/* ==========================================================================
   黑料吃瓜在线观看 · 全站样式表
   视觉方向：可持续品牌风 · 暖灰米白 + 深青灰 + 陶土色
   ========================================================================== */

/* ==========================================================================
   Base —— 基础变量、重置、全局元素
   ========================================================================== */

:root {
  --color-bg: #f5f0e8;
  --color-ink: #2f3e46;
  --color-accent: #c17a4e;
  --color-sand: #e0d5c1;
  --color-card: #ffffff;
  --color-text-soft: #6b7a80;
  --color-border: #e6ded0;
  --font-sans: -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --container-width: 1200px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-card: 0 2px 8px rgba(47, 62, 70, 0.06);
  --shadow-hover: 0 6px 18px rgba(47, 62, 70, 0.1);
  --transition: 0.2s ease;
}

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

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

body {
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-ink);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

ul,
ol {
  list-style: none;
}

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

p {
  margin-bottom: 0.8em;
}

/* ==========================================================================
   Layout —— 全站容器、页头、页脚、面包屑、页面标题
   ========================================================================== */

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

.home-main {
  width: 100%;
}

.inner-main {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 20px 64px;
}

/* ---------- 页头 ---------- */

.site-header {
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 24px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0.01em;
}

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

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

.site-nav .nav-list a {
  display: inline-block;
  padding: 8px 14px;
  font-size: 15px;
  font-weight: 400;
  border-radius: var(--radius-md);
  color: var(--color-ink);
}

.site-nav .nav-list a:hover {
  color: var(--color-accent);
  background-color: rgba(193, 122, 78, 0.08);
}

.site-nav .nav-list a.is-current {
  color: var(--color-accent);
  font-weight: 600;
  background-color: rgba(193, 122, 78, 0.1);
}

/* 汉堡按钮 —— 桌面隐藏 */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-ink);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ---------- 面包屑 ---------- */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--color-text-soft);
  margin-bottom: 20px;
}

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

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

.breadcrumb-sep {
  color: var(--color-sand);
  font-size: 13px;
}

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

/* ---------- 页面标题区（内页统一） ---------- */

.page-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 10px;
}

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

/* ---------- 页脚 ---------- */

.site-footer {
  background-color: var(--color-ink);
  color: rgba(255, 255, 255, 0.85);
  padding: 48px 20px 32px;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  justify-content: space-between;
  align-items: flex-start;
}

.footer-brand {
  flex: 1 1 280px;
}

.footer-name {
  font-size: 18px;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 8px;
}

.footer-desc {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.6;
  max-width: 360px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  align-items: center;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
  padding: 4px 0;
}

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

.footer-copy {
  flex-basis: 100%;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.45);
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  text-align: left;
}

/* ==========================================================================
   Components —— 通用组件
   ========================================================================== */

/* ---------- section 公共头 ---------- */

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}

.section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-ink);
}

.section-more {
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
  white-space: nowrap;
  padding: 4px 0;
}

.section-more:hover {
  color: var(--color-ink);
}

/* ---------- 频道标签 ---------- */

.channel-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.channel-tag {
  display: inline-block;
  padding: 8px 20px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-ink);
  transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}

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

/* ---------- 专题卡片（首页） ---------- */

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

.topic-card {
  background-color: var(--color-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.topic-media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--color-sand);
}

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

.topic-body {
  padding: 20px 22px 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.topic-name {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.topic-desc {
  font-size: 14px;
  color: var(--color-text-soft);
  line-height: 1.7;
  flex: 1;
  margin-bottom: 16px;
}

.topic-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.topic-link:hover {
  color: var(--color-ink);
}

/* ---------- 视频卡片（专题页） ---------- */

.video-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.video-card {
  background-color: var(--color-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.video-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.video-card-img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background-color: var(--color-sand);
}

.video-card-title {
  font-size: 16px;
  font-weight: 600;
  padding: 14px 16px 4px;
}

.video-card-audience {
  font-size: 13px;
  color: var(--color-text-soft);
  padding: 0 16px 16px;
}

/* ---------- 频道卡片（频道页） ---------- */

.channels-grid {
  margin-bottom: 48px;
}

.channels-grid .section-title {
  margin-bottom: 20px;
}

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

.channel-card {
  background-color: var(--color-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.channel-card-img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background-color: var(--color-sand);
}

