/* ==========================================================================
   梯子云 (Tiziyun) - 全球高阶网络加速旗舰落地页
   设计哲学：超现代极简科技美学 · 晶莹微光拟态 (Luminous Glassmorphism) · 极致高级感
   性能指标：100% 纯原生 CSS · 零第三方依赖 · 首屏极速秒开 · 全端响应式
   ========================================================================== */

:root {
  /* 高阶宇宙暗黑基底 */
  --bg-base: #030712;
  --bg-deep: #070d1d;
  --bg-surface: rgba(15, 23, 42, 0.68);
  --bg-surface-elevated: rgba(30, 41, 59, 0.72);
  --bg-surface-hover: rgba(30, 41, 59, 0.88);
  
  /* 品牌核心奢华光效 */
  --primary-cyan: #38bdf8;
  --primary-blue: #2563eb;
  --primary-indigo: #6366f1;
  --primary-purple: #a855f7;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  /* 高级渐变 */
  --gradient-metallic: linear-gradient(180deg, #ffffff 0%, #cbd5e1 55%, #64748b 100%);
  --gradient-neon: linear-gradient(135deg, #38bdf8 0%, #6366f1 50%, #c084fc 100%);
  --gradient-btn-primary: linear-gradient(135deg, #38bdf8 0%, #2563eb 55%, #4f46e5 100%);
  --gradient-card-highlight: linear-gradient(180deg, rgba(56, 189, 248, 0.12) 0%, rgba(15, 23, 42, 0.8) 100%);

  /* 极致微细高定边框 */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-highlight: rgba(255, 255, 255, 0.18);
  --border-glow-cyan: rgba(56, 189, 248, 0.4);
  --border-glow-purple: rgba(168, 85, 247, 0.4);

  /* 分层柔和光晕投影 (放弃粗笨黑块阴影，采用多层柔和漫反射) */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-card: 0 16px 40px -12px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  --shadow-card-hover: 0 24px 60px -15px rgba(0, 0, 0, 0.8), 0 0 30px -5px rgba(56, 189, 248, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.2);
  --shadow-btn-primary: 0 8px 25px -4px rgba(56, 189, 248, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.35);

  /* 细腻字体层级 */
  --text-main: #f8fafc;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   全局重置与底色
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-base);
  color: var(--text-main);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  line-height: 1.6;
  overflow-x: hidden;
  background-color: var(--bg-base);
  /* 梦幻宇宙深空微粒与多重放射微光 */
  background-image: 
    radial-gradient(circle at 50% -10%, rgba(56, 189, 248, 0.16) 0%, transparent 55%),
    radial-gradient(circle at 15% 35%, rgba(99, 102, 241, 0.10) 0%, transparent 45%),
    radial-gradient(circle at 85% 65%, rgba(168, 85, 247, 0.09) 0%, transparent 50%),
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 100% 100%, 48px 48px, 48px 48px;
  min-height: 100vh;
}

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

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

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

/* 容器与通用排版 */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 28px;
}

.text-gradient {
  background: var(--gradient-neon);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

/* 极具高级感的精修胶囊标签 */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.28);
  border-radius: var(--radius-full);
  color: var(--primary-cyan);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 18px;
  backdrop-filter: blur(8px);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.15);
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 65px;
}

.section-title {
  font-size: 2.6rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 18px;
  letter-spacing: -0.03em;
  color: #ffffff;
}

.section-desc {
  font-size: 1.12rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ==========================================================================
   高端流线型按钮规范 (High-End Buttons)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 28px;
  font-size: 0.98rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: var(--transition);
  white-space: nowrap;
  letter-spacing: 0.2px;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-btn-primary);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.3);
  box-shadow: var(--shadow-btn-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 35px -3px rgba(56, 189, 248, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.5);
  background: linear-gradient(135deg, #0ea5e9 0%, #1d4ed8 55%, #4338ca 100%);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-highlight);
  color: #ffffff;
  backdrop-filter: blur(16px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(56, 189, 248, 0.4);
  color: #ffffff;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4), 0 0 15px rgba(56, 189, 248, 0.2);
}

.btn-large {
  padding: 16px 38px;
  font-size: 1.1rem;
  font-weight: 700;
}

/* ==========================================================================
   导航栏 (Navbar) - 晶莹毛玻璃吸顶
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 18px 0;
  transition: var(--transition);
  background: rgba(3, 7, 18, 0.55);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

