/* ==========================================================================
   爱情岛 zhihuikangyuan.com 全站样式
   设计方向：高端服务风 · 深色文字 · 低饱和点缀 · 精细间距
   ========================================================================== */

/* ==========================================================================
   Base — 基础变量、重置、全局字体与颜色
   ========================================================================== */

:root {
  --color-text: #1f2937;
  --color-text-secondary: #6b7280;
  --color-bg: #f9fafb;
  --color-card: #ffffff;
  --color-accent: #0e7490;
  --color-border: #e5e7eb;
  --color-accent-light: #ecfeff;
  --color-accent-dark: #155e75;
  --color-warning-bg: #fff7ed;
  --color-warning-border: #fed7aa;
  --color-warning-text: #9a3412;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --container-width: 1200px;
  --header-height: 64px;
  --radius: 8px;
  --shadow-card: 0 1px 3px rgba(31, 41, 55, 0.06), 0 4px 12px rgba(31, 41, 55, 0.04);
  --shadow-card-hover: 0 4px 8px rgba(31, 41, 55, 0.08), 0 12px 24px rgba(31, 41, 55, 0.06);
  --section-space: 72px;
}

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

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

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.7;
  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: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4 {
  line-height: 1.3;
  font-weight: 600;
  color: var(--color-text);
}

h1 {
  font-size: 36px;
  font-weight: 700;
}

h2 {
  font-size: 24px;
  font-weight: 600;
}

h3 {
  font-size: 20px;
  font-weight: 600;
}

p {
  margin-bottom: 1em;
}

p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   Layout — 全站骨架：页头、页脚、主容器、面包屑、页面标题区
   ========================================================================== */

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

.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;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-text {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

.logo-text::first-letter {
  color: var(--color-accent);
}

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

.site-nav .nav-list a {
  display: block;
  padding: 8px 16px;
  font-size: 15px;
  color: var(--color-text-secondary);
  border-radius: 6px;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.site-nav .nav-list a:hover {
  color: var(--color-accent);
  background-color: var(--color-accent-light);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: none;
  background: transparent;
  cursor: pointer;
  gap: 5px;
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

/* 主内容容器 */
.site-main {
  min-height: 60vh;
}

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

.inner-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px 64px;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 0 0;
  font-size: 14px;
  color: var(--color-text-secondary);
}

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

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

.breadcrumb-sep {
  color: var(--color-border);
  user-select: none;
}

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

/* 页面标题区（内页统一） */
.page-header {
  padding: 32px 0 36px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 48px;
}

.page-title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 12px;
}

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

/* 页脚 */
.site-footer {
  background-color: var(--color-card);
  border-top: 1px solid var(--color-border);
  margin-top: 80px;
}

.footer-inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px 32px;
  text-align: center;
}

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

.footer-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.footer-nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-bottom: 24px;
}

.footer-nav a {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: 4px 0;
}

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

.footer-copyright {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 4px;
}

.footer-legal {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   Components — 通用组件：按钮、区块标题、卡片、FAQ、步骤、清单
   ========================================================================== */

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.4;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  min-height: 44px;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--color-accent-dark);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(14, 116, 144, 0.25);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

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

/* 区块通用 */
.section-block {
  padding: var(--section-space) 0;
}

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

.section-head .section-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 8px;
}

.section-head .section-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  max-width: 680px;
}

.section-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 12px;
}

.section-intro {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
  max-width: 720px;
}

/* 卡片通用 */
.channel-card,
.topic-card,
.special-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.channel-card:hover,
.topic-card:hover,
.special-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

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

.card-title {
  font-size: 18px;
  font-weight: 600;
  margin: 16px 20px 8px;
}

.card-text {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0 20px 16px;
}

.card-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  margin: 0 20px 20px;
  color: var(--color-accent);
}

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

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

.faq-item summary {
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 48px;
  transition: color 0.2s ease;
}

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

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 400;
  color: var(--color-text-secondary);
  transition: transform 0.25s ease;
}

.faq-item[open] summary {
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-border);
}

.faq-item[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
  color: var(--color-accent);
}

.faq-item p {
  padding: 16px 24px 20px;
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

/* 内容配图 */
.content-media {
  margin-bottom: 24px;
}

.content-media img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: var(--radius);
}

.content-media figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  text-align: center;
  padding: 10px 0 0;
}

/* 相关链接 */
.related-links li {
  margin-bottom: 12px;
}

.related-links a {
  font-size: 15px;
  color: var(--color-accent);
}

.related-links a:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

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

/* Hero 焦点区 */
.hero-section {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
  padding: 72px 0 80px;
}

