:root {
  --primary-color: #4a90e2;
  --secondary-color: #f39c12;
  --accent-color: #e74c3c;
  --background-color: #f4f7f9;
  --text-color: #333;
  --border-radius: 12px;
  --transition-speed: 0.3s;
}

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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  color: var(--text-color);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.content {
  width: 100%;
  max-width: 800px;
  background-color: rgba(255, 255, 255, 0.9);
  border-radius: var(--border-radius);
  padding: 40px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  transition: all var(--transition-speed) ease;
  backdrop-filter: blur(10px);
}

h1 {
  text-align: center;
  margin-bottom: 30px;
  color: var(--primary-color);
  font-size: 2.5rem;
  position: relative;
  display: inline-block;
  left: 50%;
  transform: translateX(-50%);
}

h1::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--secondary-color);
  transform: scaleX(0);
  transition: transform var(--transition-speed) ease;
}

h1:hover::after {
  transform: scaleX(1);
}

.input-group {
  margin-bottom: 20px;
  position: relative;
}

label {
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
  transition: color var(--transition-speed) ease;
}

textarea,
select {
  width: 100%;
  padding: 12px;
  border: 2px solid #ddd;
  border-radius: var(--border-radius);
  font-size: 16px;
  transition: all var(--transition-speed) ease;
  background-color: rgba(255, 255, 255, 0.8);
}

textarea {
  height: 150px;
  resize: vertical;
}

textarea:focus,
select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23333' viewBox='0 0 12 12'%3E%3Cpath d='M10.293 3.293L6 7.586 1.707 3.293A1 1 0 00.293 4.707l5 5a1 1 0 001.414 0l5-5a1 1 0 10-1.414-1.414z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
}

.char-count {
  position: absolute;
  right: 10px;
  bottom: 10px;
  font-size: 12px;
  color: #888;
}

button {
  display: block;
  width: 100%;
  padding: 12px;
  background-color: var(--primary-color);
  color: #fff;
  border: none;
  border-radius: var(--border-radius);
  font-size: 18px;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  position: relative;
  overflow: hidden;
}

button:hover:not(:disabled) {
  background-color: #3a7bc8;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

button:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: none;
}

button:disabled {
  background-color: #ccc;
  cursor: not-allowed;
}

button .ripple {
  position: absolute;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.7);
  transform: scale(0);
  animation: ripple 0.6s linear;
}

@keyframes ripple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

.output {
  margin-top: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: rgba(240, 240, 240, 0.8);
  padding: 20px;
  border-radius: var(--border-radius);
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-speed) ease;
}

.output.show {
  opacity: 1;
  transform: translateY(0);
}

.output-text {
  font-weight: bold;
}

.loading {
  display: none;
  justify-content: center;
  align-items: center;
  margin-top: 20px;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid #f3f3f3;
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

  100% {
    transform: rotate(360deg);
  }
}

.footer {
  margin-top: 20px;
  text-align: center;
  font-size: 14px;
  color: #888;
}

.offline-message {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  z-index: 1000;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  color: #fff;
  text-align: center;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.offline-message-content {
  background-color: rgba(255, 255, 255, 0.1);
  padding: 40px;
  border-radius: var(--border-radius);
  backdrop-filter: blur(10px);
  max-width: 80%;
}

.offline-message img {
  width: 120px;
  height: 120px;
  margin-bottom: 20px;
  animation: pulse 2s infinite;
}

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

  50% {
    transform: scale(1.1);
  }

  100% {
    transform: scale(1);
  }
}

.offline-message h2 {
  font-size: 24px;
  margin-bottom: 10px;
}

.offline-message p {
  font-size: 18px;
  margin-bottom: 20px;
}

.offline-message button {
  margin-top: 20px;
  padding: 10px 20px;
  background-color: var(--secondary-color);
  color: #fff;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  font-size: 16px;
}

.offline-message button:hover {
  background-color: #e67e22;
  transform: translateY(-2px);
}

.audio-controls {
  display: none;
  justify-content: center;
  gap: 15px;
  margin-top: 20px;
}

.audio-controls button {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  background-color: var(--secondary-color);
  color: #fff;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  font-size: 16px;
}

.audio-controls button:hover {
  background-color: #e67e22;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.audio-controls button:active {
  transform: translateY(0);
  box-shadow: none;
}

.audio-controls button i {
  margin-right: 10px;
  font-size: 18px;
}

.audio-visualization {
  display: none;
  justify-content: center;
  align-items: center;
  height: 60px;
  margin-top: 20px;
  background-color: rgba(0, 0, 0, 0.1);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.audio-bar {
  width: 4px;
  height: 100%;
  background-color: var(--primary-color);
  margin: 0 2px;
  animation: audio-wave 0.5s ease infinite;
}

@keyframes audio-wave {
  0%,
  100% {
    transform: scaleY(0.3);
  }

  50% {
    transform: scaleY(1);
  }
}

@media (max-width: 600px) {
  .content {
    padding: 20px;
  }

  h1 {
    font-size: 2rem;
  }

  textarea {
    height: 120px;
  }

  .output {
    flex-direction: column;
    align-items: flex-start;
    gap: 15px;
  }

  .audio-controls {
    flex-direction: column;
  }

  .audio-controls button {
    width: 100%;
  }
}