/* CyberGuard 机场官网 - 全局主样式文件 (icyberguard.rest) */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --font-primary: "KaiTi", "STKaiti", "楷体", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, serif;
  
  /* 科技蓝 + 高级灰 核心调色盘 */
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: rgba(37, 99, 235, 0.1);
  --primary-glow: rgba(37, 99, 235, 0.35);
  --accent-blue: #0284c7;
  --accent-cyan: #06b6d4;
  
  --bg-dark: #0b0f19;
  --bg-surface: #111827;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(37, 99, 235, 0.4);
  
  --glass-bg: rgba(15, 23, 42, 0.65);
  --glass-border: rgba(255, 255, 255, 0.1);
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-lg: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(37, 99, 235, 0.25);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-dark);
  color: var(--text-main);
  line-height: 1.7;
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 动态背景 canvas 覆盖 */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.6;
}

/* 毛玻璃容器通用类 */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
}

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* 头部导航栏 */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: var(--transition);
  padding: 18px 0;
  background: rgba(11, 15, 25, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.header.scrolled {
  padding: 12px 0;
  background: rgba(11, 15, 25, 0.92);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: 0.5px;
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-glow);
  color: #fff;
}

.brand-text span {
  color: var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 1.05rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 6px 0;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-main);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--accent-cyan));
  transition: var(--transition);
  border-radius: 2px;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #1d4ed8);
  color: #ffffff;
  padding: 10px 24px;
  border-radius: 30px;
  font-weight: 600;
  font-size: 0.98rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
  transition: var(--transition);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(37, 99, 235, 0.6);
  background: linear-gradient(135deg, #3b82f6, #2563eb);
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

/* HERO SECTION */
.hero {
  padding: 170px 0 100px;
  position: relative;
}

.hero-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  background: rgba(37, 99, 235, 0.12);
  border: 1px solid rgba(37, 99, 235, 0.3);
  border-radius: 30px;
  color: #60a5fa;
  font-size: 0.92rem;
  margin-bottom: 24px;
}

.hero-badge i {
  color: var(--accent-cyan);
}

.hero-title {
  font-size: 3.2rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 24px;
  letter-spacing: -0.5px;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, #60a5fa, #38bdf8, #818cf8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

.hero-notice {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid rgba(37, 99, 235, 0.25);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  text-align: left;
  font-size: 0.98rem;
  color: #cbd5e1;
  margin: 0 auto 40px;
  max-width: 840px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

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

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border: 1px solid var(--glass-border);
  padding: 10px 24px;
  border-radius: 30px;
  font-weight: 500;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
}

/* SECTION COMMON */
.section {
  padding: 90px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section-tag {
  color: var(--primary);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 10px;
  display: block;
}

.section-title {
  font-size: 2.3rem;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-main);
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* 核心优势 GRID */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.feature-card {
  padding: 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--primary-light);
  color: #60a5fa;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 22px;
}

.feature-card h3 {
  font-size: 1.3rem;
  margin-bottom: 12px;
  color: var(--text-main);
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.7;
}

/* 套餐价格 SECTION (严格匹配 图1) */
.pricing-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  align-items: stretch;
  max-width: 1100px;
  margin: 0 auto;
}

.pricing-card {
  background: #ffffff;
  color: #1e293b;
  border-radius: 18px;
  padding: 36px 30px;
  position: relative;
  display: flex;
  flex-direction: column;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
  transition: var(--transition);
  border: 2px solid transparent;
}

.pricing-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
}

.pricing-card.featured {
  border-color: #2563eb;
}

.recommend-tag {
  position: absolute;
  top: -14px;
  right: 24px;
  background: #2563eb;
  color: #ffffff;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.4);
}

.plan-header h3 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 16px;
}

.plan-price {
  margin-bottom: 28px;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.price-currency {
  font-size: 1.8rem;
  font-weight: 800;
  color: #2563eb;
}

.price-amount {
  font-size: 2.8rem;
  font-weight: 800;
  color: #2563eb;
  letter-spacing: -1px;
}

.price-period {
  color: #94a3b8;
  font-size: 0.95rem;
  font-weight: 500;
}

.plan-features {
  list-style: none;
  margin-bottom: 36px;
  flex-grow: 1;
}

.plan-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 1rem;
  color: #334155;
  font-weight: 500;
}

