/* ==========================================================================
   base / reset & root
   ========================================================================== */

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

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

body {
  margin: 0;
  font-family: "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: #2b3440;
  background-color: #f5f7fa;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: Georgia, "Times New Roman", "Songti SC", SimSun, serif;
  color: #1a2a3a;
  line-height: 1.35;
  margin: 0 0 0.75rem 0;
  font-weight: 700;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.125rem;
}

h4 {
  font-size: 1rem;
}

p {
  margin: 0 0 1rem 0;
}

ul, ol {
  margin: 0 0 1rem 0;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.375rem;
}

a {
  color: #1a2a3a;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #e67e22;
}

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

figure {
  margin: 0;
}

time {
  color: #6b7785;
  font-size: 0.875rem;
}

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

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: #f5f7fa;
}

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

.site-main.inner-main {
  padding-bottom: 3rem;
}

.site-header {
  background-color: #1a2a3a;
  border-bottom: 3px solid #e67e22;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 1rem;
}

.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  padding: 0.5rem 0;
}

.brand-name {
  font-family: Georgia, "Times New Roman", "Songti SC", SimSun, serif;
  font-size: 1.375rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.02em;
}

.brand-slogan {
  font-size: 0.75rem;
  color: #c0c8d0;
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list li {
  margin: 0;
}

.nav-list a {
  display: block;
  padding: 0.625rem 0.875rem;
  color: #d8dee5;
  font-size: 0.9375rem;
  border-radius: 4px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-list a:hover {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.08);
}

.nav-list a.is-current {
  color: #ffffff;
  background-color: rgba(230, 126, 34, 0.25);
  font-weight: 700;
}

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

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: #ffffff;
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-footer {
  background-color: #1a2a3a;
  color: #c0c8d0;
  margin-top: auto;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1rem 1rem;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 2rem;
}

.footer-col h4 {
  color: #ffffff;
  font-size: 1rem;
  margin-bottom: 0.75rem;
  font-family: "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

.footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-col ul li {
  margin-bottom: 0.375rem;
}

.footer-col a {
  color: #c0c8d0;
  font-size: 0.875rem;
  line-height: 1.6;
}

.footer-col a:hover {
  color: #e67e22;
}

.footer-about p {
  font-size: 0.875rem;
  line-height: 1.7;
  color: #aab4bf;
}

.footer-brand {
  font-family: Georgia, "Times New Roman", "Songti SC", SimSun, serif;
  font-size: 1.125rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.5rem;
}

.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
}

.footer-bottom p {
  margin: 0;
  font-size: 0.8125rem;
  color: #8a95a1;
}

/* ==========================================================================
   components / breadcrumb & page header
   ========================================================================== */

.breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1rem 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.375rem;
  font-size: 0.875rem;
  color: #6b7785;
}

.breadcrumb a {
  color: #6b7785;
}

.breadcrumb a:hover {
  color: #e67e22;
}

.breadcrumb-sep {
  color: #aab4bf;
  margin: 0 0.125rem;
}

.breadcrumb-current {
  color: #1a2a3a;
  font-weight: 600;
}

.page-header {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 1rem 1.75rem;
}

.page-title {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: #1a2a3a;
}

.page-description {
  font-size: 1rem;
  color: #4a5561;
  max-width: 720px;
  margin-bottom: 0;
}

/* ==========================================================================
   components / buttons & links
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.375rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  min-height: 44px;
}

.btn-primary {
  background-color: #e67e22;
  color: #ffffff;
}

.btn-primary:hover {
  background-color: #cf6d15;
  color: #ffffff;
}

.btn-secondary {
  background-color: transparent;
  border-color: #c0c8d0;
  color: #1a2a3a;
}

.btn-secondary:hover {
  border-color: #1a2a3a;
  background-color: rgba(26, 42, 58, 0.04);
}

.read-more {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  color: #e67e22;
}

.read-more:hover {
  color: #cf6d15;
  text-decoration: underline;
}

.more-link {
  text-align: center;
  margin-top: 1rem;
}

.more-link a {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  border: 1px solid #c0c8d0;
  border-radius: 6px;
  font-size: 0.875rem;
  color: #1a2a3a;
  min-height: 44px;
  line-height: 2.2;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.more-link a:hover {
  border-color: #1a2a3a;
  background-color: #ffffff;
}

/* ==========================================================================
   components / section titles
   ========================================================================== */

.section-title {
  font-size: 1.5rem;
  color: #1a2a3a;
  margin-bottom: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #e67e22;
  display: inline-block;
}

