/* ==========================================================================
   囧次元 fimlj.cn — 全站样式表
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* ==========================================================================
   base
   ========================================================================== */

:root {
  --color-primary: #1b3a63;
  --color-primary-soft: #2f6fb0;
  --color-primary-deep: #142c4c;
  --color-border: #d5dbe3;
  --color-surface: #f5f7fa;
  --color-paper: #ffffff;
  --color-text: #22272e;
  --color-text-soft: #55606d;
  --color-note: #eaf1f9;
  --color-row-alt: #fafbfd;
  --radius: 6px;
  --space: 4px;
  --container: 1120px;
  --header-height: 64px;
}

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

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

body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-text);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  font-variant-numeric: tabular-nums;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--color-primary);
  line-height: 1.4;
}

h1 {
  font-size: 30px;
  font-weight: 700;
}

h2 {
  font-size: 22px;
  font-weight: 600;
}

h3 {
  font-size: 18px;
  font-weight: 600;
}

p {
  margin: 0 0 12px;
}

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

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

dl,
dd,
dt,
figure,
figcaption {
  margin: 0;
}

a {
  color: var(--color-primary-soft);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  color: var(--color-primary);
  text-decoration: underline;
}

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

button {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--color-primary-soft);
  outline-offset: 2px;
}

[id] {
  scroll-margin-top: calc(var(--header-height) + 16px);
}

/* ==========================================================================
   layout
   ========================================================================== */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--color-paper);
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.home-main,
.inner-main,
.error-main {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

.inner-main,
.error-main {
  padding-bottom: 56px;
}

/* ---- 页头与主导航 ---- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--color-primary);
  border-bottom: 3px solid var(--color-primary-deep);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  color: #ffffff;
  font-size: 20px;
  font-weight: 700;
  min-height: 44px;
}

.brand:hover,
.brand:focus-visible {
  color: #ffffff;
  text-decoration: none;
  opacity: 0.88;
}

.site-nav {
  display: block;
}

.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 14px;
  color: #dce6f2;
  font-size: 15px;
  border-bottom: 3px solid transparent;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
  text-decoration: none;
}

.nav-list a.is-current {
  color: #ffffff;
  font-weight: 600;
  border-bottom-color: #7fb0e0;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius);
  cursor: pointer;
}

.nav-toggle::before {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  background: #ffffff;
  box-shadow: 0 -6px 0 #ffffff, 0 6px 0 #ffffff;
}

/* ---- 页脚 ---- */

.site-footer {
  flex: 0 0 auto;
  margin-top: 8px;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  color: var(--color-text);
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 36px 20px 20px;
  display: grid;
  grid-template-columns: minmax(240px, 1.6fr) repeat(3, minmax(150px, 1fr));
  gap: 24px 28px;
}

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

.footer-name {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
}

.footer-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-soft);
}

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

.footer-title {
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
}

.footer-group ul {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-group a {
  display: inline-block;
  padding: 4px 0;
  font-size: 14px;
  color: var(--color-text-soft);
  min-height: 28px;
}

.footer-group a:hover,
.footer-group a:focus-visible {
  color: var(--color-primary-soft);
}

.footer-copy {
  max-width: var(--container);
  margin: 0 auto;
  padding: 14px 20px 24px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-soft);
}

/* ==========================================================================
   components
   ========================================================================== */

/* ---- 按钮 ---- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--color-primary-deep);
  border-color: var(--color-primary-deep);
  color: #ffffff;
  text-decoration: none;
}

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

.btn-outline:hover,
.btn-outline:focus-visible {
  background: var(--color-note);
  border-color: var(--color-primary);
  color: var(--color-primary);
  text-decoration: none;
}

.btn-plain {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-primary);
}

.btn-plain:hover,
.btn-plain:focus-visible {
  background: var(--color-surface);
  border-color: var(--color-primary-soft);
  text-decoration: none;
}

/* ---- 区块通用 ---- */

.section {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}

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

.section-head h2 {
  margin-bottom: 8px;
}

.section-head p,
.section-desc,
.section-lead,
.section-note {
  font-size: 15px;
  color: var(--color-text-soft);
  max-width: 860px;
}

.section-more {
  margin-top: 18px;
  font-size: 15px;
}

.link-more {
  display: inline-block;
  padding: 4px 0;
  font-weight: 600;
}

.link-more::after {
  content: " →";
}

/* ---- 字段标签 ---- */

.field-label {
  display: inline-block;
  margin-right: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

