/* ============================================================
   可乐影视 - 整站样式表
   版本：1.0
   说明：覆盖首页、内页、导航、侧栏、列表、卡片、FAQ、页脚
   分组：base / layout / components / pages / responsive
   ============================================================ */

/* ------------------------------------------------------------
   Base - 基础变量、重置、字体、通用元素
   ------------------------------------------------------------ */
:root {
  --color-primary: #1F3A5F;
  --color-accent: #F4A261;
  --color-bg: #F7F5F0;
  --color-text: #333333;
  --color-border: #D8D5CD;
  --color-white: #ffffff;
  --color-muted: #6b6b6b;
  --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --font-num: 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --container-width: 1200px;
  --radius-card: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 2px 8px rgba(31, 58, 95, 0.06);
  --shadow-hover: 0 6px 18px rgba(31, 58, 95, 0.12);
}

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

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

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

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul,
ol {
  list-style: none;
}

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

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ------------------------------------------------------------
   Layout - 全站骨架：页头、导航、主容器、页脚
   ------------------------------------------------------------ */
.site-header {
  background-color: var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

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

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

.site-nav .nav-list a {
  display: block;
  padding: 8px 14px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.85);
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.site-nav .nav-list a:hover {
  background-color: rgba(255, 255, 255, 0.12);
  color: var(--color-white);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 8px;
  border-radius: 6px;
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s 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 {
  min-height: calc(100vh - 64px - 320px);
}

.site-footer {
  background-color: var(--color-primary);
  color: rgba(255, 255, 255, 0.8);
  margin-top: 80px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 48px;
}

.footer-site-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 8px;
}

.footer-tagline {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.6;
}

.footer-col-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 16px;
}

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

.footer-col ul a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  transition: color 0.2s ease;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding: 20px 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.5);
  max-width: var(--container-width);
  margin: 0 auto;
}

/* 内页公共骨架 */
.site-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 24px 60px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

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

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

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

.breadcrumb-current {
  color: var(--color-muted);
}

.page-header {
  margin-bottom: 40px;
}

.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
  margin-bottom: 12px;
}

.page-description {
  font-size: 16px;
  color: var(--color-muted);
  max-width: 720px;
  line-height: 1.7;
}

/* ------------------------------------------------------------
   Components - 按钮、卡片、标签、步骤、FAQ、提示框、侧栏
   ------------------------------------------------------------ */
.btn-primary {
  display: inline-block;
  padding: 12px 28px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 600;
  border-radius: 6px;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.btn-primary:hover {
  background-color: #2a4d7a;
  color: var(--color-white);
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-block;
  padding: 12px 28px;
  background-color: transparent;
  color: var(--color-primary);
  font-size: 15px;
  font-weight: 600;
  border: 2px solid var(--color-primary);
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

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

.text-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  padding: 4px 0;
  border-bottom: 2px solid var(--color-accent);
  transition: color 0.2s ease;
}

.text-link:hover {
  color: var(--color-accent);
}

/* 频道标签 */
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tag-pill {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: 14px;
  color: var(--color-primary);
  transition: border-color 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.tag-pill:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* 步骤（首页与内页共用结构，父级限定） */
.path-steps .step-item,
.feedback-steps .feedback-step {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.path-steps .step-num,
.feedback-steps .step-number,
.guide-step .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 16px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* FAQ 折叠面板 */
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background-color: var(--color-white);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: background-color 0.2s ease;
}

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

.faq-item summary::after {
  content: '+';
  font-size: 20px;
  font-weight: 400;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

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

.faq-item summary:hover {
  background-color: rgba(244, 162, 97, 0.08);
}

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

.faq-answer p {
  padding: 0;
}

/* 提示框 */
.tip-box {
  border-left: 4px solid var(--color-accent);
  background-color: rgba(244, 162, 97, 0.1);
  padding: 16px 20px;
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
  margin: 20px 0;
}

