/* ==========================================================================
   一元机场 (1Yuan Airport) - 赛博荧蓝极致极简原生样式表
   零重型库依赖 / 纯原生 CSS / 移动端优先 / 秒开级性能
   ========================================================================== */

:root {
  --bg-main: #060913;
  --bg-card: rgba(12, 20, 36, 0.78);
  --bg-card-hover: rgba(18, 32, 58, 0.95);
  --bg-elevated: #0f1b2e;
  
  --neon-blue: #00f0ff;
  --neon-blue-glow: rgba(0, 240, 255, 0.4);
  --neon-blue-deep: #0077ff;
  --neon-cyan: #38f4ff;
  --neon-green: #10b981;
  --neon-purple: #7928ca;
  
  --text-main: #f8fafc;
  --text-sub: #94a3b8;
  --text-dim: #64748b;
  
  --border-glow: rgba(0, 240, 255, 0.22);
  --border-active: rgba(0, 240, 255, 0.75);
  
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;
  
  --container-max: 1220px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background: 
    radial-gradient(circle at 10% 12%, rgba(0, 240, 255, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 90% 45%, rgba(0, 119, 255, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 50% 85%, rgba(121, 40, 202, 0.08) 0%, transparent 50%),
    var(--bg-main);
  background-attachment: fixed;
  line-height: 1.6;
}

/* 赛博高科技背景网格 */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(0, 240, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
  z-index: 0;
}

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

img, svg {
  vertical-align: middle;
}

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

/* 章节公用结构 */
.section-block {
  padding: 95px 0;
  position: relative;
  scroll-margin-top: 76px;
}

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 52px;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--neon-blue);
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.35);
  padding: 5px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  box-shadow: 0 0 18px rgba(0, 240, 255, 0.2);
}

.section-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--neon-blue);
  box-shadow: 0 0 8px var(--neon-blue);
  animation: neon-flicker 2s infinite ease-in-out;
}

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

.section-title {
  font-size: clamp(1.9rem, 3.6vw, 2.7rem);
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  line-height: 1.25;
}

.section-title .text-neon {
  color: var(--neon-blue);
  text-shadow: 0 0 25px var(--neon-blue-glow);
}

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

/* ==========================================================================
   页眉导航顶栏 (Header & Navigation)
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 100;
  background: rgba(6, 9, 19, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 240, 255, 0.16);
  box-shadow: 0 4px 25px rgba(0, 0, 0, 0.4);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

/* 左上角品牌 Logo */
.brand-logo-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  color: #fff;
  transition: all var(--transition-base);
}

.brand-icon-box {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.25), rgba(0, 119, 255, 0.15));
  border: 1px solid var(--neon-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 18px var(--neon-blue-glow);
  transition: all var(--transition-base);
}

.brand-icon-box svg {
  width: 24px;
  height: 24px;
  fill: var(--neon-blue);
  filter: drop-shadow(0 0 6px var(--neon-blue));
}

.brand-name {
  font-size: 1.32rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  background: linear-gradient(90deg, #ffffff 30%, var(--neon-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 6px;
}

.brand-tag {
  font-size: 0.7rem;
  font-weight: 700;
  color: #060913;
  background: var(--neon-blue);
  padding: 2px 7px;
  border-radius: 4px;
  box-shadow: 0 0 10px var(--neon-blue-glow);
}

.brand-logo-btn:hover .brand-icon-box {
  transform: rotate(15deg) scale(1.1);
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.8);
}

.brand-logo-btn:active .brand-icon-box {
  transform: scale(0.92);
}

/* 导航链接目录 */
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-sub);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding: 6px 0;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--neon-blue);
  box-shadow: 0 0 8px var(--neon-blue);
  transition: width var(--transition-fast);
}

.nav-links a:hover {
  color: #ffffff;
  text-shadow: 0 0 12px var(--neon-blue-glow);
}

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

.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 20px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 700;
  color: #060913;
  background: linear-gradient(135deg, #00f0ff, #38f4ff);
  box-shadow: 0 0 20px var(--neon-blue-glow);
  transition: all var(--transition-base);
  border: 1px solid #a5f9ff;
}

.nav-cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.75);
  background: #ffffff;
  color: #060913;
}

