/* ===================================================================
   赔钱机场 - 官方极速推广落地页样式表 (Star-trail Cobalt Blue Pro)
   主题风格：星轨钴蓝 (Star-trail Cobalt Blue) 现代化极简、高阶深空科技
   特点：纯原生 CSS、零重型框架依赖、秒开级性能、移动端优先全自适应
=================================================================== */

:root {
  /* 星轨钴蓝调色板 */
  --cobalt-50: #eff6ff;
  --cobalt-100: #dbeafe;
  --cobalt-200: #bfdbfe;
  --cobalt-400: #60a5fa;
  --cobalt-500: #3b82f6;
  --cobalt-600: #2563eb;       /* 核心星轨钴蓝 */
  --cobalt-700: #1d4ed8;
  --cobalt-800: #1e40af;
  --cobalt-900: #1e3a8a;
  --cobalt-cyan: #38bdf8;      /* 星轨极光电青 */
  --cobalt-glow: rgba(37, 99, 235, 0.45);
  --cyan-glow: rgba(56, 189, 248, 0.35);

  /* 深邃星空背景体系 */
  --bg-space: #050811;          /* 深空基底 */
  --bg-surface: #0a1124;        /* 表面层 */
  --bg-card: rgba(13, 22, 45, 0.72); /* 悬浮玻璃卡片 */
  --bg-card-hover: rgba(20, 35, 71, 0.88);
  --border-subtle: rgba(56, 189, 248, 0.14);
  --border-hover: rgba(56, 189, 248, 0.45);

  /* 文字颜色 */
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-gold: #fbbf24;
  --accent-emerald: #10b981;

  /* 阴影与光晕 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 40px rgba(3, 7, 18, 0.65);
  --glow-primary: 0 0 28px rgba(37, 99, 235, 0.5);
  --glow-btn: 0 4px 22px rgba(37, 99, 235, 0.65);

  /* 基础尺寸 */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;
  --max-width: 1240px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-space);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

body {
  position: relative;
  overflow-x: hidden;
  background-color: var(--bg-space);
  background-image: 
    radial-gradient(circle at 10% 15%, rgba(37, 99, 235, 0.2) 0%, transparent 45%),
    radial-gradient(circle at 90% 40%, rgba(56, 189, 248, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 50% 85%, rgba(30, 58, 138, 0.25) 0%, transparent 60%);
  background-attachment: fixed;
  min-height: 100vh;
}

/* 背景星轨粒子与光网微动效 */
.star-trail-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  background-size: 48px 48px;
  background-image: 
    linear-gradient(to right, rgba(56, 189, 248, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(56, 189, 248, 0.035) 1px, transparent 1px);
  z-index: 0;
}

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

img, svg {
  vertical-align: middle;
  max-width: 100%;
}

/* 容器布局 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
  position: relative;
  z-index: 1;
}

/* 页面章节统一规范 */
.page-section {
  padding: 100px 0;
  position: relative;
  scroll-margin-top: 76px;
}

/* 章节头部公共样式 */
.section-header {
  text-align: center;
  max-width: 780px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--cobalt-cyan);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.28);
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-tag::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cobalt-cyan);
  box-shadow: 0 0 10px var(--cobalt-cyan);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #ffffff 40%, #93c5fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

/* ===================================================================
   顶部导航栏 (Navbar) & 导航目录
=================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 76px;
  background: rgba(5, 8, 17, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(56, 189, 248, 0.14);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: all var(--transition-fast);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

/* 左上角品牌Logo (可互动，回到顶端) */
.brand-logo-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: var(--radius-md);
  transition: transform var(--transition-fast), background var(--transition-fast);
  user-select: none;
}

.brand-logo-btn:hover {
  transform: translateY(-2px) scale(1.02);
  background: rgba(37, 99, 235, 0.14);
}

.brand-logo-btn:active {
  transform: scale(0.96);
}

.logo-icon-wrapper {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--cobalt-600) 0%, var(--cobalt-cyan) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 18px var(--cobalt-glow);
  position: relative;
  overflow: hidden;
}

.logo-icon-wrapper::after {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent 40%, rgba(255, 255, 255, 0.4) 50%, transparent 60%);
  animation: shine 3.5s infinite;
}

@keyframes shine {
  0% { transform: translateX(-100%) rotate(45deg); }
  25%, 100% { transform: translateX(100%) rotate(45deg); }
}

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

.brand-name {
  font-size: 1.28rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #ffffff 60%, var(--cobalt-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-slogan {
  font-size: 0.72rem;
  color: var(--cobalt-400);
  font-weight: 500;
  letter-spacing: 0.5px;
}

