/* ==========================================================================
   每天吃瓜 · 全站样式
   分组：base / layout / components / pages / responsive
   ========================================================================== */

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

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

:root {
  --ink: #16181D;
  --ink-soft: #2B2F37;
  --muted: #6B7078;
  --accent: #C93B24;
  --accent-dark: #A62E1B;
  --mark: #FFC24B;
  --teal: #1F9D8B;
  --paper: #F5F6F4;
  --white: #FFFFFF;
  --line: #E1E3DF;
  --line-strong: #C8CCC5;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-soft: 0 1px 2px rgba(22, 24, 29, 0.06);
  --container: 1160px;
  --gutter: 24px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", sans-serif;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background: var(--white);
}

h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

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

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

a:hover,
a:focus-visible {
  color: var(--accent-dark);
}

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

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

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

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

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

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

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--white);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
}

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

.header-inner,
.footer-inner,
.footer-bottom,
.hero,
.services,
.pick,
.flow,
.insights,
.approach,
.faq,
.coop-inner,
.inner-main > .breadcrumb,
.inner-main > .page-header,
.inner-main > .page-hero,
.inner-main > .page-layout,
.inner-main > .section,
.inner-main > .approach-principles,
.inner-main > .approach-schedule,
.inner-main > .approach-visual,
.inner-main > .approach-division,
.inner-main > .coop-prep,
.inner-main > .coop-boundary,
.inner-main > .coop-steps,
.inner-main > .coop-media,
.inner-main > .coop-guide,
.inner-main > .entry-band,
.inner-main > .related-links,
.error-panel {
  width: 100%;
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* 页头 */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  width: 100%;
  background: var(--white);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
  padding-top: 10px;
  padding-bottom: 10px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  color: var(--ink);
  flex-shrink: 0;
}

.brand:hover,
.brand:focus-visible {
  color: var(--ink);
}

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

.brand-slogan {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.04em;
  padding-left: 10px;
  border-left: 1px solid var(--line-strong);
}

.site-nav {
  display: flex;
  align-items: center;
  flex: 1 1 auto;
  justify-content: flex-end;
}

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

.nav-link {
  display: inline-block;
  padding: 8px 12px;
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink-soft);
  border-radius: var(--radius-sm);
  border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--accent);
  background: var(--paper);
}

.nav-link.is-current {
  color: var(--accent);
  font-weight: 700;
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--white);
}

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

.mobile-nav {
  display: none;
}

/* 页脚 */

.site-footer {
  margin-top: 64px;
  background: var(--ink);
  color: #D8DBD6;
  font-size: 14px;
  line-height: 1.7;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 40px;
  padding-top: 48px;
  padding-bottom: 36px;
}

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

.footer-brand-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}

.footer-brand-desc {
  color: #B6BAB4;
  margin-bottom: 14px;
}

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

.footer-boundary li {
  position: relative;
  padding-left: 14px;
  color: #9AA09A;
  font-size: 13px;
}

.footer-boundary li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--mark);
  border-radius: 1px;
}

.footer-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.04em;
  margin-bottom: 14px;
}

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

.footer-links a {
  color: #C9CDC7;
  font-size: 14px;
}

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

.footer-note {
  margin-top: 14px;
  color: #9AA09A;
  font-size: 13px;
  line-height: 1.65;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 18px;
  padding-bottom: 22px;
  border-top: 1px solid #30343B;
  font-size: 13px;
  color: #9AA09A;
}

.footer-bottom-left,
.footer-bottom-right {
  margin: 0;
}

/* 内页骨架 */

.inner-main {
  padding-bottom: 8px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  padding-top: 22px;
  font-size: 13px;
  color: var(--muted);
}

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

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

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

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

.page-header {
  padding-top: 14px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 32px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
  max-width: 900px;
}

.page-lead {
  margin-top: 12px;
  max-width: 720px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.page-title-block {
  display: flex;
  flex-direction: column;
}