/* ==========================================================================
   按钮规范 (CTA Buttons)
   ========================================================================== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 34px;
  border-radius: var(--radius-md);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: #050811;
  background: linear-gradient(135deg, #00f0ff 0%, #00b4d8 100%);
  border: 1px solid #8efaff;
  box-shadow: 0 0 25px rgba(0, 240, 255, 0.45);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 0 40px rgba(0, 240, 255, 0.8);
  background: linear-gradient(135deg, #4ef6ff 0%, #00d2ff 100%);
}

.btn-primary:active {
  transform: translateY(0) scale(0.98);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 30px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 700;
  color: var(--neon-blue);
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.38);
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.12);
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
}

.btn-secondary:hover {
  background: rgba(0, 240, 255, 0.18);
  border-color: var(--neon-blue);
  box-shadow: 0 0 28px rgba(0, 240, 255, 0.35);
  transform: translateY(-2px);
  color: #fff;
}

.btn-block {
  width: 100%;
}

/* ==========================================================================
   1. 主视觉区 (Hero Section) - 左右分布双栏布局
   ========================================================================== */
.hero-section {
  padding: 70px 0 90px;
  position: relative;
}

.hero-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  gap: 48px;
  align-items: center;
}

/* 左侧标题与简介区 */
.hero-content {
  text-align: left;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--neon-blue);
  background: rgba(0, 240, 255, 0.08);
  border: 1px solid rgba(0, 240, 255, 0.35);
  padding: 6px 18px;
  border-radius: var(--radius-full);
  margin-bottom: 22px;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.18);
}

.hero-title {
  font-size: clamp(2.4rem, 4.4vw, 3.7rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.03em;
  margin-bottom: 22px;
  color: #ffffff;
}

.hero-title-highlight {
  background: linear-gradient(90deg, #00f0ff 10%, #7928ca 90%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  text-shadow: 0 0 35px rgba(0, 240, 255, 0.45);
}

.hero-desc {
  font-size: 1.12rem;
  color: var(--text-sub);
  margin-bottom: 34px;
  line-height: 1.75;
}

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

/* 信任指标栏 (左侧底部) */
.hero-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding: 18px 20px;
  background: rgba(12, 20, 36, 0.8);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-md);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

.stat-item {
  text-align: center;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.stat-item:last-child {
  border-right: none;
}

.stat-num {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--neon-blue);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-sub);
  margin-top: 4px;
}

/* ==========================================================================
   主视觉区右侧：赛博动态图卡 (Cyber Terminal & Radar Dashboard)
   ========================================================================== */
.hero-visual-card {
  background: rgba(9, 15, 29, 0.9);
  border: 1.5px solid var(--border-active);
  border-radius: var(--radius-lg);
  padding: 26px;
  box-shadow: 0 0 45px rgba(0, 240, 255, 0.22), 0 20px 50px rgba(0, 0, 0, 0.6);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

/* 扫描线动画效果 */
.hero-visual-card::after {
  content: "";
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, transparent 0%, rgba(0, 240, 255, 0.06) 50%, transparent 100%);
  animation: scanline 4.5s linear infinite;
  pointer-events: none;
}

@keyframes scanline {
  0% { top: -100%; }
  100% { top: 100%; }
}

.cyber-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(0, 240, 255, 0.18);
  padding-bottom: 14px;
  margin-bottom: 18px;
}

.cyber-status-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 700;
  color: #10b981;
}

.status-dot-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 10px #10b981;
  animation: pulse-green 1.8s infinite;
}

@keyframes pulse-green {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.cyber-term-title {
  font-family: monospace;
  font-size: 0.78rem;
  color: var(--neon-blue);
  letter-spacing: 0.08em;
}

/* 测速与延迟实时仪表 */
.cyber-speed-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 18px;
}

.speed-box {
  background: rgba(16, 26, 46, 0.8);
  border: 1px solid rgba(0, 240, 255, 0.2);
  border-radius: var(--radius-sm);
  padding: 14px;
  text-align: center;
}

.speed-box-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.speed-box-val {
  font-size: 1.45rem;
  font-weight: 900;
  color: #fff;
}

.speed-box-val span {
  font-size: 0.8rem;
  color: var(--neon-blue);
  margin-left: 2px;
}

