/* ==========================================================================
   base — 基础变量、reset、全局排版
   ========================================================================== */
:root {
  --color-primary: #FF6B35;
  --color-primary-dark: #E85D2A;
  --color-primary-light: #FFF3E9;
  --color-accent: #2563EB;
  --color-accent-light: #EFF4FF;
  --color-bg: #FAFAF7;
  --color-text: #1F2937;
  --color-text-light: #6B7280;
  --color-border: #E5E7EB;
  --color-white: #FFFFFF;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --container-width: 1160px;
  --font-stack: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  --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-stack);
  background-color: var(--color-bg);
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  color: var(--color-text);
}

h2 {
  font-size: 22px;
  font-weight: 700;
}

h3 {
  font-size: 17px;
  font-weight: 600;
}

p {
  margin-bottom: 0.5em;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  font-size: 14px;
}

table {
  border-collapse: collapse;
  width: 100%;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

/* ==========================================================================
   layout — 全站统一外壳
   ========================================================================== */
.site-header {
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 20px;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 22px;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: 0;
}

.brand-tagline {
  font-size: 12px;
  color: var(--color-text-light);
  display: none;
}

.site-nav .nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav .nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}

.site-nav .nav-list a:hover {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

.site-nav .nav-list a.is-current {
  color: var(--color-primary);
  background: var(--color-primary-light);
  font-weight: 600;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: var(--radius-sm);
}

.nav-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

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

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 18px 0 4px;
  font-size: 13px;
  color: var(--color-text-light);
}

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

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

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

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

.page-header {
  padding: 18px 0 26px;
}

.page-title {
  font-size: 30px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 8px;
}

.page-description {
  font-size: 15px;
  color: var(--color-text-light);
  max-width: 760px;
  line-height: 1.7;
}

/* 页脚 */
.site-footer {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  margin-top: 60px;
}

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

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--color-border);
}

.footer-brand-name {
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 8px;
}

.footer-brand-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0;
}

.footer-title {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 12px;
}

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

.footer-links a {
  font-size: 13px;
  color: var(--color-text-light);
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  padding-top: 18px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* 相关任务带（首页与部分内页共用） */
.task-belt {
  margin: 50px 0 0;
}

.task-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.task-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  transition: box-shadow var(--transition), border-color var(--transition);
}

.task-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(31, 41, 55, 0.06);
}

.task-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  font-size: 20px;
  font-weight: 700;
}

.task-title,
.task-name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--color-text);
}

.task-desc {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 0;
  line-height: 1.5;
}

.task-btn {
  margin-left: auto;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  white-space: nowrap;
}

.task-link {
  display: inline-block;
  margin-top: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

.task-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.task-text strong {
  font-size: 16px;
  font-weight: 700;
}

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

/* 相关链接导航 */
.related-links {
  max-width: var(--container-width);
  margin: 18px auto 0;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 13px;
}

.related-links-label {
  color: var(--color-text-light);
}

.related-links-item {
  color: var(--color-accent);
  font-weight: 500;
}

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

/* 通用区块标题 */
.section-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 6px;
}

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

.section-intro {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}

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

/* ==========================================================================
   components — 通用组件
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  min-height: 44px;
}

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

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

.btn-secondary {
  background-color: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.btn-secondary:hover {
  background-color: var(--color-accent-light);
  color: var(--color-accent);
}

/* 频道标签通用样式 */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* 折叠项 */
details {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

summary {
  cursor: pointer;
  padding: 14px 18px;
  font-size: 15px;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "＋";
  font-size: 16px;
  color: var(--color-text-light);
  flex-shrink: 0;
  transition: transform var(--transition);
}

details[open] summary::after {
  transform: rotate(45deg);
}

/* 任务带（内页变体） */
.task-strip {
  max-width: var(--container-width);
  margin: 48px auto 0;
  padding: 0 20px;
}

.task-strip-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 14px;
}

.task-strip .task-card {
  margin-bottom: 12px;
}

/* ==========================================================================
   pages — 首页
   ========================================================================== */
.home-main {
  overflow: clip;
}

/* 首屏 hero */
.hero-section {
  background-color: var(--color-bg);
  padding: 40px 0 52px;
}