.navbar.scrolled {
  padding: 12px 0;
  background: rgba(7, 13, 29, 0.88);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* 品牌 Logo */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: #ffffff;
}

.brand-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(99, 102, 241, 0.2));
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-cyan);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.25);
  transition: var(--transition);
}

.brand-logo:hover .brand-icon {
  transform: scale(1.05);
  border-color: var(--primary-cyan);
  box-shadow: 0 0 25px rgba(56, 189, 248, 0.45);
}

.brand-name {
  background: linear-gradient(180deg, #ffffff 0%, #e2e8f0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-badge {
  font-size: 0.68rem;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.15);
  border: 1px solid rgba(56, 189, 248, 0.3);
  color: var(--primary-cyan);
  font-weight: 700;
  letter-spacing: 0.5px;
}

/* 导航链接 */
.nav-menu {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 34px;
}

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

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

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--gradient-neon);
  transition: width 0.25s ease;
  border-radius: 2px;
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-login-btn {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  transition: var(--transition);
}

.nav-login-btn:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.06);
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 26px;
  height: 18px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
}

/* ==========================================================================
   首屏横幅区 (Hero Section) - 震撼大气
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 180px 0 100px;
  text-align: center;
  overflow: hidden;
}

.hero-glow-sphere {
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 420px;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.22) 0%, rgba(99, 102, 241, 0.14) 45%, transparent 70%);
  filter: blur(75px);
  z-index: -1;
  pointer-events: none;
}

/* 呼吸微光促销药丸 */
.promo-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 22px;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-full);
  margin-bottom: 30px;
  box-shadow: 0 0 25px rgba(56, 189, 248, 0.2);
  backdrop-filter: blur(12px);
  transition: var(--transition);
}

.promo-pill:hover {
  border-color: var(--primary-cyan);
  box-shadow: 0 0 35px rgba(56, 189, 248, 0.35);
  transform: translateY(-1px);
}

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

@keyframes pulseBeacon {
  0%, 100% { transform: scale(1); opacity: 1; box-shadow: 0 0 10px var(--accent-emerald); }
  50% { transform: scale(1.3); opacity: 0.7; box-shadow: 0 0 18px var(--accent-emerald); }
}

.promo-text {
  font-size: 0.92rem;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 0.3px;
}

.promo-badge-tag {
  background: linear-gradient(135deg, #f59e0b, #ef4444);
  color: #ffffff;
  font-size: 0.72rem;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-weight: 800;
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.35);
}

.hero-title {
  font-size: 3.9rem;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.04em;
  margin-bottom: 24px;
  color: #ffffff;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 800px;
  margin: 0 auto 44px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 55px;
}

/* 信任指标 HUD 卡片条 */
.hero-stats-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  padding-top: 36px;
  border-top: 1px solid var(--border-subtle);
  max-width: 900px;
  margin: 0 auto;
  flex-wrap: wrap;
}

.hero-stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px 24px;
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  min-width: 170px;
  transition: var(--transition);
}

.hero-stat-item:hover {
  border-color: rgba(56, 189, 248, 0.3);
  background: rgba(255, 255, 255, 0.04);
  transform: translateY(-2px);
}

.stat-number {
  font-size: 1.75rem;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-tertiary);
  font-weight: 500;
  margin-top: 2px;
}

/* ==========================================================================
   核心优势图卡区 (Dynamic Cards Section) - 玻璃微光卡片
   ========================================================================== */
.features-section {
  padding: 105px 0;
  position: relative;
}

.feature-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-bottom: 40px;
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 38px 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card);
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-neon);
  opacity: 0;
  transition: var(--transition);
}

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

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

.card-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-cyan);
  margin-bottom: 24px;
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.15);
}

.card-icon-wrapper.purple {
  background: rgba(168, 85, 247, 0.1);
  border-color: rgba(168, 85, 247, 0.25);
  color: var(--primary-purple);
  box-shadow: 0 0 20px rgba(168, 85, 247, 0.15);
}

.card-icon-wrapper.green {
  background: rgba(16, 185, 129, 0.1);
  border-color: rgba(16, 185, 129, 0.25);
  color: var(--accent-emerald);
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.15);
}