/* ---- 面包屑 ---- */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding: 16px 0 0;
  font-size: 14px;
  color: var(--color-text-soft);
}

.breadcrumb-sep {
  color: #9aa5b1;
}

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

/* ---- 内页页面标题区 ---- */

.page-header {
  padding: 16px 0 24px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  margin-bottom: 10px;
}

.page-description {
  max-width: 860px;
  margin: 0;
  font-size: 15px;
  color: var(--color-text-soft);
}

/* ---- 通用列表 ---- */

.plain-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

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

.plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  background: var(--color-primary-soft);
  border-radius: 1px;
}

/* ---- 折叠问答 ---- */

.faq-list,
.faq-group {
  border-top: 1px solid var(--color-border);
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-paper);
}

.faq-item summary {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 14px 4px;
  min-height: 44px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
}

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

.faq-item summary::before {
  content: "＋";
  flex: 0 0 auto;
  width: 18px;
  font-weight: 400;
  color: var(--color-primary-soft);
}

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

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

.faq-item p {
  padding: 0 4px 16px 32px;
  font-size: 15px;
  color: var(--color-text-soft);
}

/* ---- 相关页面跳转 ---- */

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
}

.related-links li {
  display: block;
}

.related-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 15px;
  background: var(--color-paper);
}

.related-links a:hover,
.related-links a:focus-visible {
  border-color: var(--color-primary-soft);
  background: var(--color-note);
  text-decoration: none;
}

/* ---- 图片容器 ---- */

.hero-media,
.content-media,
.directory-media,
.matrix-figure,
.media-figure,
.faq-media {
  overflow: hidden;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}

.hero-media img,
.content-media img,
.directory-media img,
.matrix-figure img,
.media-figure img,
.faq-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-media figcaption,
.content-media figcaption,
.matrix-figure figcaption,
.media-caption,
.faq-media figcaption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text-soft);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

/* ==========================================================================
   pages — 首页
   ========================================================================== */

.fact-bar {
  background: var(--color-note);
  border-bottom: 1px solid var(--color-border);
}

.fact-bar p {
  max-width: var(--container);
  margin: 0 auto;
  padding: 10px 20px;
  font-size: 14px;
  color: var(--color-primary);
}

/* ---- 首屏 ---- */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 28px;
  padding: 36px 0 28px;
  border-bottom: 1px solid var(--color-border);
}

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

.hero-eyebrow {
  margin: 0 0 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-soft);
}

.hero-title {
  margin-bottom: 14px;
}

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

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.hero-media {
  position: relative;
  align-self: start;
  aspect-ratio: 16 / 10;
}

.hero-media figcaption {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.content-media {
  grid-column: 1 / -1;
  aspect-ratio: 21 / 9;
}

.content-media img {
  object-position: center 40%;
}

/* ---- 本页内容目录条 ---- */

.page-toc {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
}

.page-toc-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

.page-toc ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
}

.page-toc a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--color-text-soft);
  background: var(--color-paper);
}

.page-toc a:hover,
.page-toc a:focus-visible {
  border-color: var(--color-primary-soft);
  background: var(--color-note);
  color: var(--color-primary);
  text-decoration: none;
}

/* ---- 服务方向总目录 ---- */

.directory-list {
  border-top: 1px solid var(--color-border);
}

.directory-row {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 12px;
  border-bottom: 1px solid var(--color-border);
  transition: background-color 0.18s ease, border-color 0.18s ease;
}

.directory-row:hover {
  background: var(--color-surface);
  border-bottom-color: var(--color-primary-soft);
}

.dir-index {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary-soft);
}

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

.dir-name {
  margin-bottom: 8px;
  font-size: 17px;
}

.dir-name a:hover,
.dir-name a:focus-visible {
  text-decoration: underline;
}

.dir-field {
  margin: 0 0 6px;
  font-size: 15px;
  color: var(--color-text-soft);
}

.dir-field:last-child {
  margin-bottom: 0;
}

/* ---- 合作流程四步概览 ---- */

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

.step-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px;
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-primary);
  border-radius: var(--radius);
}

.step-no {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-soft);
}

.step-item .step-name {
  font-size: 17px;
}

.step-field {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-soft);
}

/* ---- 方向对比入口 ---- */

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

.compare-col {
  min-width: 0;
  padding: 20px;
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.compare-col h3 {
  margin-bottom: 10px;
}