.channel-card-body {
  padding: 18px 20px 22px;
}

.channel-card-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 8px;
}

.channel-card-desc {
  font-size: 14px;
  color: var(--color-text-soft);
  line-height: 1.7;
  margin-bottom: 12px;
}

.channel-card-topic,
.channel-card-audience {
  font-size: 13px;
  color: var(--color-ink);
  line-height: 1.6;
  margin-bottom: 6px;
}

.channel-card-topic strong,
.channel-card-audience strong {
  color: var(--color-accent);
  font-weight: 600;
  margin-right: 6px;
}

/* ---------- 指南步骤 ---------- */

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

.guide-step {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  box-shadow: var(--shadow-card);
}

.step-num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: #ffffff;
  font-size: 15px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-content {
  flex: 1;
}

.step-content h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.step-content p {
  font-size: 14px;
  color: var(--color-text-soft);
  margin-bottom: 0;
}

/* ---------- FAQ 手风琴 ---------- */

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

.faq-item {
  background-color: var(--color-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
}

.faq-item summary {
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 44px;
  transition: color var(--transition);
}

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

.faq-item summary::after {
  content: '+';
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  font-weight: 400;
  color: var(--color-accent);
  transition: transform var(--transition);
}

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

.faq-item summary:hover {
  color: var(--color-accent);
}

.faq-item p {
  padding: 0 20px 18px;
  font-size: 14px;
  color: var(--color-text-soft);
  line-height: 1.7;
  border-top: 1px solid var(--color-border);
  padding-top: 14px;
}

/* ---------- 图片与说明 ---------- */

.guide-figure {
  margin: 20px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-sand);
}

.guide-figure img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.guide-figure figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-soft);
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
}

.content-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 24px;
  background-color: var(--color-sand);
}

.content-media img {
  width: 100%;
  aspect-ratio: 16 / 6;
  object-fit: cover;
}

.content-media figcaption {
  padding: 10px 16px;
  font-size: 13px;
  color: var(--color-text-soft);
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
}

/* ==========================================================================
   Pages —— 首页
   ========================================================================== */

/* ---------- 首屏双通道 ---------- */

.hero-section {
  background-color: var(--color-card);
  border-bottom: 1px solid var(--color-border);
}

.hero-layout {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 20px 48px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-intro {
  padding-right: 12px;
}

.hero-title {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
  color: var(--color-ink);
}

.hero-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-soft);
  margin-bottom: 28px;
  max-width: 520px;
}

.hero-cta {
  display: inline-block;
  padding: 12px 28px;
  background-color: var(--color-accent);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color var(--transition), transform var(--transition);
}

.hero-cta:hover {
  background-color: var(--color-ink);
  color: #ffffff;
  transform: translateY(-2px);
}

.hero-quick {
  background-color: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.hero-quick-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 18px;
  color: var(--color-ink);
}

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

.quick-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.quick-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

.quick-card-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-ink);
}

.quick-card:hover .quick-card-name {
  color: var(--color-accent);
}

.quick-card-desc {
  font-size: 13px;
  color: var(--color-text-soft);
}

/* ---------- 频道导航带 ---------- */

.channel-strip-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 20px 8px;
}

/* ---------- 专题推荐 ---------- */

.topic-feature-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 20px 8px;
}

/* ---------- 最新更新 ---------- */

.latest-update-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 40px 20px 8px;
}

.update-list {
  display: flex;
  flex-direction: column;
}

.update-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--color-border);
}

.update-item:first-child {
  border-top: 1px solid var(--color-border);
}

.update-text {
  flex: 1;
  min-width: 0;
}

.update-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 6px;
}

.update-title a {
  color: var(--color-ink);
}

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

.update-desc {
  font-size: 14px;
  color: var(--color-text-soft);
  line-height: 1.7;
  margin-bottom: 0;
  max-width: 720px;
}

.update-date {
  flex-shrink: 0;
  font-size: 13px;
  color: var(--color-text-soft);
  padding-top: 4px;
  white-space: nowrap;
}

/* ---------- 指南与反馈入口 ---------- */

.guide-feedback-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 20px 64px;
}

