/* ==========================================================================
   扬帆云 - 霜月冷白 (Frost Moon Cold White) 细节增强版 CSS 样式
   域名: yangfanyunjic.lol
   ========================================================================== */

/* 1. 全局变量定义 */
:root {
  --font-primary: 'Noto Sans SC', 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* 霜月冷白与极光蓝色彩轴 */
  --bg-main: #f4f7fb;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --bg-glass-nav: rgba(244, 247, 251, 0.88);
  
  --primary-blue: #0284c7;
  --primary-light: #38bdf8;
  --primary-dark: #0369a1;
  --accent-cyan: #06b6d4;
  --accent-rose: #e11d48;
  --accent-emerald: #10b981;
  --accent-purple: #8b5cf6;
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-sub: #64748b;

  --border-light: rgba(226, 232, 240, 0.9);
  --border-glow: rgba(56, 189, 248, 0.45);
  --shadow-sm: 0 4px 12px rgba(15, 23, 42, 0.03);
  --shadow-md: 0 10px 30px -5px rgba(15, 23, 42, 0.07);
  --shadow-lg: 0 20px 40px -10px rgba(15, 23, 42, 0.1);
  --shadow-blue: 0 10px 25px -5px rgba(2, 132, 199, 0.35);

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;

  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 2. 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(56, 189, 248, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(2, 132, 199, 0.06) 0%, transparent 50%);
  background-attachment: fixed;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 渐变文本特效 */
.gradient-text {
  background: linear-gradient(135deg, #0284c7 0%, #06b6d4 50%, #0369a1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.brand-title-highlight {
  color: var(--primary-blue);
  font-weight: 900;
  text-shadow: 0 2px 10px rgba(2, 132, 199, 0.15);
}

/* 3. 顶部导航栏 (页眉目录菜单) */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 76px;
  z-index: 1000;
  background: var(--bg-glass-nav);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border-light);
  transition: all 0.3s ease;
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

/* Logo 点击波纹与动画 */
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  user-select: none;
  position: relative;
  transition: transform 0.2s ease;
}

.logo:hover {
  transform: scale(1.03);
}

.logo-icon-wrapper {
  position: relative;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 14px;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.9);
}

.logo-svg {
  width: 30px;
  height: 30px;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.logo:hover .logo-svg {
  transform: rotate(-8deg) scale(1.1);
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.3rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  color: var(--text-main);
  line-height: 1.2;
}

.brand-domain {
  font-size: 0.75rem;
  color: var(--primary-blue);
  font-weight: 600;
  letter-spacing: 0.3px;
}

.logo-ripple {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--primary-light);
  transform: translate(-50%, -50%) scale(0);
  opacity: 0;
  pointer-events: none;
}

.logo.clicked .logo-ripple {
  animation: logoPulse 0.6s ease-out forwards;
}

@keyframes logoPulse {
  0% { transform: translate(-50%, -50%) scale(0.8); opacity: 0.6; }
  100% { transform: translate(-50%, -50%) scale(2.4); opacity: 0; }
}

/* 页眉导航目录菜单 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  position: relative;
  padding: 4px 0;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-blue);
  border-radius: 2px;
  transition: width 0.3s ease;
}

.nav-link:hover {
  color: var(--primary-blue);
}

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

.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.92rem;
  border-radius: 30px;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.3);
  transition: all var(--transition-fast);
}

.nav-cta-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.45);
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
}

/* 4. 章节结构 */
.main-content {
  padding-top: 76px;
}

.section {
  min-height: calc(100vh - 76px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 0;
  position: relative;
  box-sizing: border-box;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-tag {
  display: inline-block;
  padding: 6px 18px;
  background: rgba(2, 132, 199, 0.08);
  color: var(--primary-blue);
  font-weight: 700;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  border-radius: 20px;
  margin-bottom: 12px;
  border: 1px solid rgba(2, 132, 199, 0.15);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto;
}

/* 5. Section 1: Hero 主视觉区 (左右两栏布局 + 动态图卡) */
.hero-section {
  background: radial-gradient(circle at 40% 30%, rgba(255, 255, 255, 0.95) 0%, rgba(244, 247, 251, 0.7) 100%);
  overflow: hidden;
}

