* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}

/* theme variables */
/* normal */
body.theme-normal {
    --bg-main: #ffffff;
    --bg-sidebar: #dddddd;
    --text-main: #222222;
    --btn-bg: #ffffff;
    --board-light: #F5F5DC; /* BEIGE */
    --board-dark: #A52A2A;  /* BROWN */
    --move-even: #FFFFFF;
    --move-odd: #F2F2F2;
}

/* Dark Theme[cite: 2, 3] */
body.theme-dark {
    --bg-main: #1a1a1a;
    --bg-sidebar: #222222;
    --text-main: #ffffff;
    --btn-bg: #3a3a3a;
    --board-light: rgb(70, 70, 70);
    --board-dark: rgb(40, 40, 40);
    --move-even: #2A2A2A;
    --move-odd: #1F1F1F;
}

/* Pineapple Theme[cite: 2, 3] */
body.theme-pineapple {
    --bg-main: #fcea9f;
    --bg-sidebar: #FFDE59;
    --text-main: #222222;
    --btn-bg: #fff09d;
    --board-light: rgb(253, 221, 122);
    --board-dark: #87d0a5;
    --move-even: #FFF3C4;
    --move-odd: #FFEAA7;
}

/* layout */
body {
    background-color: var(--bg-main);
    color:var(--text-main);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    width: 100%;
    height: 100%;
}

/* sidebar traslation */
.sidebar {
    width: 200px;
    background-color: var(--bg-sidebar);
    border-right:1px solid black;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
}

.ui-btn {
    width: 100%;
    background-color: var(--btn-bg);
    color: var(--text-main);
    border: 1px solid black;
    border-radius: 6px;
    padding: 8px 12px;
    font-size: 16px;
    cursor: pointer;
}

.ui-btn:hover {
    filter: brightness(0.9);
}

/* boardview translation */

.main-content {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    gap: 20px;
}

.board-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
}

.chessboard {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(8, 1fr);
    width: 80vmin;
    height: 80vmin;
    max-width: 640px;
    max-height: 640px;
    border: 2px solid var(--text-main);
}

.square {
    display: flex;
    justify-content: center;
    align-items: center;
}

.square.light { background-color: var(--board-light); }
.square.dark { background-color: var(--board-dark); }
.square.highlight { position: relative; }
.square.highlight::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 255, 0, 0.3);
}

.square img {
    width: 80%;
    height: 80%;
    pointer-events: none;
}


/* Move List */


.move-list-container {
    width: 200px;
    height: 80vmin;
    max-height: 640px;
    background-color: var(--bg-main);
    border-left: 1px solid black;
    overflow-y: auto;
}

.move-list {
    list-style: none;
}

.move-list li {
    padding: 8px 12px;
    font-size: 16px;
    color: var(--text-main);
}

.move-list li:nth-child(even) {background-color: var(--move-even);}
.move-list li:nth-child(odd) { background-color: var(--move-odd); }




/* Overlays & popups */
.overlay {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}

.hidden { display: none !important; }

.popup-box {
    background-color:  var(--bg-main);
    color: var(--text-main);
    padding: 20px;
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    align-items: center;
    min-width: 300px;
    border: 2px solid var(--text-main);
}

/* Specific border override for Pineapple popup[cite: 2] */
body.theme-pineapple .popup-box {
    border-color: #F1C40F;
}

.popup-row {
    display: flex;
    gap: 10px;
    align-items: center;
}

.square.legal-target::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background-color: rgba(0, 200, 0, 0.6);
    border-radius: 50%;
}