/* ==========================================================================
   一支红杏机场 (iyizhihongxing.sbs) - 纯白瓷器金缮绯红裂痕 视觉设计系统
   Porcelain Kintsugi & Liquid Scarlet Design System
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Noto+Sans+SC:wght@300;400;500;700;900&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
  /* 瓷器与绯红金缮核心色调 */
  --bg-porcelain: #F7F8FA;
  --bg-porcelain-card: #FCFCFD;
  --bg-porcelain-pure: #FFFFFF;
  --bg-porcelain-dark: #12141C;

  /* 绯红液态釉 Liquid Scarlet Enamel */
  --scarlet-primary: #E60033;
  --scarlet-hover: #FF1F4B;
  --scarlet-deep: #B30024;
  --scarlet-light: rgba(230, 0, 51, 0.08);
  --scarlet-glow: rgba(230, 0, 51, 0.28);
  --scarlet-gradient: linear-gradient(135deg, #FF1F4B 0%, #E60033 50%, #C70025 100%);
  --scarlet-gold-kintsugi: linear-gradient(110deg, #E60033 0%, #FF5277 45%, #D4AF37 70%, #E60033 100%);

  /* 冷玉瓷与墨色 Text & Border Colors */
  --text-main: #1C1F2B;
  --text-sub: #555E75;
  --text-muted: #8E97AD;
  --text-light: #F7F8FA;

  --border-porcelain: rgba(215, 222, 235, 0.7);
  --border-porcelain-hover: rgba(230, 0, 51, 0.4);
  --border-glow: rgba(230, 0, 51, 0.6);

  /* 阴影 & 瓷光 */
  --shadow-porcelain-sm: 0 4px 16px rgba(20, 25, 40, 0.03);
  --shadow-porcelain-md: 0 10px 30px rgba(15, 20, 35, 0.06);
  --shadow-porcelain-lg: 0 20px 45px rgba(230, 0, 51, 0.12);
  --shadow-scarlet-pulse: 0 0 25px rgba(230, 0, 51, 0.35);

  /* 字体与间距 */
  --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', 'Noto Sans SC', system-ui, -apple-system, sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* 全局重置与基础样式 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-family: var(--font-sans);
  font-size: 16px;
  scroll-behavior: smooth;
  color: var(--text-main);
  background-color: var(--bg-porcelain);
  -webkit-font-smoothing: antialiased;
}

body {
  line-height: 1.65;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(230, 0, 51, 0.03) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(230, 0, 51, 0.02) 0%, transparent 40%),
    url("data:image/svg+xml,%3Csvg width='120' height='120' viewBox='0 0 120 120' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M10 20L30 50L50 30L90 80L110 70M40 90L60 110L80 90' stroke='rgba(200,210,225,0.18)' stroke-width='0.8' fill='none' stroke-dasharray='3 2'/%3E%3C/svg%3E");
}

/* 链接样式 */
a {
  color: var(--scarlet-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* 统一布局容器 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Header & Navigation (瓷色浮动导航栏)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(252, 252, 253, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(220, 225, 235, 0.8);
  transition: all var(--transition-fast);
}

.site-header.scrolled {
  box-shadow: 0 8px 30px rgba(10, 15, 30, 0.05);
  background: rgba(255, 255, 255, 0.95);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

/* Logo 品牌标识 */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.45rem;
  color: var(--text-main);
  position: relative;
}

.brand-logo-icon {
  width: 40px;
  height: 40px;
  background: var(--scarlet-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  font-size: 1.25rem;
  box-shadow: var(--shadow-porcelain-sm), var(--shadow-scarlet-pulse);
  position: relative;
  overflow: hidden;
}

.brand-logo-icon::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent 45%, rgba(255, 255, 255, 0.6) 50%, transparent 55%);
  animation: kintsugiShine 4s infinite linear;
}

@keyframes kintsugiShine {
  0% { transform: translateX(-100%) rotate(45deg); }
  30%, 100% { transform: translateX(100%) rotate(45deg); }
}

.brand-text {
  letter-spacing: -0.02em;
}

.brand-badge {
  font-size: 0.68rem;
  background: var(--scarlet-light);
  color: var(--scarlet-primary);
  border: 1px solid rgba(230, 0, 51, 0.2);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* 导航链接 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-sub);
  position: relative;
  padding: 8px 0;
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--scarlet-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--scarlet-gradient);
  border-radius: 2px;
  transition: all var(--transition-fast);
  transform: translateX(-50%);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

/* 导航按钮 CTA */
.nav-cta-group {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 24px;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
  cursor: pointer;
  border: none;
  outline: none;
}