.hero-container-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.hero-left-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border-light);
  border-radius: 30px;
  font-size: 0.88rem;
  color: var(--text-muted);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-cyan);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.hero-title {
  font-size: 3.1rem;
  font-weight: 900;
  line-height: 1.25;
  color: var(--text-main);
  letter-spacing: -1px;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 1.12rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  line-height: 1.65;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 44px;
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 30px;
  font-size: 1rem;
  font-weight: 700;
  border-radius: 40px;
  transition: all var(--transition-smooth);
}

.primary-btn {
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff;
  box-shadow: var(--shadow-blue);
}

.primary-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(2, 132, 199, 0.45);
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
}

.recommend-btn {
  background: rgba(255, 255, 255, 0.95);
  color: var(--primary-blue);
  border: 1.5px solid rgba(2, 132, 199, 0.35);
  box-shadow: 0 4px 16px rgba(2, 132, 199, 0.12);
}

.recommend-btn:hover {
  transform: translateY(-2px);
  border-color: var(--primary-light);
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.08) 0%, rgba(56, 189, 248, 0.15) 100%);
  color: var(--primary-dark);
  box-shadow: 0 8px 22px rgba(2, 132, 199, 0.25);
}

.secondary-btn {
  background: rgba(255, 255, 255, 0.85);
  color: var(--text-main);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
}

.secondary-btn:hover {
  background: #ffffff;
  border-color: var(--primary-blue);
  color: var(--primary-blue);
  transform: translateY(-2px);
}

/* 关键数据看板 */
.hero-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  width: 100%;
}

.stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  padding: 18px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: transform var(--transition-fast);
}

.stat-card:hover {
  transform: translateY(-3px);
  border-color: rgba(2, 132, 199, 0.3);
  box-shadow: var(--shadow-md);
}

.stat-value {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--primary-blue);
  line-height: 1.1;
  margin-bottom: 4px;
}

.stat-unit {
  font-size: 0.95rem;
  font-weight: 600;
  margin-left: 2px;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-sub);
  font-weight: 500;
}

/* 右侧：动态图卡元素 (Dynamic Animated Dashboard Card) */
.hero-right-dynamic {
  position: relative;
  display: flex;
  justify-content: center;
}

.dynamic-dashboard-card {
  width: 100%;
  max-width: 440px;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.9);
  outline: 1px solid rgba(2, 132, 199, 0.18);
  border-radius: 24px;
  padding: 28px 24px;
  box-shadow: 0 20px 50px -10px rgba(2, 132, 199, 0.15), 0 10px 20px -5px rgba(15, 23, 42, 0.05);
  position: relative;
}

.floating-card {
  animation: floatSlow 6s ease-in-out infinite;
}

@keyframes floatSlow {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

.dash-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
}

.dash-status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 12px var(--accent-emerald);
}

.dash-main-title {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--text-main);
}

.dash-sub-title {
  font-size: 0.75rem;
  color: var(--text-sub);
}

.dash-live-badge {
  margin-left: auto;
  background: rgba(16, 185, 129, 0.1);
  color: var(--accent-emerald);
  font-size: 0.72rem;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 12px;
  border: 1px solid rgba(16, 185, 129, 0.3);
}

/* 动态传输波浪 */
.dash-speed-meter {
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.05) 0%, rgba(6, 182, 212, 0.08) 100%);
  border-radius: 16px;
  padding: 20px;
  text-align: center;
  margin-bottom: 20px;
  border: 1px solid rgba(2, 132, 199, 0.12);
}

.speed-number-wrap {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 4px;
}

.speed-val {
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--primary-blue);
  line-height: 1;
  font-family: 'Plus Jakarta Sans', sans-serif;
}

.speed-unit {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.speed-tag {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 6px;
  font-weight: 500;
}

.visual-wave-bar {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 6px;
  height: 36px;
  margin-top: 16px;
}

.wave-pillar {
  width: 6px;
  background: linear-gradient(to top, #0284c7, #38bdf8);
  border-radius: 4px;
  animation: wavePulse 1.4s ease-in-out infinite alternate;
}