/* 动态波形脉冲条 */
.wave-bars-container {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 4px;
  height: 48px;
  background: rgba(8, 14, 25, 0.7);
  border: 1px solid rgba(0, 240, 255, 0.15);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  margin-bottom: 18px;
}

.wave-bar {
  width: 7px;
  background: linear-gradient(180deg, var(--neon-blue) 0%, rgba(0, 119, 255, 0.2) 100%);
  border-radius: 2px;
  animation: wave-anim 1.4s ease-in-out infinite alternate;
}

.wave-bar:nth-child(1) { height: 35%; animation-delay: 0.1s; }
.wave-bar:nth-child(2) { height: 60%; animation-delay: 0.3s; }
.wave-bar:nth-child(3) { height: 85%; animation-delay: 0.15s; }
.wave-bar:nth-child(4) { height: 45%; animation-delay: 0.4s; }
.wave-bar:nth-child(5) { height: 95%; animation-delay: 0.2s; }
.wave-bar:nth-child(6) { height: 70%; animation-delay: 0.5s; }
.wave-bar:nth-child(7) { height: 100%; animation-delay: 0.1s; }
.wave-bar:nth-child(8) { height: 65%; animation-delay: 0.35s; }
.wave-bar:nth-child(9) { height: 90%; animation-delay: 0.25s; }
.wave-bar:nth-child(10){ height: 50%; animation-delay: 0.45s; }
.wave-bar:nth-child(11){ height: 80%; animation-delay: 0.15s; }
.wave-bar:nth-child(12){ height: 95%; animation-delay: 0.3s; }

@keyframes wave-anim {
  0% { transform: scaleY(0.4); opacity: 0.6; }
  100% { transform: scaleY(1); opacity: 1; filter: drop-shadow(0 0 6px var(--neon-blue)); }
}

/* 动态节点实时链路展示 */
.nodes-flow-list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.node-flow-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(14, 23, 40, 0.85);
  border: 1px solid rgba(0, 240, 255, 0.14);
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 0.84rem;
  transition: all var(--transition-fast);
}

.node-flow-item:hover {
  background: rgba(0, 240, 255, 0.1);
  border-color: var(--neon-blue);
  transform: translateX(4px);
}

.node-name-flag {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: #fff;
}

.node-ping-val {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #10b981;
  font-family: monospace;
  font-weight: 700;
  font-size: 0.82rem;
}

.node-ping-val::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #10b981;
}

/* ==========================================================================
   2. 产品核心优势介绍 (3个图文卡片)
   ========================================================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--neon-blue), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-active);
  box-shadow: 0 16px 40px rgba(0, 240, 255, 0.22);
  background: var(--bg-card-hover);
}

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

.feature-icon-wrapper {
  width: 62px;
  height: 62px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.15), rgba(0, 119, 255, 0.1));
  border: 1.5px solid rgba(0, 240, 255, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  box-shadow: 0 0 22px rgba(0, 240, 255, 0.25);
  transition: all var(--transition-base);
}

.feature-card:hover .feature-icon-wrapper {
  transform: scale(1.1) rotate(5deg);
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.6);
  border-color: var(--neon-blue);
}

.feature-icon-wrapper svg {
  width: 30px;
  height: 30px;
  stroke: var(--neon-blue);
  fill: none;
  filter: drop-shadow(0 0 5px var(--neon-blue));
}

.feature-title {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: #fff;
}

.feature-desc {
  font-size: 0.96rem;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 20px;
}

.feature-list {
  list-style: none;
  border-top: 1px dashed rgba(255, 255, 255, 0.12);
  padding-top: 16px;
}

.feature-list li {
  font-size: 0.88rem;
  color: #e2e8f0;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.feature-list li svg {
  width: 15px;
  height: 15px;
  fill: var(--neon-blue);
  flex-shrink: 0;
}

/* ==========================================================================
   3. 流媒体与 AI 支持图卡 (全新高精官方 SVG 矩阵)
   ========================================================================== */
.support-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.support-category-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 34px 30px;
  backdrop-filter: blur(14px);
  position: relative;
  transition: all var(--transition-base);
}

.support-category-card:hover {
  border-color: var(--border-active);
  box-shadow: 0 12px 35px rgba(0, 240, 255, 0.2);
}

