/* ============================================================
   base — 全局基础样式
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  line-height: 1.7;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: #2b2f36;
  background-color: #f7f9fc;
}

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

a {
  color: #16324f;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #e8743a;
}

p {
  margin: 0 0 1em;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.5em;
  font-weight: 700;
  line-height: 1.3;
  color: #16324f;
}

h1 {
  font-size: 30px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

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

figure {
  margin: 0;
}

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

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

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

/* ============================================================
   layout — 全站布局骨架
   ============================================================ */
.site-header {
  background-color: #ffffff;
  border-bottom: 1px solid #e0e6ed;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1130px;
  margin: 0 auto;
  padding: 0 24px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: #16324f;
  letter-spacing: 0;
}

.brand-tagline {
  font-size: 13px;
  color: #6b7684;
}

.main-nav {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

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

.nav-link {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: #2b2f36;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-link:hover {
  color: #e8743a;
  background-color: #f7f9fc;
}

.nav-link.is-current {
  color: #e8743a;
  background-color: #f7f9fc;
  font-weight: 600;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: 6px;
}

.toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: #16324f;
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-main {
  min-height: 60vh;
}

.inner-main {
  max-width: 1130px;
  margin: 0 auto;
  padding: 0 24px;
}

.site-footer {
  background-color: #16324f;
  color: #c8d2dc;
  margin-top: 64px;
}

.footer-inner {
  max-width: 1130px;
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 40px;
}

.footer-brand-name {
  font-size: 20px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
}

.footer-brand-desc {
  font-size: 14px;
  line-height: 1.7;
  color: #a8b6c2;
  margin: 0;
}

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

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

.footer-nav-list a {
  font-size: 14px;
  color: #a8b6c2;
  transition: color 0.2s ease;
}

.footer-nav-list a:hover {
  color: #ffffff;
}

.footer-feedback-text {
  font-size: 14px;
  line-height: 1.7;
  color: #a8b6c2;
  margin: 0;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 16px 24px;
  text-align: center;
}

.footer-bottom p {
  margin: 0;
  font-size: 13px;
  color: #8a9aa8;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  padding: 24px 0 0;
  color: #6b7684;
}

.breadcrumb a {
  color: #6b7684;
}

.breadcrumb a:hover {
  color: #e8743a;
}

.breadcrumb-sep {
  color: #a8b6c2;
}

.breadcrumb-current {
  color: #2b2f36;
  font-weight: 500;
}

/* 页面标题区 */
.page-header {
  padding: 16px 0 8px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: #16324f;
  margin: 0;
}

.page-title-block {
  padding: 8px 0 24px;
}

.page-title-block p,
.page-title p {
  font-size: 16px;
  color: #4a5560;
  max-width: 860px;
  margin: 0;
}

/* ============================================================
   components — 通用组件
   ============================================================ */
/* 区块标题 */
.section-heading {
  margin-bottom: 32px;
}

.section-title {
  font-size: 24px;
  font-weight: 700;
  color: #16324f;
  margin-bottom: 8px;
}

.section-desc {
  font-size: 15px;
  color: #4a5560;
  margin: 0;
}

/* 文本链接 */
.text-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  color: #e8743a;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.text-link:hover {
  color: #d4622a;
  border-bottom-color: #d4622a;
}

.center-link {
  display: inline-block;
  margin-top: 24px;
}

/* 按钮 */
.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
  background-color: #e8743a;
  color: #ffffff;
  border: 1px solid #e8743a;
}

.btn-primary:hover {
  background-color: #d4622a;
  border-color: #d4622a;
  color: #ffffff;
}

.btn-secondary {
  background-color: #ffffff;
  color: #16324f;
  border: 1px solid #16324f;
}

.btn-secondary:hover {
  background-color: #16324f;
  color: #ffffff;
  border-color: #16324f;
}

/* 服务卡片 */
.service-card {
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  padding: 24px;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.service-card:hover {
  border-color: #c0ccd8;
  box-shadow: 0 4px 16px rgba(22, 50, 79, 0.08);
}

