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

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

html {
  font-size: 16px;
  line-height: 1.75;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: #3d4a59;
  background-color: #f5f9fa;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

a {
  color: #1b6c8a;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #2f9e8f;
}

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

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

/* ==========================================================================
   layout
   ========================================================================== */

.site-header {
  background-color: #ffffff;
  border-bottom: 1px solid #e8f0f1;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

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

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: #2f9e8f;
  line-height: 1.3;
}

.brand-slogan {
  font-size: 13px;
  color: #7a8b96;
  line-height: 1.4;
}

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

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

.nav-list li a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: #3d4a59;
  border-radius: 6px;
  line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-list li a:hover {
  background-color: #e8f0f1;
  color: #1b6c8a;
}

.nav-list li a.is-current {
  background-color: #2f9e8f;
  color: #ffffff;
  font-weight: 600;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  background-color: #e8f0f1;
}

.nav-toggle-icon {
  position: relative;
  width: 20px;
  height: 2px;
  background-color: #3d4a59;
  border-radius: 2px;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background-color: #3d4a59;
  border-radius: 2px;
}

.nav-toggle-icon::before {
  top: -7px;
}

.nav-toggle-icon::after {
  top: 7px;
}

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

.site-footer {
  background-color: #ffffff;
  border-top: 1px solid #e8f0f1;
  margin-top: 64px;
}

.footer-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 24px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 32px;
}

.footer-brand .brand {
  margin-bottom: 12px;
}

.footer-brand p {
  font-size: 14px;
  color: #7a8b96;
  line-height: 1.7;
}

.footer-links h3 {
  font-size: 15px;
  font-weight: 600;
  color: #3d4a59;
  margin-bottom: 12px;
}

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

.footer-links ul li a {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.6;
}

.footer-links ul li a:hover {
  color: #2f9e8f;
}

.footer-bottom {
  border-top: 1px solid #e8f0f1;
  padding: 16px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: #7a8b96;
  max-width: 1200px;
  margin: 0 auto;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 6px;
  line-height: 1.5;
  min-height: 44px;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn-primary {
  background-color: #2f9e8f;
  color: #ffffff;
  border: 1px solid #2f9e8f;
}

.btn-primary:hover {
  background-color: #27877a;
  border-color: #27877a;
  color: #ffffff;
}

.btn-secondary {
  background-color: #ffffff;
  color: #1b6c8a;
  border: 1px solid #1b6c8a;
}

.btn-secondary:hover {
  background-color: #e8f0f1;
  color: #1b6c8a;
}

.tag {
  display: inline-block;
  padding: 2px 10px;
  font-size: 12px;
  line-height: 1.6;
  color: #1b6c8a;
  background-color: #e8f0f1;
  border-radius: 4px;
}

.section-desc {
  font-size: 15px;
  color: #5b6b78;
  line-height: 1.7;
}

.section-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  color: #1b6c8a;
  padding: 8px 0;
  line-height: 1.5;
}

.section-link:hover {
  color: #2f9e8f;
}

.text-link {
  font-size: 14px;
  font-weight: 600;
  color: #ffffff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.6);
  padding-bottom: 2px;
}

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

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

/* breadcrumb */

.breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px 0;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: #7a8b96;
}

.breadcrumb a {
  color: #1b6c8a;
}

.breadcrumb a:hover {
  color: #2f9e8f;
}

.breadcrumb-sep {
  color: #b8c4ca;
}

.breadcrumb-current {
  color: #3d4a59;
}

/* page header */

.page-header {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 24px 28px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
}

.page-description {
  margin-top: 8px;
  font-size: 16px;
  color: #5b6b78;
  line-height: 1.7;
  max-width: 720px;
}

/* inner page main */

.inner-main {
  width: 100%;
}

/* sidebar-left container */

.sidebar-left .page-layout,
.sidebar-left.layout-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
  align-items: start;
}

/* related links */

.related-links {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 20px;
}

.related-links-label {
  font-size: 14px;
  color: #7a8b96;
}

.related-links-item {
  font-size: 14px;
  color: #1b6c8a;
  padding: 6px 14px;
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 6px;
  line-height: 1.5;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.related-links-item:hover {
  border-color: #2f9e8f;
  color: #2f9e8f;
}

