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

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

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

body {
  margin: 0;
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: #2B2B2B;
  background-color: #F7F5F2;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: #1B3A5C;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #E07A5F;
}

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

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  line-height: 1.3;
  font-weight: 700;
  color: #1B3A5C;
}

p {
  margin: 0;
}

figure {
  margin: 0;
}

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
   ========================================================================== */

.site-header {
  background-color: #FFFFFF;
  border-bottom: 1px solid #E8E4DE;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1200px;
  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: 24px;
  font-weight: 700;
  color: #1B3A5C;
  letter-spacing: 0.02em;
}

.brand-tagline {
  font-size: 13px;
  color: #6B7280;
  display: none;
}

.site-nav {
  margin-left: auto;
}

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: #2B2B2B;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-list li a:hover {
  color: #1B3A5C;
  background-color: #F7F5F2;
}

.nav-list li a.is-current {
  color: #FFFFFF;
  background-color: #1B3A5C;
  font-weight: 600;
}

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

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: #1B3A5C;
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

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

.inner-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px 64px;
}

.site-footer {
  background-color: #FFFFFF;
  border-top: 1px solid #E8E4DE;
}

.footer-top {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: 48px;
}

.footer-brand p {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.8;
  max-width: 320px;
}

.footer-brand p strong {
  display: block;
  font-size: 20px;
  color: #1B3A5C;
  margin-bottom: 8px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.footer-group h3 {
  font-size: 15px;
  margin-bottom: 12px;
  color: #1B3A5C;
}

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

.footer-group ul li a {
  font-size: 14px;
  color: #6B7280;
}

.footer-group ul li a:hover {
  color: #E07A5F;
}

.footer-bottom {
  border-top: 1px solid #E8E4DE;
  padding: 20px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: #9CA3AF;
}

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

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: #6B7280;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: #6B7280;
}

.breadcrumb a:hover {
  color: #E07A5F;
}

.breadcrumb-sep {
  color: #C0C4CC;
}

.breadcrumb-current {
  color: #2B2B2B;
  font-weight: 500;
}

.page-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid #E8E4DE;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: #1B3A5C;
  margin-bottom: 12px;
  line-height: 1.3;
}

.page-description {
  font-size: 16px;
  color: #6B7280;
  max-width: 720px;
  line-height: 1.7;
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  align-items: start;
}

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

.sidebar {
  min-width: 0;
}

.sidebar-block {
  background-color: #FFFFFF;
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 24px;
}

.sidebar-block h2 {
  font-size: 18px;
  margin-bottom: 12px;
  color: #1B3A5C;
}

.sidebar-block p {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.7;
  margin-bottom: 12px;
}

.sidebar-block p:last-child {
  margin-bottom: 0;
}

.principle-list li {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.7;
  padding-left: 16px;
  position: relative;
  margin-bottom: 8px;
}

.principle-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #E07A5F;
}

.archive-note {
  margin-top: 48px;
  padding: 16px 24px;
  background-color: #FFFFFF;
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  font-size: 14px;
  color: #6B7280;
  text-align: center;
}

.related-links {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.related-links-label {
  font-size: 14px;
  color: #6B7280;
  font-weight: 500;
}

.related-links-item {
  font-size: 14px;
  color: #1B3A5C;
  padding: 6px 14px;
  border: 1px solid #E8E4DE;
  border-radius: 6px;
  background-color: #FFFFFF;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.related-links-item:hover {
  border-color: #E07A5F;
  color: #E07A5F;
}

/* 首页 hero */
.hero-focus {
  position: relative;
  background-color: #1B3A5C;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.35;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 24px;
  color: #FFFFFF;
}

.hero-content h1 {
  color: #FFFFFF;
  font-size: 40px;
  line-height: 1.3;
  margin-bottom: 16px;
  max-width: 640px;
}

.hero-slogan {
  font-size: 20px;
  color: #E8E4DE;
  margin-bottom: 12px;
  font-weight: 500;
}

.hero-lead {
  font-size: 16px;
  color: #D1D5DB;
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: 32px;
}

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

.btn {
  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: #E07A5F;
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: #C96A50;
  color: #FFFFFF;
}

.btn-secondary {
  background-color: transparent;
  color: #FFFFFF;
  border: 1px solid #FFFFFF;
}

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
}

/* 首页目录条 */
.section-directory {
  background-color: #FFFFFF;
  border-bottom: 1px solid #E8E4DE;
}