.page-title-block .page-lead {
  margin-top: 12px;
}

.page-title-block .page-tags {
  margin-top: 16px;
}

/* 双栏内页 */

.page-layout {
  display: grid;
  gap: 40px;
  padding-top: 8px;
  padding-bottom: 8px;
}

.sidebar-left {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  align-items: start;
}

.sidebar-left > aside {
  position: sticky;
  top: 88px;
  min-width: 0;
}

.sidebar-left > .page-content,
.sidebar-left > .layout-main,
.sidebar-left > .faq-content {
  min-width: 0;
}

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

/* 按钮 */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.btn-primary {
  background: var(--accent);
  color: var(--white);
  border-color: var(--accent);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: var(--white);
}

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

.btn-ghost:hover,
.btn-ghost:focus-visible {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--white);
}

/* 标签 */

.tag {
  display: inline-block;
  padding: 2px 10px;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.tag-accent {
  color: var(--accent);
  background: #FDF1E6;
  border-color: #F2C9AE;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.tag-inline {
  display: inline-block;
  padding: 1px 8px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--accent);
  background: #FDF1E6;
  border: 1px solid #F2C9AE;
  border-radius: var(--radius-sm);
}

/* 文本链 */

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  border-bottom: 1px solid transparent;
}

.text-link::after {
  content: "→";
  font-size: 14px;
  transition: transform 160ms ease;
}

.text-link:hover,
.text-link:focus-visible {
  color: var(--accent-dark);
  border-bottom-color: var(--accent-dark);
}

.text-link:hover::after,
.text-link:focus-visible::after {
  transform: translateX(3px);
}

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

/* 区块头 */

.section-head {
  margin-bottom: 26px;
}

.section-head h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
}

.section-intro,
.section-desc {
  margin-top: 8px;
  max-width: 720px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
}

/* 分类树 */

.tree-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-transform: uppercase;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 12px;
}

.tree-subtitle {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin: 20px 0 10px;
}

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

.tree-link {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-soft);
  border-left: 3px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.tree-link:hover,
.tree-link:focus-visible {
  color: var(--accent);
  background: var(--paper);
}

.tree-link.is-current,
.tree-item.is-active > .tree-link {
  color: var(--accent);
  font-weight: 700;
  background: #FDF1E6;
  border-left-color: var(--accent);
}

.tree-note {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

.tree-group + .tree-group {
  margin-top: 18px;
}

.tree-group-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

/* 折叠问答 */

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

.faq-item {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}

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

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

.faq-question {
  position: relative;
  display: block;
  padding: 16px 48px 16px 18px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--ink);
  cursor: pointer;
  list-style: none;
}

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

.faq-question::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  line-height: 1;
  color: var(--accent);
  transition: transform 160ms ease;
}

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

.faq-answer {
  padding: 0 18px 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

/* 表格 */

.spec-table,
.data-table {
  width: 100%;
  font-size: 15px;
  line-height: 1.75;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.spec-table th,
.spec-table td,
.data-table th,
.data-table td {
  padding: 14px 18px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

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

.spec-table th,
.data-table th {
  width: 26%;
  font-weight: 700;
  color: var(--ink);
  background: var(--paper);
  white-space: nowrap;
}

.spec-table td,
.data-table td {
  color: var(--ink-soft);
}

/* 入口带 */

.entry-band {
  margin-top: 48px;
  margin-bottom: 8px;
  background: var(--ink);
  color: #E4E6E2;
  border-radius: var(--radius-lg);
  padding: 32px var(--gutter);
}

.entry-band-inner {
  max-width: var(--container);
  margin: 0 auto;
}

.entry-band-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}

.entry-band-text {
  max-width: 720px;
  font-size: 15px;
  line-height: 1.8;
  color: #C6CAC4;
}

.entry-band-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.entry-band .btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--white);
}