.hero-content {
  max-width: 560px;
}

.hero-title {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 17px;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-media {
  margin: 0;
}

.hero-media img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
}

/* 频道分类概览 */
.channel-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* 专题片单预览 */
.topic-scroll {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* 观看指南摘要 */
.steps-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.step-item {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: box-shadow 0.25s ease, transform 0.25s ease;
}

.step-item:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
}

.step-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.step-text {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

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

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

/* 内容解读入口 */
.insight-promo {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 48px;
  margin: 24px 0 0;
}

.insight-inner {
  max-width: 640px;
}

.insight-inner .section-title {
  font-size: 26px;
  margin-bottom: 16px;
}

.insight-text {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 24px;
}

/* FAQ 摘要 */
.faq-list {
  margin-bottom: 24px;
}

.faq-more-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-accent);
}

.faq-more-link:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

/* ==========================================================================
   Pages — 内页通用
   ========================================================================== */

/* pindao.html — 频道分类 */
.channel-grid-section {
  margin-bottom: 56px;
}

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

.channel-grid .channel-card {
  padding: 0;
}

.channel-figure {
  margin: 0;
}

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

.channel-name {
  font-size: 18px;
  font-weight: 600;
  margin: 20px 24px 8px;
}

.channel-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0 24px 12px;
}

.channel-audience {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin: 0 24px 20px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

.channel-audience strong {
  color: var(--color-text);
  font-weight: 600;
}

.selection-advice {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 40px;
}

.advice-intro {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.advice-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.advice-list li {
  padding: 12px 16px;
  background-color: var(--color-bg);
  border-radius: var(--radius);
  font-size: 15px;
}

.advice-list a {
  color: var(--color-accent);
  font-weight: 500;
}

.advice-list a:hover {
  color: var(--color-accent-dark);
}

.advice-more {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.advice-more a {
  color: var(--color-accent);
}

/* zhuanti.html — 专题推荐 */
.section {
  margin-bottom: 56px;
}

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

.special-card {
  display: flex;
  flex-direction: column;
}

.special-media {
  margin: 0;
}

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

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

.special-name {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.special-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
  flex: 1;
}

.special-audience {
  font-size: 13px;
  color: var(--color-text-secondary);
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

.special-audience strong {
  color: var(--color-text);
  font-weight: 600;
}

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

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

.advice-title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-accent);
}

.advice-text {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin: 0;
}

.advice-note {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-top: 24px;
}

.advice-note a {
  color: var(--color-accent);
}

/* zhinan.html — 观看指南 */
.guide-steps-section {
  margin-bottom: 56px;
}

.steps-list {
  display: grid;
  gap: 20px;
}

.steps-list .step-item {
  display: flex;
  gap: 20px;
  padding: 24px;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-accent);
  color: #ffffff;
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}

.step-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.step-content p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

.device-platform-section {
  margin-bottom: 56px;
}

.device-platform-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}

.device-block,
.platform-block {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
}

.device-block h3,
.platform-block h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-accent);
}

.device-block li,
.platform-block li {
  font-size: 15px;
  color: var(--color-text-secondary);
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
  line-height: 1.6;
}

.device-block li:last-child,
.platform-block li:last-child {
  border-bottom: none;
}

.device-block strong,
.platform-block strong {
  color: var(--color-text);
  font-weight: 600;
}

.guide-media {
  margin: 0;
}

.guide-media img {
  width: 100%;
  height: 260px;
  object-fit: cover;
  border-radius: var(--radius);
}

.guide-media figcaption {
  font-size: 13px;
  color: var(--color-text-secondary);
  text-align: center;
  padding: 10px 0 0;
}

.habit-advice-section {
  margin-bottom: 56px;
}

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

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

.habit-card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--color-accent);
}

.habit-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin: 0;
}

/* rukou.html — 入口核验 */
.checklist-section {
  margin-bottom: 56px;
}

.checklist-list {
  display: grid;
  gap: 16px;
}

.checklist-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 24px;
}

.check-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}

.check-content h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}

.check-content p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin: 0;
}

.risk-section {
  margin-bottom: 56px;
}

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

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

.risk-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-warning-text);
}

.risk-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin: 0;
}

.related-section {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
}

/* faq.html — 常见问题 */
.faq-section {
  margin-bottom: 48px;
}

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

/* jiedu.html — 内容解读 */
.content-narrative {
  margin-bottom: 56px;
}

.content-narrative .section-title {
  margin-bottom: 24px;
}

.narrative-figure {
  margin: 0 0 24px;
}

.narrative-figure img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  border-radius: var(--radius);
}