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

.home-main {
  padding-bottom: 3rem;
}

/* hero */
.hero-section {
  background-color: #1a2a3a;
  padding: 3rem 1rem;
}

.hero-section .hero-copy {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-copy h1 {
  color: #ffffff;
  font-size: 2.25rem;
  margin-bottom: 1rem;
  line-height: 1.3;
}

.hero-lead {
  color: #c0c8d0;
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-actions .btn-primary {
  background-color: #e67e22;
}

.hero-actions .btn-secondary {
  border-color: #c0c8d0;
  color: #ffffff;
}

.hero-actions .btn-secondary:hover {
  border-color: #ffffff;
  background-color: rgba(255, 255, 255, 0.06);
}

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

.hero-figure {
  border-radius: 8px;
  overflow: hidden;
  background-color: #2a3a4a;
}

.hero-figure img {
  width: 100%;
  height: 280px;
  object-fit: cover;
}

/* focus report */
.focus-report-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 1rem 1rem;
}

.focus-report-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.focus-report-card {
  background-color: #ffffff;
  border: 1px solid #e8ecef;
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.focus-report-card:hover {
  box-shadow: 0 6px 20px rgba(26, 42, 58, 0.08);
  transform: translateY(-2px);
}

.focus-report-media {
  overflow: hidden;
}

.focus-report-media img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.focus-report-body {
  padding: 1.25rem 1.5rem 1.5rem;
}

.focus-report-body h3 {
  margin-bottom: 0.375rem;
}

.focus-report-body h3 a {
  color: #1a2a3a;
}

.focus-report-body h3 a:hover {
  color: #e67e22;
}

.focus-report-meta {
  font-size: 0.8125rem;
  color: #8a95a1;
  margin-bottom: 0.625rem;
}

.focus-report-body p {
  font-size: 0.9375rem;
  color: #4a5561;
  line-height: 1.7;
}

/* channel nav */
.channel-nav-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1rem 1rem;
}

.channel-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
}

.channel-tags li {
  margin: 0;
}

.tag {
  display: inline-block;
  padding: 0.5rem 1.25rem;
  background-color: #ffffff;
  border: 1px solid #d8dee5;
  border-radius: 6px;
  font-size: 0.9375rem;
  color: #1a2a3a;
  min-height: 44px;
  line-height: 2;
  transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.tag:hover {
  border-color: #e67e22;
  color: #e67e22;
  background-color: rgba(230, 126, 34, 0.04);
}

.channel-desc {
  font-size: 0.9375rem;
  color: #4a5561;
  max-width: 720px;
}

/* latest news */
.latest-news-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1rem 1rem;
}

.news-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid #e8ecef;
}

.news-item {
  margin: 0;
  border-bottom: 1px solid #e8ecef;
}

.news-article {
  padding: 1.25rem 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.25rem;
}

.news-article h3 {
  margin-bottom: 0.25rem;
  font-size: 1.125rem;
}

.news-article h3 a {
  color: #1a2a3a;
}

.news-article h3 a:hover {
  color: #e67e22;
}

.news-meta {
  font-size: 0.8125rem;
  color: #8a95a1;
  margin-bottom: 0.375rem;
}

.news-summary {
  font-size: 0.9375rem;
  color: #4a5561;
  line-height: 1.7;
  margin-bottom: 0;
}

/* topic cards */
.topic-cards-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1rem 1rem;
}

.topic-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.topic-card {
  background-color: #ffffff;
  border: 1px solid #e8ecef;
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.25s ease;
}

.topic-card:hover {
  box-shadow: 0 6px 20px rgba(26, 42, 58, 0.08);
}

.topic-media {
  overflow: hidden;
}

.topic-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.topic-body {
  padding: 1.25rem 1.5rem 1.5rem;
}

.topic-body h3 {
  margin-bottom: 0.5rem;
}

.topic-body h3 a {
  color: #1a2a3a;
}

.topic-body h3 a:hover {
  color: #e67e22;
}

.topic-body p {
  font-size: 0.9375rem;
  color: #4a5561;
  margin-bottom: 0;
}

/* editor picks */
.editor-picks-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1rem 1rem;
}

.picks-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}

.pick-item {
  margin: 0;
}

.pick-link {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.875rem 1.25rem;
  background-color: #ffffff;
  border: 1px solid #e8ecef;
  border-radius: 6px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.pick-link:hover {
  border-color: #c0c8d0;
  box-shadow: 0 4px 12px rgba(26, 42, 58, 0.06);
}

