/* ==========================================================================
   zhenbanga.com - 糖心vlog 整站样式表
   视觉方向：游戏资料站风 · 深浅区域对比 · 角色图鉴感内容卡片
   ========================================================================== */

/* ==========================================================================
   Base
   ========================================================================== */

:root {
  --color-bg-dark: #0d1220;
  --color-bg-dark-card: #171f33;
  --color-bg-light: #f5f6fa;
  --color-bg-card: #ffffff;
  --color-accent: #ffb347;
  --color-accent-cyan: #4cc9f0;
  --color-text-dark: #1a1d26;
  --color-text-light: #5a6070;
  --color-border: #e3e6ef;
  --color-text-on-dark: #c7cede;
  --color-text-on-dark-muted: #8a93a8;
  --color-white: #ffffff;

  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;

  --container-width: 1200px;
  --header-height: 68px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --transition-base: 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-family);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-dark);
  background-color: var(--color-bg-light);
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: #2ba8cf;
}

ul,
ol {
  list-style: none;
}

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

h1 {
  font-size: 32px;
}

h2 {
  font-size: 24px;
}

h3 {
  font-size: 17px;
}

p {
  color: var(--color-text-light);
}

/* ==========================================================================
   Layout
   ========================================================================== */

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

.site-header {
  background-color: var(--color-bg-dark);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

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

.brand-name {
  font-size: 20px;
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: 0.5px;
}

.brand-name::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background-color: var(--color-accent);
  border-radius: 2px;
  margin-right: 8px;
  vertical-align: 2px;
}

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

.site-nav .nav-list a {
  display: block;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-on-dark);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.site-nav .nav-list a:hover {
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.08);
}

.site-nav .nav-list a.is-current {
  color: var(--color-accent);
  background-color: rgba(255, 179, 71, 0.12);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 12px;
  width: 44px;
  height: 44px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  border-radius: var(--radius-sm);
}

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

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

.home-main {
  background-color: var(--color-bg-light);
}

.inner-main {
  background-color: var(--color-bg-light);
  padding-bottom: 64px;
}

/* 内页统一容器 */
.site-inner .inner-main,
.site-error .error-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
  padding-top: 40px;
  padding-bottom: 64px;
}

/* ==========================================================================
   面包屑
   ========================================================================== */

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 24px;
}

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

.breadcrumb a:hover {
  color: #2ba8cf;
}

.breadcrumb-sep {
  color: #9aa1b0;
  font-size: 12px;
}

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

/* ==========================================================================
   页面标题区
   ========================================================================== */

.page-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  font-size: 30px;
  font-weight: 800;
  color: var(--color-text-dark);
  margin-bottom: 12px;
}

.page-description {
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-light);
  max-width: 720px;
}

.section-title {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 16px;
}

/* ==========================================================================
   Components
   ========================================================================== */

/* 版本标签 */
.version-tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  background-color: var(--color-accent);
  color: #1a1d26;
  font-size: 13px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  line-height: 1.4;
}

/* 区块描述 */
.section-desc {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 24px;
  max-width: 640px;
}

/* 区块链接 */
.section-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent-cyan);
}

.section-link::after {
  content: "→";
  font-size: 16px;
  transition: transform var(--transition-base);
}

.section-link:hover::after {
  transform: translateX(3px);
}

/* 视频卡片 */
.video-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.video-card:hover {
  box-shadow: 0 6px 20px rgba(13, 18, 32, 0.08);
  transform: translateY(-2px);
}

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

.video-card h3 {
  font-size: 16px;
  font-weight: 600;
  padding: 12px 16px 4px;
  line-height: 1.4;
}

.video-card .meta {
  padding: 0 16px 12px;
  font-size: 13px;
  color: var(--color-text-light);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.video-card .card-link {
  margin-top: auto;
  padding: 10px 16px;
  border-top: 1px solid var(--color-border);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent-cyan);
}

.video-card .card-link:hover {
  background-color: var(--color-bg-light);
}

/* 频道卡片（首页） */
.channel-card {
  background-color: var(--color-bg-dark-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: border-color var(--transition-base), transform var(--transition-base);
}

.channel-card:hover {
  border-color: rgba(76, 201, 240, 0.4);
  transform: translateY(-2px);
}

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

.channel-card h3 {
  color: var(--color-white);
  font-size: 17px;
  padding: 14px 16px 6px;
}

.channel-card p {
  color: var(--color-text-on-dark-muted);
  font-size: 13px;
  padding: 0 16px;
  line-height: 1.6;
  flex: 1 0 auto;
}

