/* ==========================================================
   51吃瓜全网更新最快 · 整站样式表
   现代主义海报风：深蓝 / 橙红 / 米白 / 深绿
   ========================================================== */

/* ----------------------------------------------------------
   Base —— 全局基础
   ---------------------------------------------------------- */
:root {
  --color-primary: #0F2040;
  --color-accent: #F26430;
  --color-bg: #F5F3EF;
  --color-green: #1F8A70;
  --color-text: #2B2B2B;
  --color-card: #E8E6E1;
  --color-white: #FFFFFF;
  --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --container-w: 1200px;
  --radius: 8px;
  --transition: 0.25s ease;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

a:hover {
  color: var(--color-accent);
}

ul,
ol {
  list-style: none;
}

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

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

/* ----------------------------------------------------------
   Layout —— 页头 / 页脚 / 容器
   ---------------------------------------------------------- */
.site-header {
  background-color: var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(15, 32, 64, 0.15);
}

.header-inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.brand-link:hover .brand-text {
  color: var(--color-accent);
}

.main-nav {
  display: flex;
  align-items: center;
}

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

.nav-item {
  display: inline-block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  border-radius: 4px;
  transition: background-color var(--transition), color var(--transition);
}

.nav-item:hover {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.08);
}

.nav-item.is-current {
  color: var(--color-white);
  background-color: var(--color-accent);
  font-weight: 600;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: 4px;
  padding: 8px;
}

.menu-toggle:hover {
  background-color: rgba(255, 255, 255, 0.08);
}

.menu-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 页脚 */
.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.8);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 48px 24px 24px;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 48px;
}

.footer-brand {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
}

.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.65);
}

.footer-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 16px;
}

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

.footer-link {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition);
}

.footer-link:hover {
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 24px;
  text-align: center;
}

.copyright {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
}

/* 内页通用容器 */
.inner-main {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 32px 24px 64px;
  width: 100%;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: rgba(43, 43, 43, 0.6);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-card);
}

.breadcrumb a {
  color: var(--color-primary);
  font-weight: 500;
}

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

.breadcrumb-sep {
  color: rgba(43, 43, 43, 0.35);
}

.breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
}

/* 页面标题区 */
.page-header {
  margin-bottom: 16px;
}

.page-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
}

.page-title-block {
  margin-bottom: 28px;
}

.page-lead {
  font-size: 17px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.8);
  max-width: 720px;
}

/* 返回按钮 */
.return-btn-wrap,
.return-button-wrap,
.return-row,
.return-action {
  margin-bottom: 32px;
}

.return-btn,
.return-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius);
  transition: background-color var(--transition), color var(--transition);
}

.return-btn:hover,
.return-button:hover {
  background-color: var(--color-accent);
  color: var(--color-white);
}

/* 通用区块标题 */
.section-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.4;
  margin-bottom: 16px;
}

/* 通用正文链接 */
.text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-accent);
}

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

/* 相关链接导航 */
.related-links {
  margin-top: 40px;
  padding: 20px 24px;
  background-color: var(--color-card);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin-right: 4px;
}

.related-links-item {
  font-size: 14px;
  color: var(--color-primary);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), color var(--transition);
}

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

/* ----------------------------------------------------------
   Components —— 按钮 / 卡片 / FAQ / 步骤条
   ---------------------------------------------------------- */
.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}

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

.btn-primary:hover {
  background-color: #d9531f;
  color: var(--color-white);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-white);
  border: 2px solid rgba(255, 255, 255, 0.6);
}

.btn-secondary:hover {
  border-color: var(--color-white);
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.1);
}

/* FAQ 手风琴 */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-card);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color var(--transition);
}

.faq-item:hover {
  border-color: rgba(15, 32, 64, 0.3);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  min-height: 52px;
  list-style: none;
}

.faq-question::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform var(--transition);
}

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

.faq-answer {
  padding: 0 20px 16px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.8);
}

.faq-answer p + p {
  margin-top: 8px;
}

/* ----------------------------------------------------------
   Pages —— 首页
   ---------------------------------------------------------- */
.home-main {
  width: 100%;
}

