/* ==========================================================================
   9色视频 · wx196.com — 全站样式表
   分组：base / layout / components / pages / responsive
   ========================================================================== */

/* ==========================================================================
   base — 变量、重置、排版
   ========================================================================== */

:root {
  --bg-page: #f7f8f6;
  --bg-surface: #ffffff;
  --bg-subtle: #eef1ed;
  --ink: #1f2933;
  --ink-soft: #4b5560;
  --ink-mute: #6b7480;
  --brand: #1f6f5c;
  --brand-strong: #0b6b5b;
  --brand-soft: #e3efea;
  --accent: #c27a2c;
  --accent-soft: #f6ecdf;
  --footer-bg: #17212b;
  --footer-ink: #c9d1d6;
  --line: #d8ddd7;
  --line-strong: #b9c1ba;
  --radius-sm: 4px;
  --radius: 6px;
  --radius-lg: 8px;
  --shadow-card: 0 1px 2px rgba(23, 33, 43, 0.06);
  --shadow-raise: 0 4px 14px rgba(23, 33, 43, 0.08);
  --shell: 1120px;
  --content: 760px;
  --aside: 260px;
  --gap-col: 40px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans CJK SC", "WenQuanYi Micro Hei",
    system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

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

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

body {
  margin: 0;
  background-color: var(--bg-page);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

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

h1 {
  font-size: 32px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

p {
  margin: 0 0 14px;
  color: var(--ink-soft);
}

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

ul,
ol {
  margin: 0 0 14px;
  padding-left: 20px;
  color: var(--ink-soft);
}

li {
  margin-bottom: 6px;
}

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

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

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

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

img {
  max-width: 100%;
  height: auto;
  border: 0;
}

figure {
  margin: 0;
}

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

dl {
  margin: 0;
}

dt {
  color: var(--ink);
  font-weight: 600;
}

dd {
  margin: 0 0 10px;
  color: var(--ink-soft);
}

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

th,
td {
  text-align: left;
  vertical-align: top;
}

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

/* ==========================================================================
   layout — 全站骨架：页头、导航、主容器、页脚
   ========================================================================== */

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 24px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: var(--ink);
  text-decoration: none;
}

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

.brand-name {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--brand);
}

.brand-slogan {
  font-size: 12px;
  line-height: 1.4;
  color: var(--ink-mute);
}

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 44px;
  height: 44px;
  padding: 10px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  cursor: pointer;
  flex-direction: column;
  justify-content: space-between;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--ink);
  border-radius: 1px;
}

.primary-nav.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list li {
  margin: 0;
}

.nav-list a {
  display: block;
  padding: 10px 10px;
  min-height: 44px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 24px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--brand-strong);
  background-color: var(--brand-soft);
  text-decoration: none;
}

.nav-list a.is-current {
  color: var(--brand-strong);
  font-weight: 600;
  background-color: var(--brand-soft);
  box-shadow: inset 0 -2px 0 var(--brand-strong);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  background-color: var(--brand);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  white-space: nowrap;
}

.nav-cta:hover,
.nav-cta:focus-visible {
  background-color: var(--brand-strong);
  color: #ffffff;
  text-decoration: none;
}

.nav-cta.is-current {
  background-color: var(--brand-strong);
}

.site-main {
  flex: 1 0 auto;
  display: block;
}

.inner-main {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px 64px;
}

/* 内页两栏：主内容在前，摘要栏在后 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--aside);
  gap: var(--gap-col);
  align-items: start;
  margin-top: 8px;
}

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

.page-aside,
.sidebar {
  min-width: 0;
  position: sticky;
  top: 96px;
  align-self: start;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
}

/* 面包屑与页面标题区（全站内页统一） */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 24px 0 12px;
  font-size: 13px;
  color: var(--ink-mute);
}

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

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

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

.breadcrumb-current {
  color: var(--ink);
  font-weight: 600;
}

.page-head,
.page-header {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 28px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.3;
}

h1.page-title {
  margin: 0;
}

.page-lead,
.page-lede,
.page-kicker,
.page-title-desc {
  margin: 10px 0 0;
  max-width: var(--content);
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.75;
}

