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

:root {
  --color-primary: #1a2a3a;
  --color-bg: #f5f7fa;
  --color-accent: #e67e22;
  --color-white: #ffffff;
  --color-text: #333333;
  --color-text-light: #6b7a8a;
  --color-border: #e3e8ee;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", Consolas, Menlo,
    monospace;
  --container-width: 1200px;
  --radius: 8px;
  --header-height: 76px;
  --transition: 0.2s ease;
}

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

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

body {
  font-family: var(--font-sans);
  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-primary);
  text-decoration: none;
  transition: color var(--transition);
}

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

ul,
ol {
  list-style: none;
}

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

time {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--color-text-light);
}

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

.site-header {
  background-color: var(--color-primary);
  border-bottom: 3px solid var(--color-accent);
}

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

.brand {
  font-size: 1.5rem;
  font-weight: 700;
  white-space: nowrap;
}

.brand a {
  color: var(--color-white);
}

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

.site-nav {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-list li a {
  display: block;
  padding: 10px 18px;
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9375rem;
  border-radius: 4px;
  transition: background-color var(--transition), color var(--transition);
}

.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;
  background: none;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 4px;
  padding: 8px 12px;
  cursor: pointer;
  color: var(--color-white);
  font-size: 0.875rem;
  line-height: 1;
}

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

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

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

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

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

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

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

.page-header {
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 2rem;
  line-height: 1.25;
  margin-bottom: 12px;
}

.page-description {
  font-size: 1rem;
  color: var(--color-text-light);
  max-width: 720px;
}

.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.85);
  margin-top: auto;
}

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

.footer-brand p {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-bottom: 24px;
}

.footer-nav a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.875rem;
  padding: 4px 0;
}

.footer-nav a:hover {
  color: var(--color-white);
}

.footer-meta {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 16px;
}

.footer-meta p {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.6;
}

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

.section-title {
  font-size: 1.375rem;
  margin-bottom: 20px;
  padding-left: 12px;
  border-left: 4px solid var(--color-accent);
}

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

.hero {
  background-color: var(--color-primary);
  color: var(--color-white);
  margin: -32px -24px 32px;
  padding: 56px 24px;
}

.hero-inner {
  max-width: 960px;
  margin: 0 auto;
}

.hero h1 {
  color: var(--color-white);
  font-size: 2.25rem;
  line-height: 1.25;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 1.0625rem;
  color: rgba(255, 255, 255, 0.75);
  max-width: 640px;
  margin-bottom: 28px;
}

.hero-search {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

.search-placeholder {
  font-size: 1rem;
  color: var(--color-text);
  font-weight: 500;
}

.search-note {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.search-note a {
  color: var(--color-accent);
  font-weight: 500;
}

.hot-tags {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.875rem;
}

.hot-tags span {
  color: rgba(255, 255, 255, 0.6);
  margin-right: 4px;
}

.hot-tags a {
  color: rgba(255, 255, 255, 0.8);
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  padding: 4px 10px;
  transition: background-color var(--transition);
}

.hot-tags a:hover {
  background-color: var(--color-accent);
  color: var(--color-white);
}

/* ---------- channel nav ---------- */

.channel-nav {
  margin-bottom: 40px;
}

.channel-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.channel-tag {
  display: inline-block;
  padding: 10px 18px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-primary);
  transition: border-color var(--transition), color var(--transition),
    background-color var(--transition);
}

.channel-tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background-color: #fff8f2;
}

/* ---------- focus report ---------- */

.focus-report {
  margin-bottom: 40px;
}

.focus-card {
  background-color: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.focus-image {
  width: 100%;
  aspect-ratio: 21 / 9;
  object-fit: cover;
}

.focus-card figcaption {
  padding: 24px;
}

.focus-card h3 {
  font-size: 1.375rem;
  margin-bottom: 8px;
}

.focus-card h3 a {
  color: var(--color-primary);
}

.focus-card h3 a:hover {
  color: var(--color-accent);
}

.focus-card p {
  color: var(--color-text-light);
  margin-bottom: 12px;
  font-size: 0.9375rem;
}

.focus-card figcaption a {
  color: var(--color-accent);
  font-weight: 500;
  font-size: 0.9375rem;
}

/* ---------- latest news ---------- */

.latest-news {
  margin-bottom: 40px;
}

.news-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  background-color: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.news-item {
  padding: 20px 24px;
  border-bottom: 1px solid var(--color-border);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 24px;
  align-items: baseline;
}

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

.news-item h3 {
  font-size: 1.0625rem;
  grid-column: 1;
}

.news-item h3 a {
  color: var(--color-primary);
}

.news-item h3 a:hover {
  color: var(--color-accent);
}

.news-summary {
  grid-column: 1;
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

.news-item time {
  grid-column: 2;
  grid-row: 1 / span 2;
  white-space: nowrap;
}

/* ---------- topics ---------- */

.topics {
  margin-bottom: 40px;
}

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

.topic-card {
  background-color: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

