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

:root {
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --bg-card: #242424;
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --error: #ef4444;
  --error-bg: rgba(239, 68, 68, 0.1);
  --border: #333333;
  --input-bg: #1a1a1a;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
}

.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.login-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2.5rem;
  width: 100%;
  max-width: 400px;
}

.login-card h1 {
  font-size: 1.75rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 0.25rem;
}

.login-card .subtitle {
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input::placeholder {
  color: var(--text-secondary);
  opacity: 0.6;
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.error-message {
  background-color: var(--error-bg);
  border: 1px solid var(--error);
  border-radius: 8px;
  color: var(--error);
  padding: 0.75rem 1rem;
  margin-bottom: 1.25rem;
  font-size: 0.875rem;
}

.error-message[hidden] {
  display: none;
}

.btn-primary {
  width: 100%;
  padding: 0.75rem 1.5rem;
  background-color: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s;
}

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

.btn-primary:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.3);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}