.pick-title {
  font-weight: 600;
  color: #1a2a3a;
  flex-shrink: 0;
  min-width: 180px;
}

.pick-reason {
  font-size: 0.875rem;
  color: #4a5561;
}

/* feedback */
.feedback-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1rem 1rem;
}

.feedback-section > p {
  font-size: 0.9375rem;
  color: #4a5561;
  max-width: 720px;
}

.feedback-steps {
  list-style: none;
  margin: 1rem 0 1rem;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1rem;
}

.feedback-steps li {
  margin: 0;
}

.feedback-steps a {
  display: block;
  padding: 1rem 1.25rem;
  background-color: #ffffff;
  border: 1px solid #e8ecef;
  border-radius: 6px;
  font-size: 0.9375rem;
  color: #1a2a3a;
  min-height: 44px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.feedback-steps a:hover {
  border-color: #e67e22;
  box-shadow: 0 4px 12px rgba(26, 42, 58, 0.06);
}

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

.channel-index {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
}

.channel-index .section-title {
  margin-bottom: 1.5rem;
}

.channel-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.channel-card {
  background-color: #ffffff;
  border: 1px solid #e8ecef;
  border-radius: 8px;
  overflow: hidden;
  transition: box-shadow 0.25s ease;
}

.channel-card:hover {
  box-shadow: 0 6px 20px rgba(26, 42, 58, 0.08);
}

.channel-media {
  overflow: hidden;
}

.channel-media img {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

.channel-body {
  padding: 1.25rem 1.5rem 1.5rem;
}

.channel-body h3 {
  margin-bottom: 0.375rem;
}

.channel-body p {
  font-size: 0.875rem;
  color: #4a5561;
  line-height: 1.7;
  margin-bottom: 0.75rem;
}

.channel-body a {
  font-size: 0.875rem;
  font-weight: 600;
  color: #e67e22;
}

.channel-body a:hover {
  color: #cf6d15;
  text-decoration: underline;
}

.channel-notes {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem 3rem;
}

.notes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1.5rem;
}

.note-item {
  background-color: #ffffff;
  border: 1px solid #e8ecef;
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
}

.note-item h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.note-item p {
  font-size: 0.875rem;
  color: #4a5561;
  margin-bottom: 0;
  line-height: 1.7;
}

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

.topic-list {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
}

.topic-list .section-title {
  margin-bottom: 1.5rem;
}

.topic-item {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 1.5rem;
  background-color: #ffffff;
  border: 1px solid #e8ecef;
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 1.25rem;
  transition: box-shadow 0.25s ease;
}

.topic-item:hover {
  box-shadow: 0 6px 20px rgba(26, 42, 58, 0.08);
}

.topic-media {
  overflow: hidden;
  border-radius: 6px;
}

.topic-media img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

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

.topic-name {
  font-size: 1.25rem;
  margin-bottom: 0.375rem;
}

.topic-meta {
  font-size: 0.8125rem;
  color: #8a95a1;
  margin-bottom: 0.625rem;
}

.topic-desc {
  font-size: 0.9375rem;
  color: #4a5561;
  line-height: 1.7;
  margin-bottom: 1rem;
}

.topic-articles {
  list-style: none;
  margin: 0 0 1rem;
  padding: 0;
}

.topic-articles li {
  margin-bottom: 0.375rem;
}

.topic-articles a {
  font-size: 0.875rem;
  color: #1a2a3a;
  display: inline-block;
  padding: 0.25rem 0;
}

.topic-articles a:hover {
  color: #e67e22;
}

.topic-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: #e67e22;
}

.topic-link:hover {
  color: #cf6d15;
  text-decoration: underline;
}

/* topic recommend */
.topic-recommend {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
}

.section-desc {
  font-size: 0.9375rem;
  color: #4a5561;
  max-width: 720px;
  margin-bottom: 1.5rem;
}

.recommend-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.recommend-card {
  background-color: #ffffff;
  border: 1px solid #e8ecef;
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  transition: box-shadow 0.25s ease;
}

.recommend-card:hover {
  box-shadow: 0 6px 20px rgba(26, 42, 58, 0.08);
}

.recommend-title {
  font-size: 1.0625rem;
  margin-bottom: 0.5rem;
}

.recommend-excerpt {
  font-size: 0.875rem;
  color: #4a5561;
  line-height: 1.7;
  margin-bottom: 0.75rem;
}

