/* ==========================================================================
   base
   ========================================================================== */
:root {
  --color-ink: #2F3438;
  --color-bg: #F7F8FA;
  --color-teal: #1D9A8A;
  --color-blue: #3B82F6;
  --color-line: #E5E7EB;
  --color-white: #FFFFFF;
  --color-gray: #6B7280;
  --color-gray-light: #9CA3AF;
  --color-bg-card: #FFFFFF;
  --radius-card: 8px;
  --radius-chip: 999px;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Hiragino Sans GB", sans-serif;
  --container-width: 1200px;
  --shadow-card: 0 1px 3px rgba(47, 52, 56, 0.06);
  --shadow-hover: 0 6px 16px rgba(47, 52, 56, 0.10);
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-ink);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  line-height: 1.35;
  font-weight: 600;
  color: var(--color-ink);
}

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 18px;
}

p {
  margin-bottom: 0;
}

time {
  color: var(--color-gray);
  font-size: 14px;
}

.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;
}

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

.container,
.header-inner,
.footer-layout,
.stats-inner,
.hero-block,
.workspace-section,
.recent-updates,
.rankings-preview,
.guide-feature,
.related-links,
.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

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

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

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

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

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand-link {
  display: flex;
  align-items: center;
  font-size: 20px;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0.02em;
}

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

.brand-name {
  white-space: nowrap;
}

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

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

.nav-list li {
  position: relative;
}

.nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--color-ink);
  border-radius: var(--radius-card);
  position: relative;
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 2px;
  background-color: var(--color-teal);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--transition-base);
  border-radius: 1px;
}

.nav-list a:hover {
  color: var(--color-teal);
}

.nav-list a:hover::after,
.nav-list a.is-current::after {
  transform: scaleX(1);
}

.nav-list a.is-current {
  color: var(--color-teal);
  font-weight: 600;
}

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

.nav-toggle:hover {
  background-color: var(--color-bg);
}

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

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

.hero-block {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: center;
  padding-top: 56px;
  padding-bottom: 56px;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 20px;
}

.hero-title {
  font-size: 32px;
  line-height: 1.3;
  font-weight: 700;
}

.hero-slogan {
  font-size: 17px;
  color: var(--color-gray);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 8px;
}

.btn-primary,
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-card);
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

.btn-primary:hover {
  background-color: #167f72;
  border-color: #167f72;
  color: var(--color-white);
  box-shadow: var(--shadow-hover);
}

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

.btn-secondary:hover {
  border-color: var(--color-teal);
  color: var(--color-teal);
}

.hero-figure {
  margin: 0;
}

.hero-figure img {
  width: 100%;
  height: 360px;
  object-fit: cover;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-hover);
}

/* ---------- section titles ---------- */

.section-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-ink);
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.more-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-teal);
  white-space: nowrap;
}

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

.section-desc,
.section-intro {
  font-size: 15px;
  color: var(--color-gray);
  line-height: 1.7;
  margin-bottom: 20px;
}

/* ---------- workspace ---------- */

.workspace-section {
  padding-bottom: 48px;
}

.workspace-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 32px;
  align-items: start;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 24px;
}

.filter-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.filter-panel .section-title {
  font-size: 16px;
}

.filter-chips {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.filter-chips li {
  display: block;
}

.chip {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--color-ink);
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-chip);
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.chip:hover {
  background-color: var(--color-teal);
  border-color: var(--color-teal);
  color: var(--color-white);
}

.cover-wall {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.cover-wall .section-title {
  font-size: 16px;
}

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

/* ---------- comic card ---------- */

.comic-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.comic-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-teal);
}

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

.comic-card .comic-name {
  font-size: 15px;
  font-weight: 600;
  padding: 12px 12px 4px;
  margin: 0;
}

.comic-card .comic-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--color-teal);
  padding: 0 12px;
}

.comic-card .comic-status {
  display: block;
  font-size: 12px;
  color: var(--color-gray);
  padding: 2px 12px 12px;
}

/* ---------- stats bar ---------- */

.stats-bar {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  padding: 20px 0;
  margin-bottom: 48px;
}

