/* ==========================================================================
   快柠檬 Falemon - 现代极速清新浅色样式表 (Ultra-Light Modern Clean Theme)
   纯原生 CSS，零重型框架，秒开级加载体验
   ========================================================================== */

:root {
  /* 浅色基调与背景系统 */
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-section-alt: #f1f5f9;
  --border-color: #e2e8f0;
  --border-card-hover: #fcd34d;
  
  /* 柠檬黄品牌配色与高辨识度强调色 */
  --lemon-primary: #f59e0b;
  --lemon-hover: #d97706;
  --lemon-dark: #b45309;
  --lemon-light-bg: #fffbeb;
  --lemon-border: #fde68a;
  --lemon-gradient: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
  --lemon-glow: rgba(245, 158, 11, 0.25);
  
  /* 深度文字排版系统（高可读性、高对比度） */
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;
  
  --success: #10b981;
  --danger: #ef4444;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  
  --container-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
  --shadow-hover: 0 16px 32px -4px rgba(245, 158, 11, 0.15), 0 4px 12px -2px rgba(15, 23, 42, 0.04);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-main);
  color: var(--text-main);
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  background-color: var(--bg-main);
  background-image: 
    radial-gradient(circle at 10% 8%, rgba(245, 158, 11, 0.07) 0%, transparent 45%),
    radial-gradient(circle at 90% 70%, rgba(251, 191, 36, 0.06) 0%, transparent 50%);
  background-attachment: fixed;
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

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

img, svg {
  display: block;
  max-width: 100%;
}

ul {
  list-style: none;
}

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

/* 按钮规范与呼吁动作 (CTA) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1rem;
  padding: 14px 28px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  border: 1px solid transparent;
  min-height: 48px;
  touch-action: manipulation;
}

.btn-primary {
  background: var(--lemon-gradient);
  color: #1e293b;
  box-shadow: 0 4px 16px var(--lemon-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.35);
  filter: brightness(1.04);
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-main);
  border-color: var(--border-color);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.btn-secondary:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.06);
}

.btn-block {
  width: 100%;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.125rem;
}

/* 顶部导航栏 (清爽半透明磨砂) */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
}

.navbar .nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.brand-logo .lemon-icon {
  font-size: 1.7rem;
  filter: drop-shadow(0 2px 4px rgba(245, 158, 11, 0.3));
}

.brand-logo span.highlight {
  color: var(--lemon-dark);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links a {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 600;
}

.nav-links a:hover {
  color: var(--lemon-dark);
}

/* 页面通用标题与副标 */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px auto;
}

.section-tag {
  display: inline-block;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  background: var(--lemon-light-bg);
  color: var(--lemon-dark);
  font-size: 0.825rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 14px;
  border: 1px solid var(--lemon-border);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* 主视觉区 (Hero Section) */
.hero-section {
  padding: 85px 0 65px 0;
  text-align: center;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: var(--radius-full);
  background: var(--lemon-light-bg);
  border: 1px solid var(--lemon-border);
  color: var(--lemon-dark);
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 24px;
  box-shadow: 0 2px 6px rgba(245, 158, 11, 0.08);
}

.hero-title {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
  color: var(--text-main);
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #d97706 0%, #b45309 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 820px;
  margin: 0 auto 36px auto;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-guarantee {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
}

.hero-guarantee span {
  display: flex;
  align-items: center;
  gap: 6px;
}

.hero-guarantee span::before {
  content: "✔";
  color: var(--success);
  font-weight: bold;
}

/* 主视觉美图展示容器 (Hero Visual Card) */
.hero-visual-wrapper {
  margin: 40px auto 24px auto;
  max-width: 760px;
  position: relative;
}

.hero-visual-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  box-shadow: 0 20px 45px -10px rgba(245, 158, 11, 0.22), 0 8px 16px -2px rgba(15, 23, 42, 0.05);
  transition: var(--transition);
}

.hero-visual-card:hover {
  transform: translateY(-4px);
  border-color: #fcd34d;
  box-shadow: 0 26px 52px -8px rgba(245, 158, 11, 0.3), 0 12px 22px -2px rgba(15, 23, 42, 0.06);
}

.hero-visual-img {
  width: 100%;
  height: auto;
  max-height: 460px;
  object-fit: cover;
  display: block;
}

.hero-visual-badge {
  position: absolute;
  bottom: 18px;
  right: 18px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border: 1px solid var(--lemon-border);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
}

.hero-visual-badge .badge-icon {
  font-size: 1.1rem;
}

/* 平台支持标签栏 */
.platform-bar {
  margin-top: 50px;
  padding: 20px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.5);
}

.platform-list {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 32px;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
}

.platform-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 核心优势板块 */
.features-section {
  padding: 90px 0;
  background: var(--bg-section-alt);
}

