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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

.header {
  background: linear-gradient(135deg, #2c3e50, #34495e);
  color: white;
  padding: 30px;
  text-align: center;
}

.header h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
  font-weight: 300;
}

.header p {
  opacity: 0.9;
  font-size: 1.1rem;
}

.content {
  padding: 40px;
}

.input-section {
  margin-bottom: 30px;
}

.input-section h3 {
  color: #2c3e50;
  margin-bottom: 15px;
  font-size: 1.3rem;
  font-weight: 500;
}

textarea {
  width: 100%;
  min-height: 200px;
  padding: 20px;
  border: 2px solid #e0e6ed;
  border-radius: 12px;
  font-family: "Courier New", monospace;
  font-size: 14px;
  line-height: 1.5;
  resize: vertical;
  transition: all 0.3s ease;
  background: #f8f9fa;
}

textarea:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
  background: white;
}

.button-group {
  display: flex;
  gap: 15px;
  margin: 25px 0;
  flex-wrap: wrap;
}

button {
  padding: 12px 30px;
  border: none;
  border-radius: 25px;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.format-btn {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.format-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.minify-btn {
  background: linear-gradient(135deg, #f093fb, #f5576c);
  color: white;
  box-shadow: 0 4px 15px rgba(245, 87, 108, 0.3);
}

.minify-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(245, 87, 108, 0.4);
}

.clear-btn {
  background: linear-gradient(135deg, #a8edea, #fed6e3);
  color: #2c3e50;
  box-shadow: 0 4px 15px rgba(168, 237, 234, 0.3);
}

.clear-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(168, 237, 234, 0.4);
}

.validate-btn {
  background: linear-gradient(135deg, #36d1c4, #5b86e5);
  color: white;
  box-shadow: 0 4px 15px rgba(91, 134, 229, 0.2);
  border-radius: 25px;
  font-size: 16px;
  font-weight: 500;
  padding: 12px 30px;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-left: 10px;
}

.validate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(91, 134, 229, 0.3);
  filter: brightness(1.08);
}

.error {
  background: linear-gradient(135deg, #ff6b6b, #ee5a24);
  color: white;
  padding: 15px 20px;
  border-radius: 10px;
  margin: 15px 0;
  font-weight: 500;
  animation: shake 0.5s ease-in-out;
}

.success {
  background: linear-gradient(135deg, #2ecc71, #27ae60);
  color: white;
  padding: 15px 20px;
  border-radius: 10px;
  margin: 15px 0;
  font-weight: 500;
  animation: fadeIn 0.5s ease-in-out;
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-5px);
  }
  75% {
    transform: translateX(5px);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.stats {
  display: flex;
  gap: 20px;
  margin: 20px 0;
  flex-wrap: wrap;
}

.stat {
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  padding: 15px 20px;
  border-radius: 10px;
  text-align: center;
  min-width: 120px;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: bold;
  color: #2c3e50;
}

.stat-label {
  font-size: 0.9rem;
  color: #6c757d;
  margin-top: 5px;
}

.copy-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0 8px;
  border-radius: 6px;
  transition: background 0.2s;
  color: #667eea;
  display: flex;
  align-items: center;
  justify-content: center;
}

.copy-btn:hover,
.copy-btn:focus {
  background: #f0f4ff;
}

.copy-btn:active {
  background: #e0e6f8;
}

.copy-btn svg {
  display: block;
}