/* ===================================================================
   迷雾通 (Geph) 官方推广落地页 - 核心样式表
   【风格 7：流体水银 · 量子暗涌风 (Liquid Metal & Quantum Flux)】
   极简无依赖 原生 CSS3 规范 | 极速秒开 | 移动端自适应响应式
=================================================================== */

:root {
  /* 深海铬黑基底与量子质感背景 */
  --bg-primary: #060913;
  --bg-secondary: #090e1d;
  --bg-card: rgba(13, 20, 38, 0.75);
  --bg-card-hover: rgba(19, 31, 58, 0.88);
  
  /* 水银与金属微光边框 */
  --border-color: rgba(148, 163, 184, 0.14);
  --border-hover: rgba(56, 189, 248, 0.45);
  --border-metal: linear-gradient(135deg, rgba(255, 255, 255, 0.25) 0%, rgba(56, 189, 248, 0.4) 50%, rgba(255, 255, 255, 0.08) 100%);
  
  /* 流体水银与金属反射色彩阶 */
  --mercury-highlight: #ffffff;
  --mercury-silver: #e2e8f0;
  --mercury-mid: #94a3b8;
  --mercury-dark: #475569;
  
  /* 量子电光色系 */
  --quantum-blue: #38bdf8;
  --quantum-blue-glow: rgba(56, 189, 248, 0.4);
  --primary: #38bdf8;
  --primary-glow: rgba(56, 189, 248, 0.4);
  --quantum-indigo: #6366f1;
  --quantum-indigo-glow: rgba(99, 102, 241, 0.35);
  --cyan: #06b6d4;
  --cyan-glow: rgba(6, 182, 212, 0.35);
  --emerald: #10b981;
  --amber: #f59e0b;
  --rose: #f43f5e;
  
  /* 文本阶梯 */
  --text-main: #f8fafc;
  --text-muted: #cbd5e1;
  --text-sub: #94a3b8;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  /* 流体水银与量子暗涌多重弥散光晕 */
  background-image: 
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(56, 189, 248, 0.16) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 85% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 55%),
    radial-gradient(ellipse 70% 60% at 50% 75%, rgba(6, 182, 212, 0.11) 0%, transparent 60%),
    radial-gradient(circle at 10% 70%, rgba(148, 163, 184, 0.08) 0%, transparent 45%);
  background-attachment: fixed;
}

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

ul, ol {
  list-style: none;
}

img, svg {
  display: block;
  max-width: 100%;
}

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

/* ===================================================================
   按钮规范 (流体水银与金属反射质感)
=================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 12px 26px;
  border-radius: var(--radius-full);
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
  user-select: none;
  position: relative;
  overflow: hidden;
}

/* 水银量子主按钮 */
.btn-primary {
  background: linear-gradient(135deg, #0284c7 0%, #38bdf8 45%, #6366f1 100%);
  color: #ffffff;
  box-shadow: 0 4px 22px var(--quantum-blue-glow), inset 0 1px 1px rgba(255, 255, 255, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -70%;
  width: 200%;
  height: 200%;
  background: linear-gradient(60deg, transparent 35%, rgba(255, 255, 255, 0.3) 50%, transparent 65%);
  transform: rotate(25deg);
  transition: all 0.65s ease;
  opacity: 0;
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0ea5e9 0%, #7dd3fc 45%, #818cf8 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(56, 189, 248, 0.6), 0 0 20px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover::after {
  left: 100%;
  opacity: 1;
}

/* 液态金属副按钮 */
.btn-secondary {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.02) 100%);
  border: 1px solid rgba(226, 232, 240, 0.22);
  color: #f1f5f9;
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.18), 0 4px 16px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(14px);
}

.btn-secondary:hover {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.15) 0%, rgba(255, 255, 255, 0.06) 100%);
  border-color: #38bdf8;
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(56, 189, 248, 0.35), inset 0 1px 1px rgba(255, 255, 255, 0.3);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.02);
  border-color: var(--border-color);
  color: var(--text-muted);
}

.btn-outline:hover {
  border-color: var(--quantum-blue);
  color: #ffffff;
  background: rgba(56, 189, 248, 0.1);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.25);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 16px 38px;
  font-size: 1.1rem;
}