.channel-card .card-link {
  display: block;
  padding: 10px 16px 14px;
  color: var(--color-accent-cyan);
  font-size: 13px;
  font-weight: 600;
}

/* 按钮 */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  background-color: var(--color-accent);
  color: #1a1d26;
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--radius-md);
  min-height: 44px;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition-base);
}

.btn-primary:hover {
  background-color: #f5a233;
  color: #1a1d26;
}

/* 视觉隐藏 */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ==========================================================================
   首页模块
   ========================================================================== */

/* 双通道首屏 */
.dual-hero {
  background-color: var(--color-bg-dark);
  color: var(--color-white);
  padding: 64px 24px;
}

.dual-hero .container {
  max-width: var(--container-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: start;
}

.hero-copy h1 {
  color: var(--color-white);
  font-size: 34px;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-copy h1 span {
  color: var(--color-accent);
}

.hero-lead {
  color: var(--color-text-on-dark);
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 28px;
  max-width: 560px;
}

.hero-figure {
  margin-top: 8px;
}

.hero-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.quick-access {
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.quick-title {
  color: var(--color-white);
  font-size: 18px;
  margin-bottom: 20px;
}

.quick-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.quick-list a {
  display: block;
  padding: 14px 16px;
  background-color: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  color: var(--color-text-on-dark);
  font-size: 14px;
  font-weight: 500;
  transition: background-color var(--transition-base), color var(--transition-base);
}

.quick-list a:hover {
  background-color: rgba(255, 179, 71, 0.15);
  color: var(--color-accent);
}

/* 频道卡片带 */
.channel-band {
  background-color: var(--color-bg-dark);
  padding: 56px 24px 64px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.channel-band .container {
  max-width: var(--container-width);
  margin: 0 auto;
}

.channel-band h2 {
  color: var(--color-white);
  margin-bottom: 8px;
}

.channel-band .section-desc {
  color: var(--color-text-on-dark-muted);
}

.channel-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 28px;
}

/* 最新专题区 */
.latest-topic {
  padding: 64px 24px;
  background-color: var(--color-bg-light);
}

.latest-topic .container {
  max-width: var(--container-width);
  margin: 0 auto;
}

.topic-intro {
  margin-bottom: 32px;
  max-width: 640px;
}

.topic-intro .version-tag {
  margin-bottom: 12px;
}

.topic-intro h2 {
  font-size: 26px;
  margin: 12px 0 12px;
}

.topic-intro p {
  margin-bottom: 16px;
}

.topic-card-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

/* 热门题材索引 */
.hot-topics {
  padding: 64px 24px;
  background-color: var(--color-bg-card);
}

.hot-topics .container {
  max-width: var(--container-width);
  margin: 0 auto;
}

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

/* 观看指南三步 */
.guide-summary {
  padding: 64px 24px;
  background-color: var(--color-bg-dark);
}

.guide-summary .container {
  max-width: var(--container-width);
  margin: 0 auto;
}

.guide-summary h2 {
  color: var(--color-white);
  margin-bottom: 32px;
}

.guide-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 32px;
}

.guide-steps li {
  background-color: var(--color-bg-dark-card);
  border-radius: var(--radius-lg);
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.guide-steps li h3 {
  color: var(--color-accent);
  font-size: 16px;
  margin-bottom: 8px;
}

.guide-steps li p {
  color: var(--color-text-on-dark-muted);
  font-size: 14px;
}

/* 常见问题与反馈入口 */
.faq-feedback {
  padding: 64px 24px;
  background-color: var(--color-bg-light);
}

.faq-feedback .container {
  max-width: var(--container-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.faq-entry h2,
.feedback-entry h2 {
  margin-bottom: 20px;
}

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

.faq-list li a {
  display: block;
  padding: 14px 16px;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-dark);
  font-size: 14px;
  font-weight: 500;
  transition: border-color var(--transition-base), color var(--transition-base);
}

.faq-list li a:hover {
  border-color: var(--color-accent-cyan);
  color: var(--color-accent-cyan);
}

.feedback-entry p {
  margin-bottom: 20px;
  max-width: 420px;
}

/* ==========================================================================
   内页通用模块
   ========================================================================== */

/* 频道概览 */
.channel-overview {
  margin-bottom: 48px;
}

.overview-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 0;
  overflow: hidden;
}

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

.overview-text {
  padding: 28px 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  justify-content: center;
}

.overview-text p {
  font-size: 15px;
  line-height: 1.8;
}

/* 频道属性表 */
.channel-attributes {
  margin-bottom: 48px;
}

.table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-bg-card);
}

.attribute-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

.attribute-table th,
.attribute-table td {
  padding: 16px 20px;
  text-align: left;
  font-size: 14px;
  border-bottom: 1px solid var(--color-border);
}