.stats-inner {
  display: flex;
  align-items: center;
  gap: 32px;
}

.stats-text {
  font-size: 15px;
  color: var(--color-gray);
  flex-shrink: 0;
}

.stats-text strong {
  font-size: 20px;
  color: var(--color-teal);
  font-variant-numeric: tabular-nums;
}

.chart-line {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 36px;
  flex: 1;
}

.chart-seg {
  display: block;
  border-radius: 3px 3px 0 0;
  background-color: var(--color-teal);
  opacity: 0.85;
}

.chart-seg-wide {
  width: 28%;
  height: 100%;
}

.chart-seg-medium {
  width: 22%;
  height: 78%;
}

.chart-seg-small {
  width: 18%;
  height: 58%;
}

.chart-seg-smaller {
  width: 16%;
  height: 42%;
}

.chart-seg-smallest {
  width: 16%;
  height: 30%;
}

/* ---------- recent updates ---------- */

.recent-updates {
  padding-bottom: 48px;
}

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

.update-item {
  display: flex;
  gap: 14px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 14px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.update-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-teal);
}

.update-item img {
  width: 72px;
  height: 96px;
  object-fit: cover;
  border-radius: 6px;
  flex-shrink: 0;
}

.update-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.update-info h3 {
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.update-info p {
  font-size: 13px;
  color: var(--color-gray);
}

.update-info time {
  font-size: 13px;
  color: var(--color-gray-light);
}

/* ---------- rankings ---------- */

.rankings-preview {
  padding-bottom: 48px;
}

.rank-list {
  display: flex;
  flex-direction: column;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.rank-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--color-line);
  transition: background-color var(--transition-fast);
}

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

.rank-item:hover {
  background-color: var(--color-bg);
}

.rank-num {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-gray-light);
  font-variant-numeric: tabular-nums;
  width: 32px;
  text-align: center;
  flex-shrink: 0;
}

.rank-item:nth-child(1) .rank-num,
.rank-item:nth-child(2) .rank-num,
.rank-item:nth-child(3) .rank-num {
  color: var(--color-teal);
}

.rank-item img {
  width: 48px;
  height: 64px;
  object-fit: cover;
  border-radius: 4px;
  flex-shrink: 0;
}

.rank-meta {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.rank-meta h3 {
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.rank-meta .tag {
  font-size: 12px;
  color: var(--color-gray);
}

.trend {
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
}

.trend-up {
  color: #dc2626;
}

.trend-up::before {
  content: "▲ ";
  font-size: 11px;
}

.trend-down {
  color: var(--color-teal);
}

.trend-down::before {
  content: "▼ ";
  font-size: 11px;
}

.trend-steady {
  color: var(--color-gray);
}

.trend-steady::before {
  content: "— ";
  font-size: 11px;
}

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

.guide-feature {
  padding-bottom: 48px;
}

.guide-feature .section-title {
  margin-bottom: 20px;
}

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

.step-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 20px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.step-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--color-teal);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 700;
  border-radius: 50%;
  flex-shrink: 0;
}

.step-item h3 {
  font-size: 16px;
  font-weight: 600;
}

.step-item p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
}

.guide-note {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
}

.guide-note a {
  font-weight: 500;
}

/* ---------- related links ---------- */

.related-links {
  padding-bottom: 48px;
}

.related-links-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
  margin-right: 12px;
}

.related-links-item {
  display: inline-block;
  font-size: 14px;
  color: var(--color-teal);
  margin-right: 16px;
}

.related-links-item:hover {
  color: var(--color-blue);
}

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

.site-footer {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-line);
  padding-top: 40px;
  margin-top: 24px;
}

.footer-layout {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  padding-bottom: 32px;
}

.footer-col h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 14px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

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

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

.footer-bottom {
  border-top: 1px solid var(--color-line);
  padding: 16px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--color-gray-light);
  line-height: 1.6;
}

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

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

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

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-gray);
  margin-bottom: 20px;
  padding-top: 8px;
}

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

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

.breadcrumb-sep {
  color: var(--color-gray-light);
}

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

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

.page-header {
  margin-bottom: 28px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.page-description {
  font-size: 15px;
  color: var(--color-gray);
  line-height: 1.7;
  max-width: 720px;
}

