/* ============================================================
   午夜影视 hsmwsm.com 全站样式表
   视觉方向：经典门户风 + 午夜观影氛围
   深色背景、金色强调、紧凑标题、多栏频道
   ============================================================ */

/* ============================================================
   1. base - 基础变量、重置与全局元素
   ============================================================ */
:root {
  --color-bg: #0d0f1a;
  --color-bg-alt: #141726;
  --color-surface: #1c1f2e;
  --color-surface-hover: #232738;
  --color-text: #f5f5f7;
  --color-text-secondary: #a8adb8;
  --color-text-muted: #8a8f98;
  --color-accent: #e6b31e;
  --color-accent-hover: #f0c53a;
  --color-border: #2c3042;
  --color-border-light: #353a50;

  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;

  --container-width: 1200px;
  --content-width: 1000px;

  --text-h1: 28px;
  --text-h2: 22px;
  --text-h3: 17px;
  --text-body: 16px;
  --text-small: 14px;
  --text-xs: 13px;

  --line-height-body: 1.6;
  --line-height-heading: 1.3;

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;

  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 20px;
  --space-lg: 32px;
  --space-xl: 48px;

  --header-height: 68px;
  --transition-base: 0.2s ease;
}

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

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

body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: var(--line-height-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul,
ol {
  list-style: none;
}

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

input,
textarea,
select {
  font-family: inherit;
  font-size: inherit;
}

figure {
  margin: 0;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-sans);
  line-height: var(--line-height-heading);
  font-weight: 600;
  color: var(--color-text);
}

h1 {
  font-size: var(--text-h1);
}

h2 {
  font-size: var(--text-h2);
}

h3 {
  font-size: var(--text-h3);
}

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

/* 焦点可见性 */
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ============================================================
   2. layout - 全站骨架布局
   ============================================================ */

/* 站点主体：内页统一背景与最小高度 */
.site-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
}

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

/* 内页统一容器 */
.inner-main {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* 1200px 统一容器 */
.container-1200 {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* 侧栏布局容器 */
.layout-shell {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: flex-start;
  gap: 32px;
}

/* 侧栏在左：侧栏在前，主内容在后 */
.sidebar-left {
  display: flex;
  align-items: flex-start;
  gap: 32px;
}

.sidebar-left > aside {
  flex: 0 0 260px;
  width: 260px;
  order: 0;
}

.sidebar-left > main,
.sidebar-left > .inner-main,
.sidebar-left > section {
  flex: 1 1 auto;
  min-width: 0;
  order: 1;
}

/* 引导页布局：主内容在左，aside 在右 */
.guide-layout {
  display: flex;
  align-items: flex-start;
  gap: 32px;
}

.guide-layout > main {
  flex: 1 1 auto;
  min-width: 0;
  order: 0;
}

.guide-layout > aside {
  flex: 0 0 300px;
  width: 300px;
  order: 1;
}

/* 页面标题区统一 */
.page-header {
  padding: 32px 0 24px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 32px;
}

.page-title {
  font-size: var(--text-h1);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
}

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

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0 0;
  font-size: var(--text-small);
  color: var(--color-text-muted);
}

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

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

.breadcrumb-sep {
  color: var(--color-text-muted);
  margin: 0 2px;
}

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

/* 区块标题统一 */
.section-title {
  font-size: var(--text-h2);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

.section-lead {
  font-size: var(--text-body);
  color: var(--text-secondary, var(--color-text-secondary));
  max-width: 760px;
  margin-bottom: 28px;
  line-height: var(--line-height-body);
}

/* 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: var(--text-small);
  font-weight: 500;
  line-height: 1.4;
  transition: background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base);
  border: 1px solid transparent;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #1a1a1a;
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

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

.btn-secondary:hover {
  background-color: rgba(230, 179, 30, 0.1);
}

.btn-text {
  background: none;
  border: none;
  color: var(--color-accent);
  padding: 10px 0;
}

.btn-text:hover {
  color: var(--color-accent-hover);
  background: none;
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-light);
  color: var(--color-text-secondary);
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  z-index: 100;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* 滚动入场动画 */
.reveal {
  opacity: 1;
  transform: none;
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.reveal.is-hidden {
  opacity: 0;
  transform: translateY(16px);
}