.hero-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
}

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

.hero-title {
  font-size: 32px;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 12px;
}

.hero-lead {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.hero-desc {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 20px;
  line-height: 1.7;
}

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

.hero-explorer {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  min-width: 0;
}

.explorer-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 14px;
}

.topic-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.topic-btn {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  background: var(--color-primary-light);
  color: var(--color-text);
  transition: background var(--transition), color var(--transition);
}

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

.topic-btn.is-active {
  background: var(--color-primary);
  color: var(--color-white);
}

.dimension-preview {
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.dimension-row {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
}

.dimension-label {
  color: var(--color-text-light);
  flex-shrink: 0;
  min-width: 68px;
  font-weight: 500;
}

.dimension-value {
  color: var(--color-text);
  font-weight: 600;
}

.hero-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-primary-light);
}

.hero-figure img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

/* 频道标签带 */
.channel-belt {
  padding: 40px 0 20px;
}

.belt-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

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

.belt-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.belt-item:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 16px rgba(31, 41, 55, 0.06);
}

.belt-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
}

.belt-tagline {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.5;
  flex: 1;
}

.belt-arrow {
  font-size: 14px;
  color: var(--color-primary);
  font-weight: 600;
}

/* 精选专题卡 */
.featured-cards {
  padding: 30px 0;
}

.cards-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

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

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

.feature-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 6px 20px rgba(31, 41, 55, 0.08);
}

.card-link {
  display: block;
  color: inherit;
}

.card-link:hover {
  color: inherit;
}

.card-figure {
  overflow: hidden;
  background: var(--color-primary-light);
}

.card-figure img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.feature-card:hover .card-figure img {
  transform: scale(1.03);
}

.card-body {
  padding: 16px 18px 18px;
}

.card-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

.card-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 4px;
}

.card-age {
  font-size: 13px;
  color: var(--color-accent);
  margin-bottom: 6px;
  font-weight: 500;
}

.card-reason {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 片单双栏区 */
.playlist-index {
  padding: 30px 0;
}

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

.index-column {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  min-width: 0;
}

.column-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}

.column-desc {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 14px;
  line-height: 1.6;
}

.playlist-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.item-no {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-primary);
  flex-shrink: 0;
  width: 24px;
}

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

.item-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  display: block;
  line-height: 1.4;
}

.item-meta {
  font-size: 12px;
  color: var(--color-text-light);
}

.item-controls {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.move-up,
.move-down {
  width: 30px;
  height: 30px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 14px;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), color var(--transition);
}

.move-up:hover,
.move-down:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.archive-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

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

.archive-cat {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  flex-shrink: 0;
}

.archive-dir {
  font-size: 13px;
  color: var(--color-text-light);
  flex: 1;
  min-width: 0;
}

.archive-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  white-space: nowrap;
}

.column-link {
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
}

/* 观看帮助 */
.watch-help {
  padding: 30px 0;
}

.help-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

.help-accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.help-item {
  background: var(--color-white);
}

.help-summary {
  font-size: 15px;
  font-weight: 600;
  padding: 14px 18px;
}

.help-content {
  padding: 0 18px 16px;
}

.help-content p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 6px;
}

/* ==========================================================================
   pages — 频道总览 dhpdm/channels.html
   ========================================================================== */
.layout-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

.page-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 32px;
  align-items: start;
}

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

.channels-hero-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 28px;
  background: var(--color-primary-light);
}

.channels-hero-figure img {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.channels-hero-figure figcaption {
  font-size: 13px;
  color: var(--color-text-light);
  padding: 10px 14px;
  background: var(--color-white);
}

.channel-groups {
  margin-bottom: 36px;
}

.channel-group {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  margin-bottom: 18px;
  scroll-margin-top: 84px;
}

.group-heading {
  margin-bottom: 14px;
}

.group-heading h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 4px;
}

.group-heading p {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 0;
}

.group-media {
  margin: 0 0 16px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--color-primary-light);
}

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

.group-channels {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.channel-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 14px;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}

.channel-row:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.channel-thumb {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-light);
  overflow: hidden;
  flex-shrink: 0;
}

