indigo);
}

.faq-phenomenon,
.faq-cause {
  max-width: var(--reading);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.faq-cause {
  margin-bottom: 0;
}

.faq-step-group {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 8px 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.faq-step-group:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.faq-step-title {
  grid-row: span 2;
  font-size: 17px;
  color: var(--ink);
  align-self: start;
  padding-top: 4px;
}

.step-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  counter-reset: faq-step;
}

.step-item {
  position: relative;
  padding-left: 30px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  counter-increment: faq-step;
}

.step-item::before {
  content: counter(faq-step);
  position: absolute;
  left: 0;
  top: 4px;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  color: #FFFFFF;
  background-color: var(--indigo);
  border-radius: 50%;
}

.faq-escalation {
  grid-column: 2;
  max-width: var(--reading);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  margin: 4px 0 0;
  padding: 12px 16px;
  background-color: rgba(63, 122, 85, 0.07);
  border-left: 3px solid var(--grass);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.faq-info-note {
  max-width: var(--reading);
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-mute);
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.site-index-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.site-index-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  height: 100%;
  padding: 16px 14px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
}

.site-index-item:hover,
.site-index-item:focus-visible {
  text-decoration: none;
  border-color: var(--indigo);
  box-shadow: var(--shadow-lift);
}

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

.site-index-desc {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-mute);
}

/* ==========================================================================
   pages · 404
   ========================================================================== */

.error-main {
  padding-top: 40px;
}

.error-hero {
  max-width: 680px;
  padding: 40px 0 48px;
  border-bottom: 1px solid var(--line);
}

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

.error-hero h1 {
  font-size: 34px;
  color: var(--ink);
  margin-bottom: 14px;
}

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

.error-action {
  margin: 0;
}

.error-nav-section {
  padding: 44px 0 0;
}

.error-nav-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.error-nav-list a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 14px 16px;
  background-color: var(--card);
  border: 1px solid var(--line);
  border-left: 3px solid var(--indigo);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.error-nav-list a:hover,
.error-nav-list a:focus-visible {
  text-decoration: none;
  border-color: var(--indigo);
  color: var(--indigo);
}

/* ==========================================================================
   responsive · 900px 断点
   ========================================================================== */

@media (max-width: 900px) {

  .header-inner {
    padding: 0 18px;
    gap: 12px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    background-color: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-lift);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 18px 16px;
  }

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

  .nav-list a {
    display: flex;
    min-height: 48px;
    padding: 0 4px;
    border-bottom: 1px solid var(--line);
    border-left: 3px solid transparent;
  }

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

  .nav-list a:hover,
  .nav-list a:focus-visible,
  .nav-list a.is-current {
    border-bottom-color: var(--line);
    border-left-color: var(--indigo);
    padding-left: 10px;
  }

  .site-main {
    padding: 0 18px 48px;
  }

  .top-fact {
    padding: 8px 18px;
    text-align: left;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
    padding: 36px 0 36px;
  }

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

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

  .page-header {
    padding: 16px 0 22px;
    margin-bottom: 30px;
  }

  .section,
  .content-section,
  .flow-overview,
  .flow-stages,
  .flow-outputs,
  .flow-blockers,
  .site-index,
  .faq-nav-section,
  .faq-type-section,
  .faq-step-section,
  .faq-fold-section,
  .faq-info-section,
  .site-index-section {
    padding: 34px 0;
  }

  .direction-row {
    grid-template-columns: 60px minmax(0, 1fr);
    gap: 12px;
  }

  .direction-link {
    grid-column: 2;
    justify-self: start;
  }

  .scope-columns,
  .stage-body,
  .acceptance-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .numbering-rule {
    grid-template-columns: 140px minmax(0, 1fr);
  }

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

  .step-nav-list,
  .blocker-list,
  .revision-block,
  .handover-list,
  .error-nav-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .index-grid,
  .section-index .index-grid,
  .site-index .index-grid,
  .section-site-index .index-list,
  .site-index-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .faq-nav-item {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 6px 14px;
  }

  .faq-nav-desc {
    grid-column: 2;
  }

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

  .faq-step-title {
    grid-row: auto;
    padding-top: 0;
  }

  .faq-escalation {
    grid-column: 1;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px 24px;
    padding: 36px 18px 26px;
  }

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

  .footer-desc {
    max-width: 520px;
  }

  .footer-copy {
    padding: 16px 18px 22px;
  }
}

/* ==========================================================================
   responsive · 640px 断点
   ========================================================================== */

@media (max-width: 640px) {

  body {
    font-size: 15px;
  }

  h1 {
    font-size: 26px;
  }

  h2 {
    font-size: 21px;
  }

  h3 {
    font-size: 17px;
  }

  .header-inner {
    min-height: 60px;
    padding: 0 14px;
  }

  .brand {
    font-size: 19px;
  }

  .site-main {
    padding: 0 14px 40px;
  }

  .top-fact {
    padding: 8px 14px;
    font-size: 12px;
  }

  .hero {
    padding: 28px 0 30px;
  }

  .hero-title,
  .page-title,
  .error-hero h1 {
    font-size: 24px;
  }

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

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

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

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

  .direction-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .direction-code {
    padding-top: 0;
  }

  .direction-link {
    grid-column: 1;
  }

  .timeline {
    padding-left: 22px;
  }

  .timeline-node {
    padding-left: 14px;
  }

  .timeline-node::before {
    left: -31px;
  }

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

  .rule-term {
    padding: 12px 0 2px;
    border-bottom: 0;
  }

  .rule-desc {
    padding: 2px 0 12px;
    border-bottom: 1px solid var(--line);
  }

  .scope-col,
  .stage-col,
  .acceptance-col,
  .choosing-item,
  .blocker-item,
  .revision-item,
  .handover-item {
    padding: 16px 16px;
  }

  .step-nav-list,
  .blocker-list,
  .revision-block,
  .handover-list,
  .error-nav-list,
  .index-grid,
  .section-index .index-grid,
  .site-index .index-grid,
  .section-site-index .index-list,
  .site-index-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .deliverable-no {
    grid-row: auto;
    padding-top: 0;
  }

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

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

  .faq-nav-desc {
    grid-column: 1;
  }

  .faq-question,
  .faq-fold-question {
    padding: 13px 14px;
    font-size: 15px;
  }

  .faq-answer,
  .faq-fold-answer {
    padding: 12px 14px 14px 33px;
    font-size: 14px;
  }

  .checklist-label {
    padding: 10px 12px;
  }

  .section-next,
  .section-foot {
    flex-direction: column;
    gap: 12px;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 28px 14px 22px;
  }

  .footer-copy {
    padding: 14px 14px 20px;
  }

  .output-table {
    min-width: 560px;
  }

  .output-table th,
  .output-table td {
    padding: 11px 12px;
  }
}