/* ============================================================
   base / reset & tokens
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  color: #333333;
  background-color: #f5f5f5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  border: 0;
}

a {
  color: #1a1a1a;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #d4a800;
}

ul, ol {
  list-style: none;
}

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

h1, h2, h3, h4 {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #1a1a1a;
  line-height: 1.35;
  font-weight: 700;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.25rem;
}

p {
  margin-bottom: 1rem;
}

time {
  color: #888888;
  font-size: 0.875rem;
}

/* ============================================================
   layout / shared shell
   ============================================================ */
.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  background-color: #1a1a1a;
  border-bottom: 3px solid #ffcc00;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
  flex-shrink: 0;
}

.brand-name {
  font-size: 1.375rem;
  font-weight: 800;
  color: #ffcc00;
  letter-spacing: 0.02em;
}

.brand-slogan {
  font-size: 0.75rem;
  color: #cccccc;
  white-space: nowrap;
}

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

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

.nav-list a {
  display: block;
  padding: 8px 16px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: #f0f0f0;
  border-radius: 4px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav-list a:hover {
  color: #1a1a1a;
  background-color: #ffcc00;
}

.nav-list a.is-current {
  color: #1a1a1a;
  background-color: #ffcc00;
  font-weight: 700;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border: 1px solid #444444;
  border-radius: 6px;
  background-color: #222222;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background-color: #ffcc00;
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

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

.inner-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

/* breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: #888888;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: #666666;
  transition: color 0.2s ease;
}

.breadcrumb a:hover {
  color: #1a1a1a;
}

.breadcrumb-sep {
  color: #bbbbbb;
  user-select: none;
}

.breadcrumb-current {
  color: #1a1a1a;
  font-weight: 600;
}

/* page header */
.page-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 2px solid #e0e0e0;
}

.page-title {
  font-size: 2rem;
  font-weight: 800;
  color: #1a1a1a;
  margin-bottom: 8px;
}

.page-description {
  font-size: 1rem;
  color: #666666;
  max-width: 780px;
  margin-bottom: 0;
}

/* footer */
.site-footer {
  background-color: #1a1a1a;
  color: #cccccc;
  margin-top: 0;
}

.footer-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 20px 32px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
}

.footer-col__title {
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 16px;
}

.footer-brand {
  font-size: 1.25rem;
  font-weight: 800;
  color: #ffcc00;
  margin-bottom: 8px;
}

.footer-desc {
  font-size: 0.875rem;
  line-height: 1.8;
  color: #999999;
  margin-bottom: 0;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  font-size: 0.875rem;
  color: #bbbbbb;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #ffcc00;
}

.footer-info {
  font-size: 0.875rem;
  line-height: 1.8;
  color: #999999;
  margin-bottom: 0;
}

.footer-bottom {
  border-top: 1px solid #2a2a2a;
  padding: 16px 20px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: #777777;
  margin-bottom: 0;
}

/* ============================================================
   components / shared
   ============================================================ */
.section-desc {
  font-size: 0.9375rem;
  color: #666666;
  margin-bottom: 0;
}

/* topic card (used on index & topics) */
.topic-card {
  background-color: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid #e8e8e8;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.topic-card:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

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

.topic-card__content,
.topic-card__body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1 0 auto;
}

.topic-card__content h3,
.topic-card__body h3 {
  font-size: 1.125rem;
  line-height: 1.4;
}

.topic-card__content h3 a,
.topic-card__body h3 a {
  color: #1a1a1a;
  transition: color 0.2s ease;
}

.topic-card__content h3 a:hover,
.topic-card__body h3 a:hover {
  color: #d4a800;
}

.topic-card__desc,
.topic-card__body p {
  font-size: 0.875rem;
  color: #666666;
  line-height: 1.7;
  margin-bottom: 0;
  flex: 1 0 auto;
}

.topic-card__link {
  margin-top: 12px;
  font-size: 0.875rem;
  font-weight: 600;
  color: #1a1a1a;
  border-bottom: 2px solid #ffcc00;
  padding-bottom: 2px;
  align-self: flex-start;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.topic-card__link:hover {
  color: #d4a800;
  border-color: #d4a800;
}