.page-kicker {
  display: inline-block;
  padding: 2px 10px;
  background-color: var(--brand-soft);
  color: var(--brand-strong);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.page-title > .page-lead,
.page-title > .page-lede,
.page-title > .page-kicker,
.page-title > .page-title-desc {
  margin-top: 8px;
}

/* 页脚（全站统一） */
.site-footer {
  margin-top: 40px;
  background-color: var(--footer-bg);
  color: var(--footer-ink);
}

.footer-inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 44px 24px 24px;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) 2fr;
  gap: 32px 48px;
}

.footer-brand-name {
  display: block;
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
}

.footer-brand-desc {
  margin: 10px 0 0;
  max-width: 320px;
  color: var(--footer-ink);
  font-size: 14px;
  line-height: 1.7;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px 32px;
}

.footer-col-title {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 600;
  color: #ffffff;
}

.footer-col ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.footer-col a {
  display: inline-block;
  padding: 4px 0;
  color: var(--footer-ink);
  font-size: 14px;
}

.footer-col a:hover,
.footer-col a:focus-visible {
  color: #ffffff;
}

.footer-bottom {
  grid-column: 1 / -1;
  margin-top: 8px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
}

.footer-boundary {
  margin: 0;
  max-width: 620px;
  color: var(--footer-ink);
  font-size: 13px;
  line-height: 1.7;
}

.footer-meta {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer-copy {
  margin: 0;
  color: var(--footer-ink);
  font-size: 13px;
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: var(--radius);
  color: #ffffff;
  font-size: 14px;
  white-space: nowrap;
}

.back-to-top:hover,
.back-to-top:focus-visible {
  background-color: rgba(255, 255, 255, 0.12);
  color: #ffffff;
  text-decoration: none;
}

/* ==========================================================================
   components — 通用组件
   ========================================================================== */

/* 按钮 */
.btn,
.btn-primary,
.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 11px 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
}

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

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

.btn-ghost,
.btn.btn-ghost {
  background-color: var(--bg-surface);
  border-color: var(--line-strong);
  color: var(--ink);
}

.btn-ghost:hover,
.btn-ghost:focus-visible,
.btn.btn-ghost:hover,
.btn.btn-ghost:focus-visible {
  border-color: var(--brand);
  color: var(--brand-strong);
  background-color: var(--brand-soft);
  text-decoration: none;
}

/* 文本链接 */
.text-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  color: var(--brand);
  border-bottom: 1px solid transparent;
}

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

.link-more {
  display: inline-block;
  margin-top: 12px;
  font-size: 15px;
  font-weight: 600;
}

/* 图片容器统一约束 */
.hero-media,
.overview-media,
.path-media,
.section-media,
.flow-figure,
.spec-figure,
.content-figure,
.aside-media {
  overflow: hidden;
  border-radius: var(--radius-lg);
  background-color: var(--bg-subtle);
}

.hero-media img,
.overview-media img,
.path-media img,
.section-media img,
.flow-figure img,
.spec-figure img,
.content-figure img,
.aside-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 数据表格 */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background-color: var(--bg-surface);
}

.data-table {
  width: 100%;
  min-width: 560px;
  font-size: 15px;
}

.data-table caption {
  padding: 12px 16px;
  text-align: left;
  color: var(--ink-mute);
  font-size: 13px;
}

.data-table th,
.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
}

.data-table thead th {
  background-color: var(--bg-subtle);
  color: var(--ink);
  font-weight: 600;
  white-space: nowrap;
}

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

.data-table tbody tr:hover {
  background-color: #f2f6f3;
}

/* 标签 */
.changelog-tag {
  display: inline-block;
  padding: 2px 10px;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.7;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  color: var(--ink-soft);
  background-color: var(--bg-subtle);
}

.changelog-tag-new {
  color: var(--brand-strong);
  background-color: var(--brand-soft);
  border-color: #bcd9d0;
}

.changelog-tag-adjust {
  color: #8a5a1a;
  background-color: var(--accent-soft);
  border-color: #e6cfae;
}

.changelog-tag-fix {
  color: var(--ink-soft);
  background-color: #eef1f3;
  border-color: var(--line-strong);
}

