/* ===== CSS Variables ===== */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.85);
  --accent-1: #00d4ff;
  --accent-2: #7c3aed;
  --accent-gradient: linear-gradient(135deg, #00d4ff, #7c3aed);
  --text-primary: #f0f4ff;
  --text-secondary: #94a3b8;
  --border-color: rgba(255,255,255,0.08);
  --glow: 0 0 30px rgba(0,212,255,0.15);
  --radius: 16px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ===== Animated Background ===== */
.bg-canvas {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  z-index: 2; pointer-events: none;
}
.bg-gradient {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: radial-gradient(ellipse at 20% 50%, rgba(0,212,255,0.08) 0%, transparent 50%),
              radial-gradient(ellipse at 80% 20%, rgba(124,58,237,0.08) 0%, transparent 50%),
              radial-gradient(ellipse at 50% 80%, rgba(0,212,255,0.05) 0%, transparent 50%);
  z-index: 1; pointer-events: none;
}

/* ===== Stars Layer ===== */
.stars, .stars2, .stars3 {
  position: fixed; top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 1; pointer-events: none;
}
.stars {
  background: radial-gradient(1px 1px at 20px 30px, rgba(255,255,255,0.8), transparent),
              radial-gradient(1px 1px at 40px 70px, rgba(255,255,255,0.6), transparent),
              radial-gradient(1px 1px at 90px 40px, rgba(255,255,255,0.7), transparent),
              radial-gradient(1px 1px at 130px 80px, rgba(255,255,255,0.5), transparent),
              radial-gradient(1px 1px at 160px 120px, rgba(255,255,255,0.9), transparent),
              radial-gradient(1.5px 1.5px at 200px 50px, rgba(0,212,255,0.8), transparent),
              radial-gradient(1px 1px at 250px 90px, rgba(255,255,255,0.6), transparent),
              radial-gradient(1px 1px at 300px 150px, rgba(255,255,255,0.7), transparent),
              radial-gradient(1.5px 1.5px at 350px 30px, rgba(124,58,237,0.7), transparent),
              radial-gradient(1px 1px at 400px 110px, rgba(255,255,255,0.5), transparent);
  background-repeat: repeat;
  background-size: 420px 160px;
  animation: starsMove 80s linear infinite;
}
.stars2 {
  background: radial-gradient(1.5px 1.5px at 50px 60px, rgba(255,255,255,0.7), transparent),
              radial-gradient(1px 1px at 100px 20px, rgba(0,212,255,0.6), transparent),
              radial-gradient(1.5px 1.5px at 180px 100px, rgba(255,255,255,0.8), transparent),
              radial-gradient(1px 1px at 230px 140px, rgba(124,58,237,0.5), transparent),
              radial-gradient(1px 1px at 280px 50px, rgba(255,255,255,0.6), transparent),
              radial-gradient(2px 2px at 330px 80px, rgba(0,212,255,0.7), transparent),
              radial-gradient(1px 1px at 380px 130px, rgba(255,255,255,0.5), transparent);
  background-repeat: repeat;
  background-size: 430px 170px;
  animation: starsMove 120s linear infinite;
  opacity: 0.7;
}
.stars3 {
  background: radial-gradient(2px 2px at 70px 90px, rgba(255,255,255,0.9), transparent),
              radial-gradient(2px 2px at 150px 40px, rgba(0,212,255,0.8), transparent),
              radial-gradient(1.5px 1.5px at 220px 120px, rgba(124,58,237,0.7), transparent),
              radial-gradient(2px 2px at 310px 60px, rgba(255,255,255,0.6), transparent),
              radial-gradient(1.5px 1.5px at 370px 100px, rgba(0,212,255,0.5), transparent);
  background-repeat: repeat;
  background-size: 440px 160px;
  animation: twinkle 4s ease-in-out infinite alternate, starsMove 200s linear infinite;
}
@keyframes starsMove {
  from { transform: translateY(0); }
  to { transform: translateY(-160px); }
}
@keyframes twinkle {
  0% { opacity: 0.5; }
  50% { opacity: 1; }
  100% { opacity: 0.6; }
}