/* 顶部导航目录 (Menu) */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-link {
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 4px;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--cobalt-cyan);
  transform: scaleX(0);
  transition: transform var(--transition-fast);
  box-shadow: 0 0 8px var(--cobalt-cyan);
}

.nav-link:hover {
  color: #ffffff;
}

.nav-link:hover::after {
  transform: scaleX(1);
}

/* 导航右侧按钮 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 按钮基础通用规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 24px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--cobalt-600) 0%, var(--cobalt-700) 100%);
  color: #ffffff;
  box-shadow: var(--glow-btn);
  border: 1px solid rgba(255, 255, 255, 0.2);
  position: relative;
  overflow: hidden;
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--cobalt-500) 0%, var(--cobalt-600) 100%);
  box-shadow: 0 6px 26px rgba(37, 99, 235, 0.75);
  transform: translateY(-2px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: rgba(15, 23, 42, 0.65);
  color: var(--text-primary);
  border: 1px solid rgba(56, 189, 248, 0.3);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(30, 58, 138, 0.35);
  border-color: var(--cobalt-cyan);
  color: #ffffff;
  transform: translateY(-2px);
}

/* 2026年机场推荐专属高亮按钮 */
.btn-recommend {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.28) 0%, rgba(56, 189, 248, 0.22) 100%);
  color: #ffffff;
  border: 1.5px solid rgba(56, 189, 248, 0.65);
  box-shadow: 0 0 22px rgba(56, 189, 248, 0.35), inset 0 0 14px rgba(56, 189, 248, 0.18);
  position: relative;
  overflow: hidden;
}

.btn-recommend::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transition: 0.5s;
}

.btn-recommend:hover {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.55) 0%, rgba(56, 189, 248, 0.45) 100%);
  border-color: #38bdf8;
  color: #ffffff;
  box-shadow: 0 0 30px rgba(56, 189, 248, 0.65), inset 0 0 16px rgba(56, 189, 248, 0.3);
  transform: translateY(-2px);
}

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

.btn-recommend .recommend-icon {
  color: #fbbf24;
  filter: drop-shadow(0 0 6px rgba(251, 191, 36, 0.8));
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.05rem;
  font-weight: 700;
  border-radius: var(--radius-full);
}

/* ===================================================================
   第 1 章节：Hero 主视觉区 (左右分栏布局 + 动态图卡)
=================================================================== */
.hero-section {
  min-height: calc(100vh - 76px);
  padding-top: 120px;
  padding-bottom: 70px;
  display: flex;
  align-items: center;
  position: relative;
}

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

.hero-left {
  text-align: left;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 18px;
  border-radius: var(--radius-full);
  background: rgba(37, 99, 235, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.3);
  margin-bottom: 24px;
  animation: float 4s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald);
}

.hero-badge-text {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--cobalt-100);
}

.hero-headline {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -1px;
  margin-bottom: 22px;
}

.hero-headline .highlight {
  display: block;
  margin-top: 6px;
  background: linear-gradient(135deg, #60a5fa 0%, #38bdf8 50%, #93c5fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 0 35px rgba(56, 189, 248, 0.4);
}

.hero-subheadline {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 34px;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

/* 核心指标统计 */
.hero-stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  box-shadow: var(--shadow-lg);
}

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

.stat-item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -8px;
  top: 15%;
  height: 70%;
  width: 1px;
  background: rgba(255, 255, 255, 0.08);
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 800;
  color: #ffffff;
  font-feature-settings: "tnum";
  margin-bottom: 4px;
  background: linear-gradient(180deg, #ffffff 60%, var(--cobalt-200) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

/* Hero 右侧动态互动终端图卡 */
.hero-right {
  position: relative;
}

.hero-dynamic-card {
  background: rgba(11, 20, 42, 0.82);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(20px);
  padding: 28px 24px;
  box-shadow: 0 20px 50px rgba(3, 7, 18, 0.75), 0 0 35px rgba(37, 99, 235, 0.25);
  position: relative;
  overflow: hidden;
}

.hero-dynamic-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cobalt-cyan), transparent);
}

.console-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 18px;
  margin-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.console-header-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.console-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.console-dot.red { background: #ef4444; }
.console-dot.yellow { background: #f59e0b; }
.console-dot.green { background: #10b981; }

.console-status-live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--accent-emerald);
  font-weight: 600;
  background: rgba(16, 185, 129, 0.12);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.live-pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-emerald);
  animation: pulse-green 1.8s infinite;
}

