:root {
    --primary-color: #337ab7;
    --secondary-color: #2a9d8f;
    --light-color: #f8f9fa;
    --dark-color: #6c757d;
    --max-width: 1100px;
}

/* buttons */
.btn {
    padding: 0.4rem 1.6rem;
    display: inline-block;
    border: none;
    color: #fff;
    color: #fff;
}

.btn-light { background-color: var(--light-color); }
.btn-dark { background-color: #337ab7 }
.btn-primary { background-color: #199595; }

.btn:hover {
    opacity: 0.8;
}

.btn-block {
    width: 100%;
    display: block;
    text-align: center;
}

/* background-color */
.bg-primary {
    color: #fff;
    background-color: var(--primary-color);
}

.bg-secondary {
    color: #fff;
    background-color: var(--secondary-color) !important;
}

.bg-light {
    color: var(--dark-color);
    background-color: var(--light-color);
}

.bg-dark {
    color: var(--light-color);
    background-color: var(--dark-color);
}

/* paddings */
.p-1 { padding: 0.5rem; }
.p-2 { padding: 0.6rem; }
.p-3 { padding: 0.8rem; }
.p-4 { padding: 1rem; }

.pt-1 { padding-top: 0.5rem; }
.pt-2 { padding-top: 0.6rem; }
.pt-3 { padding-top: 0.8rem; }
.pt-4 { padding-top: 1rem; }

.py-1 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-2 { padding-top: 0.6rem; padding-bottom: 0.6rem; }
.py-3 { padding-top: 0.8rem; padding-bottom: 0.8rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }

.px-1 { padding-right: 0.5rem; padding-left: 0.5rem; }
.px-2 { padding-right: 0.6rem; padding-left: 0.6rem; }
.px-3 { padding-right: 0.8rem; padding-left: 0.8rem; }
.px-4 { padding-right: 1rem; padding-left: 1rem; }

/* margins */
.m-1 { margin: 0.5rem;}
.m-2 { margin: 0.6rem; }
.m-3 { margin: 0.8rem; }
.m-4 { margin: 1rem; }

/* container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* card */
.card {
    padding: 1rem;
    background-color: #fdfff3;
}

.card-primary {
    padding: 1rem;
    color: #fff;
    background-color: var(--primary-color);
}

/* card-category */
.category {
    display: inline-block;
    color: #fff;
    font-size: 1.2rem;
    letter-spacing: 1px;
    padding: 0.4rem 0.6rem;
    border-radius: 15px;
    margin-bottom: 0.5rem;
}