.support-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}

.support-header-badge {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: rgba(0, 240, 255, 0.12);
  border: 1.5px solid var(--neon-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--neon-blue);
  box-shadow: 0 0 18px rgba(0, 240, 255, 0.25);
}

.support-header-badge svg {
  width: 24px;
  height: 24px;
  fill: var(--neon-blue);
}

.support-header h3 {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
}

.support-header p {
  font-size: 0.9rem;
  color: var(--text-sub);
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.support-badge-item {
  background: rgba(18, 30, 52, 0.7);
  border: 1px solid rgba(0, 240, 255, 0.16);
  border-radius: var(--radius-md);
  padding: 18px 12px;
  text-align: center;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 9px;
}

.support-badge-item:hover {
  background: rgba(0, 240, 255, 0.15);
  border-color: var(--neon-blue);
  transform: translateY(-4px);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.35);
}

.support-icon-svg {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.support-icon-svg svg {
  width: 100%;
  height: 100%;
  transition: transform var(--transition-fast);
}

.support-badge-item:hover .support-icon-svg svg {
  transform: scale(1.12);
}

.support-name {
  font-size: 0.88rem;
  font-weight: 700;
  color: #fff;
}

.support-desc {
  font-size: 0.74rem;
  color: var(--neon-blue);
  font-weight: 500;
}

.support-extra-banner {
  grid-column: 1 / -1;
  background: linear-gradient(90deg, rgba(0, 240, 255, 0.14) 0%, rgba(121, 40, 202, 0.14) 100%);
  border: 1.5px solid rgba(0, 240, 255, 0.35);
  border-radius: var(--radius-md);
  padding: 20px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  box-shadow: 0 0 25px rgba(0, 240, 255, 0.15);
}

.support-extra-text {
  font-size: 0.95rem;
  color: #fff;
  line-height: 1.6;
}

.support-extra-text strong {
  color: var(--neon-blue);
}

/* ==========================================================================
   4. 套餐价格对比表 (Pricing - 参考网上真实一元机场体系)
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 38px 30px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-base);
  backdrop-filter: blur(14px);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-active);
  box-shadow: 0 20px 45px rgba(0, 240, 255, 0.25);
}

/* 爆款招牌年付卡片高亮 (一元机场真正灵魂：¥11/年) */
.pricing-card.featured {
  background: linear-gradient(180deg, rgba(16, 32, 60, 0.98) 0%, rgba(10, 18, 34, 0.98) 100%);
  border: 2px solid var(--neon-blue);
  box-shadow: 0 0 40px rgba(0, 240, 255, 0.35);
  transform: scale(1.03);
  z-index: 2;
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-8px);
  box-shadow: 0 0 55px rgba(0, 240, 255, 0.55);
}

.pricing-badge-popular {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, #00f0ff, #0077ff);
  color: #060913;
  font-size: 0.8rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  padding: 5px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.7);
  white-space: nowrap;
}

.pricing-plan-name {
  font-size: 1.4rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 6px;
}

.pricing-plan-desc {
  font-size: 0.9rem;
  color: var(--text-sub);
  margin-bottom: 24px;
  min-height: 42px;
}

.pricing-price-box {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.price-currency {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--neon-blue);
}

.price-amount {
  font-size: 3.4rem;
  font-weight: 900;
  line-height: 1;
  color: #fff;
  letter-spacing: -0.03em;
}

.price-period {
  font-size: 0.9rem;
  color: var(--text-sub);
  margin-left: 6px;
}

.price-sub-calc {
  display: block;
  font-size: 0.82rem;
  color: var(--neon-blue);
  font-weight: 600;
  margin-top: 4px;
}

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

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-sub);
  margin-bottom: 14px;
}

.pricing-features li svg {
  width: 17px;
  height: 17px;
  stroke: var(--neon-blue);
  stroke-width: 2.5;
  flex-shrink: 0;
}

.pricing-features li.highlight {
  color: #fff;
  font-weight: 600;
}

.pricing-features li.highlight svg {
  filter: drop-shadow(0 0 6px var(--neon-blue));
}