/* 首屏 hero */
.hero-section {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 56px 0;
}

.hero-layout {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
}

.hero-title {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-white);
  margin-bottom: 16px;
}

.hero-subtitle {
  font-size: 17px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 32px;
  max-width: 520px;
}

.hero-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.hero-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 20px;
  background-color: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  transition: background-color var(--transition), border-color var(--transition);
}

.hero-card:hover {
  background-color: rgba(255, 255, 255, 0.14);
  border-color: var(--color-accent);
}

.card-index {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
  min-width: 28px;
  line-height: 1.4;
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 4px;
}

.card-desc {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.7);
}

.card-link {
  display: inline-block;
  margin-top: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
}

.hero-card:hover .card-link {
  color: var(--color-white);
}

.hero-right {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.hero-figure {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.hero-image {
  width: 100%;
  height: 300px;
  object-fit: cover;
}

.hero-quote {
  font-size: 16px;
  font-weight: 500;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.9);
  border-left: 3px solid var(--color-accent);
  padding-left: 16px;
}

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

/* 服务分类矩阵 */
.service-matrix-section {
  padding: 64px 24px;
  max-width: var(--container-w);
  margin: 0 auto;
  width: 100%;
}

.section-header {
  margin-bottom: 32px;
}

.section-desc {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.75);
  max-width: 640px;
}

.matrix-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.matrix-block {
  padding: 28px 24px;
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 200px;
  transition: transform var(--transition), box-shadow var(--transition);
}

.matrix-block:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(15, 32, 64, 0.12);
}

.matrix-blue {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.matrix-orange {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.matrix-green {
  background-color: var(--color-green);
  color: var(--color-white);
}

.matrix-title {
  font-size: 18px;
  font-weight: 700;
  color: inherit;
}

.matrix-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
  flex: 1;
}

.matrix-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-white);
  border-bottom: 1px solid rgba(255, 255, 255, 0.4);
  align-self: flex-start;
  padding-bottom: 2px;
  transition: border-color var(--transition);
}

.matrix-link:hover {
  color: var(--color-white);
  border-color: var(--color-white);
}

/* 方法说明摘要 */
.method-overview-section {
  background-color: var(--color-card);
  padding: 64px 24px;
}

.method-overview-section .section-header {
  max-width: var(--container-w);
  margin-left: auto;
  margin-right: auto;
}

.method-steps {
  max-width: var(--container-w);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0;
  counter-reset: step-counter;
}

.step-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid rgba(15, 32, 64, 0.1);
  position: relative;
}

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

.step-num {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 700;
  border-radius: 50%;
}

.step-text {
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  padding-top: 4px;
}

.step-text strong {
  color: var(--color-primary);
  font-weight: 600;
  margin-right: 4px;
}

.section-footer-link {
  max-width: var(--container-w);
  margin: 32px auto 0;
}

/* 更新记录预览 */
.update-log-preview-section {
  padding: 64px 24px;
  max-width: var(--container-w);
  margin: 0 auto;
  width: 100%;
}

.log-preview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.log-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-card);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.log-card:hover {
  border-color: rgba(15, 32, 64, 0.25);
  box-shadow: 0 4px 16px rgba(15, 32, 64, 0.08);
}

.log-tag {
  display: inline-block;
  align-self: flex-start;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-white);
  background-color: var(--color-green);
  border-radius: 4px;
}

.log-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.4;
}

.log-summary {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.75);
}

.log-preview-figure {
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 24px;
}

.log-preview-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

/* 专题路径预览 */
.topic-path-preview-section {
  background-color: var(--color-card);
  padding: 64px 24px;
}

.topic-path-preview-section .section-header,
.topic-path-preview-section .section-footer-link {
  max-width: var(--container-w);
  margin-left: auto;
  margin-right: auto;
}

.path-preview-grid {
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.path-card {
  display: block;
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 28px 24px;
  border: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.path-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 16px rgba(15, 32, 64, 0.08);
}

