/* Modern ToothBrush Styles */
:root {
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --dark-gradient: linear-gradient(135deg, #0c0c0c 0%, #1a1a2e 100%);
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.8);
  --shadow-glow: 0 8px 32px rgba(31, 38, 135, 0.37);
}

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

body {
  font-family: 'Inter', 'Noto Sans SC', sans-serif;
  background: var(--dark-gradient);
  min-height: 100vh;
  color: var(--text-primary);
  overflow-x: hidden;
  position: relative;
}

/* 动态背景粒子 */
.particles-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: radial-gradient(circle, #667eea, transparent);
  border-radius: 50%;
  animation: float 6s ease-in-out infinite;
}

.particle:nth-child(1) { top: 20%; left: 20%; animation-delay: 0s; }
.particle:nth-child(2) { top: 60%; left: 80%; animation-delay: 1s; }
.particle:nth-child(3) { top: 80%; left: 40%; animation-delay: 2s; }
.particle:nth-child(4) { top: 40%; left: 60%; animation-delay: 3s; }
.particle:nth-child(5) { top: 10%; left: 90%; animation-delay: 4s; }
.particle:nth-child(6) { top: 90%; left: 10%; animation-delay: 5s; }

@keyframes float {
  0%, 100% { transform: translateY(0px) scale(1); opacity: 0.7; }
  50% { transform: translateY(-20px) scale(1.1); opacity: 1; }
}

/* 主容器 */
.main-container {
  position: relative;
  z-index: 2;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Hero Section */
.hero-section {
  padding: 4rem 2rem 2rem;
  text-align: center;
  background: linear-gradient(180deg, rgba(102, 126, 234, 0.1) 0%, transparent 100%);
}

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

.logo-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.logo-icon {
  font-size: 3rem;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 0;
  animation: slideInDown 1s ease-out;
}

.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  animation: slideInUp 1s ease-out 0.2s both;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.6;
  animation: fadeIn 1s ease-out 0.4s both;
}

/* Tools Section */
.tools-section {
  flex: 1;
  padding: 3rem 2rem;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-header p {
  font-size: 1.2rem;
  color: var(--text-secondary);
}

/* Tools Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

/* Tool Cards */
.tool-card {
  position: relative;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 2.5rem 2rem;
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  overflow: hidden;
  box-shadow: var(--shadow-glow);
}

.tool-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--primary-gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: -1;
}

.tool-card:hover::before {
  opacity: 0.1;
}

.tool-card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: 0 20px 40px rgba(102, 126, 234, 0.3);
  border-color: rgba(102, 126, 234, 0.5);
}

.tool-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-gradient);
  border-radius: 20px;
  font-size: 2rem;
  color: white;
  box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
  transition: all 0.3s ease;
}

.tool-card:hover .tool-icon {
  transform: rotateY(180deg) scale(1.1);
  box-shadow: 0 15px 40px rgba(102, 126, 234, 0.6);
}

.tool-card h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  text-align: center;
}

.tool-card p {
  font-size: 1rem;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.5;
}

/* Coming Soon Card */
.coming-soon {
  position: relative;
  opacity: 0.7;
}

.coming-soon-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--secondary-gradient);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 500;
}

/* Card Glow Effect */
.card-glow {
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: var(--primary-gradient);
  border-radius: 22px;
  z-index: -2;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.tool-card:hover .card-glow {
  opacity: 0.3;
  animation: glow-pulse 2s ease-in-out infinite;
}

@keyframes glow-pulse {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 0.6; }
}

/* Modern Footer */
.modern-footer {
  padding: 2rem;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--glass-border);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-left, .footer-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
}

.footer-left i {
  color: #667eea;
}

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

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.fade-in-up {
  animation: fadeInUp 0.6s ease-out forwards;
  opacity: 0;
}

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

/* Responsive Design */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.2rem;
  }
  
  .section-header h2 {
    font-size: 2rem;
  }
  
  .tools-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .tool-card {
    padding: 2rem 1.5rem;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-section {
    padding: 2rem 1rem;
  }
  
  .tools-section {
    padding: 2rem 1rem;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .logo-icon {
    font-size: 2rem;
  }
}

/* Converter styles (keeping existing functionality) */
.converter {
  width: min(95%, 1100px);
  margin: 2rem auto 3rem;
  display: flex;
  flex-wrap: wrap;
  gap: 2rem 3rem;
  justify-content: center;
  align-items: flex-start;
}

.field {
  flex: 1 1 420px;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.field label {
  font-weight: 600;
  font-size: 1rem;
  opacity: 0.9;
}

.converter textarea {
  min-height: 190px;
  padding: 1rem;
  border-radius: 12px;
  border: none;
  resize: vertical;
  font-family: monospace;
  font-size: 0.95rem;
  background: var(--glass-bg);
  backdrop-filter: blur(6px);
  color: #fff;
  outline: none;
  border: 1px solid var(--glass-border);
}

.btn-group {
  flex: 0 0 140px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  justify-content: center;
  align-items: center;
}

.btn-group button {
  width: 140px;
  padding: 0.75rem 1rem;
  border-radius: 9999px;
  border: none;
  cursor: pointer;
  background: var(--glass-bg);
  color: #fff;
  font-weight: 600;
  transition: all 0.3s ease;
  border: 1px solid var(--glass-border);
}

.btn-group button:hover {
  background: var(--primary-gradient);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}