/* ==========================================================================
   山水云机场 - 全景中国水墨画通栏布局与动态点缀特效
   ========================================================================== */

/* 1. 全局变量与 Token */
:root {
  --bg-dark: #070a0e;
  --bg-card: rgba(14, 19, 28, 0.82);
  --bg-card-hover: rgba(24, 32, 46, 0.92);
  --bg-glass: rgba(10, 14, 22, 0.82);
  
  --ink-primary: #0d1118;
  --ink-secondary: #151b24;
  --ink-light: #f0f4f8;
  --ink-muted: #9aa8b6;
  
  --accent-gold: #d4af37;
  --accent-gold-light: #f7ebbe;
  --accent-cyan: #2b8a76;
  --accent-emerald: #10b981;
  --accent-red: #c0392b;
  
  --border-ink: rgba(212, 175, 55, 0.25);
  --border-light: rgba(255, 255, 255, 0.1);
  --border-hover: rgba(212, 175, 55, 0.55);

  --font-family: 'STKaiti', 'KaiTi', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --shadow-ink: 0 20px 50px rgba(0, 0, 0, 0.65), 0 0 35px rgba(212, 175, 55, 0.08);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;
  --transition-fast: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 2. 重置与全屏水墨画背景 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  overflow-x: hidden;
}

body {
  background-color: var(--bg-dark);
  color: var(--ink-light);
  font-family: var(--font-family);
  line-height: 1.75;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* 铺满全屏的全景中国水墨画固定背景 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: 
    linear-gradient(180deg, rgba(7, 10, 14, 0.68) 0%, rgba(10, 14, 20, 0.82) 40%, rgba(7, 10, 14, 0.92) 100%),
    url('../images/bg.png') center top / cover no-repeat fixed;
  pointer-events: none;
  z-index: -3;
}

/* 动态背景画布 */
#inkCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
}

/* 3. 通栏全屏 Stacked Blocks 布局 */
.full-width-section {
  width: 100%;
  position: relative;
  padding: 105px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.full-width-section::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 85%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.3), transparent);
}

.section-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* 4. 水墨风 Header Title */
.section-header {
  text-align: center;
  margin-bottom: 64px;
  position: relative;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 22px;
  border-radius: 30px;
  background: rgba(212, 175, 55, 0.1);
  border: 1px solid rgba(212, 175, 55, 0.35);
  color: var(--accent-gold-light);
  font-size: 0.9rem;
  letter-spacing: 3px;
  margin-bottom: 16px;
  backdrop-filter: blur(8px);
}

.section-title {
  font-size: 2.7rem;
  font-weight: 700;
  color: var(--ink-light);
  letter-spacing: 2px;
  margin-bottom: 16px;
  position: relative;
  display: inline-block;
  font-family: 'STKaiti', 'KaiTi', serif;
  text-shadow: 0 4px 15px rgba(0,0,0,0.6);
}

.section-title::after {
  content: "";
  display: block;
  width: 80px;
  height: 3px;
  margin: 12px auto 0 auto;
  background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
  border-radius: 2px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--ink-muted);
  max-width: 720px;
  margin: 0 auto;
  text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

/* 5. 顶部固定水墨玻璃导航栏 */
.header-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  transition: var(--transition-fast);
}

.nav-container {
  max-width: 1380px;
  margin: 0 auto;
  padding: 0 28px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--ink-light);
}

.logo-stamp {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, #c0392b 0%, #8e2317 100%);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.45rem;
  font-weight: 900;
  color: #fff;
  font-family: 'STKaiti', 'KaiTi', serif;
  box-shadow: 0 0 20px rgba(192, 57, 43, 0.5);
  border: 1px solid rgba(255, 200, 200, 0.4);
}

.logo-text {
  font-size: 1.55rem;
  font-weight: 800;
  letter-spacing: 2px;
  font-family: 'STKaiti', 'KaiTi', sans-serif;
  background: linear-gradient(180deg, #ffffff 0%, var(--accent-gold-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  color: var(--ink-muted);
  text-decoration: none;
  font-size: 1.02rem;
  font-weight: 500;
  transition: var(--transition-fast);
  position: relative;
  padding: 6px 0;
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-gold-light);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--accent-gold);
  transition: var(--transition-fast);
}