.tip-box p {
  font-size: 14px;
  line-height: 1.7;
}

.tip-box strong {
  color: var(--color-primary);
  display: block;
  margin-bottom: 4px;
}

/* 侧栏（内页通用） */
.content-side,
.sidebar-area,
.layout-aside,
.sidebar {
  min-width: 0;
}

.side-card,
.sidebar-inner,
.aside-inner {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  position: sticky;
  top: 88px;
}

.side-title,
.sidebar-title,
.aside-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-accent);
}

.side-list li,
.sidebar-list li,
.aside-list li {
  margin-bottom: 4px;
}

.side-list a,
.sidebar-list a,
.aside-list a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--color-text);
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.side-list a:hover,
.sidebar-list a:hover,
.aside-list a:hover {
  background-color: rgba(31, 58, 95, 0.06);
  color: var(--color-primary);
}

.side-note,
.sidebar-note,
.aside-note {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

/* 相关推荐 */
.related-links {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 2px solid var(--color-border);
}

.related-links h2 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.related-list li {
  margin-bottom: 8px;
}

.related-list a {
  font-size: 14px;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.related-list a::before {
  content: '→';
  color: var(--color-accent);
}

/* ------------------------------------------------------------
   Pages - 首页
   ------------------------------------------------------------ */
.home-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* 首屏频道地图 */
.hero-map {
  padding: 60px 0 48px;
}

.hero-map__inner {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-map__content h1 {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 16px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 28px;
  max-width: 480px;
}

.channel-index {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 32px;
}

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

.channel-index li:last-child {
  border-bottom: none;
}

.channel-index a {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  min-width: 72px;
}

.channel-index span {
  font-size: 14px;
  color: var(--color-muted);
}

.hero-map__media {
  position: relative;
}

.hero-figure {
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.hero-figure img {
  width: 100%;
  height: 360px;
  object-fit: cover;
}

/* 频道标签栏 */
.channel-tags {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

/* 专题榜单 */
.featured-collections {
  padding: 56px 0;
}

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

.section-head h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.section-desc {
  font-size: 15px;
  color: var(--color-muted);
  max-width: 640px;
}

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

.collection-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.collection-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.card-link {
  display: block;
}

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

.card-link h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
  padding: 20px 20px 8px;
}

.card-link p {
  font-size: 14px;
  color: var(--color-muted);
  padding: 0 20px 20px;
  line-height: 1.6;
}

/* 观看路径 */
.watch-path {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 48px;
  margin-bottom: 56px;
}

.path-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 32px;
}

.path-steps .step-item {
  padding: 24px;
  background-color: var(--color-bg);
  border-radius: var(--radius-card);
  border: 1px solid var(--color-border);
}

.path-steps .step-item h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.path-steps .step-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
}

.watch-path .btn-secondary {
  margin-top: 8px;
}

/* FAQ 摘要 */
.faq-summary {
  padding: 0 0 56px;
}

.faq-summary .section-head h2 {
  font-size: 24px;
}

.faq-summary .faq-list {
  max-width: 720px;
}

.faq-summary .text-link {
  margin-top: 16px;
}

/* 内容说明与入口 */
.content-cta {
  background-color: var(--color-primary);
  border-radius: var(--radius-card);
  padding: 48px;
  margin-bottom: 24px;
}

.cta-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 16px;
}

.cta-inner h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-white);
}

.cta-inner p {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.8);
  max-width: 560px;
}

.cta-inner .btn-primary {
  background-color: var(--color-accent);
  color: var(--color-primary);
  margin-top: 8px;
}

.cta-inner .btn-primary:hover {
  background-color: #f5b57a;
}

/* ------------------------------------------------------------
   Pages - 内页通用布局
   ------------------------------------------------------------ */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 48px;
  align-items: start;
}

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

/* 频道导航页 */
.channel-map-section {
  margin-bottom: 40px;
}

.channel-map-section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.channel-map-section p {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 16px;
}

.channel-map-figure {
  margin: 24px 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
}

