/* ==========================================================================
   山水云机场官网 (shanshuicloudjc.my) - 精致高雅视觉系统样式
   ========================================================================== */

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

:root {
  --bg-primary: #07090e;
  --bg-secondary: #0d111a;
  --bg-card: rgba(18, 24, 38, 0.75);
  --bg-card-hover: rgba(26, 36, 56, 0.85);
  
  --accent-cyan: #00f2fe;
  --accent-blue: #4facfe;
  --accent-purple: #7f00ff;
  --accent-gold: #e2b04a;
  
  --text-primary: #f0f4f8;
  --text-secondary: #a0aec0;
  --text-muted: #64748b;
  
  --border-light: rgba(255, 255, 255, 0.08);
  --border-gold: rgba(226, 176, 74, 0.3);
  --border-glow: rgba(0, 242, 254, 0.4);
  
  --font-serif: 'STKaiti', 'KaiTi', 'DFKai-SB', 'Noto Serif SC', serif;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-title: 'Cinzel', 'STKaiti', 'KaiTi', serif;
}

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

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-serif);
  line-height: 1.8;
  overflow-x: hidden;
  position: relative;
}

/* 粒子背板画布 */
#particles-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
}

/* 全屏大图背景遮罩 */
.hero-bg-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 50% 30%, rgba(13, 17, 26, 0.4) 0%, rgba(7, 9, 14, 0.92) 80%),
              url('hero-bg.png') no-repeat center center / cover;
  z-index: -2;
  filter: brightness(0.85) contrast(1.1);
}

/* 极简高雅导航栏 */
.header-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 1.2rem 4rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  transition: all 0.4s ease;
  backdrop-filter: blur(12px);
  background: rgba(7, 9, 14, 0.6);
  border-bottom: 1px solid var(--border-light);
}

.header-nav.scrolled {
  padding: 0.8rem 4rem;
  background: rgba(7, 9, 14, 0.92);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-primary);
  font-family: var(--font-title);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 2px;
}

.nav-brand .brand-logo {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 15px rgba(0, 242, 254, 0.5);
}

.nav-brand .brand-logo span {
  color: #fff;
  font-weight: bold;
  font-size: 1.2rem;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
  padding: 0.4rem 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

.nav-links a:hover {
  color: var(--accent-cyan);
}

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

.cta-btn-nav {
  background: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
  color: #050b14 !important;
  font-weight: 700 !important;
  padding: 0.6rem 1.6rem !important;
  border-radius: 30px;
  box-shadow: 0 4px 15px rgba(0, 242, 254, 0.3);
}

.cta-btn-nav:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 242, 254, 0.6);
}

.cta-btn-nav::after {
  display: none !important;
}

/* 全屏 Banner Section */
.hero-section {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 8rem 2rem 4rem;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.2rem;
  background: rgba(226, 176, 74, 0.12);
  border: 1px solid var(--border-gold);
  border-radius: 30px;
  color: var(--accent-gold);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
  backdrop-filter: blur(5px);
  animation: fadeInDown 1s ease;
}

.hero-title {
  font-size: 3.8rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, #ffffff 30%, #a5f3fc 70%, #4facfe 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 2px;
  animation: fadeInUp 1s ease 0.2s both;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 850px;
  margin: 0 auto 2.5rem;
  font-weight: 300;
  animation: fadeInUp 1s ease 0.4s both;
}

.hero-actions {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  animation: fadeInUp 1s ease 0.6s both;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
  color: #050b14;
  font-size: 1.1rem;
  font-weight: 700;
  padding: 0.9rem 2.5rem;
  border-radius: 40px;
  text-decoration: none;
  box-shadow: 0 8px 25px rgba(0, 242, 254, 0.35);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 12px 35px rgba(0, 242, 254, 0.6);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  font-size: 1.1rem;
  font-weight: 600;
  padding: 0.9rem 2.2rem;
  border-radius: 40px;
  text-decoration: none;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--accent-cyan);
  transform: translateY(-3px);
}

/* 包含关键词提示框 */
.hero-notice-box {
  margin-top: 3.5rem;
  background: rgba(13, 17, 26, 0.8);
  border: 1px solid rgba(0, 242, 254, 0.2);
  border-radius: 16px;
  padding: 1.5rem 2rem;
  max-width: 900px;
  text-align: left;
  backdrop-filter: blur(15px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  animation: fadeInUp 1s ease 0.8s both;
}

.hero-notice-title {
  color: var(--accent-cyan);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-notice-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 通用 Section 容器与网格悬停样式 */
.section-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 6rem 2rem;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-tag {
  color: var(--accent-cyan);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 3px;
  font-weight: 600;
  margin-bottom: 0.5rem;
  display: block;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 auto;
}

/* 网格布局 */
.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

/* 悬停微互动卡片 */
.hover-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 20px;
  padding: 2.5rem 2rem;
  transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.hover-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
  transform: translateX(-100%);
  transition: transform 0.6s ease;
}

.hover-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  box-shadow: 0 20px 40px rgba(0, 242, 254, 0.15);
}

