:root {
    --primary-color: #15B999;
    --secondary-color: #58585A;
    --bg-color: #F5F5F5;
    --text-color: #333;
    --button-hover: #0f876f;
    --shadow-color: rgba(0, 0, 0, 0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

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

.login-container {
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 10px var(--shadow-color);
    text-align: center;
    width: 100%;
    max-width: 400px;
}

.logo {
    width: 150px;
    margin-bottom: 15px;
    width: 150px;
    margin-bottom: 15px;
    -webkit-filter: drop-shadow(1px 1px 0 black)
    drop-shadow(-1px -1px 0 black);
    filter: drop-shadow(1px 1px 0 black) 
    drop-shadow(-1px -1px 0 black);
}

h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.8em;
}

.flash-messages {
    list-style: none;
    padding: 10px;
    margin-bottom: 15px;
}

.flash-messages li {
    padding: 12px;
    margin-bottom: 10px;
    border-radius: 5px;
    font-size: 0.9em;
}

.success { background-color: #15B999; color: white; }
.error { background-color: #D9534F; color: white; }

label {
    display: block;
    margin: 10px 0 5px;
    font-weight: 600;
    color: var(--secondary-color);
}

input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 1em;
    transition: border 0.3s;
}

input:focus {
    border-color: var(--primary-color);
    outline: none;
}

.btn-login {
    width: 100%;
    padding: 12px;
    margin-top: 15px;
    background-color: var(--primary-color);
    border: none;
    border-radius: 5px;
    color: white;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-login:hover {
    background-color: var(--button-hover);
}