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

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #1F2937;
  background-color: #FDF6EC;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: #3B82F6;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #2563EB;
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: 1.4;
  color: #1F2937;
}

h1 {
  font-size: 36px;
  line-height: 1.3;
}

h2 {
  font-size: 28px;
  line-height: 1.4;
}

h3 {
  font-size: 20px;
  line-height: 1.5;
}

p {
  margin-bottom: 12px;
}

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

:focus-visible {
  outline: 2px solid #F59E0B;
  outline-offset: 2px;
}

/* ==========================================================================
   Layout
   ========================================================================== */

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

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

/* ==========================================================================
   Header / Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: #FFFFFF;
  box-shadow: 0 1px 4px rgba(31, 41, 55, 0.08);
}

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

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: #1F2937;
  letter-spacing: 0.02em;
}

.brand:hover .brand-name {
  color: #F59E0B;
}

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

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

.nav-list li {
  position: relative;
}

.nav-link {
  display: inline-block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 500;
  color: #1F2937;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-link:hover {
  background-color: #FDF6EC;
  color: #F59E0B;
}

.nav-link.is-current {
  color: #F59E0B;
  font-weight: 600;
}

.nav-link.is-current::after {
  content: '';
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  background-color: #F59E0B;
  border-radius: 1px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 5px;
  padding: 8px;
  border-radius: 6px;
  background-color: transparent;
  transition: background-color 0.2s ease;
}

.nav-toggle:hover {
  background-color: #FDF6EC;
}

.toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: #1F2937;
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background-color: #1F2937;
  color: #D1D5DB;
  margin-top: 64px;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.footer-title {
  font-size: 16px;
  color: #FFFFFF;
  margin-bottom: 16px;
}

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

.footer-links a {
  font-size: 14px;
  color: #9CA3AF;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #F59E0B;
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-bottom p {
  font-size: 13px;
  color: #6B7280;
  margin-bottom: 0;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
  text-align: center;
}

.btn-primary {
  background-color: #F59E0B;
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: #D97706;
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.btn-secondary {
  background-color: #FFFFFF;
  color: #1F2937;
  border: 1px solid #E5E7EB;
}

.btn-secondary:hover {
  border-color: #F59E0B;
  color: #F59E0B;
}

.btn-block {
  display: flex;
  width: 100%;
}

/* ==========================================================================
   Breadcrumb
   ========================================================================== */

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

.breadcrumb a {
  color: #3B82F6;
}

.breadcrumb a:hover {
  color: #2563EB;
}

.breadcrumb-sep {
  color: #9CA3AF;
}

.breadcrumb-current {
  color: #1F2937;
  font-weight: 500;
}

/* ==========================================================================
   Page Header (inner pages)
   ========================================================================== */

.inner-main {
  padding: 32px 0 0;
}

.inner-main .container,
.inner-main .page-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.inner-main .page-header {
  margin-bottom: 8px;
}

.inner-main .page-title {
  font-size: 36px;
  line-height: 1.3;
  color: #1F2937;
}

.inner-main .page-title-block,
.inner-main .page-title-area,
.inner-main .page-heading {
  margin-bottom: 32px;
}

.inner-main .page-summary,
.inner-main .page-intro {
  font-size: 16px;
  color: #4B5563;
  max-width: 720px;
}

/* ==========================================================================
   Components: Homepage
   ========================================================================== */

/* Hero Section */
.hero-section {
  background-color: #FFFFFF;
  border-bottom: 1px solid #F3E8D3;
}

.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px 72px;
}

.hero-content h1 {
  font-size: 40px;
  line-height: 1.25;
  margin-bottom: 16px;
}

.hero-desc {
  font-size: 17px;
  color: #4B5563;
  margin-bottom: 28px;
  max-width: 560px;
}

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

.hero-media img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(31, 41, 55, 0.08);
}

/* Positioning Section */
.positioning-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px;
}