.directory-list {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.directory-list li a {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background-color: #F7F5F2;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 500;
  color: #1B3A5C;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.directory-list li a::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background-color: #E07A5F;
  flex-shrink: 0;
}

.directory-list li a:hover {
  background-color: #1B3A5C;
  color: #FFFFFF;
}

/* 首页布局 */
.home-main {
  background-color: #F7F5F2;
}

.home-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 48px;
  align-items: start;
}

.section-heading {
  margin-bottom: 24px;
}

.section-heading h2 {
  font-size: 24px;
  color: #1B3A5C;
  margin-bottom: 8px;
}

.section-desc {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.7;
}

/* 频道卡片 */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.channel-card {
  background-color: #FFFFFF;
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.channel-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(27, 58, 92, 0.08);
}

.channel-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.channel-card h3 {
  font-size: 18px;
  color: #1B3A5C;
  padding: 16px 16px 8px;
}

.channel-card p {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.7;
  padding: 0 16px;
  margin-bottom: 12px;
}

.channel-card a {
  display: inline-block;
  font-size: 14px;
  color: #E07A5F;
  font-weight: 500;
  padding: 0 16px 16px;
}

.channel-card a:hover {
  color: #C96A50;
}

/* 首页侧栏 */
.home-aside {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.guide-summary,
.boundary-summary {
  background-color: #FFFFFF;
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  padding: 24px;
}

.guide-summary h2,
.boundary-summary h2 {
  font-size: 18px;
  color: #1B3A5C;
  margin-bottom: 16px;
}

.guide-steps {
  counter-reset: guide-step;
}

.guide-steps li {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  align-items: flex-start;
}

.guide-steps li:last-child {
  margin-bottom: 0;
}

.step-num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background-color: #1B3A5C;
  color: #FFFFFF;
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

.guide-steps li p {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.6;
  padding-top: 2px;
}

.aside-link {
  display: inline-block;
  margin-top: 16px;
  font-size: 14px;
  font-weight: 500;
  color: #E07A5F;
}

.aside-link:hover {
  color: #C96A50;
}

.boundary-list li {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.6;
  padding-left: 20px;
  position: relative;
  margin-bottom: 10px;
}

.boundary-list li::before {
  content: '×';
  position: absolute;
  left: 0;
  top: 0;
  color: #E07A5F;
  font-weight: 700;
  font-size: 16px;
}

/* 首页专题精选 */
.specials-featured {
  background-color: #FFFFFF;
  border-top: 1px solid #E8E4DE;
  border-bottom: 1px solid #E8E4DE;
}

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

.specials-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 48px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.special-card {
  background-color: #F7F5F2;
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.special-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(27, 58, 92, 0.08);
}

.special-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.special-card h3 {
  font-size: 18px;
  color: #1B3A5C;
  padding: 16px 16px 8px;
}

.special-card p {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.7;
  padding: 0 16px;
  margin-bottom: 12px;
}

.special-card a {
  display: inline-block;
  font-size: 14px;
  color: #E07A5F;
  font-weight: 500;
  padding: 0 16px 16px;
}

.special-card a:hover {
  color: #C96A50;
}

/* 首页全站索引 */
.site-index {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px;
}

.site-index-list {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.site-index-list li a {
  display: block;
  padding: 16px;
  background-color: #FFFFFF;
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  color: #1B3A5C;
  text-align: center;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.site-index-list li a:hover {
  background-color: #1B3A5C;
  color: #FFFFFF;
}

.site-index-list li span {
  display: block;
  font-size: 13px;
  color: #6B7280;
  font-weight: 400;
  margin-top: 4px;
  line-height: 1.5;
}

/* ==========================================================================
   pages
   ========================================================================== */

/* ---------- channels ---------- */

.channel-list-section {
  margin-bottom: 32px;
}

.channel-list-section h2 {
  font-size: 24px;
  color: #1B3A5C;
  margin-bottom: 8px;
}

.section-intro {
  font-size: 14px;
  color: #6B7280;
  margin-bottom: 24px;
}

.channel-figure {
  overflow: hidden;
}

.channel-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.channel-body {
  padding: 0;
}

.channel-body h3 {
  font-size: 18px;
  color: #1B3A5C;
  padding: 16px 16px 8px;
}

.channel-body p {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.7;
  padding: 0 16px;
  margin-bottom: 12px;
}

.channel-body a {
  display: inline-block;
  font-size: 14px;
  color: #E07A5F;
  font-weight: 500;
  padding: 0 16px 16px;
}

.channel-body a:hover {
  color: #C96A50;
}

/* ---------- specials ---------- */

.special-list .section-title {
  font-size: 24px;
  color: #1B3A5C;
  margin-bottom: 24px;
}