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

.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 32px;
  border-radius: 30px;
  background: linear-gradient(135deg, #d4af37 0%, #b8860b 100%);
  color: #070a0e;
  font-weight: 700;
  font-size: 1rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 25px rgba(212, 175, 55, 0.4);
  transition: var(--transition-fast);
  letter-spacing: 1px;
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 35px rgba(212, 175, 55, 0.6);
  filter: brightness(1.1);
}

.cta-button-secondary {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-ink);
  color: var(--ink-light);
  box-shadow: none;
  backdrop-filter: blur(10px);
}

.cta-button-secondary:hover {
  background: rgba(212, 175, 55, 0.15);
  border-color: var(--accent-gold);
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.mobile-toggle span {
  width: 26px;
  height: 2px;
  background: var(--ink-light);
  transition: var(--transition-fast);
}

/* 6. Hero Section */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 140px;
  padding-bottom: 100px;
  position: relative;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 1000px;
  margin: 0 auto;
}

.hero-banner-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 26px;
  border-radius: 40px;
  background: rgba(27, 73, 49, 0.45);
  border: 1px solid rgba(16, 185, 129, 0.5);
  color: #6ee7b7;
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 28px;
  backdrop-filter: blur(10px);
}

.hero-banner-tag span.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 12px var(--accent-emerald);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
  font-size: 4rem;
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: 3px;
  margin-bottom: 28px;
  font-family: 'STKaiti', 'KaiTi', serif;
  background: linear-gradient(180deg, #ffffff 30%, #e2e8f0 70%, var(--accent-gold-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 6px 20px rgba(0, 0, 0, 0.7));
}

.hero-description {
  font-size: 1.25rem;
  color: var(--ink-muted);
  margin-bottom: 48px;
  line-height: 1.85;
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
  text-shadow: 0 2px 10px rgba(0,0,0,0.6);
}

.hero-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  margin-bottom: 64px;
  flex-wrap: wrap;
}

.hero-features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  margin-top: 40px;
}

.hero-feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 28px 20px;
  backdrop-filter: blur(14px);
  transition: var(--transition-fast);
  text-align: center;
}

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

.hero-feature-icon {
  font-size: 2.4rem;
  margin-bottom: 12px;
  display: block;
}

.hero-feature-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--ink-light);
  margin-bottom: 6px;
  font-family: 'STKaiti', 'KaiTi', serif;
}

.hero-feature-desc {
  font-size: 0.88rem;
  color: var(--ink-muted);
}

/* 7. Block 2: 节点延迟与状态 */
.node-section {
  background: rgba(7, 10, 14, 0.45);
}

.node-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 26px;
}

.node-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 26px;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(14px);
  transition: var(--transition-fast);
}

.node-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--accent-cyan);
}

.node-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-ink);
}

.node-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.node-info {
  display: flex;
  align-items: center;
  gap: 14px;
}

.flag-icon {
  font-size: 1.9rem;
  line-height: 1;
}

.node-name {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--ink-light);
}

.node-type {
  font-size: 0.8rem;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(212, 175, 55, 0.14);
  color: var(--accent-gold-light);
  margin-top: 2px;
  display: inline-block;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 20px;
  background: rgba(16, 185, 129, 0.18);
  color: #34d399;
}

.status-badge.online .dot-led {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
}

.node-body {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
  background: rgba(7, 10, 14, 0.7);
  padding: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.04);
}

.stat-item {
  text-align: center;
}

.stat-label {
  font-size: 0.76rem;
  color: var(--ink-muted);
  margin-bottom: 4px;
}

.stat-value {
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink-light);
}

.stat-value.ping-val {
  color: var(--accent-emerald);
}

.ping-refresh-wrapper {
  margin-top: 42px;
  text-align: center;
}

/* 8. Block 3: 核心优势与套餐价格 */
.advantages-section {
  background: rgba(7, 10, 14, 0.55);
}