.plan-features li i.fa-check {
  color: #22c55e;
  font-size: 1rem;
}

.plan-features li i.fa-bolt {
  color: #f59e0b;
  font-size: 1rem;
}

.btn-buy {
  width: 100%;
  padding: 14px;
  border-radius: 12px;
  border: none;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
  text-decoration: none;
  display: block;
}

.pricing-card .btn-buy {
  background: #f1f5f9;
  color: #0f172a;
}

.pricing-card .btn-buy:hover {
  background: #e2e8f0;
}

.pricing-card.featured .btn-buy {
  background: #2563eb;
  color: #ffffff;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.pricing-card.featured .btn-buy:hover {
  background: #1d4ed8;
  box-shadow: 0 10px 25px rgba(37, 99, 235, 0.6);
}

/* 节点列表 SECTION */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.node-card {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
}

.node-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
}

.node-info {
  display: flex;
  align-items: center;
  gap: 14px;
}

.flag-icon {
  font-size: 1.8rem;
  border-radius: 4px;
}

.node-name {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-main);
}

.node-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.node-status {
  text-align: right;
}

.ping-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.25);
  color: #4ade80;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.ping-dot {
  width: 6px;
  height: 6px;
  background: #22c55e;
  border-radius: 50%;
  box-shadow: 0 0 8px #22c55e;
}

/* 文章知识库 GRID */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 28px;
}

.article-card {
  padding: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  text-decoration: none;
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
}

.article-tag {
  color: var(--accent-cyan);
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.article-card h3 {
  font-size: 1.25rem;
  color: var(--text-main);
  line-height: 1.5;
  margin-bottom: 14px;
}

.article-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 20px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--text-dim);
  font-size: 0.88rem;
}

.article-meta span {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* FAQ SECTION */
.faq-accordion {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

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

.faq-header {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  user-select: none;
}

.faq-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
}

.faq-icon {
  color: var(--primary);
  transition: var(--transition);
}

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

.faq-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0, 1, 0, 1);
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.8;
}

.faq-item.active .faq-body {
  max-height: 500px;
  padding: 0 24px 20px;
  transition: max-height 0.35s ease-in-out;
}

/* FOOTER */
.footer {
  background: #080b12;
  padding: 70px 0 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-about p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 16px;
  max-width: 320px;
}

.footer-col h4 {
  color: var(--text-main);
  font-size: 1.05rem;
  margin-bottom: 20px;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 12px;
}

.footer-col ul li a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--primary);
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-dim);
  font-size: 0.9rem;
}

/* 文章详情页 专属样式 */
.article-page {
  padding-top: 14px;
}

.article-header {
  padding: 140px 0 40px;
  text-align: center;
  background: radial-gradient(circle at 50% 30%, rgba(37, 99, 235, 0.15), transparent 70%);
}

.article-title-main {
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 20px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.article-stats-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  color: var(--text-muted);
  font-size: 0.92rem;
  padding: 12px 24px;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--glass-border);
  border-radius: 30px;
  display: inline-flex;
  margin-top: 16px;
}

.article-body {
  max-width: 860px;
  margin: 40px auto;
  font-size: 1.12rem;
  line-height: 2;
  color: #e2e8f0;
}

.article-body h2 {
  font-size: 1.8rem;
  color: var(--text-main);
  margin: 40px 0 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(37, 99, 235, 0.3);
}

.article-body h3 {
  font-size: 1.4rem;
  color: #93c5fd;
  margin: 28px 0 14px;
}

.article-body p {
  margin-bottom: 22px;
  text-align: justify;
}

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

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

.article-cta-box {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.2), rgba(6, 182, 212, 0.15));
  border: 1px solid rgba(37, 99, 235, 0.4);
  border-radius: var(--radius-lg);
  padding: 36px;
  text-align: center;
  margin: 50px 0;
  box-shadow: var(--shadow-glow);
}

.article-cta-box h3 {
  font-size: 1.6rem;
  color: var(--text-main);
  margin-bottom: 12px;
}

.article-cta-box p {
  color: var(--text-muted);
  margin-bottom: 24px;
}

/* 响应式断点 */
@media (max-width: 992px) {
  .pricing-container {
    grid-template-columns: 1fr;
    max-width: 460px;
  }
  .hero-title {
    font-size: 2.4rem;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(11, 15, 25, 0.98);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--glass-border);
  }
  .nav-links.active {
    display: flex;
  }
  .mobile-toggle {
    display: block;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 2rem;
  }
}