.service-card img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: 6px;
  margin-bottom: 16px;
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.card-text {
  font-size: 14px;
  color: #4a5560;
  margin-bottom: 12px;
  line-height: 1.6;
}

.card-link {
  font-size: 14px;
  font-weight: 600;
  color: #e8743a;
}

.card-link:hover {
  color: #d4622a;
}

/* FAQ 折叠 */
.faq-item {
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  margin-bottom: 12px;
  padding: 0;
  overflow: hidden;
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  font-size: 15px;
  font-weight: 600;
  color: #16324f;
  cursor: pointer;
  list-style: none;
  transition: background-color 0.2s ease;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: #e8743a;
  flex-shrink: 0;
  margin-left: 16px;
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item summary:hover {
  background-color: #f7f9fc;
}

.faq-item p {
  padding: 0 20px 18px;
  font-size: 14px;
  color: #4a5560;
  margin: 0;
  line-height: 1.7;
}

.faq-answer {
  padding: 0 20px 18px;
  font-size: 14px;
  color: #4a5560;
  line-height: 1.7;
}

/* 时间线（首页预览） */
.timeline-preview {
  position: relative;
  padding-left: 28px;
}

.timeline-preview::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background-color: #e0e6ed;
}

.timeline-item {
  position: relative;
  padding-bottom: 24px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-dot {
  position: absolute;
  left: -24px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: #e8743a;
  border: 2px solid #ffffff;
  box-shadow: 0 0 0 2px #e8743a;
}

.timeline-content {
  padding-left: 8px;
}

.timeline-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 4px;
}

.timeline-text {
  font-size: 14px;
  color: #4a5560;
  margin: 0;
}

/* 核对清单 */
.checklist {
  list-style: none;
  padding: 0;
}

.checklist li {
  padding: 10px 0;
  border-bottom: 1px solid #e0e6ed;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.checklist li::before {
  content: "□";
  font-size: 16px;
  color: #e8743a;
  flex-shrink: 0;
  line-height: 1.6;
}

.checklist li h3 {
  font-size: 15px;
  margin: 0 0 4px;
}

.checklist li p {
  font-size: 14px;
  color: #4a5560;
  margin: 0;
  line-height: 1.6;
}

.checklist-note {
  font-size: 14px;
  color: #4a5560;
  background-color: #f0f4f8;
  border-left: 3px solid #e8743a;
  padding: 12px 16px;
  border-radius: 0 6px 6px 0;
  margin-top: 16px;
}

/* 相关链接 */
.related-links {
  max-width: 1130px;
  margin: 48px auto 0;
  padding: 24px;
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: #16324f;
  margin-right: 8px;
}

.related-links-item {
  display: inline-block;
  padding: 8px 16px;
  font-size: 14px;
  color: #16324f;
  background-color: #f7f9fc;
  border-radius: 6px;
  border: 1px solid #e0e6ed;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.related-links-item:hover {
  border-color: #e8743a;
  color: #e8743a;
}

.related-nav-list li {
  margin-bottom: 8px;
}

.related-nav-list a {
  font-size: 15px;
  color: #16324f;
  padding: 6px 0;
  display: inline-block;
}

.related-nav-list a:hover {
  color: #e8743a;
}

.related-title {
  font-weight: 600;
  color: #16324f;
  margin-bottom: 12px;
}

/* 侧栏 aside 通用 */
.aside-inner {
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  padding: 24px;
}

.aside-inner img {
  width: 100%;
  height: 120px;
  object-fit: cover;
  border-radius: 6px;
  margin-bottom: 16px;
}

.aside-inner h2,
.aside-title {
  font-size: 18px;
  font-weight: 600;
  color: #16324f;
  margin-bottom: 12px;
}

.aside-inner p {
  font-size: 14px;
  color: #4a5560;
  line-height: 1.7;
}

.aside-inner ul {
  list-style: none;
  padding: 0;
}

.aside-inner ul li {
  padding: 6px 0;
  font-size: 14px;
  color: #4a5560;
  border-bottom: 1px solid #f0f4f8;
}