/* ============================================================
   3. components - 通用组件
   ============================================================ */

/* --- 页头 --- */
.site-header {
  background-color: var(--color-bg);
  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 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand-area {
  flex-shrink: 0;
}

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

.brand-name {
  font-family: var(--font-sans);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 1px;
}

.brand-tagline {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.site-nav {
  flex-shrink: 0;
}

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

.nav-item {
  list-style: none;
}

.nav-link {
  display: block;
  padding: 8px 14px;
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-base), background-color var(--transition-base);
}

.nav-link:hover {
  color: var(--color-text);
  background-color: rgba(255, 255, 255, 0.04);
}

.nav-link.is-current {
  color: var(--color-accent);
  background-color: rgba(230, 179, 30, 0.08);
}

/* 汉堡按钮，桌面隐藏 */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  gap: 5px;
  border-radius: var(--radius-sm);
  background: none;
  border: 1px solid var(--color-border);
  cursor: pointer;
  flex-shrink: 0;
}

.nav-toggle:hover {
  border-color: var(--color-accent);
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-text);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- 页脚 --- */
.site-footer {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  margin-top: 64px;
  padding: 48px 0 0;
}

.footer-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.2fr 1fr 1.2fr;
  gap: 40px;
}

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

.footer-title {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
}

.footer-text {
  font-size: var(--text-small);
  color: var(--color-text-muted);
  line-height: var(--line-height-body);
}

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

.footer-link {
  font-size: var(--text-small);
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

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

.footer-bottom {
  margin-top: 40px;
  padding: 16px 24px;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.copyright {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* --- 面包屑（组件级） --- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0 0;
  font-size: var(--text-small);
  color: var(--color-text-muted);
}

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

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

.breadcrumb-sep {
  color: var(--color-text-muted);
  margin: 0 2px;
}

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

/* --- FAQ 手风琴 --- */
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  margin-bottom: 12px;
  transition: border-color var(--transition-base);
}

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

.faq-question {
  padding: 16px 20px;
  font-size: var(--text-body);
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  list-style: none;
  transition: color var(--transition-base);
}

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

.faq-question::after {
  content: "+";
  font-size: 20px;
  color: var(--color-accent);
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

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

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

.faq-answer {
  padding: 0 20px 16px;
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
}

.faq-answer p {
  margin-bottom: 8px;
}

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

/* --- 相关链接条 --- */
.related-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding: 20px 0;
  margin-top: 24px;
  border-top: 1px solid var(--color-border);
}

.related-links-label {
  font-size: var(--text-small);
  color: var(--color-text-muted);
  font-weight: 500;
}

.related-links-item {
  font-size: var(--text-small);
  color: var(--color-accent);
  transition: color var(--transition-base);
}

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

/* --- 图片容器稳定约束 --- */
figure {
  overflow: hidden;
}

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

/* ============================================================
   4. pages - 各页面模块样式
   ============================================================ */

/* ========== 首页 index.html ========== */

/* 杂志目录首屏 */
.home-hero {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: 48px 0 56px;
}

.hero-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  align-items: stretch;
}

.hero-cover {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 340px;
  border: 1px solid var(--color-border);
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  inset: 0;
}

.hero-content {
  padding: 32px 0 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
}

.hero-title {
  font-size: 34px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 12px;
  line-height: 1.25;
}

.hero-slogan {
  font-size: 18px;
  color: var(--color-text);
  margin-bottom: 12px;
  font-weight: 500;
}

.hero-desc {
  font-size: var(--text-body);
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  line-height: var(--line-height-body);
  max-width: 460px;
}

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

.hero-directory {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  padding: 24px;
  display: flex;
  flex-direction: column;
}

.directory-head {
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.directory-label {
  font-size: var(--text-small);
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.directory-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.directory-item {
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base);
}

.directory-item:hover {
  background-color: rgba(255, 255, 255, 0.04);
}

.directory-link {
  display: block;
  padding: 12px 12px;
  font-size: var(--text-body);
  color: var(--color-text-secondary);
  transition: color var(--transition-base);
}

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

.directory-name {
  font-weight: 500;
}

.directory-desc {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* 通用首页区块 */
.home-section {
  padding: 56px 0;
}

