:root {
    --primary-color: #0f172a;
    --primary-hover: #1e293b;
    --bg-color: #f1f5f9;
    --card-bg: #ffffff;
    --text-main: #334155;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --radius: 8px;
    --error-color: #ef4444;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.login-container {
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 1rem;
}

.login-card {
    background-color: var(--card-bg);
    width: 100%;
    max-width: 400px;
    padding: 2.5rem;
    border-radius: var(--radius);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.login-header h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.alert-error {
    background-color: #fef2f2;
    color: var(--error-color);
    padding: 0.75rem;
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    text-align: center;
    border: 1px solid #f87171;
}

.input-group {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
}

.input-group label {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.input-group input {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;