.aside-inner ul li:last-child {
  border-bottom: none;
}

/* ============================================================
   pages — 首页
   ============================================================ */
.site-home .site-main {
  max-width: 1130px;
  margin: 0 auto;
  padding: 0 24px;
}

/* hero */
.hero-section {
  padding: 56px 0 48px;
}

.hero-content {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-text {
  padding-right: 8px;
}

.hero-title {
  font-size: 34px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
  color: #16324f;
}

.hero-lead {
  font-size: 16px;
  color: #4a5560;
  line-height: 1.8;
  margin-bottom: 28px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-figure {
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  padding: 16px;
  box-shadow: 0 4px 20px rgba(22, 50, 79, 0.06);
}

.hero-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: 6px;
}

.hero-figure figcaption {
  font-size: 13px;
  color: #6b7684;
  padding: 12px 4px 4px;
  text-align: center;
}

.source-note {
  font-size: 13px;
  color: #6b7684;
  text-align: center;
  margin: 24px 0 0;
  padding-top: 16px;
  border-top: 1px solid #e0e6ed;
}

/* 服务方向索引 */
.service-index-section {
  padding: 48px 0;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

/* 热点报告预览 */
.insights-preview-section {
  padding: 48px 0;
}

.insights-preview-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 40px;
  align-items: start;
}

.insights-intro {
  padding-top: 8px;
}

.insights-intro .section-title {
  margin-bottom: 12px;
}

.insights-intro .section-desc {
  margin-bottom: 20px;
}

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

.insight-item {
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  padding: 20px;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.insight-item:hover {
  border-color: #c0ccd8;
  box-shadow: 0 4px 16px rgba(22, 50, 79, 0.08);
}

.item-title {
  font-size: 16px;
  font-weight: 600;
  color: #16324f;
  margin-bottom: 8px;
  line-height: 1.4;
}

.item-meta {
  font-size: 13px;
  color: #6b7684;
  margin-bottom: 12px;
}

.item-link {
  font-size: 14px;
  font-weight: 600;
  color: #e8743a;
}

.item-link:hover {
  color: #d4622a;
}

/* 合作流程预览 */
.process-preview-section {
  padding: 48px 0;
}

/* 数据方法要点 */
.methods-overview-section {
  padding: 48px 0;
}

.methods-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.methods-col {
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  padding: 28px;
}

.methods-col .section-title {
  font-size: 20px;
  margin-bottom: 16px;
}

.method-list li {
  padding: 8px 0;
  font-size: 14px;
  color: #4a5560;
  border-bottom: 1px solid #f0f4f8;
  display: flex;
  gap: 10px;
}

.method-list li::before {
  content: "·";
  color: #e8743a;
  font-weight: 700;
  flex-shrink: 0;
}

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

.methods-col .text-link {
  margin-top: 16px;
}

/* FAQ 预览 */
.faq-preview-section {
  padding: 48px 0;
}

.faq-preview-list {
  max-width: 860px;
}

/* ============================================================
   pages — 内页通用布局
   ============================================================ */
.page-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 32px;
  align-items: start;
  padding: 24px 0 48px;
}

.page-layout .main-content {
  min-width: 0;
}

/* ============================================================
   pages — service.html
   ============================================================ */
.service-overview {
  padding: 24px 0 40px;
}

.service-overview > p {
  font-size: 15px;
  color: #4a5560;
  margin-bottom: 24px;
}

.service-card-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 32px;
}

.service-output {
  font-size: 13px;
  color: #6b7684;
  background-color: #f7f9fc;
  border-radius: 6px;
  padding: 10px 12px;
  margin: 0;
  line-height: 1.5;
}

.service-visual {
  margin-top: 16px;
}

.service-visual img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 8px;
}

.service-visual figcaption {
  font-size: 13px;
  color: #6b7684;
  padding: 10px 4px 0;
  text-align: center;
}

/* 比较表 */
.comparison-table-section {
  padding: 32px 0;
}

.comparison-table-section > p {
  font-size: 15px;
  color: #4a5560;
  margin-bottom: 20px;
}

.table-wrapper {
  overflow-x: auto;
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
}

