/* ==========================================================================
   91看片 · 全站样式表
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   base · 变量与基础元素
   -------------------------------------------------------------------------- */

:root {
  --c-bg: #f6f8fa;
  --c-panel: #ffffff;
  --c-text: #0f1720;
  --c-primary: #1f6feb;
  --c-primary-dark: #1a5ed1;
  --c-green: #12b886;
  --c-muted: #8b949e;
  --c-line: #d8dee6;
  --c-note-bg: #fff4e5;
  --c-note-text: #8a5a12;

  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Hiragino Sans GB", "Source Han Sans SC", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Consolas, "JetBrains Mono", "Liberation Mono", Menlo, monospace;

  --w-shell: 1180px;
  --w-body: 760px;
  --radius: 6px;
  --radius-sm: 4px;
}

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

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

body {
  margin: 0;
  background-color: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
  line-height: 1.4;
  color: var(--c-text);
}

p {
  margin: 0;
}

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

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

a:hover {
  color: var(--c-primary-dark);
}

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

figure {
  margin: 0;
}

figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: var(--c-muted);
  line-height: 1.6;
}

strong {
  font-weight: 600;
}

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

/* --------------------------------------------------------------------------
   layout · 全站骨架
   -------------------------------------------------------------------------- */

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background-color: var(--c-panel);
  border-bottom: 1px solid var(--c-line);
}

.header-inner {
  max-width: var(--w-shell);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  font-size: 19px;
  font-weight: 600;
  color: var(--c-text);
  letter-spacing: 0.4px;
  white-space: nowrap;
}

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

.site-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 15px;
  color: var(--c-text);
  border-bottom: 2px solid transparent;
  padding: 0 2px;
}

.nav-link:hover {
  color: var(--c-primary);
}

.nav-link.is-current {
  color: var(--c-primary);
  border-bottom-color: var(--c-primary);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-sm);
  background-color: var(--c-panel);
  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(--c-text);
}

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

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

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

.site-footer {
  flex: 0 0 auto;
  background-color: var(--c-panel);
  border-top: 1px solid var(--c-line);
}

.footer-inner {
  max-width: var(--w-shell);
  margin: 0 auto;
  padding: 40px 24px 24px;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 32px;
}

.footer-brand {
  max-width: 320px;
}

.footer-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--c-text);
}

.footer-desc {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-muted);
}

.footer-group-title {
  font-size: 13px;
  font-weight: 600;
  font-family: var(--font-mono);
  letter-spacing: 0.6px;
  color: var(--c-muted);
  margin-bottom: 12px;
}

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

.footer-list a {
  display: inline-block;
  min-height: 28px;
  font-size: 14px;
  color: var(--c-text);
}

.footer-list a:hover {
  color: var(--c-primary);
}

.footer-bottom {
  max-width: var(--w-shell);
  margin: 0 auto;
  padding: 16px 24px 28px;
  border-top: 1px solid var(--c-line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.footer-domain {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.4px;
  color: var(--c-muted);
}

.footer-note {
  font-size: 13px;
  color: var(--c-muted);
}

/* 面包屑 · 页面标题区 · 内页两栏 */

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 13px;
  font-family: var(--font-mono);
  letter-spacing: 0.3px;
  color: var(--c-muted);
}

.breadcrumb a {
  color: var(--c-muted);
}

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

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

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

.page-header {
  padding: 16px 0 0;
}

.page-title {
  font-size: 32px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--c-text);
}

.page-head {
  padding: 14px 0 28px;
  border-bottom: 1px solid var(--c-line);
}

.page-lead {
  max-width: var(--w-body);
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-text);
}

.page-meta {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.3px;
  color: var(--c-muted);
}

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

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  padding-top: 32px;
}

.sidebar-left .page-layout,
.page-layout.sidebar-left {
  grid-template-columns: 220px minmax(0, 1fr);
}

.page-aside,
.toc {
  align-self: start;
}

.page-aside {
  position: sticky;
  top: 88px;
}

.toc-title,
.aside-title {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.6px;
  color: var(--c-muted);
  margin-bottom: 12px;
}

