/* ==========================================================================
   51黑料官网 - 整站样式表
   研究报告风：米白纸感背景、黑墨正文、朱砂强调
   ========================================================================== */

/* ==========================================================================
   Base / Reset
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 16px;
  line-height: 1.8;
  color: #1F2328;
  background-color: #F5F1E8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: #B42318;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #8A1B12;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: Georgia, 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', serif;
  line-height: 1.3;
  color: #1F2328;
  font-weight: 700;
}

h1 {
  font-size: 2.25rem;
  letter-spacing: 0.02em;
}

h2 {
  font-size: 1.5rem;
  letter-spacing: 0.02em;
}

h3 {
  font-size: 1.125rem;
  letter-spacing: 0.01em;
}

h4 {
  font-size: 1rem;
}

p {
  margin-bottom: 0.75rem;
}

blockquote {
  border-left: 3px solid #B42318;
  padding: 0.75rem 1.25rem;
  margin: 1.25rem 0;
  background-color: #EFEAE0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: #3A4148;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.925rem;
}

th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid #D8D2C5;
  vertical-align: top;
}

th {
  background-color: #EFEAE0;
  font-weight: 600;
  color: #1F2328;
}

tr:hover td {
  background-color: rgba(239, 234, 224, 0.5);
}

.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 / 全局骨架
   ========================================================================== */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: #F5F1E8;
  border-bottom: 1px solid #D8D2C5;
}

.header-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}

.brand-name {
  font-family: Georgia, 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: #1F2328;
  letter-spacing: 0.04em;
}

.brand-tag {
  font-size: 0.75rem;
  color: #5B6670;
  letter-spacing: 0.08em;
}

.site-nav {
  display: block;
}

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

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-block;
  padding: 8px 14px;
  font-size: 0.9rem;
  color: #1F2328;
  border-radius: 4px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-link:hover {
  background-color: #EFEAE0;
  color: #B42318;
}

.nav-item.is-current .nav-link,
.nav-link.is-current {
  color: #B42318;
  font-weight: 600;
  background-color: transparent;
}

.nav-item.is-current .nav-link::after,
.nav-link.is-current::after {
  content: "";
  display: block;
  height: 2px;
  background-color: #B42318;
  margin-top: 2px;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
  width: 44px;
  height: 44px;
  justify-content: center;
  align-items: center;
}

.nav-toggle-line {
  display: block;
  width: 22px;
  height: 2px;
  background-color: #1F2328;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 160px;
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(31, 35, 40, 0.08);
  padding: 6px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
  z-index: 50;
}

.nav-item.has-dropdown:hover .dropdown-menu,
.nav-item.has-dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu li a {
  display: block;
  padding: 8px 16px;
  font-size: 0.875rem;
  color: #1F2328;
}

.dropdown-menu li a:hover {
  background-color: #EFEAE0;
  color: #B42318;
}

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

.site-footer {
  background-color: #1F2328;
  color: #D8D2C5;
  margin-top: 60px;
}

.footer-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 24px;
}

.footer-brand {
  margin-bottom: 32px;
}

.footer-brand-name {
  font-family: Georgia, 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', serif;
  font-size: 1.25rem;
  color: #FFFFFF;
  margin-bottom: 4px;
}

.footer-tagline {
  font-size: 0.85rem;
  color: #9AA4AE;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-bottom: 40px;
}

.footer-group h3 {
  font-size: 0.875rem;
  color: #FFFFFF;
  margin-bottom: 12px;
  font-family: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-weight: 600;
}

.footer-group li {
  margin-bottom: 6px;
}

.footer-group a {
  color: #9AA4AE;
  font-size: 0.85rem;
  transition: color 0.2s ease;
}

.footer-group a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  border-top: 1px solid #3A4148;
  padding-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
  font-size: 0.8rem;
  color: #9AA4AE;
}

/* ==========================================================================
   内页通用骨架
   ========================================================================== */

.inner-main {
  width: 100%;
}

.breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 24px 0;
  font-size: 0.85rem;
  color: #5B6670;
  display: flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb a {
  color: #5B6670;
}

.breadcrumb a:hover {
  color: #B42318;
}

.breadcrumb-sep {
  color: #9AA4AE;
}

.breadcrumb-current {
  color: #1F2328;
  font-weight: 600;
}

.page-header {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 24px;
  border-bottom: 1px solid #D8D2C5;
  margin-bottom: 40px;
}

.page-title {
  font-size: 2rem;
  margin-bottom: 12px;
}

.page-description {
  font-size: 1rem;
  color: #5B6670;
  max-width: 760px;
  line-height: 1.8;
}

.section {
  margin-bottom: 56px;
}

.section-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-title {
  font-size: 1.375rem;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}