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

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  transition: var(--transition);
  position: relative;
  box-shadow: var(--shadow-card);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-card-hover);
  box-shadow: var(--shadow-hover);
}

.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: var(--lemon-light-bg);
  border: 1px solid var(--lemon-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* 流媒体与 AI 支持专区 */
.media-ai-section {
  padding: 90px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.showcase-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px;
  position: relative;
  box-shadow: var(--shadow-card);
}

.showcase-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.showcase-header .icon {
  font-size: 2rem;
}

.showcase-box h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
}

.showcase-box p.desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.6;
}

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

.app-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
}

.app-pill.highlighted {
  border-color: #fcd34d;
  background: #fffbeb;
  color: var(--lemon-dark);
}

.app-pill .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
}

/* 价格对比表板块 */
.pricing-section {
  padding: 90px 0;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
  box-shadow: var(--shadow-card);
}

.pricing-card:hover {
  transform: translateY(-6px);
  border-color: #fcd34d;
  box-shadow: var(--shadow-hover);
}

.pricing-card.popular {
  border-color: var(--lemon-primary);
  background: linear-gradient(180deg, #fffbeb 0%, #ffffff 40%);
  box-shadow: 0 12px 35px var(--lemon-glow);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--lemon-gradient);
  color: #1e293b;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  text-transform: uppercase;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.plan-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-main);
}

.plan-desc {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.plan-price {
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.plan-price .currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--lemon-dark);
}

.plan-price .amount {
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
  color: var(--text-main);
  letter-spacing: -1px;
}

.plan-price .period {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.plan-price .discount-tip {
  display: inline-block;
  margin-top: 8px;
  font-size: 0.775rem;
  color: var(--lemon-dark);
  background: var(--lemon-light-bg);
  border: 1px solid var(--lemon-border);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-weight: 700;
}

.plan-features {
  flex-grow: 1;
  margin-bottom: 32px;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.925rem;
  margin-bottom: 14px;
  color: var(--text-main);
}

.plan-features li .check-icon {
  color: var(--success);
  font-weight: bold;
  font-size: 1.1rem;
  flex-shrink: 0;
}

/* 用户评价板块 */
.reviews-section {
  padding: 90px 0;
  background: var(--bg-section-alt);
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-card);
}

.review-stars {
  color: #f59e0b;
  margin-bottom: 16px;
  font-size: 1.1rem;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: normal;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--lemon-light-bg);
  border: 1px solid var(--lemon-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: var(--lemon-dark);
  font-size: 1.1rem;
}

.user-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.user-info p {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* FAQ 常见问题板块 */
.faq-section {
  padding: 90px 0;
}

.faq-list {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  transition: var(--transition);
  box-shadow: var(--shadow-card);
}

.faq-item:hover {
  border-color: #fcd34d;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.04);
}

.faq-question {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.faq-question::before {
  content: "问";
  color: var(--lemon-dark);
  font-weight: 900;
  font-size: 1.15rem;
}

.faq-answer {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  padding-left: 28px;
}

/* 底部 CTA 转化条 */
.bottom-cta {
  padding: 70px 0;
  background: linear-gradient(180deg, transparent 0%, rgba(245, 158, 11, 0.05) 100%);
  text-align: center;
}

.bottom-cta-box {
  background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 40%, #ffffff 100%);
  border: 1px solid var(--lemon-border);
  border-radius: var(--radius-lg);
  padding: 60px 30px;
  max-width: 900px;
  margin: 0 auto;
  box-shadow: 0 16px 40px rgba(245, 158, 11, 0.12);
}

.bottom-cta-box h2 {
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 16px;
  color: var(--text-main);
}

.bottom-cta-box p {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 32px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* 页脚规范 (严格只保留四个标题，新页面打开) */
.footer {
  border-top: 1px solid var(--border-color);
  background: #ffffff;
  padding: 40px 0;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 40px;
  margin-bottom: 24px;
}

.footer-nav a {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  padding-bottom: 4px;
}

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

.footer-nav a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--lemon-primary);
  transition: width 0.25s ease;
}

.footer-nav a:hover::after {
  width: 100%;
}

.footer-copy {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* ==========================================================================
   单独展示页面的通用浅色排版 (关于我们、服务条款、隐私政策、网站地图)
   ========================================================================== */
.subpage-wrapper {
  padding: 60px 0 90px 0;
  max-width: 860px;
  margin: 0 auto;
}

.subpage-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--lemon-dark);
  font-weight: 700;
  margin-bottom: 30px;
  font-size: 0.95rem;
}

.subpage-back:hover {
  transform: translateX(-4px);
}

.subpage-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-card);
}

.subpage-card h1 {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 12px;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.subpage-card .subpage-date {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.subpage-content h2 {
  font-size: 1.45rem;
  font-weight: 700;
  margin: 32px 0 14px 0;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.subpage-content h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 20px;
  background: var(--lemon-primary);
  border-radius: 2px;
}

