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

:root {
  --color-white: #ffffff;
  --color-bg: #f5f5f5;
  --color-text: #333333;
  --color-primary: #ff6b6b;
  --color-secondary: #4ecdc4;
  --color-text-light: #666666;
  --color-border: #e5e5e5;
  --color-card-bg: #ffffff;
  --radius: 8px;
  --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 20px rgba(0, 0, 0, 0.12);
  --container-width: 1200px;
  --header-height: 64px;
  --transition-base: 0.2s ease;
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  font-weight: 700;
  line-height: 1.3;
}

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

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

.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

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

.brand-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
}

.brand-tagline {
  font-size: 13px;
  color: var(--color-text-light);
  display: none;
}

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

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

.nav-list a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: 6px;
  transition: background-color var(--transition-base), color var(--transition-base);
}

.nav-list a:hover {
  color: var(--color-primary);
  background-color: rgba(255, 107, 107, 0.06);
}

.nav-list a.is-current {
  color: var(--color-primary);
  font-weight: 600;
  background-color: rgba(255, 107, 107, 0.08);
}

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

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.site-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 32px 24px 48px;
}

.home-main {
  padding-top: 0;
}

.inner-main {
  background-color: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 32px 40px 48px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.breadcrumb a {
  color: var(--color-text-light);
}

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

.breadcrumb-sep {
  color: #bbb;
}

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

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

.page-title {
  font-size: 32px;
  color: var(--color-text);
  margin-bottom: 12px;
}

.page-description {
  font-size: 16px;
  color: var(--color-text-light);
  max-width: 720px;
}

.site-footer {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  margin-top: 48px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 24px;
}

.footer-brand {
  margin-bottom: 32px;
}

.footer-brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.footer-slogan {
  font-size: 14px;
  color: var(--color-text-light);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}

.footer-col h3 {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 12px;
}

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

.footer-col a {
  font-size: 14px;
  color: var(--color-text-light);
}

.footer-col a:hover {
  color: var(--color-primary);
}

.footer-copyright {
  padding-top: 24px;
  font-size: 13px;
  color: var(--color-text-light);
  text-align: center;
}

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

/* --- section block (home) --- */

.section-block {
  padding: 48px 0;
  border-bottom: 1px solid var(--color-border);
}

.section-block:last-child {
  border-bottom: none;
}

.section-title {
  font-size: 26px;
  color: var(--color-text);
  margin-bottom: 8px;
}

.section-desc {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 28px;
  max-width: 720px;
}

.more-link {
  margin-top: 24px;
}

.more-link a {
  display: inline-block;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
  padding: 8px 20px;
  border: 1px solid var(--color-primary);
  border-radius: 6px;
  transition: background-color var(--transition-base), color var(--transition-base);
}

.more-link a:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* --- buttons --- */

.btn-primary,
.btn-secondary {
  display: inline-block;
  padding: 12px 28px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 6px;
  transition: background-color var(--transition-base), color var(--transition-base),
    box-shadow var(--transition-base);
}

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

.btn-primary:hover {
  background-color: #e85a5a;
  color: var(--color-white);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: var(--color-white);
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-secondary:hover {
  background-color: rgba(255, 107, 107, 0.06);
  color: var(--color-primary);
}

/* --- cover card --- */

.cover-card {
  background-color: var(--color-card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.cover-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

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

.cover-card figcaption {
  padding: 10px 12px;
  font-size: 14px;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* --- update list (home) --- */

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

.update-group:last-child {
  margin-bottom: 0;
}

.update-date {
  font-size: 18px;
  color: var(--color-text);
  padding-bottom: 10px;
  margin-bottom: 16px;
  border-bottom: 2px solid var(--color-secondary);
  display: inline-block;
}

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

.update-item {
  background-color: var(--color-card-bg);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.update-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.update-item a {
  display: flex;
  gap: 16px;
  padding: 12px;
}

.update-item img {
  width: 80px;
  height: 106px;
  object-fit: cover;
  border-radius: 4px;
  flex-shrink: 0;
}