/* ===== Shooting Stars ===== */
.shooting-star {
  position: fixed;
  width: 100px;
  height: 1px;
  background: linear-gradient(90deg, rgba(0,212,255,0.8), transparent);
  z-index: 0;
  pointer-events: none;
  opacity: 0;
  animation: shoot 6s ease-in-out infinite;
}
.shooting-star:nth-child(1) { top: 15%; left: -100px; animation-delay: 0s; }
.shooting-star:nth-child(2) { top: 35%; left: -100px; animation-delay: 2s; }
.shooting-star:nth-child(3) { top: 55%; left: -100px; animation-delay: 4s; }
@keyframes shoot {
  0% { transform: translateX(0) translateY(0) rotate(-25deg); opacity: 0; }
  5% { opacity: 1; }
  15% { transform: translateX(calc(100vw + 200px)) translateY(200px) rotate(-25deg); opacity: 0; }
  100% { opacity: 0; }
}

/* ===== Navigation ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10, 14, 26, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}
.navbar.scrolled { background: rgba(10, 14, 26, 0.98); box-shadow: var(--glow); }
.nav-container {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem; height: 70px;
}
.nav-logo {
  font-size: 1.4rem; font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; letter-spacing: 1px;
}
.nav-links { display: flex; gap: 0.5rem; list-style: none; }
.nav-links a {
  color: var(--text-secondary); text-decoration: none;
  padding: 0.5rem 1rem; border-radius: 8px;
  font-size: 0.95rem; font-weight: 500;
  transition: var(--transition); position: relative;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--text-primary);
  background: rgba(0,212,255,0.1);
}
.nav-links a.active::after {
  content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%);
  width: 20px; height: 2px; background: var(--accent-1); border-radius: 1px;
}

/* Mobile menu */
.nav-toggle { display: none; cursor: pointer; padding: 0.5rem; }
.nav-toggle span {
  display: block; width: 24px; height: 2px;
  background: var(--text-primary); margin: 5px 0;
  transition: var(--transition);
}

/* ===== Page Content ===== */
.page-content {
  position: relative; z-index: 3;
  padding-top: 70px; min-height: 100vh;
}

/* ===== Hero Section ===== */
.hero {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 8rem 2rem 6rem;
  position: relative;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: rgba(0,212,255,0.1); border: 1px solid rgba(0,212,255,0.2);
  padding: 0.4rem 1.2rem; border-radius: 50px;
  font-size: 0.85rem; color: var(--accent-1);
  margin-bottom: 2rem;
}
.hero-badge::before {
  content: ''; width: 6px; height: 6px;
  background: var(--accent-1); border-radius: 50%;
  animation: pulse 2s infinite;
}
.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800; line-height: 1.2;
  margin-bottom: 1.5rem;
}
.hero h1 .gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  font-size: 1.15rem; color: var(--text-secondary);
  max-width: 600px; margin-bottom: 2.5rem;
}
.hero-buttons { display: flex; gap: 1rem; flex-wrap: wrap; justify-content: center; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.8rem 2rem; border-radius: 12px;
  font-size: 0.95rem; font-weight: 600;
  text-decoration: none; transition: var(--transition);
  cursor: pointer; border: none;
}
.btn-primary {
  background: var(--accent-gradient);
  color: #fff; box-shadow: 0 4px 20px rgba(0,212,255,0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,212,255,0.4); }
.btn-outline {
  background: transparent; color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.btn-outline:hover { border-color: var(--accent-1); background: rgba(0,212,255,0.05); }

/* ===== Section ===== */
.section {
  max-width: 1200px; margin: 0 auto;
  padding: 5rem 2rem;
}
.section-header {
  text-align: center; margin-bottom: 3.5rem;
}
.section-header h2 {
  font-size: 2.2rem; font-weight: 700; margin-bottom: 1rem;
}
.section-header h2 .gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-header p {
  color: var(--text-secondary); font-size: 1.05rem; max-width: 600px; margin: 0 auto;
}

