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

body {
    background-color: #a5a4a4;
    font-family: Arial, sans-serif;
}

/* Login container */
.login-container {
    min-height: calc(100vh - 80px);
    display: flex;
    justify-content: center;
    align-items: center;
    padding-top: 20px;
    padding-bottom: 20px;
}

.login-box {
    background: whitesmoke;
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: 0 0 15px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 500px;
}

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

.login-header header {
    color: #333;
    font-size: 25px;
    font-weight: 600;
}

.input-box {
    margin-bottom: 20px;
}

.input-field {
    width: 100%;
    height: 50px;
    padding: 0 20px;
    font-size: 16px;
    border-radius: 8px;
    border: none;
    box-shadow: 0px 5px 10px 8px rgba(0,0,0,0.1);
    outline: none;
    transition: .3s;
}

.input-field::placeholder {
    font-weight: 500;
    color: #555;
}

.forgot {
    text-align: center;
    margin-bottom: 15px;
}

.forgot a {
    font-size: 15px;
    color: #555;
    text-decoration: none;
}

.forgot a:hover {
    text-decoration: underline;
}

.input-submit {
    position: relative;
    margin-bottom: 20px;
}

.submit-btn {
    width: 100%;
    height: 50px;
    background-color: #222;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: .3s;
}

.submit-btn:hover {
    background: #000;
    transform: scale(1.02);
}

.input-submit label {
    position: absolute;
    top: 50%;
    left: 50%;
    color: #fff;
    font-weight: bold;
    transform: translate(-50%, -50%);
    cursor: pointer;
    pointer-events: none;
}

.sign-up-link {
    text-align: center;
    font-size: 15px;
}

.sign-up-link a {
    color: #000;
    font-weight: 600;
}

/* Responsive login-box padding ayarı */
@media (max-width: 576px) {
    .login-box {
        padding: 30px 20px;
    }
    .login-header header {
        font-size: 24px;
    }
    .input-field {
        height: 45px;
    }
    .submit-btn {
        height: 45px;
    }
}

.error-message {
    color: #dc3545;
    font-size: 0.875em;
    margin-top: 0.25rem;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
    padding: 0.75rem 1.25rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: 0.25rem;
}