/* ============================================================
   components / homepage
   ============================================================ */
.home-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 64px;
}

/* hero focus */
.hero-focus {
  padding: 32px 0 8px;
}

.hero-focus__grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 32px;
  align-items: stretch;
}

.hero-focus__media {
  background-color: #1a1a1a;
  border-radius: 8px;
  overflow: hidden;
}

.hero-figure {
  width: 100%;
  height: 100%;
}

.hero-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}

.hero-focus__content {
  background-color: #1a1a1a;
  border-radius: 8px;
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  border-left: 6px solid #ffcc00;
}

.hero-focus__content h1 {
  font-size: 2.25rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-focus__summary {
  font-size: 1rem;
  color: #cccccc;
  line-height: 1.8;
  margin-bottom: 24px;
}

.hero-focus__link {
  display: inline-block;
  padding: 10px 24px;
  background-color: #ffcc00;
  color: #1a1a1a;
  font-weight: 700;
  font-size: 0.9375rem;
  border-radius: 6px;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.hero-focus__link:hover {
  background-color: #e6b800;
  color: #1a1a1a;
  transform: translateY(-1px);
}

/* channel index */
.channel-index {
  margin-top: 40px;
  background-color: #ffffff;
  border-radius: 8px;
  border: 1px solid #e8e8e8;
  padding: 28px;
}

.channel-index__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 2px solid #f0f0f0;
}

.channel-index__head h2 {
  font-size: 1.375rem;
  margin-bottom: 0;
  position: relative;
  padding-left: 14px;
}

.channel-index__head h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 22px;
  background-color: #ffcc00;
  border-radius: 2px;
}

.channel-index__list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.channel-item a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 20px;
  background-color: #fafafa;
  border-radius: 6px;
  border: 1px solid #eeeeee;
  transition: background-color 0.2s ease, border-color 0.2s ease;
  height: 100%;
}

.channel-item a:hover {
  background-color: #fffdf0;
  border-color: #ffcc00;
}

.channel-item__name {
  font-size: 1rem;
  font-weight: 700;
  color: #1a1a1a;
  display: flex;
  align-items: center;
  gap: 8px;
}

.channel-item__name::before {
  content: "";
  width: 8px;
  height: 8px;
  background-color: #ffcc00;
  border-radius: 2px;
  flex-shrink: 0;
}

.channel-item__desc {
  font-size: 0.8125rem;
  color: #888888;
  line-height: 1.6;
}

/* latest list */
.latest-list {
  margin-top: 40px;
}

.latest-list__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 2px solid #e0e0e0;
}

.latest-list__head h2 {
  font-size: 1.375rem;
  margin-bottom: 0;
  position: relative;
  padding-left: 14px;
}

.latest-list__head h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 22px;
  background-color: #ffcc00;
  border-radius: 2px;
}

.latest-list__items {
  display: flex;
  flex-direction: column;
}

.latest-item {
  border-bottom: 1px solid #e8e8e8;
}

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

.latest-item__article {
  padding: 20px 4px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: baseline;
}

.latest-item__article h3 {
  font-size: 1.0625rem;
  margin-bottom: 6px;
  grid-column: 1;
}

.latest-item__article h3 a {
  color: #1a1a1a;
  transition: color 0.2s ease;
}

.latest-item__article h3 a:hover {
  color: #d4a800;
}

.latest-item__summary {
  font-size: 0.875rem;
  color: #777777;
  line-height: 1.7;
  margin-bottom: 0;
  grid-column: 1;
}

.latest-item__article time {
  grid-column: 2;
  grid-row: 1;
  white-space: nowrap;
  font-size: 0.8125rem;
}

/* topics */
.topics {
  margin-top: 40px;
}

.topics__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 2px solid #e0e0e0;
}

.topics__head h2 {
  font-size: 1.375rem;
  margin-bottom: 0;
  position: relative;
  padding-left: 14px;
}

.topics__head h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 22px;
  background-color: #ffcc00;
  border-radius: 2px;
}

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

/* editor picks */
.editor-picks {
  margin-top: 40px;
  background-color: #1a1a1a;
  border-radius: 8px;
  padding: 32px;
}

.editor-picks__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid #2a2a2a;
}