.comparison-table {
  min-width: 640px;
}

.comparison-table th,
.comparison-table td {
  padding: 14px 16px;
  text-align: left;
  font-size: 14px;
  border-bottom: 1px solid #e0e6ed;
  vertical-align: top;
}

.comparison-table thead th {
  background-color: #f0f4f8;
  font-weight: 600;
  color: #16324f;
  white-space: nowrap;
}

.comparison-table tbody tr:last-child td {
  border-bottom: none;
}

.comparison-table tbody tr:hover td {
  background-color: #f7f9fc;
}

/* 选型清单 */
.selection-checklist {
  padding: 32px 0;
}

.selection-checklist > p {
  font-size: 15px;
  color: #4a5560;
  margin-bottom: 20px;
}

.selection-checklist .checklist li {
  padding: 14px 0;
}

/* 核对步骤 */
.verification-steps {
  padding: 32px 0;
}

.verification-steps > p {
  font-size: 15px;
  color: #4a5560;
  margin-bottom: 20px;
}

.steps-list {
  counter-reset: step-counter;
  list-style: none;
  padding: 0;
}

.steps-list li {
  counter-increment: step-counter;
  position: relative;
  padding: 16px 0 16px 56px;
  border-bottom: 1px solid #e0e6ed;
}

.steps-list li::before {
  content: counter(step-counter);
  position: absolute;
  left: 0;
  top: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: #16324f;
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.steps-list h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.steps-list p {
  font-size: 14px;
  color: #4a5560;
  margin: 0;
}

/* service aside */
.service-aside {
  min-width: 0;
}

.service-aside .aside-inner img {
  height: 100px;
}

.service-aside .aside-inner h2 {
  font-size: 16px;
}

.service-aside .aside-inner p {
  font-size: 13px;
}

/* ============================================================
   pages — insights.html
   ============================================================ */
.insights-layout {
  grid-template-columns: 1fr 300px;
}

.report-filters {
  padding: 16px 0;
}

.filter-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding: 0;
}

.filter-tabs li {
  margin: 0;
}

.filter-tabs a {
  display: inline-block;
  padding: 8px 18px;
  font-size: 14px;
  color: #16324f;
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 6px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.filter-tabs a:hover {
  border-color: #e8743a;
  color: #e8743a;
}

.report-list {
  padding: 24px 0;
}

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

.report-item {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 20px;
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 16px;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.report-item:hover {
  border-color: #c0ccd8;
  box-shadow: 0 4px 16px rgba(22, 50, 79, 0.08);
}

.report-thumb img {
  width: 140px;
  height: 100px;
  object-fit: cover;
  border-radius: 6px;
}

.report-title {
  font-size: 17px;
  font-weight: 600;
  color: #16324f;
  margin-bottom: 6px;
  line-height: 1.4;
}

.report-meta {
  font-size: 13px;
  color: #6b7684;
  margin-bottom: 8px;
}

.report-summary {
  font-size: 14px;
  color: #4a5560;
  line-height: 1.6;
  margin-bottom: 10px;
}

.report-link {
  font-size: 14px;
  font-weight: 600;
  color: #e8743a;
}

.report-link:hover {
  color: #d4622a;
}

.source-tag {
  display: inline-block;
  font-size: 12px;
  color: #16324f;
  background-color: #f0f4f8;
  border-radius: 4px;
  padding: 2px 8px;
  margin-right: 6px;
}

/* 报告结构 */
.report-structure {
  padding: 32px 0;
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  margin: 24px 0;
  padding: 28px;
}

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

.report-structure > p {
  font-size: 14px;
  color: #4a5560;
  margin-bottom: 16px;
}

.structure-list {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.structure-list li {
  background-color: #f7f9fc;
  border-radius: 6px;
  padding: 12px 16px;
  font-size: 14px;
  color: #4a5560;
  line-height: 1.5;
}

.structure-list strong {
  color: #16324f;
  display: block;
  font-size: 14px;
  margin-bottom: 2px;
}

.data-sources-note {
  padding: 24px 0;
}

.data-sources-note .section-title {
  margin-bottom: 16px;
}

.data-sources-note p {
  font-size: 14px;
  color: #4a5560;
  line-height: 1.7;
  margin-bottom: 12px;
}