.card-title {
  font-size: 1.38rem;
  font-weight: 700;
  margin-bottom: 14px;
  color: #ffffff;
  letter-spacing: -0.01em;
}

.card-desc {
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 流媒体与 AI 支持大卡 */
.support-banner-card {
  background: linear-gradient(135deg, rgba(15, 23, 42, 0.85) 0%, rgba(30, 27, 75, 0.7) 100%);
  border: 1px solid rgba(99, 102, 241, 0.35);
  border-radius: var(--radius-xl);
  padding: 44px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  backdrop-filter: blur(20px);
  box-shadow: 0 20px 50px -10px rgba(0, 0, 0, 0.6);
}

.support-content {
  flex: 1.25;
}

.support-pill {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid rgba(168, 85, 247, 0.35);
  color: #d8b4fe;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  margin-bottom: 14px;
  letter-spacing: 0.8px;
}

.support-title {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 14px;
  color: #ffffff;
  letter-spacing: -0.02em;
}

.support-desc {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.support-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.service-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: 0.86rem;
  font-weight: 600;
  color: #e2e8f0;
  transition: var(--transition);
}

.service-tag:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(56, 189, 248, 0.35);
  color: #ffffff;
}

.service-tag .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
}

.support-visual-grid {
  flex: 0.75;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.support-badge-box {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 18px;
  text-align: center;
  backdrop-filter: blur(10px);
}

.badge-metric {
  font-size: 1.55rem;
  font-weight: 800;
  color: var(--primary-cyan);
  margin-bottom: 4px;
}

.badge-label {
  font-size: 0.82rem;
  color: var(--text-tertiary);
  font-weight: 500;
}

/* ==========================================================================
   定价卡片区 (Pricing Section) - 奢华高转化三列网格
   ========================================================================== */
.pricing-section {
  padding: 105px 0;
  position: relative;
}

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

.pricing-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 42px 34px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card);
}

.pricing-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-highlight);
  box-shadow: var(--shadow-card-hover);
}

/* 核心推荐卡片 (VIP2 高光高质感) */
.pricing-card.featured {
  border: 1px solid rgba(56, 189, 248, 0.6);
  background: linear-gradient(180deg, rgba(20, 30, 55, 0.85) 0%, rgba(15, 23, 42, 0.9) 100%);
  box-shadow: 0 0 50px -10px rgba(56, 189, 248, 0.35), 0 20px 45px rgba(0, 0, 0, 0.6);
  transform: scale(1.03);
}

.pricing-card.featured:hover {
  transform: scale(1.03) translateY(-8px);
  box-shadow: 0 0 65px -8px rgba(56, 189, 248, 0.5), 0 30px 60px rgba(0, 0, 0, 0.8);
}

.featured-ribbon {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-btn-primary);
  color: #ffffff;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 5px 22px;
  border-radius: var(--radius-full);
  letter-spacing: 0.5px;
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.plan-header {
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 24px;
}

.plan-tier {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary-cyan);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.plan-cycle {
  font-size: 0.8rem;
  padding: 3px 10px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-weight: 600;
}

.plan-price-wrapper {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin: 16px 0 12px;
}

.currency {
  font-size: 1.6rem;
  font-weight: 700;
  color: #ffffff;
}

.price-amount {
  font-size: 3.5rem;
  font-weight: 900;
  color: #ffffff;
  line-height: 1;
  letter-spacing: -0.03em;
}

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

.plan-traffic {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  background: rgba(56, 189, 248, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-sm);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.95rem;
}

.plan-features {
  list-style: none;
  margin-bottom: 34px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.94rem;
  color: var(--text-secondary);
}

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

.plan-cta {
  width: 100%;
}

/* ==========================================================================
   深度特性解析区 (Why Choose Section) - 仪表盘与极客终端
   ========================================================================== */
.why-section {
  padding: 105px 0;
  position: relative;
}

.why-row {
  display: flex;
  align-items: center;
  gap: 65px;
  margin-bottom: 90px;
}

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

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

.why-content {
  flex: 1;
}

.why-visual {
  flex: 1;
}

.why-content .section-title {
  font-size: 2.3rem;
  text-align: left;
}

.why-content p {
  color: var(--text-secondary);
  font-size: 1.08rem;
  line-height: 1.75;
  margin-bottom: 24px;
}