.section-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

.section-head .section-title {
  margin-bottom: 8px;
}

.section-desc {
  font-size: var(--text-body);
  color: var(--color-text-secondary);
  max-width: 680px;
}

/* 频道分类总览 */
.channels-section {
  background-color: var(--color-bg);
}

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

.channel-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-base), transform var(--transition-base);
}

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

.channel-card .card-image {
  width: 100%;
  height: 160px;
  object-fit: cover;
}

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

.channel-card .card-title {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.channel-card .card-text {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
  margin-bottom: 14px;
}

.card-link {
  font-size: var(--text-small);
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition-base);
}

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

.card-link::after {
  content: "→";
  font-size: 14px;
  transition: transform var(--transition-base);
}

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

/* 专题片单推荐 */
.collections-section {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

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

.collection-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-base), transform var(--transition-base);
}

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

.collection-card .card-image {
  width: 100%;
  height: 140px;
  object-fit: cover;
}

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

.collection-card .card-title {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.collection-card .card-text {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
  margin-bottom: 12px;
}

/* 观影指南摘要 */
.guide-section {
  background-color: var(--color-bg);
}

.guide-wrap {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  align-items: center;
}

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

.step-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.step-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.step-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: rgba(230, 179, 30, 0.12);
  color: var(--color-accent);
  font-size: var(--text-body);
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.step-title {
  font-size: var(--text-body);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.step-text {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
}

.guide-entry {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  padding: 32px;
}

.entry-title {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

.entry-text {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
  margin-bottom: 20px;
}

.guide-entry .btn {
  margin-bottom: 8px;
}

/* 内容标准摘要 */
.standard-section {
  background-color: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

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

.standard-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: border-color var(--transition-base);
}

.standard-card:hover {
  border-color: var(--color-accent);
}

.standard-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background-color: rgba(230, 179, 30, 0.12);
  color: var(--color-accent);
  font-size: 20px;
  margin-bottom: 16px;
}

.standard-card .card-title {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.standard-card .card-text {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
}

.section-more {
  margin-top: 32px;
  text-align: center;
}

/* FAQ 精选 */
.faq-section {
  background-color: var(--color-bg);
}

.faq-section .faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-section .section-more {
  text-align: center;
}

/* ========== 频道分类页 channel.html ========== */

/* 左侧索引 */
.category-index {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.index-header {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.index-title {
  display: block;
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.index-sub {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.index-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 20px;
}

.index-item {
  border-radius: var(--radius-sm);
}

.index-link {
  display: block;
  padding: 10px 12px;
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.index-link:hover {
  background-color: rgba(255, 255, 255, 0.04);
  color: var(--color-text);
}

.index-link.is-active {
  background-color: rgba(230, 179, 30, 0.1);
  color: var(--color-accent);
  font-weight: 500;
}

.index-related {
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.index-related-text {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: 8px;
  line-height: 1.5;
}

.index-related-link {
  font-size: var(--text-small);
  color: var(--color-accent);
  transition: color var(--transition-base);
}

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

/* 频道详情 */
.category-detail {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 28px;
  padding: 32px 0;
  border-bottom: 1px solid var(--color-border);
  align-items: start;
}

.category-detail:first-of-type {
  padding-top: 0;
}

.category-detail:last-of-type {
  border-bottom: none;
}

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

.category-figure {
  aspect-ratio: 4 / 3;
}

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

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

.category-title {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

.category-text {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
  margin-bottom: 12px;
}

.category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
  margin-bottom: 16px;
}

.tag-item {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 4px 12px;
}

.category-link {
  font-size: var(--text-small);
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition-base);
}

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

.category-link::after {
  content: "→";
}

/* 频道页底部说明 */
.channel-note {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-top: 32px;
}

.channel-note-title {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

.channel-note-text {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
  margin-bottom: 12px;
}

.channel-note-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.note-link {
  font-size: var(--text-small);
  color: var(--color-accent);
  padding: 8px 16px;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-base), color var(--transition-base);
}

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

/* ========== 专题片单页 collection.html ========== */

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

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

/* 专题卡片（collection 页） */
.collection-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-base), transform var(--transition-base);
}