/* insights aside */
.guide-aside {
  min-width: 0;
}

.guide-aside .aside-inner img {
  height: 100px;
}

.guide-list {
  list-style: none;
  padding: 0;
}

.guide-list li {
  padding: 6px 0;
  font-size: 14px;
  color: #4a5560;
  border-bottom: 1px solid #f0f4f8;
}

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

.aside-more {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid #e0e6ed;
}

.aside-more a {
  font-size: 14px;
  font-weight: 600;
  color: #e8743a;
}

.aside-nav {
  margin-top: 8px;
}

.aside-nav a {
  font-size: 14px;
  font-weight: 600;
  color: #e8743a;
}

/* ============================================================
   pages — methods.html
   ============================================================ */
.page-container {
  padding-bottom: 48px;
}

.page-intro {
  font-size: 16px;
  color: #4a5560;
  max-width: 860px;
}

/* 数据来源 */
.data-sources-section {
  padding: 32px 0;
}

.data-sources-section > h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.data-sources-section > p {
  font-size: 15px;
  color: #4a5560;
  margin-bottom: 24px;
}

.data-sources-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 32px;
}

.source-card {
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  padding: 28px;
}

.source-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
}

.source-card > p {
  font-size: 14px;
  color: #4a5560;
  margin-bottom: 16px;
}

.source-list li {
  padding: 6px 0;
  font-size: 14px;
  color: #4a5560;
  border-bottom: 1px solid #f0f4f8;
  display: flex;
  gap: 8px;
}

.source-list li::before {
  content: "·";
  color: #e8743a;
  font-weight: 700;
  flex-shrink: 0;
}

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

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

.methods-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: 8px;
}

.methods-figure figcaption {
  font-size: 13px;
  color: #6b7684;
  padding: 10px 4px 0;
  text-align: center;
}

/* 分析维度 */
.dimensions-section {
  padding: 32px 0;
  border-top: 1px solid #e0e6ed;
}

.dimensions-section > h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.section-desc {
  font-size: 15px;
  color: #4a5560;
  margin-bottom: 24px;
}

.dimensions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.dimension-item {
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  padding: 24px;
}

.dimension-item h3 {
  font-size: 16px;
  margin-bottom: 10px;
}

.dimension-item p {
  font-size: 14px;
  color: #4a5560;
  line-height: 1.6;
  margin-bottom: 12px;
}

.dimension-example {
  font-size: 13px;
  color: #6b7684;
  background-color: #f7f9fc;
  border-radius: 6px;
  padding: 10px 12px;
  margin: 0;
  line-height: 1.5;
}

/* 研究流程 */
.research-flow-section {
  padding: 32px 0;
  border-top: 1px solid #e0e6ed;
}

.research-flow-section > h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.flow-timeline {
  list-style: none;
  padding: 0;
  position: relative;
  padding-left: 32px;
}

.flow-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background-color: #e0e6ed;
}

.flow-step {
  position: relative;
  padding: 0 0 28px 24px;
}

.flow-step:last-child {
  padding-bottom: 0;
}

.flow-step::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: #16324f;
  border: 2px solid #ffffff;
  box-shadow: 0 0 0 2px #16324f;
}

.flow-step h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.flow-step p {
  font-size: 14px;
  color: #4a5560;
  line-height: 1.6;
  margin: 0;
}

/* 分析限制 */
.limits-section {
  padding: 32px 0;
  border-top: 1px solid #e0e6ed;
}

.limits-section > h2 {
  font-size: 24px;
  margin-bottom: 24px;
}

.limits-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.limit-item {
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  padding: 24px;
}

.limit-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.limit-item p {
  font-size: 14px;
  color: #4a5560;
  line-height: 1.6;
  margin: 0;
}

/* methods 相关链接 */
.methods-related {
  margin-top: 48px;
}

/* ============================================================
   pages — process.html
   ============================================================ */
.layout-shell {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 32px;
  align-items: start;
  padding-bottom: 48px;
}