/* FAQ 折叠组 */
.faq-group {
  display: grid;
  gap: 10px;
}

.faq-item {
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.faq-item[open] {
  border-color: var(--line-strong);
}

.faq-question {
  cursor: pointer;
  padding: 14px 44px 14px 18px;
  min-height: 44px;
  color: var(--ink);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.6;
  list-style: none;
  position: relative;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--brand);
  font-size: 20px;
  line-height: 1;
}

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

.faq-question:hover {
  color: var(--brand-strong);
}

.faq-answer {
  padding: 0 18px 16px;
  border-top: 1px solid var(--line);
}

.faq-answer p {
  margin-top: 14px;
}

/* 通用区块标题（内页 content-section 体系） */
.section-heading {
  margin: 0 0 10px;
  font-size: 22px;
}

.section-intro {
  margin: 0 0 20px;
  color: var(--ink-soft);
  font-size: 15px;
}

.content-section {
  margin-bottom: 40px;
}

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

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

.home-main {
  display: block;
}

.section {
  padding: 56px 0;
  border-bottom: 1px solid var(--line);
}

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

.section-inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
}

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

.section-head h2 {
  margin: 0 0 10px;
}

.section-desc {
  margin: 0;
  color: var(--ink-soft);
  font-size: 15px;
}

.section-foot {
  margin: 22px 0 0;
}

/* 首屏 */
.hero {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--line);
}

.hero-inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 48px 24px 56px;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 1fr);
  gap: 40px;
  align-items: start;
}

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

.hero-eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding: 3px 12px;
  background-color: var(--brand-soft);
  color: var(--brand-strong);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.hero-copy h1 {
  margin: 0 0 16px;
  font-size: 34px;
  line-height: 1.3;
}

.hero-lead {
  margin: 0 0 22px;
  max-width: 620px;
  color: var(--ink-soft);
  font-size: 16px;
}

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

.hero-media {
  margin: 0;
}

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

.hero-index {
  min-width: 0;
  padding: 24px;
  background-color: var(--bg-page);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.hero-index-block {
  padding-bottom: 18px;
  margin-bottom: 18px;
  border-bottom: 1px dashed var(--line-strong);
}

.hero-index-block:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}

.hero-index-title {
  margin: 0 0 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.hero-index-note {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--ink-mute);
}

.index-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}

.index-list li {
  margin: 0;
}

.index-list a {
  display: block;
  padding: 6px 0;
  color: var(--ink-soft);
  font-size: 15px;
}

.index-list a:hover,
.index-list a:focus-visible {
  color: var(--brand-strong);
}

/* 服务概览 */
.overview-lead {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(240px, 320px);
  gap: 28px;
  align-items: center;
  padding: 20px 24px;
  margin-bottom: 24px;
  background-color: var(--brand-soft);
  border-left: 3px solid var(--brand);
  border-radius: var(--radius-lg);
}

.overview-conclusion {
  margin: 0;
  color: var(--ink);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.7;
}

.overview-media {
  margin: 0;
}

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

.catalog-rows {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.catalog-row {
  margin: 0;
  padding: 20px 24px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  display: grid;
  grid-template-columns: minmax(180px, 1fr) minmax(0, 2.2fr);
  gap: 8px 28px;
  align-items: baseline;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.catalog-row:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-raise);
}

.catalog-row-title {
  margin: 0;
  font-size: 18px;
}

.catalog-row-title a {
  color: var(--ink);
}

.catalog-row-title a:hover,
.catalog-row-title a:focus-visible {
  color: var(--brand-strong);
}

.catalog-row-audience {
  margin: 0;
  color: var(--brand-strong);
  font-size: 14px;
  font-weight: 600;
}

.catalog-row-desc {
  margin: 0;
  grid-column: 2;
  color: var(--ink-soft);
  font-size: 15px;
}

/* 项目类型索引 */
.project-index .data-table {
  min-width: 620px;
}

/* 制作路径 */
.step-track {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.step-item {
  margin: 0;
  padding: 16px 14px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-top: 3px solid var(--brand);
  border-radius: var(--radius-lg);
  min-width: 0;
}