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

.collection-media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

.collection-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.collection-card:hover .collection-media img {
  transform: scale(1.03);
}

.collection-card-body {
  padding: 20px;
}

.collection-card-title {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.collection-card-desc {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
  margin-bottom: 16px;
}

.collection-card-link {
  font-size: var(--text-small);
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition-base);
}

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

.collection-card-link::after {
  content: "→";
}

/* 片单说明 */
.collection-note {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 48px;
}

.collection-note-content p {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
  margin-bottom: 12px;
}

.collection-note-content p:last-child {
  margin-bottom: 0;
}

/* 相关入口 */
.collection-links {
  margin-bottom: 24px;
}

.collection-links .related-links {
  border: none;
  padding: 0;
  gap: 12px;
}

.related-link {
  font-size: var(--text-small);
  color: var(--color-accent);
  padding: 10px 20px;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-base), color var(--transition-base);
}

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

/* ========== 观影指南页 guide.html ========== */

.guide-steps {
  margin-bottom: 40px;
}

.steps-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 32px;
}

.step-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
}

.step-number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: rgba(230, 179, 30, 0.12);
  color: var(--color-accent);
  font-size: var(--text-body);
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

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

.step-text {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
}

.guide-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  margin-top: 24px;
}

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

.guide-caption {
  padding: 12px 16px;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background-color: var(--color-surface);
}

/* 指南相关入口 */
.guide-related {
  margin-top: 40px;
}

.guide-related .related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  border: none;
  padding: 0;
}

/* 指南侧栏 */
.guide-notice {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.notice-title {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.notice-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 24px;
}

.notice-item {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-border);
}

.notice-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.notice-heading {
  font-size: var(--text-small);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.notice-text {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.notice-faq-link {
  display: block;
  text-align: center;
  font-size: var(--text-small);
  color: var(--color-accent);
  padding: 10px 0;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-base), color var(--transition-base);
}

.notice-faq-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-hover);
}

/* ========== 内容标准页 standard.html ========== */

.page-top {
  padding: 0;
}

.standard-layout {
  display: flex;
  align-items: flex-start;
  gap: 32px;
}

.standard-main {
  flex: 1 1 auto;
  min-width: 0;
}

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

/* 三栏原则 */
.principles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.principle-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: border-color var(--transition-base);
}

.principle-card:hover {
  border-color: var(--color-accent);
}

.principle-title {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
}

.principle-text {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
}

/* 流程 */
.process-figure {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  margin-bottom: 24px;
}

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

.figure-caption {
  padding: 10px 16px;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background-color: var(--color-surface);
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.process-step {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  text-align: left;
  position: relative;
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: rgba(230, 179, 30, 0.12);
  color: var(--color-accent);
  font-size: var(--text-small);
  font-weight: 600;
  margin-bottom: 12px;
}

.step-title {
  display: block;
  font-size: var(--text-small);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
}

.step-text {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* 维护说明 */
.maintenance-content {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.maintenance-text {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
  margin-bottom: 12px;
}

.maintenance-text:last-child {
  margin-bottom: 0;
}

/* 相关入口 */
.related-section .related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  border: none;
  padding: 0;
}

/* ========== 常见问题页 faq.html ========== */

/* 侧栏分类 */
.faq-nav {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: sticky;
  top: calc(var(--header-height) + 20px);
}

.aside-title {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.faq-category-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 24px;
}

.faq-category-item {
  border-radius: var(--radius-sm);
}

.faq-category-link {
  display: block;
  padding: 10px 12px;
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-base), color var(--transition-base);
}

.faq-category-link:hover {
  background-color: rgba(255, 255, 255, 0.04);
  color: var(--color-text);
}

.faq-aside-figure {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.faq-aside-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.faq-aside-caption {
  padding: 10px 12px;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background-color: var(--color-bg);
}

/* 问答列表 */
.faq-group {
  margin-bottom: 40px;
}

.faq-group-title {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.faq-inline-link {
  font-size: var(--text-xs);
  color: var(--color-accent);
  text-decoration: underline;
  transition: color var(--transition-base);
}

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

/* 更多帮助 */
.faq-more-help {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 32px;
}

