:root {
    --dark-gray: #242424;
    --medium-dark-gray: #333;
    --medium-gray: #444;
    --gray: #777;
    --light-gray: #aaa;
    --red: #EE0000;
    --green: #449e48;
    --strong-green: #33d83b;
    --blue: #0058A9;
    --strong-blue: #0011ee;
    --white: #FFF;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Lato", sans-serif;
    scrollbar-color: var(--gray) var(--medium-dark-gray);
}

body {
    background-color: var(--dark-gray);
}

.hidden {
    display: none !important;
}


/* index page */

.index-div {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -75%);

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    
    max-width: 36rem;
    color: var(--light-gray);
}

.index-div h1 {
    color: var(--white);
    font-size: 3rem;
    margin: 1rem;
}

.index-div p {
    font-size: 1.25rem;
    margin: 1rem;
    text-align: center;
}

.index-div a {
    color: var(--light-gray);
    text-decoration: none;
    font-size: 1.5rem;
}
.index-div a:hover {
    color: var(--white);
    text-decoration: underline;
}

.index-div li {
    list-style: none;
    
    margin: 1rem 0.25rem;
}

footer {
    position: absolute;
    bottom: 0.5rem;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--light-gray);
    font-size: 0.75rem;
}

footer a {
    color: var(--light-gray);
}

footer a:hover {
    color: var(--white);
}

/* fluxogram */

#fluxograma {
    display: flex;
    flex-direction: row;
}

.period {
    display: flex;
    flex-direction: column;
}

.subject {
    position: relative;
    color: var(--white);
    border: 1px solid var(--medium-gray);
    min-width: 8rem;
    width: 12vw;
    max-width: 12rem;
    height: 5rem;
    display: flex;
    text-align: center;
    align-items: center;
    justify-content: center;
    margin: 1.4rem;
    background-color: var(--medium-gray);
    border-radius: 16px;
    box-shadow: 8px 8px 10px -6px rgba(0, 0, 0, 0.75);
}

h3 {
    font-size: 1rem;
}

.info-button {
    position: absolute;
    top: 0.25rem;
    right: 0.25rem;
    width: 1.25rem;
}

.subject:hover {
    cursor: pointer;
    color: var(--white);
    transition: 0.3s;
    transform: translateY(-10px);
}

.unlocked {
    background-color: var(--blue);
}

.finished {
    background-color: var(--green);
    color: var(--white);
}

.required {
    border: 4px solid var(--red);
}

.unlocks {
    border: 4px solid var(--white);
}

.active {
    border: none;
}

/* checkbox */

.check_period {
    display: flex;
    flex-direction: row;
    text-align: end;
    align-items: end;
    justify-content: center;
    margin-top: 2rem;
    color: var(--white);
}

.check-semester {
    position: relative;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;

    margin-right: 1rem;
    margin-top: 0.5rem;

    width: 1.75rem;
    height: 1.75rem;
    cursor: pointer;

    color: var(--dark-gray);
    background-color: var(--medium-gray);
    border: 1px solid var(--medium-gray);
    border-radius: 4px;
    box-shadow: 8px 8px 10px -6px rgba(0, 0, 0, 0.5);
}

.check-semester:checked {
    background-color: var(--green);
}

.check-semester:checked::before {
    content: "✔";
    font-size: 1.5rem;
    color: var(--white);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -55%);
}

/* sidebar */

.sidebar {
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;

    position: fixed;
    top: 50%;
    left: 100%;
    transform: translate(-100%, -50%);

    min-width: 18rem;
    max-width: 40vw;
    min-height: 12rem;
    max-height: 80vh;

    padding: 1rem;

    background-color: var(--dark-gray);
    border: 2px solid var(--medium-gray);
    border-radius: 1rem 0 0 1rem;
    color: var(--white);

    overflow-y: auto;
    overflow-x: hidden;
}


.sidebar h2 {
    margin: 0.5rem 3rem;
}

.close-btn {
    position: fixed;
    top: 0%;
    left: 100%;
    transform: translate(-100%, 0%);

    width: 40px;
    height: 40px;

    background-color: var(--dark-gray);
    border: none;
    border-bottom: none;
    border-radius: 50%;
    cursor: pointer;
}

.close-btn::before,
.close-btn::after {
    content: '';
    position: absolute;
    width: 25px;
    height: 2px;
    background-color: var(--light-gray);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(45deg);
}

.close-btn::after {
    transform: translate(-50%, -50%) rotate(-45deg);
}

.sidebar h2 {
    text-align: center;
}

.some-info,
.pre-requisitos,
.desbloqueia {
    margin: 0.5rem 1rem;
}

/* Add media query for mobile and tablet */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 90vw;
        height: auto;
        max-height: 80vh;
        border-radius: 1rem;

        z-index: 10;
        overflow-y: auto;
    }

    .close-btn {
        top: 0.75rem;
        right: 0.75rem;
        left: unset;
        transform: none;
    }
}

body.modal-active {
    overflow: hidden;
}

#modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.7);
    z-index: 9;
    display: none;
}

/* When modal is active */
body.modal-active #modal-overlay {
    display: block;
}

/* progress */

#progress-div {
    position: fixed;
    backface-visibility: hidden;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    margin: 0.5rem;
    padding: 0;
    width: 90%;
    z-index: 1;
    background-color: var(--dark-gray);
    border: 2px solid var(--medium-gray);
    border-radius: 1rem;
    box-shadow: 8px 8px 10px -6px rgba(0, 0, 0, 0.5);
}

#progress-bar {
    background-color: var(--green);
    height: 1.25rem;
    border-radius: 1rem;
    transition: width 0.5s ease-out;
}

#progress-text {
    position: fixed;
    color: var(--white);
    text-align: center;
    top: 0.125rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1rem;
    z-index: 2;
}

/* scrollbar */

::-webkit-scrollbar {
    width: .75rem;
    height: .75rem;
}

::-webkit-scrollbar-track,
::-webkit-scrollbar-corner {
    background: var(--medium-dark-gray);
}

::-webkit-scrollbar-thumb {
    background: var(--gray);
    border-radius: 2rem;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--medium-dark-gray);
}

::-webkit-resizer,
::-webkit-scrollbar-button {
    display: none;
}