.why-highlights {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.why-highlights li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.98rem;
  color: #e2e8f0;
}

.why-highlights svg {
  color: var(--primary-cyan);
  flex-shrink: 0;
}

/* 云监控实时面板 */
.data-monitor-panel {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-highlight);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(20px);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 16px;
}

.panel-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 10px;
}

.live-indicator {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  color: var(--accent-emerald);
  font-weight: 700;
  background: rgba(16, 185, 129, 0.12);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.pulse-dot {
  width: 7px;
  height: 7px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  animation: pulseBeacon 2s infinite;
}

.speed-metric-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 22px;
}

.metric-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px 18px;
}

.metric-num {
  font-size: 1.65rem;
  font-weight: 800;
  color: #ffffff;
  letter-spacing: -0.02em;
}

.metric-desc {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-top: 2px;
}

.progress-bar-wrapper {
  margin-top: 14px;
}

.progress-bar-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.progress-bar-track {
  width: 100%;
  height: 8px;
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  width: 28.4%;
  background: linear-gradient(90deg, var(--primary-cyan), var(--accent-emerald));
  border-radius: var(--radius-full);
}

/* 极客 macOS 风格终端代码块 */
.terminal-window {
  background: #090d16;
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.7);
  font-family: var(--font-mono);
}

.terminal-header {
  background: rgba(255, 255, 255, 0.04);
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.terminal-dots {
  display: flex;
  gap: 8px;
}

.dot-red { width: 12px; height: 12px; border-radius: 50%; background: #ef4444; }
.dot-yellow { width: 12px; height: 12px; border-radius: 50%; background: #f59e0b; }
.dot-green { width: 12px; height: 12px; border-radius: 50%; background: #10b981; }

.terminal-filename {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.terminal-body {
  padding: 26px;
  font-size: 0.88rem;
  line-height: 1.75;
  color: #cbd5e1;
}

.t-comment { color: #64748b; }
.t-cmd { color: var(--primary-cyan); font-weight: 600; }
.t-success { color: var(--accent-emerald); font-weight: 600; }
.t-keyword { color: var(--primary-purple); }
.t-var { color: #fbbf24; }
.t-cursor {
  display: inline-block;
  width: 8px;
  height: 15px;
  background: var(--primary-cyan);
  vertical-align: middle;
  animation: blinkCursor 1s infinite;
}

@keyframes blinkCursor {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

/* ==========================================================================
   用户评价跑马灯区 (Testimonials Marquee Section)
   ========================================================================== */
.testimonials-section {
  padding: 105px 0;
  position: relative;
  overflow: hidden;
}

.marquee-container {
  width: 100%;
  overflow: hidden;
  position: relative;
  mask-image: linear-gradient(to right, transparent, black 12%, black 88%, transparent);
  -webkit-mask-image: linear-gradient(to right, transparent, black 12%, black 88%, transparent);
}

.marquee-track {
  display: flex;
  gap: 24px;
  width: max-content;
  animation: marqueeScroll 45s linear infinite;
}

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

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

.review-card {
  width: 370px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 26px;
  flex-shrink: 0;
  transition: var(--transition);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm);
}

.review-card:hover {
  border-color: rgba(56, 189, 248, 0.4);
  transform: translateY(-4px);
  background: var(--bg-surface-hover);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
}

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

.reviewer-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.3), rgba(99, 102, 241, 0.3));
  border: 1px solid rgba(56, 189, 248, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #ffffff;
  font-size: 0.95rem;
}

.reviewer-info {
  flex: 1;
}

.reviewer-name {
  font-size: 0.98rem;
  font-weight: 700;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 6px;
}

.verified-tag {
  color: var(--primary-cyan);
  width: 15px;
  height: 15px;
}

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

.star-rating {
  display: flex;
  gap: 3px;
  color: var(--accent-amber);
  margin-bottom: 12px;
  font-size: 0.95rem;
}

.review-text {
  font-size: 0.94rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ==========================================================================
   常见问题解答区 (FAQ Section)
   ========================================================================== */
.faq-section {
  padding: 105px 0;
  position: relative;
}

.faq-container {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-item:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.faq-item[open] {
  border-color: rgba(56, 189, 248, 0.4);
  background: rgba(18, 26, 46, 0.85);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.faq-summary {
  padding: 22px 26px;
  font-size: 1.08rem;
  font-weight: 600;
  color: #ffffff;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

