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

:root {
  --color-bg: #f5f5f5;
  --color-surface: #ffffff;
  --color-primary: #1a1a2e;
  --color-accent: #e94560;
  --color-secondary: #0f3460;
  --color-text: #2d2d3a;
  --color-text-light: #6b6b7b;
  --color-border: #e0e0e6;
  --color-white: #ffffff;
  --font-heading: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --transition-fast: 0.2s ease;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.08);
}

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-primary);
}

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

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

.site-home,
.site-inner {
  flex: 1 0 auto;
}

.site-main {
  width: 100%;
}

.home-main {
  background-color: var(--color-bg);
}

.inner-main {
  background-color: var(--color-bg);
  padding-bottom: 60px;
}

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

/* ---------- header / nav ---------- */

.site-header {
  background-color: var(--color-primary);
  border-bottom: 3px solid var(--color-accent);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

.brand-name {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 1px;
}

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

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

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

.nav-list li a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.85);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-list li a:hover {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.1);
}

.nav-list li a.is-current {
  color: var(--color-white);
  background-color: var(--color-accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
}

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

/* ---------- buttons ---------- */

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

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

.btn-primary:hover {
  background-color: #d63851;
  color: var(--color-white);
}

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

.btn-secondary:hover {
  background-color: #0a2540;
  color: var(--color-white);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

/* ---------- breadcrumb ---------- */

.breadcrumb {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px 20px 0;
  font-size: 14px;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

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

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

.breadcrumb-sep {
  color: var(--color-text-light);
  margin: 0 2px;
}

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

/* ---------- page header ---------- */

.page-header {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 28px 20px 20px;
}

.page-title {
  font-size: 30px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.page-description {
  font-size: 15px;
  color: var(--color-text-light);
  max-width: 720px;
}

/* ---------- section heading ---------- */

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

.section-heading h2,
.section-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.section-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ---------- footer ---------- */

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

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 20px 24px;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 40px;
}

.footer-brand-name {
  display: block;
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 8px;
}

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

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

.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 12px;
}

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

.footer-col ul li a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

.footer-col ul li a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 16px 20px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
  max-width: var(--container-width);
  margin: 0 auto;
}

/* ---------- hero ---------- */

.hero-section {
  background-color: var(--color-primary);
  padding: 60px 0;
}

.hero-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
}

.hero-content h1 {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
  line-height: 1.25;
}

.hero-lead {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 24px;
}

.hero-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-hover);
}

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

/* ---------- home modules ---------- */

.category-nav-section,
.recent-updates-section,
.rank-preview-section,
.guide-entry-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 20px;
}

.category-nav-section {
  padding-top: 40px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-item {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-secondary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.tag-item:hover {
  background-color: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.update-group {
  margin-bottom: 28px;
}

.update-date {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-secondary);
  padding-bottom: 8px;
  margin-bottom: 12px;
  border-bottom: 2px solid var(--color-border);
}

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

.update-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.update-item:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--color-accent);
}

.update-item img {
  width: 64px;
  height: 88px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.update-info {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.item-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

.item-status {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent);
  background-color: rgba(233, 69, 96, 0.1);
  padding: 2px 8px;
  border-radius: 10px;
}

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

.rank-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: box-shadow var(--transition-fast);
}

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

.rank-number {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}

.rank-item img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.rank-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.rank-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.4;
}

.rank-reason {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.link-more {
  display: inline-flex;
  align-items: center;
  margin-top: 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.link-more:hover {
  color: var(--color-secondary);
}

.guide-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.guide-card {
  padding: 24px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: box-shadow var(--transition-fast);
}

.guide-card:hover {
  box-shadow: var(--shadow-hover);
}

.guide-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.guide-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 16px;
}

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

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

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

.page-layout.sidebar-left {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
  align-items: start;
}

.category-aside {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  position: sticky;
  top: 84px;
}

.aside-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-accent);
}

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

.category-aside .tag-list li a {
  display: block;
  padding: 6px 10px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.category-aside .tag-list li a:hover {
  background-color: rgba(233, 69, 96, 0.08);
  color: var(--color-accent);
}

.aside-note {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.5;
}

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

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

.content-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.section-intro {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 20px;
  line-height: 1.6;
}

.tag-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}

.tag-card {
  display: block;
  padding: 14px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.tag-card:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--color-accent);
}

.tag-card h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-secondary);
  margin-bottom: 4px;
}

.tag-card p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.4;
}

.theme-block {
  margin-bottom: 28px;
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.theme-block h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
}

.work-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.work-cover {
  flex-shrink: 0;
  margin: 0;
  width: 96px;
  height: 128px;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

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

.work-info {
  min-width: 0;
}

.work-info h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.work-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
}

.related-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.related-list li a {
  display: block;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--color-secondary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.related-list li a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

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

.guide-hero {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px 32px;
}

.guide-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.guide-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-light);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: none;
}

.guide-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px 40px;
}

.guide-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
}

.guide-section p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-text);
  margin-bottom: 12px;
}

.guide-section p a {
  color: var(--color-accent);
  font-weight: 600;
}

.guide-steps {
  counter-reset: guide-step;
  margin: 16px 0;
}

.guide-steps li {
  counter-increment: guide-step;
  position: relative;
  padding: 16px 16px 16px 56px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 10px;
}

.guide-steps li::before {
  content: counter(guide-step);
  position: absolute;
  left: 14px;
  top: 16px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-white);
  background-color: var(--color-accent);
  border-radius: 50%;
}

.guide-steps li h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.guide-steps li p {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 0;
  line-height: 1.6;
}

.guide-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin: 16px 0;
}

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

.guide-related {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px 40px;
}

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

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.related-links li a {
  display: inline-block;
  padding: 8px 16px;
  font-size: 14px;
  color: var(--color-secondary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.related-links li a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