@keyframes pulse-green {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.8); }
  70% { box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* 动态节点列表 */
.console-nodes-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.node-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(16, 28, 58, 0.55);
  border: 1px solid rgba(56, 189, 248, 0.12);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.node-row:hover {
  background: rgba(30, 58, 138, 0.35);
  border-color: rgba(56, 189, 248, 0.4);
  transform: translateX(4px);
}

.node-meta {
  display: flex;
  align-items: center;
  gap: 12px;
}

.node-flag {
  font-size: 1.3rem;
}

.node-title-group {
  display: flex;
  flex-direction: column;
}

.node-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: #ffffff;
}

.node-type {
  font-size: 0.75rem;
  color: var(--cobalt-400);
}

.node-metrics {
  display: flex;
  align-items: center;
  gap: 16px;
}

.node-ping {
  font-family: monospace;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.1);
  padding: 2px 8px;
  border-radius: 6px;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.node-load {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* 动态图卡悬浮装饰徽章 */
.floating-badge {
  position: absolute;
  background: rgba(11, 20, 42, 0.92);
  border: 1px solid rgba(56, 189, 248, 0.4);
  border-radius: var(--radius-full);
  padding: 8px 18px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5), 0 0 16px rgba(56, 189, 248, 0.3);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  color: #ffffff;
  backdrop-filter: blur(14px);
  z-index: 2;
  animation: float-badge 5s ease-in-out infinite alternate;
}

.floating-badge-top {
  top: -16px;
  right: -12px;
}

.floating-badge-bottom {
  bottom: -16px;
  left: -12px;
  animation-delay: -2.5s;
}

@keyframes float-badge {
  0% { transform: translateY(0px) rotate(0deg); }
  100% { transform: translateY(-8px) rotate(1deg); }
}

/* ===================================================================
   第 2 章节：核心优势 (3个图文卡片)
=================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 38px 32px;
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cobalt-cyan), transparent);
  opacity: 0.6;
}

.feature-number-badge {
  position: absolute;
  top: 24px;
  right: 28px;
  font-family: monospace;
  font-size: 1.2rem;
  font-weight: 800;
  color: rgba(56, 189, 248, 0.25);
  transition: color var(--transition-fast);
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: 0 16px 45px rgba(3, 7, 18, 0.75), 0 0 28px rgba(37, 99, 235, 0.28);
}

.feature-card:hover .feature-number-badge {
  color: var(--cobalt-cyan);
}

.feature-icon-box {
  width: 62px;
  height: 62px;
  border-radius: var(--radius-md);
  background: rgba(37, 99, 235, 0.18);
  border: 1px solid rgba(56, 189, 248, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cobalt-cyan);
  margin-bottom: 24px;
  transition: transform var(--transition-fast);
}

.feature-card:hover .feature-icon-box {
  transform: scale(1.1) rotate(2deg);
  background: rgba(37, 99, 235, 0.35);
  box-shadow: 0 0 24px var(--cobalt-glow);
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: #ffffff;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
  flex-grow: 1;
}

.feature-badge-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-pill {
  font-size: 0.78rem;
  font-weight: 500;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.05);
  color: var(--cobalt-200);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

/* ===================================================================
   第 3 章节：流媒体与 AI 支持图卡 (精工图标细节)
=================================================================== */
.unlock-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 42px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.unlock-categories {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.unlock-column-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.unlock-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.service-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: rgba(10, 17, 36, 0.65);
  border: 1px solid rgba(56, 189, 248, 0.12);
  transition: all var(--transition-fast);
}

.service-card:hover {
  background: rgba(30, 58, 138, 0.28);
  border-color: rgba(56, 189, 248, 0.4);
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.45);
}

.service-logo-circle {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.service-card:hover .service-logo-circle {
  transform: scale(1.08);
}

.service-info {
  display: flex;
  flex-direction: column;
}

.service-name {
  font-size: 0.98rem;
  font-weight: 700;
  color: #ffffff;
}

.service-status {
  font-size: 0.78rem;
  color: var(--accent-emerald);
  display: flex;
  align-items: center;
  gap: 4px;
  font-weight: 500;
}

.service-status::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-emerald);
}

/* ===================================================================
   第 4 章节：真实套餐价格对比表 (参考网上主流真实专线机场)
=================================================================== */
.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-subtle);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-smooth);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-hover);
  box-shadow: 0 20px 48px rgba(3, 7, 18, 0.8), 0 0 32px rgba(37, 99, 235, 0.22);
}

