/* ============================================================
   糖豆视频 · 整站样式表
   瑞士网格风 · 深色背景 + 琥珀色高亮
   ============================================================ */

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

:root {
  --bg-dark: #0f1722;
  --bg-card: #2a3441;
  --bg-elevated: #1c2530;
  --text-light: #f5f1e8;
  --text-muted: #8fa3b0;
  --accent: #e8b64c;
  --accent-soft: rgba(232, 182, 76, 0.12);
  --border-line: rgba(245, 241, 232, 0.1);
  --border-accent: rgba(232, 182, 76, 0.4);
  --font-sans: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --container-w: 1200px;
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --header-h: 64px;
  --transition-fast: 0.2s ease;
  --transition-slow: 0.35s ease;
}

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

html {
  font-size: 15px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-dark);
  color: var(--text-light);
  line-height: 1.8;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  line-height: 1.4;
  font-weight: 600;
}

h1 {
  font-size: 28px;
}

h2 {
  font-size: 22px;
}

h3 {
  font-size: 18px;
}

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

time {
  color: var(--text-muted);
  font-size: 13px;
}

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--bg-dark);
}

.site-home {
  background-color: var(--bg-dark);
}

.site-inner {
  background-color: var(--bg-dark);
}

.site-error {
  background-color: var(--bg-dark);
}

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

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

.home-main {
  width: 100%;
}

.inner-main {
  width: 100%;
}

/* 主容器 */
.header-inner,
.footer-inner,
.hero-focus,
.section-block,
.page-layout,
.guide-help-aside .layout-shell,
.feedback-entry-inner {
  width: 100%;
  max-width: var(--container-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 内页两栏布局 */
.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 48px;
  padding-top: 32px;
  padding-bottom: 64px;
  align-items: start;
}

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

/* 侧栏通用 */
.sidebar,
.sidebar-content {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* 内页主容器 */
.inner-main .page-layout,
.inner-main .layout-shell {
  width: 100%;
  max-width: var(--container-w);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ============================================================
   Header / 导航
   ============================================================ */

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

.header-inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.brand-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-light);
  letter-spacing: 0.02em;
  border-left: 3px solid var(--accent);
  padding-left: 10px;
  line-height: 1.3;
}

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

.site-nav {
  display: flex;
  align-items: center;
}

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

.nav-list li {
  position: relative;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-list a:hover {
  color: var(--text-light);
  background-color: rgba(245, 241, 232, 0.06);
}

.nav-list a.is-current {
  color: var(--accent);
  background-color: var(--accent-soft);
}

.nav-list a.is-current::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 2px;
  background-color: var(--accent);
  border-radius: 1px;
}

/* 汉堡按钮（默认隐藏） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-shrink: 0;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-light);
  border-radius: 1px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

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

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--text-muted);
}

.breadcrumb a {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

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

.breadcrumb-sep {
  color: var(--text-muted);
  opacity: 0.6;
}

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

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

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

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-light);
  line-height: 1.4;
  margin-bottom: 10px;
}

.page-description {
  font-size: 15px;
  color: var(--text-muted);
  max-width: 720px;
  line-height: 1.8;
}

/* ============================================================
   首页 Hero
   ============================================================ */

.hero-focus {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
  padding-top: 56px;
  padding-bottom: 56px;
}

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

.hero-figure {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--bg-card);
  aspect-ratio: 16 / 10;
}

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

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

.hero-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-light);
  line-height: 1.35;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 24px;
  max-width: 480px;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  background-color: var(--accent-soft);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
}

.hero-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  color: var(--bg-dark);
  background-color: var(--accent);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.hero-cta:hover {
  background-color: #d4a63a;
  color: var(--bg-dark);
  transform: translateY(-1px);
}

/* ============================================================
   通用区块
   ============================================================ */

.section-block {
  padding-top: 48px;
  padding-bottom: 48px;
}

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

.section-heading h2 {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 8px;
}

.section-desc {
  font-size: 15px;
  color: var(--text-muted);
  max-width: 640px;
  line-height: 1.8;
}

.section-title {
  font-size: 22px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 12px;
}

.section-intro {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
  max-width: 720px;
  margin-bottom: 24px;
}

.section-lead {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 24px;
}

.section-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 28px;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  transition: gap var(--transition-fast);
}

.section-link:hover {
  gap: 10px;
  color: var(--accent);
}

/* ============================================================
   首页频道分类总览
   ============================================================ */

.channel-overview {
  border-top: 1px solid var(--border-line);
}

.channel-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.channel-item {
  display: grid;
  grid-template-columns: 72px minmax(140px, 200px) minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-line);
  transition: background-color var(--transition-fast);
  position: relative;
}

.channel-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent);
  transition: width var(--transition-slow);
}

.channel-item:hover::before {
  width: 100%;
}

.channel-number {
  font-family: "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.channel-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-light);
  line-height: 1.4;
}

