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

:root {
  --primary-color: #6366f1;
  --primary-hover: #4f46e5;
  --secondary-color: #ef4444;
  --secondary-hover: #dc2626;
  --bg-gradient-start: #667eea;
  --bg-gradient-end: #764ba2;
  --card-bg: #ffffff;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --border-color: #e5e7eb;
  --input-bg: #f9fafb;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md:
    0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg:
    0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

html {
  font-size: 16px;
}

body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  background: linear-gradient(
    135deg,
    var(--bg-gradient-start) 0%,
    var(--bg-gradient-end) 100%
  );
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  color: var(--text-primary);
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: 800px;
}

.voiceinator {
  background: var(--card-bg);
  border-radius: 1.5rem;
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
  animation: fadeIn 0.5s ease-in-out;
}

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

.header {
  text-align: center;
  margin-bottom: 2rem;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  background: linear-gradient(
    135deg,
    var(--primary-color) 0%,
    var(--bg-gradient-end) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.controls {
  display: grid;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.control-group label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#rateValue,
#pitchValue {
  color: var(--primary-color);
  font-weight: 700;
  font-size: 0.875rem;
}

select,
textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: 0.75rem;
  font-size: 1rem;
  font-family: inherit;
  background: var(--input-bg);
  color: var(--text-primary);
  transition: all 0.2s ease;
  cursor: pointer;
}

select:hover,
textarea:hover {
  border-color: var(--primary-color);
}

select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

textarea {
  resize: vertical;
  min-height: 150px;
  line-height: 1.6;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 0.5rem;
  border-radius: 0.25rem;
  background: var(--border-color);
  outline: none;
  transition: background 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: var(--shadow-md);
  transition: all 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  background: var(--primary-hover);
}

input[type="range"]::-moz-range-thumb {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: var(--shadow-md);
  transition: all 0.2s ease;
}

input[type="range"]::-moz-range-thumb:hover {
  transform: scale(1.1);
  background: var(--primary-hover);
}

.text-section {
  margin-bottom: 2rem;
}

.text-section label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.button-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  border: none;
  border-radius: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-md);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--primary-color) 0%,
    var(--primary-hover) 100%
  );
  color: white;
}

.btn-primary:hover {
  background: linear-gradient(
    135deg,
    var(--primary-hover) 0%,
    var(--primary-color) 100%
  );
}

.btn-secondary {
  background: linear-gradient(
    135deg,
    var(--secondary-color) 0%,
    var(--secondary-hover) 100%
  );
  color: white;
}

.btn-secondary:hover {
  background: linear-gradient(
    135deg,
    var(--secondary-hover) 0%,
    var(--secondary-color) 100%
  );
}

.btn svg {
  width: 20px;
  height: 20px;
}

@media (max-width: 640px) {
  body {
    padding: 1rem 0.75rem;
  }

  .voiceinator {
    padding: 1.5rem;
    border-radius: 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .button-group {
    grid-template-columns: 1fr;
  }

  .btn {
    width: 100%;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --card-bg: #1f2937;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --border-color: #374151;
    --input-bg: #111827;
  }

  select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23d1d5db' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  }
}

.footer {
  margin-top: 1rem;
  text-align: center;
}

.footer p {
  font-size: 0.875rem;
  color: #ffffff;
  font-weight: 500;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.footer a {
  color: #ffffff;
  text-decoration: none;
  font-weight: 700;
  transition: all 0.2s ease;
  padding: 0.25rem 0.25rem;
  border-radius: 0.375rem;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
}

.footer a:hover {
  background: rgba(255, 255, 255, 0.3);
  text-decoration: none;
  transform: translateY(-1px);
}