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

html, body {
    height: 100%;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #ffffff;
}

.login-container {
    background: white;
    padding: 60px 50px;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.1);
    width: 450px;
    text-align: center;
    border: 1px solid #f0f0f0;
}

.logo-container {
    margin-bottom: 10px;
}

.logo-container img {
    max-height: 120px;
    width: auto;
}

.input-group {
    position: relative;
    margin: 25px 0;
}

input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 15px 20px;
    border: 2px solid #e1e8ed;
    border-radius: 10px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: #fff;
    color: #333;
}

input::placeholder {
    color: #999;
}

input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

button#login-btn {
    width: 100%;
    padding: 15px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    margin-top: 25px;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

button#login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
    background: #5a6fd8;
}

button#login-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

@media (max-width: 520px) {
    .login-container {
        width: 92%;
        padding: 40px 28px;
    }
    .logo-container img {
        max-height: 90px;
    }
}