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

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

.category-index {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 32px;
}

.category-index .section-intro {
  margin-bottom: 16px;
}

.category-index-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.category-index-list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  font-size: 14px;
  color: var(--color-ink);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.category-index-list a::before {
  content: attr(data-index);
  font-size: 12px;
  color: var(--color-gray-light);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

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

.category-index-list a:hover::before {
  color: rgba(255, 255, 255, 0.8);
}

.coverwall {
  margin-bottom: 32px;
}

.category-group {
  margin-bottom: 32px;
  scroll-margin-top: 80px;
}

.category-group h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-ink);
  margin-bottom: 14px;
  padding-left: 12px;
  border-left: 3px solid var(--color-teal);
}

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

.cover-card-list .comic-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.cover-card-list .comic-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-teal);
}

.cover-card-list .comic-card figure {
  margin: 0;
}

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

.cover-card-list .comic-card figcaption {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
  padding: 10px 12px 2px;
}

.cover-card-list .comic-tag {
  display: inline-block;
  font-size: 12px;
  color: var(--color-teal);
  padding: 0 12px;
}

.cover-card-list .comic-status {
  display: block;
  font-size: 12px;
  color: var(--color-gray);
  padding: 2px 12px 12px;
}

.category-note {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 24px;
}

.category-note h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.category-note p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
  margin-bottom: 10px;
}

.category-note p:last-child {
  margin-bottom: 0;
}

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

.summary-stats {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 32px;
}

.summary-stats .section-title {
  margin-bottom: 16px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background-color: var(--color-bg);
  border-radius: var(--radius-card);
  padding: 16px;
}

.stat-number {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-teal);
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.stat-label {
  font-size: 13px;
  color: var(--color-gray);
}

.genre-chart {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.chart-bar {
  display: grid;
  grid-template-columns: 80px 1fr 56px;
  align-items: center;
  gap: 12px;
}

.bar-label {
  font-size: 13px;
  color: var(--color-ink);
  white-space: nowrap;
}

.bar-track {
  display: block;
  height: 8px;
  background-color: var(--color-bg);
  border-radius: 4px;
  overflow: hidden;
}

.bar-fill {
  display: block;
  height: 100%;
  background-color: var(--color-teal);
  border-radius: 4px;
}

.bar-fill-wide {
  width: 82%;
}

.bar-fill-mid {
  width: 64%;
}

.bar-fill-narrow {
  width: 45%;
}

.bar-value {
  font-size: 13px;
  color: var(--color-gray);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.stats-note {
  font-size: 13px;
  color: var(--color-gray);
  line-height: 1.6;
}

.timeline-list {
  margin-bottom: 32px;
}

.timeline-list .section-title {
  margin-bottom: 8px;
}

.timeline-day {
  margin-bottom: 28px;
  scroll-margin-top: 80px;
}

.day-heading {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-teal);
  margin-bottom: 16px;
  display: inline-block;
}

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

.update-card {
  display: flex;
  gap: 14px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 14px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.update-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-teal);
}

.update-cover {
  width: 64px;
  height: 88px;
  object-fit: cover;
  border-radius: 6px;
  flex-shrink: 0;
}

.update-card .update-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.update-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.update-genre {
  font-size: 12px;
  color: var(--color-teal);
}

.update-detail {
  font-size: 13px;
  color: var(--color-gray);
  line-height: 1.5;
}

.update-time {
  font-size: 12px;
  color: var(--color-gray-light);
}

.related-links p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
}

.related-links a {
  font-weight: 500;
}

/* ---------- completed page ---------- */

.filter-panel {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 32px;
}

.filter-panel .section-title {
  margin-bottom: 16px;
}

.filter-group {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 14px;
}

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

.filter-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
  flex-shrink: 0;
  padding-top: 6px;
  min-width: 56px;
}

.filter-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-list a {
  display: inline-block;
  padding: 6px 14px;
  font-size: 13px;
  color: var(--color-ink);
  background-color: var(--color-bg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-chip);
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.filter-list a:hover {
  background-color: var(--color-teal);
  border-color: var(--color-teal);
  color: var(--color-white);
}

.result-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 32px;
}

.result-list .section-title {
  margin-bottom: 8px;
}

.result-item {
  display: flex;
  gap: 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 20px;
  scroll-margin-top: 80px;
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.result-item:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--color-teal);
}