.update-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-width: 0;
}

.update-info h3 {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.update-meta {
  font-size: 13px;
  color: var(--color-text-light);
}

/* --- rank preview (home) --- */

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

.rank-item {
  display: flex;
  gap: 16px;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  transition: box-shadow var(--transition-base);
}

.rank-item:hover {
  box-shadow: var(--shadow-md);
}

.rank-number {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  flex-shrink: 0;
  min-width: 36px;
}

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

.rank-title {
  font-size: 16px;
  margin-bottom: 6px;
}

.rank-title a {
  color: var(--color-text);
}

.rank-title a:hover {
  color: var(--color-primary);
}

.rank-reason {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* --- guide tips grid (home) --- */

.guide-tips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.guide-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.guide-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

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

.card-title a {
  color: var(--color-text);
}

.card-title a:hover {
  color: var(--color-primary);
}

.guide-card p {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 16px;
  line-height: 1.6;
}

.card-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-primary);
}

.card-link:hover {
  text-decoration: underline;
}

/* --- site notice --- */

.site-notice {
  background-color: rgba(78, 205, 196, 0.06);
  border-radius: var(--radius);
  padding: 28px 32px;
  margin-top: 48px;
}

.site-notice .section-title {
  font-size: 20px;
  margin-bottom: 12px;
}

.site-notice p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  max-width: 800px;
}

/* --- inner page section intro --- */

.section-intro {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 24px;
  max-width: 720px;
}

/* --- sidebar (category page) --- */

.layout-shell.sidebar-left {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 24px;
  align-items: start;
}

.sidebar-left .category-aside {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.sidebar-left .inner-main {
  min-width: 0;
}

.aside-inner {
  background-color: var(--color-white);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  padding: 24px;
}

.aside-inner h2 {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-secondary);
}

.category-index li {
  margin-bottom: 4px;
}

.category-index a {
  display: block;
  padding: 8px 12px;
  font-size: 15px;
  color: var(--color-text);
  border-radius: 6px;
  transition: background-color var(--transition-base), color var(--transition-base);
}

.category-index a:hover {
  color: var(--color-primary);
  background-color: rgba(255, 107, 107, 0.06);
}

.aside-note {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* --- category page --- */

.category-tags,
.category-details,
.category-tip {
  margin-bottom: 40px;
}

.category-tags h2,
.category-details h2,
.category-tip h2 {
  font-size: 22px;
  margin-bottom: 8px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.tag-cloud a {
  display: inline-block;
  padding: 6px 16px;
  font-size: 14px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  color: var(--color-text);
  transition: background-color var(--transition-base), color var(--transition-base),
    border-color var(--transition-base);
}

.tag-cloud a:hover {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

.category-item {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 24px;
  align-items: center;
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.category-text h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.category-text p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

.category-figure {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

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

.category-figure figcaption {
  padding: 8px 12px;
  font-size: 13px;
  color: var(--color-text-light);
  background-color: var(--color-white);
}

.category-tip p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 12px;
}

.category-tip a {
  color: var(--color-primary);
  font-weight: 500;
  margin-right: 16px;
}

.category-tip a:hover {
  text-decoration: underline;
}

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

.guide-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 40px;
  align-items: start;
}

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

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

.guide-section h2 {
  font-size: 22px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-secondary);
  display: inline-block;
}

.guide-section p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 12px;
}

.guide-section p a {
  color: var(--color-primary);
}

.guide-section p a:hover {
  text-decoration: underline;
}

.guide-figure {
  margin: 16px 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.guide-figure img {
  width: 100%;
  max-height: 320px;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 8px 12px;
  font-size: 13px;
  color: var(--color-text-light);
  background-color: var(--color-bg);
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  background-color: var(--color-white);
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 40px;
  transition: background-color var(--transition-base);
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: var(--color-primary);
  transition: transform var(--transition-base);
}

.faq-item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.faq-item[open] summary {
  background-color: rgba(255, 107, 107, 0.04);
}