.step-no {
  display: block;
  margin-bottom: 8px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.step-title {
  margin: 0 0 8px;
  font-size: 16px;
}

.step-io {
  margin: 0 0 6px;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ink-soft);
}

.step-io:last-child {
  margin-bottom: 0;
}

.path-media {
  margin: 28px 0 0;
}

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

.checkpoint-block {
  margin-top: 24px;
  padding: 20px 24px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.checkpoint-title {
  margin: 0 0 12px;
  font-size: 18px;
}

.checkpoint-list {
  margin: 0;
  padding-left: 20px;
}

.checkpoint-list li {
  font-size: 15px;
}

/* 交付规格与规范变更 */
.duo-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.spec-summary,
.changelog-summary {
  min-width: 0;
  padding: 24px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.duo-title {
  margin: 0 0 14px;
  font-size: 18px;
}

.spec-list {
  margin: 0 0 14px;
}

.spec-list dt {
  font-size: 14px;
  color: var(--ink-mute);
  font-weight: 600;
}

.spec-list dd {
  margin: 2px 0 12px;
  color: var(--ink);
  font-size: 15px;
}

.spec-list dd:last-child {
  margin-bottom: 0;
}

.changelog-list {
  margin: 0 0 14px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.changelog-list li {
  margin: 0;
  padding-left: 16px;
  border-left: 2px solid var(--line-strong);
  font-size: 15px;
  color: var(--ink-soft);
}

/* 职能速览 */
.role-grid {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.role-card {
  margin: 0;
  padding: 18px 16px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  min-width: 0;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.role-card:hover {
  border-color: var(--brand);
  transform: translateY(-2px);
}

.role-title {
  margin: 0 0 8px;
  font-size: 16px;
}

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

/* 常见问题预览 */
.faq-preview .faq-group {
  max-width: var(--content);
}

/* 合作准备 */
.prep-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  counter-reset: prep;
}

.prep-item {
  margin: 0;
  padding: 22px 22px 24px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  min-width: 0;
}

.prep-title {
  margin: 0 0 10px;
  font-size: 17px;
}

.prep-title::before {
  counter-increment: prep;
  content: counter(prep, decimal-leading-zero);
  display: block;
  margin-bottom: 6px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

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

.page-service-catalog .page-head {
  margin-bottom: 20px;
}

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

.service-line-card {
  min-width: 0;
  padding: 22px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.service-line-card:hover {
  border-color: var(--brand);
  box-shadow: var(--shadow-raise);
}

.service-line-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
}

.service-line-card p {
  font-size: 15px;
}

.service-line-meta {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-strong);
}

.service-line-meta dt {
  font-size: 13px;
  color: var(--ink-mute);
}

.service-line-meta dd {
  margin: 2px 0 10px;
  font-size: 14px;
  color: var(--ink-soft);
}

.service-line-meta dd:last-child {
  margin-bottom: 0;
}

.service-fit .section-media {
  margin: 0 0 22px;
}

.service-fit .section-media img {
  aspect-ratio: 16 / 9;
}

.fit-table {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--bg-surface);
}

.fit-row {
  display: grid;
  grid-template-columns: minmax(120px, 1fr) minmax(140px, 1.2fr) minmax(0, 2fr);
  gap: 0 20px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
}

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

.fit-head {
  background-color: var(--bg-subtle);
  font-weight: 600;
  color: var(--ink);
}

.fit-cell {
  min-width: 0;
  font-size: 15px;
  color: var(--ink-soft);
}

.fit-head .fit-cell {
  color: var(--ink);
}

.issue-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: issue;
  display: grid;
  gap: 14px;
}

.issue-item {
  margin: 0;
  padding: 18px 20px 18px 56px;
  position: relative;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  min-width: 0;
}

.issue-item::before {
  counter-increment: issue;
  content: counter(issue);
  position: absolute;
  left: 18px;
  top: 18px;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--brand-soft);
  color: var(--brand-strong);
  font-size: 13px;
  font-weight: 700;
  border-radius: 50%;
}

.issue-item h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.issue-item p {
  margin: 0;
  font-size: 15px;
}

