:root {
  --primary-color: #6200ee;
  --primary-variant: #3700b3;
  --secondary-color: #03dac6;
  --background-color: #f5f5f5;
  --surface-color: #ffffff;
  --error-color: #b00020;
  --text-primary: #000000;
  --text-secondary: #666666;
  --spacing-unit: 8px;
  --border-radius: 8px;
  --box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1), 0 4px 8px rgba(0, 0, 0, 0.1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary-color: #bb86fc;
    --primary-variant: #3700b3;
    --secondary-color: #03dac6;
    --background-color: #121212;
    --surface-color: #1e1e1e;
    --error-color: #cf6679;
    --text-primary: #ffffff;
    --text-secondary: #aaaaaa;
  }
}

body {
  font-family: 'Roboto', 'Inter', sans-serif;
  background-color: var(--background-color);
  color: var(--text-primary);
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
}

header {
  background-color: var(--surface-color);
  width: 100%;
  padding: calc(var(--spacing-unit) * 2);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
  display: flex;
  justify-content: center;
  align-items: center;
}

h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 500;
}

main {
  width: 100%;
  max-width: 1200px;
  padding: calc(var(--spacing-unit) * 3);
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing-unit) * 3);
}

.controls-card {
  background-color: var(--surface-color);
  padding: calc(var(--spacing-unit) * 3);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--spacing-unit) * 2);
  align-items: center;
  justify-content: center;
}

button {
  background-color: var(--primary-color);
  color: #ffffff;
  border: none;
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.2s ease, opacity 0.2s ease;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

button:hover:not(:disabled) {
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  transform: translateY(-1px);
}

button:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

button:disabled {
  background-color: var(--text-secondary);
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

button.secondary {
  background-color: transparent;
  border: 1px solid var(--primary-color);
  color: var(--primary-color);
}

button.secondary:hover:not(:disabled) {
  background-color: rgba(98, 0, 238, 0.04);
}

button.danger {
  background-color: var(--error-color);
}

.video-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--spacing-unit) * 3);
  /* Center the single preview video */
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

.recordings-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: calc(var(--spacing-unit) * 3);
  width: 100%;
}

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

.video-container {
  background-color: var(--surface-color);
  border-radius: var(--border-radius);
  padding: var(--spacing-unit);
  box-shadow: var(--box-shadow);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-unit);
}

.video-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 var(--spacing-unit);
}

.video-header h2 {
  font-size: 1.1rem;
  margin: 0;
  color: var(--text-secondary);
  font-weight: 500;
}

video {
  width: 100%;
  border-radius: calc(var(--border-radius) / 2);
  background-color: #000;
  aspect-ratio: 16 / 9;
}

.volume-meter-container {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.volume-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.volume-meter {
  width: 100%;
  height: 8px;
  background-color: rgba(0, 0, 0, 0.1);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

@media (prefers-color-scheme: dark) {
  .volume-meter {
    background-color: rgba(255, 255, 255, 0.1);
  }
}

.volume-level {
  height: 100%;
  width: 0%;
  background-color: var(--secondary-color);
  transition: width 0.1s linear;
}

.status-bar {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
  min-height: 1.2em;
}

.download-link {
  display: inline-block;
  margin-top: var(--spacing-unit);
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

.download-link:hover {
  text-decoration: underline;
}

.hidden {
  display: none !important;
}