.channel-map-figure img {
  width: 100%;
  height: 320px;
  object-fit: cover;
}

.channel-map-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-white);
}

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

.channel-block-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.channel-block-head h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
}

.channel-tag {
  display: inline-block;
  padding: 4px 14px;
  background-color: rgba(244, 162, 97, 0.15);
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-pill);
}

.channel-block p {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 12px;
  line-height: 1.7;
}

/* 专题片单页 */
.collections-layout {
  grid-template-columns: minmax(0, 1fr) 260px;
}

.collection-item {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 24px;
  margin-bottom: 24px;
  transition: box-shadow 0.2s ease;
}

.collection-item:hover {
  box-shadow: var(--shadow-hover);
}

.collection-media {
  border-radius: var(--radius-card);
  overflow: hidden;
}

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

.collection-body h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.collection-theme,
.collection-criteria,
.collection-highlight {
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1.6;
}

.collection-criteria {
  color: var(--color-muted);
}

.collection-highlight {
  color: var(--color-primary);
}

.collection-body .text-link {
  margin-top: 8px;
}

/* 观看指南页 */
.guide-step {
  margin-bottom: 48px;
  padding: 32px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
}

.step-heading {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.step-heading h2 {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-primary);
}

.guide-step p {
  font-size: 15px;
  color: var(--color-text);
  margin-bottom: 12px;
  line-height: 1.7;
}

.guide-step p a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.guide-figure {
  margin: 20px 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.guide-figure img {
  width: 100%;
  height: 260px;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-bg);
}

.guide-faq {
  margin-top: 48px;
}

.guide-faq h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 20px;
}

/* 入口核验页 */
.verify-steps {
  margin-bottom: 48px;
}

.verify-steps h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.verify-steps > p {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

.verify-steps .step-item {
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  margin-bottom: 16px;
}

.verify-steps .step-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.verify-steps .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 15px;
  border-radius: 50%;
  flex-shrink: 0;
}

.verify-steps .step-head h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
}

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

.judge-standards {
  margin-bottom: 48px;
}

.judge-standards h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.judge-standards > p {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

.standard-item {
  padding: 24px;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  margin-bottom: 16px;
}

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

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

/* 帮助反馈页 */
.faq-section {
  margin-bottom: 48px;
}

.faq-section .section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 20px;
}

.feedback-section {
  margin-bottom: 48px;
}

.feedback-section .section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section-intro {
  font-size: 15px;
  color: var(--color-muted);
  margin-bottom: 24px;
}

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

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

.feedback-step .step-number {
  margin-bottom: 12px;
}

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

.feedback-step .step-content p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
}

.feedback-media {
  margin-top: 20px;
  border-radius: var(--radius-card);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

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

.feedback-media figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-muted);
  background-color: var(--color-white);
}

/* ------------------------------------------------------------
   Pages - 404
   ------------------------------------------------------------ */
.error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 80px 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 64px - 320px);
}

.error-section {
  text-align: center;
  max-width: 520px;
}

.error-code {
  font-family: var(--font-num);
  font-size: 80px;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 16px;
}

.error-section h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.error-desc {
  font-size: 16px;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.error-hint {
  font-size: 14px;
  color: var(--color-muted);
  margin-bottom: 32px;
}

.error-btn {
  display: inline-block;
  padding: 12px 32px;
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 15px;
  font-weight: 600;
  border-radius: 6px;
  transition: background-color 0.2s ease;
}

.error-btn:hover {
  background-color: #2a4d7a;
  color: var(--color-white);
}

/* ------------------------------------------------------------
   Responsive - 响应式断点
   ------------------------------------------------------------ */
@media (max-width: 1024px) {
  .hero-map__inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

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

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

  .collection-item {
    grid-template-columns: 220px 1fr;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: 56px;
    padding: 0 16px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background-color: var(--color-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  }

  .site-nav .nav-list {
    display: none;
    flex-direction: column;
    padding: 12px 16px;
    gap: 2px;
  }

