@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;800&display=swap');

:root {
  --bg-primary: #0f172a;      /* 深蓝黑底色 */
  --bg-secondary: #1e293b;    /* 稍亮的深色用于卡片 */
  --bg-tertiary: #334155;     /* 边框及辅助背景 */
  --accent: #10b981;          /* 龙猫自然绿 */
  --accent-hover: #059669;    /* 深自然绿 */
  --accent-light: rgba(16, 185, 129, 0.15); 
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --border-radius: 16px;
  --transition: all 0.3s ease;
  --nav-height: 80px;
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

/* 粒子背景层 */
#particles-js {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* 防止内容被背景遮挡 */
.content-wrapper {
  position: relative;
  z-index: 10;
}

/* --- Navigation --- */
header {
  position: fixed;
  top: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  justify-content: center;
  z-index: 1000;
  transition: var(--transition);
}

.nav-container {
  width: 90%;
  max-width: 1200px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 20;
}

.logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 30px;
}

@media (min-width: 769px) {
  .nav-links {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
  }
}

.nav-links a {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-secondary);
  transition: var(--transition);
}

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

.nav-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.btn-primary {
  background: var(--accent);
  color: #ffffff !important;
  padding: 10px 24px;
  border-radius: 30px;
  font-weight: 600;
  transition: var(--transition);
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.btn-primary:hover {
  background: transparent;
  border-color: var(--accent);
  color: var(--accent) !important;
  box-shadow: 0 0 20px var(--accent-light);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border-color: var(--accent);
  color: var(--accent) !important;
}

.btn-outline:hover {
  background: var(--accent);
  color: #ffffff !important;
  box-shadow: 0 0 20px var(--accent-light);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* --- Common Section Styles --- */
section {
  padding: 100px 0;
  display: flex;
  justify-content: center;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  text-align: center;
  font-size: 2.5rem;
  margin-bottom: 50px;
  font-weight: 800;
}

.section-title span {
  color: var(--accent);
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding-top: var(--nav-height);
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 4rem;
  font-weight: 800;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff, var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.hero .btn-primary {
  padding: 15px 40px;
  font-size: 1.2rem;
}

/* --- Features Section --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.feature-card {
  background: var(--bg-secondary);
  padding: 40px 30px;
  border-radius: var(--border-radius);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: var(--transition);
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-10px);
  border-color: var(--accent);
  box-shadow: 0 10px 30px var(--accent-light);
}

.feature-icon {
  font-size: 3rem;
  color: var(--accent);
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
}

.feature-card p {
  color: var(--text-secondary);
}

/* --- Node Status Section --- */
.node-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.node-table th, .node-table td {
  padding: 20px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.node-table th {
  background: rgba(0, 0, 0, 0.2);
  color: var(--text-secondary);
  font-weight: 600;
}

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

.status-indicator {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 10px;
  box-shadow: 0 0 10px var(--accent);
}

.ping {
  font-family: monospace;
  color: var(--accent);
  font-weight: bold;
}

/* --- Pricing Section --- */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
  align-items: center;
}

.price-card {
  background: var(--bg-secondary);
  border-radius: var(--border-radius);
  padding: 50px 30px;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.price-card.popular {
  border-color: var(--accent);
  background: linear-gradient(to bottom, var(--bg-secondary), rgba(16, 185, 129, 0.05));
  transform: scale(1.05);
}

.price-card.popular::before {
  content: "推荐推荐";
  position: absolute;
  top: 15px;
  right: -35px;
  background: var(--accent);
  color: #fff;
  font-size: 0.8rem;
  font-weight: bold;
  padding: 5px 40px;
  transform: rotate(45deg);
}

.price-card:hover {
  transform: translateY(-10px);
  border-color: var(--accent);
}

.price-card.popular:hover {
  transform: scale(1.05) translateY(-10px);
}

.price-card h3 {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.price {
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 20px;
}

.price span {
  font-size: 1rem;
  color: var(--text-secondary);
}

.price-features {
  margin-bottom: 40px;
}

.price-features li {
  margin-bottom: 15px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.price-features li i {
  color: var(--accent);
}

/* --- Reviews Section --- */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.review-card {
  background: var(--bg-secondary);
  padding: 30px;
  border-radius: var(--border-radius);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.stars {
  color: #fbbf24;
  margin-bottom: 15px;
}

.review-text {
  color: var(--text-secondary);
  margin-bottom: 20px;
  font-style: italic;
}

.reviewer {
  display: flex;
  align-items: center;
  gap: 15px;
}

.reviewer-avatar {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  color: var(--accent);
}

/* --- FAQ Section --- */
.faq-container {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-secondary);
  border-radius: 10px;
  margin-bottom: 15px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  overflow: hidden;
}

.faq-question {
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
}

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

.faq-answer {
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: all 0.4s ease;
  color: var(--text-secondary);
}

.faq-item.active .faq-answer {
  padding: 0 20px 20px;
  max-height: 200px;
}

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

/* --- Knowledge Base Section --- */
.kb-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.kb-card {
  display: block;
  background: var(--bg-secondary);
  padding: 20px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: var(--transition);
}

.kb-card:hover {
  transform: translateX(10px);
  border-color: var(--accent);
}

.kb-card h4 {
  color: var(--text-primary);
  margin-bottom: 10px;
}

.kb-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* --- Footer --- */
footer {
  background: var(--bg-secondary);
  padding: 50px 0 20px;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  margin-bottom: 30px;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-links a {
  color: var(--text-secondary);
}

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

.copyright {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* --- Responsive --- */
@media (max-width: 992px) {
  .price-card.popular {
    transform: scale(1);
  }
  .price-card.popular:hover {
    transform: translateY(-10px);
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  .nav-links {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: 20px 0;
    text-align: center;
    clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
    transition: var(--transition);
  }
  .nav-links.active {
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
  }
  .hero h1 {
    font-size: 2.5rem;
  }
}