.recommend-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: #e67e22;
}

.recommend-link:hover {
  color: #cf6d15;
  text-decoration: underline;
}

.related-links {
  background-color: #eef1f4;
  border-radius: 8px;
  padding: 1.5rem;
}

.related-title {
  font-size: 1rem;
  margin-bottom: 0.75rem;
}

.related-links ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.related-links ul li {
  margin: 0;
}

.related-links ul a {
  font-size: 0.875rem;
  color: #1a2a3a;
  display: inline-block;
  padding: 0.25rem 0;
}

.related-links ul a:hover {
  color: #e67e22;
}

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

.guide-layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2rem;
  align-items: start;
}

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

.guide-section {
  background-color: #ffffff;
  border: 1px solid #e8ecef;
  border-radius: 8px;
  padding: 1.75rem 2rem;
  margin-bottom: 1.5rem;
}

.guide-section h2 {
  font-size: 1.375rem;
  margin-bottom: 0.875rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #e8ecef;
}

.guide-section p {
  font-size: 0.9375rem;
  color: #4a5561;
  line-height: 1.8;
}

.method-list,
.mistake-list,
.advice-list {
  padding-left: 1.25rem;
}

.method-list li,
.mistake-list li,
.advice-list li {
  font-size: 0.9375rem;
  color: #4a5561;
  line-height: 1.75;
  margin-bottom: 0.625rem;
}

.method-list strong,
.mistake-list strong,
.advice-list strong {
  color: #1a2a3a;
  font-weight: 600;
}

.guide-figure {
  margin-top: 1.5rem;
  border-radius: 8px;
  overflow: hidden;
}

.guide-figure img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 0.75rem 1rem;
  background-color: #f5f7fa;
  font-size: 0.8125rem;
  color: #6b7785;
  text-align: center;
}

.guide-related {
  background-color: #eef1f4;
  border-radius: 8px;
  padding: 1.5rem;
  position: sticky;
  top: 84px;
}

.guide-related h2 {
  font-size: 1.125rem;
  margin-bottom: 1rem;
}

.guide-related ul {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
}

.guide-related ul li {
  margin-bottom: 0.5rem;
}

.guide-related ul a {
  font-size: 0.875rem;
  color: #1a2a3a;
  line-height: 1.6;
  display: inline-block;
  padding: 0.25rem 0;
}

.guide-related ul a:hover {
  color: #e67e22;
}

.guide-note {
  background-color: #ffffff;
  border-left: 3px solid #e67e22;
  border-radius: 4px;
  padding: 1rem 1.25rem;
}

.guide-note p {
  font-size: 0.875rem;
  color: #4a5561;
  margin-bottom: 0;
  line-height: 1.7;
}

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

.faq-category-overview {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
}

.content-media-inline {
  margin-bottom: 1.5rem;
}

.content-media-inline img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: 8px;
}

.content-media-inline figcaption {
  font-size: 0.8125rem;
  color: #6b7785;
  text-align: center;
  padding: 0.5rem 0;
}

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

.category-item {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 1rem 1.25rem;
  background-color: #ffffff;
  border: 1px solid #e8ecef;
  border-radius: 6px;
  min-height: 44px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.category-item:hover {
  border-color: #e67e22;
  box-shadow: 0 4px 12px rgba(26, 42, 58, 0.06);
}

.category-icon {
  font-size: 1.25rem;
  line-height: 1;
}

.category-name {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #1a2a3a;
}

.faq-list {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem 2rem;
}

.faq-group {
  margin-bottom: 2rem;
}

.faq-group-title {
  font-size: 1.125rem;
  margin-bottom: 0.875rem;
  padding-bottom: 0.375rem;
  border-bottom: 2px solid #e67e22;
  display: inline-block;
}

.faq-item {
  background-color: #ffffff;
  border: 1px solid #e8ecef;
  border-radius: 6px;
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.faq-item summary {
  padding: 1rem 1.25rem;
  font-weight: 600;
  font-size: 0.9375rem;
  color: #1a2a3a;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 44px;
  transition: background-color 0.2s ease;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 1.25rem;
  color: #e67e22;
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

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

.faq-item summary:hover {
  background-color: #f8f9fb;
}

.faq-item p {
  padding: 0 1.25rem 1rem;
  margin: 0;
  font-size: 0.9375rem;
  color: #4a5561;
  line-height: 1.75;
}

.faq-related-links {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem 3rem;
}

.faq-related-links > p {
  font-size: 0.9375rem;
  color: #4a5561;
  max-width: 720px;
}