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

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

.channel-name {
  font-size: 15px;
  font-weight: 600;
  display: block;
  margin-bottom: 2px;
}

.channel-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.5;
  margin-bottom: 0;
}

.channel-info .tag-list {
  margin-top: 6px;
}

.age-range {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.channel-position-cards {
  margin-bottom: 40px;
}

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

.position-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.position-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.position-card p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* 侧栏 */
.sidebar {
  min-width: 0;
}

.sidebar-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  margin-bottom: 18px;
}

.sidebar-card h2 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
}

.quick-index {
  margin-bottom: 14px;
}

.quick-index:last-child {
  margin-bottom: 0;
}

.quick-index h3 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--color-border);
}

.quick-links li {
  margin-bottom: 6px;
}

.quick-links a {
  font-size: 13px;
  color: var(--color-text);
  display: inline-block;
  padding: 3px 0;
}

.quick-links a:hover {
  color: var(--color-primary);
}

/* ==========================================================================
   pages — 片单排期 dhpdm/schedule.html
   ========================================================================== */
.schedule-overview {
  margin-bottom: 32px;
}

.overview-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 12px;
  background: var(--color-primary-light);
}

.overview-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.overview-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 0;
}

.weekly-schedule {
  margin-bottom: 36px;
}

.schedule-table {
  width: 100%;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.schedule-table th,
.schedule-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
  vertical-align: middle;
}

.schedule-table thead th {
  background: var(--color-primary-light);
  font-weight: 700;
  font-size: 13px;
  color: var(--color-text);
  white-space: nowrap;
}

.schedule-table tbody tr:last-child td {
  border-bottom: none;
}

.schedule-table tbody tr:hover {
  background: var(--color-bg);
}

.schedule-table a {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
}

.playlist-details {
  margin-bottom: 36px;
}

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

.detail-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: border-color var(--transition);
}

.detail-card:hover {
  border-color: var(--color-primary);
}

.detail-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}

.tag-line {
  font-size: 13px;
  color: var(--color-accent);
  font-weight: 500;
  margin-bottom: 8px;
}

.detail-card p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 4px;
}

.watch-time-suggestions {
  margin-bottom: 40px;
}

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

.time-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.time-card h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.time-card p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 4px;
}

/* ==========================================================================
   pages — 经典资料 dhpdm/classics.html
   ========================================================================== */
.timeline-section {
  margin-bottom: 40px;
}

.timeline-era {
  position: relative;
  padding: 0 0 24px 24px;
  border-left: 2px solid var(--color-primary-light);
  margin-left: 8px;
}

.timeline-era::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-primary);
}

.era-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.era-title {
  font-size: 18px;
  font-weight: 700;
}

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

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

.archive-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.archive-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 14px rgba(31, 41, 55, 0.05);
}

.archive-card h3,
.archive-card h4 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 10px;
}

.archive-field {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 6px;
}

.archive-field strong {
  color: var(--color-text);
  font-weight: 600;
  margin-right: 4px;
}

.archive-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  margin: 4px 6px 0 0;
}

.timeline-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 20px 0 0;
  background: var(--color-primary-light);
}

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

.timeline-figure figcaption {
  font-size: 13px;
  color: var(--color-text-light);
  padding: 10px 14px;
  background: var(--color-white);
}

.archive-detail-section {
  margin-bottom: 40px;
}

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

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

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

.dimension-item {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.dimension-name {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-accent);
}

.dimension-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* ==========================================================================
   pages — 榜单记录 dhpdm/charts.html
   ========================================================================== */
.top-card-section {
  margin-bottom: 40px;
}

.top-card-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 0;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  align-items: stretch;
}

.top-card-content {
  padding: 26px 28px;
  min-width: 0;
}

.top-badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--color-white);
  background: var(--color-primary);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.top-card-title {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 8px;
}

.top-card-desc {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 14px;
}

.top-reasons {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.top-reasons li {
  font-size: 13px;
  color: var(--color-text);
  padding-left: 18px;
  position: relative;
  line-height: 1.6;
}

.top-reasons li::before {
  content: "·";
  position: absolute;
  left: 4px;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 16px;
}