.compare-col p {
  margin-bottom: 14px;
  font-size: 15px;
  color: var(--color-text-soft);
}

/* ---- 常见问题速览 ---- */

.faq-overview .faq-list {
  border-top: 1px solid var(--color-border);
}

/* ---- 站内栏目索引 ---- */

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

.index-cell {
  min-width: 0;
  padding: 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.index-cell h3 {
  margin-bottom: 8px;
  font-size: 16px;
}

.index-cell p {
  font-size: 14px;
  color: var(--color-text-soft);
}

/* ==========================================================================
   pages — 服务目录
   ========================================================================== */

.directory-section,
.field-note-section,
.jump-section {
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
}

.directory-section h2,
.field-note-section h2,
.jump-section h2 {
  margin-bottom: 8px;
}

.directory-section .section-lead,
.field-note-section .section-lead,
.jump-section .section-lead {
  margin-bottom: 20px;
}

.directory-item {
  display: grid;
  grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
  gap: 20px;
  padding: 20px 0;
  border-top: 1px solid var(--color-border);
}

.directory-item:last-child {
  border-bottom: 1px solid var(--color-border);
}

.directory-media {
  aspect-ratio: 4 / 3;
}

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

.directory-code {
  margin: 0 0 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-soft);
}

.directory-name {
  margin-bottom: 10px;
  font-size: 18px;
}

.directory-field {
  margin: 0 0 8px;
  font-size: 15px;
  color: var(--color-text-soft);
}

.directory-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 6px;
  font-weight: 600;
}

.directory-link::after {
  content: " →";
}

/* ---- 字段口径说明块 ---- */

.field-note {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 16px;
  padding: 20px;
  background: var(--color-note);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.field-note-col {
  min-width: 0;
}

.field-note-col h3 {
  margin-bottom: 10px;
  font-size: 16px;
}

.field-definition {
  display: grid;
  grid-template-columns: minmax(120px, 0.8fr) minmax(0, 1.2fr);
  gap: 8px 14px;
}

.field-definition dt {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

.field-definition dd {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-soft);
}

/* ---- 相关页面跳转 ---- */

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

.jump-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px;
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.18s ease;
}

.jump-card:hover {
  border-color: var(--color-primary-soft);
}

.jump-card h3 {
  font-size: 17px;
}

.jump-card p {
  margin: 0;
  font-size: 15px;
  color: var(--color-text-soft);
}

.jump-link {
  margin-top: auto;
  padding-top: 4px;
  font-weight: 600;
}

.jump-link::after {
  content: " →";
}

.jump-tail {
  margin-top: 16px;
  font-size: 15px;
}

/* ==========================================================================
   pages — 方向对比
   ========================================================================== */

.section-dimensions,
.section-matrix,
.section-conditions,
.section-related {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border);
}

.dimension-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 12px 20px;
}

.dimension-item {
  display: grid;
  grid-template-columns: minmax(120px, 0.7fr) minmax(0, 1.3fr);
  gap: 4px 14px;
  padding: 12px 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.dimension-item dt {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
}

.dimension-item dd {
  margin: 0;
  font-size: 15px;
  color: var(--color-text-soft);
}

.matrix-figure {
  max-width: 720px;
  margin-bottom: 20px;
  aspect-ratio: 16 / 9;
}

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

.compare-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  font-size: 15px;
}

.compare-table caption {
  padding: 12px 16px;
  text-align: left;
  font-size: 14px;
  color: var(--color-text-soft);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.compare-table th,
.compare-table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
}

.compare-table th:last-child,
.compare-table td:last-child {
  border-right: 0;
}

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

.compare-table thead th {
  background: var(--color-primary);
  color: #ffffff;
  font-weight: 600;
  white-space: nowrap;
}

.compare-table tbody th {
  background: var(--color-note);
  color: var(--color-primary);
  font-weight: 600;
  white-space: nowrap;
}

.compare-table tbody tr:nth-child(even) td {
  background: var(--color-row-alt);
}

.compare-cards {
  display: none;
}

.matrix-note {
  margin-top: 16px;
  font-size: 15px;
  color: var(--color-text-soft);
}

.matrix-note a {
  margin-right: 12px;
  font-weight: 600;
}

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

.conditions-col {
  min-width: 0;
  padding: 20px;
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.conditions-col h3 {
  margin-bottom: 12px;
}