.special-list {
  min-width: 0;
}

.special-list .special-card {
  display: grid;
  grid-template-columns: 280px 1fr;
  margin-bottom: 24px;
  background-color: #FFFFFF;
}

.special-figure {
  overflow: hidden;
}

.special-figure img {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.special-body {
  padding: 20px 24px;
  min-width: 0;
}

.special-body h3 {
  font-size: 20px;
  color: #1B3A5C;
  margin-bottom: 8px;
}

.special-desc {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.7;
  margin-bottom: 12px;
}

.special-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.tag {
  display: inline-block;
  padding: 4px 12px;
  background-color: #F7F5F2;
  border: 1px solid #E8E4DE;
  border-radius: 4px;
  font-size: 13px;
  color: #6B7280;
}

.special-related {
  font-size: 14px;
  color: #6B7280;
}

.special-related a {
  color: #E07A5F;
  font-weight: 500;
  margin-right: 12px;
}

.special-related a:hover {
  color: #C96A50;
}

.special-aside {
  min-width: 0;
}

.special-aside .aside-title {
  font-size: 18px;
  color: #1B3A5C;
  margin-bottom: 16px;
}

.aside-steps {
  counter-reset: aside-step;
}

.aside-steps li {
  position: relative;
  padding-left: 40px;
  margin-bottom: 20px;
}

.aside-steps li::before {
  counter-increment: aside-step;
  content: counter(aside-step);
  position: absolute;
  left: 0;
  top: 0;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background-color: #1B3A5C;
  color: #FFFFFF;
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

.aside-steps li h3 {
  font-size: 15px;
  color: #1B3A5C;
  margin-bottom: 4px;
}

.aside-steps li p {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.6;
}

.aside-note {
  background-color: #F7F5F2;
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  padding: 16px;
  font-size: 14px;
  color: #6B7280;
  line-height: 1.7;
}

.aside-note p a {
  color: #E07A5F;
  font-weight: 500;
}

.aside-note p a:hover {
  color: #C96A50;
}

.specials-page .archive-note {
  margin-top: 32px;
}

.specials-page .site-index {
  padding: 48px 0 0;
}

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

.specials-page .index-list li a {
  display: flex;
  flex-direction: column;
  padding: 20px;
  background-color: #FFFFFF;
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  color: #1B3A5C;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.specials-page .index-list li a:hover {
  border-color: #E07A5F;
  box-shadow: 0 4px 16px rgba(224, 122, 95, 0.1);
}

.specials-page .index-list li span {
  font-size: 13px;
  color: #6B7280;
  font-weight: 400;
  margin-top: 4px;
  line-height: 1.5;
}

/* ---------- guide ---------- */

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

.section-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 40px;
  align-items: start;
}

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

.section-content h2 {
  font-size: 24px;
  color: #1B3A5C;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid #E07A5F;
  display: inline-block;
}

.section-content p {
  font-size: 15px;
  color: #4B5563;
  line-height: 1.8;
  margin-bottom: 16px;
}

.guide-figure {
  background-color: #FFFFFF;
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  overflow: hidden;
}

.guide-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: #6B7280;
  background-color: #F7F5F2;
  text-align: center;
}

.step-list {
  margin: 24px 0;
}

.step-item {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  align-items: flex-start;
}

.step-number {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background-color: #1B3A5C;
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.step-body p {
  font-size: 15px;
  color: #4B5563;
  line-height: 1.7;
  margin-bottom: 0;
}

.tip-block {
  background-color: #FDF6F3;
  border-left: 4px solid #E07A5F;
  border-radius: 0 6px 6px 0;
  padding: 16px 20px;
  margin: 24px 0;
}

.tip-block p {
  font-size: 14px;
  color: #4B5563;
  line-height: 1.7;
  margin-bottom: 0;
}

.tip-block strong {
  color: #1B3A5C;
  display: block;
  margin-bottom: 4px;
}

.boundary-block {
  background-color: #FFFFFF;
  border: 1px solid #E8E4DE;
  border-left: 4px solid #1B3A5C;
  border-radius: 0 6px 6px 0;
  padding: 20px 24px;
  margin: 24px 0;
}

.boundary-block p {
  font-size: 14px;
  color: #4B5563;
  line-height: 1.7;
  margin-bottom: 12px;
}

.boundary-block p strong {
  color: #1B3A5C;
  display: block;
  margin-bottom: 4px;
}