.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

.guide-links {
  background-color: var(--color-bg);
  border-radius: var(--radius);
  padding: 24px;
}

.guide-links a {
  display: inline-block;
  margin-right: 12px;
  color: var(--color-primary);
  font-weight: 500;
}

.guide-links a:hover {
  text-decoration: underline;
}

.guide-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 24px);
}

.sidebar-card {
  background-color: var(--color-bg);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
}

.sidebar-card h3 {
  font-size: 16px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-card li {
  margin-bottom: 6px;
}

.sidebar-card a {
  font-size: 14px;
  color: var(--color-text-light);
  display: block;
  padding: 4px 0;
}

.sidebar-card a:hover {
  color: var(--color-primary);
}

/* --- recent page --- */

.update-group .section-title {
  font-size: 22px;
  margin-bottom: 8px;
}

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

.update-group .update-item {
  display: flex;
  flex-direction: column;
}

.update-group .update-item a {
  display: flex;
  flex-direction: column;
  padding: 0;
}

.update-cover {
  width: 100%;
  aspect-ratio: 3 / 4;
  overflow: hidden;
}

.update-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.update-item:hover .update-cover img {
  transform: scale(1.03);
}

.update-group .update-info {
  padding: 14px;
}

.update-title {
  font-size: 15px;
  margin-bottom: 6px;
}

.update-link {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  border-top: 1px solid var(--color-border);
  text-align: center;
  transition: background-color var(--transition-base);
}

.update-link:hover {
  background-color: rgba(255, 107, 107, 0.06);
}

.update-note {
  background-color: var(--color-bg);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 40px;
}

.update-note h2 {
  font-size: 18px;
  margin-bottom: 12px;
}

.update-note p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 8px;
}

/* --- rank page --- */

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

.rank-section .section-title {
  font-size: 22px;
  margin-bottom: 8px;
}

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

.rank-card {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.rank-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.rank-card .rank-number {
  display: block;
  padding: 12px 16px 0;
  font-size: 24px;
}

.rank-cover {
  padding: 0 16px;
}

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

.rank-info {
  padding: 14px 16px 16px;
}

.rank-title {
  font-size: 16px;
  margin-bottom: 6px;
}

.rank-meta {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.rank-reason {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* --- tips page --- */

.tips-content-wrap {
  max-width: 800px;
}

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

.tips-section h2 {
  font-size: 22px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-secondary);
  display: inline-block;
}

.tips-section p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 12px;
}

.tips-figure {
  margin: 16px 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.tips-figure img {
  width: 100%;
  max-height: 300px;
  object-fit: cover;
}

.tips-figure figcaption {
  padding: 8px 12px;
  font-size: 13px;
  color: var(--color-text-light);
  background-color: var(--color-bg);
}

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

.error-main {
  max-width: 720px;
  text-align: center;
  padding: 80px 24px;
}

.error-panel {
  background-color: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 48px 32px;
  margin-bottom: 32px;
}

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

.error-panel h1 {
  font-size: 24px;
  margin-bottom: 16px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

.error-btn {
  display: inline-block;
  padding: 12px 32px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 16px;
  font-weight: 600;
  border-radius: 6px;
  transition: background-color var(--transition-base);
}

.error-btn:hover {
  background-color: #e85a5a;
  color: var(--color-white);
}

.error-links {
  text-align: left;
  background-color: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 24px 32px;
}

.error-links h2 {
  font-size: 18px;
  margin-bottom: 16px;
}

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

.error-links a {
  color: var(--color-primary);
}

.error-links a:hover {
  text-decoration: underline;
}

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

/* --- home page --- */

.hero-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 56px 0 48px;
  background-color: var(--color-white);
  border-radius: 0 0 var(--radius) var(--radius);
}

.hero-copy {
  min-width: 0;
}

.hero-copy h1 {
  font-size: 36px;
  color: var(--color-text);
  margin-bottom: 16px;
  line-height: 1.25;
}

.hero-lead {
  font-size: 16px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 24px;
  max-width: 480px;
}