.hover-card:hover::before {
  transform: translateX(100%);
}

.card-icon {
  width: 60px;
  height: 60px;
  border-radius: 16px;
  background: rgba(0, 242, 254, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 242, 254, 0.2);
}

.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: #fff;
}

.card-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* 核心优势模块 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

/* 套餐价格 Section (精确比照图1) */
.pricing-section {
  background: linear-gradient(180deg, rgba(7,9,14,0.5) 0%, rgba(13,17,26,0.8) 100%);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  align-items: stretch;
}

.pricing-card {
  background: #0f1420;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 2.2rem 1.8rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
}

.pricing-card:hover {
  border-color: var(--accent-gold);
  transform: translateY(-6px);
  box-shadow: 0 15px 35px rgba(226, 176, 74, 0.15);
}

.pricing-card.featured {
  border-color: var(--border-gold);
  background: linear-gradient(180deg, #141b2b 0%, #0f1420 100%);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
}

.pricing-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.2rem;
  border-bottom: 1px dashed rgba(255,255,255,0.1);
  padding-bottom: 1rem;
}

.pricing-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pricing-name {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
}

.pricing-price-wrap {
  text-align: right;
}

.pricing-price {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-gold);
  font-family: var(--font-sans);
}

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

/* 核心保速黑框标牌 */
.speed-guarantee-banner {
  background: rgba(226, 176, 74, 0.05);
  border: 1px solid rgba(226, 176, 74, 0.3);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
  font-size: 0.88rem;
  color: var(--accent-gold);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
}

.pricing-features-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.pricing-features-list li {
  font-size: 0.92rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.pricing-features-list li strong {
  color: var(--text-primary);
}

.badge-gold {
  background: rgba(226, 176, 74, 0.2);
  color: var(--accent-gold);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: bold;
}

.tg-btn-link {
  display: inline-block;
  background: rgba(0, 136, 204, 0.2);
  color: #0088cc;
  border: 1px solid rgba(0, 136, 204, 0.4);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.8rem;
  text-decoration: none;
  transition: all 0.2s ease;
}

.tg-btn-link:hover {
  background: #0088cc;
  color: #fff;
}

.btn-subscribe {
  width: 100%;
  text-align: center;
  padding: 0.85rem;
  background: linear-gradient(135deg, #1e293b, #0f172a);
  color: var(--accent-cyan);
  border: 1px solid var(--accent-cyan);
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-subscribe:hover {
  background: var(--accent-cyan);
  color: #050b14;
  box-shadow: 0 0 20px rgba(0, 242, 254, 0.5);
}

/* 节点列表 Section */
.node-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.2rem;
}

.node-card {
  background: rgba(15, 20, 32, 0.8);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 1.2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.3s ease;
}

.node-card:hover {
  border-color: var(--accent-cyan);
  background: rgba(22, 30, 48, 0.9);
}

.node-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.node-flag {
  font-size: 1.5rem;
}

.node-name {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

.node-type {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.node-ping {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-family: var(--font-sans);
  color: #10b981;
  font-weight: 600;
}

.ping-dot {
  width: 8px;
  height: 8px;
  background-color: #10b981;
  border-radius: 50%;
  box-shadow: 0 0 8px #10b981;
}

/* 文章知识库 Section */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 16px;
  padding: 1.8rem;
  display: flex;
  flex-direction: column;
  transition: all 0.3s ease;
  backdrop-filter: blur(8px);
}

.article-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-glow);
  box-shadow: 0 15px 30px rgba(0, 242, 254, 0.12);
}

.article-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
}

.article-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  line-height: 1.4;
}

.article-title a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.article-title a:hover {
  color: var(--accent-cyan);
}

.article-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.article-link {
  color: var(--accent-cyan);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.article-link:hover {
  text-decoration: underline;
}

/* FAQ 常见问题手风琴 */
.faq-container {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-question {
  padding: 1.2rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-question:hover {
  color: var(--accent-cyan);
}

.faq-icon {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
}

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

.faq-answer {
  padding: 0 1.5rem 1.2rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  display: none;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 1rem;
}

.faq-item.active .faq-answer {
  display: block;
}

/* 底部 Footer */
.footer-section {
  background: #040609;
  border-top: 1px solid var(--border-light);
  padding: 4rem 2rem 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-content {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand-title {
  font-family: var(--font-title);
  font-size: 1.4rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.footer-links-title {
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.footer-links-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links-list a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-links-list a:hover {
  color: var(--accent-cyan);
}

.footer-keywords-tag {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.8rem;
}

.kw-badge {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.08);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.footer-bottom {
  max-width: 1280px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.05);
  text-align: center;
}

/* Keyframe Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 响应式适配 */
@media (max-width: 1024px) {
  .features-grid, .pricing-grid, .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header-nav {
    padding: 1rem 1.5rem;
  }
  .nav-links {
    display: none;
  }
  .hero-title {
    font-size: 2.4rem;
  }
  .features-grid, .pricing-grid, .articles-grid {
    grid-template-columns: 1fr;
  }
  .footer-content {
    grid-template-columns: 1fr;
  }
}