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

.faq-chevron {
  width: 20px;
  height: 20px;
  color: var(--text-tertiary);
  transition: transform 0.25s ease, color 0.25s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
  color: var(--primary-cyan);
}

.faq-answer {
  padding: 0 26px 24px 26px;
  font-size: 0.98rem;
  color: var(--text-secondary);
  line-height: 1.75;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 16px;
}

/* ==========================================================================
   底部转化区 (CTA Section)
   ========================================================================== */
.cta-banner-section {
  padding: 85px 0 110px;
  position: relative;
}

.cta-box {
  background: radial-gradient(circle at 50% -20%, rgba(56, 189, 248, 0.25) 0%, rgba(15, 23, 42, 0.95) 70%),
              #070d1d;
  border: 1px solid rgba(56, 189, 248, 0.4);
  border-radius: var(--radius-xl);
  padding: 65px 45px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.7), 0 0 50px rgba(56, 189, 248, 0.2);
}

.cta-box .section-title {
  margin-bottom: 18px;
}

.cta-box p {
  font-size: 1.18rem;
  color: var(--text-secondary);
  max-width: 660px;
  margin: 0 auto 38px;
}

/* ==========================================================================
   页脚 (Footer)
   ========================================================================== */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 55px 0 45px;
  background: #02050c;
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 45px;
  margin-bottom: 26px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition);
}

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

.footer-bottom {
  text-align: center;
  font-size: 0.86rem;
  color: var(--text-tertiary);
}

/* ==========================================================================
   通用子页面专用样式 (About, Terms, Privacy, Sitemap)
   ========================================================================== */
.subpage-hero {
  padding: 150px 0 65px;
  text-align: center;
  border-bottom: 1px solid var(--border-subtle);
  background: radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.12) 0%, transparent 65%);
}

.subpage-body {
  padding: 65px 0 110px;
}

.doc-content {
  max-width: 880px;
  margin: 0 auto;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 52px;
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-card);
}

.doc-content h2 {
  font-size: 1.65rem;
  font-weight: 700;
  color: #ffffff;
  margin: 34px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.doc-content h2:first-child {
  margin-top: 0;
}

.doc-content p, .doc-content li {
  font-size: 1.02rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 16px;
}

.doc-content ul {
  padding-left: 24px;
  margin-bottom: 22px;
}

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

.sitemap-card {
  background: rgba(255, 255, 255, 0.025);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 26px;
  transition: var(--transition);
}

.sitemap-card:hover {
  border-color: rgba(56, 189, 248, 0.3);
  background: rgba(255, 255, 255, 0.04);
}

.sitemap-card h3 {
  font-size: 1.22rem;
  color: var(--primary-cyan);
  margin-bottom: 16px;
}

.sitemap-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sitemap-list a {
  color: var(--text-secondary);
  font-size: 0.96rem;
}

.sitemap-list a:hover {
  color: #ffffff;
  padding-left: 6px;
}

/* ==========================================================================
   推荐资讯与万字深度 SEO 文章页面专用样式
   ========================================================================== */
.articles-page-wrapper {
  padding: 140px 0 110px;
}

.articles-grid-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 45px;
  align-items: start;
}

.articles-sidebar {
  position: sticky;
  top: 95px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 28px;
  backdrop-filter: blur(20px);
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  box-shadow: var(--shadow-sm);
}

.toc-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-subtle);
}

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

.toc-link {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
  display: block;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
  transition: var(--transition);
}

.toc-link:hover, .toc-link.active {
  color: var(--primary-cyan);
  background: rgba(56, 189, 248, 0.08);
  border-left-color: var(--primary-cyan);
}

.articles-stream {
  display: flex;
  flex-direction: column;
  gap: 65px;
}

.seo-article-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 48px;
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.seo-article-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--gradient-neon);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.86rem;
  color: var(--text-tertiary);
  margin-bottom: 18px;
  flex-wrap: wrap;
}

.article-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.28);
  border-radius: var(--radius-full);
  color: var(--primary-cyan);
  font-size: 0.8rem;
  font-weight: 700;
}

.article-title {
  font-size: 1.95rem;
  font-weight: 800;
  color: #ffffff;
  line-height: 1.35;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.article-body {
  color: var(--text-secondary);
  font-size: 1.04rem;
  line-height: 1.9;
}