.top-card-media {
  min-height: 100%;
  background: var(--color-primary-light);
}

.top-card-media img {
  width: 100%;
  height: 100%;
  min-height: 240px;
  object-fit: cover;
}

.charts-list-section {
  margin-bottom: 40px;
}

.charts-group {
  margin-bottom: 24px;
}

.group-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-primary-light);
}

.chart-item {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-bottom: 8px;
  transition: border-color var(--transition), background var(--transition);
}

.chart-item:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.chart-tag {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  white-space: nowrap;
}

.chart-desc {
  font-size: 14px;
  color: var(--color-text);
  flex: 1;
  min-width: 0;
  line-height: 1.5;
  margin-bottom: 0;
}

.chart-reason {
  font-size: 13px;
  color: var(--color-text-light);
  flex-shrink: 0;
  max-width: 220px;
  text-align: right;
  line-height: 1.5;
}

.charts-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 20px;
  background: var(--color-primary-light);
}

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

/* ==========================================================================
   pages — 观看指南 dhpdm/guide.html
   ========================================================================== */
.guide-layout {
  grid-template-columns: 1fr 320px;
  gap: 32px;
  align-items: start;
}

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

.guide-steps {
  margin-bottom: 24px;
}

.guide-step-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.guide-step-card {
  display: flex;
  gap: 16px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  transition: border-color var(--transition);
}

.guide-step-card:hover {
  border-color: var(--color-primary);
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
}

.step-content {
  flex: 1;
  min-width: 0;
}

.step-content h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}

.step-content p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

.step-points {
  padding-left: 18px;
}

.step-points li {
  font-size: 13px;
  color: var(--color-text);
  line-height: 1.6;
  padding: 2px 0;
  position: relative;
}

.step-points li::before {
  content: "·";
  position: absolute;
  left: -14px;
  color: var(--color-primary);
  font-weight: 700;
}

.guide-steps-media {
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 20px;
  background: var(--color-primary-light);
}

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

.guide-steps-media figcaption {
  font-size: 13px;
  color: var(--color-text-light);
  padding: 10px 14px;
  background: var(--color-white);
}

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

.checklist-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  margin-bottom: 18px;
}

.checklist-card h2 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 4px;
}

.checklist-intro {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 12px;
}

.checklist-list {
  counter-reset: checklist;
}

.checklist-list li {
  counter-increment: checklist;
  font-size: 13px;
  color: var(--color-text);
  padding: 6px 0 6px 30px;
  position: relative;
  line-height: 1.6;
}

.checklist-list li::before {
  content: counter(checklist);
  position: absolute;
  left: 0;
  top: 6px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 12px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.time-suggest-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 22px;
}

.time-suggest-card h2 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 12px;
}

.time-suggest-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}

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

.time-suggest-list h3 {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.time-suggest-list p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.6;
  margin-bottom: 0;
}

/* ==========================================================================
   pages — 常见问题 dhpdm/faq.html
   ========================================================================== */
.faq-categories {
  margin-bottom: 24px;
}

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

.category-tag {
  display: inline-block;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.category-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.category-tag.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

.faq-columns {
  margin-bottom: 36px;
}

.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
}

.faq-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.faq-item summary {
  font-size: 14px;
  font-weight: 600;
  padding: 14px 18px;
}

.faq-item p {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.7;
  padding: 0 18px 14px;
  margin-bottom: 0;
}

.feedback-path {
  margin-bottom: 40px;
}

.feedback-path-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 20px;
  align-items: center;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.feedback-media {
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--color-primary-light);
}

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

.feedback-steps {
  min-width: 0;
}

.feedback-step-list {
  counter-reset: feedback;
}

.feedback-step-list li {
  counter-increment: feedback;
  font-size: 14px;
  color: var(--color-text);
  padding: 8px 0 8px 36px;
  position: relative;
  line-height: 1.6;
}

.feedback-step-list li::before {
  content: counter(feedback);
  position: absolute;
  left: 0;
  top: 8px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feedback-step-list strong {
  font-weight: 700;
  color: var(--color-text);
  margin-right: 4px;
}