.content-narrative p {
  font-size: 16px;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 20px;
}

.viewpoints {
  margin-bottom: 56px;
}

.viewpoints-intro {
  font-size: 15px;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
}

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

.viewpoint-card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
}

.viewpoint-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-accent);
}

.viewpoint-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
}

.viewpoints-note {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-top: 24px;
  padding: 16px 20px;
  background-color: var(--color-card);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.related-reading {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
}

/* 404 页面 */
.error-main {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  padding: 64px 24px;
}

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

.error-panel h1 {
  font-size: 72px;
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 16px;
}

.error-lead {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 12px;
}

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

.error-back {
  display: inline-block;
  padding: 12px 32px;
  background-color: var(--color-accent);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius);
  transition: background-color 0.2s ease;
}

.error-back:hover {
  background-color: var(--color-accent-dark);
  color: #ffffff;
}

/* ==========================================================================
   Responsive — 响应式断点 1024px / 768px / 390px
   ========================================================================== */

@media (max-width: 1024px) {
  :root {
    --section-space: 56px;
  }

  .hero-section {
    gap: 40px;
    padding: 56px 0 64px;
  }

  .hero-title {
    font-size: 34px;
  }

  .hero-media img {
    height: 360px;
  }

  .channel-cards,
  .topic-scroll,
  .special-grid,
  .habit-cards,
  .viewpoint-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .topic-scroll .topic-card:last-child,
  .special-grid .special-card:last-child,
  .habit-cards .habit-card:last-child,
  .viewpoint-grid .viewpoint-card:last-child {
    grid-column: span 2;
  }

  .topic-scroll .topic-card:last-child .card-img,
  .special-grid .special-card:last-child .special-media img {
    height: 220px;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
    --section-space: 48px;
  }

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

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--color-card);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 16px rgba(31, 41, 55, 0.08);
  }

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

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

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

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

  .page-header {
    padding: 24px 0 28px;
    margin-bottom: 36px;
  }

  .page-title {
    font-size: 28px;
  }

  .hero-section {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 40px 0 48px;
  }

  .hero-content {
    max-width: 100%;
  }

  .hero-title {
    font-size: 30px;
  }

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

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

  .hero-media img {
    height: 280px;
  }

  .channel-cards,
  .topic-scroll,
  .steps-row,
  .channel-grid,
  .special-grid,
  .habit-cards,
  .viewpoint-grid,
  .device-platform-grid,
  .risk-grid,
  .advice-list,
  .topic-advice-section .advice-list {
    grid-template-columns: 1fr;
  }

  .topic-scroll .topic-card:last-child,
  .special-grid .special-card:last-child,
  .habit-cards .habit-card:last-child,
  .viewpoint-grid .viewpoint-card:last-child {
    grid-column: span 1;
  }

  .topic-scroll .topic-card:last-child .card-img,
  .special-grid .special-card:last-child .special-media img {
    height: 180px;
  }

  .steps-list .step-item {
    flex-direction: column;
    gap: 12px;
  }

  .step-number {
    margin-top: 0;
  }

  .insight-promo {
    padding: 32px 24px;
  }

  .selection-advice,
  .related-section,
  .related-reading {
    padding: 24px 20px;
  }

  .footer-inner {
    padding: 40px 16px 24px;
  }

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

  .error-panel {
    padding: 40px 24px;
  }

  .error-panel h1 {
    font-size: 56px;
  }
}

@media (max-width: 390px) {
  .logo-text {
    font-size: 19px;
  }

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

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

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

  .section-head .section-title,
  .section-title {
    font-size: 21px;
  }

  .card-img {
    height: 160px;
  }

  .channel-figure img,
  .special-media img {
    height: 160px;
  }

  .guide-media img,
  .narrative-figure img {
    height: 200px;
  }

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

  .checklist-item {
    flex-direction: column;
    gap: 10px;
  }

  .check-icon {
    margin-top: 0;
  }

  .risk-card,
  .habit-card,
  .advice-item,
  .viewpoint-card {
    padding: 20px 16px;
  }

  .faq-item summary {
    padding: 16px 44px 16px 16px;
    font-size: 15px;
  }

  .faq-item p {
    padding: 14px 16px 18px;
    font-size: 14px;
  }

  .btn {
    padding: 12px 20px;
    font-size: 14px;
  }
}

/* ==========================================================================
   Accessibility — 可访问性辅助
   ========================================================================== */

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}