.boundary-block ul li {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.7;
  padding-left: 20px;
  position: relative;
  margin-bottom: 8px;
}

.boundary-block ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #1B3A5C;
}

.section-content .section-content-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: #E07A5F;
  margin-top: 8px;
}

.section-content .section-content-link:hover {
  color: #C96A50;
}

/* 阅读进度条 */
.reading-progress {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: #FFFFFF;
  border-top: 1px solid #E8E4DE;
  padding: 8px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  z-index: 90;
}

.reading-progress-bar {
  flex: 1;
  height: 4px;
  background-color: #E8E4DE;
  border-radius: 2px;
  overflow: hidden;
  position: relative;
}

.reading-progress-bar::after {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background-color: #E07A5F;
  border-radius: 2px;
  transition: width 0.1s ease;
}

.reading-progress-clear {
  font-size: 13px;
  color: #6B7280;
  padding: 4px 12px;
  border: 1px solid #E8E4DE;
  border-radius: 4px;
  background-color: #FFFFFF;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.reading-progress-clear:hover {
  color: #E07A5F;
  border-color: #E07A5F;
}

/* ---------- faq ---------- */

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

.layout-side {
  min-width: 0;
}

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

.faq-section h2 {
  font-size: 20px;
  color: #1B3A5C;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #E8E4DE;
}

.faq-list {
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  background-color: #FFFFFF;
  overflow: hidden;
}

.faq-item {
  border-bottom: 1px solid #E8E4DE;
}

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

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  color: #1B3A5C;
  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: #6B7280;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

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

.faq-item summary:hover {
  background-color: #F7F5F2;
}

.faq-answer {
  padding: 0 20px 16px;
  font-size: 14px;
  color: #6B7280;
  line-height: 1.7;
}

.side-card {
  background-color: #FFFFFF;
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 24px;
}

.side-card h2 {
  font-size: 18px;
  color: #1B3A5C;
  margin-bottom: 12px;
}

.side-card p {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.7;
  margin-bottom: 16px;
}

.side-links li {
  margin-bottom: 10px;
}

.side-links li a {
  font-size: 14px;
  color: #1B3A5C;
  font-weight: 500;
  display: inline-block;
  padding-left: 16px;
  position: relative;
}

.side-links li a::before {
  content: '›';
  position: absolute;
  left: 0;
  top: 0;
  color: #E07A5F;
  font-weight: 700;
}

.side-links li a:hover {
  color: #E07A5F;
}

.side-figure {
  background-color: #FFFFFF;
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  overflow: hidden;
}

.side-figure img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.side-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: #6B7280;
  background-color: #F7F5F2;
  text-align: center;
}

/* ---------- boundaries ---------- */

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

.boundary-section {
  background-color: #FFFFFF;
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  padding: 32px;
  margin-bottom: 24px;
}

.boundary-section h2 {
  font-size: 22px;
  color: #1B3A5C;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid #E8E4DE;
}

.content-media {
  margin-bottom: 20px;
}

.content-media img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: 6px;
}

.content-media figcaption {
  font-size: 13px;
  color: #6B7280;
  padding: 8px 4px;
  text-align: center;
}

.content-media-inline {
  max-width: 720px;
}

.section-body p {
  font-size: 15px;
  color: #4B5563;
  line-height: 1.8;
  margin-bottom: 16px;
}

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

.scope-list li {
  font-size: 15px;
  color: #4B5563;
  line-height: 1.7;
  padding-left: 24px;
  position: relative;
  margin-bottom: 12px;
}

.scope-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  top: 0;
  color: #1B3A5C;
  font-weight: 700;
}

.not-provided-list li {
  font-size: 15px;
  color: #4B5563;
  line-height: 1.7;
  padding-left: 24px;
  position: relative;
  margin-bottom: 12px;
}

.not-provided-list li::before {
  content: '×';
  position: absolute;
  left: 0;
  top: 0;
  color: #E07A5F;
  font-weight: 700;
}

.back-entry {
  background-color: #F7F5F2;
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  padding: 24px;
  text-align: center;
  margin-top: 32px;
}

.back-entry p {
  font-size: 14px;
  color: #6B7280;
  line-height: 1.7;
  margin-bottom: 8px;
}

.back-entry p:last-child {
  margin-bottom: 0;
}

.back-entry a {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  color: #E07A5F;
  padding: 8px 24px;
  border: 1px solid #E07A5F;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.back-entry a:hover {
  background-color: #E07A5F;
  color: #FFFFFF;
}

.sidebar-card {
  background-color: #FFFFFF;
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 24px;
}

