:root {
  /* Premium Dark Palette */
  --bg-app: #0f172a; /* Slate 900 */
  --bg-surface: #1e293b; /* Slate 800 */
  --bg-surface-hover: #334155; /* Slate 700 */

  --text-primary: #f8fafc; /* Slate 50 */
  --text-secondary: #94a3b8; /* Slate 400 */

  --primary-color: #38bdf8; /* Sky 400 */
  --primary-hover: #0ea5e9; /* Sky 500 */

  --accent-color: #c084fc; /* Purple 400 */

  --border-color: #334155;

  --danger-color: #ef4444;

  --radius-md: 12px;
  --radius-lg: 16px;

  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-app);
  color: var(--text-primary);
  font-family: var(--font-family);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

* {
  box-sizing: border-box;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 600;
}

/* Utilities */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  font-family: inherit;
  font-size: 0.95rem;
  gap: 8px;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #0f172a;
  /* Slate 900 for contrast */
}

.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-secondary {
  background-color: var(--bg-surface-hover);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: #475569;
  /* Slate 600 */
}

.btn-icon {
  padding: 8px;
  aspect-ratio: 1;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 16px;
  text-align: left;
}

.label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.input,
.select,
.textarea {
  background-color: var(--bg-app);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1rem;
  width: 100%;
  transition: border-color 0.2s;
}

.input:focus,
.select:focus,
.textarea:focus {
  outline: none;
  border-color: var(--primary-color);
}

/* Card Utility */
.card {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
}