.combo-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.combo-card {
  min-width: 0;
  padding: 20px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.combo-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
}

.combo-card p {
  font-size: 14.5px;
}

.next-links,
.related-links {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.next-links li,
.related-links li {
  margin: 0;
}

.next-links a,
.related-links a {
  display: block;
  padding: 14px 18px;
  min-height: 44px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  color: var(--ink);
  font-size: 15px;
  font-weight: 600;
}

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

/* 内页摘要栏通用 */
.aside-inner,
.aside-block {
  min-width: 0;
  padding: 18px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

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

.aside-title {
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.aside-list,
.aside-links,
.aside-toc {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}

.aside-list li,
.aside-links li,
.aside-toc li {
  margin: 0;
}

.aside-list a,
.aside-links a,
.aside-toc a {
  display: block;
  padding: 6px 0;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.6;
}

.aside-list a:hover,
.aside-links a:hover,
.aside-toc a:hover,
.aside-list a:focus-visible,
.aside-links a:focus-visible,
.aside-toc a:focus-visible {
  color: var(--brand-strong);
}

.aside-text {
  margin: 10px 0 0;
  font-size: 13.5px;
  color: var(--ink-mute);
}

.aside-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

/* ==========================================================================
   pages — 项目类型档案
   ========================================================================== */

.goal-list {
  display: grid;
  gap: 12px;
}

.goal-row {
  min-width: 0;
  padding: 18px 20px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--brand);
  border-radius: var(--radius-lg);
  display: grid;
  grid-template-columns: minmax(140px, 1fr) minmax(0, 2.4fr);
  gap: 6px 24px;
  align-items: baseline;
}

.goal-name {
  margin: 0;
  font-size: 17px;
}

.goal-body {
  min-width: 0;
  font-size: 15px;
  color: var(--ink-soft);
}

.goal-body p {
  margin: 0 0 6px;
  font-size: 15px;
}

.goal-body p:last-child {
  margin-bottom: 0;
}

.section-format .section-media {
  margin: 0 0 22px;
}

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

.section-note {
  margin: 16px 0 0;
  font-size: 15px;
}

.prepare-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: prepare;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.prepare-item {
  margin: 0;
  padding: 20px 20px 20px 58px;
  position: relative;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  min-width: 0;
}

.prepare-item::before {
  counter-increment: prepare;
  content: counter(prepare, decimal-leading-zero);
  position: absolute;
  left: 20px;
  top: 22px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
}

.prepare-name {
  margin: 0 0 8px;
  font-size: 16px;
}

.prepare-item p {
  margin: 0;
  font-size: 14.5px;
}

/* ==========================================================================
   pages — 制作流程
   ========================================================================== */

.page-production-flow .flow-path,
.page-production-flow .flow-io,
.page-production-flow .flow-coop,
.page-production-flow .flow-qc,
.page-production-flow .flow-accept,
.page-production-flow .flow-next {
  margin-bottom: 40px;
}

.page-production-flow .flow-next {
  margin-bottom: 0;
}

.flow-figure {
  margin: 0 0 26px;
}

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

.flow-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
  counter-reset: flow;
}

.flow-step {
  margin: 0;
  padding: 20px 22px 20px 66px;
  position: relative;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  min-width: 0;
}

.flow-step::before {
  content: "";
  position: absolute;
  left: 30px;
  top: 44px;
  bottom: -16px;
  width: 1px;
  background-color: var(--line-strong);
}

.flow-step:last-child::before {
  display: none;
}

.flow-step-index {
  position: absolute;
  left: 18px;
  top: 20px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--brand);
  color: #ffffff;
  font-size: 13px;
  font-weight: 700;
  border-radius: 50%;
}

.flow-step-name {
  margin: 0 0 8px;
  font-size: 17px;
}

.flow-step-desc {
  margin: 0 0 10px;
  font-size: 15px;
}

.flow-step-meta {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 20px;
  padding-top: 10px;
  border-top: 1px dashed var(--line-strong);
}

.flow-step-meta dt {
  font-size: 13px;
  color: var(--ink-mute);
}

.flow-step-meta dd {
  margin: 2px 0 0;
  font-size: 14.5px;
  color: var(--ink-soft);
}