/* content media */

.content-media {
  margin: 24px 0;
}

.content-media img {
  border-radius: 8px;
}

.content-media figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: #7a8b96;
  line-height: 1.6;
}

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

/* ==========================================================================
   pages - index
   ========================================================================== */

.home-main {
  width: 100%;
}

/* hero */

.hero-panel {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 40px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-copy h1 {
  font-size: 32px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 16px;
}

.hero-copy p {
  font-size: 16px;
  color: #5b6b78;
  line-height: 1.8;
  margin-bottom: 24px;
  max-width: 560px;
}

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

.hero-visual figure {
  margin: 0;
}

.hero-visual img {
  width: 100%;
  height: auto;
  border-radius: 8px;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

/* genre section */

.genre-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
}

.genre-section h2 {
  font-size: 24px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 8px;
}

.genre-section .section-desc {
  margin-bottom: 24px;
}

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

.genre-card {
  display: block;
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  padding: 20px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.genre-card:hover {
  border-color: #2f9e8f;
  box-shadow: 0 4px 12px rgba(47, 158, 143, 0.1);
}

.genre-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: #3d4a59;
  margin-bottom: 6px;
  line-height: 1.4;
}

.genre-card p {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.7;
  margin-bottom: 12px;
}

.genre-link {
  font-size: 14px;
  font-weight: 600;
  color: #1b6c8a;
  line-height: 1.5;
}

.genre-card:hover .genre-link {
  color: #2f9e8f;
}

/* updates section */

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

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.section-header h2 {
  font-size: 24px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
}

.update-rhythm {
  font-size: 14px;
  color: #7a8b96;
  line-height: 1.6;
}

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

.update-card {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.update-card:hover {
  border-color: #2f9e8f;
  box-shadow: 0 4px 12px rgba(47, 158, 143, 0.1);
}

.update-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.update-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: #3d4a59;
  padding: 14px 16px 6px;
  line-height: 1.5;
}

.update-card .tag {
  margin: 0 16px;
}

.update-card time {
  display: block;
  padding: 8px 16px 14px;
  font-size: 13px;
  color: #7a8b96;
  line-height: 1.5;
}

/* ranking section */

.ranking-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
}

.ranking-section h2 {
  font-size: 24px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 8px;
}

.ranking-section .section-desc {
  margin-bottom: 24px;
}

.ranking-list {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  padding: 8px 0;
}

.ranking-list li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 14px 20px;
  border-bottom: 1px solid #e8f0f1;
}

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

.rank-num {
  font-size: 20px;
  font-weight: 700;
  color: #2f9e8f;
  line-height: 1.4;
  flex-shrink: 0;
  min-width: 32px;
}

.rank-info h3 {
  font-size: 16px;
  font-weight: 600;
  color: #3d4a59;
  line-height: 1.5;
  margin-bottom: 4px;
}

.rank-info .tag {
  margin-bottom: 6px;
}

.rank-info p {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.6;
}

/* tips section */

.tips-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.tip-item {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  padding: 20px;
}

.tip-icon {
  display: inline-block;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: #e8f0f1;
  color: #2f9e8f;
  font-size: 16px;
  font-weight: 700;
  text-align: center;
  line-height: 32px;
  margin-bottom: 10px;
}

.tip-item p {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.7;
}

.tip-item p a {
  font-weight: 600;
}

/* notice bar */

.notice-bar {
  background-color: #1b6c8a;
  padding: 24px;
}

.notice-bar p {
  max-width: 1200px;
  margin: 0 auto;
  font-size: 15px;
  color: #ffffff;
  line-height: 1.7;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

/* ==========================================================================
   pages - comics
   ========================================================================== */

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

.category-aside {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  padding: 24px;
}

.category-aside h2 {
  font-size: 18px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 16px;
}

.category-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.category-list li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  font-size: 15px;
  color: #3d4a59;
  border-radius: 6px;
  line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.category-list li a:hover {
  background-color: #e8f0f1;
  color: #1b6c8a;
}

.category-list li a span {
  font-size: 13px;
  color: #7a8b96;
}

.aside-note {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid #e8f0f1;
  font-size: 13px;
  color: #7a8b96;
  line-height: 1.6;
}

.aside-link {
  display: inline-block;
  margin-top: 12px;
  font-size: 14px;
  font-weight: 600;
  color: #1b6c8a;
  line-height: 1.5;
}