.path-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.path-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.75);
  margin-bottom: 12px;
}

.path-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.path-card:hover .path-link {
  color: var(--color-primary);
}

/* FAQ 预览 */
.faq-preview-section {
  padding: 64px 24px;
  max-width: var(--container-w);
  margin: 0 auto;
  width: 100%;
}

.faq-preview-section .faq-list {
  margin-bottom: 24px;
}

/* 机构与反馈 */
.about-feedback-section {
  background-color: var(--color-primary);
  padding: 64px 24px;
  color: var(--color-white);
}

.about-feedback-layout {
  max-width: var(--container-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.about-block,
.feedback-block {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.block-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-white);
}

.block-text {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
}

.about-feedback-section .text-link {
  color: var(--color-accent);
  align-self: flex-start;
}

.about-feedback-section .text-link:hover {
  color: var(--color-white);
}

/* ----------------------------------------------------------
   Pages —— 服务分类
   ---------------------------------------------------------- */
.catalog-intro {
  display: grid;
  grid-template-columns: 1fr 0.8fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 48px;
}

.catalog-intro-text h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.catalog-intro-text p {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.8);
  margin-bottom: 12px;
}

.catalog-intro-media {
  border-radius: var(--radius);
  overflow: hidden;
}

.catalog-media-img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.catalog-list {
  margin-bottom: 48px;
}

.catalog-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-card);
  border-radius: var(--radius);
  padding: 28px 32px;
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.catalog-item:hover {
  border-color: rgba(15, 32, 64, 0.25);
  box-shadow: 0 4px 16px rgba(15, 32, 64, 0.06);
}

.catalog-item-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.catalog-item-head h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
}

.catalog-tag {
  padding: 4px 14px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 13px;
  font-weight: 600;
  border-radius: 4px;
}

.catalog-item-desc {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.8);
}

.catalog-points {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 4px;
}

.catalog-points li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(43, 43, 43, 0.75);
}

.catalog-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.catalog-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  align-self: flex-start;
}

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

.boundary-note {
  background-color: var(--color-card);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 40px;
}

.boundary-note h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.boundary-note > p {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.8);
  margin-bottom: 16px;
}

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.boundary-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(43, 43, 43, 0.75);
}

.boundary-list li::before {
  content: "•";
  position: absolute;
  left: 4px;
  color: var(--color-accent);
  font-weight: 700;
}

.boundary-more {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.75);
}

.boundary-more a {
  color: var(--color-accent);
  font-weight: 600;
}

.boundary-more a:hover {
  color: var(--color-primary);
}

/* ----------------------------------------------------------
   Pages —— 方法说明
   ---------------------------------------------------------- */
.method-framework {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 48px;
}

.framework-media {
  border-radius: var(--radius);
  overflow: hidden;
}

.framework-media img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.framework-text h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.framework-text p {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.8);
  margin-bottom: 12px;
}

.process-timeline {
  margin-bottom: 48px;
}

.timeline-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  margin-top: 24px;
}

.timeline-item {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding: 20px 0;
  position: relative;
  border-bottom: 1px solid var(--color-card);
}

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

.timeline-item .step-num {
  background-color: var(--color-primary);
  color: var(--color-white);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
}

.step-content {
  flex: 1;
  padding-top: 4px;
}

.step-content h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.step-content p {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.8);
}

.applicable-note {
  background-color: var(--color-card);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 40px;
}

.applicable-note h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.applicable-note p {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.8);
  margin-bottom: 12px;
}

.applicable-note p:last-child {
  margin-bottom: 0;
}

/* ----------------------------------------------------------
   Pages —— 更新记录
   ---------------------------------------------------------- */
.page-title-area {
  margin-bottom: 16px;
}

.log-intro {
  display: grid;
  grid-template-columns: 1fr 0.8fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 48px;
}

.log-intro-text h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.log-intro-text p {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.8);
}

.log-intro-media {
  border-radius: var(--radius);
  overflow: hidden;
}

.log-intro-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.log-list {
  margin-bottom: 40px;
}