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

.adv-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  position: relative;
  backdrop-filter: blur(14px);
  transition: var(--transition-fast);
}

.adv-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-6px);
  box-shadow: var(--shadow-ink);
}

.adv-icon-wrap {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.18), rgba(43, 138, 118, 0.18));
  border: 1px solid var(--border-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.9rem;
  margin-bottom: 24px;
}

.adv-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink-light);
  margin-bottom: 12px;
  font-family: 'STKaiti', 'KaiTi', serif;
}

.adv-desc {
  font-size: 0.98rem;
  color: var(--ink-muted);
  line-height: 1.75;
}

.pricing-section {
  background: rgba(7, 10, 14, 0.65);
}

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

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 44px 34px;
  display: flex;
  flex-direction: column;
  position: relative;
  backdrop-filter: blur(14px);
  transition: var(--transition-fast);
}

.pricing-card.featured {
  border-color: var(--accent-gold);
  background: linear-gradient(180deg, rgba(24, 34, 48, 0.94) 0%, rgba(14, 20, 30, 0.96) 100%);
  box-shadow: 0 12px 50px rgba(212, 175, 55, 0.22);
  transform: scale(1.04);
}

.pricing-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-ink);
}

.popular-badge {
  position: absolute;
  top: -16px;
  right: 28px;
  background: linear-gradient(135deg, var(--accent-gold), #b8860b);
  color: #070a0e;
  font-size: 0.85rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: 20px;
  letter-spacing: 1px;
}

.plan-name {
  font-size: 1.48rem;
  font-weight: 700;
  color: var(--ink-light);
  margin-bottom: 8px;
  font-family: 'STKaiti', 'KaiTi', serif;
}

.plan-desc {
  font-size: 0.9rem;
  color: var(--ink-muted);
  margin-bottom: 24px;
}

.plan-price-wrap {
  margin-bottom: 32px;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent-gold);
}

.price-num {
  font-size: 3.2rem;
  font-weight: 900;
  color: var(--ink-light);
  line-height: 1;
}

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

.plan-features {
  list-style: none;
  margin-bottom: 36px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.98rem;
  color: var(--ink-light);
  margin-bottom: 14px;
}

.check-icon {
  color: var(--accent-emerald);
  font-weight: 900;
  font-size: 1.1rem;
}

/* 9. Block 4: 常见问题与知识库 */
.kb-section {
  background: rgba(7, 10, 14, 0.5);
}

.kb-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 30px;
  display: flex;
  flex-direction: column;
  backdrop-filter: blur(14px);
  transition: var(--transition-fast);
  text-decoration: none;
  color: inherit;
}

.article-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-ink);
}

.article-tag {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: rgba(43, 138, 118, 0.16);
  padding: 4px 12px;
  border-radius: 4px;
  align-self: flex-start;
  margin-bottom: 14px;
}

.article-title {
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--ink-light);
  margin-bottom: 12px;
  line-height: 1.45;

  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-summary {
  font-size: 0.9rem;
  color: var(--ink-muted);
  margin-bottom: 22px;
  line-height: 1.65;
  flex-grow: 1;

  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.4);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 14px;
}

.read-more {
  color: var(--accent-gold);
  font-weight: 600;
}

.faq-section {
  background: rgba(7, 10, 14, 0.65);
}

.faq-wrapper {
  max-width: 880px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  backdrop-filter: blur(14px);
  transition: var(--transition-fast);
}

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

.faq-icon {
  font-size: 1.2rem;
  color: var(--accent-gold);
  transition: transform var(--transition-fast);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out, padding 0.35s ease-out;
  padding: 0 28px;
  color: var(--ink-muted);
  font-size: 0.96rem;
  line-height: 1.75;
}

.faq-item.active {
  border-color: var(--border-ink);
  background: var(--bg-card-hover);
}

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

.faq-item.active .faq-answer {
  max-height: 300px;
  padding-bottom: 22px;
}

/* 10. Block 5: 用户评价 */
.reviews-section {
  background: rgba(7, 10, 14, 0.55);
}