.attribute-table th {
  background-color: var(--color-bg-dark);
  color: var(--color-white);
  font-weight: 600;
  white-space: nowrap;
}

.attribute-table td {
  color: var(--color-text-light);
  vertical-align: top;
}

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

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

/* 频道专题入口 */
.channel-topic-links {
  margin-bottom: 48px;
}

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

.topic-link-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow var(--transition-base);
}

.topic-link-card:hover {
  box-shadow: 0 6px 20px rgba(13, 18, 32, 0.08);
}

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

.topic-link-card h3 {
  padding: 14px 20px 4px;
  font-size: 16px;
}

.topic-link-card p {
  padding: 0 20px;
  font-size: 14px;
  color: var(--color-text-light);
  flex: 1 0 auto;
}

.topic-link-card a {
  display: block;
  padding: 12px 20px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent-cyan);
}

/* 指南提示 */
.guide-prompt {
  background-color: var(--color-bg-dark);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.guide-prompt h2 {
  color: var(--color-white);
  margin-bottom: 12px;
}

.guide-prompt p {
  color: var(--color-text-on-dark-muted);
  font-size: 15px;
}

.guide-prompt p a {
  color: var(--color-accent);
  font-weight: 600;
}

/* ==========================================================================
   专题片单页
   ========================================================================== */

/* 最新一期专题 */
.topic-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 32px;
  align-items: start;
  margin-bottom: 48px;
}

.topic-cover img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.cover-caption {
  font-size: 13px;
  color: var(--color-text-light);
  margin-top: 8px;
  line-height: 1.6;
}

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

.topic-list .video-card {
  flex-direction: row;
  align-items: stretch;
}

.topic-list .card-media {
  width: 180px;
  flex-shrink: 0;
}

.topic-list .card-media img {
  width: 100%;
  height: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.topic-list .card-body {
  padding: 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1 1 auto;
}

.topic-list .card-body h3 {
  padding: 0;
  font-size: 15px;
}

.topic-list .card-body p {
  font-size: 13px;
  color: var(--color-text-light);
  padding: 0;
}

.topic-list .topic-tag {
  display: inline-block;
  align-self: flex-start;
  padding: 2px 10px;
  background-color: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  font-size: 12px;
  color: var(--color-text-light);
}

/* 主题标签 */
.topic-tags {
  margin-bottom: 48px;
}

.topic-tags h2 {
  margin-bottom: 8px;
}

.topic-tags > p {
  margin-bottom: 20px;
  max-width: 640px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag-list a {
  display: inline-block;
  padding: 8px 18px;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 14px;
  color: var(--color-text-dark);
  transition: border-color var(--transition-base), color var(--transition-base);
}

.tag-list a:hover {
  border-color: var(--color-accent-cyan);
  color: var(--color-accent-cyan);
}

/* 往期目录 */
.archive-list {
  margin-bottom: 48px;
}

.archive-list h2 {
  margin-bottom: 8px;
}

.archive-list > p {
  margin-bottom: 24px;
}

.archive-items {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.archive-item {
  display: grid;
  grid-template-columns: 100px 160px 1fr;
  gap: 20px;
  align-items: center;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  transition: border-color var(--transition-base);
}

.archive-item:hover {
  border-color: var(--color-accent-cyan);
}

.archive-number {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-accent);
  background-color: rgba(255, 179, 71, 0.12);
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  text-align: center;
}

.archive-theme {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-dark);
}

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

/* 相关链接 */
.topic-related {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
}

.topic-related p {
  font-size: 15px;
}

.topic-related p a {
  margin-right: 16px;
  font-weight: 600;
}

/* ==========================================================================
   观看指南页
   ========================================================================== */

/* 结论摘要 */
.summary-box {
  background-color: var(--color-bg-dark);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  margin-bottom: 48px;
  border-left: 4px solid var(--color-accent);
}

.summary-box p {
  color: var(--color-text-on-dark);
  font-size: 16px;
  line-height: 1.8;
}

/* 入口类型 */
.entry-types {
  margin-bottom: 48px;
}

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

.type-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.type-card h3 {
  font-size: 16px;
  color: var(--color-text-dark);
}

.type-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* 核验步骤 */
.verify-steps {
  margin-bottom: 48px;
}

.steps-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 20px;
}

.step-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 20px;
  align-items: start;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.step-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--color-bg-dark);
  color: var(--color-accent);
  font-size: 18px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-content h3 {
  margin-bottom: 6px;
}