.log-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-card);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-bottom: 16px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.log-item:hover {
  border-color: rgba(15, 32, 64, 0.25);
  box-shadow: 0 4px 12px rgba(15, 32, 64, 0.06);
}

.log-item-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.log-type {
  display: inline-block;
  padding: 3px 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-white);
  background-color: var(--color-green);
  border-radius: 4px;
}

.log-date {
  font-size: 13px;
  color: rgba(43, 43, 43, 0.55);
}

.log-item h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
  line-height: 1.4;
}

.log-item p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.75);
}

.feedback-entry {
  background-color: var(--color-primary);
  border-radius: var(--radius);
  padding: 32px;
  color: var(--color-white);
  margin-bottom: 40px;
}

.feedback-entry h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
}

.feedback-entry p {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 16px;
}

.feedback-entry .text-link {
  color: var(--color-accent);
}

.feedback-entry .text-link:hover {
  color: var(--color-white);
}

/* ----------------------------------------------------------
   Pages —— 专题路径
   ---------------------------------------------------------- */
.path-groups {
  margin-bottom: 48px;
}

.path-group-intro {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 32px;
}

.path-group-figure {
  border-radius: var(--radius);
  overflow: hidden;
}

.path-group-image {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.path-group-description {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.8);
}

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

.path-group-item {
  background-color: var(--color-card);
  border-radius: var(--radius);
  padding: 24px;
  transition: background-color var(--transition);
}

.path-group-item:hover {
  background-color: #ddd9d2;
}

.path-group-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.path-group-text {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.75);
}

.path-grid-section {
  margin-bottom: 48px;
}

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

.path-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-card);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.path-card:hover {
  border-color: rgba(15, 32, 64, 0.3);
  box-shadow: 0 4px 16px rgba(15, 32, 64, 0.08);
}

.path-card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
}

.path-card-text {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.75);
  flex: 1;
}

.path-card-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  align-self: flex-start;
}

.path-card-link:hover {
  color: var(--color-primary);
}

.selection-tip {
  background-color: var(--color-card);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 40px;
}

.selection-tip-text {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.8);
  margin-bottom: 12px;
}

.selection-tip-link a {
  color: var(--color-accent);
  font-weight: 600;
}

.selection-tip-link a:hover {
  color: var(--color-primary);
}

/* ----------------------------------------------------------
   Pages —— 常见问题
   ---------------------------------------------------------- */
.faq-intro {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 48px;
}

.faq-intro-media {
  border-radius: var(--radius);
  overflow: hidden;
}

.faq-figure {
  border-radius: var(--radius);
  overflow: hidden;
}

.faq-image {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.faq-intro-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-intro-text {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.8);
}

.faq-intro-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.inline-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

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

.faq-groups {
  margin-bottom: 48px;
}

.faq-group {
  margin-bottom: 36px;
}

.faq-group-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.faq-group-desc {
  margin-bottom: 16px;
}

.faq-group-desc p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.7);
}

.unresolved-note {
  background-color: var(--color-primary);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 40px;
}

.unresolved-content h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
}

.unresolved-text {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 20px;
}

.unresolved-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.action-link {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius);
  transition: background-color var(--transition);
}

.action-link:hover {
  background-color: #d9531f;
  color: var(--color-white);
}

/* ----------------------------------------------------------
   Pages —— 机构说明
   ---------------------------------------------------------- */
.page-intro {
  font-size: 17px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.8);
  max-width: 720px;
}

.about-position {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  margin-bottom: 48px;
}

.position-text h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.position-text p {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.8);
  margin-bottom: 12px;
}

.position-text p:last-child {
  margin-bottom: 0;
}

.position-figure {
  border-radius: var(--radius);
  overflow: hidden;
}

.position-figure img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

.work-principles {
  margin-bottom: 48px;
}

.principles-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 24px;
}

.principle-item {
  background-color: var(--color-white);
  border: 1px solid var(--color-card);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.principle-item:hover {
  border-color: rgba(15, 32, 64, 0.25);
  box-shadow: 0 4px 12px rgba(15, 32, 64, 0.06);
}