.btn-block {
  width: 100%;
}

/* ===================================================================
   渐变文本 (水银光泽与量子脉冲)
=================================================================== */
.text-gradient {
  background: linear-gradient(135deg, #ffffff 10%, #f1f5f9 35%, #94a3b8 55%, #38bdf8 80%, #818cf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.text-gradient-cyan {
  background: linear-gradient(135deg, #38bdf8 0%, #06b6d4 45%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 区域公共标题 */
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px auto;
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, rgba(56, 189, 248, 0.12) 0%, rgba(99, 102, 241, 0.08) 100%);
  border: 1px solid rgba(56, 189, 248, 0.35);
  color: #7dd3fc;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
  box-shadow: 0 0 14px rgba(56, 189, 248, 0.18);
}

.section-title {
  font-size: 2.35rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

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

/* ===================================================================
   导航栏 (Navbar - 水银玻璃悬浮)
=================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: var(--transition);
  background: rgba(6, 9, 19, 0.68);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid transparent;
}

.navbar.scrolled {
  background: rgba(6, 9, 19, 0.94);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.55), inset 0 -1px 0 rgba(255, 255, 255, 0.04);
}

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

/* 品牌 Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.brand-icon-box {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  background: linear-gradient(135deg, #0284c7 0%, #38bdf8 50%, #94a3b8 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.5), inset 0 1px 2px rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.brand-logo span {
  font-weight: 800;
  background: linear-gradient(135deg, #ffffff 40%, #bae6fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* 导航链接 */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

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

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, #38bdf8, #e2e8f0);
  transition: width 0.25s ease;
  border-radius: 2px;
  box-shadow: 0 0 8px rgba(56, 189, 248, 0.6);
}

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

/* 右侧转化按钮 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hamburger-btn {
  display: none;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  padding: 0;
  transition: var(--transition);
}

.hamburger-btn:hover {
  border-color: var(--quantum-blue);
  background: rgba(56, 189, 248, 0.08);
}

/* ===================================================================
   首屏横幅区 (Hero Section)
=================================================================== */
.hero-section {
  position: relative;
  padding-top: 170px;
  padding-bottom: 90px;
  text-align: center;
  overflow: hidden;
}

.hero-glow-bg {
  position: absolute;
  top: 8%;
  left: 50%;
  transform: translateX(-50%);
  width: 750px;
  height: 420px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.22) 0%, rgba(99, 102, 241, 0.15) 40%, transparent 70%);
  filter: blur(85px);
  z-index: -1;
  pointer-events: none;
}

.hero-promo-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, rgba(245, 158, 11, 0.14) 0%, rgba(56, 189, 248, 0.1) 100%);
  border: 1px solid rgba(245, 158, 11, 0.4);
  color: #fbbf24;
  font-weight: 700;
  font-size: 0.92rem;
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.25);
  animation: mercury-pulse 2.8s infinite;
}

.hero-promo-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #fbbf24;
  box-shadow: 0 0 10px #fbbf24;
}

@keyframes mercury-pulse {
  0%, 100% {
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.25);
  }
  50% {
    box-shadow: 0 0 30px rgba(56, 189, 248, 0.45);
  }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1px;
  max-width: 960px;
  margin: 0 auto 24px auto;
}

.hero-subtitle {
  font-size: 1.22rem;
  color: var(--text-sub);
  max-width: 820px;
  margin: 0 auto 40px auto;
  line-height: 1.75;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 50px;
}

.hero-trust-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  padding-top: 30px;
  border-top: 1px solid var(--border-color);
  max-width: 880px;
  margin: 0 auto;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.trust-item svg {
  color: var(--quantum-blue);
}

/* ===================================================================
   核心优势图卡区 (Dynamic Cards Section - 水银钛金属质感)
=================================================================== */
.features-section {
  padding: 90px 0;
  position: relative;
}

.cards-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 40px;
}

.feature-card {
  background: linear-gradient(160deg, rgba(14, 22, 42, 0.82) 0%, rgba(8, 13, 26, 0.88) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 38px 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(16px);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, #38bdf8, #e2e8f0, transparent);
  opacity: 0;
  transition: var(--transition);
}

.feature-card:hover {
  background: linear-gradient(160deg, rgba(20, 32, 62, 0.9) 0%, rgba(11, 18, 36, 0.92) 100%);
  border-color: var(--border-hover);
  transform: translateY(-6px);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.6), 0 0 30px rgba(56, 189, 248, 0.16);
}

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

.feature-icon-wrapper {
  width: 58px;
  height: 58px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.12) 0%, rgba(99, 102, 241, 0.15) 100%);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--quantum-blue);
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.2);
  transition: var(--transition);
}