.section-title::after {
  content: "";
  display: block;
  width: 44px;
  height: 2px;
  background-color: #B42318;
  margin-top: 8px;
}

.section-desc {
  color: #5B6670;
  margin-bottom: 24px;
  max-width: 760px;
  font-size: 0.95rem;
}

/* ==========================================================================
   Components / 按钮
   ========================================================================== */

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 6px;
  font-size: 0.925rem;
  font-weight: 600;
  line-height: 1.5;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
  text-align: center;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-primary {
  background-color: #B42318;
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: #8A1B12;
  color: #FFFFFF;
}

.btn-secondary {
  background-color: transparent;
  color: #1F2328;
  border-color: #D8D2C5;
}

.btn-secondary:hover {
  border-color: #B42318;
  color: #B42318;
  background-color: #FFFFFF;
}

.btn-text {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 0;
  color: #B42318;
  font-weight: 600;
  font-size: 0.9rem;
  background: none;
  border: none;
  cursor: pointer;
  min-height: 44px;
}

.btn-text::after {
  content: "→";
  transition: transform 0.2s ease;
}

.btn-text:hover::after {
  transform: translateX(4px);
}

/* ==========================================================================
   Components / 首页首屏
   ========================================================================== */

.hero-section {
  border-bottom: 1px solid #D8D2C5;
  background-color: #F5F1E8;
}

.hero-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px 56px;
  display: grid;
  grid-template-columns: 1fr 480px;
  gap: 56px;
  align-items: center;
}

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

.hero-copy h1 {
  font-size: 2.25rem;
  margin-bottom: 16px;
  line-height: 1.3;
}

.hero-lead {
  font-size: 1.125rem;
  color: #B42318;
  margin-bottom: 12px;
  font-weight: 600;
}

.hero-text {
  color: #5B6670;
  margin-bottom: 24px;
  max-width: 540px;
  font-size: 0.95rem;
}

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

.hero-figure {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 20px;
  box-shadow: 0 2px 8px rgba(31, 35, 40, 0.06);
}

.hero-figure img {
  width: 100%;
  height: auto;
  border-radius: 4px;
}

.hero-figure figcaption {
  font-size: 0.8rem;
  color: #5B6670;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #D8D2C5;
  line-height: 1.6;
}

/* ==========================================================================
   Components / 首页日程轨道
   ========================================================================== */

.service-track-section {
  padding: 56px 0;
  border-bottom: 1px solid #D8D2C5;
}

.section-heading {
  max-width: 1200px;
  margin: 0 auto 32px;
  padding: 0 24px;
}

.section-heading h2 {
  font-size: 1.5rem;
  margin-bottom: 8px;
  position: relative;
  padding-bottom: 10px;
}

.section-heading h2::after {
  content: "";
  display: block;
  width: 44px;
  height: 2px;
  background-color: #B42318;
  margin-top: 8px;
}

.section-heading .section-desc {
  color: #5B6670;
  font-size: 0.95rem;
  max-width: 680px;
}

.track-list {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  position: relative;
}

.track-list::before {
  content: "";
  position: absolute;
  top: 24px;
  left: 40px;
  right: 40px;
  height: 2px;
  background-color: #D8D2C5;
  z-index: 0;
}

.track-item {
  position: relative;
  z-index: 1;
  background-color: #F5F1E8;
  padding: 0 8px;
  text-align: center;
}

.track-node {
  display: block;
  width: 48px;
  height: 48px;
  margin: 0 auto 12px;
  background-color: #FFFFFF;
  border: 2px solid #B42318;
  border-radius: 50%;
  position: relative;
  z-index: 2;
}

.track-node::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 6px;
  height: 6px;
  background-color: #B42318;
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.track-item h3 {
  font-size: 1rem;
  margin-bottom: 4px;
  font-family: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-weight: 600;
}

.track-item p {
  font-size: 0.8rem;
  color: #5B6670;
  margin-bottom: 6px;
  line-height: 1.5;
}

.track-output {
  display: inline-block;
  font-size: 0.75rem;
  color: #B42318;
  background-color: #EFEAE0;
  padding: 2px 8px;
  border-radius: 3px;
  line-height: 1.6;
}

/* ==========================================================================
   Components / 首页服务矩阵
   ========================================================================== */

.service-matrix-section {
  padding: 56px 0;
  border-bottom: 1px solid #D8D2C5;
}

.table-wrapper {
  max-width: 1200px;
  margin: 0 auto 24px;
  padding: 0 24px;
  overflow-x: auto;
}