.toc-list li + li {
  margin-top: 2px;
}

.toc-list a,
.toc-link {
  display: block;
  min-height: 34px;
  padding: 6px 10px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--c-text);
  border-left: 2px solid var(--c-line);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.toc-list a:hover,
.toc-link:hover {
  color: var(--c-primary);
  border-left-color: var(--c-primary);
  background-color: rgba(31, 111, 235, 0.06);
}

.page-body,
.page-content,
.content-body {
  min-width: 0;
  max-width: var(--w-body);
}

/* --------------------------------------------------------------------------
   components · 通用模块
   -------------------------------------------------------------------------- */

/* 按钮 */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

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

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

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

.btn-ghost:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
}

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

.btn-secondary:hover {
  background-color: rgba(31, 111, 235, 0.08);
  color: var(--c-primary-dark);
}

/* 分节标题 */

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

.section-index,
.section-num,
.section-no,
.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.8px;
  color: var(--c-muted);
}

.section-num,
.section-no {
  margin-right: 10px;
  color: var(--c-primary);
}

.section-tag {
  margin-left: 12px;
  padding: 1px 8px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  color: var(--c-muted);
}

.section-index {
  display: block;
  margin-bottom: 8px;
}

.section-head h2 {
  font-size: 22px;
}

.section-title {
  font-size: 22px;
  font-weight: 600;
  line-height: 1.4;
}

.section-intro {
  max-width: var(--w-body);
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text);
}

.section-desc {
  max-width: var(--w-body);
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text);
}

.section-note {
  max-width: var(--w-body);
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-muted);
}

.section-text {
  max-width: var(--w-body);
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
}

.section-more {
  margin-top: 20px;
  font-size: 14px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: 14px;
  color: var(--c-primary);
  border-bottom: 1px solid rgba(31, 111, 235, 0.35);
}

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

/* 边界提示块 */

.boundary-note {
  margin-top: 20px;
  padding: 16px 18px;
  background-color: var(--c-note-bg);
  border: 1px solid #f0dcbd;
  border-radius: var(--radius);
  color: var(--c-note-text);
}

.boundary-title,
.boundary-note-title {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.6;
}

.boundary-list {
  margin-top: 8px;
}

.boundary-list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
}

.boundary-list li + li {
  margin-top: 4px;
}

.boundary-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--c-note-text);
}

/* 清单类容器 */

.check-list {
  margin-top: 16px;
}

.check-list > li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.8;
}

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

.check-list > li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--c-green);
}

.check-item .check-title {
  font-size: 15px;
  font-weight: 600;
}

.check-item .check-desc {
  margin-top: 4px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-muted);
}

.check-item + .check-item {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--c-line);
}

.num-list {
  margin-top: 16px;
  counter-reset: num;
}

.num-list > li {
  position: relative;
  padding-left: 34px;
  font-size: 15px;
  line-height: 1.8;
  counter-increment: num;
}

.num-list > li + li {
  margin-top: 12px;
}

.num-list > li::before {
  content: counter(num, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.4px;
  color: var(--c-primary);
}

/* 图片容器 */

.doc-figure,
.section-figure,
.section-media,
.qa-media,
.content-figure,
.standards-media,
.hero-media {
  overflow: hidden;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background-color: var(--c-panel);
}

.doc-figure img,
.section-figure img,
.section-media img,
.qa-media img,
.content-figure img,
.standards-media img,
.hero-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

/* 表格 */

.table-wrap {
  margin-top: 18px;
  overflow-x: auto;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background-color: var(--c-panel);
}

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

.table-caption {
  padding: 12px 16px;
  text-align: left;
  font-size: 13px;
  font-family: var(--font-mono);
  letter-spacing: 0.4px;
  color: var(--c-muted);
  border-bottom: 1px solid var(--c-line);
}

.compare-table th,
.compare-table td,
.data-table th,
.data-table td {
  padding: 12px 16px;
  text-align: left;
  vertical-align: top;
  line-height: 1.7;
  border-bottom: 1px solid var(--c-line);
}

