/* ============================================
   隐云 - 主样式文件
   主题：白蓝色 / 动感科技风
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');

/* ---- CSS 变量 ---- */
:root {
  --primary: #1a6ef5;
  --primary-dark: #0f4fc4;
  --primary-light: #4a90f8;
  --primary-ultra-light: #e8f1ff;
  --accent: #00c6ff;
  --accent2: #38bdf8;
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --gradient-main: linear-gradient(135deg, #1a6ef5 0%, #00c6ff 100%);
  --gradient-hero: linear-gradient(160deg, #e8f1ff 0%, #f0f8ff 40%, #ffffff 100%);
  --gradient-card: linear-gradient(135deg, rgba(255,255,255,0.9) 0%, rgba(232,241,255,0.6) 100%);
  --shadow-sm: 0 2px 8px rgba(26,110,245,0.08);
  --shadow-md: 0 8px 24px rgba(26,110,245,0.12);
  --shadow-lg: 0 20px 60px rgba(26,110,245,0.15);
  --shadow-xl: 0 30px 80px rgba(26,110,245,0.2);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-main: 'Inter', 'Noto Sans SC', sans-serif;
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-main);
  background: var(--white);
  color: var(--gray-800);
  line-height: 1.6;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button { border: none; outline: none; cursor: pointer; font-family: var(--font-main); }

/* ---- Scrollbar ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--gray-100); }
::-webkit-scrollbar-thumb { background: var(--primary-light); border-radius: 3px; }

/* ============================================
   动态背景粒子
   ============================================ */
#particles-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0 2rem;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(26,110,245,0.08);
  transition: var(--transition);
}
.navbar.scrolled {
  height: 64px;
  box-shadow: var(--shadow-md);
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.5px;
}
.nav-logo .logo-icon {
  width: 40px; height: 40px;
  background: var(--gradient-main);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
  box-shadow: 0 4px 12px rgba(26,110,245,0.3);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.nav-links a {
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  color: var(--gray-700);
  font-size: 0.88rem;
  font-weight: 500;
  transition: var(--transition);
  white-space: nowrap;
}
.nav-links a:hover {
  background: var(--primary-ultra-light);
  color: var(--primary);
}
.nav-cta {
  background: var(--gradient-main) !important;
  color: white !important;
  padding: 0.5rem 1.2rem !important;
  border-radius: var(--radius-full) !important;
  font-weight: 600 !important;
  box-shadow: 0 4px 12px rgba(26,110,245,0.3);
}
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26,110,245,0.4) !important;
  background: var(--gradient-main) !important;
}
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}
.hamburger span {
  width: 24px; height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transition: var(--transition);
}
.mobile-menu {
  display: none;
  position: fixed;
  top: 72px; left: 0; right: 0;
  background: rgba(255,255,255,0.98);
  backdrop-filter: blur(20px);
  padding: 1rem 2rem 2rem;
  border-bottom: 1px solid var(--gray-200);
  z-index: 999;
  flex-direction: column;
  gap: 0.5rem;
}
.mobile-menu.active { display: flex; }
.mobile-menu a {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  color: var(--gray-700);
  font-weight: 500;
  border-bottom: 1px solid var(--gray-100);
  transition: var(--transition);
}
.mobile-menu a:hover { background: var(--primary-ultra-light); color: var(--primary); }