.service-table {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
}

.service-table th,
.service-table td {
  padding: 16px;
}

.service-table th {
  font-size: 0.875rem;
  letter-spacing: 0.02em;
}

.service-table td {
  font-size: 0.875rem;
  line-height: 1.7;
}

.boundary-tip {
  max-width: 1200px;
  margin: 24px auto 0;
  padding: 16px 24px;
}

/* ==========================================================================
   Components / 首页主推荐课题
   ========================================================================== */

.featured-topic-section {
  padding: 56px 0;
  border-bottom: 1px solid #D8D2C5;
}

.topic-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 440px;
  gap: 48px;
  align-items: start;
}

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

.topic-copy h2 {
  font-size: 1.5rem;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}

.topic-copy h2::after {
  content: "";
  display: block;
  width: 44px;
  height: 2px;
  background-color: #B42318;
  margin-top: 8px;
}

.topic-summary {
  color: #5B6670;
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.topic-points {
  margin-bottom: 20px;
}

.topic-points li {
  padding: 8px 0 8px 20px;
  position: relative;
  font-size: 0.9rem;
  border-bottom: 1px dashed #D8D2C5;
}

.topic-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 8px;
  height: 8px;
  border: 1px solid #B42318;
  border-radius: 50%;
}

.topic-quote {
  margin: 24px 0;
}

.topic-copy .btn-text {
  margin-top: 8px;
}

.topic-figure {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 16px;
}

.topic-figure img {
  width: 100%;
  height: auto;
  border-radius: 4px;
}

.topic-figure figcaption {
  font-size: 0.8rem;
  color: #5B6670;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #D8D2C5;
  line-height: 1.6;
}

/* ==========================================================================
   Components / 首页次推荐入口
   ========================================================================== */

.method-resource-section {
  padding: 56px 0;
  border-bottom: 1px solid #D8D2C5;
}

.entry-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.entry-card {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 32px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.entry-card:hover {
  border-color: #B42318;
  box-shadow: 0 2px 8px rgba(31, 35, 40, 0.06);
}

.entry-card h3 {
  font-size: 1.125rem;
  margin-bottom: 12px;
}

.entry-card p {
  color: #5B6670;
  font-size: 0.9rem;
  margin-bottom: 16px;
  line-height: 1.8;
}

.entry-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  min-height: 44px;
  padding: 8px 0;
}

.entry-link::after {
  content: "→";
  transition: transform 0.2s ease;
}

.entry-link:hover::after {
  transform: translateX(4px);
}

/* ==========================================================================
   Components / 首页最新动态
   ========================================================================== */

.updates-section {
  padding: 56px 0;
  border-bottom: 1px solid #D8D2C5;
}

.updates-list {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.update-item {
  display: flex;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px dashed #D8D2C5;
  align-items: baseline;
}

.update-item:last-child {
  border-bottom: none;
}

.update-category {
  flex-shrink: 0;
  display: inline-block;
  background-color: #EFEAE0;
  color: #B42318;
  font-size: 0.75rem;
  padding: 2px 10px;
  border-radius: 3px;
  font-weight: 600;
}

.update-item p {
  font-size: 0.9rem;
  color: #1F2328;
  margin-bottom: 0;
  line-height: 1.7;
}

/* ==========================================================================
   Components / 首页 FAQ 预览
   ========================================================================== */

.faq-preview-section {
  padding: 56px 0;
  border-bottom: 1px solid #D8D2C5;
}

.faq-preview-list {
  max-width: 1200px;
  margin: 0 auto 16px;
  padding: 0 24px;
}

.faq-item {
  border-bottom: 1px solid #D8D2C5;
}

.faq-item summary {
  cursor: pointer;
  padding: 16px 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: #1F2328;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 44px;
  list-style: none;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 1.25rem;
  color: #B42318;
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

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

.faq-item p {
  padding: 0 0 16px;
  color: #5B6670;
  font-size: 0.9rem;
  line-height: 1.8;
  max-width: 780px;
}

.faq-preview-section > .btn-text {
  margin-left: 24px;
  max-width: 1200px;
  display: inline-flex;
}

/* ==========================================================================
   Components / 首页合作引导
   ========================================================================== */

.cooperation-guide {
  padding: 56px 0;
}

.guide-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 32px 40px;
}

.guide-content h2 {
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.guide-content p {
  color: #5B6670;
  font-size: 0.9rem;
  margin-bottom: 0;
  max-width: 560px;
}

.guide-content .btn-primary {
  flex-shrink: 0;
}

/* ==========================================================================
   Components / 首页相关链接
   ========================================================================== */

.related-links {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 16px;
  border-top: 1px solid #D8D2C5;
}

.related-links-label {
  font-size: 0.8rem;
  color: #5B6670;
  margin-right: 8px;
}