.topic-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.topic-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.topic-card h3 {
  font-size: 1.125rem;
  margin: 16px 20px 8px;
}

.topic-card h3 a {
  color: var(--color-primary);
}

.topic-card h3 a:hover {
  color: var(--color-accent);
}

.topic-card p {
  margin: 0 20px 20px;
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

/* ---------- editor picks ---------- */

.editor-picks {
  margin-bottom: 40px;
}

.pick-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pick-item {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-accent);
}

.pick-item h3 {
  font-size: 1.0625rem;
  margin-bottom: 8px;
}

.pick-item h3 a {
  color: var(--color-primary);
}

.pick-item h3 a:hover {
  color: var(--color-accent);
}

.pick-reason {
  font-size: 0.875rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ---------- source feedback ---------- */

.source-feedback {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--color-border);
  margin-bottom: 40px;
}

.source-feedback > p {
  color: var(--color-text-light);
  margin-bottom: 16px;
  max-width: 720px;
}

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

.source-links a {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 0.9375rem;
  color: var(--color-primary);
}

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

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

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

/* ---------- channel list ---------- */

.channel-list {
  margin-bottom: 40px;
}

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

.channel-card {
  background-color: var(--color-white);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition);
}

.channel-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.channel-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.channel-content {
  padding: 20px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.channel-content h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.channel-content p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
  flex: 1;
}

.channel-content a {
  color: var(--color-accent);
  font-weight: 500;
  font-size: 0.9375rem;
  align-self: flex-start;
}

/* ---------- channel description ---------- */

.channel-description {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--color-border);
  margin-bottom: 24px;
}

.channel-description > p {
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.channel-points {
  margin: 16px 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 24px;
}

.channel-points li {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  padding-left: 16px;
  position: relative;
}

.channel-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

.channel-points strong {
  color: var(--color-primary);
  font-weight: 600;
}

.channel-description > p:last-of-type {
  margin-bottom: 0;
}

.channel-description a {
  color: var(--color-accent);
  font-weight: 500;
}

/* ---------- pagination ---------- */

.archive-pagination {
  text-align: center;
  padding: 16px;
  color: var(--color-text-light);
  font-size: 0.9375rem;
  background-color: var(--color-white);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

/* ---------- topic grid (topics page) ---------- */

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

.topic-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.topic-content {
  padding: 20px;
}

.topic-content h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.topic-content h3 a {
  color: var(--color-primary);
}

.topic-content h3 a:hover {
  color: var(--color-accent);
}

.topic-content p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.topic-content a {
  color: var(--color-accent);
  font-weight: 500;
  font-size: 0.9375rem;
}

/* ---------- topic intro ---------- */

.topic-intro {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--color-border);
  margin-top: 32px;
}

.intro-text p {
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.intro-text p:last-child {
  margin-bottom: 0;
}

.topic-links {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.topic-links a {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 0.9375rem;
  color: var(--color-primary);
}

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

/* ---------- article list (insight) ---------- */

.article-list {
  margin-bottom: 40px;
}

.article-item {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 24px;
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 16px;
  border: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

.article-item:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.article-media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: 4px;
}

.article-content h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.article-content h3 a {
  color: var(--color-primary);
}

.article-content h3 a:hover {
  color: var(--color-accent);
}

.article-meta {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  font-family: var(--font-mono);
  margin-bottom: 8px;
}

.article-content > p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.article-content > a {
  color: var(--color-accent);
  font-weight: 500;
  font-size: 0.9375rem;
}

/* ---------- analysis framework ---------- */

.analysis-framework {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--color-border);
  margin-bottom: 40px;
}

.analysis-framework > p {
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.framework-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 16px;
}

.framework-item {
  background-color: var(--color-bg);
  border-radius: 4px;
  padding: 20px;
  border-left: 3px solid var(--color-accent);
}

.framework-item h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.framework-item p {
  font-size: 0.875rem;
  color: var(--color-text-light);
}

.framework-note {
  font-size: 0.875rem;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
  margin-bottom: 0;
}

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

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

.related-links h2 {
  font-size: 1.125rem;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.related-links ul li {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}

.related-links ul li:last-child {
  border-bottom: none;
}

.related-links ul li a {
  color: var(--color-primary);
  font-size: 0.9375rem;
}

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

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

.guide-section {
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--color-border);
  margin-bottom: 24px;
}

.guide-section h2 {
  font-size: 1.375rem;
  margin-bottom: 16px;
  padding-left: 12px;
  border-left: 4px solid var(--color-accent);
}

.guide-section > p {
  color: var(--color-text-light);
  margin-bottom: 16px;
}

.content-media {
  margin: 16px 0 24px;
}

.content-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 4px;
}

.content-media figcaption {
  font-size: 0.8125rem;
  color: var(--color-text-light);
  padding: 8px 0;
  text-align: center;
}