/* ============================================
   英雄区 Hero
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 100px 2rem 80px;
  background: var(--gradient-hero);
  overflow: hidden;
  z-index: 1;
}
.hero-bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}
.hero-bg-orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(26,110,245,0.15) 0%, transparent 70%);
  top: -100px; right: -100px;
  animation: orbFloat 8s ease-in-out infinite;
}
.hero-bg-orb-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(0,198,255,0.12) 0%, transparent 70%);
  bottom: -50px; left: -80px;
  animation: orbFloat 10s ease-in-out infinite reverse;
}
.hero-bg-orb-3 {
  width: 300px; height: 300px;
  background: radial-gradient(circle, rgba(26,110,245,0.1) 0%, transparent 70%);
  top: 40%; left: 40%;
  animation: orbFloat 12s ease-in-out infinite;
}
@keyframes orbFloat {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -20px) scale(1.05); }
  66% { transform: translate(-20px, 30px) scale(0.95); }
}
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 2;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(26,110,245,0.1);
  border: 1px solid rgba(26,110,245,0.2);
  border-radius: var(--radius-full);
  padding: 6px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 1.5rem;
  animation: fadeInDown 0.8s ease both;
}
.hero-badge .dot {
  width: 8px; height: 8px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 2s ease infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.5); opacity: 0.7; }
}
.hero-title {
  font-size: clamp(2.2rem, 4vw, 3.8rem);
  font-weight: 900;
  line-height: 1.15;
  color: var(--gray-900);
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.8s ease 0.1s both;
}
.hero-title .highlight {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.05rem;
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: 2.5rem;
  animation: fadeInUp 0.8s ease 0.2s both;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.3s both;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.9rem 2rem;
  background: var(--gradient-main);
  color: white;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 1rem;
  box-shadow: 0 8px 24px rgba(26,110,245,0.35);
  transition: var(--transition);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(26,110,245,0.45);
}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.9rem 2rem;
  background: white;
  color: var(--primary);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  border: 2px solid rgba(26,110,245,0.2);
  transition: var(--transition);
}
.btn-secondary:hover {
  background: var(--primary-ultra-light);
  border-color: var(--primary);
  transform: translateY(-2px);
}
.hero-stats {
  display: flex;
  gap: 2rem;
  margin-top: 3rem;
  animation: fadeInUp 0.8s ease 0.4s both;
}
.stat-item { text-align: center; }
.stat-num {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--primary);
}
.stat-label {
  font-size: 0.78rem;
  color: var(--gray-500, #6b7280);
  margin-top: 2px;
}
.hero-visual {
  position: relative;
  animation: fadeInRight 1s ease 0.2s both;
}
.hero-card-main {
  background: white;
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(26,110,245,0.08);
  position: relative;
  overflow: hidden;
}
.hero-card-main::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: var(--gradient-main);
}
.speed-display {
  text-align: center;
  padding: 1.5rem 0;
}
.speed-circle {
  width: 140px; height: 140px;
  border-radius: 50%;
  background: var(--gradient-hero);
  border: 4px solid transparent;
  background-clip: padding-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  position: relative;
  box-shadow: 0 0 0 8px rgba(26,110,245,0.08), inset 0 0 30px rgba(26,110,245,0.05);
}
.speed-circle::after {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  background: conic-gradient(from 0deg, var(--primary) 0%, var(--accent) 75%, transparent 75%);
  z-index: -1;
  animation: spin 3s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.speed-num {
  font-size: 2rem;
  font-weight: 900;
  color: var(--primary);
}
.speed-unit { font-size: 0.75rem; color: var(--gray-400); }
.speed-label { color: var(--gray-600); font-size: 0.9rem; margin-top: 0.5rem; font-weight: 500; }
.node-list { margin-top: 1.5rem; display: flex; flex-direction: column; gap: 0.75rem; }
.node-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 0.75rem;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}
.node-flag { font-size: 1.1rem; margin-right: 6px; }
.node-name { flex: 1; font-weight: 500; color: var(--gray-700); }
.node-latency {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 20px;
}
.latency-good { background: rgba(16,185,129,0.1); color: var(--success); }
.latency-mid { background: rgba(245,158,11,0.1); color: var(--warning); }
.node-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  margin-left: 8px;
}
.dot-green { background: var(--success); animation: pulse 2s ease infinite; }
.dot-orange { background: var(--warning); animation: pulse 2s ease infinite 0.5s; }
.float-card {
  position: absolute;
  background: white;
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--gray-200);
  animation: floatCard 4s ease-in-out infinite;
  font-size: 0.8rem;
  font-weight: 500;
}
.float-card-1 { top: -20px; right: -30px; animation-delay: 0s; }
.float-card-2 { bottom: 60px; left: -40px; animation-delay: 2s; }
.float-card .fc-label { color: var(--gray-400); font-size: 0.72rem; }
.float-card .fc-value { color: var(--primary); font-weight: 700; font-size: 1rem; }
@keyframes floatCard {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* ============================================
   通用 Section 样式
   ============================================ */
section { position: relative; z-index: 1; }
.section-header {
  text-align: center;
  margin-bottom: 4rem;
}
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-ultra-light);
  color: var(--primary);
  border-radius: var(--radius-full);
  padding: 6px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 1rem;
}
.section-title {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 800;
  color: var(--gray-900);
  line-height: 1.2;
  margin-bottom: 1rem;
}
.section-title .highlight {
  background: var(--gradient-main);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-subtitle {
  font-size: 1rem;
  color: var(--gray-600);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ============================================
   核心优势板块
   ============================================ */
.features {
  padding: 100px 2rem;
  background: var(--white);
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.feature-card {
  background: var(--gradient-card);
  border: 1px solid rgba(26,110,245,0.1);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  cursor: default;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 0;
  background: var(--gradient-main);
  transition: height 0.3s ease;
  opacity: 0.05;
}
.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(26,110,245,0.25);
}
.feature-card:hover::before { height: 100%; }
.feature-icon {
  width: 60px; height: 60px;
  border-radius: var(--radius-md);
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 1.25rem;
  box-shadow: 0 8px 20px rgba(26,110,245,0.25);
  transition: var(--transition);
}
.feature-card:hover .feature-icon {
  transform: scale(1.1) rotate(5deg);
}
.feature-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 0.75rem;
}
.feature-desc {
  font-size: 0.9rem;
  color: var(--gray-600);
  line-height: 1.7;
}
.feature-stat {
  margin-top: 1rem;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
}