/* ===== Cards Grid ===== */
.cards-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 2rem;
  transition: var(--transition);
  position: relative; overflow: hidden;
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 3px; background: var(--accent-gradient);
  opacity: 0; transition: var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(0,212,255,0.2);
  box-shadow: var(--glow);
}
.card:hover::before { opacity: 1; }
.card-icon {
  width: 48px; height: 48px;
  background: rgba(0,212,255,0.1);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1.2rem; font-size: 1.4rem;
}
.card h3 { font-size: 1.15rem; margin-bottom: 0.6rem; font-weight: 600; }
.card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.6; }

/* ===== Stats ===== */
.stats-row {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem; margin: 4rem 0;
}
.stat-item {
  text-align: center; padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}
.stat-number {
  font-size: 2.5rem; font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { color: var(--text-secondary); font-size: 0.9rem; margin-top: 0.3rem; }

/* ===== Timeline ===== */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0;
  width: 2px; background: var(--accent-gradient);
}
.timeline-item {
  position: relative; padding: 1.5rem 0 1.5rem 2rem;
}
.timeline-item::before {
  content: ''; position: absolute; left: -2rem; top: 2rem;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent-1);
  box-shadow: 0 0 10px rgba(0,212,255,0.5);
  transform: translateX(-5px);
}
.timeline-item h3 { font-size: 1.1rem; margin-bottom: 0.3rem; }
.timeline-item p { color: var(--text-secondary); font-size: 0.95rem; }

/* ===== Contact Form ===== */
.contact-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 3rem;
}
.contact-info-list { display: flex; flex-direction: column; gap: 1.5rem; }
.contact-info-item {
  display: flex; align-items: flex-start; gap: 1rem;
  padding: 1.2rem; background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
}
.contact-info-item .icon {
  width: 40px; height: 40px; flex-shrink: 0;
  background: rgba(0,212,255,0.1); border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
}
.contact-info-item h4 { font-size: 0.95rem; margin-bottom: 0.2rem; }
.contact-info-item p { color: var(--text-secondary); font-size: 0.9rem; }
.contact-form {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 2rem;
}
.form-group { margin-bottom: 1.2rem; }
.form-group label { display: block; font-size: 0.9rem; margin-bottom: 0.4rem; color: var(--text-secondary); }
.form-group input, .form-group textarea {
  width: 100%; padding: 0.8rem 1rem;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border-color);
  border-radius: 10px; color: var(--text-primary);
  font-size: 0.95rem; font-family: inherit;
  transition: var(--transition);
}
.form-group input:focus, .form-group textarea:focus {
  outline: none; border-color: var(--accent-1);
  box-shadow: 0 0 0 3px rgba(0,212,255,0.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 3rem 2rem; text-align: center;
  color: var(--text-secondary); font-size: 0.9rem;
  position: relative; z-index: 3;
}
.footer a { color: var(--accent-1); text-decoration: none; }
.footer a:hover { text-decoration: underline; }

/* ===== Animations ===== */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in {
  opacity: 0; animation: fadeInUp 0.6s ease forwards;
}
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* ===== Loading Screen ===== */
.loading-screen {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: var(--bg-primary);
  z-index: 9999;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}
.loading-screen.hidden {
  opacity: 0; visibility: hidden;
  pointer-events: none;
}
.loading-logo {
  font-size: 1.8rem; font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 2rem;
  animation: loadPulse 1.5s ease-in-out infinite;
}
.loading-spinner {
  width: 40px; height: 40px;
  border: 3px solid rgba(255,255,255,0.1);
  border-top-color: var(--accent-1);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
.loading-text {
  margin-top: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  letter-spacing: 2px;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes loadPulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.98); }
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column;
    position: absolute; top: 70px; left: 0; right: 0;
    background: rgba(10,14,26,0.98); padding: 1rem;
    border-bottom: 1px solid var(--border-color);
  }
  .nav-toggle { display: block; }
  .contact-grid { grid-template-columns: 1fr; }
  .hero { padding: 5rem 1.5rem 4rem; }
  .section { padding: 3rem 1.5rem; }
}