.entry-band .btn-primary:hover,
.entry-band .btn-primary:focus-visible {
  background: #E04A30;
  border-color: #E04A30;
  color: var(--white);
}

.entry-band .btn-ghost {
  background: transparent;
  color: var(--white);
  border-color: #4B5059;
}

.entry-band .btn-ghost:hover,
.entry-band .btn-ghost:focus-visible {
  color: var(--mark);
  border-color: var(--mark);
  background: transparent;
}

.entry-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 18px;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  border: 1px solid #4B5059;
  border-radius: var(--radius-md);
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.entry-link:hover,
.entry-link:focus-visible {
  color: var(--mark);
  border-color: var(--mark);
}

.entry-band-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 15px;
  font-weight: 700;
  color: var(--mark);
  border-bottom: 1px solid transparent;
}

.entry-band-link:hover,
.entry-band-link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

.entry-text {
  max-width: 720px;
  font-size: 15px;
  line-height: 1.8;
  color: #C6CAC4;
  margin-bottom: 16px;
}

/* 相关内容条 */

.related-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  margin-top: 32px;
  margin-bottom: 8px;
  padding-top: 20px;
  padding-bottom: 20px;
  border-top: 1px solid var(--line);
}

.related-links-label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.related-links-item {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 15px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line-strong);
}

.related-links-item:hover,
.related-links-item:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* 图片容器 */

.hero-visual,
.pick-media,
.insight-media,
.service-figure,
.process-figure,
.note-media,
.figure,
.media-figure,
.page-hero-media {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--paper);
}

.hero-visual img,
.pick-media img,
.insight-media img,
.service-figure img,
.process-figure img,
.note-media img,
.figure img,
.media-figure img,
.page-hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure-caption {
  padding: 8px 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  background: var(--white);
  border-top: 1px solid var(--line);
}

/* ==========================================================================
   pages · index
   ========================================================================== */

.home-main {
  padding-bottom: 8px;
}

.anchor-bar {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.anchor-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  max-width: var(--container);
  margin: 0 auto;
  padding: 8px var(--gutter);
}

.anchor-list a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 4px 12px;
  font-size: 14px;
  color: var(--ink-soft);
  border-radius: var(--radius-sm);
}

.anchor-list a:hover,
.anchor-list a:focus-visible {
  color: var(--accent);
  background: var(--white);
}

/* 首屏 */

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

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

.hero-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--teal);
  padding: 3px 10px;
  background: #E8F5F2;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--ink);
}

.hero-lead {
  margin-top: 18px;
  max-width: 560px;
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.fact-tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}

.fact-tag::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 6px;
  vertical-align: middle;
  background: var(--mark);
  border-radius: 1px;
}

.hero-visual {
  position: relative;
  aspect-ratio: 4 / 3;
  min-height: 0;
}

.hero-badge {
  position: absolute;
  left: 16px;
  bottom: 16px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  background: var(--mark);
  border-radius: var(--radius-sm);
}

/* 首页服务矩阵 */

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

.service-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--line);
}

.service-row {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.6fr);
  gap: 24px;
  padding: 22px 4px;
  border-bottom: 1px solid var(--line);
  transition: background-color 160ms ease;
}

.service-row:hover {
  background: var(--paper);
}

.service-name {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-width: 0;
}

.service-num {
  flex-shrink: 0;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--accent);
}

.service-name h3 {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.service-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 28px;
  min-width: 0;
}

.field {
  min-width: 0;
}

.field-label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 4px;
}

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

/* 主推荐 */

.pick {
  padding-top: 48px;
  padding-bottom: 48px;
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.pick-main {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.4fr);
  gap: 28px;
  align-items: center;
  padding: 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: transform 160ms ease, border-color 160ms ease;
}

.pick-main:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
}

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

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

.pick-body h3 {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.45;
  margin-top: 10px;
  color: var(--ink);
}

.pick-body p {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.pick-body .text-link {
  margin-top: 16px;
}