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

.rank-section,
.rank-reason-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px 40px;
}

.rank-section .rank-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

.rank-section .rank-item {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 20px;
  padding: 16px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  transition: box-shadow var(--transition-fast);
}

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

.rank-section .rank-number {
  font-size: 24px;
  min-width: 44px;
  text-align: center;
}

.rank-cover {
  flex-shrink: 0;
  margin: 0;
  width: 80px;
  height: 108px;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

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

.rank-section .rank-info {
  flex: 1;
  min-width: 0;
}

.rank-section .rank-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.rank-section .rank-reason {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

.reason-card {
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: box-shadow var(--transition-fast);
}

.reason-card:hover {
  box-shadow: var(--shadow-hover);
}

.reason-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.reason-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

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

.tips-hero-figure {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px 32px;
}

.tips-hero-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.tips-hero-figure figcaption {
  padding: 8px 4px;
  font-size: 13px;
  color: var(--color-text-light);
}

.tips-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px 40px;
}

.tips-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
}

.tips-section > p {
  font-size: 15px;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 16px;
}

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

.tips-step-item {
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: box-shadow var(--transition-fast);
}

.tips-step-item:hover {
  box-shadow: var(--shadow-hover);
}

.tips-step-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-secondary);
  margin-bottom: 8px;
}

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

.tips-content-block {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 16px;
}

.tips-content-item {
  padding: 20px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: box-shadow var(--transition-fast);
}

.tips-content-item:hover {
  box-shadow: var(--shadow-hover);
}

.tips-content-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-secondary);
  margin-bottom: 8px;
}

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

.tips-related {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px 40px;
}

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

.tips-related p {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tips-related p a {
  display: inline-block;
  padding: 8px 16px;
  font-size: 14px;
  color: var(--color-secondary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.tips-related p a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

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

.error-main {
  background-color: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  flex: 1 0 auto;
}

.error-content {
  text-align: center;
  max-width: 480px;
  padding: 40px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.error-code {
  font-family: var(--font-heading);
  font-size: 64px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  display: block;
  margin-bottom: 12px;
}

.error-content h1 {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 20px;
}

.error-back {
  display: inline-flex;
  align-items: center;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  background-color: var(--color-accent);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.error-back:hover {
  background-color: #d63851;
  color: var(--color-white);
}

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

@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

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

  .tag-grid {
    grid-template-columns: repeat(4, 1fr);
  }

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

  .page-layout.sidebar-left {
    grid-template-columns: 200px 1fr;
    gap: 24px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 56px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    border-bottom: 3px solid var(--color-accent);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  }

  .nav-list {
    display: none;
    flex-direction: column;
    width: 100%;
    padding: 8px 0;
  }

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

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

  .nav-list li a {
    padding: 12px 20px;
    border-radius: 0;
    font-size: 16px;
  }

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

  .hero-content {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

  .hero-figure img {
    height: 220px;
  }

  .category-nav-section,
  .recent-updates-section,
  .rank-preview-section,
  .guide-entry-section {
    padding: 36px 16px;
  }

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

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

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

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 16px 20px;
  }

  .footer-links {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

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

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

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

  .page-layout.sidebar-left {
    grid-template-columns: 1fr;
    padding: 0 16px;
    gap: 20px;
  }

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

  .category-content {
    order: 1;
  }

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

  .theme-block {
    padding: 16px;
  }

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

  .guide-card-grid {
    grid-template-columns: 1fr;
  }

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

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

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

  .rank-section .rank-item {
    gap: 14px;
    padding: 12px;
  }

  .rank-cover {
    width: 64px;
    height: 88px;
  }
}

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

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

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

  .btn {
    width: 100%;
  }

  .rank-list {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .rank-item img {
    height: 140px;
  }

  .tag-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .tag-card {
    padding: 12px;
  }

  .work-card {
    flex-direction: column;
  }

  .work-cover {
    width: 100%;
    height: 180px;
  }

  .update-item {
    padding: 10px;
  }

  .update-item img {
    width: 56px;
    height: 76px;
  }

  .footer-links {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }

  .rank-section .rank-item {
    flex-wrap: wrap;
  }

  .rank-section .rank-number {
    min-width: 32px;
    font-size: 20px;
  }

  .rank-cover {
    width: 56px;
    height: 76px;
  }

  .guide-figure img {
    height: 180px;
  }

  .tips-hero-figure img {
    height: 160px;
  }

  .error-content {
    padding: 28px 20px;
  }

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

@media (max-width: 390px) {
  .header-inner {
    padding: 0 12px;
  }

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

  .hero-content {
    padding: 0 16px;
  }

  .hero-figure img {
    height: 180px;
  }

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

  .rank-item {
    flex-direction: row;
    align-items: center;
  }

  .rank-item img {
    width: 72px;
    height: 100px;
    flex-shrink: 0;
  }

  .rank-info {
    flex: 1;
    min-width: 0;
  }

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

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

  .page-layout.sidebar-left {
    padding: 0 12px;
  }

  .category-aside {
    padding: 16px;
  }

  .theme-block {
    padding: 14px;
  }

  .guide-section,
  .rank-section,
  .rank-reason-section,
  .tips-section,
  .tips-related,
  .guide-related {
    padding-left: 16px;
    padding-right: 16px;
  }

  .guide-steps li {
    padding: 14px 14px 14px 48px;
  }

  .guide-steps li::before {
    left: 12px;
    top: 14px;
    width: 24px;
    height: 24px;
    font-size: 13px;
  }

  .rank-section .rank-item {
    flex-wrap: nowrap;
    align-items: flex-start;
  }

  .rank-section .rank-reason {
    -webkit-line-clamp: 3;
  }
}