.io-table {
  width: 100%;
  min-width: 520px;
  font-size: 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--bg-surface);
}

.io-table caption {
  padding: 12px 16px;
  text-align: left;
  color: var(--ink-mute);
  font-size: 13px;
}

.io-table th,
.io-table td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
}

.io-table thead th {
  background-color: var(--bg-subtle);
  color: var(--ink);
  font-weight: 600;
}

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

.flow-io {
  overflow-x: auto;
}

.coop-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

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

.coop-col h3 {
  margin: 0 0 12px;
  font-size: 17px;
}

.coop-list {
  margin: 0;
  padding-left: 18px;
}

.coop-list li {
  font-size: 14.5px;
}

.qc-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.qc-group {
  margin: 0;
  padding: 18px 20px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  min-width: 0;
}

.qc-group h3 {
  margin: 0 0 10px;
  font-size: 16px;
}

.qc-group ul {
  margin: 0;
  padding-left: 18px;
}

.qc-group li {
  font-size: 14.5px;
}

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

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

.accept-col h3 {
  margin: 0 0 12px;
  font-size: 17px;
}

.accept-list {
  margin: 0;
  padding-left: 18px;
}

.accept-list li {
  font-size: 14.5px;
}

.accept-note {
  margin: 16px 0 0;
  font-size: 15px;
}

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

/* ==========================================================================
   pages — 交付规格
   ========================================================================== */

.page-media-specs .spec-section {
  margin-bottom: 40px;
}

.page-media-specs .spec-section:last-of-type {
  margin-bottom: 0;
}

.spec-table {
  width: 100%;
  min-width: 520px;
  font-size: 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--bg-surface);
}

.spec-table caption {
  padding: 12px 16px;
  text-align: left;
  color: var(--ink-mute);
  font-size: 13px;
}

.spec-table th,
.spec-table td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--line);
}

.spec-table thead th {
  background-color: var(--bg-subtle);
  color: var(--ink);
  font-weight: 600;
}

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

.spec-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 20px;
}

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

.spec-col h3 {
  margin: 0 0 10px;
  font-size: 16px;
}

.spec-col p {
  margin: 0;
  font-size: 14.5px;
}

.naming-list {
  margin: 0 0 20px;
  padding-left: 20px;
}

.naming-list li {
  font-size: 15px;
}

.spec-figure {
  margin: 24px 0;
}

.spec-figure img {
  aspect-ratio: 16 / 9;
}

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

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

.quality-card h3 {
  margin: 0 0 10px;
  font-size: 16px;
}

.quality-card ul {
  margin: 0;
  padding-left: 18px;
}

.quality-card li {
  font-size: 14.5px;
}

/* ==========================================================================
   pages — 职能说明
   ========================================================================== */

.page-team-roles .content-section {
  margin-bottom: 36px;
}

.page-team-roles .content-section h2 {
  margin: 0 0 10px;
}

.role-list {
  margin: 0 0 14px;
  padding-left: 20px;
}

.role-list li {
  font-size: 15px;
}

.section-link {
  margin: 0;
  font-size: 15px;
}

.section-link a + a {
  margin-left: 16px;
}

.content-figure {
  margin: 0 0 36px;
}

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

/* ==========================================================================
   pages — 规范变更
   ========================================================================== */

.page-spec-changelog .content-section {
  margin-bottom: 40px;
}

.page-spec-changelog .changelog-list {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-spec-changelog .changelog-item {
  margin: 0;
  padding: 20px 22px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--line-strong);
  border-radius: var(--radius-lg);
  min-width: 0;
}

.page-spec-changelog #new-specs .changelog-item {
  border-left-color: var(--brand);
}

.page-spec-changelog #adjusted-specs .changelog-item {
  border-left-color: var(--accent);
}

.page-spec-changelog #fixed-specs .changelog-item {
  border-left-color: var(--ink-mute);
}

.changelog-name {
  margin: 10px 0 8px;
  font-size: 17px;
}

.changelog-desc {
  margin: 0 0 12px;
  font-size: 15px;
}

.changelog-meta {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-strong);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 20px;
}