.positioning-text {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 40px;
}

.positioning-text h2 {
  margin-bottom: 16px;
}

.positioning-text p {
  font-size: 16px;
  color: #4B5563;
}

.positioning-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}

.point-item {
  background-color: #FFFFFF;
  border-radius: 8px;
  padding: 28px 24px;
  border: 1px solid #F3E8D3;
  transition: box-shadow 0.2s ease;
}

.point-item:hover {
  box-shadow: 0 4px 12px rgba(31, 41, 55, 0.06);
}

.point-item h3 {
  font-size: 18px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.point-item p {
  font-size: 14px;
  color: #6B7280;
  margin-bottom: 0;
}

.positioning-image {
  max-width: 720px;
  margin: 0 auto;
}

.positioning-image img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

/* Service Matrix */
.service-matrix {
  background-color: #FFFFFF;
  border-top: 1px solid #F3E8D3;
  border-bottom: 1px solid #F3E8D3;
  padding: 64px 0;
}

.service-matrix .section-header {
  max-width: 1200px;
  margin: 0 auto 40px;
  padding: 0 24px;
  text-align: center;
}

.section-header h2 {
  margin-bottom: 12px;
}

.section-header p {
  font-size: 16px;
  color: #4B5563;
  max-width: 640px;
  margin: 0 auto;
}

.matrix-list {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.matrix-item {
  display: flex;
  align-items: center;
  gap: 24px;
  background-color: #FDF6EC;
  border-radius: 8px;
  padding: 24px 28px;
  border: 1px solid #F3E8D3;
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.matrix-item:hover {
  background-color: #FFFFFF;
  box-shadow: 0 4px 12px rgba(31, 41, 55, 0.06);
}

.item-index {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  font-size: 18px;
  font-weight: 700;
  color: #F59E0B;
  background-color: #FEF3C7;
  border-radius: 8px;
}

.item-body {
  flex: 1;
  min-width: 0;
}

.item-body h3 {
  font-size: 18px;
  margin-bottom: 4px;
}

.item-body p {
  font-size: 14px;
  color: #6B7280;
  margin-bottom: 0;
}

.item-link {
  flex-shrink: 0;
  font-size: 14px;
  font-weight: 600;
  color: #F59E0B;
  padding: 10px 20px;
  border: 1px solid #F59E0B;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.item-link:hover {
  background-color: #F59E0B;
  color: #FFFFFF;
}

/* Workflow Steps */
.workflow-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px;
}

.workflow-section .section-header {
  text-align: center;
  margin-bottom: 40px;
}

.workflow-section .section-header p {
  max-width: 640px;
  margin: 0 auto;
  color: #4B5563;
}

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

.step-item {
  position: relative;
  background-color: #FFFFFF;
  border-radius: 8px;
  padding: 32px 24px 24px;
  border: 1px solid #F3E8D3;
  text-align: center;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
  background-color: #F59E0B;
  border-radius: 50%;
  margin-bottom: 16px;
}

.step-item h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.step-item p {
  font-size: 14px;
  color: #6B7280;
  margin-bottom: 0;
}

/* Updates Section */
.updates-section {
  background-color: #FFFFFF;
  border-top: 1px solid #F3E8D3;
  border-bottom: 1px solid #F3E8D3;
  padding: 64px 0;
}

.updates-section .section-header {
  max-width: 1200px;
  margin: 0 auto 40px;
  padding: 0 24px;
  text-align: center;
}

.updates-section .section-header p {
  max-width: 640px;
  margin: 0 auto;
  color: #4B5563;
}

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

.update-column {
  background-color: #FDF6EC;
  border-radius: 8px;
  padding: 24px;
  border: 1px solid #F3E8D3;
}

.update-column h3 {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid #F59E0B;
  display: inline-block;
}

.update-list li {
  padding: 12px 0;
  border-bottom: 1px solid #F3E8D3;
}

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

.update-version {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: #F59E0B;
  background-color: #FEF3C7;
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 6px;
}