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

.guide-card,
.feedback-card {
  background-color: var(--color-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 28px;
  transition: transform var(--transition), box-shadow var(--transition);
}

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

.guide-card-title,
.feedback-card-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.guide-card-desc,
.feedback-card-desc {
  font-size: 14px;
  color: var(--color-text-soft);
  line-height: 1.7;
  margin-bottom: 16px;
}

.guide-card-link,
.feedback-card-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  display: inline-block;
}

.guide-card-link:hover,
.feedback-card-link:hover {
  color: var(--color-ink);
}

/* ---------- 首屏视觉图 ---------- */

.hero-visual-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px 48px;
}

.hero-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--color-sand);
}

.hero-figure img {
  width: 100%;
  aspect-ratio: 21 / 8;
  object-fit: cover;
}

/* ==========================================================================
   Pages —— 频道分类页
   ========================================================================== */

.channel-notes {
  background-color: var(--color-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 28px;
}

.channel-notes .section-title {
  margin-bottom: 16px;
}

.channel-notes p {
  font-size: 14px;
  color: var(--color-text-soft);
  line-height: 1.8;
  margin-bottom: 12px;
}

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

.channel-notes a:hover {
  color: var(--color-ink);
}

/* ==========================================================================
   Pages —— 观看指南页
   ========================================================================== */

.guide-section {
  margin-bottom: 48px;
  scroll-margin-top: 80px;
}

.guide-section > h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.guide-section > p {
  font-size: 15px;
  color: var(--color-text-soft);
  line-height: 1.8;
  margin-bottom: 20px;
}

.guide-section > p a {
  color: var(--color-accent);
  font-weight: 500;
}

.guide-section > p a:hover {
  color: var(--color-ink);
}

/* ---------- 视频卡片说明 ---------- */

.card-explain {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 24px;
  align-items: center;
  background-color: var(--color-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px;
  margin: 20px 0;
}

.card-sample {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

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

.card-sample-title {
  font-size: 15px;
  font-weight: 600;
  padding: 12px 16px 4px;
}

.card-sample-meta {
  font-size: 13px;
  color: var(--color-text-soft);
  padding: 0 16px 12px;
}

.card-explain-text p {
  font-size: 14px;
  color: var(--color-text-soft);
  line-height: 1.8;
  margin-bottom: 12px;
}

/* ==========================================================================
   Pages —— 专题推荐页
   ========================================================================== */

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

.topic-list-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}

.topic-list-desc {
  font-size: 15px;
  color: var(--color-text-soft);
  margin-bottom: 24px;
}

.topic-list-section .topic-card {
  display: grid;
  grid-template-columns: 320px 1fr;
  margin-bottom: 24px;
  gap: 0;
}

.topic-card-media {
  background-color: var(--color-sand);
  overflow: hidden;
}

.topic-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.topic-card-body {
  padding: 24px 28px;
  display: flex;
  flex-direction: column;
}

.topic-card-title {
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 10px;
}

.topic-card-intro {
  font-size: 14px;
  color: var(--color-text-soft);
  line-height: 1.7;
  margin-bottom: 14px;
}

.topic-card-themes,
.topic-card-audience {
  font-size: 13px;
  color: var(--color-ink);
  margin-bottom: 6px;
  line-height: 1.6;
}

.topic-card-themes strong,
.topic-card-audience strong {
  color: var(--color-accent);
  font-weight: 600;
  margin-right: 6px;
}

.topic-card-link {
  margin-top: auto;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  align-self: flex-start;
}

.topic-card-link:hover {
  color: var(--color-ink);
}

/* ---------- 专题详情 ---------- */

.topic-detail-section {
  margin-bottom: 48px;
  scroll-margin-top: 80px;
}

.topic-detail-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.topic-detail-desc {
  font-size: 15px;
  color: var(--color-text-soft);
  line-height: 1.7;
  margin: 16px 0 24px;
}

/* ---------- 相关链接 ---------- */

.topic-related-links {
  background-color: var(--color-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 24px;
  margin-top: 16px;
}

.topic-related-links p {
  font-size: 14px;
  color: var(--color-text-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-bottom: 0;
}

.topic-related-links a {
  color: var(--color-accent);
  font-weight: 500;
  padding: 4px 0;
}

.topic-related-links a:hover {
  color: var(--color-ink);
}

/* ==========================================================================
   Pages —— 常见问题页
   ========================================================================== */