.faq-more-text {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  margin-bottom: 16px;
}

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

.faq-more-link {
  font-size: var(--text-small);
  color: var(--color-accent);
  padding: 8px 16px;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-base), color var(--transition-base);
}

.faq-more-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-hover);
}

/* ========== 关于本站 about.html ========== */

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

/* 站点定位 */
.intro-section {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 32px;
  align-items: start;
}

.intro-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.about-figure {
  aspect-ratio: 4 / 3;
}

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

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

.intro-content .section-title {
  margin-bottom: 16px;
}

.section-text {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-body);
  margin-bottom: 14px;
}

.section-text:last-child {
  margin-bottom: 0;
}

/* 内容边界 */
.boundaries-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

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

.boundary-card .card-title {
  font-size: var(--text-h3);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.boundary-support .card-title {
  color: var(--color-accent);
}

.boundary-unsupport .card-title {
  color: var(--color-text);
}

.boundary-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.boundary-item {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  line-height: 1.5;
  padding-left: 20px;
  position: relative;
}

.boundary-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-accent);
}

.boundary-unsupport .boundary-item::before {
  background-color: var(--color-text-muted);
}

/* 反馈渠道 */
.feedback-section {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}

.feedback-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.text-link {
  font-size: var(--text-small);
  color: var(--color-accent);
  padding: 8px 16px;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-base), color var(--transition-base);
}

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

/* ========== 404 页面 ========== */

.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 48px 24px;
}

.error-panel {
  text-align: center;
  max-width: 520px;
  padding: 48px 32px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.error-code {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: var(--text-h2);
  color: var(--color-text);
  margin-bottom: 12px;
}

.error-desc {
  font-size: var(--text-small);
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  line-height: var(--line-height-body);
}

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

.btn-home,
.btn-channel {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: var(--text-small);
  font-weight: 500;
  transition: background-color var(--transition-base), border-color var(--transition-base), color var(--transition-base);
}

.btn-home {
  background-color: var(--color-accent);
  color: #1a1a1a;
  border: 1px solid var(--color-accent);
}

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

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

.btn-channel:hover {
  background-color: rgba(230, 179, 30, 0.1);
}

/* ============================================================
   5. responsive - 响应式断点
   ============================================================ */

/* 平板 */
@media (max-width: 1024px) {
  .channel-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .process-steps {
    grid-template-columns: repeat(3, 1fr);
  }

  .process-step:nth-child(4),
  .process-step:nth-child(5) {
    grid-column: span 1;
  }

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

  .guide-wrap {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .intro-section {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .category-detail {
    grid-template-columns: 200px 1fr;
    gap: 20px;
  }

  .sidebar-left {
    gap: 20px;
  }

  .sidebar-left > aside {
    flex-basis: 220px;
    width: 220px;
  }

  .guide-layout {
    gap: 20px;
  }

  .guide-layout > aside {
    flex-basis: 260px;
    width: 260px;
  }
}

/* 手机 */
@media (max-width: 768px) {
  :root {
    --header-height: 60px;
  }

  .header-inner {
    height: var(--header-height);
    padding: 0 16px;
    gap: 12px;
  }

  .brand-tagline {
    display: none;
  }

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

  /* 汉堡按钮显示 */
  .nav-toggle {
    display: flex;
  }

  /* 导航列表默认收起 */
  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

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

  .nav-list.is-open {
    max-height: none;
  }

  .site-nav.is-open {
    max-height: 480px;
    overflow-y: auto;
  }

  .nav-item {
    border-bottom: 1px solid var(--color-border);
  }

  .nav-item:last-child {
    border-bottom: none;
  }

  .nav-link {
    padding: 14px 20px;
    font-size: var(--text-body);
    border-radius: 0;
  }

  .nav-link.is-current {
    background-color: rgba(230, 179, 30, 0.08);
  }

  /* 内页容器 */
  .inner-main,
  .container-1200,
  .layout-shell {
    padding: 0 16px;
  }

  /* 面包屑 */
  .breadcrumb {
    padding: 16px 0 0;
    font-size: var(--text-xs);
  }

  /* 页面标题 */
  .page-header {
    padding: 24px 0 20px;
    margin-bottom: 24px;
  }