.sidebar-card h2 {
  font-size: 18px;
  color: #1B3A5C;
  margin-bottom: 16px;
}

.sidebar-links li {
  margin-bottom: 10px;
}

.sidebar-links li a {
  font-size: 14px;
  color: #1B3A5C;
  font-weight: 500;
  display: inline-block;
  padding-left: 16px;
  position: relative;
}

.sidebar-links li a::before {
  content: '›';
  position: absolute;
  left: 0;
  top: 0;
  color: #E07A5F;
  font-weight: 700;
}

.sidebar-links li a:hover {
  color: #E07A5F;
}

.sidebar-note {
  background-color: #F7F5F2;
  border: 1px solid #E8E4DE;
  border-radius: 8px;
  padding: 16px;
}

.sidebar-note p {
  font-size: 13px;
  color: #6B7280;
  line-height: 1.7;
}

/* ---------- 404 ---------- */

.error-main {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 64px 24px;
}

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

.error-content h1 {
  font-size: 48px;
  color: #1B3A5C;
  margin-bottom: 16px;
}

.error-content p {
  font-size: 16px;
  color: #6B7280;
  margin-bottom: 12px;
  line-height: 1.7;
}

.error-back {
  display: inline-block;
  margin-top: 16px;
  padding: 12px 32px;
  background-color: #1B3A5C;
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 600;
  border-radius: 6px;
  transition: background-color 0.2s ease;
}

.error-back:hover {
  background-color: #142B44;
  color: #FFFFFF;
}

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

@media (min-width: 769px) {
  .brand-tagline {
    display: inline;
  }
}

@media (max-width: 1024px) {
  .channel-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .site-index-list {
    grid-template-columns: repeat(3, 1fr);
  }

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

@media (max-width: 768px) {
  .header-inner {
    height: 64px;
    padding: 0 16px;
  }

  .brand-tagline {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background-color: #FFFFFF;
    border-bottom: 1px solid #E8E4DE;
    margin-left: 0;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
    gap: 0;
  }

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

  .nav-list li a {
    padding: 14px 16px;
    font-size: 16px;
    border-radius: 6px;
  }

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

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

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

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

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

  .footer-bottom {
    padding: 16px;
  }

  /* 首页 */
  .hero-content {
    padding: 56px 16px;
  }

  .hero-content h1 {
    font-size: 28px;
  }

  .hero-slogan {
    font-size: 18px;
  }

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

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

  .btn {
    width: 100%;
    text-align: center;
  }

  .directory-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    padding: 16px;
  }

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

  .home-aside {
    order: 2;
  }

  .specials-featured .section-heading {
    padding: 32px 16px 16px;
  }

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

  .site-index {
    padding: 32px 16px;
  }

  .site-index-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }

  /* 频道页 */
  .channel-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .related-links {
    gap: 8px;
  }

  /* 专题页 */
  .special-list .special-card {
    grid-template-columns: 1fr;
  }

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

  .special-body {
    padding: 16px;
  }

  .specials-page .index-list {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .specials-page .site-index {
    padding: 32px 0 0;
  }

  /* 指引页 */
  .section-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  .reading-progress {
    padding: 8px 16px;
  }

  /* FAQ 页 */
  .faq-section h2 {
    font-size: 18px;
  }

  .faq-item summary {
    padding: 14px 16px;
    font-size: 14px;
  }

  .faq-answer {
    padding: 0 16px 14px;
    font-size: 14px;
  }

  /* 边界页 */
  .boundary-section {
    padding: 20px;
  }

  .boundary-section h2 {
    font-size: 20px;
  }

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

  .back-entry {
    padding: 16px;
  }

  /* 404 */
  .error-content h1 {
    font-size: 36px;
  }
}

@media (max-width: 480px) {
  .directory-list {
    grid-template-columns: 1fr;
  }

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

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

  .hero-content h1 {
    font-size: 24px;
  }

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

  .hero-lead {
    font-size: 14px;
  }

  .page-title {
    font-size: 22px;
  }

  .page-description {
    font-size: 14px;
  }

  .channel-card h3 {
    font-size: 16px;
  }

  .special-card h3 {
    font-size: 16px;
  }

  .special-body h3 {
    font-size: 18px;
  }

  .step-item {
    gap: 12px;
  }

  .step-number {
    width: 28px;
    height: 28px;
    font-size: 14px;
  }

  .boundary-section {
    padding: 16px;
  }

  .scope-list li,
  .not-provided-list li {
    font-size: 14px;
  }
}