.result-cover {
  flex-shrink: 0;
}

.result-cover img {
  width: 88px;
  height: 120px;
  object-fit: cover;
  border-radius: 6px;
}

.result-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.result-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-ink);
}

.result-meta {
  font-size: 13px;
  color: var(--color-gray);
  line-height: 1.5;
}

.result-desc {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.6;
  margin-top: 4px;
}

.completed-note {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 24px;
}

.completed-note h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.completed-note p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
  margin-bottom: 10px;
}

.completed-note p:last-child {
  margin-bottom: 0;
}

.completed-note a {
  font-weight: 500;
}

/* ---------- rankings page ---------- */

.tab-nav {
  display: flex;
  gap: 8px;
  margin-bottom: 28px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 8px;
  width: fit-content;
}

.tab-item {
  display: inline-block;
  padding: 8px 24px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
  border-radius: 6px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.tab-item:hover {
  background-color: var(--color-bg);
  color: var(--color-teal);
}

.ranking-section {
  margin-bottom: 32px;
  scroll-margin-top: 80px;
}

.ranking-section .section-head {
  margin-bottom: 16px;
}

.ranking-section .section-desc {
  margin-bottom: 16px;
}

.ranking-list {
  display: flex;
  flex-direction: column;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.ranking-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--color-line);
  transition: background-color var(--transition-fast);
}

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

.ranking-item:hover {
  background-color: var(--color-bg);
}

.rank-number {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-gray-light);
  font-variant-numeric: tabular-nums;
  width: 36px;
  text-align: center;
  flex-shrink: 0;
}

.ranking-item:nth-child(1) .rank-number,
.ranking-item:nth-child(2) .rank-number,
.ranking-item:nth-child(3) .rank-number {
  color: var(--color-teal);
}

.rank-cover {
  flex-shrink: 0;
}

.rank-cover img {
  width: 48px;
  height: 64px;
  object-fit: cover;
  border-radius: 4px;
}

.rank-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

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

.rank-tag {
  font-size: 12px;
  color: var(--color-gray);
}

.rank-change {
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
}

.rank-change.up {
  color: #dc2626;
}

.rank-change.up::before {
  content: "▲ ";
  font-size: 11px;
}

.rank-change.down {
  color: var(--color-teal);
}

.rank-change.down::before {
  content: "▼ ";
  font-size: 11px;
}

.rank-heat {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-teal);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  flex-shrink: 0;
}

.ranking-note {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 24px;
}

.ranking-note h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.ranking-note p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
  margin-bottom: 10px;
}

.ranking-note p:last-child {
  margin-bottom: 0;
}

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

.view-tabs {
  margin-bottom: 28px;
}

.tab-group {
  display: flex;
  gap: 8px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 8px;
  width: fit-content;
}

.tab-group .tab-item {
  display: inline-block;
  padding: 8px 24px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
  border-radius: 6px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.tab-group .tab-item:hover {
  background-color: var(--color-bg);
  color: var(--color-teal);
}

.latest-questions {
  margin-bottom: 32px;
}

.latest-questions h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

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

.question-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 20px;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.question-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.question-card h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
}

.question-card p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
}

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

.faq-section h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}

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

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
  transition: background-color var(--transition-fast);
}

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

.faq-item summary::after {
  content: "+";
  font-size: 20px;
  font-weight: 400;
  color: var(--color-gray);
  transition: transform var(--transition-fast);
}

.faq-item[open] summary {
  background-color: var(--color-bg);
}

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

.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
}

.reading-steps {
  margin-bottom: 32px;
}

.reading-steps h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

.steps-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  align-items: start;
  margin-top: 16px;
}

.steps-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.steps-content .step-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 20px;
}

.steps-content .step-item h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.steps-content .step-item p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
}

.step-figure {
  margin: 0;
}

.step-figure img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  border-radius: var(--radius-card);
}

.step-figure figcaption {
  font-size: 13px;
  color: var(--color-gray);
  line-height: 1.6;
  padding-top: 10px;
}

.reading-steps .related-links {
  margin-top: 20px;
  padding: 0;
}

.reading-steps .related-links p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
}

.reading-steps .related-links a {
  font-weight: 500;
}

/* ---------- about page ---------- */

.intro-block {
  display: flex;
  flex-direction: column;
  gap: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 32px;
  margin-bottom: 32px;
}

