:root {
  --bg-color: #0f172a;
  --sidebar-bg: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --border-color: #334155;
  --accent-color: #3b82f6;
  --accent-hover: #2563eb;
  --input-bg: #0f172a;
  --input-border: #475569;
  --font-family: 'Inter', sans-serif;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
}

.app-container {
  display: flex;
  height: 100%;
}

.sidebar {
  width: 350px;
  background-color: var(--sidebar-bg);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  overflow-y: auto;
}

header {
  margin-bottom: 2rem;
}

header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

header p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.form-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

input[type="number"] {
  background-color: var(--input-bg);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  padding: 0.5rem;
  border-radius: 0.375rem;
  font-family: inherit;
  font-size: 0.875rem;
  transition: border-color 0.2s ease;
}

input[type="number"]:focus {
  outline: none;
  border-color: var(--accent-color);
}

.checkbox-group {
  flex-direction: row;
  align-items: center;
}

.checkbox-group label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  margin-bottom: 0;
}

input[type="checkbox"] {
  accent-color: var(--accent-color);
  width: 1rem;
  height: 1rem;
}

button {
  background-color: var(--accent-color);
  color: #fff;
  border: none;
  padding: 0.75rem;
  border-radius: 0.375rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: background-color 0.2s ease;
  margin-top: 1rem;
}

button:hover {
  background-color: var(--accent-hover);
}

button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.loader {
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top: 2px solid #fff;
  width: 1rem;
  height: 1rem;
  animation: spin 1s linear infinite;
}

.hidden {
  display: none;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.viewer-container {
  flex: 1;
  background-color: var(--bg-color);
}

iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.advanced-mode {
  margin-top: 1.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-align: center;
}

.advanced-mode a {
  color: #60a5fa;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.advanced-mode a:hover {
  color: #93c5fd;
  text-decoration: underline;
}