.p1 { height: 40%; animation-delay: 0.1s; }
.p2 { height: 75%; animation-delay: 0.3s; }
.p3 { height: 100%; animation-delay: 0.5s; }
.p4 { height: 60%; animation-delay: 0.2s; }
.p5 { height: 90%; animation-delay: 0.6s; }
.p6 { height: 45%; animation-delay: 0.4s; }
.p7 { height: 80%; animation-delay: 0.1s; }
.p8 { height: 65%; animation-delay: 0.3s; }

@keyframes wavePulse {
  0% { transform: scaleY(0.4); opacity: 0.5; }
  100% { transform: scaleY(1); opacity: 1; }
}

/* 动态节点实时连通监测表 */
.dash-nodes-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.dash-node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.9);
  padding: 10px 14px;
  border-radius: 12px;
  border: 1px solid var(--border-light);
  font-size: 0.82rem;
}

.node-flag { font-weight: 700; color: var(--text-main); }

.node-bar-box {
  width: 90px;
  height: 6px;
  background: rgba(226, 232, 240, 0.8);
  border-radius: 4px;
  overflow: hidden;
}

.node-bar-fill {
  height: 100%;
  border-radius: 4px;
}
.fill-hk { width: 95%; background: var(--accent-emerald); }
.fill-jp { width: 88%; background: var(--accent-cyan); }
.fill-us { width: 75%; background: var(--primary-blue); }

.node-ping { font-weight: 700; font-size: 0.8rem; }
.ping-good { color: var(--accent-emerald); }

/* 悬浮微型卡片 */
.mini-float-badge {
  position: absolute;
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 16px;
  padding: 10px 14px;
  box-shadow: 0 10px 25px rgba(15, 23, 42, 0.08);
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 10;
}

.mini-icon { font-size: 1.4rem; }
.mini-title { font-size: 0.82rem; font-weight: 800; color: var(--text-main); }
.mini-sub { font-size: 0.72rem; color: var(--accent-emerald); font-weight: 600; }

.mini-badge-1 {
  top: -16px;
  right: -20px;
}

.mini-badge-2 {
  bottom: -20px;
  left: -20px;
}

.floating-card-slow { animation: floatSlow 5s ease-in-out infinite reverse; }
.floating-card-fast { animation: floatSlow 4s ease-in-out infinite 1s; }

/* 6. Section 2: 产品核心优势 (图文卡片) */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-smooth);
}

.feature-card:hover {
  transform: translateY(-6px);
  background: var(--bg-card-hover);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-lg);
}

.highlight-feature {
  border: 2px solid rgba(2, 132, 199, 0.4);
  background: rgba(255, 255, 255, 0.95);
}

.feature-badge {
  position: absolute;
  top: -12px;
  right: 24px;
  background: linear-gradient(135deg, #0284c7, #06b6d4);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 12px;
}

.feature-icon-box {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.blue-glow-box { background: rgba(2, 132, 199, 0.08); color: var(--primary-blue); }
.cyan-glow-box { background: rgba(6, 182, 212, 0.1); color: var(--accent-cyan); }
.indigo-glow-box { background: rgba(99, 102, 241, 0.1); color: #6366f1; }

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

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

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-main);
  font-weight: 500;
}

.feature-list li svg {
  color: var(--primary-blue);
  flex-shrink: 0;
}

/* 7. Section 3: 流媒体与 AI 支持图卡 */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.service-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-smooth);
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-glow);
}

.card-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.card-head-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.media-bg { background: rgba(225, 29, 72, 0.08); }
.ai-bg { background: rgba(2, 132, 199, 0.08); }

.card-head-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text-main);
}

.card-head-sub {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.badge-tags-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}

.service-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid var(--border-light);
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.02);
}

.brand-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.netflix-red { background: #e50914; box-shadow: 0 0 6px #e50914; }
.disney-blue { background: #113ccf; box-shadow: 0 0 6px #113ccf; }
.yt-red { background: #ff0000; box-shadow: 0 0 6px #ff0000; }
.hbo-purple { background: #5822b4; }
.hulu-green { background: #1ce783; }
.tiktok-cyan { background: #00f2fe; }
.spotify-green { background: #1ed760; }
.abema-dark { background: #111; }

