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

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  background: linear-gradient(135deg, #ffb3b3 0%, #ff5252 100%);
  min-height: 100vh;
  color: #333;
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

/* Header Styles */
.header {
  text-align: center;
  margin-bottom: 40px;
}

.header-content {
  background: rgba(255, 235, 238, 0.7);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  padding: 30px;
  border: 1px solid #ffcdd2;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  margin-bottom: 10px;
}

.logo i {
  font-size: 2.5rem;
  color: #fff;
  background: linear-gradient(45deg, #e53935, #ff6b6b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: #e53935;
  text-shadow: 0 2px 4px rgba(229, 57, 53, 0.1);
}

.subtitle {
  color: #222;
  font-size: 1.1rem;
  font-weight: 400;
}

/* Main Content */
.main {
  display: grid;
  gap: 30px;
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .main {
    grid-template-columns: 2fr 1fr;
  }
}

/* Converter Card */
.converter-card {
  background: rgba(255, 235, 238, 0.95);
  backdrop-filter: blur(15px);
  border-radius: 20px;
  padding: 30px;
  box-shadow: 0 20px 40px rgba(229, 57, 53, 0.08);
  border: 1px solid #ffcdd2;
}

.card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 30px;
  padding-bottom: 20px;
  border-bottom: 2px solid #f0f0f0;
}

.card-header i {
  font-size: 1.5rem;
  color: #e53935;
}

.card-header h2 {
  font-size: 1.8rem;
  font-weight: 600;
  color: #e53935;
}

/* Form Styles */
.converter-form {
  display: flex;
  flex-direction: column;
  gap: 25px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-group label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  color: #b71c1c;
  font-size: 0.95rem;
}

.form-group label i {
  color: #e53935;
  font-size: 0.9rem;
}

select,
input {
  padding: 15px 18px;
  border: 2px solid #ffcdd2;
  border-radius: 12px;
  font-size: 1rem;
  font-family: inherit;
  background: #fff;
  transition: all 0.3s ease;
  outline: none;
}

select:focus,
input:focus {
  border-color: #e53935;
  box-shadow: 0 0 0 3px rgba(229, 57, 53, 0.1);
  transform: translateY(-1px);
}

select:hover,
input:hover {
  border-color: #ff6b6b;
}

/* Convert Button */
.convert-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 18px 30px;
  background: linear-gradient(135deg, #e53935 0%, #ff6b6b 100%);
  color: white;
  border: none;
  border-radius: 12px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  margin-top: 10px;
}

.convert-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(229, 57, 53, 0.2);
}

.convert-btn:active {
  transform: translateY(0);
}

.convert-btn.loading {
  pointer-events: none;
  opacity: 0.8;
}

.loading-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top: 2px solid #fff;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  display: none;
}

.convert-btn.loading .loading-spinner {
  display: block;
}

.convert-btn.loading span {
  display: none;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Result Section */
.result-section,
.error-section {
  margin-top: 30px;
  animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.result-card {
  background: linear-gradient(135deg, #ff6b6b 0%, #e53935 100%);
  border-radius: 15px;
  padding: 25px;
  color: white;
}

.result-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  font-size: 1.2rem;
  font-weight: 600;
}

.result-content {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px;
  background: rgba(255, 255, 255, 0.13);
  border-radius: 10px;
  backdrop-filter: blur(5px);
}

.result-label {
  font-weight: 500;
  color: #ffebee;
}

.result-value {
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
}

/* Error Section */
.error-card {
  background: linear-gradient(135deg, #d32f2f 0%, #e57373 100%);
  border-radius: 15px;
  padding: 25px;
  color: white;
}

.error-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 15px;
  font-size: 1.2rem;
  font-weight: 600;
}

.error-content {
  background: rgba(255, 255, 255, 0.13);
  padding: 15px;
  border-radius: 10px;
}

/* Info Section */
.info-section {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.info-card {
  background: rgba(255, 235, 238, 0.95);
  backdrop-filter: blur(15px);
  border-radius: 20px;
  padding: 25px;
  box-shadow: 0 10px 30px rgba(229, 57, 53, 0.08);
  border: 1px solid #ffcdd2;
}

.info-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  color: #e53935;
}

.info-header i {
  color: #e53935;
  font-size: 1.3rem;
}

.info-header h3 {
  font-size: 1.3rem;
  font-weight: 600;
}

.info-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: 1fr;
}

@media (min-width: 480px) {
  .info-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.info-item {
  padding: 12px 15px;
  background: #ffebee;
  border-radius: 8px;
  font-size: 0.9rem;
  border-left: 4px solid #e53935;
}

.info-item strong {
  color: #e53935;
}

/* Footer */
.footer {
  text-align: center;
  margin-top: 40px;
  padding: 20px;
  color: #e57373;
  font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 15px;
  }

  .logo h1 {
    font-size: 2rem;
  }

  .header-content {
    padding: 20px;
  }

  .converter-card {
    padding: 20px;
  }

  .card-header h2 {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .logo {
    flex-direction: column;
    gap: 10px;
  }

  .logo h1 {
    font-size: 1.8rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .result-item {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}

/* Animations */
.converter-card,
.info-card {
  animation: fadeInUp 0.6s ease-out;
}

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

/* Success animation */
.success-pulse {
  animation: pulse 0.6s ease-in-out;
}

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

.header-content,
.converter-card,
.info-card {
  color: #222;
}

.card-header h2,
.info-header h3,
.info-header,
.result-label,
.result-value,
.info-item,
.footer {
  color: #222;
}

.result-card,
.error-card {
  color: #222;
}

.result-value {
  color: #222;
}

.result-label {
  color: #333;
}

/* Chỉ giữ chữ trắng cho nút chuyển đổi và icon trên nền đỏ đậm */
.convert-btn,
.convert-btn * {
  color: #fff !important;
}
a {
  color: #e53935;
  text-decoration: none;
}

a:hover {
  opacity: 0.85;
  text-decoration: none;
}

.result-value div {
  margin-bottom: 4px;
}
.result-value strong {
  color: #4caf50;
}