.update-item h4 {
  font-size: 15px;
  margin-bottom: 4px;
}

.update-item p {
  font-size: 13px;
  color: #6B7280;
  margin-bottom: 0;
}

/* FAQ */
.faq-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 24px;
}

.faq-section .section-header {
  text-align: center;
  margin-bottom: 40px;
}

.faq-section .section-header p {
  max-width: 640px;
  margin: 0 auto;
  color: #4B5563;
}

.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: grid;
  gap: 12px;
}

.faq-item {
  background-color: #FFFFFF;
  border: 1px solid #F3E8D3;
  border-radius: 8px;
  padding: 0;
  overflow: hidden;
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  color: #1F2937;
  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: #F59E0B;
  transition: transform 0.2s ease;
}

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

.faq-item summary:hover {
  background-color: #FDF6EC;
}

.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: #4B5563;
  margin-bottom: 0;
}

/* CTA Section */
.cta-section {
  background-color: #FDF6EC;
  padding: 64px 24px;
  border-top: 1px solid #F3E8D3;
}

.cta-content {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
}

.cta-content h2 {
  margin-bottom: 12px;
}

.cta-content p {
  font-size: 16px;
  color: #4B5563;
  margin-bottom: 24px;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* ==========================================================================
   Components: Inner Pages
   ========================================================================== */

/* Page Layout with Sidebar */
.page-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 32px;
  align-items: start;
}

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

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

.sidebar-card {
  background-color: #FFFFFF;
  border: 1px solid #F3E8D3;
  border-radius: 8px;
  padding: 24px;
}

.sidebar-card h2 {
  font-size: 20px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid #F59E0B;
}

.sidebar-links li {
  margin-bottom: 8px;
}

.sidebar-links a {
  display: block;
  padding: 10px 12px;
  font-size: 14px;
  color: #1F2937;
  background-color: #FDF6EC;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.sidebar-links a:hover {
  background-color: #FEF3C7;
  color: #F59E0B;
}

/* Overview with image */
.benefits-overview,
.process-summary,
.activity-overview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  background-color: #FFFFFF;
  border: 1px solid #F3E8D3;
  border-radius: 8px;
  padding: 32px;
  margin-bottom: 32px;
}

.overview-text h2,
.summary-text h2,
.text-col h2 {
  margin-bottom: 16px;
}

.overview-text p,
.summary-text p,
.text-col p {
  font-size: 15px;
  color: #4B5563;
}

.overview-media img,
.summary-media img,
.media-col img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.overview-media figcaption,
.summary-media figcaption,
.media-col figcaption,
.help-figure figcaption {
  font-size: 13px;
  color: #6B7280;
  text-align: center;
  margin-top: 8px;
}

/* Benefit List */
.benefit-list,
.usage-scenarios,
.notices,
.process-steps,
.preparation-section,
.faq-link-section {
  background-color: #FFFFFF;
  border: 1px solid #F3E8D3;
  border-radius: 8px;
  padding: 32px;
  margin-bottom: 32px;
}

.benefit-list h2,
.usage-scenarios h2,
.notices h2,
.process-steps h2,
.preparation-section h2,
.faq-link-section h2 {
  margin-bottom: 24px;
}

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

.benefit-item {
  background-color: #FDF6EC;
  border-radius: 8px;
  padding: 20px;
  border: 1px solid #F3E8D3;
}

.benefit-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
  color: #1F2937;
}

.benefit-item p {
  font-size: 14px;
  color: #4B5563;
  margin-bottom: 0;
}

/* Usage Scenarios */
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.scenario-card {
  background-color: #FDF6EC;
  border-radius: 8px;
  padding: 20px;
  border: 1px solid #F3E8D3;
}

.scenario-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.scenario-card p {
  font-size: 14px;
  color: #4B5563;
  margin-bottom: 0;
}

/* Notices */
.notice-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 12px;
  font-size: 14px;
  color: #4B5563;
}

.notice-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #F59E0B;
}

/* Timeline */
.timeline-list {
  position: relative;
  padding-left: 32px;
}

.timeline-list::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background-color: #F3E8D3;
}