.btn-scarlet {
  background: var(--scarlet-gradient);
  color: #FFFFFF !important;
  box-shadow: 0 6px 20px rgba(230, 0, 51, 0.3);
  position: relative;
  overflow: hidden;
}

.btn-scarlet::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.6s ease;
}

.btn-scarlet:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 10px 28px rgba(230, 0, 51, 0.45);
}

.btn-scarlet:hover::before {
  left: 100%;
}

.btn-porcelain {
  background: var(--bg-porcelain-card);
  color: var(--text-main);
  border: 1px solid var(--border-porcelain);
  box-shadow: var(--shadow-porcelain-sm);
}

.btn-porcelain:hover {
  border-color: var(--scarlet-primary);
  color: var(--scarlet-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-porcelain-md);
}

/* 移动端菜单切换按钮 */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-main);
  cursor: pointer;
}

/* ==========================================================================
   Hero Section (首屏介绍 + 冰裂红釉金缮视觉)
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 80px 0 100px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--bg-porcelain-pure);
  border: 1px solid rgba(230, 0, 51, 0.25);
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--scarlet-primary);
  margin-bottom: 24px;
  box-shadow: var(--shadow-porcelain-sm);
}

.hero-tag-dot {
  width: 8px;
  height: 8px;
  background: var(--scarlet-primary);
  border-radius: 50%;
  animation: pulseDot 1.8s infinite ease-in-out;
}

@keyframes pulseDot {
  0%, 100% { transform: scale(0.8); opacity: 0.7; }
  50% { transform: scale(1.3); opacity: 1; box-shadow: 0 0 10px var(--scarlet-primary); }
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1.2;
  color: var(--text-main);
  margin-bottom: 24px;
  letter-spacing: -0.03em;
}

.hero-title-highlight {
  background: var(--scarlet-gold-kintsugi);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
  display: inline-block;
}

.hero-desc {
  font-size: 1.18rem;
  color: var(--text-sub);
  margin-bottom: 36px;
  line-height: 1.8;
  max-width: 620px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.btn-lg {
  padding: 14px 36px;
  font-size: 1.05rem;
}

/* 信任指标 & 优势速览 */
.hero-trust-list {
  display: flex;
  align-items: center;
  gap: 32px;
  padding-top: 28px;
  border-top: 1px solid rgba(215, 222, 235, 0.6);
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 10px;
}

.trust-icon {
  color: var(--scarlet-primary);
  font-size: 1.2rem;
}

.trust-text {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-sub);
}

/* 首屏卡片与冰裂金缮视效 */
.hero-visual-card {
  position: relative;
  background: var(--bg-porcelain-card);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-porcelain-lg);
  overflow: hidden;
  transition: transform var(--transition-normal);
}

.hero-visual-card:hover {
  transform: translateY(-4px);
  border-color: var(--scarlet-primary);
}

.hero-img-wrapper {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.hero-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s ease;
}

.hero-visual-card:hover img {
  transform: scale(1.03);
}

/* 浮动测速浮窗 Badge */
.hero-floating-badge {
  position: absolute;
  bottom: 30px;
  left: 30px;
  right: 30px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(230, 0, 51, 0.25);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-porcelain-md);
}

.speed-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.speed-pulse-icon {
  width: 36px;
  height: 36px;
  background: var(--scarlet-light);
  color: var(--scarlet-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.speed-title {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.speed-value {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--scarlet-primary);
  font-family: var(--font-heading);
}

/* ==========================================================================
   Section Title (通用的金缮风格标题)
   ========================================================================== */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px;
  position: relative;
}

.section-subtitle {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--scarlet-primary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
  padding: 4px 14px;
  background: var(--scarlet-light);
  border-radius: var(--radius-full);
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-sub);
  line-height: 1.7;
}

/* ==========================================================================
   Core Advantages Grid (核心优势 - 瓷质冰裂缝隙卡片)
   ========================================================================== */
.advantages-section {
  padding: 80px 0;
}

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

.porcelain-card {
  position: relative;
  background: var(--bg-porcelain-card);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  box-shadow: var(--shadow-porcelain-sm);
  transition: all var(--transition-normal);
  overflow: hidden;
}

.porcelain-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--scarlet-gradient);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.porcelain-card:hover {
  transform: translateY(-6px);
  border-color: rgba(230, 0, 51, 0.35);
  box-shadow: var(--shadow-porcelain-lg);
}

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

.card-icon-box {
  width: 58px;
  height: 58px;
  background: rgba(252, 252, 253, 1);
  border: 1px solid rgba(230, 0, 51, 0.2);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--scarlet-primary);
  font-size: 1.6rem;
  margin-bottom: 24px;
  box-shadow: var(--shadow-porcelain-sm);
  transition: all var(--transition-normal);
}