.faq-section {
  margin-bottom: 48px;
  scroll-margin-top: 80px;
}

.faq-section > h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.faq-section > p {
  font-size: 15px;
  color: var(--color-text-soft);
  line-height: 1.8;
  margin-bottom: 20px;
}

.faq-section > p a {
  color: var(--color-accent);
  font-weight: 500;
}

.faq-section > p a:hover {
  color: var(--color-ink);
}

/* ==========================================================================
   Pages —— 404 页
   ========================================================================== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  flex: 1;
}

.error-panel {
  max-width: 560px;
  width: 100%;
  text-align: left;
  background-color: var(--color-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 48px;
}

.error-code {
  font-size: 64px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-text-soft);
  line-height: 1.7;
  margin-bottom: 28px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 24px;
}

.error-btn {
  display: inline-block;
  padding: 12px 28px;
  background-color: var(--color-accent);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: background-color var(--transition);
}

.error-btn:hover {
  background-color: var(--color-ink);
  color: #ffffff;
}

.error-link {
  font-size: 14px;
  color: var(--color-accent);
  font-weight: 500;
}

.error-link:hover {
  color: var(--color-ink);
}

.error-help {
  font-size: 14px;
  color: var(--color-text-soft);
  margin-bottom: 0;
}

.error-help a {
  color: var(--color-accent);
  font-weight: 500;
}

.error-help a:hover {
  color: var(--color-ink);
}

/* ==========================================================================
   Responsive —— 响应式（断点 768px）
   ========================================================================== */

@media (max-width: 768px) {
  /* ---------- 页头移动端 ---------- */

  .header-inner {
    min-height: 56px;
    padding: 0 16px;
    gap: 12px;
  }

  .nav-toggle {
    display: flex;
    order: 2;
  }

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

  .site-nav .nav-list {
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 16px;
  }

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

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

  .site-nav .nav-list a {
    display: block;
    padding: 12px 8px;
    font-size: 16px;
    border-radius: var(--radius-md);
  }

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

  /* ---------- 内页容器 ---------- */

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

  .page-title {
    font-size: 24px;
  }

  .page-header {
    margin-bottom: 24px;
    padding-bottom: 18px;
  }

  /* ---------- 首页 ---------- */

  .hero-layout {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 36px 16px 32px;
  }

  .hero-intro {
    padding-right: 0;
  }

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

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

  .hero-quick {
    padding: 22px;
  }

  .channel-strip-section,
  .topic-feature-section,
  .latest-update-section,
  .guide-feedback-section,
  .hero-visual-section {
    padding-left: 16px;
    padding-right: 16px;
  }

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

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

  .update-item {
    flex-direction: column;
    gap: 8px;
  }

  .update-date {
    white-space: normal;
  }

  /* ---------- 频道页 ---------- */

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

  /* ---------- 专题页 ---------- */

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

  .topic-card-media {
    aspect-ratio: 16 / 9;
  }

  .topic-card-img {
    aspect-ratio: 16 / 9;
  }

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

  /* ---------- 指南页 ---------- */

  .card-explain {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 16px;
  }

  .guide-step {
    padding: 14px 16px;
  }

  /* ---------- 页脚 ---------- */

  .footer-inner {
    flex-direction: column;
    gap: 20px;
  }

  .footer-links {
    gap: 8px 20px;
  }

  .footer-copy {
    margin-top: 12px;
  }

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

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

  .error-panel {
    padding: 32px 24px;
  }

  .error-code {
    font-size: 48px;
  }

  /* ---------- FAQ ---------- */

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

/* ---------- 小屏微调 ---------- */

@media (max-width: 480px) {
  .brand-name {
    font-size: 18px;
  }

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

  .section-title {
    font-size: 19px;
  }

  .guide-feedback-grid .guide-card,
  .guide-feedback-grid .feedback-card {
    padding: 22px;
  }

  .channel-tag-list {
    gap: 8px;
  }

  .channel-tag {
    padding: 7px 14px;
    font-size: 13px;
  }

  .faq-item summary {
    padding: 14px 40px 14px 16px;
    font-size: 14px;
  }

  .faq-item p {
    padding: 12px 16px 16px;
  }

  .footer-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
}