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

.conditions-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--color-text-soft);
}

.conditions-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 8px;
  border: 2px solid var(--color-primary-soft);
  border-radius: 50%;
}

.conditions-note {
  margin-top: 16px;
  font-size: 15px;
}

/* ==========================================================================
   pages — 合作流程
   ========================================================================== */

.process-overview,
.process-stages,
.stage-deliverables,
.process-checklist,
.related-links {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border);
}

.section-title {
  margin-bottom: 8px;
}

.process-overview .section-desc,
.process-stages .section-desc,
.stage-deliverables .section-desc,
.process-checklist .section-desc,
.related-links .section-desc {
  margin-bottom: 20px;
}

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

.overview-step {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius);
}

.step-num {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-soft);
}

.overview-step .step-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
}

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

.stage-block {
  padding: 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-paper);
}

.stage-block + .stage-block {
  margin-top: 16px;
}

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

.stage-index {
  flex: 0 0 auto;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary-soft);
}

.stage-name {
  font-size: 18px;
}

.stage-fields {
  display: grid;
  grid-template-columns: minmax(140px, 0.5fr) minmax(0, 1.5fr);
  gap: 8px 16px;
}

.stage-fields .field-label {
  margin: 0;
  font-size: 14px;
  color: var(--color-primary);
}

.field-value {
  margin: 0;
  font-size: 15px;
  color: var(--color-text-soft);
}

.media-figure {
  max-width: 860px;
  margin-bottom: 20px;
  aspect-ratio: 16 / 9;
}

.deliverable-table {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

.deliverable-row {
  display: grid;
  grid-template-columns: minmax(90px, 0.7fr) minmax(0, 1.4fr) minmax(0, 1.4fr) minmax(0, 1.1fr);
  border-bottom: 1px solid var(--color-border);
}

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

.deliverable-head {
  background: var(--color-primary);
}

.deliverable-head .deliverable-cell {
  color: #ffffff;
  font-weight: 600;
}

.deliverable-cell {
  min-width: 0;
  padding: 12px 14px;
  font-size: 15px;
  color: var(--color-text-soft);
  border-right: 1px solid var(--color-border);
}

.deliverable-cell:last-child {
  border-right: 0;
}

.deliverable-row:nth-child(even):not(.deliverable-head) .deliverable-cell {
  background: var(--color-row-alt);
}

.checklist {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 10px 20px;
}

.checklist-item {
  position: relative;
  padding: 12px 16px 12px 40px;
  font-size: 15px;
  color: var(--color-text-soft);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.checklist-item::before {
  content: "✓";
  position: absolute;
  left: 14px;
  top: 12px;
  color: var(--color-primary-soft);
  font-weight: 700;
}

.related-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
}

.related-item a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 15px;
  background: var(--color-paper);
}

.related-item a:hover,
.related-item a:focus-visible {
  border-color: var(--color-primary-soft);
  background: var(--color-note);
  text-decoration: none;
}

/* ==========================================================================
   pages — 常见问题
   ========================================================================== */

.faq-block,
.feedback-block,
.related-block {
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
}

.faq-block h2,
.feedback-block h2,
.related-block h2 {
  margin-bottom: 8px;
}

.faq-block .section-note,
.feedback-block .section-note,
.related-block .section-note {
  margin-bottom: 20px;
}

.faq-group {
  margin-bottom: 20px;
  border-top: 0;
}

.faq-group-title {
  margin-bottom: 10px;
  padding: 8px 12px;
  font-size: 16px;
  background: var(--color-note);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.faq-group .faq-list {
  border-top: 1px solid var(--color-border);
}

.faq-question {
  font-size: 16px;
}

.faq-answer {
  padding: 0 4px 16px 32px;
}

.faq-answer p {
  margin: 0 0 8px;
  font-size: 15px;
  color: var(--color-text-soft);
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

.faq-media {
  max-width: 860px;
  margin: 0 auto 28px;
  aspect-ratio: 16 / 9;
}

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

.feedback-col {
  min-width: 0;
  padding: 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.feedback-col h3 {
  margin-bottom: 12px;
}

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

.feedback-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  color: var(--color-text-soft);
}

.feedback-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 8px;
  background: var(--color-primary-soft);
  border-radius: 1px;
}

.related-block .related-links {
  padding: 0;
  border-bottom: 0;
}

.related-block .related-links li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.related-block .related-links span {
  font-size: 14px;
  color: var(--color-text-soft);
}

