/* ========================================
   Frontend Showcase - Global Styles
   光敏癫痫友好设计：无快速闪烁，所有过渡平滑
   ======================================== */

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

:root {
  --primary: #00d4ff;
  --secondary: #7b2cbf;
  --accent: #ff006e;
  --bg-dark: #0a0a0f;
  --bg-card: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.1);
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --font-display: 'Orbitron', sans-serif;
  --font-body: 'Inter', sans-serif;
  --transition-slow: 1.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-medium: 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 减少动画偏好设置 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-dark);
  color: var(--text-primary);
  overflow-x: hidden;
  line-height: 1.6;
}

/* 粒子画布层 */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* 渐变背景层 */
.gradient-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: 
    radial-gradient(ellipse at 20% 20%, rgba(123, 44, 191, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 50%, rgba(255, 0, 110, 0.05) 0%, transparent 70%),
    var(--bg-dark);
  animation: gradientShift 20s ease-in-out infinite alternate;
}

@keyframes gradientShift {
  0% { opacity: 1; transform: scale(1); }
  100% { opacity: 0.9; transform: scale(1.05); }
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 1.5rem 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  background: rgba(10, 10, 15, 0.7);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  transition: var(--transition-medium);
}

.logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
  letter-spacing: 2px;
}

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

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  transition: var(--transition-medium);
  letter-spacing: 1px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transition: var(--transition-medium);
}

.nav-links a:hover {
  color: var(--text-primary);
}

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

.nav-links a.active {
  color: var(--primary);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  position: relative;
  padding: 3rem 5%;
  background: rgba(0, 0, 0, 0.5);
  border-top: 1px solid var(--glass-border);
  text-align: center;
  z-index: 10;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition-medium);
  font-size: 0.9rem;
}

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

.beian {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 2;
  opacity: 0.8;
}

.beian a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition-medium);
}

.beian a:hover {
  color: var(--primary);
}

.copyright {
  margin-top: 1rem;
  color: var(--text-secondary);
  font-size: 0.8rem;
  opacity: 0.6;
}

/* ========================================
   Glass Card
   ======================================== */
.glass-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 2.5rem;
  transition: var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
  transition: var(--transition-slow);
}

.glass-card:hover::before {
  left: 100%;
}

.glass-card:hover {
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 20px 60px rgba(0, 212, 255, 0.1);
  transform: translateY(-5px);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 600;
  letter-spacing: 1px;
  transition: var(--transition-medium);
  position: relative;
  overflow: hidden;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 0.95rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  box-shadow: 0 10px 30px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 50px rgba(0, 212, 255, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--primary);
}

/* ========================================
   Section Styles
   ======================================== */
.section {
  position: relative;
  min-height: 100vh;
  padding: 120px 5% 80px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  z-index: 1;
}

.section-header {
  text-align: center;
  margin-bottom: 5rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 900;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--text-primary), var(--primary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 3px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto;
  font-weight: 300;
}

/* ========================================
   Scroll Indicator
   ======================================== */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 0.8rem;
  letter-spacing: 2px;
  animation: bounce 3s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

.scroll-indicator::after {
  content: '';
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--primary), transparent);
}

/* ========================================
   Utility
   ======================================== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 加载动画 */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 1.5s ease-out forwards;
}

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }
.delay-4 { animation-delay: 0.8s; }

/* 鼠标跟随光晕 */
.cursor-glow {
  position: fixed;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.08) 0%, transparent 70%);
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: left 0.3s ease-out, top 0.3s ease-out;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
  .nav-links {
    gap: 1.5rem;
  }
  
  .nav-links a {
    font-size: 0.85rem;
  }
  
  .section {
    padding: 100px 5% 60px;
  }
  
  .glass-card {
    padding: 1.5rem;
  }
  
  .cursor-glow {
    display: none;
  }
}