/* 推荐主打款高亮 */
.pricing-card.featured {
  background: linear-gradient(180deg, rgba(30, 58, 138, 0.4) 0%, rgba(13, 22, 45, 0.9) 100%);
  border: 2px solid var(--cobalt-500);
  box-shadow: 0 16px 45px rgba(37, 99, 235, 0.35);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-8px);
  border-color: var(--cobalt-cyan);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--cobalt-500) 0%, var(--cobalt-cyan) 100%);
  color: #030712;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  padding: 5px 16px;
  border-radius: var(--radius-full);
  box-shadow: 0 0 16px var(--cobalt-glow);
  text-transform: uppercase;
}

.plan-header {
  margin-bottom: 20px;
}

.plan-name {
  font-size: 1.45rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 6px;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.plan-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 12px;
}

.currency {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--cobalt-cyan);
}

.price-amount {
  font-size: 3.2rem;
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
}

.price-period {
  font-size: 0.92rem;
  color: var(--text-muted);
}

.plan-billing-note {
  font-size: 0.8rem;
  color: var(--cobalt-cyan);
  background: rgba(56, 189, 248, 0.1);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  display: inline-block;
  margin-bottom: 24px;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.plan-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 13px;
  margin-bottom: 34px;
  flex-grow: 1;
}

.plan-features-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

.plan-features-list li.highlight-item {
  color: #ffffff;
  font-weight: 600;
}

.check-icon {
  width: 18px;
  height: 18px;
  color: var(--accent-emerald);
  flex-shrink: 0;
}

/* ===================================================================
   第 5 章节：用户评价 (Testimonials)
=================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-fast);
}

.review-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.review-stars {
  color: var(--accent-gold);
  margin-bottom: 14px;
  display: flex;
  gap: 3px;
}

.review-comment {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 20px;
}

.reviewer-profile {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cobalt-700), var(--cobalt-500));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #ffffff;
  font-size: 0.95rem;
  border: 2px solid rgba(56, 189, 248, 0.35);
}

.reviewer-info {
  display: flex;
  flex-direction: column;
}

.reviewer-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: #ffffff;
}

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

/* ===================================================================
   第 6 章节：常见问题解答 (FAQ) 原生手风琴
=================================================================== */
.faq-accordion {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item.active {
  border-color: var(--border-hover);
  background: rgba(16, 27, 56, 0.85);
}

.faq-question-btn {
  width: 100%;
  padding: 22px 24px;
  background: transparent;
  border: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.faq-question-btn:hover {
  color: var(--cobalt-cyan);
}

.faq-chevron {
  width: 20px;
  height: 20px;
  color: var(--cobalt-400);
  transition: transform var(--transition-smooth);
  flex-shrink: 0;
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
  color: var(--cobalt-cyan);
}

.faq-answer-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-smooth), opacity var(--transition-fast);
  opacity: 0;
  padding: 0 24px;
}

.faq-item.active .faq-answer-panel {
  max-height: 280px;
  opacity: 1;
  padding-bottom: 22px;
}

.faq-answer-panel p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===================================================================
   第 7 章节：页脚 (Footer)
=================================================================== */
.site-footer {
  background: #03050c;
  border-top: 1px solid rgba(56, 189, 248, 0.15);
  padding: 60px 0 40px;
  margin-top: 60px;
  position: relative;
  z-index: 10;
}

.footer-nav-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 48px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.footer-title-link {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  position: relative;
  padding: 8px 12px;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-title-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 12px;
  right: 12px;
  height: 2px;
  background: var(--cobalt-cyan);
  transform: scaleX(0);
  transition: transform var(--transition-fast);
  box-shadow: 0 0 8px var(--cobalt-cyan);
}

.footer-title-link:hover {
  color: var(--cobalt-cyan);
}

.footer-title-link:hover::after {
  transform: scaleX(1);
}

.footer-copy {
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

/* 页脚高级信任徽章体系 (SEO 与信任背书) */
.footer-trust-badges {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  margin: 28px 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.trust-badge-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-secondary);
  background: rgba(14, 24, 46, 0.6);
  border: 1px solid rgba(56, 189, 248, 0.2);
  padding: 6px 14px;
  border-radius: var(--radius-full);
}

.trust-badge-item svg {
  color: var(--cobalt-cyan);
}

/* 页脚底部状态行 */
.footer-bottom-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.82rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 12px;
}

.footer-pbn-link {
  color: var(--cobalt-400);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition-fast);
}

.footer-pbn-link:hover {
  color: var(--cobalt-cyan);
}

.footer-seo-link {
  color: var(--cobalt-cyan);
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.footer-seo-link:hover {
  color: #ffffff;
  text-shadow: 0 0 10px var(--cobalt-glow);
  text-decoration: underline;
}