.porcelain-card:hover .card-icon-box {
  background: var(--scarlet-gradient);
  color: #FFFFFF;
  transform: scale(1.08) rotate(-4deg);
  box-shadow: var(--shadow-scarlet-pulse);
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.card-text {
  font-size: 0.96rem;
  color: var(--text-sub);
  line-height: 1.7;
}

/* ==========================================================================
   Pricing Plans Section (套餐价格 - 白瓷高亮卡片)
   ========================================================================== */
.pricing-section {
  padding: 90px 0;
  background: linear-gradient(180deg, var(--bg-porcelain) 0%, #F0F3F8 100%);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  align-items: stretch;
}

.price-card {
  position: relative;
  background: var(--bg-porcelain-card);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-porcelain-sm);
  transition: all var(--transition-normal);
}

.price-card.featured {
  border: 2px solid var(--scarlet-primary);
  background: #FFFFFF;
  box-shadow: var(--shadow-porcelain-lg);
  transform: scale(1.03);
}

.popular-badge {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--scarlet-gradient);
  color: #FFF;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px rgba(230, 0, 51, 0.3);
}

.price-header {
  text-align: center;
  padding-bottom: 28px;
  border-bottom: 1px solid rgba(220, 225, 235, 0.7);
  margin-bottom: 28px;
}

.price-name {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.price-amount {
  font-family: var(--font-heading);
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--scarlet-primary);
  line-height: 1;
}

.price-amount span {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 500;
}

.price-features {
  list-style: none;
  margin-bottom: 32px;
  flex-grow: 1;
}

.price-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-sub);
  margin-bottom: 16px;
}

.price-features i {
  color: var(--scarlet-primary);
  font-size: 1.1rem;
}

/* ==========================================================================
   Target Audience Section (适合人群)
   ========================================================================== */
.audience-section {
  padding: 90px 0;
}

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

.audience-card {
  background: var(--bg-porcelain-card);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition-fast);
}

.audience-card:hover {
  border-color: var(--scarlet-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-porcelain-md);
}

.audience-icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 16px;
  background: var(--scarlet-light);
  color: var(--scarlet-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.audience-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 8px;
}

.audience-desc {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.6;
}

/* ==========================================================================
   Tutorial Preview Section (Clash / Clash Party 教程指南)
   ========================================================================== */
.tutorials-section {
  padding: 90px 0;
  background: #FFFFFF;
  border-top: 1px solid var(--border-porcelain);
  border-bottom: 1px solid var(--border-porcelain);
}

.tutorial-tabs {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 24px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-porcelain);
  background: var(--bg-porcelain-card);
  color: var(--text-sub);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-btn.active, .tab-btn:hover {
  background: var(--scarlet-primary);
  color: #FFFFFF;
  border-color: var(--scarlet-primary);
  box-shadow: 0 4px 16px rgba(230, 0, 51, 0.25);
}

.tutorial-content-box {
  background: var(--bg-porcelain-card);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-porcelain-md);
}

.steps-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
}

.step-item {
  position: relative;
  background: var(--bg-porcelain-pure);
  border: 1px solid rgba(220, 225, 235, 0.8);
  border-radius: var(--radius-md);
  padding: 28px 20px;
}

.step-number {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 900;
  color: rgba(230, 0, 51, 0.25);
  position: absolute;
  top: 12px;
  right: 16px;
  line-height: 1;
}

.step-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.step-desc {
  font-size: 0.88rem;
  color: var(--text-sub);
  line-height: 1.6;
}

/* ==========================================================================
   Testimonials / Reviews (用户评价)
   ========================================================================== */
.reviews-section {
  padding: 90px 0;
}

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

.review-card {
  background: var(--bg-porcelain-card);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  box-shadow: var(--shadow-porcelain-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-rating {
  color: #FFB800;
  margin-bottom: 16px;
  font-size: 1rem;
}

.review-text {
  font-size: 0.98rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 24px;
  font-style: italic;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--scarlet-gradient);
  color: #FFF;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}

.author-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.author-role {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   FAQ Accordion Section (常见问题)
   ========================================================================== */
.faq-section {
  padding: 90px 0;
  background: var(--bg-porcelain-card);
}

.faq-list {
  max-width: 860px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-porcelain-pure);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.faq-item.active {
  border-color: var(--scarlet-primary);
  box-shadow: var(--shadow-porcelain-md);
}

.faq-question {
  padding: 22px 28px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.faq-question i {
  color: var(--scarlet-primary);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 28px 24px;
  font-size: 0.98rem;
  color: var(--text-sub);
  line-height: 1.8;
  display: none;
}