.aside-link:hover {
  color: #2f9e8f;
}

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

.genre-block {
  margin-bottom: 40px;
}

.genre-head {
  margin-bottom: 16px;
}

.genre-head h2 {
  font-size: 22px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 4px;
}

.genre-head p {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.7;
}

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

.comic-card {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.comic-card:hover {
  border-color: #2f9e8f;
  box-shadow: 0 4px 12px rgba(47, 158, 143, 0.1);
}

.comic-cover {
  width: 100%;
  aspect-ratio: 3 / 4;
  background-color: #e8f0f1;
}

.comic-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.comic-name {
  font-size: 15px;
  font-weight: 600;
  color: #3d4a59;
  padding: 12px 14px 4px;
  line-height: 1.5;
}

.comic-tag {
  font-size: 12px;
  color: #1b6c8a;
  padding: 0 14px;
  line-height: 1.6;
}

.comic-desc {
  font-size: 13px;
  color: #7a8b96;
  padding: 6px 14px 14px;
  line-height: 1.6;
}

.catalog-note {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  padding: 24px;
  margin-top: 8px;
}

.catalog-note h2 {
  font-size: 18px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 12px;
}

.catalog-note p {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.7;
  margin-bottom: 8px;
}

.catalog-note p a {
  font-weight: 600;
}

/* ==========================================================================
   pages - updates
   ========================================================================== */

.updates-section .section-intro {
  font-size: 15px;
  color: #5b6b78;
  line-height: 1.7;
  margin-bottom: 20px;
}

.updates-table-wrap {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  overflow-x: auto;
}

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

.updates-table thead th {
  background-color: #e8f0f1;
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 600;
  color: #3d4a59;
  text-align: left;
  line-height: 1.5;
  white-space: nowrap;
}

.updates-table tbody td {
  padding: 12px 16px;
  font-size: 14px;
  color: #5b6b78;
  border-bottom: 1px solid #e8f0f1;
  line-height: 1.6;
}

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

.update-media {
  margin: 24px 0 0;
}

.update-media img {
  width: 100%;
  border-radius: 8px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.update-media figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: #7a8b96;
  line-height: 1.6;
}

.update-method-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 0;
}

.update-method-section h2 {
  font-size: 24px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 20px;
}

.method-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}

.method-card {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  padding: 20px;
}

.method-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: #3d4a59;
  line-height: 1.5;
  margin-bottom: 8px;
}

.method-card p {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.7;
}

.boundary-note {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  padding: 20px;
}

.boundary-note h3 {
  font-size: 16px;
  font-weight: 600;
  color: #3d4a59;
  line-height: 1.5;
  margin-bottom: 8px;
}

.boundary-note p {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.7;
  margin-bottom: 6px;
}

.update-media-note {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 0;
}

.update-media-note h2 {
  font-size: 24px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 20px;
}

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

.note-figure {
  margin: 0;
}

.note-figure img {
  width: 100%;
  border-radius: 8px;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.note-figure figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: #7a8b96;
  line-height: 1.6;
}

.note-text p {
  font-size: 15px;
  color: #5b6b78;
  line-height: 1.8;
  margin-bottom: 12px;
}

.note-text p a {
  font-weight: 600;
}

/* ==========================================================================
   pages - guide
   ========================================================================== */

.guide-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 40px;
}

.section-heading h2 {
  font-size: 24px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 8px;
}

.section-heading p {
  font-size: 15px;
  color: #5b6b78;
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 720px;
}

.org-diagram {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}

.org-figure {
  margin: 0;
}

.org-figure img {
  width: 100%;
  border-radius: 8px;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.org-figure figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: #7a8b96;
  line-height: 1.6;
}

.org-text p {
  font-size: 15px;
  color: #5b6b78;
  line-height: 1.8;
  margin-bottom: 12px;
}

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

.step-card {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  padding: 20px;
}

.guide-section .step-number {
  display: inline-block;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: #2f9e8f;
  color: #ffffff;
  font-size: 16px;
  font-weight: 700;
  text-align: center;
  line-height: 36px;
  margin-bottom: 10px;
}

.step-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: #3d4a59;
  line-height: 1.5;
  margin-bottom: 8px;
}

.step-card p {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.7;
}

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

.bounds-block {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  padding: 20px;
}