.timeline-item {
  position: relative;
  padding-bottom: 28px;
}

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

.step-marker {
  position: absolute;
  left: -32px;
  top: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  font-size: 13px;
  font-weight: 700;
  color: #FFFFFF;
  background-color: #F59E0B;
  border-radius: 50%;
  z-index: 1;
}

.step-content h3 {
  font-size: 17px;
  margin-bottom: 4px;
}

.step-content p {
  font-size: 14px;
  color: #4B5563;
  margin-bottom: 0;
}

/* Preparation Check List */
.section-desc {
  font-size: 14px;
  color: #6B7280;
  margin-bottom: 16px;
}

.check-list {
  display: grid;
  gap: 12px;
}

.check-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background-color: #FDF6EC;
  border-radius: 8px;
  padding: 16px;
}

.check-icon {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border: 2px solid #10B981;
  border-radius: 4px;
  margin-top: 2px;
}

.check-icon::after {
  content: '✓';
  font-size: 13px;
  color: #10B981;
  font-weight: 700;
}

.check-text strong {
  display: block;
  font-size: 15px;
  margin-bottom: 2px;
}

.check-text p {
  font-size: 13px;
  color: #6B7280;
  margin-bottom: 0;
}

/* FAQ Link Buttons */
.faq-link-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* Related Links */
.related-links {
  max-width: 1200px;
  margin: 24px auto 0;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.related-links-label {
  font-size: 14px;
  color: #6B7280;
  margin-right: 8px;
}

.related-links-item {
  font-size: 14px;
  color: #3B82F6;
  padding: 8px 12px;
  background-color: #FFFFFF;
  border: 1px solid #F3E8D3;
  border-radius: 6px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.related-links-item:hover {
  border-color: #F59E0B;
  color: #F59E0B;
}

/* Activities Page */
.activity-types,
.participation-guide,
.activity-rules {
  background-color: #FFFFFF;
  border: 1px solid #F3E8D3;
  border-radius: 8px;
  padding: 32px;
  margin-bottom: 32px;
}

.activity-types h2,
.participation-guide h2,
.activity-rules h2 {
  margin-bottom: 8px;
}

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

.activity-card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.activity-card {
  background-color: #FDF6EC;
  border-radius: 8px;
  padding: 24px 20px;
  border: 1px solid #F3E8D3;
  transition: box-shadow 0.2s ease;
}

.activity-card:hover {
  box-shadow: 0 4px 12px rgba(31, 41, 55, 0.06);
}

.activity-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
  color: #1F2937;
}

.activity-card p {
  font-size: 14px;
  color: #4B5563;
  margin-bottom: 0;
}

/* Guide Steps */
.guide-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.guide-steps li {
  background-color: #FDF6EC;
  border-radius: 8px;
  padding: 24px 20px;
  border: 1px solid #F3E8D3;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  font-size: 15px;
  font-weight: 700;
  color: #FFFFFF;
  background-color: #F59E0B;
  border-radius: 50%;
  margin-bottom: 12px;
}

.guide-steps h3 {
  font-size: 16px;
  margin-bottom: 6px;
}

.guide-steps p {
  font-size: 14px;
  color: #4B5563;
  margin-bottom: 0;
}

/* Rules */
.rules-list {
  counter-reset: rule-counter;
  display: grid;
  gap: 12px;
}

.rules-list li {
  counter-increment: rule-counter;
  position: relative;
  padding-left: 36px;
  font-size: 14px;
  color: #4B5563;
  background-color: #FDF6EC;
  border-radius: 8px;
  padding-top: 14px;
  padding-bottom: 14px;
  padding-right: 16px;
}

.rules-list li::before {
  content: counter(rule-counter);
  position: absolute;
  left: 12px;
  top: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  font-size: 12px;
  font-weight: 700;
  color: #F59E0B;
  background-color: #FEF3C7;
  border-radius: 4px;
}

/* Related Pages */
.related-pages {
  background-color: #FFFFFF;
  border: 1px solid #F3E8D3;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 32px;
}