.channel-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  min-width: 0;
}

.channel-link {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  white-space: nowrap;
  padding: 6px 12px;
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.channel-link:hover {
  background-color: var(--accent-soft);
  color: var(--accent);
}

/* ============================================================
   首页精选专题片单
   ============================================================ */

.special-highlight {
  border-top: 1px solid var(--border-line);
}

.special-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

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

.special-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent);
  z-index: 2;
  transition: width var(--transition-slow);
}

.special-card:hover::before {
  width: 100%;
}

.special-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.3);
}

.special-figure {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--bg-elevated);
}

.special-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

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

.special-card h3.special-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-light);
  padding: 16px 16px 4px;
  line-height: 1.4;
}

.special-topic {
  font-size: 14px;
  color: var(--text-muted);
  padding: 0 16px;
  line-height: 1.6;
}

.special-scene {
  font-size: 13px;
  color: var(--text-muted);
  padding: 8px 16px 16px;
  line-height: 1.6;
  margin-top: auto;
}

/* ============================================================
   首页观看指南入口
   ============================================================ */

.guide-preview {
  border-top: 1px solid var(--border-line);
}

.guide-steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.guide-step {
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
  transition: background-color var(--transition-fast);
}

.guide-step:hover {
  background-color: var(--bg-elevated);
}

.guide-step .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  background-color: var(--accent-soft);
}

.guide-step .step-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 8px;
  line-height: 1.4;
}

.guide-step .step-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ============================================================
   首页更新动态摘要
   ============================================================ */

.update-summary {
  border-top: 1px solid var(--border-line);
}

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

.update-item {
  display: grid;
  grid-template-columns: 120px 160px minmax(0, 1fr);
  gap: 24px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-line);
}

.update-date {
  font-size: 13px;
  color: var(--text-muted);
  font-family: "Helvetica Neue", Arial, sans-serif;
}

.update-target {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-light);
}

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

/* ============================================================
   首页问题反馈入口
   ============================================================ */

.feedback-entry {
  border-top: 1px solid var(--border-line);
}

.feedback-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.feedback-card {
  display: block;
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
  border: 1px solid transparent;
}

.feedback-card:hover {
  background-color: var(--bg-elevated);
  border-color: var(--border-accent);
}

.feedback-card-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 8px;
}

.feedback-card-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ============================================================
   频道分类页
   ============================================================ */

.channel-list-section {
  margin-bottom: 48px;
}

.channel-list-section .channel-list {
  margin-top: 24px;
}

.channel-list-section .channel-item {
  grid-template-columns: 72px minmax(140px, 200px) minmax(0, 1fr) auto;
}

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

.channel-info .channel-desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

.relation-section {
  border-top: 1px solid var(--border-line);
  padding-top: 40px;
}

.relation-figure {
  margin-top: 24px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--bg-card);
  max-width: 640px;
}

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

.relation-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--text-muted);
  background-color: var(--bg-elevated);
}

/* 侧栏卡片 */
.sidebar-card {
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sidebar-card h3,
.sidebar-card h2.sidebar-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 12px;
  line-height: 1.4;
}

.sidebar-card .sidebar-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.sidebar-card .sidebar-link {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  padding: 6px 0;
}

.sidebar-card .sidebar-link:hover {
  color: var(--accent);
  text-decoration: underline;
}

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

.special-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
  border-bottom: 1px solid var(--border-line);
}

.intro-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--bg-card);
  aspect-ratio: 16 / 10;
}

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

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

.intro-text {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-top: 12px;
}

.special-grid-section {
  border-bottom: 1px solid var(--border-line);
}

.special-grid-section .special-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.special-grid-section .special-card {
  display: grid;
  grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
  gap: 0;
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.card-media {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background-color: var(--bg-elevated);
  height: 100%;
}

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

.card-body {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.card-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-light);
  line-height: 1.4;
}

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

.card-scene {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: auto;
}

.scene-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  color: var(--accent);
  background-color: var(--accent-soft);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  margin-right: 6px;
}

.card-link {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  margin-top: 4px;
}

.card-link:hover {
  text-decoration: underline;
}

.special-method-section {
  border-bottom: none;
}

.method-wrapper {
  max-width: 760px;
}

.method-text {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-top: 12px;
}

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

.guide-steps-section {
  margin-bottom: 48px;
}

.guide-steps-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 24px;
}

.guide-step-item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--border-line);
}

.guide-step-item .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  background-color: var(--accent-soft);
}

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

.step-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 8px;
}

.step-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 8px;
}

.guide-relation-section {
  border-top: 1px solid var(--border-line);
  padding-top: 40px;
  margin-bottom: 48px;
}

.guide-figure {
  margin-top: 24px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--bg-card);
  max-width: 640px;
}