.related-links-item {
  font-size: 0.85rem;
  color: #B42318;
  padding: 4px 0;
}

.related-links-item:hover {
  color: #8A1B12;
}

/* ==========================================================================
   Pages / 研究课题页
   ========================================================================== */

.section-intro {
  margin-bottom: 48px;
}

.intro-grid {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 40px;
  align-items: start;
}

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

.intro-copy p {
  color: #3A4148;
  font-size: 0.95rem;
  line-height: 1.9;
}

.intro-copy p:first-of-type {
  margin-top: 16px;
}

.intro-figure {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 16px;
}

.intro-figure img {
  width: 100%;
  height: auto;
  border-radius: 4px;
}

.intro-figure figcaption {
  font-size: 0.8rem;
  color: #5B6670;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #D8D2C5;
  line-height: 1.6;
}

.table-wrap {
  overflow-x: auto;
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
}

.data-table th,
.data-table td {
  padding: 14px 16px;
}

.data-table td {
  font-size: 0.875rem;
  line-height: 1.7;
}

.data-table a {
  font-size: 0.85rem;
  font-weight: 600;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.topic-card {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 24px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.topic-card:hover {
  border-color: #B42318;
  box-shadow: 0 2px 8px rgba(31, 35, 40, 0.06);
}

.card-title {
  font-size: 1rem;
  margin-bottom: 8px;
}

.card-question {
  font-size: 0.875rem;
  color: #5B6670;
  margin-bottom: 8px;
  line-height: 1.7;
}

.card-status {
  display: inline-block;
  font-size: 0.75rem;
  color: #B42318;
  background-color: #EFEAE0;
  padding: 2px 10px;
  border-radius: 3px;
  margin-bottom: 8px;
  font-weight: 600;
}

.card-note {
  font-size: 0.8rem;
  color: #5B6670;
  margin-bottom: 12px;
  line-height: 1.7;
}

.card-link {
  font-size: 0.85rem;
  font-weight: 600;
}

.featured-grid {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 40px;
  align-items: start;
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 32px;
}

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

.featured-copy p {
  color: #3A4148;
  font-size: 0.925rem;
  line-height: 1.9;
}

.block-quote {
  margin: 20px 0;
}

.featured-copy > p:last-of-type {
  margin-top: 16px;
}

.featured-copy a {
  font-weight: 600;
  font-size: 0.9rem;
}

.featured-aside {
  background-color: #F5F1E8;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 20px;
}

.aside-title {
  font-size: 0.875rem;
  margin-bottom: 12px;
  font-family: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-weight: 600;
}

.keyword-list li {
  padding: 6px 0;
  border-bottom: 1px dashed #D8D2C5;
  font-size: 0.85rem;
  color: #3A4148;
}

.keyword-list li:last-child {
  border-bottom: none;
}

.banner-card {
  background-color: #1F2328;
  color: #FFFFFF;
  border-radius: 6px;
  padding: 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.banner-title {
  color: #FFFFFF;
  font-size: 1.25rem;
  margin-bottom: 8px;
}

.banner-text {
  color: #9AA4AE;
  font-size: 0.9rem;
  margin-bottom: 0;
  max-width: 560px;
}

.banner-card .btn-primary {
  flex-shrink: 0;
}

.resources-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.resource-item {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 24px;
}

.resource-title {
  font-size: 0.95rem;
  margin-bottom: 8px;
}

.resource-desc {
  font-size: 0.85rem;
  color: #5B6670;
  line-height: 1.7;
  margin-bottom: 0;
}

.resources-more {
  margin-top: 20px;
  font-size: 0.9rem;
}

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

.related-list li a {
  display: block;
  padding: 12px 16px;
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  transition: border-color 0.2s ease;
}

.related-list li a:hover {
  border-color: #B42318;
}

/* ==========================================================================
   Pages / 核查方法页
   ========================================================================== */

.method-section {
  max-width: 1200px;
  margin: 0 auto 48px;
  padding: 0 24px;
}

.method-section .section-title {
  margin-bottom: 20px;
}

.method-section > p {
  color: #3A4148;
  font-size: 0.95rem;
  line-height: 1.9;
  max-width: 800px;
}

.question-list {
  margin: 16px 0;
  counter-reset: question;
}

.question-list li {
  counter-increment: question;
  padding: 10px 0 10px 36px;
  position: relative;
  font-size: 0.925rem;
  color: #3A4148;
  border-bottom: 1px dashed #D8D2C5;
  max-width: 800px;
}

.question-list li::before {
  content: counter(question, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 10px;
  font-size: 0.8rem;
  color: #B42318;
  font-weight: 600;
}