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

.timeline-section {
  padding: 24px 0;
}

.timeline-section > h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.section-intro {
  font-size: 15px;
  color: #4a5560;
  margin-bottom: 24px;
}

.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background-color: #e0e6ed;
}

.timeline .timeline-item {
  position: relative;
  padding: 0 0 32px 24px;
}

.timeline .timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -28px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: #e8743a;
  border: 2px solid #ffffff;
  box-shadow: 0 0 0 2px #e8743a;
}

.timeline-content h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.timeline-content p {
  font-size: 14px;
  color: #4a5560;
  line-height: 1.6;
  margin-bottom: 8px;
}

.timeline-meta {
  font-size: 13px;
  color: #6b7684;
  background-color: #f0f4f8;
  border-radius: 4px;
  padding: 4px 10px;
  display: inline-block;
}

.process-figure {
  margin: 40px 0 24px;
}

.process-figure img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: 8px;
}

.process-figure figcaption {
  font-size: 13px;
  color: #6b7684;
  padding: 10px 4px 0;
  text-align: center;
}

/* 准备材料 */
.preparation-section {
  padding: 32px 0;
  border-top: 1px solid #e0e6ed;
}

.preparation-section > h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.preparation-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.prep-card {
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  padding: 24px;
}

.prep-card h3 {
  font-size: 16px;
  margin-bottom: 12px;
}

.prep-card ul {
  list-style: none;
  padding: 0;
}

.prep-card ul li {
  padding: 6px 0;
  font-size: 14px;
  color: #4a5560;
  border-bottom: 1px solid #f0f4f8;
  display: flex;
  gap: 8px;
}

.prep-card ul li::before {
  content: "·";
  color: #e8743a;
  font-weight: 700;
  flex-shrink: 0;
}

.prep-card ul li:last-child {
  border-bottom: none;
}

/* 沟通机制 */
.communication-section {
  padding: 32px 0;
  border-top: 1px solid #e0e6ed;
}

.communication-section > h2 {
  font-size: 24px;
  margin-bottom: 8px;
}

.communication-list {
  list-style: none;
  padding: 0;
}

.communication-list li {
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  padding: 20px 24px;
  margin-bottom: 12px;
}

.communication-list li:last-child {
  margin-bottom: 0;
}

.communication-list h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.communication-list p {
  font-size: 14px;
  color: #4a5560;
  line-height: 1.6;
  margin: 0;
}

/* checklist aside */
.checklist-aside {
  min-width: 0;
}

.checklist-aside > h2 {
  font-size: 18px;
  margin-bottom: 8px;
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px 8px 0 0;
  padding: 20px 24px 8px;
  margin-bottom: 0;
}

.aside-intro {
  font-size: 14px;
  color: #4a5560;
  background-color: #ffffff;
  border-left: 1px solid #e0e6ed;
  border-right: 1px solid #e0e6ed;
  padding: 0 24px 12px;
  margin: 0;
}

.checklist-aside .checklist {
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-top: none;
  border-radius: 0 0 8px 8px;
  padding: 8px 24px 16px;
}

.checklist-aside .checklist li {
  padding: 8px 0;
  font-size: 14px;
}

.checklist-aside .checklist li::before {
  content: "□";
  color: #e8743a;
  flex-shrink: 0;
}

.aside-note {
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  padding: 20px 24px;
  margin-top: 16px;
  font-size: 14px;
  color: #4a5560;
}

.aside-note a {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: #e8743a;
  margin-top: 8px;
}

/* ============================================================
   pages — faq.html
   ============================================================ */
.container {
  max-width: 1130px;
  margin: 0 auto;
  padding: 0 24px;
}

.page-title-area {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 32px;
  align-items: center;
  padding: 24px 0 8px;
}

.page-title-text p {
  font-size: 16px;
  color: #4a5560;
  margin: 0;
}

.page-title-figure img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: 8px;
}

.faq-group {
  padding: 24px 0;
  border-top: 1px solid #e0e6ed;
}

.faq-group:first-of-type {
  border-top: none;
}

.faq-group > h2 {
  font-size: 22px;
  margin-bottom: 20px;
}

.faq-list {
  padding: 0;
}

.support-entry {
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  padding: 28px;
  margin: 32px 0;
}

