:root {
    --header-backgroundcolor: #001d33;
    --header-color: #888;

    --main-backgroundcolor: #0c101b;

    --main-error-page-color: #cbcbd1;

    --form-backgroundcolor: #171e28;
    --form-color: #cbcbd1;
    --form-shadow-color: rgba(0, 0, 0, 0.6);
    --form-elements-color: #000000;
    --form-elements-border-color: #171e28;
    --form-elements-shadow-color: rgba(0, 0, 0, 0.5);
    --form-button-backgroundcolor: #852aff;
    --form-button-backgroundcolor-hover: #ff007f;
    --form-button-backgroundcolor-disabled: #6d6c88;
    --form-error-backgroundcolor: #611313;
    --form-info-backgroundcolor: #346b0f;
    --form-download-backgroundcolor: #4199cc;
    --form-retry-backgroundcolor: #346b0f;
    --form-selection-option-backgroundcolor-blue: #006dbe;
    --form-selection-option-backgroundcolor-blue-hover: #1e9eff;
    --form-selection-option-backgroundcolor-purple: #852aff;
    --form-selection-option-backgroundcolor-purple-hover: #aa2cb3;
    --form-selection-option-backgroundcolor-red: #670d2f;
    --form-selection-option-backgroundcolor-red-hover: #a53860;
    --form-selection-option-backgroundcolor-green: #239a5e;
    --form-selection-option-backgroundcolor-green-hover: #5bb684;

    --footer-backgroundcolor: #001d33;
    --footer-color: #888;
}

body {
    min-height: 100vh;
    margin: 0;
    padding: 0;

    display: flex;
    flex-direction: column;
    justify-content: center;

    font-family: 'Open Sans', Helvetica, Arial, Lucida, sans-serif;
}

.header {
    min-height: 50px;
    background-color: var(--header-backgroundcolor);
    color: var(--header-color);
    display: flex;
    justify-content: space-between;
    z-index: 100;
}

.header-image {
    flex-grow: 1;
    flex-basis: 0;
    height: 50px;

    img {
        height: 40px;
        width: 40px;
        margin: 5px;
    }
}

.header-text {
    text-align: center;

    a, a:hover, a:focus, a:active {
        text-decoration: none;
        color: inherit;
    }
}

.header-logout {
    flex-grow: 1;
    flex-basis: 0;
    justify-content: flex-end;

    display: flex;
    align-items: center;

    button {
        margin: 0 20px;
        border: none;
        background: none;
        text-align: left;
        color: inherit;
        font-size: inherit;
        cursor: pointer;
    }
}

.main {
    flex: 1;
    background-color: var(--main-backgroundcolor);
    display: flex;
    justify-content: center;
    align-items: center;
}

.footer {
    min-height: 50px;
    background-color: var(--footer-backgroundcolor);
    color: var(--footer-color);
    text-align: center;
    z-index: 100;

    a, a:hover, a:focus, a:active {
        text-decoration: none;
        color: inherit;
    }
}

.error-page {
    color: var(--form-color);
    text-align: center;

    h1 {
        font-size: 8em;
    }

    p {
        font-size: 3em;
    }
}

.form {
    background-color: var(--form-backgroundcolor);
    min-width: 250px;
    max-width: 320px;
    margin-top: 50px;
    margin-bottom: 50px;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px var(--form-shadow-color);
    color: var(--form-color);
}

.form h2 {
    text-align: center;
    margin-bottom: 30px;
}

.form label, .form .label {
    display: block;
    margin-bottom: 8px;
}

.form input {
    color: var(--form-elements-color);
}

.form input:not([type=checkbox]) {
    border: 1px solid var(--form-elements-border-color);
    box-shadow: 0 0 10px var(--form-elements-shadow-color);
    background-color: var(--form-color);
    border-radius: 4px;
    box-sizing: border-box;
}

.form input[type=checkbox] {
    box-sizing: border-box;
    width: 1.4em;
    height: 1.4em;
}

.form input[type=file]::file-selector-button {
    display: none;
}

.form select {
    border: 1px solid var(--form-elements-border-color);
    box-shadow: 0 0 10px var(--form-elements-shadow-color);
    background-color: var(--form-color);
    border-radius: 4px;
    box-sizing: border-box;
}

.form button {
    background-color: var(--form-button-backgroundcolor);
    box-shadow: 0 0 10px var(--form-elements-shadow-color);
    color: var(--form-color);
    margin-top: 15px;
    padding: 15px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s;
}

.form button:hover {
    background-color: var(--form-button-backgroundcolor-hover);
}

.form button:disabled {
    background-color: var(--form-button-backgroundcolor-disabled);
}