/* ==========================================================================
   5. 用户口碑反馈 (Testimonials)
   ========================================================================== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-md);
  padding: 28px;
  backdrop-filter: blur(12px);
  transition: all var(--transition-base);
}

.review-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-active);
  box-shadow: 0 12px 30px rgba(0, 240, 255, 0.2);
}

.review-stars {
  color: #ffb703;
  margin-bottom: 14px;
  font-size: 1rem;
  letter-spacing: 2px;
}

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

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

.review-avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(0, 240, 255, 0.3), rgba(121, 40, 202, 0.3));
  border: 1.5px solid var(--neon-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.95rem;
  color: #fff;
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.25);
}

.review-info h4 {
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
}

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

/* ==========================================================================
   6. 常见问题解答 (FAQ Section)
   ========================================================================== */
.faq-accordion {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item:hover {
  border-color: rgba(0, 240, 255, 0.45);
}

.faq-item.active {
  border-color: var(--neon-blue);
  box-shadow: 0 0 25px rgba(0, 240, 255, 0.18);
}

.faq-question {
  width: 100%;
  text-align: left;
  padding: 20px 24px;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  transition: color var(--transition-fast);
}

.faq-question:hover {
  color: var(--neon-blue);
}

.faq-toggle-icon {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: var(--neon-blue);
  stroke-width: 2.2;
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), padding 0.35s ease;
  padding: 0 24px;
  color: var(--text-sub);
  font-size: 0.96rem;
  line-height: 1.75;
}

.faq-item.active .faq-answer {
  max-height: 250px;
  padding: 0 24px 22px;
}

/* ==========================================================================
   7. 底栏页脚 (Footer - 严格遵循用户四项标题与纯净规范)
   ========================================================================== */
.site-footer {
  background: #04060d;
  border-top: 1px solid rgba(0, 240, 255, 0.18);
  padding: 50px 0 38px;
  text-align: center;
  position: relative;
  z-index: 10;
}

.footer-nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 40px;
  list-style: none;
  margin-bottom: 26px;
  flex-wrap: wrap;
}

.footer-nav-list a {
  color: var(--text-sub);
  font-size: 1rem;
  font-weight: 700;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.footer-nav-list a:hover {
  color: var(--neon-blue);
  text-shadow: 0 0 14px var(--neon-blue-glow);
  background: rgba(0, 240, 255, 0.08);
}

.footer-copyright {
  font-size: 0.85rem;
  color: var(--text-dim);
  letter-spacing: 0.02em;
}

/* ==========================================================================
   8. 右侧浮动章节上下跳转导航
   ========================================================================== */
.floating-nav-panel {
  position: fixed;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 14px;
  z-index: 999;
}

.float-nav-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(10, 18, 34, 0.92);
  border: 1.5px solid rgba(0, 240, 255, 0.4);
  color: var(--neon-blue);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.6), 0 0 15px rgba(0, 240, 255, 0.25);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--transition-base);
  position: relative;
}

.float-nav-btn svg {
  width: 24px;
  height: 24px;
  stroke: var(--neon-blue);
  fill: none;
  stroke-width: 2.4;
  transition: transform var(--transition-fast);
}

.float-nav-btn:hover {
  background: rgba(0, 240, 255, 0.25);
  border-color: var(--neon-blue);
  box-shadow: 0 0 30px rgba(0, 240, 255, 0.7);
  transform: scale(1.15);
}

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

.float-nav-btn.btn-pulse-active {
  animation: neon-click-wave 0.5s ease-out;
}

@keyframes neon-click-wave {
  0% { box-shadow: 0 0 0 0 rgba(0, 240, 255, 0.95); }
  100% { box-shadow: 0 0 0 24px rgba(0, 240, 255, 0); }
}

.float-nav-btn .nav-tooltip {
  position: absolute;
  right: 60px;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(6, 12, 24, 0.96);
  border: 1px solid var(--neon-blue);
  color: #fff;
  padding: 5px 12px;
  border-radius: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.35);
}

.float-nav-btn:hover .nav-tooltip {
  opacity: 1;
}

/* ==========================================================================
   9. 文档页面通用排版样式 (关于我们 / 服务条款 / 隐私政策 / 网站地图)
   ========================================================================== */
.doc-page-body {
  padding-bottom: 60px;
}