.feature-card:hover .feature-icon-wrapper {
  background: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
  color: #ffffff;
  transform: scale(1.08);
  box-shadow: 0 0 24px var(--quantum-blue-glow);
}

.feature-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.7;
}

/* 流媒体与 AI 支持图卡 */
.streaming-ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.media-ai-card {
  background: linear-gradient(160deg, rgba(14, 22, 42, 0.85) 0%, rgba(8, 13, 26, 0.9) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 38px 34px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: 0 14px 38px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.media-ai-card:hover {
  border-color: rgba(56, 189, 248, 0.45);
  transform: translateY(-4px);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.6), 0 0 35px rgba(56, 189, 248, 0.2);
}

.card-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  background: rgba(56, 189, 248, 0.15);
  color: #7dd3fc;
  border: 1px solid rgba(56, 189, 248, 0.35);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.18);
}

.card-tag.tag-ai {
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
  border-color: rgba(99, 102, 241, 0.35);
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.18);
}

.logo-badge-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.badge-pill {
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(226, 232, 240, 0.12);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: #e2e8f0;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.badge-pill:hover {
  background: rgba(56, 189, 248, 0.12);
  border-color: rgba(56, 189, 248, 0.35);
  color: #ffffff;
}

/* ===================================================================
   定价卡片区 (Pricing Section - 量子水银尊享卡)
=================================================================== */
.pricing-section {
  padding: 90px 0;
  position: relative;
}

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

.pricing-card {
  background: linear-gradient(165deg, rgba(14, 22, 42, 0.82) 0%, rgba(8, 13, 26, 0.9) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 42px 34px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
  backdrop-filter: blur(16px);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-hover);
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.65), 0 0 30px rgba(56, 189, 248, 0.18);
}

/* 推荐高亮卡片 (VIP2 - 量子聚核高光) */
.pricing-card.featured {
  background: linear-gradient(180deg, rgba(18, 30, 60, 0.92) 0%, rgba(9, 16, 33, 0.96) 100%);
  border: 2px solid #38bdf8;
  box-shadow: 0 16px 45px rgba(0, 0, 0, 0.6), 0 0 40px rgba(56, 189, 248, 0.3), inset 0 1px 2px rgba(255, 255, 255, 0.25);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-8px);
  box-shadow: 0 28px 60px rgba(0, 0, 0, 0.75), 0 0 50px rgba(56, 189, 248, 0.45);
}

.badge-recommended {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #0284c7 0%, #38bdf8 50%, #6366f1 100%);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 5px 20px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 18px var(--quantum-blue-glow), inset 0 1px 1px rgba(255, 255, 255, 0.4);
  letter-spacing: 0.5px;
}

.pricing-header {
  margin-bottom: 24px;
}

.plan-name {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--text-main);
}

.plan-desc {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.6;
  min-height: 48px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 20px 0 12px 0;
}

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

.amount {
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1;
  color: #ffffff;
  background: linear-gradient(180deg, #ffffff 40%, #bae6fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.period {
  font-size: 0.95rem;
  color: var(--text-sub);
}

.plan-traffic-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  background: rgba(56, 189, 248, 0.12);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.28);
  margin-bottom: 24px;
}

.plan-features-list {
  margin: 16px 0 32px 0;
  flex-grow: 1;
}

.plan-feature-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: #cbd5e1;
  margin-bottom: 14px;
}

.plan-feature-item svg {
  color: var(--emerald);
  flex-shrink: 0;
}

/* ===================================================================
   深度特性解析区 (Why Choose Section)
=================================================================== */
.why-us-section {
  padding: 90px 0;
  position: relative;
}

.why-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 80px;
}

.why-row:last-child {
  margin-bottom: 0;
}

.why-row.reverse {
  direction: rtl;
}

.why-row.reverse > * {
  direction: ltr;
}

.why-content h3 {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 18px;
}

.why-content p {
  font-size: 1.05rem;
  color: var(--text-sub);
  line-height: 1.75;
  margin-bottom: 24px;
}

.why-points {
  margin-bottom: 28px;
}

.why-point-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
  font-size: 0.98rem;
  color: #e2e8f0;
}

.why-point-item svg {
  color: var(--quantum-blue);
  flex-shrink: 0;
  margin-top: 3px;
}