.ai-green { background: #10a37f; box-shadow: 0 0 6px #10a37f; }
.ai-orange { background: #d97706; }
.ai-blue { background: #0284c7; }
.ai-purple { background: #8b5cf6; }
.ai-teal { background: #0d9488; }
.ai-dark { background: #333; }
.ai-red { background: #f43f5e; }
.ai-yellow { background: #eab308; }

.highlight-pill {
  background: rgba(2, 132, 199, 0.08);
  border-color: rgba(2, 132, 199, 0.25);
  color: var(--primary-blue);
}

.card-footer-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid var(--border-light);
  font-size: 0.88rem;
  color: var(--text-sub);
}

.text-link {
  color: var(--primary-blue);
  font-weight: 700;
  transition: color 0.2s;
}

.text-link:hover {
  color: var(--primary-dark);
}

/* 8. Section 4: 参考真实网上机场/梯子套餐价格对比表 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  align-items: stretch;
}

.price-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-smooth);
}

.price-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.popular-card {
  border: 2px solid var(--primary-blue);
  background: #ffffff;
  box-shadow: var(--shadow-md);
  transform: scale(1.03);
}

.popular-card:hover {
  transform: scale(1.03) translateY(-6px);
}

.popular-ribbon {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #0284c7, #0369a1);
  color: #ffffff;
  font-size: 0.76rem;
  font-weight: 800;
  padding: 4px 16px;
  border-radius: 12px;
  white-space: nowrap;
}

.price-header {
  text-align: center;
  margin-bottom: 24px;
}

.plan-name {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 4px;
}

.plan-desc {
  font-size: 0.82rem;
  color: var(--text-sub);
  margin-bottom: 16px;
}

.plan-price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 2px;
}

.plan-price .currency {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary-blue);
}

.plan-price .amount {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1;
}

.plan-price .period {
  font-size: 0.8rem;
  color: var(--text-sub);
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.price-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 12px 0;
  background: rgba(2, 132, 199, 0.08);
  color: var(--primary-blue);
  font-weight: 700;
  border-radius: 30px;
  border: 1px solid rgba(2, 132, 199, 0.2);
  transition: all var(--transition-fast);
}

.price-btn:hover {
  background: var(--primary-blue);
  color: #ffffff;
}

.primary-price-btn {
  background: linear-gradient(135deg, #0284c7 0%, #0369a1 100%);
  color: #ffffff;
  border: none;
  box-shadow: var(--shadow-blue);
}

.primary-price-btn:hover {
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
  box-shadow: 0 10px 22px rgba(2, 132, 199, 0.45);
}

/* 9. Section 5: 用户评价 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.review-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars {
  color: #f59e0b;
  font-size: 1.1rem;
  letter-spacing: 2px;
  margin-bottom: 14px;
}

.review-content {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 24px;
}

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

.avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.reviewer-name {
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--text-main);
}

.reviewer-role {
  font-size: 0.78rem;
  color: var(--text-sub);
}

/* 10. Section 6: 常见问题解答 FAQ */
.faq-accordion {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s;
}

.faq-item.active {
  border-color: var(--primary-blue);
  background: #ffffff;
}

.faq-question {
  width: 100%;
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  text-align: left;
}

.faq-icon {
  font-size: 1.4rem;
  color: var(--primary-blue);
  transition: transform 0.3s;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  max-height: 200px;
  padding: 0 24px 20px 24px;
}

.faq-answer p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* 10.1. Section: 30篇 SEO 文章图卡专区 */
.articles-section {
  background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.95) 0%, rgba(244, 247, 251, 0.7) 100%);
}

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

.article-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-smooth);
}

.article-card:hover {
  transform: translateY(-5px);
  background: #ffffff;
  border-color: var(--border-glow);
  box-shadow: var(--shadow-md);
}

.art-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.art-badge {
  background: rgba(2, 132, 199, 0.08);
  color: var(--primary-blue);
  font-size: 0.76rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 12px;
  border: 1px solid rgba(2, 132, 199, 0.15);
}

.art-card-date {
  font-size: 0.78rem;
  color: var(--text-sub);
}

.art-card-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.45;
  margin-bottom: 12px;
}