.doc-container {
  max-width: 920px;
  margin: 40px auto 60px;
  padding: 0 24px;
}

.doc-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-dim);
  margin-bottom: 24px;
}

.doc-breadcrumb a {
  color: var(--neon-blue);
}

.doc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 44px 38px;
  box-shadow: 0 15px 45px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.doc-header {
  border-bottom: 1px solid rgba(0, 240, 255, 0.2);
  padding-bottom: 24px;
  margin-bottom: 32px;
}

.doc-header h1 {
  font-size: clamp(1.9rem, 3.6vw, 2.5rem);
  font-weight: 900;
  color: #fff;
  margin-bottom: 8px;
}

.doc-updated {
  font-size: 0.88rem;
  color: var(--text-dim);
}

.doc-content h2 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--neon-blue);
  margin: 34px 0 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.doc-content h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 20px;
  background: var(--neon-blue);
  border-radius: 2px;
  box-shadow: 0 0 10px var(--neon-blue);
}

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

.doc-content ul, .doc-content ol {
  color: var(--text-sub);
  margin: 0 0 22px 26px;
  line-height: 1.8;
}

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

.doc-content li strong {
  color: #fff;
}

.doc-highlight-box {
  background: rgba(0, 240, 255, 0.08);
  border-left: 4px solid var(--neon-blue);
  padding: 18px 22px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 22px 0;
}

.doc-highlight-box p {
  margin-bottom: 0;
  color: #f1f5f9;
}

.sitemap-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  margin-top: 26px;
}

.sitemap-card {
  background: rgba(18, 30, 52, 0.7);
  border: 1px solid rgba(0, 240, 255, 0.2);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: all var(--transition-fast);
}

.sitemap-card:hover {
  border-color: var(--neon-blue);
  box-shadow: 0 0 18px rgba(0, 240, 255, 0.25);
}

.sitemap-card h3 {
  font-size: 1.15rem;
  color: #fff;
  margin-bottom: 14px;
}

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

.sitemap-links li {
  margin-bottom: 9px;
}

.sitemap-links a {
  color: var(--text-sub);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.sitemap-links a:hover {
  color: var(--neon-blue);
}

/* ==========================================================================
   10. 移动端优先与媒体查询 (@media Queries)
   ========================================================================== */
@media (max-width: 1024px) {
  .hero-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .hero-content {
    text-align: center;
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .hero-stats-row {
    max-width: 700px;
    margin: 0 auto;
  }
  
  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }
}

@media (max-width: 868px) {
  .section-block {
    padding: 65px 0;
  }
  
  .nav-links {
    display: none; /* 移动端突出核心快速通道 */
  }
  
  .hero-stats-row {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }
  
  .stat-item:nth-child(2) {
    border-right: none;
  }
  
  .features-grid,
  .pricing-grid,
  .reviews-grid,
  .support-container {
    grid-template-columns: 1fr;
    gap: 22px;
  }
  
  .support-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .floating-nav-panel {
    right: 12px;
  }
  
  .float-nav-btn {
    width: 44px;
    height: 44px;
  }
  
  .float-nav-btn .nav-tooltip {
    display: none;
  }
  
  .sitemap-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }
  
  .nav-wrapper {
    height: 64px;
  }
  
  .brand-name {
    font-size: 1.15rem;
  }
  
  .hero-section {
    padding: 45px 0 60px;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-actions a {
    width: 100%;
  }
  
  .hero-stats-row {
    grid-template-columns: repeat(2, 1fr);
    padding: 16px 12px;
  }
  
  .stat-num {
    font-size: 1.35rem;
  }
  
  .support-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .footer-nav-list {
    gap: 20px;
    flex-direction: column;
  }
  
  .doc-card {
    padding: 26px 18px;
  }
}

/* ==========================================================================
   11. SEO 专题与技术博文专区样式 (图卡网格 Cards Grid)
   ========================================================================== */
.articles-section {
  padding: 85px 0;
  position: relative;
  scroll-margin-top: 76px;
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 36px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-base);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--neon-blue), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.article-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-active);
  box-shadow: 0 16px 36px rgba(0, 240, 255, 0.22);
  background: var(--bg-card-hover);
}