/* 动态数据面板 (Quantum Telemetry) */
.data-panel-card {
  background: linear-gradient(160deg, rgba(14, 22, 42, 0.88) 0%, rgba(8, 13, 26, 0.94) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(16px);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 22px;
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-main);
}

.panel-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--emerald);
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.panel-status .pulse-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--emerald);
  box-shadow: 0 0 10px var(--emerald);
}

.metric-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 22px;
}

.metric-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  padding: 16px;
  border-radius: var(--radius-md);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.metric-label {
  font-size: 0.8rem;
  color: var(--text-sub);
  margin-bottom: 6px;
}

.metric-value {
  font-size: 1.45rem;
  font-weight: 800;
  color: #ffffff;
  font-family: var(--font-mono);
}

.metric-value.cyan {
  color: var(--quantum-blue);
  text-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}

.metric-value.emerald {
  color: var(--emerald);
  text-shadow: 0 0 15px rgba(16, 185, 129, 0.35);
}

.bandwidth-bar-wrap {
  margin-top: 14px;
}

.bandwidth-bar-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-sub);
  margin-bottom: 6px;
}

.progress-track {
  height: 8px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 86%;
  background: linear-gradient(90deg, #0284c7, #38bdf8, #cbd5e1);
  border-radius: 4px;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.6);
}

/* 终端代码块 (Strict_No_Logs_Policy.sh) */
.terminal-window {
  background: #060810;
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: var(--radius-md);
  box-shadow: 0 24px 55px rgba(0, 0, 0, 0.75), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

.terminal-header {
  background: #0d1222;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.terminal-dots {
  display: flex;
  gap: 7px;
}

.terminal-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

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

.terminal-filename {
  font-size: 0.82rem;
  color: #94a3b8;
}

.terminal-body {
  padding: 22px 24px;
  color: #e2e8f0;
  line-height: 1.65;
  background: #060810;
  overflow-x: auto;
}

.term-comment { color: #64748b; }
.term-prompt { color: var(--emerald); font-weight: 700; }
.term-cmd { color: #f8fafc; font-weight: 600; }
.term-kw { color: #38bdf8; }
.term-str { color: #a5b4fc; }
.term-ok { color: var(--emerald); font-weight: 700; text-shadow: 0 0 8px rgba(16, 185, 129, 0.4); }

/* ===================================================================
   底部转化区 (CTA Section)
=================================================================== */
.cta-banner-section {
  padding: 90px 0;
  position: relative;
}

.cta-banner-box {
  background: linear-gradient(135deg, rgba(16, 26, 52, 0.9) 0%, rgba(8, 14, 28, 0.96) 100%);
  border: 1px solid rgba(56, 189, 248, 0.38);
  border-radius: var(--radius-lg);
  padding: 70px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 25px 65px rgba(0, 0, 0, 0.6), 0 0 45px rgba(56, 189, 248, 0.22);
}

.cta-banner-box::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.14) 0%, transparent 60%);
  pointer-events: none;
}

.cta-banner-title {
  font-size: 2.6rem;
  font-weight: 800;
  margin-bottom: 18px;
  letter-spacing: -0.5px;
}

.cta-banner-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 680px;
  margin: 0 auto 36px auto;
  line-height: 1.7;
}

/* ===================================================================
   用户评价跑马灯区 (Testimonials Marquee Section)
=================================================================== */
.testimonials-section {
  padding: 90px 0;
  position: relative;
  overflow: hidden;
}

.marquee-container {
  width: 100%;
  overflow: hidden;
  position: relative;
  padding: 16px 0;
  mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.marquee-track {
  display: flex;
  gap: 24px;
  width: max-content;
  animation: scroll-marquee 40s linear infinite;
}

.marquee-track:hover {
  animation-play-state: paused;
}

@keyframes scroll-marquee {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.testimonial-card {
  width: 380px;
  background: linear-gradient(160deg, rgba(14, 22, 42, 0.8) 0%, rgba(8, 13, 26, 0.88) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 26px;
  flex-shrink: 0;
  transition: var(--transition);
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.testimonial-card:hover {
  border-color: var(--border-hover);
  background: linear-gradient(160deg, rgba(18, 28, 54, 0.9) 0%, rgba(10, 16, 32, 0.92) 100%);
  transform: translateY(-4px);
  box-shadow: 0 16px 35px rgba(0, 0, 0, 0.5), 0 0 20px rgba(56, 189, 248, 0.15);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}