.compare-table thead th,
.data-table thead th {
  font-weight: 600;
  font-size: 13px;
  background-color: #f2f5f8;
  color: var(--c-text);
  white-space: nowrap;
}

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

/* 相关页面条 */

.related,
.related-pages,
.related-strip {
  max-width: var(--w-shell);
  margin: 0 auto;
  padding: 32px 24px 0;
}

.related-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 14px;
}

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

.related-list > li > a,
.related-link {
  display: block;
  min-height: 44px;
  padding: 12px 16px;
  font-size: 14px;
  color: var(--c-text);
  background-color: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.related-list > li > a:hover,
.related-link:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
}

.related-name {
  display: block;
  font-weight: 600;
}

.related-desc {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-muted);
}

.related-links {
  max-width: var(--w-shell);
  margin: 0 auto;
  padding: 24px 24px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.related-links-label {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.4px;
  color: var(--c-muted);
}

.related-links-item {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 6px 14px;
  font-size: 14px;
  color: var(--c-text);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-sm);
  background-color: var(--c-panel);
}

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

/* 折叠问答 · 首页 */

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

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

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 52px;
  padding: 14px 0;
  font-size: 16px;
  font-weight: 600;
  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: 15px;
  color: var(--c-muted);
}

.faq-item[open] .faq-question::after {
  content: "－";
  color: var(--c-primary);
}

.faq-answer {
  padding: 0 0 18px;
  max-width: var(--w-body);
}

.faq-answer p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text);
}

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

/* 折叠问答 · 常见问题页 */

.qa-list {
  margin-top: 16px;
  border-top: 1px solid var(--c-line);
}

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

.qa-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 52px;
  padding: 14px 0;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

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

.qa-question::after {
  content: "＋";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--c-muted);
}

.qa-item[open] .qa-question::after {
  content: "－";
  color: var(--c-primary);
}

.qa-answer {
  padding: 0 0 18px;
  max-width: var(--w-body);
  font-size: 15px;
  line-height: 1.8;
}

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

.qa-sublist {
  margin-top: 10px;
}

.qa-sublist li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
}

.qa-sublist li + li {
  margin-top: 6px;
}

.qa-sublist li::before {
  content: "·";
  position: absolute;
  left: 4px;
  color: var(--c-primary);
}

/* --------------------------------------------------------------------------
   pages · 首页
   -------------------------------------------------------------------------- */

/* 首屏 */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
  padding: 56px 0 48px;
}

.hero-text {
  max-width: 560px;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.8px;
  color: var(--c-primary);
}

.hero-text h1 {
  margin-top: 14px;
  font-size: 38px;
  font-weight: 600;
  line-height: 1.3;
}

.hero-lead {
  margin-top: 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-text);
}

.hero-note {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-muted);
}

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

.hero-media {
  margin: 0;
}

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

/* 快捷入口条 */

.entry-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background-color: var(--c-panel);
  overflow: hidden;
}

.entry-item {
  display: block;
  padding: 18px 20px;
  min-height: 44px;
  color: var(--c-text);
  border-right: 1px solid var(--c-line);
}

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

.entry-item:hover {
  color: var(--c-primary);
  background-color: rgba(31, 111, 235, 0.05);
}

.entry-name {
  display: block;
  font-size: 15px;
  font-weight: 600;
}

.entry-desc {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-muted);
}

/* 服务能力矩阵 */

.services-overview {
  padding: 64px 0 0;
}

.service-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--c-line);
}

.service-column {
  padding: 24px 24px 24px 0;
  border-right: 1px solid var(--c-line);
}

.service-column:last-child {
  border-right: 0;
  padding-right: 0;
}

.service-column h3 {
  font-size: 17px;
  font-weight: 600;
}

.service-column > p {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-muted);
}

.service-list {
  margin-top: 14px;
}

.service-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
}

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

.service-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--c-green);
}

/* 交付流程四步 */

.process {
  padding: 64px 0 0;
}

.process-track {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--c-line);
}