.pick-sub-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 18px;
  border-top: 1px solid var(--line-strong);
}

.pick-sub {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 4px;
  border-bottom: 1px solid var(--line-strong);
  transition: background-color 160ms ease;
}

.pick-sub:hover {
  background: rgba(255, 255, 255, 0.7);
}

.pick-sub a {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 15px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--ink);
}

.pick-sub a::after {
  content: "→";
  margin-left: 8px;
  font-weight: 400;
  color: var(--accent);
}

.pick-sub a:hover,
.pick-sub a:focus-visible {
  color: var(--accent);
}

/* 流程 */

.flow {
  padding-top: 48px;
  padding-bottom: 48px;
}

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

.flow-step {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px;
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 3px solid var(--teal);
  border-radius: var(--radius-md);
  transition: transform 160ms ease, border-color 160ms ease;
}

.flow-step:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
  border-top-color: var(--accent);
}

.flow-num {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--teal);
}

.flow-name {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.flow-text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* 专题观察 */

.insights {
  padding-top: 48px;
  padding-bottom: 48px;
  background: var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.insight-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-auto-rows: auto;
  gap: 20px;
  align-items: start;
}

.insight-card {
  display: flex;
  flex-direction: column;
  padding: 16px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  transition: transform 160ms ease, border-color 160ms ease;
}

.insight-card:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
}

.insight-card:nth-child(1) .insight-media {
  aspect-ratio: 16 / 10;
}

.insight-card:nth-child(2) .insight-media {
  aspect-ratio: 4 / 3;
}

.insight-card:nth-child(3) .insight-media {
  aspect-ratio: 16 / 9;
}

.insight-card .tag {
  align-self: flex-start;
  margin-top: 14px;
}

.insight-card h3 {
  margin-top: 10px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
}

.insight-card h3 a {
  color: var(--ink);
}

.insight-card h3 a:hover,
.insight-card h3 a:focus-visible {
  color: var(--accent);
}

.insight-card p {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.insight-entry {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
  padding: 24px;
  background: var(--ink);
  color: #D8DBD6;
  border-radius: var(--radius-lg);
}

.insight-entry h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
}

.insight-entry p {
  font-size: 14px;
  line-height: 1.75;
  color: #B6BAB4;
}

.insight-entry .text-link {
  color: var(--mark);
  align-self: flex-start;
}

.insight-entry .text-link:hover,
.insight-entry .text-link:focus-visible {
  color: var(--white);
  border-bottom-color: var(--white);
}

/* 工作方式摘要 */

.approach {
  padding-top: 48px;
  padding-bottom: 48px;
}

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

.principle-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.principle-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  grid-template-areas:
    "num name"
    "num text";
  gap: 4px 12px;
  padding: 16px 18px;
  background: var(--paper);
  border-radius: var(--radius-md);
}

.principle-num {
  grid-area: num;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--accent);
}

.principle-name {
  grid-area: name;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.principle-text {
  grid-area: text;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.approach-note {
  padding: 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--mark);
  border-radius: var(--radius-md);
}

.approach-note p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.approach-note p + p {
  margin-top: 12px;
}

.approach-note .text-link {
  margin-top: 16px;
}

/* 首页问答 */

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

/* 首页合作说明带 */

.coop {
  padding-top: 8px;
  padding-bottom: 8px;
}

.coop-inner {
  background: var(--ink);
  color: #E4E6E2;
  border-radius: var(--radius-lg);
  padding: 36px var(--gutter);
}

.coop-inner h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--white);
}

.coop-inner p {
  max-width: 720px;
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.8;
  color: #C6CAC4;
}

.coop-inner .btn {
  margin-top: 20px;
}

/* ==========================================================================
   pages · services
   ========================================================================== */

.page-hero {
  padding-top: 20px;
  padding-bottom: 24px;
}

.page-hero > .page-lead {
  margin-top: 0;
}

.page-hero > .tag-row {
  margin-top: 16px;
}

.service-block {
  padding: 26px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.service-block + .service-block {
  margin-top: 24px;
}