.editor-picks__head h2 {
  font-size: 1.375rem;
  margin-bottom: 0;
  color: #ffffff;
  position: relative;
  padding-left: 14px;
}

.editor-picks__head h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 22px;
  background-color: #ffcc00;
  border-radius: 2px;
}

.editor-picks__head .section-desc {
  color: #999999;
}

.editor-picks__list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.editor-pick-item {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  align-items: start;
  background-color: #222222;
  border-radius: 6px;
  padding: 20px 24px;
  transition: background-color 0.2s ease;
}

.editor-pick-item:hover {
  background-color: #2a2a2a;
}

.editor-pick-item__number {
  font-size: 1.75rem;
  font-weight: 800;
  color: #ffcc00;
  line-height: 1;
  padding-top: 2px;
}

.editor-pick-item__content h3 {
  font-size: 1.0625rem;
  margin-bottom: 6px;
}

.editor-pick-item__content h3 a {
  color: #ffffff;
  transition: color 0.2s ease;
}

.editor-pick-item__content h3 a:hover {
  color: #ffcc00;
}

.editor-pick-item__summary {
  font-size: 0.875rem;
  color: #aaaaaa;
  line-height: 1.7;
  margin-bottom: 0;
}

/* feedback */
.feedback {
  margin-top: 40px;
  background-color: #ffcc00;
  border-radius: 8px;
  padding: 36px 32px;
}

.feedback__inner {
  max-width: 760px;
}

.feedback__inner h2 {
  font-size: 1.375rem;
  color: #1a1a1a;
  margin-bottom: 12px;
}

.feedback__inner p {
  font-size: 0.9375rem;
  color: #3a3a3a;
  margin-bottom: 8px;
}

.feedback__inner p:last-of-type {
  margin-bottom: 20px;
}

.feedback__link {
  display: inline-block;
  padding: 10px 28px;
  background-color: #1a1a1a;
  color: #ffffff;
  font-weight: 600;
  font-size: 0.9375rem;
  border-radius: 6px;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.feedback__link:hover {
  background-color: #333333;
  color: #ffffff;
  transform: translateY(-1px);
}

/* ============================================================
   components / channels page
   ============================================================ */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.channel-card {
  background-color: #ffffff;
  border-radius: 8px;
  border: 1px solid #e8e8e8;
  overflow: hidden;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.channel-card:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.channel-card__media {
  overflow: hidden;
}

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

.channel-card__body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1 0 auto;
}

.channel-card__title {
  font-size: 1.25rem;
  margin-bottom: 4px;
}

.channel-card__desc {
  font-size: 0.875rem;
  color: #666666;
  line-height: 1.7;
  margin-bottom: 16px;
  flex: 1 0 auto;
}

.channel-card__link {
  font-size: 0.875rem;
  font-weight: 600;
  color: #1a1a1a;
  border-bottom: 2px solid #ffcc00;
  padding-bottom: 2px;
  align-self: flex-start;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.channel-card__link:hover {
  color: #d4a800;
  border-color: #d4a800;
}

.channel-notes {
  background-color: #ffffff;
  border-radius: 8px;
  border: 1px solid #e8e8e8;
  padding: 32px;
}

.channel-notes h2 {
  font-size: 1.25rem;
  margin-bottom: 16px;
  position: relative;
  padding-left: 14px;
}

.channel-notes h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 22px;
  background-color: #ffcc00;
  border-radius: 2px;
}

.channel-notes p {
  font-size: 0.9375rem;
  color: #555555;
  line-height: 1.8;
  margin-bottom: 12px;
}

.channel-notes p:last-child {
  margin-bottom: 0;
}

/* ============================================================
   components / topics page
   ============================================================ */
.topic-list {
  margin-bottom: 48px;
}

.topic-list > h2 {
  font-size: 1.25rem;
  margin-bottom: 20px;
  position: relative;
  padding-left: 14px;
}

.topic-list > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 22px;
  background-color: #ffcc00;
  border-radius: 2px;
}

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

.topic-card__media {
  overflow: hidden;
}

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

.topic-detail-entry {
  background-color: #ffffff;
  border-radius: 8px;
  border: 1px solid #e8e8e8;
  padding: 32px;
  margin-bottom: 48px;
}

