* {
  margin: 0;
  padding: 0;
}

body {
  background: #f1f2f3;
}

.container {
  width: 100%;
  max-width: 1400px;
  min-width: 1100px;
  margin: 30px auto;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 20px;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.25);
  overflow: hidden;
  box-sizing: border-box;
  color: #333;
}

.container *{
  box-sizing: border-box;
}

header {
  color: #333;
  padding: 30px 40px;
  text-align: center;
}

h1 {
  font-size: 2.2rem;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
}

.subtitle {
  font-size: 1rem;
  opacity: 0.9;
  max-width: 85%;
  margin: 0 auto;
  line-height: 1.6;
  color: #6a6a6a;
}

.main-content {
  display: flex;
  padding: 20px;
  gap: 20px;
}

.input-section,
.output-section {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.section-title {
  font-size: 1.4rem;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: #2c3e50;
  font-weight: 600;
}

textarea {
  width: 100%;
  height: 320px;
  padding: 20px;
  font-size: 1.1rem;
  border: 2px solid #ddd;
  border-radius: 12px;
  resize: none;
  outline: none;
  transition: all 0.3s ease;
  background: #f9f9f9;
  box-shadow: inset 0 2px 5px rgba(0, 0, 0, 0.05);
}

textarea:focus {
  border-color: #3498db;
  box-shadow: inset 0 2px 5px rgba(52, 152, 219, 0.1);
}

.button-group {
  display: flex;
  gap: 15px;
  margin-top: 20px;
  flex-wrap: wrap;
}

.btn {
  padding: 14px 25px;
  font-size: 1.1rem;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

.btn-primary {
  background: linear-gradient(to right, #3498db, #2980b9);
  color: white;
  box-shadow: 0 4px 10px rgba(52, 152, 219, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(to right, #2980b9, #2573a7);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(52, 152, 219, 0.4);
}

.btn-secondary {
  background: linear-gradient(to right, #2ecc71, #27ae60);
  color: white;
  box-shadow: 0 4px 10px rgba(46, 204, 113, 0.3);
}

.btn-secondary:hover {
  background: linear-gradient(to right, #27ae60, #219d54);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(46, 204, 113, 0.4);
}

.btn-warning {
  background: linear-gradient(to right, #e74c3c, #c0392b);
  color: white;
  box-shadow: 0 4px 10px rgba(231, 76, 60, 0.3);
}

.btn-warning:hover {
  background: linear-gradient(to right, #c0392b, #a93226);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(231, 76, 60, 0.4);
}

.output-container {
  position: relative;
  background: #f0f8ff;
  border-radius: 12px;
  padding: 20px;
  border: 2px dashed #3498db;
  min-height: 320px;
  word-break: break-all;
  font-size: 1.1rem;
  line-height: 1.6;
}

.copy-btn {
  position: absolute;
  top: 15px;
  right: 15px;
  background: rgba(52, 152, 219, 0.9);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 8px 15px;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 5px;
}

.copy-btn:hover {
  background: #2980b9;
  transform: scale(1.05);
}

.options {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-top: 20px;
  padding: 15px;
  background: #f5f9ff;
  border-radius: 10px;
}

.checkbox-container {
  display: flex;
  align-items: center;
  gap: 8px;
}

.checkbox-container input {
  width: 20px;
  height: 20px;
  cursor: pointer;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
  padding: 30px 40px;
  background: linear-gradient(to right, #f8f9fa, #e9ecef);
}

.feature-card {
  background: white;
  border-radius: 15px;
  padding: 25px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
  transition: transform 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
}

.feature-card h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 15px;
  color: #2c3e50;
}

.feature-card p {
  color: #555;
  line-height: 1.7;
}

footer {
  text-align: center;
  padding: 25px;
  background: #2c3e50;
  color: #ecf0f1;
  font-size: 1.1rem;
}

.notification {
  position: fixed;
  top: 80px;
  right: 30px;
  background: #2ecc71;
  color: white;
  padding: 15px 25px;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  transform: translateX(200%);
  transition: transform 0.3s ease;
  z-index: 1000;
  display: flex;
  align-items: center;
  gap: 10px;
}

.notification.show {
  transform: translateX(0);
}

@media (max-width: 1400px) {
  .main-content {
    flex-direction: column;
  }
}