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

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

.article-card-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--neon-blue);
  background: rgba(0, 240, 255, 0.1);
  border: 1px solid rgba(0, 240, 255, 0.35);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

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

.article-card-title {
  font-size: 1.12rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.45;
  margin-bottom: 12px;
  transition: color var(--transition-fast);
}

.article-card:hover .article-card-title {
  color: var(--neon-blue);
}

.article-card-desc {
  font-size: 0.88rem;
  color: var(--text-sub);
  line-height: 1.65;
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

.article-card-readtime {
  font-size: 0.78rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 4px;
}

.article-card-link {
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--neon-blue);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: transform var(--transition-fast);
}

.article-card:hover .article-card-link {
  transform: translateX(4px);
  color: #fff;
}

.articles-aff-banner {
  background: linear-gradient(135deg, rgba(16, 26, 46, 0.95), rgba(8, 14, 25, 0.95));
  border: 1.5px solid var(--neon-blue);
  border-radius: var(--radius-lg);
  padding: 30px;
  margin-top: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  box-shadow: 0 0 35px rgba(0, 240, 255, 0.25);
}

.articles-aff-text h3 {
  font-size: 1.35rem;
  color: #fff;
  margin-bottom: 6px;
}

.articles-aff-text p {
  color: var(--text-sub);
  font-size: 0.94rem;
}

@media (max-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .articles-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .articles-aff-banner {
    flex-direction: column;
    text-align: center;
    padding: 24px 18px;
  }
}

/* ==========================================================================
   12. 重构与增强页脚专属样式 (SEO 专家与前端工程级重构)
   ========================================================================== */
.footer-divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 240, 255, 0.25), transparent);
  margin: 28px 0;
}

/* 信任背书徽章网格 */
.footer-trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 28px;
}

.footer-trust-item {
  background: rgba(14, 23, 40, 0.65);
  border: 1px solid rgba(0, 240, 255, 0.16);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.82rem;
  color: #cbd5e1;
  transition: all var(--transition-fast);
}

.footer-trust-item:hover {
  background: rgba(0, 240, 255, 0.12);
  border-color: var(--neon-blue);
  color: #fff;
  box-shadow: 0 0 16px rgba(0, 240, 255, 0.25);
  transform: translateY(-2px);
}

.footer-trust-item svg {
  width: 16px;
  height: 16px;
  fill: var(--neon-blue);
  flex-shrink: 0;
}

/* SEO 核心关键词与 PBN 权重传送矩阵 */
.footer-seo-matrix {
  margin-bottom: 24px;
  text-align: center;
}

.footer-seo-title {
  font-size: 0.8rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.footer-keywords-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.footer-keyword-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.82rem;
  color: var(--text-sub);
  background: rgba(18, 30, 52, 0.6);
  border: 1px solid rgba(0, 240, 255, 0.18);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.footer-keyword-tag::before {
  content: "#";
  color: var(--neon-blue);
  font-weight: 700;
}

.footer-keyword-tag:hover {
  color: #fff;
  border-color: var(--neon-blue);
  background: rgba(0, 240, 255, 0.15);
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.35);
  transform: translateY(-1px);
}

/* 免责声明与版权条 */
.footer-disclaimer-box {
  max-width: 860px;
  margin: 0 auto 18px;
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.7;
}

@media (max-width: 868px) {
  .footer-trust-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .footer-trust-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   13. 文章分类筛选药丸与赛博测速交互样式
   ========================================================================== */
.articles-filter-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.article-filter-btn {
  background: rgba(14, 23, 40, 0.7);
  border: 1px solid rgba(0, 240, 255, 0.25);
  color: var(--text-sub);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.article-filter-btn:hover {
  color: #fff;
  border-color: var(--neon-blue);
  background: rgba(0, 240, 255, 0.12);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.25);
}

.article-filter-btn.active {
  color: #050811;
  background: var(--neon-blue);
  border-color: #7df8ff;
  font-weight: 800;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.5);
}

.cyber-retest-btn {
  background: rgba(0, 240, 255, 0.12);
  border: 1px solid rgba(0, 240, 255, 0.4);
  color: var(--neon-blue);
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.cyber-retest-btn:hover {
  background: var(--neon-blue);
  color: #060913;
  box-shadow: 0 0 12px var(--neon-blue);
}