.nav-item-list {
  display: grid;
  gap: 16px;
  margin-top: 16px;
}

.nav-item {
  background-color: var(--color-bg);
  border-radius: 4px;
  padding: 20px;
  border-left: 3px solid var(--color-accent);
}

.nav-item h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.nav-item p {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.source-list {
  margin: 16px 0;
}

.source-list li {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  padding: 6px 0;
  padding-left: 16px;
  position: relative;
}

.source-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: 50%;
}

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

.feedback-method {
  background-color: var(--color-bg);
  border-radius: 4px;
  padding: 20px;
}

.feedback-method h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.feedback-method p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.feedback-note {
  font-size: 0.875rem;
  color: var(--color-text-light);
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
  margin-bottom: 0;
}

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

.error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-section {
  text-align: center;
  background-color: var(--color-white);
  border-radius: var(--radius);
  padding: 48px 32px;
  max-width: 560px;
  border: 1px solid var(--color-border);
}

.error-code {
  font-size: 4rem;
  font-weight: 700;
  color: var(--color-accent);
  font-family: var(--font-mono);
  line-height: 1;
  margin-bottom: 16px;
}

.error-section h1 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

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

.error-actions {
  margin-bottom: 24px;
}

.error-btn {
  display: inline-block;
  padding: 12px 24px;
  background-color: var(--color-accent);
  color: var(--color-white);
  border-radius: 4px;
  font-weight: 500;
  font-size: 1rem;
}

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

.error-links {
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.error-links p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 8px;
}

.error-links ul {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.error-links ul li a {
  color: var(--color-primary);
  font-size: 0.875rem;
}

.error-links ul li a:hover {
  color: var(--color-accent);
}

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

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

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

/* ---------- channels ---------- */

.page-channels .channel-description > p a {
  color: var(--color-accent);
  font-weight: 500;
}

/* ---------- topics ---------- */

.page-topics .topic-cards {
  margin-bottom: 0;
}

/* ---------- insight ---------- */

.page-insight .article-list {
  margin-bottom: 24px;
}

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

.page-guide .guide-section:last-of-type {
  margin-bottom: 24px;
}

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

@media (max-width: 992px) {
  .pick-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .pick-item:last-child {
    grid-column: 1 / -1;
  }

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

  .feedback-method:last-child {
    grid-column: 1 / -1;
  }

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

@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    padding: 12px 16px;
    gap: 8px;
    min-height: auto;
  }

  .brand {
    font-size: 1.25rem;
  }

  .nav-toggle {
    display: block;
    order: 3;
    margin-left: auto;
  }

  .site-nav {
    flex-basis: 100%;
    order: 4;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 8px 0;
  }

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

  .nav-list li a {
    padding: 12px 16px;
    border-radius: 4px;
  }

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

  .hero {
    margin: -20px -16px 24px;
    padding: 40px 16px;
  }

  .hero h1 {
    font-size: 1.75rem;
  }

  .hero-lead {
    font-size: 1rem;
  }

  .hero-search {
    flex-direction: column;
    align-items: flex-start;
  }

  .topic-grid,
  .topic-cards,
  .channel-grid,
  .framework-grid {
    grid-template-columns: 1fr;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .news-item time {
    grid-column: 1;
    grid-row: auto;
  }

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

  .pick-item:last-child {
    grid-column: auto;
  }

  .channel-points {
    grid-template-columns: 1fr;
  }

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

  .article-media img {
    aspect-ratio: 16 / 9;
  }

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

  .feedback-method:last-child {
    grid-column: auto;
  }

  .footer-inner {
    padding: 32px 16px 24px;
  }

  .footer-nav {
    flex-direction: column;
    gap: 4px;
  }

  .breadcrumb {
    margin-bottom: 16px;
  }

  .page-header {
    margin-bottom: 24px;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .guide-section,
  .channel-description,
  .topic-intro,
  .analysis-framework,
  .source-feedback {
    padding: 24px 20px;
  }

  .error-main {
    padding: 32px 16px;
  }

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

  .error-code {
    font-size: 3rem;
  }
}

@media (max-width: 480px) {
  .brand {
    font-size: 1.125rem;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .hero-lead {
    font-size: 0.9375rem;
  }

  .hot-tags {
    gap: 6px;
  }

  .hot-tags a {
    padding: 4px 8px;
    font-size: 0.8125rem;
  }

  .section-title {
    font-size: 1.25rem;
  }

  .focus-card figcaption {
    padding: 16px;
  }

  .focus-card h3 {
    font-size: 1.125rem;
  }

  .news-item {
    padding: 16px;
  }

  .topic-card h3,
  .topic-content h3,
  .channel-content h3 {
    font-size: 1rem;
  }

  .topic-card p,
  .topic-content p,
  .channel-content p {
    font-size: 0.875rem;
  }

  .source-links,
  .topic-links {
    flex-direction: column;
    align-items: stretch;
  }

  .source-links a,
  .topic-links a {
    text-align: center;
  }

  .article-content h3 {
    font-size: 1rem;
  }

  .feedback-method {
    padding: 16px;
  }
}