.support-entry h2 {
  font-size: 20px;
  margin-bottom: 12px;
}

.support-entry p {
  font-size: 14px;
  color: #4a5560;
  line-height: 1.7;
  margin: 0;
}

.support-entry a {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: #e8743a;
  margin: 8px 16px 0 0;
}

/* sidebar */
.sidebar {
  min-width: 0;
}

.sidebar-card {
  background-color: #ffffff;
  border: 1px solid #e0e6ed;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 16px;
}

.sidebar-card h3 {
  font-size: 16px;
  margin-bottom: 12px;
}

.sidebar-nav {
  list-style: none;
  padding: 0;
}

.sidebar-nav li {
  padding: 6px 0;
  border-bottom: 1px solid #f0f4f8;
}

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

.sidebar-nav a {
  font-size: 14px;
  color: #16324f;
}

.sidebar-nav a:hover {
  color: #e8743a;
}

/* ============================================================
   pages — 404.html
   ============================================================ */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
}

.error-content {
  text-align: center;
  max-width: 480px;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: #e8743a;
  line-height: 1;
  margin-bottom: 16px;
}

.error-content h1 {
  font-size: 24px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: #4a5560;
  margin-bottom: 24px;
}

.error-home-link {
  display: inline-block;
  padding: 12px 32px;
  background-color: #16324f;
  color: #ffffff;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  transition: background-color 0.2s ease;
}

.error-home-link:hover {
  background-color: #e8743a;
  color: #ffffff;
}

.error-help {
  font-size: 14px;
  color: #6b7684;
  margin-top: 16px;
}

/* ============================================================
   responsive — 响应式
   ============================================================ */
@media (max-width: 1024px) {
  .service-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .insights-preview-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  .page-layout {
    grid-template-columns: 1fr 240px;
  }

  .layout-shell {
    grid-template-columns: 1fr 240px;
  }

  .insights-layout {
    grid-template-columns: 1fr 240px;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }

  h1 {
    font-size: 24px;
  }

  h2 {
    font-size: 20px;
  }

  .header-inner {
    height: 60px;
    padding: 0 16px;
  }

  .brand-tagline {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: relative;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    flex-direction: column;
    background-color: #ffffff;
    border: 1px solid #e0e6ed;
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(22, 50, 79, 0.12);
    padding: 8px;
    min-width: 200px;
    z-index: 200;
  }

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

  .nav-link {
    padding: 12px 16px;
    font-size: 15px;
    border-radius: 6px;
  }

  .nav-link:hover {
    background-color: #f7f9fc;
  }

  .inner-main,
  .site-home .site-main,
  .container {
    padding: 0 16px;
  }

  .hero-section {
    padding: 32px 0;
  }

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

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

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

  .hero-actions .btn-primary,
  .hero-actions .btn-secondary {
    text-align: center;
  }

  .hero-figure img {
    height: 200px;
  }

  .service-index-section {
    padding: 32px 0;
  }

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

  .service-card img {
    height: 160px;
  }

  .insights-preview-section,
  .process-preview-section,
  .methods-overview-section,
  .faq-preview-section {
    padding: 32px 0;
  }

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

  .page-layout {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 16px 0 32px;
  }

  .layout-shell {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-bottom: 32px;
  }

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

  .page-title-area {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .page-title-figure img {
    height: 120px;
  }

  .service-card-grid {
    grid-template-columns: 1fr;
  }

  .service-card-grid .service-card {
    padding: 20px;
  }

  .service-card-grid .service-card img {
    height: 160px;
  }

  .comparison-table {
    min-width: 560px;
  }

  .table-wrapper {
    margin: 0 -16px;
    padding: 0 16px;
    border-radius: 0;
    border-left: none;
    border-right: none;
  }