.step-content p {
  font-size: 14px;
  line-height: 1.7;
}

.steps-link {
  font-size: 14px;
}

.steps-link a {
  margin-right: 16px;
  font-weight: 600;
}

/* 常见误区 */
.common-misconceptions {
  margin-bottom: 48px;
}

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

.misconception-item {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

.misconception-item h3 {
  font-size: 15px;
  margin-bottom: 8px;
  color: var(--color-text-dark);
}

.misconception-item p {
  font-size: 14px;
  line-height: 1.7;
}

/* 指南示意图 */
.guide-figure {
  background-color: var(--color-bg-dark);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 32px;
}

.guide-figure img {
  width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.guide-figure figcaption {
  color: var(--color-text-on-dark-muted);
  font-size: 13px;
  margin-top: 12px;
}

/* ==========================================================================
   常见问题页
   ========================================================================== */

/* 问题分类 */
.issue-categories {
  margin-bottom: 48px;
}

.issue-categories h2 {
  margin-bottom: 8px;
}

.issue-categories > p {
  margin-bottom: 24px;
  max-width: 640px;
}

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

.category-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.category-card h3 {
  font-size: 15px;
}

.category-card p {
  font-size: 13px;
  line-height: 1.6;
  flex: 1 0 auto;
}

.category-card a {
  font-size: 13px;
  font-weight: 600;
}

/* 问题列表 */
.faq-list-section {
  margin-bottom: 48px;
}

.faq-list-section h2 {
  margin-bottom: 24px;
}

.faq-item {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
}

.faq-item details {
  padding: 0;
}

.faq-item summary {
  padding: 18px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text-dark);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

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

.faq-item summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: var(--color-accent-cyan);
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

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

.faq-answer {
  padding: 0 24px 20px;
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.faq-answer p {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 10px;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

.faq-answer a {
  font-weight: 600;
}

/* 自助排查 */
.troubleshooting {
  margin-bottom: 48px;
}

.troubleshooting h2 {
  margin-bottom: 8px;
}

.troubleshooting > p {
  margin-bottom: 24px;
  max-width: 640px;
}

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

.troubleshoot-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.troubleshoot-card h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

.troubleshoot-card p {
  font-size: 14px;
  line-height: 1.7;
}

/* 服务政策 */
.service-policy {
  margin-bottom: 48px;
}

.policy-content {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.policy-content p {
  font-size: 14px;
  line-height: 1.8;
}

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

.feedback-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
}

.feedback-card h3 {
  font-size: 15px;
  margin-bottom: 8px;
}

.feedback-card p {
  font-size: 14px;
  line-height: 1.7;
}

.feedback-cta {
  margin-top: 8px;
}

/* ==========================================================================
   问题反馈页
   ========================================================================== */

/* 反馈流程示意图 */
.feedback-visual {
  margin-bottom: 48px;
}

.feedback-figure img {
  width: 100%;
  aspect-ratio: 16 / 6;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.feedback-figure figcaption {
  font-size: 13px;
  color: var(--color-text-light);
  margin-top: 8px;
}

/* 反馈类型 */
.feedback-types {
  margin-bottom: 48px;
}

.feedback-types h2 {
  margin-bottom: 8px;
}

.section-intro {
  margin-bottom: 24px;
  max-width: 640px;
  font-size: 15px;
}

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

.type-grid .type-card {
  gap: 12px;
}

.type-link {
  margin-top: 8px;
}

.type-link a {
  font-size: 13px;
  font-weight: 600;
}

/* 提交前检查 */
.pre-submit-check {
  margin-bottom: 48px;
}

.pre-submit-check h2 {
  margin-bottom: 8px;
}

.check-list {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 8px 0;
}

.check-list li {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 20px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--color-border);
}

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

.check-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-dark);
}

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

.check-desc a {
  font-weight: 600;
}

/* 处理范围 */
.scope-section {
  margin-bottom: 48px;
}

.scope-section h2 {
  margin-bottom: 8px;
}

.scope-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-bg-card);
}

.scope-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
}

.scope-table th,
.scope-table td {
  padding: 16px 20px;
  text-align: left;
  font-size: 14px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.scope-table th {
  background-color: var(--color-bg-dark);
  color: var(--color-white);
  font-weight: 600;
}

.scope-table td {
  color: var(--color-text-light);
  line-height: 1.7;
}

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

/* 反馈方式 */
.feedback-methods {
  margin-bottom: 48px;
}

.feedback-methods h2 {
  margin-bottom: 8px;
}

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

.method-item {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 20px;
  align-items: start;
}

.method-item h3 {
  font-size: 15px;
}

.method-item p {
  font-size: 14px;
  line-height: 1.7;
}

.method-item p a {
  font-weight: 600;
}

/* ==========================================================================
   404 页面
   ========================================================================== */