.service-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.service-head .service-num {
  font-size: 18px;
}

.service-head .service-name {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.service-tagline {
  flex: 1 1 240px;
  min-width: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.service-body {
  padding-top: 16px;
}

.service-desc {
  max-width: 720px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.service-figure {
  margin: 18px 0;
  aspect-ratio: 16 / 9;
}

.service-field {
  margin-top: 20px;
  min-width: 0;
}

.service-field .field-label {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink);
  margin-bottom: 8px;
}

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

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

.field-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--teal);
  border-radius: 1px;
}

/* ==========================================================================
   pages · process
   ========================================================================== */

.section {
  padding-top: 36px;
  padding-bottom: 8px;
}

.stage-timeline {
  display: flex;
  flex-direction: column;
  gap: 18px;
  counter-reset: stage;
}

.stage-item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.stage-index {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  font-size: 18px;
  font-weight: 700;
  color: var(--teal);
  background: #E8F5F2;
  border-radius: var(--radius-md);
}

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

.stage-name {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.stage-intro {
  margin-top: 6px;
  max-width: 720px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.stage-fields {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px 24px;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--line-strong);
}

.field-row {
  min-width: 0;
}

.field-row dt {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 4px;
}

.field-row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.process-figure {
  margin-top: 32px;
  aspect-ratio: 16 / 7;
}

.process-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  background: var(--white);
  border-top: 1px solid var(--line);
}

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

.division-col {
  min-width: 0;
  padding: 22px;
  background: var(--paper);
  border-radius: var(--radius-md);
}

.division-title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  margin-bottom: 12px;
}

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

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

.division-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 1px;
}

.adjust-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.adjust-item {
  padding: 18px 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--mark);
  border-radius: var(--radius-md);
}

.adjust-name {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.adjust-item p {
  margin-top: 6px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ==========================================================================
   pages · insights
   ========================================================================== */

.notes-section + .notes-section,
.structure-section {
  margin-top: 36px;
}

.notes-section > .section-intro {
  margin-bottom: 18px;
}

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

.note-card {
  display: flex;
  flex-direction: column;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 160ms ease, border-color 160ms ease;
}

.note-card:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
}

.note-media {
  aspect-ratio: 16 / 10;
  border-radius: 0;
}

.note-body {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px;
  min-width: 0;
}

.note-title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

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

.note-title a:hover,
.note-title a:focus-visible {
  color: var(--accent);
}

.note-excerpt {
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.structure-section > .section-title {
  margin-bottom: 16px;
}

.structure-split {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 32px;
  align-items: start;
  padding: 24px;
  background: var(--paper);
  border-radius: var(--radius-lg);
}

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

.structure-text p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.structure-text p + p {
  margin-top: 12px;
}

.structure-points {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.structure-point {
  position: relative;
  padding: 12px 14px 12px 34px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  counter-increment: structure;
}

.structure-points {
  counter-reset: structure;
}

.structure-point::before {
  content: counter(structure);
  position: absolute;
  left: 12px;
  top: 13px;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
}

/* ==========================================================================
   pages · approach
   ========================================================================== */

.approach-principles,
.approach-schedule,
.approach-visual,
.approach-division {
  padding-top: 36px;
  padding-bottom: 8px;
}

.page-hero-inner {
  max-width: 720px;
}

.page-hero-inner .page-lead {
  margin-top: 0;
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  align-items: stretch;
}

.principle-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius-md);
}

.principle-card .principle-num {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.principle-card .principle-name {
  font-size: 17px;
}

.principle-card .principle-text {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.schedule-table-wrap {
  overflow-x: auto;
}

.approach-visual {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px;
  align-items: center;
}

.visual-media {
  min-width: 0;
}

.figure {
  aspect-ratio: 4 / 3;
}

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

.visual-copy .section-title {
  margin-bottom: 12px;
}

.visual-copy p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.visual-copy p + p {
  margin-top: 12px;
}