/* ============================================
   节点状态板块
   ============================================ */
.nodes {
  padding: 100px 2rem;
  background: linear-gradient(180deg, var(--gray-50) 0%, var(--white) 100%);
}
.nodes-summary {
  display: flex;
  gap: 2rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}
.node-summary-card {
  text-align: center;
  background: white;
  border-radius: var(--radius-md);
  padding: 1.5rem 2.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  min-width: 150px;
}
.node-summary-num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
}
.node-summary-label {
  font-size: 0.82rem;
  color: var(--gray-500, #6b7280);
  margin-top: 4px;
}
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
.node-card {
  background: white;
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.node-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(26,110,245,0.2);
}
.node-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
}
.node-emoji { font-size: 1.8rem; }
.node-info { flex: 1; }
.node-region { font-size: 0.9rem; font-weight: 700; color: var(--gray-800); }
.node-type { font-size: 0.75rem; color: var(--gray-400); margin-top: 2px; }
.node-status-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
}
.status-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.status-online { background: var(--success); animation: pulse 2.5s ease infinite; }
.status-busy { background: var(--warning); animation: pulse 2.5s ease infinite 0.5s; }
.node-ping-bar {
  height: 4px;
  background: var(--gray-100);
  border-radius: 2px;
  overflow: hidden;
}
.node-ping-fill {
  height: 100%;
  border-radius: 2px;
  background: var(--gradient-main);
  animation: fillBar 1.5s ease forwards;
}
@keyframes fillBar {
  from { width: 0; }
}
.node-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.78rem;
}
.node-ms { font-weight: 700; }
.ms-good { color: var(--success); }
.ms-mid { color: var(--warning); }
.node-uptime { color: var(--gray-400); }