  .steps-list li {
    padding-left: 52px;
  }

  .steps-list li::before {
    width: 34px;
    height: 34px;
  }

  .data-sources-grid {
    grid-template-columns: 1fr;
  }

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

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

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

  .report-item {
    grid-template-columns: 1fr;
  }

  .report-thumb img {
    width: 100%;
    height: 140px;
  }

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

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 16px 24px;
  }

  .footer-bottom {
    padding: 16px;
  }

  .related-links {
    margin: 32px 16px 0;
    padding: 16px;
  }

  .filter-tabs a {
    padding: 10px 16px;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }

  .faq-item summary {
    padding: 16px;
    font-size: 15px;
    min-height: 44px;
  }

  .faq-item p,
  .faq-answer {
    padding: 0 16px 16px;
  }

  .checklist li {
    padding: 12px 0;
  }

  .checklist li::before {
    font-size: 18px;
  }

  .source-card,
  .dimension-item,
  .limit-item,
  .prep-card {
    padding: 20px;
  }

  .flow-timeline {
    padding-left: 28px;
  }

  .flow-step {
    padding-left: 20px;
  }

  .flow-step::before {
    left: -24px;
    width: 12px;
    height: 12px;
  }

  .timeline {
    padding-left: 28px;
  }

  .timeline .timeline-item {
    padding-left: 20px;
  }

  .timeline-marker {
    left: -24px;
    width: 14px;
    height: 14px;
  }

  .timeline-preview {
    padding-left: 24px;
  }

  .timeline-dot {
    left: -20px;
    width: 10px;
    height: 10px;
  }

  .timeline-content {
    padding-left: 4px;
  }

  .checklist-aside .checklist,
  .checklist-aside > h2,
  .aside-intro {
    border-radius: 8px;
  }

  .checklist-aside > h2 {
    border-radius: 8px 8px 0 0;
    margin-bottom: 0;
  }

  .checklist-aside .checklist {
    border-radius: 0 0 8px 8px;
  }

  .sidebar-card {
    padding: 20px;
  }

  .support-entry {
    padding: 20px;
  }

  .error-code {
    font-size: 56px;
  }
}

@media (max-width: 480px) {
  .header-inner {
    gap: 12px;
  }

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

  .nav-list {
    min-width: 180px;
    right: -8px;
  }

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

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

  .hero-figure img {
    height: 180px;
  }

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

  .service-card {
    padding: 20px;
  }

  .service-card img {
    height: 150px;
  }

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

  .insight-item {
    padding: 16px;
  }

  .methods-col {
    padding: 20px;
  }

  .timeline-preview {
    padding-left: 20px;
  }

  .timeline-dot {
    left: -16px;
    width: 10px;
    height: 10px;
  }

  .timeline-title {
    font-size: 16px;
  }

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

  .breadcrumb {
    font-size: 13px;
    padding-top: 16px;
  }

  .page-header {
    padding: 12px 0 4px;
  }

  .page-title-block {
    padding: 4px 0 16px;
  }

  .service-card-grid .service-card img {
    height: 140px;
  }

  .report-item {
    padding: 16px;
  }

  .report-thumb img {
    height: 120px;
  }

  .report-title {
    font-size: 16px;
  }

  .report-structure {
    padding: 20px;
  }

  .structure-list li {
    padding: 10px 12px;
  }

  .dimension-item,
  .limit-item,
  .prep-card {
    padding: 16px;
  }

  .source-card {
    padding: 20px;
  }

  .methods-figure img {
    height: 180px;
  }

  .process-figure img {
    height: 180px;
  }

  .preparation-grid {
    gap: 16px;
  }

  .communication-list li {
    padding: 16px 20px;
  }

  .footer-brand-name {
    font-size: 18px;
  }

  .footer-inner {
    gap: 24px;
  }

  .related-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .related-links-item {
    width: 100%;
    text-align: center;
  }

  .filter-tabs {
    gap: 6px;
  }

  .filter-tabs a {
    padding: 8px 12px;
    font-size: 13px;
  }

  .page-title-area {
    gap: 12px;
  }

  .page-title-figure img {
    height: 100px;
  }

  .steps-list li {
    padding: 14px 0 14px 48px;
  }

  .steps-list li::before {
    width: 32px;
    height: 32px;
    font-size: 14px;
  }

  .error-code {
    font-size: 48px;
  }
}