.article-body h2 {
  font-size: 1.45rem;
  color: #ffffff;
  margin: 38px 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  gap: 12px;
}

.article-body h3 {
  font-size: 1.2rem;
  color: #e2e8f0;
  margin: 26px 0 14px;
}

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

.article-body ul, .article-body ol {
  padding-left: 24px;
  margin-bottom: 22px;
}

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

.internal-link {
  color: var(--primary-cyan);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: var(--transition);
}

.internal-link:hover {
  color: #ffffff;
  text-shadow: 0 0 12px rgba(56, 189, 248, 0.6);
}

.callout-box {
  background: rgba(56, 189, 248, 0.06);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin: 26px 0;
  color: #e2e8f0;
}

.callout-box.highlight {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.35);
}

.article-table-wrapper {
  overflow-x: auto;
  margin: 26px 0;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94rem;
  text-align: left;
}

.data-table th, .data-table td {
  padding: 14px 18px;
  border: 1px solid var(--border-subtle);
}

.data-table th {
  background: rgba(255, 255, 255, 0.04);
  color: #ffffff;
  font-weight: 700;
}

.data-table td {
  color: var(--text-secondary);
}

.data-table tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

.code-snippet {
  background: #090d16;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  padding: 18px 22px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--primary-cyan);
  overflow-x: auto;
  margin: 22px 0;
}

.article-inline-cta {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.12) 0%, rgba(99, 102, 241, 0.1) 100%);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 36px 0;
  flex-wrap: wrap;
  gap: 18px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.inline-cta-text h4 {
  font-size: 1.18rem;
  color: #ffffff;
  margin-bottom: 4px;
}

.inline-cta-text p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* ==========================================================================
   响应式媒体查询 (Responsive Design @media)
   ========================================================================== */
@media (max-width: 992px) {
  .hero-title {
    font-size: 3.1rem;
  }
  
  .feature-cards-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 540px;
    margin-left: auto;
    margin-right: auto;
  }

  .pricing-card.featured {
    transform: none;
  }

  .pricing-card.featured:hover {
    transform: translateY(-8px);
  }

  .support-banner-card {
    flex-direction: column;
    text-align: center;
    padding: 36px 28px;
  }

  .support-tags {
    justify-content: center;
  }

  .support-visual-grid {
    width: 100%;
  }

  .why-row, .why-row.reverse {
    flex-direction: column;
    gap: 45px;
  }

  .why-content .section-title {
    text-align: center;
  }

  .why-content p {
    text-align: center;
  }

  .why-highlights {
    max-width: 500px;
    margin: 0 auto;
  }

  .articles-grid-layout {
    grid-template-columns: 1fr;
  }

  .articles-sidebar {
    position: static;
    max-height: none;
  }
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: rgba(7, 13, 29, 0.98);
    backdrop-filter: blur(24px);
    flex-direction: column;
    align-items: center;
    gap: 22px;
    padding: 34px 0;
    border-bottom: 1px solid var(--border-highlight);
    box-shadow: 0 20px 45px rgba(0, 0, 0, 0.7);
    transform: translateY(-150%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    opacity: 0;
    pointer-events: none;
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-actions .nav-login-btn {
    display: none;
  }

  .hero-section {
    padding: 135px 0 65px;
  }

  .hero-title {
    font-size: 2.3rem;
    letter-spacing: -0.03em;
  }

  .hero-subtitle {
    font-size: 1.08rem;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
    max-width: 320px;
    min-height: 52px;
  }

  .hero-stats-row {
    gap: 16px;
  }

  .hero-stat-item {
    width: 100%;
    max-width: 320px;
  }

  .section-title {
    font-size: 2rem;
  }

  .cta-box {
    padding: 42px 22px;
  }

  .cta-box .btn-large {
    width: 100%;
    max-width: 320px;
  }

  .footer-nav {
    flex-direction: column;
    gap: 20px;
  }

  .doc-content {
    padding: 30px 22px;
  }

  .seo-article-card {
    padding: 32px 22px;
  }

  .sitemap-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .stat-number {
    font-size: 1.45rem;
  }

  .price-amount {
    font-size: 2.8rem;
  }

  .review-card {
    width: 300px;
  }
}