.method-steps {
  counter-reset: step;
  margin: 20px 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.method-steps li {
  counter-increment: step;
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 20px 16px;
  position: relative;
  font-size: 0.85rem;
  color: #3A4148;
  line-height: 1.7;
}

.method-steps li::before {
  content: counter(step, decimal-leading-zero);
  display: block;
  font-size: 1.5rem;
  color: #B42318;
  font-weight: 700;
  margin-bottom: 8px;
  font-family: Georgia, 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', serif;
}

.method-figure {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 16px;
  margin: 24px 0;
}

.method-figure img {
  width: 100%;
  height: auto;
  border-radius: 4px;
}

.method-figure figcaption {
  font-size: 0.8rem;
  color: #5B6670;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #D8D2C5;
  line-height: 1.6;
}

.progress-list {
  margin: 16px 0;
}

.progress-list li {
  padding: 8px 0 8px 20px;
  position: relative;
  font-size: 0.9rem;
  color: #3A4148;
  border-bottom: 1px dashed #D8D2C5;
  max-width: 800px;
}

.progress-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 6px;
  height: 6px;
  background-color: #B42318;
  border-radius: 50%;
}

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

.output-list li {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 16px 20px;
  font-size: 0.875rem;
  color: #3A4148;
  line-height: 1.7;
}

.method-related {
  max-width: 1200px;
  margin: 0 auto 48px;
  padding: 0 24px;
}

.related-title {
  font-size: 1.125rem;
  margin-bottom: 16px;
}

.related-links li {
  display: inline-block;
  margin-right: 12px;
  margin-bottom: 8px;
}

.related-links li a {
  display: inline-block;
  padding: 8px 16px;
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
}

.related-links li a:hover {
  border-color: #B42318;
}

/* ==========================================================================
   Pages / 资料目录页
   ========================================================================== */

.section-source-matrix .table-wrap {
  margin-bottom: 24px;
}

.source-table th,
.source-table td {
  padding: 14px 16px;
}

.source-table td {
  font-size: 0.875rem;
  line-height: 1.7;
}

.source-figure {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 16px;
  margin: 24px 0;
}

.source-figure img {
  width: 100%;
  height: auto;
  border-radius: 4px;
}

.source-figure figcaption {
  font-size: 0.8rem;
  color: #5B6670;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #D8D2C5;
  line-height: 1.6;
}

.boundary-quote {
  max-width: 800px;
}

.section-boundary > p {
  color: #3A4148;
  font-size: 0.925rem;
  line-height: 1.9;
  max-width: 800px;
}

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

.checklist-item {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 20px 24px;
}

.checklist-item h3 {
  font-size: 0.925rem;
  margin-bottom: 8px;
  font-family: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-weight: 600;
}

.checklist-item p {
  font-size: 0.85rem;
  color: #5B6670;
  line-height: 1.7;
  margin-bottom: 0;
}

.section-related-links .related-links {
  padding: 0;
  border-top: none;
  justify-content: flex-start;
}

/* ==========================================================================
   Pages / 合作流程页
   ========================================================================== */

.process-details {
  max-width: 1200px;
  margin: 0 auto 56px;
  padding: 0 24px;
}

.process-node {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 24px 32px;
  margin-bottom: 20px;
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 32px;
}

.node-meta {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.node-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 2px solid #B42318;
  border-radius: 50%;
  color: #B42318;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.node-name {
  font-size: 1rem;
  font-family: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-weight: 600;
  padding-top: 8px;
}

.node-content {
  min-width: 0;
}

.node-action {
  font-size: 0.9rem;
  color: #3A4148;
  margin-bottom: 16px;
  line-height: 1.8;
}

.node-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.node-detail {
  background-color: #F5F1E8;
  border-radius: 4px;
  padding: 16px;
}

.node-detail h4 {
  font-size: 0.8rem;
  color: #B42318;
  margin-bottom: 8px;
  font-family: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-weight: 600;
}

.node-detail p {
  font-size: 0.85rem;
  color: #3A4148;
  line-height: 1.7;
  margin-bottom: 0;
}

.process-timeline {
  max-width: 1200px;
  margin: 0 auto 56px;
  padding: 0 24px;
}

.timeline-track {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-bottom: 32px;
  position: relative;
  padding-top: 24px;
}

.timeline-track::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 24px;
  right: 24px;
  height: 2px;
  background-color: #D8D2C5;
}

.timeline-item {
  text-align: center;
  position: relative;
}

.timeline-dot {
  display: block;
  width: 16px;
  height: 16px;
  margin: 0 auto 12px;
  background-color: #B42318;
  border: 3px solid #F5F1E8;
  border-radius: 50%;
  position: relative;
  z-index: 1;
  box-shadow: 0 0 0 2px #B42318;
}