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

.art-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border-light);
}

.art-read-link {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-sub);
  transition: color 0.2s;
}

.art-read-link:hover {
  color: var(--primary-blue);
}

.art-direct-cta {
  font-size: 0.82rem;
  font-weight: 800;
  padding: 6px 14px;
  background: linear-gradient(135deg, #0284c7, #0369a1);
  color: #ffffff;
  border-radius: 20px;
  box-shadow: 0 4px 10px rgba(2, 132, 199, 0.25);
  transition: all 0.2s;
}

.art-direct-cta:hover {
  background: linear-gradient(135deg, #38bdf8, #0284c7);
  box-shadow: 0 6px 16px rgba(2, 132, 199, 0.4);
}

@media (max-width: 992px) {
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .articles-grid { grid-template-columns: 1fr; }
}

/* 11. 右侧悬浮章节箭头导航 */
.side-nav-controls {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  padding: 12px 8px;
  border-radius: 30px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
}

.side-nav-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(244, 247, 251, 0.9);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  border: 1px solid var(--border-light);
}

.side-nav-btn:hover {
  background: var(--primary-blue);
  color: #ffffff;
  transform: scale(1.12);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.3);
}

.side-nav-btn:active {
  transform: scale(0.95);
}

.side-nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
  background: rgba(244, 247, 251, 0.5);
  color: var(--text-sub);
}

.side-nav-indicator {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--primary-blue);
  letter-spacing: 0.5px;
  padding: 2px 0;
  user-select: none;
}

/* 12. 规定页脚 */
.footer-simple {
  background: #ffffff;
  border-top: 1px solid var(--border-light);
  padding: 40px 0;
  text-align: center;
}

.footer-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.footer-nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
}

.footer-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color 0.2s;
}

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

.footer-pbn-links {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-muted);
  background: rgba(2, 132, 199, 0.04);
  padding: 10px 24px;
  border-radius: 30px;
  border: 1px solid rgba(2, 132, 199, 0.12);
}

.pbn-label {
  font-weight: 700;
  color: var(--primary-blue);
}

.footer-pbn-link {
  font-weight: 600;
  color: var(--text-main);
  transition: all 0.2s ease;
}

.footer-pbn-link:hover {
  color: var(--primary-blue);
  text-decoration: underline;
}

.pbn-divider {
  color: rgba(226, 232, 240, 0.9);
  font-weight: 300;
}

.footer-copyright {
  font-size: 0.85rem;
  color: var(--text-sub);
}

.footer-domain {
  color: var(--primary-blue);
  font-weight: 600;
}

/* 13. 移动端响应式适配 (@media) */
@media (max-width: 1024px) {
  .hero-container-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .hero-right-dynamic {
    order: -1;
  }
  .hero-title { font-size: 2.6rem; }
  .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .popular-card { transform: none; }
  .popular-card:hover { transform: translateY(-6px); }
}

@media (max-width: 768px) {
  .nav-menu { display: none; } /* 移动端隐藏菜单，保持极简 */

  .section {
    min-height: auto;
    padding: 50px 0;
  }

  .navbar { height: 64px; }
  .main-content { padding-top: 64px; }
  
  .brand-name { font-size: 1.15rem; }
  .brand-domain { font-size: 0.68rem; }
  .nav-cta-btn { padding: 8px 14px; font-size: 0.85rem; }

  .hero-title { font-size: 2rem; }
  .hero-subtitle { font-size: 0.98rem; }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 10px;
  }

  .cta-btn {
    width: 100%;
    padding: 14px 20px;
    font-size: 0.98rem;
  }

  .hero-stats-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .stat-card { padding: 14px 8px; }
  .stat-value { font-size: 1.4rem; }

  .features-grid { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: 1fr; }
  .pricing-grid { grid-template-columns: 1fr; }
  .reviews-grid { grid-template-columns: 1fr; }

  .side-nav-controls {
    right: 10px;
    padding: 6px 4px;
  }
  .side-nav-btn { width: 34px; height: 34px; }

  .footer-nav-links {
    flex-direction: column;
    gap: 16px;
  }
}