.changelog-meta dt {
  font-size: 13px;
  color: var(--ink-mute);
}

.changelog-meta dd {
  margin: 2px 0 0;
  font-size: 14.5px;
  color: var(--ink-soft);
}

.step-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: vcheck;
  display: grid;
  gap: 14px;
}

.page-spec-changelog .step-item {
  margin: 0;
  padding: 18px 20px 18px 62px;
  position: relative;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  min-width: 0;
}

.page-spec-changelog .step-number {
  position: absolute;
  left: 20px;
  top: 20px;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--brand-soft);
  color: var(--brand-strong);
  font-size: 13px;
  font-weight: 700;
  border-radius: 50%;
}

.page-spec-changelog .step-title {
  margin: 0 0 6px;
  font-size: 16px;
}

.page-spec-changelog .step-desc {
  margin: 0 0 8px;
  font-size: 14.5px;
}

.page-spec-changelog .step-link {
  margin: 0;
  font-size: 14.5px;
}

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

.related-card {
  min-width: 0;
  padding: 20px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.related-card:hover {
  border-color: var(--brand);
  box-shadow: var(--shadow-raise);
}

.related-title {
  margin: 0 0 8px;
  font-size: 16px;
}

.related-desc {
  margin: 0 0 12px;
  font-size: 14.5px;
}

.related-link {
  font-size: 14.5px;
  font-weight: 600;
}

.aside-media {
  margin: 0 0 16px;
}

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

.aside-caption {
  margin-top: 0;
  padding: 8px 12px 10px;
  background-color: var(--bg-subtle);
  font-size: 12.5px;
}

.aside-tag-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.aside-tag-item {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: var(--ink-soft);
}

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

.page-questions .content-block {
  margin-bottom: 40px;
}

.page-questions .content-block:last-of-type {
  margin-bottom: 0;
}

.page-questions .content-block h2 {
  margin: 0 0 10px;
}

.block-intro {
  margin: 0 0 18px;
  color: var(--ink-soft);
  font-size: 15px;
}

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

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

.scope-col--confirm {
  border-top: 3px solid var(--brand);
}

.scope-col--limit {
  border-top: 3px solid var(--accent);
}

.scope-col h3 {
  margin: 0 0 12px;
  font-size: 17px;
}

.scope-list {
  margin: 0;
  padding-left: 18px;
}

.scope-list li {
  font-size: 14.5px;
}

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

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

.link-card-title {
  margin: 0 0 8px;
  font-size: 16px;
}

.link-card-title a {
  color: var(--ink);
}

.link-card-title a:hover,
.link-card-title a:focus-visible {
  color: var(--brand-strong);
}

.link-card-desc {
  margin: 0;
  font-size: 14.5px;
}

/* 常见问题页侧栏 */
.sidebar-inner {
  min-width: 0;
  padding: 18px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.sidebar-title {
  margin: 0 0 10px;
  font-size: 15px;
  font-weight: 700;
}

.sidebar-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
}

.sidebar-list li {
  margin: 0;
}

.sidebar-list a {
  display: block;
  padding: 6px 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.sidebar-list a:hover,
.sidebar-list a:focus-visible {
  color: var(--brand-strong);
}

.sidebar-note {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--line-strong);
}

.sidebar-note h3 {
  margin: 0 0 6px;
  font-size: 14px;
}

.sidebar-note p {
  margin: 0;
  font-size: 13.5px;
  color: var(--ink-mute);
}

.sidebar-links {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.sidebar-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
}

.sidebar-links a:hover,
.sidebar-links a:focus-visible {
  border-color: var(--brand);
  background-color: var(--brand-soft);
  color: var(--brand-strong);
  text-decoration: none;
}

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

.error-main {
  display: flex;
  justify-content: center;
  padding: 72px 24px 88px;
}

.error-inner {
  width: 100%;
  max-width: 720px;
  padding: 40px 36px;
  background-color: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
}

.error-code {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.error-title {
  margin: 0 0 14px;
  font-size: 30px;
}

.error-desc {
  margin: 0 0 24px;
  color: var(--ink-soft);
  font-size: 16px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