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

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

.hero-cover {
  background-color: var(--color-card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.hero-cover:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

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

.hero-cover figcaption {
  padding: 10px 12px;
  font-size: 14px;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.category-nav-section {
  background-color: var(--color-white);
  margin-top: 24px;
  border-radius: var(--radius);
  padding: 40px;
}

.category-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.category-tag-list a {
  display: inline-block;
  padding: 8px 20px;
  font-size: 15px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  color: var(--color-text);
  transition: background-color var(--transition-base), color var(--transition-base),
    border-color var(--transition-base);
}

.category-tag-list a:hover {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

.recent-updates-section,
.rank-preview-section,
.guide-tips-section {
  background-color: var(--color-white);
  margin-top: 24px;
  border-radius: var(--radius);
  padding: 40px;
}

/* --- inner pages --- */

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

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

@media (max-width: 1024px) {
  .hero-section {
    gap: 32px;
  }

  .hero-copy h1 {
    font-size: 30px;
  }

  .category-item {
    grid-template-columns: 1fr 200px;
  }

  .layout-shell.sidebar-left {
    grid-template-columns: 220px 1fr;
  }
}

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

  .brand-tagline {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    margin-left: 0;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px;
    gap: 4px;
  }

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

  .nav-list a {
    padding: 12px 16px;
    font-size: 16px;
  }

  .site-main {
    padding: 20px 16px 40px;
  }

  .inner-main {
    padding: 24px 20px 32px;
  }

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

  .footer-inner {
    padding: 32px 16px 20px;
  }

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

  .hero-section {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 0 32px;
  }

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

  .hero-cover-wall {
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
  }

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

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

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

  .rank-preview-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .layout-shell.sidebar-left {
    grid-template-columns: 1fr;
    padding: 0 16px;
  }

  .sidebar-left .category-aside {
    position: static;
    order: 2;
  }

  .sidebar-left .site-main {
    order: 1;
  }

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

  .category-figure {
    max-width: 280px;
  }

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

  .guide-sidebar {
    position: static;
  }

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

  .recent-updates-section,
  .rank-preview-section,
  .guide-tips-section,
  .category-nav-section {
    padding: 24px 20px;
  }

  .site-notice {
    padding: 20px;
  }
}

@media (max-width: 480px) {
  .header-inner {
    height: 56px;
  }

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

  .hero-cover-wall {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }

  .hero-cover figcaption {
    font-size: 12px;
    padding: 6px 8px;
  }

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

  .btn-primary,
  .btn-secondary {
    padding: 10px 20px;
    font-size: 15px;
  }

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

  .footer-col h3 {
    font-size: 14px;
  }

  .footer-col a {
    font-size: 13px;
  }

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

  .page-description {
    font-size: 15px;
  }

  .breadcrumb {
    font-size: 13px;
  }

  .update-item a {
    padding: 10px;
  }

  .update-item img {
    width: 70px;
    height: 93px;
  }

  .rank-item {
    padding: 16px;
  }

  .rank-number {
    font-size: 24px;
    min-width: 30px;
  }

  .guide-card {
    padding: 20px;
  }

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

  .error-panel {
    padding: 32px 20px;
  }

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

/* --- scroll animation (progressive enhancement) --- */

@media (prefers-reduced-motion: no-preference) {
  .section-block,
  .category-nav-section,
  .recent-updates-section,
  .rank-preview-section,
  .guide-tips-section,
  .hero-section,
  .inner-main {
    animation: fadeInUp 0.4s ease both;
  }

  .section-block:nth-child(2),
  .hero-section {
    animation-delay: 0.05s;
  }

  .section-block:nth-child(3),
  .category-nav-section {
    animation-delay: 0.1s;
  }

  .section-block:nth-child(4),
  .recent-updates-section {
    animation-delay: 0.15s;
  }

  .section-block:nth-child(5),
  .rank-preview-section {
    animation-delay: 0.2s;
  }

  .section-block:nth-child(6),
  .guide-tips-section {
    animation-delay: 0.25s;
  }

  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}