.user-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 700;
  font-size: 1.05rem;
  box-shadow: 0 0 14px rgba(56, 189, 248, 0.4);
}

.user-meta .user-name {
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--text-main);
}

.user-meta .user-role {
  font-size: 0.8rem;
  color: var(--text-sub);
}

.star-rating {
  color: #f59e0b;
  font-size: 0.95rem;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.testimonial-text {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.65;
}

/* ===================================================================
   常见问题解答区 (FAQ Section)
=================================================================== */
.faq-section {
  padding: 90px 0;
  position: relative;
}

.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: linear-gradient(160deg, rgba(14, 22, 42, 0.78) 0%, rgba(8, 13, 26, 0.85) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: var(--transition);
  overflow: hidden;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.faq-item:hover {
  border-color: rgba(56, 189, 248, 0.35);
}

.faq-item[open] {
  border-color: #38bdf8;
  background: linear-gradient(160deg, rgba(18, 28, 54, 0.9) 0%, rgba(10, 16, 32, 0.95) 100%);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.45), 0 0 25px rgba(56, 189, 248, 0.18);
}

.faq-summary {
  list-style: none;
  padding: 22px 26px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-icon {
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--quantum-blue);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-icon {
  transform: rotate(180deg);
  color: #38bdf8;
}

.faq-content {
  padding: 0 26px 24px 26px;
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.75;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 4px;
  padding-top: 16px;
}

/* ===================================================================
   页脚 (Footer)
=================================================================== */
.footer {
  border-top: 1px solid var(--border-color);
  background: #04060c;
  padding: 50px 0 35px 0;
  margin-top: 40px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 26px;
}

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

.footer-nav-item {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-sub);
  position: relative;
  transition: var(--transition);
}

.footer-nav-item:hover {
  color: #ffffff;
  text-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
}

.footer-copy {
  font-size: 0.88rem;
  color: #64748b;
}

/* ===================================================================
   独立子页面通用样式
=================================================================== */
.subpage-hero {
  padding-top: 140px;
  padding-bottom: 50px;
  text-align: center;
  background: radial-gradient(circle at 50% 20%, rgba(56, 189, 248, 0.16) 0%, transparent 60%);
}

.subpage-content {
  padding: 40px 0 100px 0;
}

.content-article {
  background: linear-gradient(160deg, rgba(14, 22, 42, 0.85) 0%, rgba(8, 13, 26, 0.92) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 50px 48px;
  max-width: 900px;
  margin: 0 auto;
  line-height: 1.85;
  color: var(--text-muted);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.content-article h2 {
  font-size: 1.75rem;
  font-weight: 800;
  color: #ffffff;
  margin: 40px 0 16px 0;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.content-article h2:first-of-type {
  margin-top: 0;
}

.content-article h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #e2e8f0;
  margin: 24px 0 12px 0;
}

.content-article p {
  margin-bottom: 18px;
  font-size: 1rem;
}

.content-article ul, .content-article ol {
  margin: 16px 0 24px 24px;
}

.content-article li {
  margin-bottom: 10px;
}

.content-article strong {
  color: #ffffff;
}

.info-alert {
  background: rgba(56, 189, 248, 0.1);
  border-left: 4px solid var(--quantum-blue);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  color: #e0f2fe;
}

/* ===================================================================
   深度 SEO 资讯与文章专栏专有样式
=================================================================== */
.article-toc-box {
  background: linear-gradient(160deg, rgba(14, 22, 42, 0.82) 0%, rgba(8, 13, 26, 0.9) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px 30px;
  margin-bottom: 50px;
  backdrop-filter: blur(14px);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.article-toc-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-color);
}

.article-toc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 14px;
}

.toc-link-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.5;
  transition: var(--transition);
}

.toc-link-item:hover {
  background: rgba(56, 189, 248, 0.12);
  border-color: rgba(56, 189, 248, 0.4);
  color: #ffffff;
  transform: translateX(4px);
}

.toc-badge {
  flex-shrink: 0;
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 4px;
  margin-top: 2px;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.4);
}

.article-block {
  background: linear-gradient(160deg, rgba(14, 22, 42, 0.85) 0%, rgba(8, 13, 26, 0.92) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 48px 44px;
  margin-bottom: 60px;
  backdrop-filter: blur(14px);
  position: relative;
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.article-block:hover {
  border-color: rgba(56, 189, 248, 0.35);
  box-shadow: 0 24px 55px rgba(0, 0, 0, 0.65), 0 0 35px rgba(56, 189, 248, 0.16);
}