.bounds-block h3 {
  font-size: 16px;
  font-weight: 600;
  color: #3d4a59;
  line-height: 1.5;
  margin-bottom: 8px;
}

.bounds-block p {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.7;
  margin-bottom: 8px;
}

/* ==========================================================================
   pages - faq
   ========================================================================== */

.faq-topic-sidebar {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  padding: 24px;
}

.sidebar-title {
  font-size: 18px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 16px;
}

.topic-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.topic-list li a {
  display: block;
  padding: 10px 12px;
  font-size: 15px;
  color: #3d4a59;
  border-radius: 6px;
  line-height: 1.5;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.topic-list li a:hover {
  background-color: #e8f0f1;
  color: #1b6c8a;
}

.topic-note {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid #e8f0f1;
}

.topic-note p {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.7;
  margin-bottom: 8px;
}

.topic-note p a {
  font-weight: 600;
}

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

.faq-group {
  margin-bottom: 32px;
}

.faq-group-title {
  font-size: 20px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 12px;
}

.faq-item {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 600;
  color: #3d4a59;
  cursor: pointer;
  line-height: 1.6;
  list-style: none;
  position: relative;
  padding-right: 44px;
  transition: background-color 0.2s ease;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: #2f9e8f;
  line-height: 1;
}

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

.faq-item summary:hover {
  background-color: #f5f9fa;
}

.faq-answer {
  padding: 0 20px 16px;
  border-top: 1px solid #e8f0f1;
}

.faq-answer p {
  padding-top: 12px;
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.8;
}

.faq-more-help {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  padding: 20px;
}

.faq-more-help p {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.7;
}

.faq-more-help p a {
  font-weight: 600;
}

/* ==========================================================================
   pages - about
   ========================================================================== */

.about-intro {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 40px;
}

.about-intro h2 {
  font-size: 24px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 16px;
}

.about-intro p {
  font-size: 15px;
  color: #5b6b78;
  line-height: 1.8;
  margin-bottom: 12px;
  max-width: 720px;
}

.about-boundary {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 40px;
}

.about-boundary h2 {
  font-size: 24px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 8px;
}

.about-boundary > p {
  font-size: 15px;
  color: #5b6b78;
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 720px;
}

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

.boundary-list li {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  padding: 16px 20px;
}

.boundary-list li h3 {
  font-size: 15px;
  font-weight: 600;
  color: #3d4a59;
  line-height: 1.5;
  margin-bottom: 6px;
}

.boundary-list li p {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.7;
}

.about-update {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 40px;
}

.about-update h2 {
  font-size: 24px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 8px;
}

.about-update > p {
  font-size: 15px;
  color: #5b6b78;
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 720px;
}

.update-methods {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.update-method-item {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  padding: 20px;
}

.update-method-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: #3d4a59;
  line-height: 1.5;
  margin-bottom: 8px;
}

.update-method-item p {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.7;
}

.about-update > p a {
  font-weight: 600;
}

/* ==========================================================================
   pages - feedback
   ========================================================================== */

.feedback-intro {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 40px;
}

.feedback-intro h2 {
  font-size: 24px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 12px;
}

.feedback-intro p {
  font-size: 15px;
  color: #5b6b78;
  line-height: 1.8;
  margin-bottom: 12px;
  max-width: 720px;
}

.feedback-illustration {
  margin: 24px 0 0;
}

.feedback-illustration img {
  width: 100%;
  border-radius: 8px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.feedback-illustration figcaption {
  margin-top: 8px;
  font-size: 13px;
  color: #7a8b96;
  line-height: 1.6;
}

.feedback-process {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 40px;
}

.feedback-process h2 {
  font-size: 24px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 8px;
}

.process-note {
  font-size: 15px;
  color: #5b6b78;
  line-height: 1.7;
  margin-bottom: 20px;
  max-width: 720px;
}

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

.process-step {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  padding: 20px;
}

.feedback-process .step-number {
  display: inline-block;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: #2f9e8f;
  color: #ffffff;
  font-size: 16px;
  font-weight: 700;
  text-align: center;
  line-height: 36px;
  margin-bottom: 10px;
}

.process-step h3 {
  font-size: 16px;
  font-weight: 600;
  color: #3d4a59;
  line-height: 1.5;
  margin-bottom: 8px;
}

