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

body {
    background: linear-gradient(135deg, var(--blue-500) 0%, var(--blue-700) 100%);
    min-height: 100vh;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.main-container {
    width: 100%;
    max-width: 480px;
}

.header-section {
    background: white;
    border-radius: 20px;
    padding: 35px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.2);
    position: relative;
    overflow: hidden;
}

.header-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, #667eea, #764ba2);
}

.login-header {
    text-align: center;
    margin-bottom: 30px;
}

.login-logo {
    max-width: 220px;
    margin-bottom: 15px;
}

.login-header h2 {
    color: #667eea;
    font-size: 2.2rem;
    font-weight: bold;
    margin-bottom: 10px;
}

.login-header p {
    color: #6c757d;
    font-size: 1.1rem;
}

.form-control {
    border-radius: 10px;
    padding: 12px;
    border: 1px solid #e0e0e0;
    background-color: #f8f9fa;
    height: auto;
}

.form-control:focus {
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    border-color: #667eea;
    background-color: #fff;
}

.input-group-text {
    background: white;
    border: 1px solid #e0e0e0;
    color: #667eea;
    padding: 12px 15px;
}

.input-group > .form-control {
    border-radius: 0 10px 10px 0;
    border-left: 0;
}

.input-group > .input-group-text {
    border-radius: 10px 0 0 10px;
    border-right: 0;
}

.btn-login {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 15px;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: bold;
    width: 100%;
    transition: all 0.3s ease;
    margin-top: 20px;
    box-shadow: 0 5px 15px rgba(118, 75, 162, 0.3);
}

.btn-login:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(118, 75, 162, 0.4);
    color: white;
}

.alert {
    border-radius: 10px;
    font-size: 0.9rem;
}