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

  .site-nav .nav-list a {
    padding: 14px 12px;
    font-size: 16px;
    border-radius: 6px;
  }

  .site-main {
    min-height: calc(100vh - 56px - 400px);
  }

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

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

  .site-inner {
    padding: 0 16px;
  }

  /* 页脚 */
  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    padding: 40px 16px 24px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  /* 首页 */
  .hero-map {
    padding: 32px 0;
  }

  .hero-map__inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .hero-map__content {
    order: 2;
  }

  .hero-map__media {
    order: 1;
  }

  .hero-map__content h1 {
    font-size: 28px;
  }

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

  .channel-index li {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 12px 0;
  }

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

  .card-link img {
    height: 200px;
  }

  .watch-path {
    padding: 24px 16px;
  }

  .path-steps {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .content-cta {
    padding: 32px 20px;
  }

  .cta-inner h2 {
    font-size: 22px;
  }

  /* 内页布局：侧栏移到正文上方（折叠） */
  .page-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .content-side,
  .sidebar-area,
  .layout-aside,
  .sidebar {
    order: 0;
    margin-bottom: 24px;
  }

  .content-main,
  .main-content,
  .layout-main {
    order: 1;
  }

  .side-card,
  .sidebar-inner,
  .aside-inner {
    position: static;
  }

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

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

  /* 频道导航页 */
  .channel-map-figure img {
    height: 200px;
  }

  .channel-block {
    padding: 20px;
  }

  .channel-block-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  /* 专题片单页 */
  .collection-item {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 16px;
  }

  .collection-media img {
    height: 180px;
  }

  /* 观看指南页 */
  .guide-step {
    padding: 24px 16px;
  }

  .step-heading {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

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

  /* 帮助页 */
  .feedback-steps {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .feedback-media img {
    height: 180px;
  }

  /* 404 */
  .error-main {
    padding: 48px 16px;
  }

  .error-code {
    font-size: 60px;
  }
}

@media (max-width: 480px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-brand {
    grid-column: 1;
  }

  .tag-row {
    gap: 8px;
  }

  .tag-pill {
    padding: 6px 14px;
    font-size: 13px;
  }

  .hero-map__content h1 {
    font-size: 24px;
  }

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

  .btn-primary,
  .btn-secondary {
    padding: 10px 20px;
    font-size: 14px;
  }

  .watch-path {
    padding: 20px 12px;
  }

  .path-steps .step-item {
    padding: 16px;
  }

  .content-cta {
    padding: 24px 16px;
  }

  .cta-inner h2 {
    font-size: 20px;
  }

  .cta-inner p {
    font-size: 14px;
  }

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

  .page-description {
    font-size: 14px;
  }

  .breadcrumb {
    font-size: 13px;
  }

  .collection-item {
    padding: 12px;
  }

  .collection-body h2 {
    font-size: 18px;
  }

  .guide-step {
    padding: 16px 12px;
  }

  .step-heading h2 {
    font-size: 18px;
  }

  .verify-steps .step-item {
    padding: 16px;
  }

  .standard-item {
    padding: 16px;
  }

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

/* 滚动出现动画 - 仅作为增强，不影响初始可见性 */
@media (prefers-reduced-motion: no-preference) {
  .collection-card,
  .channel-block,
  .guide-step,
  .collection-item,
  .standard-item,
  .feedback-step {
    transition: transform 0.25s ease, box-shadow 0.25s ease;
  }

  .collection-card:hover,
  .channel-block:hover,
  .guide-step:hover,
  .collection-item:hover,
  .standard-item:hover,
  .feedback-step:hover {
    transform: translateY(-2px);
  }
}

/* 程序验收反馈：移动端正文优先 */
@media (max-width: 768px) {
  .site-main :is(.page-content, .main-content, .content-main) {
    order: 1;
  }

  .site-main :is(aside, .sidebar) {
    order: 2;
  }
}