.related-pages h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

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

.related-list a {
  display: block;
  padding: 10px 12px;
  font-size: 14px;
  color: #1F2937;
  background-color: #FDF6EC;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.related-list a:hover {
  background-color: #FEF3C7;
  color: #F59E0B;
}

/* Help Page */
.help-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 32px;
  align-items: start;
  margin-bottom: 32px;
}

.help-sidebar {
  background-color: #FFFFFF;
  border: 1px solid #F3E8D3;
  border-radius: 8px;
  padding: 24px;
  position: sticky;
  top: 96px;
}

.sidebar-title {
  font-size: 20px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid #F59E0B;
}

.help-sidebar .sidebar-links li {
  margin-bottom: 8px;
}

.help-sidebar .sidebar-links a {
  display: block;
  padding: 10px 12px;
  font-size: 14px;
  color: #1F2937;
  background-color: #FDF6EC;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.help-sidebar .sidebar-links a:hover {
  background-color: #FEF3C7;
  color: #F59E0B;
}

.sidebar-note {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid #F3E8D3;
}

.sidebar-note p {
  font-size: 14px;
  color: #6B7280;
  margin-bottom: 12px;
}

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

.content-section {
  background-color: #FFFFFF;
  border: 1px solid #F3E8D3;
  border-radius: 8px;
  padding: 32px;
  margin-bottom: 24px;
  scroll-margin-top: 96px;
}

.content-section h2 {
  font-size: 24px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid #F3E8D3;
}

.help-card {
  background-color: #FDF6EC;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 16px;
}

.help-card:last-child {
  margin-bottom: 0;
}

.help-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.help-card p {
  font-size: 14px;
  color: #4B5563;
  margin-bottom: 0;
}

.help-figure {
  margin-top: 12px;
}

.help-figure img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

/* Update Log */
.update-log-section {
  background-color: #FFFFFF;
  border: 1px solid #F3E8D3;
  border-radius: 8px;
  padding: 32px;
  margin-bottom: 32px;
}

.update-log-section h2 {
  margin-bottom: 8px;
}

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

.update-col {
  background-color: #FDF6EC;
  border-radius: 8px;
  padding: 20px;
  border: 1px solid #F3E8D3;
}

.update-col h3 {
  font-size: 17px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid #F59E0B;
  display: inline-block;
}

.update-col .update-list li {
  padding: 10px 0;
  border-bottom: 1px solid #F3E8D3;
}

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

.version-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: #F59E0B;
  background-color: #FEF3C7;
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 6px;
}

.update-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
  display: block;
}

.update-desc {
  font-size: 13px;
  color: #6B7280;
  line-height: 1.5;
}

/* Help CTA */
.help-cta {
  background-color: #FDF6EC;
  border: 1px solid #F3E8D3;
  border-radius: 8px;
  padding: 32px;
  text-align: center;
  margin-bottom: 32px;
}

.help-cta p {
  font-size: 16px;
  color: #4B5563;
  margin-bottom: 16px;
}

/* Feedback Page */
.page-heading {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 32px;
}

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

.feedback-process-section,
.feedback-content-section {
  background-color: #FFFFFF;
  border: 1px solid #F3E8D3;
  border-radius: 8px;
  padding: 32px;
  margin-bottom: 32px;
}

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

.section-heading p {
  font-size: 14px;
  color: #6B7280;
  margin-bottom: 20px;
}

.process-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
}

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

.process-list {
  display: grid;
  gap: 12px;
}

.process-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  background-color: #FDF6EC;
  border-radius: 8px;
  padding: 14px 16px;
}

.process-list li::before {
  content: '';
  flex-shrink: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #F59E0B;
  margin-top: 8px;
}

.process-list li strong {
  display: block;
  font-size: 15px;
  margin-bottom: 2px;
}

.process-list li span {
  font-size: 13px;
  color: #6B7280;
}

.process-figure img {
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.process-figure figcaption {
  font-size: 13px;
  color: #6B7280;
  text-align: center;
  margin-top: 8px;
}