.error-main {
  background-color: var(--color-bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
}

.error-panel {
  max-width: 560px;
  text-align: center;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
}

.error-code {
  font-size: 72px;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

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

.error-desc {
  font-size: 15px;
  margin-bottom: 12px;
}

.error-guide {
  font-size: 14px;
  margin-bottom: 28px;
}

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

.error-actions a:not(.btn-primary) {
  display: inline-flex;
  align-items: center;
  padding: 12px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-dark);
  min-height: 44px;
  transition: border-color var(--transition-base);
}

.error-actions a:not(.btn-primary):hover {
  border-color: var(--color-accent-cyan);
  color: var(--color-accent-cyan);
}

/* ==========================================================================
   页脚
   ========================================================================== */

.site-footer {
  background-color: var(--color-bg-dark);
  color: var(--color-text-on-dark);
  margin-top: auto;
}

.footer-shell {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.footer-col h3 {
  color: var(--color-white);
  font-size: 15px;
  margin-bottom: 16px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul a {
  color: var(--color-text-on-dark-muted);
  font-size: 14px;
  transition: color var(--transition-base);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding: 20px 24px;
  text-align: center;
}

.footer-bottom p {
  color: var(--color-text-on-dark-muted);
  font-size: 13px;
  line-height: 1.6;
}

.footer-bottom .copyright {
  margin-top: 4px;
  font-size: 12px;
  opacity: 0.7;
}

/* ==========================================================================
   响应式
   ========================================================================== */

@media (max-width: 1024px) {
  .dual-hero .container {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

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

  .topic-card-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

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

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

  .overview-card {
    grid-template-columns: 260px 1fr;
  }

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

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

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

  .guide-steps li {
    padding: 20px;
  }

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

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

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

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

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

  .footer-shell {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px 24px;
  }
}

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

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-bg-dark);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .site-nav .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 12px 16px 16px;
    gap: 0;
  }

  .site-nav .nav-list li a {
    padding: 14px 16px;
    font-size: 15px;
  }

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

  .site-nav.is-open {
    max-height: 420px;
  }

  .dual-hero {
    padding: 40px 16px;
  }

  .dual-hero .container {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-copy h1 {
    font-size: 26px;
  }

  .quick-access {
    padding: 20px;
  }

  .channel-band {
    padding: 40px 16px;
  }

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

  .latest-topic {
    padding: 40px 16px;
  }

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

  .hot-topics {
    padding: 40px 16px;
  }

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

  .guide-summary {
    padding: 40px 16px;
  }

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

  .faq-feedback {
    padding: 40px 16px;
  }

  .faq-feedback .container {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .inner-main {
    padding-left: 16px;
    padding-right: 16px;
    padding-top: 24px;
    padding-bottom: 40px;
  }

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

  .page-description {
    font-size: 15px;
  }

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

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

  .overview-text {
    padding: 20px;
  }

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

  .topic-list .video-card {
    flex-direction: column;
  }

  .topic-list .card-media {
    width: 100%;
  }

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

  .archive-item {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 16px;
  }

  .archive-number {
    justify-self: start;
  }

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

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

  .step-item {
    grid-template-columns: 40px 1fr;
    gap: 16px;
    padding: 20px;
  }

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

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

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

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

  .check-list li {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 16px 20px;
  }

  .method-item {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 20px;
  }

  .guide-figure img {
    aspect-ratio: 16 / 10;
  }

  .feedback-figure img {
    aspect-ratio: 16 / 9;
  }

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

  .footer-bottom {
    padding: 16px;
  }

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

  .error-code {
    font-size: 56px;
  }

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

  .error-actions .btn-primary,
  .error-actions a:not(.btn-primary) {
    justify-content: center;
  }
}

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

  .hero-copy h1 {
    font-size: 22px;
  }

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

  .quick-list a {
    padding: 12px 14px;
    font-size: 13px;
  }

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

/* ==========================================================================
   动效增强（不影响初始可见性）
   ========================================================================== */

@media (prefers-reduced-motion: no-preference) {
  .channel-card,
  .video-card,
  .topic-link-card,
  .type-card,
  .troubleshoot-card,
  .feedback-card,
  .method-item,
  .misconception-item {
    transition: box-shadow var(--transition-base), transform var(--transition-base),
      border-color var(--transition-base);
  }

  .channel-card:hover,
  .video-card:hover,
  .topic-link-card:hover {
    transform: translateY(-2px);
  }
}

/* ==========================================================================
   可访问性
   ========================================================================== */

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-accent-cyan);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}