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

.division-grid .division-col {
  background: var(--paper);
}

.division-subtitle {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  margin-bottom: 12px;
}

.archive-note {
  margin-top: 24px;
  padding: 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--teal);
  border-radius: var(--radius-md);
}

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

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

.archive-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--teal);
  border-radius: 1px;
}

/* ==========================================================================
   pages · faq
   ========================================================================== */

.faq-hero {
  padding-top: 8px;
  padding-bottom: 28px;
}

.faq-hero .page-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 32px;
  align-items: center;
  max-width: none;
}

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

.page-hero-lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-hero-copy .tag-row {
  margin-top: 16px;
}

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

.page-hero-media figcaption {
  padding: 8px 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  background: var(--white);
  border-top: 1px solid var(--line);
}

.faq-layout {
  padding-top: 0;
}

.faq-content {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

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

.group-title {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 12px;
}

.group-lead {
  margin-bottom: 14px;
  max-width: 720px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.faq-group .faq-item + .faq-item {
  margin-top: 10px;
}

/* ==========================================================================
   pages · cooperation
   ========================================================================== */

.coop-prep,
.coop-boundary,
.coop-steps,
.coop-media,
.coop-guide {
  padding-top: 36px;
  padding-bottom: 8px;
}

.coop-prep h2,
.coop-boundary h2,
.coop-steps h2,
.coop-media h2,
.coop-guide h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.numbered-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 18px;
  border-top: 1px solid var(--line);
}

.numbered-item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 16px 4px;
  border-bottom: 1px solid var(--line);
}

.item-index {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--accent);
}

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

.item-title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.item-desc {
  margin-top: 4px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.boundary-columns {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 18px;
}

.boundary-col {
  min-width: 0;
  padding: 22px;
  background: var(--paper);
  border-radius: var(--radius-md);
}

.col-title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
  margin-bottom: 12px;
}

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

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

.boundary-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--teal);
  border-radius: 1px;
}

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

.step-item {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  grid-template-areas:
    "index title"
    "index desc";
  align-content: start;
  gap: 4px 12px;
  min-width: 0;
  padding: 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
}

.step-index {
  grid-area: index;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--teal);
}

.step-title {
  grid-area: title;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.step-desc {
  grid-area: desc;
  min-width: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  overflow-wrap: break-word;
}

.coop-media {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px;
  align-items: center;
}

.media-figure {
  min-width: 0;
  aspect-ratio: 4 / 3;
}

.media-figure figcaption {
  padding: 8px 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
  background: var(--white);
  border-top: 1px solid var(--line);
}

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

.media-copy p {
  margin-top: 10px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.guide-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: 20px;
  background: var(--paper);
  border-radius: var(--radius-md);
}

.guide-title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.guide-desc {
  flex: 1 1 auto;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.guide-link {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  border-bottom: 1px solid transparent;
}

.guide-link:hover,
.guide-link:focus-visible {
  color: var(--accent-dark);
  border-bottom-color: var(--accent-dark);
}

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

.error-main {
  display: flex;
  align-items: center;
  padding-top: 64px;
  padding-bottom: 64px;
}

.error-panel {
  max-width: 720px;
  margin: 0 auto;
  padding: 40px var(--gutter);
  text-align: left;
  background: var(--paper);
  border-radius: var(--radius-lg);
}

.error-code {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.error-title {
  margin-top: 10px;
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
}

.error-desc {
  margin-top: 12px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.error-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line-strong);
}

.error-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 15px;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line-strong);
}

.error-links a:hover,
.error-links a:focus-visible {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

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

@media (max-width: 960px) {
  :root {
    --gutter: 20px;
  }

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

  .brand-slogan {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    flex: 0 0 auto;
  }