/* ============================================
   套餐价格板块
   ============================================ */
.pricing {
  padding: 100px 2rem;
  background: linear-gradient(180deg, var(--white) 0%, var(--primary-ultra-light) 50%, var(--white) 100%);
}
.pricing-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
}
.toggle-label { font-size: 0.9rem; font-weight: 500; color: var(--gray-600); }
.toggle-switch {
  width: 52px; height: 28px;
  background: var(--gray-200);
  border-radius: 14px;
  position: relative;
  cursor: pointer;
  transition: var(--transition);
}
.toggle-switch.active { background: var(--primary); }
.toggle-switch::after {
  content: '';
  position: absolute;
  top: 3px; left: 3px;
  width: 22px; height: 22px;
  background: white;
  border-radius: 50%;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}
.toggle-switch.active::after { left: 27px; }
.save-badge {
  background: var(--success);
  color: white;
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: var(--radius-full);
}
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  max-width: 1000px;
  margin: 0 auto;
}
.price-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 2rem;
  border: 2px solid var(--gray-200);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.price-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}
.price-card.popular {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: scale(1.03);
}
.price-card.popular:hover { transform: scale(1.03) translateY(-8px); }
.popular-badge {
  position: absolute;
  top: 0; left: 0; right: 0;
  background: var(--gradient-main);
  color: white;
  text-align: center;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 6px;
  letter-spacing: 0.05em;
}
.price-card.popular .price-content { margin-top: 2rem; }
.price-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--gray-800);
  margin-bottom: 0.5rem;
}
.price-amount {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  margin: 1.25rem 0;
}
.price-currency { font-size: 1.2rem; font-weight: 600; color: var(--primary); line-height: 1; margin-bottom: 4px; }
.price-num { font-size: 3rem; font-weight: 900; color: var(--primary); line-height: 1; }
.price-period { font-size: 0.85rem; color: var(--gray-400); margin-bottom: 6px; }
.price-original {
  font-size: 0.85rem;
  color: var(--gray-400);
  text-decoration: line-through;
  margin-bottom: 1rem;
}
.price-features {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin: 1.5rem 0;
}
.price-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--gray-700);
}
.price-feature .check {
  width: 18px; height: 18px;
  background: rgba(16,185,129,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--success);
  font-size: 0.7rem;
  flex-shrink: 0;
}
.btn-price {
  width: 100%;
  padding: 0.85rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.95rem;
  transition: var(--transition);
  text-align: center;
  display: block;
}
.btn-price-outline {
  background: white;
  color: var(--primary);
  border: 2px solid rgba(26,110,245,0.3);
}
.btn-price-outline:hover {
  background: var(--primary-ultra-light);
  border-color: var(--primary);
}
.btn-price-filled {
  background: var(--gradient-main);
  color: white;
  border: none;
  box-shadow: 0 6px 20px rgba(26,110,245,0.3);
}
.btn-price-filled:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 28px rgba(26,110,245,0.4);
}

/* ============================================
   用户评价板块
   ============================================ */
.reviews {
  padding: 100px 2rem;
  background: var(--white);
  overflow: hidden;
}
.reviews-ticker {
  display: flex;
  gap: 1.5rem;
  animation: scrollReviews 40s linear infinite;
  width: max-content;
}
.reviews-ticker:hover { animation-play-state: paused; }
.reviews-track { overflow: hidden; }
@keyframes scrollReviews {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}
.review-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  border: 1px solid var(--gray-200);
  width: 320px;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.review-card:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(26,110,245,0.2);
}
.review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 1rem;
}
.review-avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 700;
  color: white;
}
.review-name { font-weight: 700; color: var(--gray-800); font-size: 0.95rem; }
.review-date { font-size: 0.75rem; color: var(--gray-400); margin-top: 2px; }
.review-stars { color: #f59e0b; font-size: 0.9rem; letter-spacing: 1px; }
.review-tag {
  font-size: 0.72rem;
  background: var(--primary-ultra-light);
  color: var(--primary);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-weight: 600;
}
.review-text {
  font-size: 0.9rem;
  color: var(--gray-600);
  line-height: 1.7;
  margin-top: 0.75rem;
}
.review-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--gray-100);
}

/* ============================================
   常见问题板块
   ============================================ */
.faq {
  padding: 100px 2rem;
  background: var(--gray-50);
}
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.faq-item {
  background: white;
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item.open { border-color: rgba(26,110,245,0.25); box-shadow: var(--shadow-sm); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  gap: 1rem;
  user-select: none;
}
.faq-q-text {
  font-weight: 600;
  color: var(--gray-800);
  font-size: 0.95rem;
  flex: 1;
}
.faq-item.open .faq-q-text { color: var(--primary); }
.faq-icon {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
  font-size: 0.8rem;
  color: var(--gray-600);
}
.faq-item.open .faq-icon {
  background: var(--primary);
  color: white;
  transform: rotate(45deg);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.faq-answer-inner {
  padding: 0 1.5rem 1.25rem;
  font-size: 0.9rem;
  color: var(--gray-600);
  line-height: 1.8;
}