.timeline-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: #1F2328;
  margin-bottom: 4px;
}

.timeline-output {
  font-size: 0.75rem;
  color: #5B6670;
  line-height: 1.5;
}

.process-figure {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 16px;
}

.process-figure img {
  width: 100%;
  height: auto;
  border-radius: 4px;
}

.process-figure figcaption {
  font-size: 0.8rem;
  color: #5B6670;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #D8D2C5;
  line-height: 1.6;
}

.material-prep {
  max-width: 1200px;
  margin: 0 auto 56px;
  padding: 0 24px;
}

.material-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.material-list li {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 20px;
  font-size: 0.85rem;
  color: #3A4148;
  line-height: 1.7;
  position: relative;
  padding-left: 44px;
}

.material-list li::before {
  content: "✓";
  position: absolute;
  left: 16px;
  top: 20px;
  color: #B42318;
  font-weight: 700;
}

.file-confirm-tool {
  max-width: 1200px;
  margin: 0 auto 56px;
  padding: 0 24px;
}

.file-tool-box {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 32px;
  max-width: 640px;
}

.file-select-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  background-color: #EFEAE0;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  color: #1F2328;
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.file-select-label:hover {
  border-color: #B42318;
  background-color: #FFFFFF;
}

.file-input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.file-info-preview {
  margin-top: 20px;
  border-top: 1px dashed #D8D2C5;
  padding-top: 20px;
}

.file-preview-empty {
  font-size: 0.85rem;
  color: #5B6670;
  font-style: italic;
}

.file-tool-note {
  font-size: 0.8rem;
  color: #5B6670;
  margin-top: 16px;
  line-height: 1.7;
}

.boundary-note {
  max-width: 1200px;
  margin: 0 auto 56px;
  padding: 0 24px;
}

.boundary-note > p {
  color: #3A4148;
  font-size: 0.9rem;
  line-height: 1.9;
  max-width: 800px;
}

.boundary-note > p a {
  font-weight: 600;
  margin-right: 12px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-card {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 24px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.related-card:hover {
  border-color: #B42318;
  box-shadow: 0 2px 8px rgba(31, 35, 40, 0.06);
}

.related-card h3 {
  font-size: 0.95rem;
  margin-bottom: 8px;
}

.related-card p {
  font-size: 0.85rem;
  color: #5B6670;
  line-height: 1.7;
  margin-bottom: 0;
}

/* ==========================================================================
   Pages / 常见问题页
   ========================================================================== */

.faq-intro {
  max-width: 1200px;
  margin: 0 auto 48px;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 40px;
  align-items: start;
}

.intro-copy p {
  color: #3A4148;
  font-size: 0.925rem;
  line-height: 1.9;
}

.intro-media {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 16px;
}

.intro-media img {
  width: 100%;
  height: auto;
  border-radius: 4px;
}

.intro-media figcaption {
  font-size: 0.8rem;
  color: #5B6670;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #D8D2C5;
  line-height: 1.6;
}

.faq-group {
  max-width: 1200px;
  margin: 0 auto 48px;
  padding: 0 24px;
}

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

.faq-answer {
  padding-bottom: 16px;
}

.faq-answer p {
  color: #5B6670;
  font-size: 0.9rem;
  line-height: 1.8;
  max-width: 780px;
}

.faq-help {
  max-width: 1200px;
  margin: 0 auto 48px;
  padding: 0 24px;
}

.faq-help > p {
  color: #5B6670;
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.help-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.help-links li a {
  display: inline-block;
  padding: 10px 20px;
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  min-height: 44px;
  line-height: 1.6;
}

.help-links li a:hover {
  border-color: #B42318;
}

/* ==========================================================================
   Pages / 关于我们页
   ========================================================================== */

.about-lead-figure {
  max-width: 1200px;
  margin: 0 auto 48px;
  padding: 0 24px;
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 16px;
}

.about-lead-image {
  width: 100%;
  height: auto;
  border-radius: 4px;
}

.about-lead-figure figcaption {
  font-size: 0.8rem;
  color: #5B6670;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid #D8D2C5;
  line-height: 1.6;
}

.about-section {
  max-width: 1200px;
  margin: 0 auto 48px;
  padding: 0 24px;
}

.about-section h2 {
  font-size: 1.375rem;
  margin-bottom: 16px;
  position: relative;
  padding-bottom: 10px;
}

.about-section h2::after {
  content: "";
  display: block;
  width: 44px;
  height: 2px;
  background-color: #B42318;
  margin-top: 8px;
}

.about-section > p {
  color: #3A4148;
  font-size: 0.925rem;
  line-height: 1.9;
  max-width: 800px;
}