.content-scope-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.content-scope-list li {
  background-color: #FDF6EC;
  border-radius: 8px;
  padding: 14px 16px;
  font-size: 14px;
  color: #4B5563;
}

/* FAQ Panel */
.faq-panel {
  display: grid;
  gap: 12px;
}

.faq-panel .faq-item {
  background-color: #FFFFFF;
  border: 1px solid #F3E8D3;
  border-radius: 8px;
  overflow: hidden;
}

.faq-panel .faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  color: #1F2937;
  cursor: pointer;
  list-style: none;
}

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

.faq-panel .faq-item summary::after {
  content: '+';
  font-size: 20px;
  color: #F59E0B;
  transition: transform 0.2s ease;
}

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

.faq-panel .faq-item summary:hover {
  background-color: #FDF6EC;
}

.faq-answer {
  padding: 0 20px 16px;
  font-size: 14px;
  color: #4B5563;
}

/* 404 Page */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  flex: 1;
}

.error-panel {
  max-width: 560px;
  text-align: center;
  background-color: #FFFFFF;
  border: 1px solid #F3E8D3;
  border-radius: 8px;
  padding: 48px 40px;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: #F59E0B;
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 28px;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: #4B5563;
  margin-bottom: 24px;
}

.error-panel .btn {
  margin-bottom: 16px;
}

.error-help {
  font-size: 14px;
  color: #6B7280;
}

.error-help a {
  color: #3B82F6;
  margin: 0 6px;
}

.error-help a:hover {
  color: #2563EB;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

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

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

  .updates-columns {
    grid-template-columns: 1fr;
    max-width: 560px;
    margin: 0 auto;
  }

  .update-log-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }
}

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

  .nav-toggle {
    display: flex;
  }

  .main-nav {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background-color: #FFFFFF;
    border-top: 1px solid #F3E8D3;
    box-shadow: 0 4px 12px rgba(31, 41, 55, 0.08);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px;
    gap: 0;
  }

  .nav-list li {
    width: 100%;
  }

  .nav-link {
    display: block;
    padding: 14px 12px;
    border-radius: 6px;
  }

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

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

  .main-nav.is-open {
    max-height: 400px;
  }

  /* Hero */
  .hero-section {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 16px 48px;
  }

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

  .hero-media {
    order: -1;
  }

  /* Positioning */
  .positioning-section {
    padding: 48px 16px;
  }

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

  /* Service Matrix */
  .service-matrix {
    padding: 48px 0;
  }

  .matrix-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 20px;
  }

  .item-link {
    align-self: flex-start;
  }

  /* Workflow */
  .workflow-section {
    padding: 48px 16px;
  }

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

  /* Updates */
  .updates-section {
    padding: 48px 0;
  }

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

  /* FAQ */
  .faq-section {
    padding: 48px 16px;
  }

  /* CTA */
  .cta-section {
    padding: 48px 16px;
  }

  .cta-actions {
    flex-direction: column;
    align-items: center;
  }

  .cta-actions .btn {
    width: 100%;
    max-width: 320px;
  }

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

  .footer-bottom {
    flex-direction: column;
    padding: 16px;
  }

  /* Inner pages */
  .inner-main {
    padding: 24px 0 0;
  }

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

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

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

  .sidebar,
  .sidebar-area {
    order: 2;
  }

  .main-content {
    order: 1;
  }

  /* Overview sections */
  .benefits-overview,
  .process-summary,
  .activity-overview {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 24px;
  }

  .overview-media,
  .summary-media,
  .media-col {
    order: -1;
  }

  /* Benefit grid */
  .benefit-grid {
    grid-template-columns: 1fr;
  }

  .scenario-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .benefit-list,
  .usage-scenarios,
  .notices,
  .process-steps,
  .preparation-section,
  .faq-link-section,
  .activity-types,
  .participation-guide,
  .activity-rules,
  .feedback-process-section,
  .feedback-content-section,
  .update-log-section,
  .content-section {
    padding: 24px 20px;
  }