.subpage-content p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.subpage-content ul {
  margin: 12px 0 24px 20px;
  list-style-type: disc;
}

.subpage-content ul li {
  color: var(--text-muted);
  font-size: 0.975rem;
  line-height: 1.75;
  margin-bottom: 8px;
}

.subpage-content ul li strong {
  color: var(--text-main);
}

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

.sitemap-group {
  background: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
}

.sitemap-group h3 {
  font-size: 1.15rem;
  margin-bottom: 14px;
  color: var(--lemon-dark);
}

.sitemap-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sitemap-group ul li {
  margin-bottom: 10px;
}

.sitemap-group ul li a {
  color: var(--text-muted);
  display: block;
  padding: 6px 0;
  font-weight: 500;
}

.sitemap-group ul li a:hover {
  color: var(--lemon-dark);
  padding-left: 6px;
}

/* ==========================================================================
   高科技网格卡片 (Tech Grid Cards) & 文章内容专有样式
   ========================================================================== */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
}

.tech-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  position: relative;
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.tech-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--lemon-gradient);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.tech-card:hover {
  transform: translateY(-5px);
  border-color: #fcd34d;
  box-shadow: var(--shadow-hover);
}

.tech-card:hover::before {
  opacity: 1;
}

.tech-card-header {
  margin-bottom: 14px;
}

.tech-card-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--lemon-light-bg);
  color: var(--lemon-dark);
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 10px;
  border: 1px solid var(--lemon-border);
}

.tech-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text-main);
  margin-bottom: 10px;
}

.tech-card-title a {
  color: var(--text-main);
}

.tech-card-title a:hover {
  color: var(--lemon-dark);
}

.tech-card-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.tech-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.tech-card-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--lemon-dark);
  font-weight: 700;
  font-size: 0.875rem;
}

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

/* SEO 文章正文排版优化 */
.article-header {
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 12px;
  flex-wrap: wrap;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.85;
  color: #334155;
}

.article-body h2 {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 36px 0 16px 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-body h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 20px;
  background: var(--lemon-primary);
  border-radius: 2px;
}

.article-body h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 24px 0 12px 0;
}

.article-body p {
  margin-bottom: 18px;
  text-align: justify;
}

.article-body ul, .article-body ol {
  margin: 12px 0 20px 24px;
}

.article-body li {
  margin-bottom: 8px;
  line-height: 1.75;
}

.article-body a {
  color: var(--lemon-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 600;
}

.article-body a:hover {
  color: var(--lemon-primary);
}

.article-tip-box {
  background: var(--lemon-light-bg);
  border-left: 4px solid var(--lemon-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 0.95rem;
  color: #78350f;
}

.article-footer-nav {
  margin-top: 50px;
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

/* ==========================================================================
   移动端与响应式适配媒体查询 (@media)
   确保手机端完美单栏展示，按钮适合手指点击 (Touch-Friendly)
   ========================================================================== */
@media (max-width: 992px) {
  .features-grid,
  .pricing-grid,
  .reviews-grid,
  .tech-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .hero-title {
    font-size: 2.75rem;
  }
}

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

  .navbar {
    padding: 12px 0;
  }

  .nav-links {
    display: none; /* 移动端精简头部，直奔主题 */
  }

  .hero-section {
    padding: 50px 0 40px 0;
  }

  .hero-title {
    font-size: 2.15rem;
    line-height: 1.25;
    letter-spacing: -0.5px;
  }

  .hero-subtitle {
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 28px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }

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

  .hero-guarantee {
    flex-direction: column;
    gap: 8px;
  }

  .hero-visual-wrapper {
    margin: 24px auto 16px auto;
  }

  .hero-visual-badge {
    bottom: 12px;
    right: 12px;
    padding: 6px 12px;
    font-size: 0.78rem;
  }

  /* 核心优势、流媒体、套餐价格单栏化 */
  .features-grid,
  .split-grid,
  .pricing-grid,
  .reviews-grid,
  .sitemap-grid,
  .tech-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .section-title {
    font-size: 1.75rem;
  }

  .section-subtitle {
    font-size: 0.95rem;
  }

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

  .pricing-card {
    padding: 28px 20px;
  }

  .showcase-box {
    padding: 24px 20px;
  }

  .faq-item {
    padding: 20px 18px;
  }

  .faq-question {
    font-size: 1rem;
  }

  .faq-answer {
    padding-left: 24px;
    font-size: 0.9rem;
  }

  .bottom-cta-box {
    padding: 40px 20px;
  }

  .bottom-cta-box h2 {
    font-size: 1.65rem;
  }

  .footer-nav {
    flex-direction: column;
    gap: 18px;
  }

  .subpage-card {
    padding: 28px 18px;
  }

  .subpage-card h1 {
    font-size: 1.85rem;
  }
}