.about-work-list {
  margin-top: 16px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.about-work-list li {
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  padding: 20px 24px;
  font-size: 0.875rem;
  color: #3A4148;
  line-height: 1.8;
  position: relative;
  padding-left: 48px;
}

.about-work-list li::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 24px;
  width: 8px;
  height: 8px;
  background-color: #B42318;
  border-radius: 50%;
}

.about-principles-list {
  margin-top: 16px;
}

.about-principles-list li {
  padding: 10px 0 10px 24px;
  position: relative;
  font-size: 0.9rem;
  color: #3A4148;
  border-bottom: 1px dashed #D8D2C5;
  max-width: 800px;
}

.about-principles-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 6px;
  height: 6px;
  background-color: #B42318;
  border-radius: 50%;
}

.about-quote {
  max-width: 800px;
}

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

.about-sitemap-list li a {
  display: block;
  padding: 12px 16px;
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  transition: border-color 0.2s ease;
}

.about-sitemap-list li a:hover {
  border-color: #B42318;
}

.about-related-links {
  max-width: 1200px;
  margin: 0 auto 48px;
  padding: 0 24px;
}

.about-related-links h2 {
  font-size: 1.125rem;
  margin-bottom: 16px;
}

.about-related-links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.about-related-links li a {
  display: inline-block;
  padding: 8px 16px;
  background-color: #FFFFFF;
  border: 1px solid #D8D2C5;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
}

.about-related-links li a:hover {
  border-color: #B42318;
}

/* ==========================================================================
   Pages / 404 页
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  flex: 1;
}

.error-section {
  text-align: center;
  max-width: 600px;
  width: 100%;
}

.error-code {
  font-family: Georgia, 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', serif;
  font-size: 6rem;
  font-weight: 700;
  color: #B42318;
  line-height: 1;
  margin-bottom: 16px;
}

.error-section h1 {
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.error-desc {
  color: #5B6670;
  font-size: 0.95rem;
  margin-bottom: 32px;
}

.error-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.error-help {
  font-size: 0.85rem;
  color: #5B6670;
}

/* ==========================================================================
   Responsive / 响应式
   ========================================================================== */

@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr 380px;
    gap: 32px;
  }

  .topic-layout {
    grid-template-columns: 1fr 360px;
    gap: 32px;
  }

  .intro-grid {
    grid-template-columns: 1fr 320px;
    gap: 32px;
  }

  .faq-intro {
    grid-template-columns: 1fr 320px;
    gap: 32px;
  }

  .featured-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .featured-aside {
    margin-top: 0;
  }

  .method-steps {
    grid-template-columns: repeat(3, 1fr);
  }

  .method-steps li:nth-child(4),
  .method-steps li:nth-child(5) {
    grid-column: span 1;
  }

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

  .process-node {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background-color: #F5F1E8;
    border-bottom: 1px solid #D8D2C5;
    box-shadow: 0 4px 12px rgba(31, 35, 40, 0.06);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 24px 20px;
    gap: 0;
  }

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

  .nav-item {
    border-bottom: 1px solid #EFEAE0;
  }

  .nav-item:last-child {
    border-bottom: none;
  }

  .nav-link {
    display: block;
    padding: 14px 8px;
    font-size: 0.95rem;
  }

  .nav-item.is-current .nav-link::after,
  .nav-link.is-current::after {
    display: none;
  }

  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    border-left: 2px solid #D8D2C5;
    border-radius: 0;
    margin: 0 0 8px 16px;
    padding: 0;
    background-color: transparent;
    min-width: 0;
  }

  .dropdown-menu li a {
    padding: 10px 8px;
    font-size: 0.875rem;
  }

  .hero-layout {
    grid-template-columns: 1fr;
    padding: 48px 24px 40px;
  }

  .hero-copy {
    order: 1;
  }

  .hero-figure {
    order: 2;
  }

  .track-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .track-list::before {
    display: none;
  }

  .track-item {
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 12px;
    text-align: left;
    align-items: center;
    padding: 12px;
    background-color: #FFFFFF;
    border: 1px solid #D8D2C5;
    border-radius: 6px;
  }

  .track-node {
    margin: 0;
    grid-row: span 2;
  }

  .track-item h3 {
    margin-bottom: 0;
  }

  .track-item p {
    grid-column: 2;
    margin-bottom: 0;
  }

  .track-output {
    grid-column: 2;
    justify-self: start;
  }

  .topic-layout {
    grid-template-columns: 1fr;
  }

  .entry-grid {
    grid-template-columns: 1fr;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

