:root {
    --primary-color: #2c3e50;
    --accent-color: #3498db;
    --bg-color: #f4f7f6;
    --text-color: #333;
    --error-color: #e74c3c;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
}

.login-container {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 400px;
    text-align: center;
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.login-container img {
    max-width: 150px;
    margin-bottom: 1.5rem;
}

.login-container h1 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 0.9rem;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus {
    border-color: var(--accent-color);
    outline: none;
    box-shadow: 0 0 8px rgba(52, 152, 219, 0.2);
}

.btn-login {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--accent-color);
    color: var(--white);
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-login:hover {
    background-color: #2980b9;
    transform: translateY(-1px);
}

.error-msg {
    background-color: #fde8e8;
    color: var(--error-color);
    padding: 0.75rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-size: 0.85rem;
    border: 1px solid #f9b4b4;
}