.process-step {
  padding: 22px 20px 22px 0;
  border-right: 1px solid var(--c-line);
}

.process-step:last-child {
  border-right: 0;
  padding-right: 0;
}

.process-step .step-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.8px;
  color: var(--c-primary);
}

.process-step h3 {
  margin-top: 10px;
  font-size: 16px;
  font-weight: 600;
}

.process-step > p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-text);
}

.process-step .step-output {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--c-line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-muted);
}

/* 适用场景区 */

.scenarios {
  padding: 64px 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 48px;
  align-items: start;
}

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

.scenario-group {
  padding: 20px 0;
  border-top: 1px solid var(--c-line);
}

.scenario-group h3 {
  font-size: 17px;
  font-weight: 600;
}

.scenario-need {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-muted);
}

.scenario-list {
  margin-top: 12px;
}

.scenario-list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.8;
}

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

.scenario-list li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--c-green);
}

.topic-toc {
  position: sticky;
  top: 88px;
  padding-left: 24px;
  border-left: 1px solid var(--c-line);
}

/* 交付标准摘要 */

.standards {
  padding: 64px 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: 40px;
  align-items: start;
}

.standards-media {
  margin: 0;
}

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

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

.standards-body h2 {
  margin-top: 8px;
  font-size: 22px;
}

.standards-body > p {
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
}

.standards-list {
  margin-top: 18px;
  counter-reset: std;
}

.standards-list li {
  position: relative;
  padding-left: 34px;
  font-size: 15px;
  line-height: 1.8;
  counter-increment: std;
}

.standards-list li + li {
  margin-top: 12px;
}

.standards-list li::before {
  content: counter(std, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-primary);
}

/* 首页问答 */

.faq {
  padding: 64px 0 0;
}

/* 合作对接入口 */

.start-cta {
  margin-top: 64px;
  padding: 32px;
  background-color: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.start-cta h2 {
  font-size: 22px;
}

.start-cta > p {
  max-width: var(--w-body);
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
}

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

/* --------------------------------------------------------------------------
   pages · 服务能力
   -------------------------------------------------------------------------- */

.page-services .doc-section {
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--c-line);
}

.page-services .doc-section:last-child {
  border-bottom: 0;
  margin-bottom: 0;
}

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

.doc-section > p {
  max-width: var(--w-body);
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
}

.doc-section .doc-figure {
  margin-top: 18px;
}

.board-grid {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.board-item {
  padding: 16px 18px;
  background-color: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.board-item:hover {
  border-color: var(--c-primary);
}

.board-item h3 {
  font-size: 15px;
  font-weight: 600;
}

.board-item p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-text);
}

.board-item p + p {
  color: var(--c-muted);
}

/* --------------------------------------------------------------------------
   pages · 交付标准
   -------------------------------------------------------------------------- */

.page-delivery .content-section {
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--c-line);
}

.page-delivery .content-section:last-child {
  border-bottom: 0;
  margin-bottom: 0;
}

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

.content-section > p {
  max-width: var(--w-body);
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
}

.stage-track {
  margin-top: 22px;
}

.stage-item {
  position: relative;
  padding: 0 0 24px 28px;
  border-left: 1px solid var(--c-line);
}

.stage-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.stage-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--c-green);
}

.stage-item .stage-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.8px;
  color: var(--c-primary);
}

.stage-item .stage-name {
  margin-top: 6px;
  font-size: 17px;
  font-weight: 600;
}

.stage-item .stage-desc {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-text);
}

.stage-item .stage-output {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-muted);
}

.stage-item .stage-output-label {
  font-family: var(--font-mono);
  letter-spacing: 0.4px;
  color: var(--c-muted);
}

.page-delivery .section-figure {
  margin-top: 18px;
}

/* --------------------------------------------------------------------------
   pages · 适用场景
   -------------------------------------------------------------------------- */

.page-scenarios .content-section {
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--c-line);
}