.principle-item h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.principle-item p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.75);
}

.feedback-mechanism {
  background-color: var(--color-card);
  border-radius: var(--radius);
  padding: 32px;
  margin-bottom: 40px;
}

.feedback-content h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.feedback-content > p {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.8);
  margin-bottom: 20px;
}

.feedback-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feedback-links li a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.feedback-links li a:hover {
  color: var(--color-primary);
}

/* ----------------------------------------------------------
   Pages —— 404
   ---------------------------------------------------------- */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  min-height: 60vh;
}

.error-content {
  text-align: center;
  max-width: 560px;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.error-desc {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(43, 43, 43, 0.75);
  margin-bottom: 32px;
}

.error-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

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

.error-actions .btn-secondary {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.error-actions .btn-secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* ----------------------------------------------------------
   Responsive —— 响应式断点
   ---------------------------------------------------------- */
@media (max-width: 1024px) {
  .matrix-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .matrix-block:last-child {
    grid-column: span 2;
  }

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

  .hero-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .catalog-intro,
  .method-framework,
  .log-intro,
  .path-group-intro,
  .faq-intro,
  .about-position {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  .footer-about {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  .header-inner {
    padding: 0 16px;
    min-height: 60px;
  }

  .menu-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    padding: 0;
    box-shadow: 0 8px 16px rgba(15, 32, 64, 0.2);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0 16px;
  }

  .nav-item {
    display: block;
    padding: 14px 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 0;
  }

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

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

  .menu-toggle[aria-expanded="true"] + .site-nav {
    max-height: 480px;
  }

  .site-nav.is-open {
    max-height: 480px;
  }

  .hero-section {
    padding: 40px 0;
  }

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

  .hero-subtitle {
    font-size: 16px;
  }

  .hero-image {
    height: 220px;
  }

  .service-matrix-section,
  .update-log-preview-section,
  .faq-preview-section {
    padding: 48px 16px;
  }

  .method-overview-section,
  .topic-path-preview-section,
  .about-feedback-section {
    padding: 48px 16px;
  }

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

  .matrix-block:last-child {
    grid-column: span 1;
  }

  .log-preview-grid {
    grid-template-columns: 1fr;
  }

  .path-preview-grid {
    grid-template-columns: 1fr;
  }

  .about-feedback-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

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

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

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

  .footer-about {
    grid-column: span 1;
  }

  .inner-main {
    padding: 24px 16px 48px;
  }

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

  .page-lead {
    font-size: 16px;
  }

  .breadcrumb {
    font-size: 13px;
    margin-bottom: 16px;
    padding-bottom: 12px;
  }

  .catalog-item {
    padding: 20px;
  }

  .catalog-item-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .boundary-note,
  .applicable-note,
  .feedback-entry,
  .selection-tip,
  .unresolved-note,
  .feedback-mechanism {
    padding: 24px 20px;
  }

  .timeline-item {
    gap: 16px;
  }

  .timeline-item .step-num {
    width: 36px;
    height: 36px;
    font-size: 14px;
  }

  .log-item {
    padding: 20px;
  }

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

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

@media (max-width: 480px) {
  .brand-text {
    font-size: 17px;
  }

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

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

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

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

  .hero-card {
    padding: 14px 16px;
  }

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

  .card-desc {
    font-size: 13px;
  }

  .section-title {
    font-size: 20px;
  }

  .section-desc {
    font-size: 14px;
  }

  .step-item {
    gap: 14px;
    padding: 16px 0;
  }

  .step-num {
    width: 32px;
    height: 32px;
    font-size: 14px;
  }

  .step-text {
    font-size: 14px;
  }

  .log-card {
    padding: 20px;
  }

  .path-card {
    padding: 20px;
  }

  .block-title {
    font-size: 20px;
  }

  .block-text {
    font-size: 14px;
  }

  .catalog-intro-media img,
  .log-intro-media img,
  .path-group-image,
  .faq-image,
  .position-figure img,
  .framework-media img {
    height: 200px;
  }

  .related-links {
    padding: 16px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

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

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