/* global styles */

* {
    box-sizing: border-box;
}

:root {
    --font-color: #e8f1ed;
    --background-color: #0b312c;
    --tile-bottom-right-color: #eec;
    --tile-top-left-color: #eef;
    --tile-hover-color: #ee7;
    --tile-alert-color: #ff0;
    --tile-border-color: #555;
    --tile-back-color: #888;
    --link-color: #a9d7c9;
    --button-color: #146b5d;
    --button-hover-color: #1d806f;
    --base-width: 1000px;
    --base-height: 700px;
}

body {
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    font-weight: 300;
    font-size: 18px;
    background-color: var(--background-color);
    color: var(--font-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
    background-image: radial-gradient(circle at 50% 35%, #174b43 0, #0b312c 48%, #071f1c 100%);
}

strong {
    font-weight: 600;
}

/* wrapper */

#wrapper {
    position: absolute;
    top: 58px;
    left: 50%;
    transform: translateX(-50%) scale(var(--game-scale, 1));
    transform-origin: top center;
    width: var(--base-width);
}

/* header */

header {
    text-align: center;
    padding: 14px 0;
    font-size: 24px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* main */

main {
    position: relative;
}

/* footer */

footer {
    padding-top: 15px;
}

#statusText {
    float: left;
}

#controls {
    float: right;
}

/* buttons */

button {
    min-height: 42px;
    border: 1px solid rgba(255, 255, 255, 0.22);
    outline: none;
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
    color: var(--font-color);
    background-color: var(--button-color);
    padding: 8px 16px;
    margin-left: 10px;
    border-radius: 7px;
    transition: background-color 100ms linear, border-color 100ms linear;
}

button:hover {
    cursor: pointer;
    background-color: var(--button-hover-color);
}

/* infotext */

#infoText {
    height: 100%;
    display: none;
    position: absolute;
    z-index: 1;
    padding: 0px 150px;
    text-align: justify;
    font-size: 20px;
}

#infoText a {
    color: var(--link-color);
    text-decoration: none;
}

#infoText a:hover {
    color: var(--tile-alert-color);
}

#infoText img {
    width: 52px;
    border-radius: 5px;
    background-image: linear-gradient(
        to left top,
        var(--tile-bottom-right-color),
        var(--tile-top-left-color)
    );
    transition: transform 150ms ease;
    border: 2px solid var(--background-color);
    margin: 0px 5px;
}

#infoText img:hover {
    transform: scale(1.2);
}

/* game */

#game {
    height: var(--base-height);
    background: radial-gradient(circle at 50% 36%, #e7eee9 0, #cbdad3 52%, #91afa4 100%);
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    opacity: 0;
}

/* tile */

.tile {
    position: absolute;
}

.tileFront {
    position: absolute;
    background-image: linear-gradient(
        to left top,
        var(--tile-bottom-right-color),
        var(--tile-top-left-color)
    );
    border: 1px solid var(--tile-border-color);
}

.tileFront:hover {
    cursor: pointer;
    background-image: linear-gradient(
        to left top,
        var(--tile-hover-color),
        var(--tile-hover-color)
    );
}

.selectedTile {
    background-image: linear-gradient(
        to left top,
        var(--tile-hover-color),
        var(--tile-hover-color)
    );
}

.alertTile {
    background-image: linear-gradient(
        to left top,
        var(--tile-alert-color),
        var(--tile-alert-color)
    );
}

.tileBack {
    position: absolute;
    background-color: var(--tile-back-color);
    border: 1px solid var(--tile-border-color);
}

@media (max-width: 560px) {
    header { padding: 10px 0; font-size: 18px; }
    #wrapper { top: 46px; }
    footer { padding-top: 12px; }
}