.intro-text {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 720px;
}

.intro-text p {
  font-size: 15px;
  color: var(--color-ink);
  line-height: 1.8;
}

.archive-figure {
  margin: 0;
  max-width: 480px;
}

.archive-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius-card);
}

.archive-figure figcaption {
  font-size: 13px;
  color: var(--color-gray);
  line-height: 1.6;
  padding-top: 8px;
}

.principle-list {
  margin-bottom: 32px;
}

.principle-list h2 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 16px;
}

.principle-list ol {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.principle-list li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 20px 24px;
}

.principle-list li h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-ink);
}

.principle-list li p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
}

.copyright-note {
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 24px;
}

.copyright-note h2 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}

.copyright-note p {
  font-size: 14px;
  color: var(--color-gray);
  line-height: 1.7;
  margin-bottom: 10px;
}

.copyright-note p:last-child {
  margin-bottom: 0;
}

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

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
}

.error-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  text-align: center;
  max-width: 560px;
  background-color: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  padding: 48px 32px;
}

.error-code {
  font-size: 64px;
  font-weight: 700;
  color: var(--color-teal);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.error-section h1 {
  font-size: 24px;
  font-weight: 600;
  color: var(--color-ink);
}

.error-desc {
  font-size: 15px;
  color: var(--color-gray);
  line-height: 1.7;
}

.error-home-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 28px;
  background-color: var(--color-teal);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-card);
  border: 1px solid var(--color-teal);
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.error-home-link:hover {
  background-color: #167f72;
  color: var(--color-white);
  box-shadow: var(--shadow-hover);
}

.error-tip {
  font-size: 13px;
  color: var(--color-gray-light);
}

.error-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.error-links a {
  font-size: 14px;
  color: var(--color-teal);
  font-weight: 500;
  padding: 4px 0;
}

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

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

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

  .hero-figure img {
    height: 300px;
  }

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

  .filter-chips {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 8px;
  }

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

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

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

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

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

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

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

  .step-figure img {
    height: 240px;
  }
}

@media (max-width: 768px) {
  .container,
  .header-inner,
  .footer-layout,
  .stats-inner,
  .hero-block,
  .workspace-section,
  .recent-updates,
  .rankings-preview,
  .guide-feature,
  .related-links,
  .inner-main {
    padding-left: 16px;
    padding-right: 16px;
  }

  .header-inner {
    height: 56px;
  }

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

  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background-color: var(--color-white);
    padding: 16px;
    overflow-y: auto;
    z-index: 99;
  }

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

  .nav-list li {
    border-bottom: 1px solid var(--color-line);
  }

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

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

  .nav-list a::after {
    display: none;
  }

  .hero-block {
    padding-top: 32px;
    padding-bottom: 32px;
  }

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

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

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

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn-primary,
  .btn-secondary {
    width: 100%;
  }

  .workspace-section,
  .recent-updates,
  .rankings-preview,
  .guide-feature {
    padding-bottom: 32px;
  }

  .workspace-layout {
    padding: 16px;
  }

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

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

  .stats-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .chart-line {
    width: 100%;
  }

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

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

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

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

  .timeline-items {
    grid-template-columns: 1fr;
  }

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

  .chart-bar {
    grid-template-columns: 60px 1fr 44px;
    gap: 8px;
  }

  .result-item {
    flex-direction: column;
    gap: 14px;
  }

  .result-cover img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 6px;
  }

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

  .tab-nav,
  .tab-group {
    width: 100%;
    overflow-x: auto;
  }

  .tab-item {
    flex-shrink: 0;
    padding: 8px 16px;
  }

  .filter-group {
    flex-direction: column;
    gap: 8px;
  }

  .filter-label {
    padding-top: 0;
  }

  .intro-block {
    padding: 20px;
  }

  .archive-figure img {
    height: 200px;
  }

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

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

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

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

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

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

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

  .ranking-item {
    gap: 10px;
    padding: 12px 14px;
  }

  .rank-number {
    width: 28px;
    font-size: 16px;
  }

  .rank-cover img {
    width: 40px;
    height: 56px;
  }

  .rank-change,
  .rank-heat {
    font-size: 12px;
  }
}