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

.guide-figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--text-muted);
  background-color: var(--bg-elevated);
}

.guide-checklist-section {
  margin-bottom: 48px;
}

.guide-checklist {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}

.checklist-item {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 16px;
  align-items: flex-start;
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 20px;
}

.checklist-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-accent);
  border-radius: var(--radius-sm);
  margin-top: 2px;
  flex-shrink: 0;
}

.checklist-text {
  min-width: 0;
}

.checklist-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 6px;
}

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

.checklist-desc a {
  color: var(--accent);
}

.checklist-desc a:hover {
  text-decoration: underline;
}

/* 观看指南页侧栏布局 */
.guide-help-aside {
  width: 100%;
  border-top: 1px solid var(--border-line);
  margin-top: 48px;
}

.guide-help-aside .layout-shell {
  padding-top: 48px;
  padding-bottom: 64px;
}

.guide-help-aside .page-layout.with-aside {
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 48px;
}

.aside-intro {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 24px;
}

.aside-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.aside-card {
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 24px;
}

.aside-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 12px;
}

.aside-card-text {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.aside-card-link {
  display: inline-flex;
  align-items: center;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
}

.aside-card-link:hover {
  text-decoration: underline;
}

/* ============================================================
   更新记录页
   ============================================================ */

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

.content-media-inline {
  margin: 24px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--bg-card);
  max-width: 640px;
}

.content-media-inline img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.content-media-inline figcaption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--text-muted);
  background-color: var(--bg-elevated);
}

.update-month-group {
  margin-top: 32px;
}

.month-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-light);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-accent);
  margin-bottom: 8px;
}

.update-month-group .update-list {
  margin-top: 0;
}

.update-month-group .update-item {
  grid-template-columns: 110px 160px minmax(0, 1fr);
}

.updates-note {
  border-top: 1px solid var(--border-line);
  padding-top: 40px;
}

.updates-note p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 12px;
  max-width: 720px;
}

/* ============================================================
   内容说明页
   ============================================================ */

.about-section {
  border-bottom: 1px solid var(--border-line);
  padding: 40px 0;
}

.about-section:first-of-type {
  padding-top: 0;
}

.about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

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

.about-copy p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 12px;
  max-width: 640px;
}

.position-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 8px;
}

.position-tag {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  background-color: var(--accent-soft);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 24px;
}

.principle-card {
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 24px;
  position: relative;
}

.principle-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  background-color: var(--accent-soft);
  margin-bottom: 16px;
}

.principle-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 10px;
}

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

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 24px;
}

.boundary-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  align-items: flex-start;
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  padding: 20px;
}

.boundary-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  background-color: var(--accent-soft);
  flex-shrink: 0;
}

.boundary-intro {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

.related-intro {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
  max-width: 640px;
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.related-link {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--accent);
  background-color: var(--accent-soft);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.related-link:hover {
  background-color: rgba(232, 182, 76, 0.22);
  color: var(--accent);
}

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

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 24px;
}

.faq-item {
  background-color: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid transparent;
  transition: border-color var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--border-accent);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-light);
  cursor: pointer;
  list-style: none;
  min-height: 44px;
  transition: color var(--transition-fast);
}

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

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

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

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

.faq-answer {
  padding: 0 20px 20px;
}

.faq-answer p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
}

/* 反馈页侧栏 */
.sidebar-content .sidebar-card {
  margin-bottom: 0;
}

.sidebar-content .sidebar-card h2.sidebar-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 16px;
}

.sidebar-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.sidebar-list li {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  padding-left: 18px;
  position: relative;
}

.sidebar-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background-color: var(--accent);
  border-radius: 1px;
}

.sidebar-note {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px solid var(--border-line);
  padding-top: 12px;
}

.sidebar-links p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 8px;
}

.sidebar-links p a {
  color: var(--accent);
}

.sidebar-links p a:hover {
  text-decoration: underline;
}

/* 反馈页底部引导区 */
.feedback-entry-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
  gap: 48px;
  align-items: center;
  padding-top: 48px;
  padding-bottom: 48px;
  border-top: 1px solid var(--border-line);
}

.feedback-entry-text {
  min-width: 0;
}

.feedback-entry-text .section-title {
  margin-bottom: 12px;
}

.feedback-entry-text p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
  max-width: 560px;
}

.feedback-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--bg-card);
}

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

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

/* ============================================================
   404 页
   ============================================================ */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  flex: 1;
}

.error-panel {
  max-width: 560px;
  width: 100%;
  text-align: center;
}

.error-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-md);
  background-color: var(--accent-soft);
  margin-bottom: 24px;
}

.error-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-light);
  margin-bottom: 12px;
}

.error-desc {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.8;
  margin-bottom: 32px;
}

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

.error-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.error-link:first-child {
  color: var(--bg-dark);
  background-color: var(--accent);
}