.form :where(input:not([type=checkbox]), select, button) {
    width: 100%;
}

.form :where(input, select) {
    padding: 8px;
    margin-bottom: 16px;
}

.form .error-message {
    background-color: var(--form-error-backgroundcolor);
    color: var(--form-color);
    padding: 5px;
    margin-bottom: 10px;
    border-radius: 4px;
    text-align: center;
}

.form .info-message {
    background-color: var(--form-info-backgroundcolor);
    color: var(--form-color);
    padding: 5px;
    margin-bottom: 10px;
    border-radius: 4px;
    text-align: center;
}

.form .download-message {
    background-color: var(--form-download-backgroundcolor);
    color: var(--form-color);
    padding: 5px;
    margin-bottom: 10px;
    border-radius: 4px;
    text-align: center;
    font-weight: bold;
}

.form .retry-message {
    background-color: var(--form-retry-backgroundcolor);
    color: var(--form-color);
    padding: 5px;
    margin-bottom: 10px;
    border-radius: 4px;
    text-align: center;
    font-weight: bold;

    a, a:hover, a:focus, a:active {
        text-decoration: none;
        color: inherit;
    }
}

.form .selection-option {
    color: var(--form-color);
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 4px;
    text-align: center;
    font-size: 1.25em;
    transition: background-color 0.3s;

    a, a:hover, a:focus, a:active {
        text-decoration: none;
        color: inherit;
    }
}

.form .color-blue {
    background-color: var(--form-selection-option-backgroundcolor-blue);
}

.form .color-blue:hover {
    background-color: var(--form-selection-option-backgroundcolor-blue-hover);
}

.form .color-purple {
    background-color: var(--form-selection-option-backgroundcolor-purple);
}

.form .color-purple:hover {
    background-color: var(--form-selection-option-backgroundcolor-purple-hover);
}

.form .color-red {
    background-color: var(--form-selection-option-backgroundcolor-red);
}

.form .color-red:hover {
    background-color: var(--form-selection-option-backgroundcolor-red-hover);
}

.form .color-green {
    background-color: var(--form-selection-option-backgroundcolor-green);
}

.form .color-green:hover {
    background-color: var(--form-selection-option-backgroundcolor-green-hover);
}

.loading-overlay {
    position: fixed;
    display: none;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(128, 128, 128, 0.35);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    cursor: progress;
    opacity: 0;
    z-index: 10;

    .loading-overlay-center {
        display: flex;
        width: 100%;
        height: 100%;
        justify-content: center;
        align-items: center;
    }
}

.loading-overlay-fade-in {
    transition: opacity 1.5s;
    opacity: 1;
}

.loading-overlay .loading-spinner {
    position: relative;
    width: 110px;
    height: 110px;
    margin: auto;
}

.loading-overlay .loading-spinner .loading-spinner-ball {
    position: absolute;
    width: 105px;
    height: 105px;
    opacity: 0;
    transform: rotate(225deg);
    animation: loading-spinner-orbit 6.96s infinite;
}

.loading-overlay .loading-spinner .loading-spinner-ball .loading-spinner-inner-ball {
    position: absolute;
    width: 14px;
    height: 14px;
    background: rgb(0, 0, 0);
    left: 0;
    top: 0;
    border-radius: 14px;
}

.loading-overlay .loading-spinner .loading-spinner-ball-1 {
    animation-delay: 1.52s;
}

.loading-overlay .loading-spinner .loading-spinner-ball-2 {
    animation-delay: 0.3s;
}

.loading-overlay .loading-spinner .loading-spinner-ball-3 {
    animation-delay: 0.61s;
}

.loading-overlay .loading-spinner .loading-spinner-ball-4 {
    animation-delay: 0.91s;
}

.loading-overlay .loading-spinner .loading-spinner-ball-5 {
    animation-delay: 1.22s;
}

@keyframes loading-spinner-orbit {
    0% {
        opacity: 1;
        z-index: 99;
        transform: rotate(180deg);
        animation-timing-function: ease-out;
    }

    7% {
        opacity: 1;
        transform: rotate(300deg);
        animation-timing-function: linear;
    }

    30% {
        opacity: 1;
        transform: rotate(410deg);
        animation-timing-function: ease-in-out;
    }

    39% {
        opacity: 1;
        transform: rotate(645deg);
        animation-timing-function: linear;
    }

    70% {
        opacity: 1;
        transform: rotate(770deg);
        animation-timing-function: ease-out;
    }

    75% {
        opacity: 1;
        transform: rotate(900deg);
        animation-timing-function: ease-out;
    }

    76% {
        opacity: 0;
        transform: rotate(900deg);
    }

    100% {
        opacity: 0;
        transform: rotate(900deg);
    }
}