/* ==========================================================================
   pages — 404
   ========================================================================== */

.error-main {
  display: block;
}

.error-block {
  padding: 56px 0 32px;
  border-bottom: 1px solid var(--color-border);
}

.error-code {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary-soft);
}

.error-block h1 {
  margin-bottom: 12px;
}

.error-text {
  max-width: 720px;
  font-size: 16px;
  color: var(--color-text-soft);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.error-links {
  padding: 28px 0 0;
}

.error-links h2 {
  margin-bottom: 14px;
}

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

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

.error-link-list a:hover,
.error-link-list a:focus-visible {
  border-color: var(--color-primary-soft);
  background: var(--color-note);
  text-decoration: none;
}

/* ==========================================================================
   responsive
   ========================================================================== */

@media (max-width: 1024px) {
  .step-list,
  .overview-steps,
  .index-grid,
  .error-link-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

@media (max-width: 768px) {
  :root {
    --header-height: 58px;
  }

  h1 {
    font-size: 24px;
  }

  h2 {
    font-size: 20px;
  }

  h3 {
    font-size: 17px;
  }

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

  .header-inner {
    padding: 0 16px;
    flex-wrap: wrap;
    gap: 8px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    flex: 1 0 100%;
    order: 3;
  }

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

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

  .nav-list a {
    display: flex;
    width: 100%;
    min-height: 48px;
    padding: 0 4px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  }

  .nav-list a.is-current {
    border-bottom-color: rgba(255, 255, 255, 0.14);
    background: rgba(255, 255, 255, 0.1);
  }

  .fact-bar p {
    padding: 10px 16px;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
    padding: 24px 0 20px;
  }

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

  .content-media {
    aspect-ratio: 4 / 3;
  }

  .page-toc {
    gap: 8px 12px;
  }

  .directory-row {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
    padding: 16px 4px;
  }

  .step-list,
  .overview-steps,
  .index-grid,
  .error-link-list,
  .jump-flow,
  .dimension-list,
  .conditions-grid,
  .feedback-columns,
  .checklist,
  .field-note,
  .compare-entry-grid {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

  .field-definition {
    grid-template-columns: minmax(0, 1fr);
    gap: 2px 0;
  }

  .field-definition dd {
    margin-bottom: 10px;
  }

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

  .stage-fields .field-label {
    margin-top: 8px;
  }

  .stage-fields .field-label:first-child {
    margin-top: 0;
  }

  .table-wrap {
    display: none;
  }

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

  .compare-card {
    padding: 18px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-paper);
  }

  .compare-card h3 {
    margin-bottom: 12px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-border);
  }

  .compare-card dl {
    display: grid;
    grid-template-columns: minmax(96px, 0.6fr) minmax(0, 1.4fr);
    gap: 6px 12px;
  }

  .compare-card dt {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
  }

  .compare-card dd {
    margin: 0;
    font-size: 14px;
    color: var(--color-text-soft);
  }

  .deliverable-table {
    border: 0;
    border-radius: 0;
  }

  .deliverable-head {
    display: none;
  }

  .deliverable-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    margin-bottom: 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
  }

  .deliverable-row:last-child {
    margin-bottom: 0;
  }

  .deliverable-cell {
    border-right: 0;
    border-bottom: 1px solid var(--color-border);
  }

  .deliverable-cell:last-child {
    border-bottom: 0;
  }

  .deliverable-cell:first-child {
    background: var(--color-note);
    font-weight: 600;
    color: var(--color-primary);
  }

  .deliverable-row:nth-child(even):not(.deliverable-head) .deliverable-cell {
    background: transparent;
  }

  .deliverable-row:nth-child(even):not(.deliverable-head) .deliverable-cell:first-child {
    background: var(--color-note);
  }

  .matrix-figure,
  .media-figure,
  .faq-media {
    aspect-ratio: 4 / 3;
  }

  .faq-item p,
  .faq-answer {
    padding-left: 4px;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
    padding: 28px 16px 16px;
  }

  .footer-copy {
    padding: 12px 16px 20px;
  }
}

@media (max-width: 480px) {
  .hero-actions .btn,
  .error-actions .btn {
    flex: 1 1 100%;
  }

  .related-links a,
  .related-item a {
    width: 100%;
  }

  .related-block .related-links li {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
}

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

  .btn,
  .directory-row,
  .jump-card {
    transition: none;
  }
}