.process-step p {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.7;
}

.feedback-boundary {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 40px;
}

.feedback-boundary h2 {
  font-size: 24px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 12px;
}

.feedback-boundary > p {
  font-size: 15px;
  color: #5b6b78;
  line-height: 1.7;
  margin-bottom: 16px;
  max-width: 720px;
}

.feedback-boundary .boundary-list {
  margin-bottom: 16px;
}

.feedback-boundary .boundary-list li {
  padding: 14px 20px;
}

.boundary-tip {
  font-size: 14px;
  color: #5b6b78;
  line-height: 1.7;
}

.boundary-tip a {
  font-weight: 600;
}

/* ==========================================================================
   pages - 404
   ========================================================================== */

.error-main {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-section {
  max-width: 640px;
  margin: 0 auto;
  padding: 80px 24px;
  text-align: center;
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: #2f9e8f;
  line-height: 1.2;
  margin-bottom: 8px;
}

.error-section h1 {
  font-size: 28px;
  font-weight: 700;
  color: #3d4a59;
  line-height: 1.4;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: #5b6b78;
  line-height: 1.7;
  margin-bottom: 24px;
}

.error-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 32px;
}

.error-help {
  background-color: #ffffff;
  border: 1px solid #e8f0f1;
  border-radius: 8px;
  padding: 20px;
  text-align: left;
}

.error-help p {
  font-size: 15px;
  font-weight: 600;
  color: #3d4a59;
  line-height: 1.6;
  margin-bottom: 12px;
}

.error-help ul li {
  margin-bottom: 8px;
}

.error-help ul li a {
  font-size: 14px;
  color: #1b6c8a;
  line-height: 1.6;
}

.error-help ul li a:hover {
  color: #2f9e8f;
}

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

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

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

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

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

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

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

@media (max-width: 768px) {
  .header-inner {
    min-height: 60px;
    padding: 0 16px;
    gap: 12px;
  }

  .brand-slogan {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: #ffffff;
    border-bottom: 1px solid #e8f0f1;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 8px 16px 16px;
    gap: 2px;
  }

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

  .nav-list li a {
    padding: 12px 14px;
    font-size: 16px;
    border-radius: 6px;
  }

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

  .hero-copy h1 {
    font-size: 26px;
  }

  .genre-section,
  .updates-section,
  .ranking-section,
  .tips-section {
    padding: 32px 16px;
  }

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

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

  .tips-section {
    grid-template-columns: 1fr;
  }

  .notice-bar {
    padding: 20px 16px;
  }

  .notice-bar p {
    flex-direction: column;
    align-items: flex-start;
  }

  .breadcrumb {
    padding: 12px 16px 0;
  }

  .page-header {
    padding: 16px 16px 20px;
  }

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

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

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

  .category-aside {
    padding: 16px;
  }

  .category-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .category-list li a {
    padding: 8px 12px;
    font-size: 14px;
    background-color: #e8f0f1;
    border-radius: 6px;
  }

  .category-list li a span {
    display: none;
  }

  .aside-note {
    margin-top: 12px;
    padding-top: 12px;
  }

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

  .genre-block {
    margin-bottom: 32px;
  }

  .update-method-section {
    padding: 32px 16px 0;
  }

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

  .update-media-note {
    padding: 32px 16px 0;
  }

  .media-note-layout {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .guide-section {
    padding: 0 16px 32px;
  }

  .org-diagram {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

  .bounds-wrap {
    grid-template-columns: 1fr;
  }

  .faq-topic-sidebar {
    padding: 16px;
  }

  .topic-list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

  .topic-list li a {
    padding: 8px 12px;
    font-size: 14px;
    background-color: #e8f0f1;
    border-radius: 6px;
  }

  .about-intro,
  .about-boundary,
  .about-update,
  .feedback-intro,
  .feedback-process,
  .feedback-boundary {
    padding: 0 16px 32px;
  }

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

  .update-methods {
    grid-template-columns: 1fr;
  }

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

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

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

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

  .footer-bottom {
    padding: 12px 16px;
  }

  .related-links {
    padding: 24px 16px;
  }
}

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .ranking-list li {
    gap: 12px;
    padding: 12px 16px;
  }

  .rank-num {
    font-size: 18px;
    min-width: 26px;
  }

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

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