.topic-detail-entry h2 {
  font-size: 1.25rem;
  margin-bottom: 16px;
  position: relative;
  padding-left: 14px;
}

.topic-detail-entry h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 22px;
  background-color: #ffcc00;
  border-radius: 2px;
}

.entry-guide p {
  font-size: 0.9375rem;
  color: #555555;
  margin-bottom: 16px;
}

.entry-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.entry-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 16px;
  background-color: #fafafa;
  border-radius: 6px;
  border-left: 3px solid #ffcc00;
}

.entry-list a {
  font-size: 0.9375rem;
  font-weight: 600;
  color: #1a1a1a;
  transition: color 0.2s ease;
}

.entry-list a:hover {
  color: #d4a800;
}

.entry-list span {
  font-size: 0.8125rem;
  color: #999999;
  white-space: nowrap;
}

.topic-note {
  background-color: #1a1a1a;
  border-radius: 8px;
  padding: 32px;
}

.topic-note h2 {
  font-size: 1.25rem;
  color: #ffffff;
  margin-bottom: 16px;
  position: relative;
  padding-left: 14px;
}

.topic-note h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 22px;
  background-color: #ffcc00;
  border-radius: 2px;
}

.topic-note p {
  font-size: 0.9375rem;
  color: #bbbbbb;
  line-height: 1.8;
  margin-bottom: 16px;
}

.topic-note ul {
  margin-bottom: 16px;
}

.topic-note ul li {
  font-size: 0.875rem;
  color: #cccccc;
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
}

.topic-note ul li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 14px;
  width: 8px;
  height: 8px;
  background-color: #ffcc00;
  border-radius: 2px;
}

.topic-note p a {
  color: #ffcc00;
  font-weight: 600;
  margin-right: 16px;
  transition: color 0.2s ease;
}

.topic-note p a:hover {
  color: #ffffff;
}

/* ============================================================
   components / guide page
   ============================================================ */
.guide-section {
  margin-bottom: 48px;
  background-color: #ffffff;
  border-radius: 8px;
  border: 1px solid #e8e8e8;
  padding: 32px;
}

.guide-section__title {
  font-size: 1.375rem;
  margin-bottom: 16px;
  position: relative;
  padding-left: 14px;
}

.guide-section__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 24px;
  background-color: #ffcc00;
  border-radius: 2px;
}

.guide-section__intro p {
  font-size: 0.9375rem;
  color: #555555;
  line-height: 1.8;
  margin-bottom: 12px;
}

.guide-steps {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.guide-step {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  align-items: start;
  padding: 20px;
  background-color: #fafafa;
  border-radius: 6px;
  border: 1px solid #eeeeee;
}

.guide-step__mark {
  width: 40px;
  height: 40px;
  background-color: #ffcc00;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.125rem;
  font-weight: 800;
  color: #1a1a1a;
}

.guide-step__content h3 {
  font-size: 1.0625rem;
  margin-bottom: 8px;
}

.guide-step__content p {
  font-size: 0.875rem;
  color: #666666;
  line-height: 1.7;
  margin-bottom: 8px;
}

.guide-step__content p:last-child {
  margin-bottom: 0;
}

.guide-step__content a {
  color: #1a1a1a;
  font-weight: 600;
  border-bottom: 1px solid #ffcc00;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.guide-step__content a:hover {
  color: #d4a800;
  border-color: #d4a800;
}

.guide-step__media {
  margin-top: 8px;
}

.guide-step__media img {
  width: 100%;
  max-width: 640px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 6px;
}

.guide-tips {
  background-color: #fffdf0;
  border-radius: 8px;
  border: 1px solid #f0e0a0;
  padding: 24px;
  margin-top: 24px;
}

.guide-tips__list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.guide-tips__list li {
  font-size: 0.875rem;
  color: #555555;
  padding-left: 20px;
  position: relative;
}

.guide-tips__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 10px;
  width: 8px;
  height: 8px;
  background-color: #ffcc00;
  border-radius: 2px;
}

.guide-tips__media {
  margin-top: 16px;
}

.guide-tips__media img {
  width: 100%;
  max-width: 640px;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 6px;
}