.article-meta-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 20px;
  font-size: 0.85rem;
  color: var(--text-sub);
}

.meta-tag {
  background: rgba(56, 189, 248, 0.14);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: #7dd3fc;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-weight: 700;
}

.article-h1 {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.35;
  color: #ffffff;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.article-lead {
  font-size: 1.08rem;
  color: #e2e8f0;
  background: rgba(255, 255, 255, 0.03);
  border-left: 4px solid var(--quantum-blue);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 30px;
  line-height: 1.8;
}

.article-content h2 {
  font-size: 1.55rem;
  font-weight: 800;
  color: #ffffff;
  margin: 36px 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  gap: 8px;
}

.article-content h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: #e2e8f0;
  margin: 24px 0 12px 0;
}

.article-content p {
  font-size: 1rem;
  color: var(--text-sub);
  line-height: 1.85;
  margin-bottom: 18px;
}

.article-content ul, .article-content ol {
  margin: 16px 0 24px 22px;
  color: var(--text-muted);
}

.article-content li {
  margin-bottom: 10px;
  line-height: 1.75;
}

.article-content strong {
  color: #ffffff;
}

/* 优质外链与内链高亮 */
.seo-external-link {
  color: #38bdf8;
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: var(--transition);
  padding: 0 2px;
}

.seo-external-link:hover {
  color: #ffffff;
  text-shadow: 0 0 12px rgba(56, 189, 248, 0.7);
}

.seo-internal-link {
  color: #7dd3fc;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: var(--transition);
  padding: 0 2px;
}

.seo-internal-link:hover {
  color: #ffffff;
  text-shadow: 0 0 12px rgba(56, 189, 248, 0.7);
}

/* 对比表格样式 */
.seo-table-container {
  overflow-x: auto;
  margin: 28px 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.seo-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  text-align: left;
}

.seo-table th {
  background: #0d1222;
  color: #f8fafc;
  padding: 14px 18px;
  font-weight: 700;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.seo-table td {
  padding: 13px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
}

.seo-table tr:hover td {
  background: rgba(56, 189, 248, 0.04);
}

.seo-table tr:last-child td {
  border-bottom: none;
}

.back-to-top-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: #64748b;
  margin-top: 24px;
  transition: var(--transition);
}

.back-to-top-btn:hover {
  color: var(--quantum-blue);
}

/* ===================================================================
   响应式媒体查询 (@media)
=================================================================== */
@media (max-width: 1024px) {
  .hero-title {
    font-size: 2.8rem;
  }
  
  .cards-grid-3,
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }
  
  .why-row {
    gap: 32px;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
    scroll-padding-top: 70px;
  }
  
  .navbar-inner {
    height: 68px;
  }
  
  .nav-menu {
    position: fixed;
    top: 68px;
    left: 0;
    width: 100%;
    background: rgba(6, 9, 19, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px 20px;
    gap: 18px;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.7);
    display: none;
  }
  
  .nav-menu.active {
    display: flex;
  }
  
  .nav-link {
    font-size: 1.05rem;
    width: 100%;
    text-align: center;
    padding: 10px 0;
  }
  
  .hamburger-btn {
    display: inline-flex;
  }
  
  .hero-section {
    padding-top: 130px;
    padding-bottom: 60px;
  }
  
  .hero-title {
    font-size: 2.2rem;
  }
  
  .hero-subtitle {
    font-size: 1.05rem;
  }
  
  .hero-cta-group {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-cta-group .btn {
    width: 100%;
  }
  
  .cards-grid-3,
  .streaming-ai-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .why-row,
  .why-row.reverse {
    grid-template-columns: 1fr;
    direction: ltr;
  }
  
  .section-title {
    font-size: 1.85rem;
  }
  
  .cta-banner-box {
    padding: 45px 22px;
  }
  
  .cta-banner-title {
    font-size: 2rem;
  }
  
  .content-article {
    padding: 30px 22px;
  }
  
  .article-block {
    padding: 30px 20px;
  }
  
  .article-h1 {
    font-size: 1.6rem;
  }
  
  .article-toc-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-links-only {
    gap: 20px;
  }
  
  .btn {
    min-height: 48px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.95rem;
  }
  
  .hero-trust-bar {
    gap: 16px;
    flex-direction: column;
    align-items: flex-start;
  }
  
  .testimonial-card {
    width: 300px;
  }
}