/* ============================================
   知识库与教程板块
   ============================================ */
.articles {
  padding: 100px 2rem;
  background: var(--white);
}
.articles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
}
.article-card {
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(26,110,245,0.1);
  transition: var(--transition);
  cursor: pointer;
}
.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(26,110,245,0.25);
}
.article-cover {
  height: 140px;
  background: var(--gradient-main);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  position: relative;
  overflow: hidden;
}
.article-cover::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 60%);
}
.article-body { padding: 1.25rem; }
.article-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-ultra-light);
  padding: 3px 10px;
  border-radius: var(--radius-full);
  margin-bottom: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.article-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--gray-800);
  line-height: 1.4;
  margin-bottom: 0.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.article-excerpt {
  font-size: 0.8rem;
  color: var(--gray-500, #6b7280);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 1rem;
}
.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--gray-400);
}
.article-read-more {
  color: var(--primary);
  font-weight: 600;
  font-size: 0.78rem;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ============================================
   CTA Banner
   ============================================ */
.cta-banner {
  padding: 80px 2rem;
  background: var(--gradient-main);
  position: relative;
  overflow: hidden;
  text-align: center;
}
.cta-banner::before {
  content: '';
  position: absolute;
  top: -50%; left: -20%;
  width: 60%; height: 200%;
  background: rgba(255,255,255,0.06);
  border-radius: 50%;
  pointer-events: none;
}
.cta-banner::after {
  content: '';
  position: absolute;
  bottom: -50%; right: -20%;
  width: 60%; height: 200%;
  background: rgba(255,255,255,0.04);
  border-radius: 50%;
  pointer-events: none;
}
.cta-title {
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 900;
  color: white;
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
}
.cta-sub {
  font-size: 1rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 2.5rem;
  position: relative;
  z-index: 1;
}
.btn-cta-white {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 1rem 2.5rem;
  background: white;
  color: var(--primary);
  border-radius: var(--radius-full);
  font-weight: 800;
  font-size: 1.05rem;
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  transition: var(--transition);
  position: relative;
  z-index: 1;
}
.btn-cta-white:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 16px 40px rgba(0,0,0,0.2);
}

/* ============================================
   页脚 Footer
   ============================================ */
.footer {
  background: var(--gray-900);
  color: rgba(255,255,255,0.7);
  padding: 60px 2rem 30px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand { }
.footer-logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: white;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 1rem;
}
.footer-logo-icon {
  width: 36px; height: 36px;
  background: var(--gradient-main);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}
.footer-desc {
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.5);
  margin-bottom: 1.5rem;
}
.footer-social {
  display: flex;
  gap: 0.75rem;
}
.social-btn {
  width: 36px; height: 36px;
  background: rgba(255,255,255,0.08);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: var(--transition);
  cursor: pointer;
}
.social-btn:hover { background: var(--primary); transform: translateY(-2px); }
.footer-col h4 { color: white; font-size: 0.9rem; font-weight: 700; margin-bottom: 1rem; }
.footer-col a {
  display: block;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
  margin-bottom: 0.6rem;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--accent2); }
.footer-bottom {
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.3);
}
.footer-bottom a { color: rgba(255,255,255,0.4); }
.footer-bottom a:hover { color: var(--accent2); }

/* ============================================
   回到顶部按钮
   ============================================ */
.back-to-top {
  position: fixed;
  bottom: 2rem; right: 2rem;
  width: 48px; height: 48px;
  background: var(--gradient-main);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  z-index: 900;
  transition: var(--transition);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}
.back-to-top:hover { transform: translateY(-4px) scale(1.1); }

/* ============================================
   动画工具
   ============================================ */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeInRight {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: translateX(0); }
}
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}
.animate-delay-1 { transition-delay: 0.1s; }
.animate-delay-2 { transition-delay: 0.2s; }
.animate-delay-3 { transition-delay: 0.3s; }
.animate-delay-4 { transition-delay: 0.4s; }
.animate-delay-5 { transition-delay: 0.5s; }

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .nodes-grid { grid-template-columns: repeat(2, 1fr); }
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-visual { display: none; }
  .hero-actions { justify-content: center; }
  .hero-stats { justify-content: center; }
  .pricing-grid { grid-template-columns: 1fr; max-width: 380px; }
  .price-card.popular { transform: none; }
  .features-grid { grid-template-columns: 1fr; }
  .nodes-grid { grid-template-columns: repeat(2, 1fr); }
  .articles-grid { grid-template-columns: 1fr 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 2rem; }
}
@media (max-width: 480px) {
  .nodes-grid { grid-template-columns: 1fr; }
  .articles-grid { grid-template-columns: 1fr; }
  .hero-stats { flex-wrap: wrap; gap: 1rem; }
}