/* ============================================================
   components / insight page
   ============================================================ */
.page-layout.layout-shell {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 32px;
  align-items: start;
}

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

.insight-list {
  margin-bottom: 48px;
}

.insight-list > h2 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  position: relative;
  padding-left: 14px;
}

.insight-list > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 22px;
  background-color: #ffcc00;
  border-radius: 2px;
}

.section-intro {
  font-size: 0.9375rem;
  color: #666666;
  margin-bottom: 24px;
}

.insight-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 20px;
  padding: 24px 0;
  border-bottom: 1px solid #e8e8e8;
}

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

.insight-item__media {
  overflow: hidden;
  border-radius: 6px;
}

.insight-item__media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.insight-item__body h3 {
  font-size: 1.125rem;
  margin-bottom: 8px;
}

.insight-item__body h3 a {
  color: #1a1a1a;
  transition: color 0.2s ease;
}

.insight-item__body h3 a:hover {
  color: #d4a800;
}

.insight-item__meta {
  font-size: 0.8125rem;
  color: #999999;
  margin-bottom: 8px;
}

.insight-item__body > p {
  font-size: 0.875rem;
  color: #666666;
  line-height: 1.7;
  margin-bottom: 8px;
}

.insight-item__link {
  font-size: 0.875rem;
  font-weight: 600;
  color: #1a1a1a;
  border-bottom: 2px solid #ffcc00;
  padding-bottom: 2px;
  display: inline-block;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.insight-item__link:hover {
  color: #d4a800;
  border-color: #d4a800;
}

.insight-method {
  background-color: #ffffff;
  border-radius: 8px;
  border: 1px solid #e8e8e8;
  padding: 32px;
}

.insight-method h2 {
  font-size: 1.25rem;
  margin-bottom: 16px;
  position: relative;
  padding-left: 14px;
}

.insight-method h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 22px;
  background-color: #ffcc00;
  border-radius: 2px;
}

.insight-method > p {
  font-size: 0.9375rem;
  color: #555555;
  line-height: 1.8;
  margin-bottom: 16px;
}

.method-list {
  margin-bottom: 20px;
}

.method-list li {
  font-size: 0.875rem;
  color: #555555;
  padding: 8px 0;
  padding-left: 20px;
  position: relative;
  line-height: 1.7;
}

.method-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 17px;
  width: 8px;
  height: 8px;
  background-color: #ffcc00;
  border-radius: 2px;
}

.method-list strong {
  color: #1a1a1a;
  font-weight: 700;
}

.insight-method > p:last-child a {
  color: #1a1a1a;
  font-weight: 600;
  border-bottom: 2px solid #ffcc00;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.insight-method > p:last-child a:hover {
  color: #d4a800;
  border-color: #d4a800;
}

/* sidebar */
.sidebar {
  min-width: 0;
}

.sidebar-inner {
  position: sticky;
  top: 90px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.related-box {
  background-color: #ffffff;
  border-radius: 8px;
  border: 1px solid #e8e8e8;
  padding: 24px;
}

.related-box h2 {
  font-size: 1.125rem;
  margin-bottom: 16px;
  position: relative;
  padding-left: 14px;
}

.related-box h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 4px;
  height: 20px;
  background-color: #ffcc00;
  border-radius: 2px;
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.related-list li {
  padding-bottom: 12px;
  border-bottom: 1px solid #f0f0f0;
}

.related-list li:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.related-list a {
  font-size: 0.875rem;
  color: #444444;
  line-height: 1.6;
  transition: color 0.2s ease;
}

.related-list a:hover {
  color: #d4a800;
}

/* ============================================================
   components / 404 page
   ============================================================ */
.error-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 64px 20px;
  width: 100%;
}

.error-panel {
  max-width: 640px;
  margin: 0 auto;
  background-color: #ffffff;
  border-radius: 8px;
  border: 1px solid #e8e8e8;
  padding: 48px 40px;
  text-align: center;
}

.error-code {
  font-size: 5rem;
  font-weight: 800;
  color: #ffcc00;
  line-height: 1;
  margin-bottom: 16px;
}