.related-link-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.625rem;
}

.related-link-list li {
  margin: 0;
}

.related-link-list a {
  display: block;
  padding: 0.75rem 1rem;
  background-color: #ffffff;
  border: 1px solid #e8ecef;
  border-radius: 6px;
  font-size: 0.875rem;
  color: #1a2a3a;
  min-height: 44px;
  line-height: 1.6;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.related-link-list a:hover {
  border-color: #e67e22;
  box-shadow: 0 4px 12px rgba(26, 42, 58, 0.06);
}

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

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem 1rem;
  min-height: 60vh;
}

.error-section {
  text-align: center;
  max-width: 520px;
  background-color: #ffffff;
  border: 1px solid #e8ecef;
  border-radius: 8px;
  padding: 3rem 2.5rem;
}

.error-code {
  font-family: Georgia, "Times New Roman", "Songti SC", SimSun, serif;
  font-size: 4rem;
  font-weight: 700;
  color: #e67e22;
  margin-bottom: 0.5rem;
  line-height: 1;
}

.error-section h1 {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}

.error-desc {
  font-size: 0.9375rem;
  color: #4a5561;
  margin-bottom: 1.5rem;
}

.error-home-btn {
  display: inline-block;
  padding: 0.625rem 1.5rem;
  background-color: #1a2a3a;
  color: #ffffff;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.9375rem;
  min-height: 44px;
  line-height: 2.4;
  transition: background-color 0.2s ease;
}

.error-home-btn:hover {
  background-color: #e67e22;
  color: #ffffff;
}

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

@media (max-width: 992px) {
  .hero-section .hero-copy {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

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

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

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

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

  .recommend-grid .recommend-card:last-child {
    grid-column: 1 / -1;
  }

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

  .guide-layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .guide-related {
    position: static;
  }

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

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: 1.625rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  .header-inner {
    flex-wrap: wrap;
    min-height: 56px;
    padding-top: 0.375rem;
    padding-bottom: 0.375rem;
  }

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

  .brand {
    order: 1;
  }

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

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    padding: 0.5rem 0;
    gap: 0;
  }

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

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

  .nav-list a {
    padding: 0.75rem 0.5rem;
    border-radius: 4px;
  }

  .hero-section {
    padding: 2rem 1rem;
  }

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

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

  .focus-report-grid {
    grid-template-columns: 1fr;
  }

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

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

  .pick-link {
    flex-direction: column;
    gap: 0.25rem;
  }

  .pick-title {
    min-width: 0;
  }

  .topic-item {
    grid-template-columns: 1fr;
  }

  .topic-media img {
    height: 200px;
  }

  .topic-articles {
    padding-left: 0;
  }

  .faq-list {
    padding-bottom: 1.5rem;
  }

  .faq-related-links {
    padding-bottom: 2rem;
  }

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

@media (max-width: 640px) {
  .channel-grid {
    grid-template-columns: 1fr;
  }

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

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

  .recommend-grid .recommend-card:last-child {
    grid-column: auto;
  }

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

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding-top: 2rem;
  }

  .footer-col {
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding-bottom: 1.25rem;
  }

  .footer-col:last-child {
    border-bottom: 0;
    padding-bottom: 0;
  }

  .footer-bottom {
    padding: 1rem 0.75rem;
  }

  .page-header {
    padding: 1.25rem 1rem 1.5rem;
  }

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

  .guide-section {
    padding: 1.25rem 1.25rem;
  }

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

  .content-media-inline img {
    height: 200px;
  }

  .error-section {
    padding: 2rem 1.5rem;
  }

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

  .topic-item {
    padding: 1rem;
  }

  .topic-media img {
    height: 160px;
  }

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

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

@media (max-width: 390px) {
  .header-inner {
    padding: 0 0.75rem;
  }

  .brand-name {
    font-size: 1.125rem;
  }

  .brand-slogan {
    font-size: 0.6875rem;
  }

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

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

  .focus-report-body {
    padding: 1rem 1.125rem 1.25rem;
  }

  .focus-report-media img {
    height: 170px;
  }

  .topic-body {
    padding: 1rem 1.125rem 1.25rem;
  }

  .topic-media img {
    height: 150px;
  }

  .guide-section {
    padding: 1rem;
  }

  .guide-section h2 {
    font-size: 1.25rem;
  }

  .faq-item summary {
    padding: 0.875rem 1rem;
  }

  .faq-item p {
    padding: 0 1rem 0.875rem;
  }

  .footer-inner {
    padding-left: 0.75rem;
    padding-right: 0.75rem;
  }
}