  .resources-grid {
    grid-template-columns: 1fr;
  }

  .related-list {
    grid-template-columns: 1fr;
  }

  .intro-grid {
    grid-template-columns: 1fr;
  }

  .intro-figure {
    order: 2;
  }

  .faq-intro {
    grid-template-columns: 1fr;
  }

  .method-steps {
    grid-template-columns: 1fr 1fr;
  }

  .output-list {
    grid-template-columns: 1fr;
  }

  .checklist {
    grid-template-columns: 1fr;
  }

  .node-detail-grid {
    grid-template-columns: 1fr;
  }

  .timeline-track {
    grid-template-columns: 1fr;
    gap: 12px;
    padding-top: 0;
  }

  .timeline-track::before {
    display: none;
  }

  .timeline-item {
    display: grid;
    grid-template-columns: 16px 1fr;
    gap: 12px;
    text-align: left;
    align-items: center;
    background-color: #FFFFFF;
    border: 1px solid #D8D2C5;
    border-radius: 6px;
    padding: 12px 16px;
  }

  .timeline-dot {
    margin: 0;
  }

  .related-grid {
    grid-template-columns: 1fr;
  }

  .about-work-list {
    grid-template-columns: 1fr;
  }

  .about-sitemap-list {
    grid-template-columns: 1fr;
  }

  .footer-links {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .guide-content {
    flex-direction: column;
    align-items: flex-start;
    padding: 24px;
  }

  .banner-card {
    flex-direction: column;
    align-items: flex-start;
  }

  .material-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .header-shell {
    padding: 0 16px;
    height: 60px;
  }

  .brand-name {
    font-size: 1.25rem;
  }

  .brand-tag {
    display: none;
  }

  .site-nav {
    top: 60px;
  }

  .nav-list {
    padding: 12px 16px 20px;
  }

  .page-header {
    padding: 28px 16px 20px;
    margin-bottom: 32px;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .page-description {
    font-size: 0.9rem;
  }

  .breadcrumb {
    padding: 16px 16px 0;
  }

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

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

  .hero-layout {
    padding: 32px 16px 32px;
  }

  .hero-copy h1 {
    font-size: 1.625rem;
  }

  .hero-lead {
    font-size: 1rem;
  }

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

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

  .hero-figure {
    padding: 12px;
  }

  .track-list {
    padding: 0 16px;
  }

  .table-wrapper {
    padding: 0 16px;
  }

  .service-table th,
  .service-table td {
    padding: 12px;
    font-size: 0.8rem;
  }

  .topic-layout {
    padding: 0 16px;
  }

  .topic-copy h2 {
    font-size: 1.25rem;
  }

  .entry-grid {
    padding: 0 16px;
  }

  .entry-card {
    padding: 20px;
  }

  .updates-list {
    padding: 0 16px;
  }

  .faq-preview-list {
    padding: 0 16px;
  }

  .faq-preview-section > .btn-text {
    margin-left: 16px;
  }

  .guide-content {
    margin: 0 16px;
    padding: 20px;
  }

  .related-links {
    padding: 16px;
    gap: 4px 12px;
  }

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

  .method-section .section-title {
    font-size: 1.25rem;
  }

  .method-steps {
    grid-template-columns: 1fr;
  }

  .method-related {
    padding: 0 16px;
  }

  .process-details {
    padding: 0 16px;
  }

  .process-node {
    padding: 20px;
  }

  .process-timeline {
    padding: 0 16px;
  }

  .material-prep {
    padding: 0 16px;
  }

  .file-confirm-tool {
    padding: 0 16px;
  }

  .file-tool-box {
    padding: 20px;
  }

  .boundary-note {
    padding: 0 16px;
  }

  .faq-group {
    padding: 0 16px;
  }

  .faq-intro {
    padding: 0 16px;
  }

  .faq-help {
    padding: 0 16px;
  }

  .help-links {
    flex-direction: column;
  }

  .help-links li a {
    width: 100%;
    text-align: center;
  }

  .about-lead-figure {
    padding: 12px;
    margin-bottom: 32px;
  }

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

  .about-related-links {
    padding: 0 16px;
  }

  .error-main {
    padding: 48px 16px;
  }

  .error-code {
    font-size: 4rem;
  }

  .error-actions {
    flex-direction: column;
  }

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

  .footer-shell {
    padding: 32px 16px 20px;
  }

  .footer-links {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 4px;
  }
}

/* ==========================================================================
   动效增强（不影响初始可见性）
   ========================================================================== */

@media (prefers-reduced-motion: no-preference) {
  .entry-card,
  .topic-card,
  .resource-item,
  .checklist-item,
  .related-card,
  .process-node,
  .timeline-item,
  .material-list li,
  .about-work-list li,
  .about-sitemap-list li a {
    transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
  }

  .entry-card:hover,
  .topic-card:hover,
  .related-card:hover {
    transform: translateY(-2px);
  }
}