.error-links {
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.error-links-title {
  margin: 0 0 12px;
  font-size: 16px;
}

.error-link-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.error-link-list li {
  margin: 0;
}

.error-link-list a {
  display: block;
  padding: 12px 14px;
  min-height: 44px;
  background-color: var(--bg-page);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  font-size: 14.5px;
  font-weight: 600;
}

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

/* 滚动出现动画（仅增强，不影响初始可见） */
@media (prefers-reduced-motion: no-preference) {
  .section,
  .content-section,
  .content-block,
  .spec-section {
    animation: rise-in 0.4s ease-out both;
  }

  @keyframes rise-in {
    from {
      transform: translateY(6px);
    }
    to {
      transform: translateY(0);
    }
  }
}

/* ==========================================================================
   responsive — 断点适配
   ========================================================================== */

@media (max-width: 1080px) {
  .role-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .hero-inner {
    grid-template-columns: minmax(0, 1fr) minmax(260px, 0.9fr);
    gap: 32px;
  }
}

@media (max-width: 960px) {
  .header-inner {
    padding: 10px 20px;
  }

  .nav-toggle {
    display: flex;
  }

  .primary-nav.site-nav {
    order: 3;
    width: 100%;
    margin-left: 0;
    display: block;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 10px 0 4px;
    border-top: 1px solid var(--line);
  }

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

  .nav-list a {
    padding: 12px 10px;
    min-height: 44px;
    font-size: 16px;
    white-space: normal;
  }

  .nav-cta {
    display: none;
  }

  .inner-main {
    padding: 0 20px 56px;
  }

  /* 侧栏回到正文之前 */
  .page-layout {
    display: flex;
    flex-direction: column;
    gap: 24px;
  }

  .page-content,
  .main-content {
    max-width: none;
    order: 2;
  }

  .page-aside,
  .sidebar {
    position: static;
    max-height: none;
    overflow: visible;
    order: 1;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    padding: 36px 20px 44px;
  }

  .hero-index {
    order: 2;
  }

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

  .overview-media {
    order: -1;
  }

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

  .catalog-row-audience,
  .catalog-row-desc {
    grid-column: 1;
  }

  .duo-column,
  .prepare-list,
  .qc-list,
  .accept-grid,
  .scope-columns,
  .related-grid,
  .link-cards,
  .next-links,
  .related-links {
    grid-template-columns: minmax(0, 1fr);
  }

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

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

  .fit-head {
    display: none;
  }

  .fit-cell {
    position: relative;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    padding: 36px 20px 20px;
  }

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

@media (max-width: 720px) {
  body {
    font-size: 15.5px;
  }

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

  h2 {
    font-size: 20px;
  }

  h3 {
    font-size: 17px;
  }

  .hero-copy h1 {
    font-size: 27px;
  }

  .section {
    padding: 40px 0;
  }

  .section-inner {
    padding: 0 20px;
  }

  .role-grid,
  .step-track,
  .coop-grid,
  .combo-grid,
  .spec-columns,
  .service-line-grid,
  .quality-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .flow-step-meta,
  .changelog-meta {
    grid-template-columns: minmax(0, 1fr);
  }

  .error-inner {
    padding: 32px 22px;
  }

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

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

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

  .data-table,
  .io-table,
  .spec-table {
    min-width: 480px;
  }
}

@media (max-width: 430px) {
  .header-inner {
    padding: 10px 16px;
  }

  .inner-main {
    padding: 0 16px 48px;
  }

  .section-inner {
    padding: 0 16px;
  }

  .hero-inner {
    padding: 28px 16px 36px;
  }

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

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

  .footer-inner {
    padding: 32px 16px 18px;
  }

  .data-table,
  .io-table,
  .spec-table {
    min-width: 420px;
  }
}

/* 程序验收反馈：修复网格孤项 */
@media (min-width: 769px) {
  .role-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* 程序验收反馈：移动端正文优先 */
@media (max-width: 768px) {
  .site-main :is(.page-content, .main-content, .content-main) {
    order: 1;
  }

  .site-main :is(aside, .sidebar) {
    order: 2;
  }
}