.related-tasks {
  margin: 40px 0 0;
}

.task-card-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.task-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.task-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 4px 14px rgba(31, 41, 55, 0.05);
}

.task-card-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
}

.task-card-desc {
  font-size: 13px;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* ==========================================================================
   pages — 404
   ========================================================================== */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  min-height: 60vh;
}

.error-panel {
  text-align: center;
  max-width: 520px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 40px 36px;
}

.error-title {
  font-size: 48px;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.error-lead {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
}

.error-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 18px;
  flex-wrap: wrap;
}

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

.error-help a {
  margin: 0 6px;
  font-weight: 500;
}

/* ==========================================================================
   responsive — 响应式断点
   ========================================================================== */
/* 1024px */
@media (max-width: 1024px) {
  .hero-shell {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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

  .page-layout {
    grid-template-columns: 1fr 260px;
    gap: 24px;
  }

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

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

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

  .chart-reason {
    max-width: 160px;
  }
}

/* 768px */
@media (max-width: 768px) {
  .header-shell {
    min-height: 60px;
  }

  .brand-tagline {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

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

  .site-nav .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 12px;
  }

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

  .site-nav .nav-list a {
    padding: 10px 14px;
    border-radius: var(--radius-sm);
  }

  .header-shell {
    flex-wrap: wrap;
  }

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

  .sidebar {
    order: 2;
  }

  .guide-aside {
    order: 2;
  }

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

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

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

  .footer-top {
    grid-template-columns: 1fr;
    gap: 24px;
  }

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

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

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

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

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

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

  .top-card-media img {
    height: 200px;
    min-height: auto;
  }

  .chart-item {
    flex-wrap: wrap;
  }

  .chart-reason {
    max-width: none;
    text-align: left;
    flex-basis: 100%;
    padding-left: 0;
  }

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

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

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

  .task-shell {
    grid-template-columns: 1fr;
  }

  .task-card {
    flex-wrap: wrap;
  }

  .task-btn {
    margin-left: 0;
  }

  .schedule-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  .schedule-table thead,
  .schedule-table tbody,
  .schedule-table tr,
  .schedule-table th,
  .schedule-table td {
    display: block;
  }

  .schedule-table thead {
    display: none;
  }

  .schedule-table tbody tr {
    border-bottom: 1px solid var(--color-border);
    padding: 10px 0;
  }

  .schedule-table tbody tr:last-child {
    border-bottom: none;
  }

  .schedule-table td {
    border-bottom: none;
    padding: 6px 14px;
    font-size: 14px;
  }

  .schedule-table td::before {
    content: attr(data-label);
    display: inline-block;
    font-weight: 700;
    margin-right: 8px;
    font-size: 12px;
    color: var(--color-text-light);
  }
}

/* 480px */
@media (max-width: 480px) {
  .header-shell {
    padding: 0 14px;
  }

  .inner-main {
    padding: 0 14px;
  }

  .hero-shell {
    padding: 0 14px;
  }

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

  .btn {
    width: 100%;
  }

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

  .cards-grid {
    gap: 14px;
  }

  .card-figure img {
    height: 160px;
  }

  .index-column {
    padding: 16px 16px;
  }

  .playlist-item {
    flex-wrap: wrap;
  }

  .item-controls {
    width: 100%;
    justify-content: flex-end;
  }

  .archive-item {
    flex-wrap: wrap;
  }

  .archive-link {
    margin-left: auto;
  }

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

  .category-tag-list {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 6px;
  }

  .category-tag {
    flex-shrink: 0;
  }

  .guide-step-card {
    flex-direction: column;
    gap: 12px;
  }

  .step-number {
    width: 36px;
    height: 36px;
    font-size: 15px;
  }

  .task-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .task-icon {
    width: 38px;
    height: 38px;
  }

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

  .footer-shell {
    padding: 30px 14px 16px;
  }

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

  .error-title {
    font-size: 40px;
  }

  .timeline-era {
    padding-left: 18px;
  }

  .era-header {
    flex-direction: column;
    gap: 2px;
  }

  .top-card-content {
    padding: 20px;
  }

  .top-card-title {
    font-size: 18px;
  }

  .feedback-path-layout {
    padding: 14px;
  }

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