.page-scenarios .content-section:last-child {
  border-bottom: 0;
  margin-bottom: 0;
}

.page-scenarios .section-head h2 {
  font-size: 22px;
  font-weight: 600;
}

.page-scenarios .section-media {
  margin-top: 18px;
}

.scene-grid {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.scene-item {
  padding: 16px 18px;
  background-color: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.scene-item:hover {
  border-color: var(--c-primary);
}

.scene-title {
  font-size: 15px;
  font-weight: 600;
}

.scene-desc {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
}

.scene-match {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-muted);
}

.numbered-list {
  margin-top: 18px;
  counter-reset: mis;
}

.numbered-item {
  position: relative;
  padding-left: 34px;
  counter-increment: mis;
}

.numbered-item + .numbered-item {
  margin-top: 16px;
}

.numbered-item::before {
  content: counter(mis, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-primary);
}

.numbered-title {
  font-size: 15px;
  font-weight: 600;
}

.numbered-desc {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.8;
}

/* --------------------------------------------------------------------------
   pages · 常见问题
   -------------------------------------------------------------------------- */

.page-faq .qa-group {
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--c-line);
}

.page-faq .qa-group:last-child {
  border-bottom: 0;
  margin-bottom: 0;
}

.page-faq .qa-group h2 {
  font-size: 22px;
  font-weight: 600;
}

.page-faq .qa-media {
  margin-top: 18px;
}

.next-links {
  margin-top: 18px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.next-card {
  display: block;
  min-height: 44px;
  padding: 14px 16px;
  background-color: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  color: var(--c-text);
}

.next-card:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
}

.next-card-name {
  display: block;
  font-size: 15px;
  font-weight: 600;
}

.next-card-desc {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-muted);
}

/* --------------------------------------------------------------------------
   pages · 关于
   -------------------------------------------------------------------------- */

.page-about .content-section {
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--c-line);
}

.page-about .content-section:last-child {
  border-bottom: 0;
  margin-bottom: 0;
}

.page-about .content-section h2 {
  font-size: 22px;
  font-weight: 600;
}

.page-about .content-section > p {
  max-width: var(--w-body);
  margin-top: 12px;
  font-size: 15px;
  line-height: 1.8;
}

.page-about .content-section h3 {
  margin-top: 22px;
  font-size: 17px;
  font-weight: 600;
}

.page-about .content-figure {
  margin-top: 18px;
}

.page-about .page-info {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  font-size: 13px;
}

.page-about .page-info dt {
  font-family: var(--font-mono);
  letter-spacing: 0.4px;
  color: var(--c-muted);
}

.page-about .page-info dd {
  margin: 0;
  color: var(--c-text);
}

.principle-list {
  margin-top: 18px;
  counter-reset: prin;
}

.principle-list li {
  position: relative;
  padding-left: 34px;
  counter-increment: prin;
}

.principle-list li + li {
  margin-top: 16px;
}

.principle-list li::before {
  content: counter(prin, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-primary);
}

.principle-list h3 {
  font-size: 15px;
  font-weight: 600;
}

.principle-list p {
  margin-top: 6px;
  font-size: 14px;
  line-height: 1.8;
}

/* --------------------------------------------------------------------------
   pages · 合作对接
   -------------------------------------------------------------------------- */

.page-start .section {
  padding-bottom: 32px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--c-line);
}

.page-start .section:last-child {
  border-bottom: 0;
  margin-bottom: 0;
}

.page-start .section h2 {
  font-size: 22px;
  font-weight: 600;
}

.step-list {
  margin-top: 22px;
}

.step-item {
  position: relative;
  padding: 0 0 24px 28px;
  border-left: 1px solid var(--c-line);
}

.step-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.step-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background-color: var(--c-green);
}

.step-item .step-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.8px;
  color: var(--c-primary);
}

.step-item .step-name {
  margin-top: 6px;
  font-size: 17px;
  font-weight: 600;
}

.step-item .step-desc {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.8;
}

.step-item .step-done {
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-muted);
}