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

.error-desc {
  font-size: 1rem;
  color: #666666;
  margin-bottom: 12px;
}

.error-tip {
  font-size: 0.875rem;
  color: #999999;
  margin-bottom: 28px;
}

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

.error-btn {
  display: inline-block;
  padding: 12px 32px;
  background-color: #1a1a1a;
  color: #ffffff;
  font-weight: 600;
  border-radius: 6px;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.error-btn:hover {
  background-color: #333333;
  color: #ffffff;
  transform: translateY(-1px);
}

.error-link {
  font-size: 0.9375rem;
  color: #1a1a1a;
  font-weight: 600;
  border-bottom: 2px solid #ffcc00;
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.error-link:hover {
  color: #d4a800;
  border-color: #d4a800;
}

/* ============================================================
   responsive
   ============================================================ */
@media (max-width: 1024px) {
  .hero-focus__grid {
    grid-template-columns: 1fr;
  }

  .hero-focus__media {
    max-height: 340px;
  }

  .hero-focus__content {
    padding: 28px 24px;
  }

  .hero-focus__content h1 {
    font-size: 1.875rem;
  }

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

  .page-layout.layout-shell {
    grid-template-columns: 1.6fr 1fr;
    gap: 24px;
  }

  .insight-item {
    grid-template-columns: 160px 1fr;
  }
}

@media (max-width: 768px) {
  .header-shell {
    min-height: 60px;
    flex-wrap: wrap;
    padding: 8px 16px;
    gap: 8px;
  }

  .brand-slogan {
    display: none;
  }

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

  .site-nav {
    order: 3;
    width: 100%;
    margin-left: 0;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px 0 8px;
    border-top: 1px solid #2a2a2a;
  }

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

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

  .inner-main {
    padding: 24px 16px 48px;
  }

  .home-main {
    padding: 0 16px 48px;
  }

  .page-title {
    font-size: 1.625rem;
  }

  .footer-shell {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 16px 24px;
  }

  .hero-focus {
    padding: 20px 0 4px;
  }

  .hero-focus__content {
    padding: 24px 20px;
  }

  .hero-focus__content h1 {
    font-size: 1.625rem;
  }

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

  .channel-index,
  .editor-picks,
  .feedback {
    padding: 20px;
  }

  .channel-index__head,
  .latest-list__head,
  .topics__head,
  .editor-picks__head {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .latest-item__article {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .latest-item__article time {
    grid-column: 1;
    grid-row: auto;
  }

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

  .editor-pick-item {
    grid-template-columns: 40px 1fr;
    gap: 12px;
    padding: 16px;
  }

  .editor-pick-item__number {
    font-size: 1.375rem;
  }

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

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

  .topic-detail-entry,
  .topic-note,
  .guide-section,
  .insight-method {
    padding: 24px 20px;
  }

  .entry-list li {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .guide-step {
    grid-template-columns: 40px 1fr;
    gap: 12px;
    padding: 16px;
  }

  .guide-step__mark {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  .page-layout.layout-shell {
    display: flex;
    flex-direction: column;
    gap: 32px;
  }

  .sidebar-inner {
    position: static;
  }

  .insight-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .insight-item__media img {
    aspect-ratio: 16 / 9;
  }

  .error-main {
    padding: 40px 16px;
  }

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

  .error-code {
    font-size: 3.5rem;
  }

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

  .error-btn {
    text-align: center;
  }
}

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

  .hero-focus__content h1 {
    font-size: 1.375rem;
  }

  .hero-focus__summary {
    font-size: 0.875rem;
  }

  .hero-focus__link {
    padding: 10px 20px;
    font-size: 0.875rem;
  }

  .channel-item a {
    padding: 14px 16px;
  }

  .latest-item__article {
    padding: 16px 2px;
  }

  .latest-item__article h3 {
    font-size: 1rem;
  }

  .latest-item__summary {
    font-size: 0.8125rem;
  }

  .editor-pick-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .editor-pick-item__number {
    font-size: 1.125rem;
  }

  .channel-card__body,
  .topic-card__content,
  .topic-card__body {
    padding: 16px;
  }

  .guide-section {
    padding: 20px 16px;
  }

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

  .guide-step__mark {
    width: 32px;
    height: 32px;
  }
}