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

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 34px 28px;
  backdrop-filter: blur(14px);
  transition: var(--transition-fast);
  position: relative;
}

.review-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-ink);
}

.stars {
  color: var(--accent-gold);
  font-size: 1.1rem;
  margin-bottom: 16px;
  letter-spacing: 2px;
}

.review-text {
  font-size: 0.96rem;
  color: var(--ink-light);
  line-height: 1.75;
  margin-bottom: 24px;
}

.reviewer-info {
  display: flex;
  align-items: center;
  gap: 14px;
}

.avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-gold), var(--accent-cyan));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #000;
  font-size: 1.1rem;
}

.reviewer-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink-light);
}

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

/* 11. 页脚 */
.footer-section {
  background: rgba(4, 6, 9, 0.92);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 65px 0 32px 0;
  color: var(--ink-muted);
  backdrop-filter: blur(16px);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 2fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-col h4 {
  font-size: 1.1rem;
  color: var(--ink-light);
  margin-bottom: 20px;
  font-family: 'STKaiti', 'KaiTi', serif;
}

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

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--ink-muted);
  text-decoration: none;
  font-size: 0.92rem;
  transition: var(--transition-fast);
}

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

.keyword-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-item {
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink-muted);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-bottom {
  text-align: center;
  font-size: 0.85rem;
  padding-top: 25px;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

/* 12. 独立文章页专用 Style */
.article-page {
  padding-top: 120px;
  padding-bottom: 90px;
}

.article-container {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 24px;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-gold);
  text-decoration: none;
  font-weight: 600;
  margin-bottom: 24px;
  transition: var(--transition-fast);
}

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

.article-header-box {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-light);
}

.article-main-title {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--ink-light);
  line-height: 1.35;
  margin-bottom: 18px;
  font-family: 'STKaiti', 'KaiTi', serif;
}

.article-meta {
  display: flex;
  gap: 20px;
  font-size: 0.88rem;
  color: var(--ink-muted);
}

.article-content-body {
  font-size: 1.06rem;
  line-height: 1.85;
  color: #d1d5db;
  background: var(--bg-card);
  padding: 40px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  backdrop-filter: blur(16px);
}

.article-content-body h2 {
  font-size: 1.68rem;
  color: var(--ink-light);
  margin: 36px 0 16px 0;
  padding-left: 14px;
  border-left: 4px solid var(--accent-gold);
  font-family: 'STKaiti', 'KaiTi', serif;
}

.article-content-body h3 {
  font-size: 1.35rem;
  color: var(--accent-gold-light);
  margin: 26px 0 12px 0;
  font-family: 'STKaiti', 'KaiTi', serif;
}

.article-content-body p {
  margin-bottom: 20px;
}

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

.article-content-body li {
  margin-bottom: 8px;
}

.article-cta-box {
  margin: 45px 0 20px 0;
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.15), rgba(43, 138, 118, 0.15));
  border: 1px solid var(--border-ink);
  border-radius: var(--radius-lg);
  padding: 38px;
  text-align: center;
}

.article-cta-box h3 {
  font-size: 1.55rem;
  color: var(--ink-light);
  margin-bottom: 12px;
  font-family: 'STKaiti', 'KaiTi', serif;
}

.article-cta-box p {
  color: var(--ink-muted);
  margin-bottom: 24px;
}

/* 13. 响应式布局 */
@media (max-width: 1024px) {
  .hero-title { font-size: 3rem; }
  .hero-features-grid, .advantages-grid, .pricing-grid, .kb-grid, .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .pricing-card.featured { transform: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .mobile-toggle { display: flex; }
  .nav-menu {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background: #070a0e;
    flex-direction: column;
    justify-content: flex-start;
    padding: 40px 24px;
    transition: left 0.3s ease;
  }
  .nav-menu.open { left: 0; }
  .hero-title { font-size: 2.3rem; }
  .hero-features-grid, .advantages-grid, .pricing-grid, .kb-grid, .reviews-grid, .node-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid { grid-template-columns: 1fr; }
  .article-content-body { padding: 24px; }
}