/* ===================================================================
   右侧悬浮章节导航控制器 (Section Navigator)
=================================================================== */
.side-nav-controller {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  z-index: 999;
  background: rgba(10, 17, 36, 0.75);
  border: 1px solid rgba(56, 189, 248, 0.2);
  padding: 12px 8px;
  border-radius: var(--radius-full);
  backdrop-filter: blur(14px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.5), 0 0 16px rgba(37, 99, 235, 0.25);
  transition: opacity var(--transition-fast);
}

.side-nav-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(37, 99, 235, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--cobalt-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  outline: none;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-fast);
}

.side-nav-btn:hover {
  background: var(--cobalt-600);
  color: #ffffff;
  border-color: #ffffff;
  transform: scale(1.1);
  box-shadow: 0 0 16px var(--cobalt-glow);
}

.side-nav-btn:active {
  transform: scale(0.92);
}

.side-nav-btn .ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.7);
  transform: scale(0);
  animation: ripple-effect 0.6s linear;
  pointer-events: none;
}

@keyframes ripple-effect {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

.side-nav-dots {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 6px 0;
}

.nav-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(148, 163, 184, 0.3);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-dot.active {
  background: var(--cobalt-cyan);
  height: 20px;
  border-radius: 10px;
  box-shadow: 0 0 10px var(--cobalt-cyan);
}

.nav-dot:hover {
  background: var(--cobalt-400);
}

/* ===================================================================
   SEO 文章图卡专栏样式 (位于价格板块下方)
=================================================================== */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cobalt-cyan), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  box-shadow: 0 16px 40px rgba(3, 7, 18, 0.7), 0 0 25px rgba(37, 99, 235, 0.22);
}

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

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

.article-cat-tag {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--cobalt-cyan);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.article-date-text {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.article-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 12px;
  color: #ffffff;
}

.article-card-title a {
  color: #ffffff;
}

.article-card-title a:hover {
  color: var(--cobalt-cyan);
}

.article-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
  flex-grow: 1;
}

.article-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.article-read-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--cobalt-cyan);
}

.article-read-btn:hover {
  color: #ffffff;
  transform: translateX(3px);
}

.article-direct-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  color: #ffffff;
  background: rgba(37, 99, 235, 0.3);
  border: 1px solid rgba(56, 189, 248, 0.35);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.article-direct-btn:hover {
  background: var(--cobalt-600);
  border-color: #38bdf8;
  box-shadow: 0 0 12px var(--cobalt-glow);
}

/* ===================================================================
   响应式媒体查询 (@media) - 移动端优先适配
=================================================================== */
@media (max-width: 1100px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-left {
    text-align: center;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .hero-right {
    max-width: 620px;
    margin: 0 auto;
    width: 100%;
  }
  .nav-menu {
    gap: 18px;
  }
}

@media (max-width: 1024px) {
  .features-grid,
  .pricing-grid,
  .articles-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .pricing-card.featured {
    transform: none;
  }
  .pricing-card.featured:hover {
    transform: translateY(-6px);
  }
}

@media (max-width: 860px) {
  .nav-menu {
    display: none; /* 移动端顶部空间小，隐藏居中目录以确保操作清晰 */
  }
}

@media (max-width: 768px) {
  .page-section {
    padding: 60px 0;
  }
  .navbar {
    height: 66px;
  }
  .hero-section {
    padding-top: 96px;
    padding-bottom: 50px;
    min-height: auto;
  }
  .hero-headline {
    font-size: 2.2rem;
    line-height: 1.25;
  }
  .hero-subheadline {
    font-size: 1.02rem;
    margin-bottom: 28px;
  }
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }
  .hero-cta-group .btn {
    width: 100%;
    min-height: 48px;
  }
  .hero-stats-bar {
    grid-template-columns: 1fr 1fr;
    padding: 18px 14px;
    gap: 14px;
  }
  .stat-value {
    font-size: 1.55rem;
  }
  .stat-label {
    font-size: 0.75rem;
  }
  .unlock-categories {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .unlock-wrapper {
    padding: 24px 18px;
  }
  .unlock-grid {
    grid-template-columns: 1fr;
  }
  .footer-nav-container {
    flex-direction: column;
    gap: 16px;
  }
  .side-nav-controller {
    right: 12px;
    padding: 8px 6px;
  }
  .side-nav-btn {
    width: 36px;
    height: 36px;
  }
  .side-nav-dots {
    display: none;
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  .section-title {
    font-size: 1.75rem;
  }
  .price-amount {
    font-size: 2.6rem;
  }
}