  .nav-list {
    display: none;
  }

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

  .mobile-nav {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 80;
    background: var(--white);
    padding: 20px var(--gutter) 32px;
    overflow-y: auto;
  }

  .mobile-nav[hidden] {
    display: none;
  }

  .mobile-nav-close {
    position: absolute;
    top: 14px;
    right: var(--gutter);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    font-size: 0;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
  }

  .mobile-nav-close::before,
  .mobile-nav-close::after {
    content: "";
    position: absolute;
    width: 20px;
    height: 2px;
    background: var(--ink);
  }

  .mobile-nav-close::before {
    transform: rotate(45deg);
  }

  .mobile-nav-close::after {
    transform: rotate(-45deg);
  }

  .mobile-nav-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin-top: 56px;
  }

  .mobile-nav-list a {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: 10px 4px;
    font-size: 17px;
    color: var(--ink);
    border-bottom: 1px solid var(--line);
  }

  .mobile-nav-list a:hover,
  .mobile-nav-list a:focus-visible,
  .mobile-nav-list a.is-current {
    color: var(--accent);
  }

  .hero {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding-top: 36px;
    padding-bottom: 40px;
  }

  .hero h1 {
    font-size: 32px;
  }

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

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

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

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

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

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
  }

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

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

  .sidebar-left > aside {
    position: static;
    padding: 16px;
    background: var(--paper);
    border-radius: var(--radius-md);
  }

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

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

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

  .approach-visual,
  .coop-media {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

  .coop-media .media-figure {
    order: -1;
  }

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

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

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

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

@media (max-width: 640px) {
  :root {
    --gutter: 16px;
  }

  body {
    font-size: 15px;
  }

  .hero h1 {
    font-size: 26px;
  }

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

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

  .hero-lead,
  .page-lead {
    font-size: 15px;
  }

  .hero-actions .btn,
  .error-actions .btn {
    flex: 1 1 auto;
    min-height: 48px;
  }

  .anchor-list {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .anchor-list::-webkit-scrollbar {
    display: none;
  }

  .anchor-list a {
    flex: 0 0 auto;
    white-space: nowrap;
  }

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

  .pick-sub {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }

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

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

  .insight-card:nth-child(1) .insight-media,
  .insight-card:nth-child(2) .insight-media,
  .insight-card:nth-child(3) .insight-media {
    aspect-ratio: 16 / 10;
  }

  .principle-item {
    grid-template-columns: 32px minmax(0, 1fr);
    padding: 14px;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
    padding-top: 32px;
    padding-bottom: 24px;
  }

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

  .page-header {
    padding-top: 10px;
    padding-bottom: 16px;
    margin-bottom: 24px;
  }

  .page-layout {
    gap: 24px;
  }

  .service-block {
    padding: 18px;
  }

  .service-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .stage-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 12px;
    padding: 18px;
  }

  .stage-index {
    width: 44px;
    height: 44px;
    font-size: 16px;
  }

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

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

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

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

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

  .numbered-item {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 12px;
  }

  .spec-table th,
  .spec-table td,
  .data-table th,
  .data-table td {
    display: block;
    width: 100%;
    padding: 10px 14px;
  }

  .spec-table th,
  .data-table th {
    border-bottom: 0;
    padding-bottom: 2px;
    background: transparent;
    white-space: normal;
  }

  .spec-table td,
  .data-table td {
    padding-top: 0;
  }

  .spec-table tr,
  .data-table tr {
    display: block;
    padding: 10px 0;
    border-bottom: 1px solid var(--line);
  }

  .spec-table tr:last-child,
  .data-table tr:last-child {
    border-bottom: 0;
  }

  .entry-band {
    padding: 24px 18px;
  }

  .entry-band-links .btn,
  .entry-band-links .entry-link {
    flex: 1 1 auto;
    justify-content: center;
    min-height: 48px;
  }

  .related-links {
    gap: 8px 16px;
  }

  .error-panel {
    padding: 28px 18px;
  }

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

/* 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;
  }
}