.faq-item.active .faq-answer {
  display: block;
}

/* ==========================================================================
   Article Catalog Hub (文章站目录)
   ========================================================================== */
.articles-section {
  padding: 90px 0;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.article-card {
  background: var(--bg-porcelain-card);
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-porcelain-sm);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--scarlet-primary);
  box-shadow: var(--shadow-porcelain-lg);
}

.article-thumb {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--bg-porcelain);
  overflow: hidden;
}

.article-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.article-card:hover .article-thumb img {
  transform: scale(1.05);
}

.article-tag {
  position: absolute;
  top: 14px;
  left: 14px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--scarlet-primary);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(230, 0, 51, 0.2);
}

.article-content {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.article-title {
  font-family: var(--font-heading);
  font-size: 1.18rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 12px;
}

.article-title a {
  color: inherit;
}

.article-title a:hover {
  color: var(--scarlet-primary);
}

.article-summary {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-muted);
  padding-top: 16px;
  border-top: 1px solid rgba(230, 235, 245, 0.8);
}

/* ==========================================================================
   Article Detail Page Layout (文章详情页结构)
   ========================================================================== */
.article-detail-header {
  padding: 60px 0 40px;
  background: linear-gradient(180deg, var(--bg-porcelain-card) 0%, var(--bg-porcelain) 100%);
  border-bottom: 1px solid var(--border-porcelain);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

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

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

.article-header-title {
  font-family: var(--font-heading);
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 20px;
}

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 48px;
  padding: 60px 0;
}

.article-main {
  background: #FFFFFF;
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-porcelain-sm);
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text-main);
}

.article-body h2 {
  font-family: var(--font-heading);
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text-main);
  margin: 40px 0 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--scarlet-light);
  position: relative;
}

.article-body h2::before {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 2px;
  background: var(--scarlet-primary);
}

.article-body h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 30px 0 16px;
}

.article-body p {
  margin-bottom: 24px;
  color: #333A4C;
}

.article-body ul, .article-body ol {
  margin-bottom: 24px;
  padding-left: 24px;
}

.article-body li {
  margin-bottom: 10px;
  color: #333A4C;
}

.article-body blockquote {
  background: var(--bg-porcelain);
  border-left: 4px solid var(--scarlet-primary);
  padding: 20px 24px;
  margin: 30px 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--text-sub);
}

/* 文章内部 Call-to-action 提示框 */
.article-cta-box {
  background: linear-gradient(135deg, rgba(230, 0, 51, 0.04) 0%, rgba(255, 255, 255, 0.9) 100%);
  border: 1.5px solid var(--scarlet-primary);
  border-radius: var(--radius-md);
  padding: 32px;
  margin: 40px 0;
  text-align: center;
}

.article-cta-box h4 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 10px;
}

.article-cta-box p {
  font-size: 0.96rem;
  color: var(--text-sub);
  margin-bottom: 20px;
}

/* Sidebar 文章侧边栏 */
.article-sidebar {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.sidebar-widget {
  background: #FFFFFF;
  border: 1px solid var(--border-porcelain);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-porcelain-sm);
}

.widget-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(220, 225, 235, 0.8);
}

.toc-list {
  list-style: none;
}

.toc-list li {
  margin-bottom: 12px;
}

.toc-list a {
  font-size: 0.92rem;
  color: var(--text-sub);
  display: block;
}

.toc-list a:hover {
  color: var(--scarlet-primary);
  padding-left: 4px;
}

/* ==========================================================================
   Footer Section (页脚与网站地图)
   ========================================================================== */
.site-footer {
  background: var(--bg-porcelain-dark);
  color: #A0AEC0;
  padding: 80px 0 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 60px;
}

.footer-brand .brand-logo {
  color: #FFFFFF;
  margin-bottom: 20px;
}

.footer-desc {
  font-size: 0.92rem;
  line-height: 1.7;
  color: #8E9BBA;
  margin-bottom: 24px;
}

.footer-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 24px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: #8E9BBA;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: #6C7A9C;
}

.footer-legal-links {
  display: flex;
  gap: 24px;
}

.footer-legal-links a {
  color: #6C7A9C;
}

.footer-legal-links a:hover {
  color: #FFFFFF;
}

/* ==========================================================================
   Responsive Media Queries (移动端适配)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-actions {
    justify-content: center;
  }
  .hero-trust-list {
    justify-content: center;
  }
  .advantages-grid, .pricing-grid, .reviews-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .steps-list, .audience-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .article-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links, .nav-cta-group {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .hero-title {
    font-size: 2.3rem;
  }
  .advantages-grid, .pricing-grid, .reviews-grid, .articles-grid, .steps-list, .audience-grid {
    grid-template-columns: 1fr;
  }
  .price-card.featured {
    transform: none;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
  .article-main {
    padding: 24px;
  }
}