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

  .page-description {
    font-size: var(--text-small);
  }

  /* 侧栏布局：手机端主内容在前 */
  .sidebar-left,
  .guide-layout {
    flex-direction: column;
    gap: 24px;
  }

  .sidebar-left > aside,
  .sidebar-left > main,
  .sidebar-left > .inner-main,
  .sidebar-left > section,
  .guide-layout > main,
  .guide-layout > aside {
    flex: 1 1 auto;
    width: 100%;
    order: 0;
  }

  /* 手机端辅助侧栏排到主内容之后 */
  .sidebar-left > aside,
  .guide-layout > aside {
    order: 2;
  }

  .sidebar-left > main,
  .sidebar-left > .inner-main,
  .sidebar-left > section,
  .guide-layout > main {
    order: 1;
  }

  /* 侧栏不再吸顶 */
  .category-index,
  .guide-notice,
  .faq-nav {
    position: static;
  }

  /* 首页 hero */
  .home-hero {
    padding: 24px 0 32px;
  }

  .hero-container {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 0 16px;
  }

  .hero-cover {
    min-height: 200px;
    order: 0;
  }

  .hero-image {
    position: static;
    height: 100%;
  }

  .hero-content {
    padding: 16px 0 0;
    order: 1;
  }

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

  .hero-slogan {
    font-size: var(--text-body);
  }

  .hero-desc {
    font-size: var(--text-small);
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-directory {
    order: 2;
    margin-top: 8px;
  }

  /* 首页区块 */
  .home-section {
    padding: 40px 0;
  }

  .section-container {
    padding: 0 16px;
  }

  .section-head {
    margin-bottom: 24px;
  }

  /* 卡片网格：手机单列 */
  .channel-grid,
  .collection-grid,
  .collection-cards,
  .standard-grid,
  .principles-grid,
  .boundaries-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .channel-card .card-image {
    height: 140px;
  }

  .collection-card .card-image {
    height: 120px;
  }

  /* 指南 */
  .guide-wrap {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .step-item {
    padding: 16px;
  }

  .step-num {
    width: 32px;
    height: 32px;
    font-size: var(--text-small);
  }

  /* 频道详情 */
  .category-detail {
    grid-template-columns: 1fr;
    gap: 16px;
  }

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

  .category-tags {
    gap: 6px;
  }

  .tag-item {
    font-size: var(--text-xs);
    padding: 3px 10px;
  }

  /* 流程步骤 */
  .process-steps {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .process-step {
    padding: 16px;
  }

  /* FAQ */
  .faq-question {
    padding: 14px 16px;
    font-size: var(--text-small);
  }

  .faq-answer {
    padding: 0 16px 14px;
  }

  /* 页脚 */
  .site-footer {
    padding-top: 32px;
    margin-top: 40px;
  }

  .footer-container {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 0 16px;
  }

  .footer-bottom {
    margin-top: 24px;
    padding: 12px 16px;
  }

  /* 相关链接 */
  .related-links {
    gap: 12px;
    padding: 16px 0;
  }

  /* 404 */
  .error-panel {
    padding: 32px 20px;
  }

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

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

  .btn-home,
  .btn-channel {
    width: 100%;
  }

  /* 返回顶部按钮 */
  .back-to-top {
    right: 16px;
    bottom: 16px;
    width: 40px;
    height: 40px;
  }
}

/* 小手机 */
@media (max-width: 390px) {
  .brand-name {
    font-size: 17px;
  }

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

  .section-title {
    font-size: 20px;
  }

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

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

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

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

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

  .process-steps {
    grid-template-columns: 1fr;
  }

  .category-detail {
    grid-template-columns: 1fr;
  }

  .intro-section {
    grid-template-columns: 1fr;
  }

  .footer-container {
    grid-template-columns: 1fr;
  }
}

/* 打印 */
@media print {
  .site-header,
  .site-footer,
  .nav-toggle,
  .back-to-top,
  .related-links,
  .breadcrumb {
    display: none !important;
  }

  body {
    background-color: #fff;
    color: #000;
  }

  .site-main,
  .inner-main,
  .layout-shell,
  .container-1200 {
    max-width: 100%;
    padding: 0;
  }
}

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

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