.error-link:first-child:hover {
  background-color: #d4a63a;
  color: var(--bg-dark);
}

.error-link:last-child {
  color: var(--text-light);
  border: 1px solid var(--border-line);
}

.error-link:last-child:hover {
  border-color: var(--border-accent);
  color: var(--accent);
}

/* ============================================================
   Footer
   ============================================================ */

.site-footer {
  background-color: var(--bg-dark);
  border-top: 1px solid var(--border-line);
  margin-top: auto;
}

.footer-inner {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 40px;
  padding-top: 48px;
  padding-bottom: 40px;
}

.footer-col {
  min-width: 0;
}

.footer-heading {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-line);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-links a {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid var(--border-line);
  padding: 20px 24px;
  text-align: center;
}

.footer-copy {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.footer-tagline {
  font-size: 13px;
  color: var(--text-muted);
  opacity: 0.7;
}

/* ============================================================
   滚动渐入动画（增强，不影响初始可见性）
   ============================================================ */

.reveal-visible {
  animation: fadeUp 0.5s ease both;
}

@keyframes fadeUp {
  from {
    opacity: 0.6;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 1024px) {
  .special-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .guide-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .special-grid-section .special-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .special-grid-section .special-card {
    grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 36px;
  }

  .guide-help-aside .page-layout.with-aside {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 36px;
  }

  .footer-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .header-inner {
    height: auto;
    min-height: var(--header-h);
    padding-top: 8px;
    padding-bottom: 8px;
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: flex;
    order: 3;
  }

  .site-nav {
    order: 4;
    width: 100%;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    gap: 0;
    width: 100%;
    padding: 8px 0;
  }

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

  .nav-list a {
    display: block;
    padding: 12px 16px;
    font-size: 15px;
    border-radius: var(--radius-sm);
  }

  .nav-list a.is-current::after {
    display: none;
  }

  .hero-focus {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding-top: 32px;
    padding-bottom: 32px;
  }

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

  .section-block {
    padding-top: 36px;
    padding-bottom: 36px;
  }

  .channel-item {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 12px 16px;
    padding: 16px 0;
  }

  .channel-item .channel-number {
    grid-row: 1;
  }

  .channel-item .channel-name {
    grid-column: 2;
  }

  .channel-item .channel-desc {
    grid-column: 2;
  }

  .channel-item .channel-link {
    grid-column: 2;
    justify-self: flex-start;
  }

  .special-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }

  .guide-steps {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .update-item {
    grid-template-columns: 100px minmax(0, 1fr);
    gap: 8px 16px;
  }

  .update-date {
    grid-row: 1;
  }

  .update-target {
    grid-column: 2;
  }

  .update-desc {
    grid-column: 2;
  }

  .feedback-cards {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .page-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding-top: 24px;
  }

  .sidebar,
  .sidebar-content {
    order: 2;
  }

  .special-intro {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .special-grid-section .special-card {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .guide-step-item {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 16px;
    padding: 20px 0;
  }

  .guide-step-item .step-number {
    width: 40px;
    height: 40px;
    font-size: 14px;
  }

  .checklist-item {
    grid-template-columns: 24px minmax(0, 1fr);
    gap: 12px;
    padding: 16px;
  }

  .guide-help-aside .page-layout.with-aside {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .about-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .principle-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .feedback-entry-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
    padding-top: 36px;
    padding-bottom: 28px;
  }

  .update-month-group .update-item {
    grid-template-columns: 90px minmax(0, 1fr);
  }

  .error-main {
    padding: 48px 24px;
  }

  .error-panel {
    text-align: left;
  }

  .error-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 480px) {
  .header-inner,
  .footer-inner,
  .hero-focus,
  .section-block,
  .page-layout,
  .guide-help-aside .layout-shell,
  .feedback-entry-inner {
    padding-left: 16px;
    padding-right: 16px;
  }

  .brand-name {
    font-size: 18px;
  }

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

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

  .channel-item {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 8px 12px;
  }

  .channel-name {
    font-size: 16px;
  }

  .special-card h3.special-name {
    font-size: 16px;
  }

  .guide-step {
    padding: 20px;
  }

  .update-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .update-date {
    grid-row: auto;
    grid-column: auto;
  }

  .update-target {
    grid-column: auto;
  }

  .update-desc {
    grid-column: auto;
  }

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

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

  .guide-step-item {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
    padding: 16px 0;
  }

  .step-title {
    font-size: 16px;
  }

  .checklist-item {
    grid-template-columns: 20px minmax(0, 1fr);
    gap: 10px;
    padding: 14px;
  }

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

  .faq-answer {
    padding: 0 16px 16px;
  }

  .sidebar-card {
    padding: 20px;
  }

  .error-code {
    width: 60px;
    height: 60px;
    font-size: 24px;
  }

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

  .error-link {
    width: 100%;
  }
}