.card-grid {
  margin-top: 20px;
  display: grid;
  gap: 16px;
}

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

.info-card {
  padding: 16px 18px;
  background-color: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.info-card:hover {
  border-color: var(--c-primary);
}

.info-card .card-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.6px;
  color: var(--c-muted);
}

.info-card .card-title {
  margin-top: 8px;
  font-size: 15px;
  font-weight: 600;
}

.info-card .card-text {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
}

.cta-row {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* --------------------------------------------------------------------------
   pages · 404
   -------------------------------------------------------------------------- */

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

.error-block {
  max-width: 640px;
  margin: 0 auto;
  padding: 72px 0 0;
}

.error-code {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 1px;
  color: var(--c-primary);
}

.error-title {
  margin-top: 12px;
  font-size: 30px;
  font-weight: 600;
}

.error-text {
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-text);
}

.error-text + .error-text {
  color: var(--c-muted);
}

.error-links {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.error-links a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 12px 16px;
  font-size: 14px;
  color: var(--c-text);
  background-color: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.error-links a:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
}

/* --------------------------------------------------------------------------
   responsive
   -------------------------------------------------------------------------- */

@media (max-width: 1100px) {
  .hero {
    gap: 32px;
  }

  .scenarios {
    grid-template-columns: minmax(0, 1fr) 220px;
    gap: 32px;
  }
}

@media (max-width: 900px) {
  .header-inner {
    padding: 0 16px;
    min-height: 60px;
    flex-wrap: wrap;
    gap: 0;
  }

  .nav-toggle {
    display: flex;
  }

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

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 12px;
    border-top: 1px solid var(--c-line);
  }

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

  .nav-link {
    min-height: 48px;
    padding: 0 4px;
    border-bottom: 1px solid var(--c-line);
  }

  .nav-link.is-current {
    border-bottom-color: var(--c-line);
    color: var(--c-primary);
  }

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

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

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    padding: 36px 0 32px;
  }

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

  .hero-text h1 {
    font-size: 28px;
  }

  .hero-media {
    order: 2;
  }

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

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

  .entry-item:nth-child(2n) {
    border-right: 0;
  }

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

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

  .service-column {
    padding: 20px 0;
    border-right: 0;
    border-bottom: 1px solid var(--c-line);
  }

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

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

  .process-step {
    padding: 18px 0;
    border-right: 0;
    border-bottom: 1px solid var(--c-line);
  }

  .process-step:last-child {
    border-bottom: 0;
  }

  .scenarios {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .topic-toc {
    position: static;
    padding-left: 0;
    padding-top: 20px;
    border-left: 0;
    border-top: 1px solid var(--c-line);
    order: 2;
  }

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

  .page-layout,
  .sidebar-left .page-layout,
  .page-layout.sidebar-left {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .page-aside {
    position: static;
    order: 2;
    padding-top: 16px;
    border-top: 1px solid var(--c-line);
  }

  .toc-list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .toc-list li {
    flex: 0 0 auto;
  }

  .toc-list a,
  .toc-link {
    border-left: 0;
    border: 1px solid var(--c-line);
    border-radius: var(--radius-sm);
    white-space: nowrap;
    padding: 8px 12px;
  }

  .board-grid,
  .scene-grid,
  .card-grid-2,
  .next-links {
    grid-template-columns: minmax(0, 1fr);
  }

  .related,
  .related-pages,
  .related-strip,
  .related-links {
    padding-left: 16px;
    padding-right: 16px;
  }

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

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding: 32px 16px 20px;
  }

  .footer-brand {
    max-width: none;
  }

  .footer-bottom {
    padding: 16px 16px 24px;
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  .hero-text h1 {
    font-size: 24px;
  }

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

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

  .start-cta {
    padding: 22px 18px;
  }

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

  .section-title,
  .section-head h2,
  .content-section h2,
  .doc-section h2,
  .page-about .content-section h2,
  .page-start .section h2,
  .standards-body h2,
  .start-cta h2 {
    font-size: 19px;
  }
}