  /* Timeline */
  .timeline-list {
    padding-left: 28px;
  }

  .step-marker {
    left: -28px;
    width: 22px;
    height: 22px;
    font-size: 12px;
  }

  /* Activity cards */
  .activity-card-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .guide-steps {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* Help layout */
  .help-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .help-sidebar {
    position: static;
    order: 2;
  }

  .help-content {
    order: 1;
  }

  /* Process layout */
  .process-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .process-figure {
    order: -1;
  }

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

  /* Related links */
  .related-links {
    padding: 16px;
  }

  /* 404 */
  .error-panel {
    padding: 32px 24px;
  }

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

@media (max-width: 480px) {
  .brand-name {
    font-size: 18px;
  }

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

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

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

  .faq-link-buttons {
    flex-direction: column;
    align-items: stretch;
  }

  .faq-link-buttons .btn {
    width: 100%;
  }

  .point-item {
    padding: 20px 16px;
  }

  .matrix-item {
    padding: 16px;
  }

  .item-body h3 {
    font-size: 16px;
  }

  .item-body p {
    font-size: 13px;
  }

  .item-link {
    font-size: 13px;
    padding: 8px 16px;
  }

  .step-item {
    padding: 24px 16px;
  }

  .step-item h3 {
    font-size: 16px;
  }

  .step-item p {
    font-size: 13px;
  }

  .update-column {
    padding: 16px;
  }

  .update-item h4 {
    font-size: 14px;
  }

  .update-item p {
    font-size: 12px;
  }

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

  .faq-item p {
    font-size: 13px;
    padding: 0 16px 14px;
  }

  .benefit-item {
    padding: 16px;
  }

  .benefit-item h3 {
    font-size: 15px;
  }

  .benefit-item p {
    font-size: 13px;
  }

  .scenario-card {
    padding: 16px;
  }

  .scenario-card h3 {
    font-size: 15px;
  }

  .scenario-card p {
    font-size: 13px;
  }

  .notice-list li {
    font-size: 13px;
  }

  .step-content h3 {
    font-size: 15px;
  }

  .step-content p {
    font-size: 13px;
  }

  .check-list li {
    padding: 12px;
  }

  .check-text strong {
    font-size: 14px;
  }

  .check-text p {
    font-size: 12px;
  }

  .activity-card {
    padding: 16px;
  }

  .activity-card h3 {
    font-size: 15px;
  }

  .activity-card p {
    font-size: 13px;
  }

  .guide-steps li {
    padding: 16px;
  }

  .guide-steps h3 {
    font-size: 15px;
  }

  .guide-steps p {
    font-size: 13px;
  }

  .rules-list li {
    font-size: 13px;
    padding-left: 32px;
    padding-top: 12px;
    padding-bottom: 12px;
  }

  .rules-list li::before {
    left: 10px;
    top: 12px;
  }

  .help-card {
    padding: 16px;
  }

  .help-card h3 {
    font-size: 15px;
  }

  .help-card p {
    font-size: 13px;
  }

  .sidebar-card {
    padding: 16px;
  }

  .sidebar-card h2 {
    font-size: 18px;
  }

  .sidebar-links a {
    font-size: 13px;
    padding: 10px;
  }

  .related-list a {
    font-size: 13px;
    padding: 10px;
  }

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

  .process-list li {
    padding: 12px;
  }

  .process-list li strong {
    font-size: 14px;
  }

  .process-list li span {
    font-size: 12px;
  }

  .content-scope-list li {
    font-size: 13px;
    padding: 12px;
  }

  .update-col {
    padding: 16px;
  }

  .update-col h3 {
    font-size: 15px;
  }

  .update-title {
    font-size: 14px;
  }

  .update-desc {
    font-size: 12px;
  }

  .version-tag {
    font-size: 11px;
  }

  .error-panel {
    padding: 24px 16px;
  }

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

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

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

  .error-help {
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}