:root {
  --primary-color: #E95420;
  --secondary-color: #e0e0e0;
  --background-color: #121212;
  --card-bg: #1e1e1e;
  --border-color: #333333;
  --text-color: #e0e0e0;
  --disabled-color: #2a2a2a;
  --disabled-text: #666666;
  --success-color: #4caf50;
  --hover-color: #FF8A65;
  --separator-color: #444444;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
    Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
  padding: 0 20px;
}

#app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px 0;
}

header {
  text-align: center;
  margin-bottom: 40px;
}

header h1 {
  color: var(--primary-color);
  margin-bottom: 10px;
  font-weight: 700;
}

header p {
  color: var(--secondary-color);
  font-size: 1.1rem;
}

.calculator-container {
  display: flex;
  flex-direction: column;
  gap: 30px;
  background-color: var(--card-bg);
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  padding: 30px;
}

@media (min-width: 768px) {
  .calculator-container {
    flex-direction: row;
  }
}

.input-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

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

label {
  font-weight: 500;
  color: var(--secondary-color);
}

select, input {
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 1rem;
  transition: border-color 0.3s ease;
  background-color: #2a2a2a;
  color: var(--text-color);
}

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

select:focus, input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(212, 0, 0, 0.1);
}

select:disabled {
  background-color: var(--disabled-color);
  color: var(--disabled-text);
  cursor: not-allowed;
}

.results-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.result-card, .bitrate-card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 20px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.result-card h2, .bitrate-card h2 {
  font-size: 1.2rem;
  color: var(--secondary-color);
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border-color);
}

.result-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin: auto;
  text-align: center;
}

.result-placeholder {
  color: var(--disabled-text);
  font-style: italic;
  text-align: center;
  margin: auto;
}

.bitrate-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
  font-size: 1.1rem;
}

.bitrate-row .label {
  font-weight: 500;
}

.bitrate-row .value {
  font-weight: 700;
  color: var(--secondary-color);
}

.bitrate-separator {
  margin: 15px 0;
  border: 0;
  height: 1px;
  background-color: var(--separator-color);
  opacity: 0.8;
}

footer {
  margin-top: 40px;
  text-align: center;
  color: var(--secondary-color);
  font-size: 0.9rem;
}

footer .disclaimer {
  font-size: 0.8rem;
  margin-top: 5px;
  color: #666;
}

.tooltip {
  position: relative;
  display: inline-block;
  margin-left: 5px;
  cursor: help;
}

.tooltip .tooltip-text {
  visibility: hidden;
  width: 200px;
  background-color: #333;
  color: #fff;
  text-align: center;
  border-radius: 6px;
  padding: 5px;
  position: absolute;
  z-index: 1;
  bottom: 125%;
  left: 50%;
  margin-left: -100px;
  opacity: 0;
  transition: opacity 0.3s;
}

.tooltip:hover .tooltip-text {
  visibility: visible;
  opacity: 1;
}