:root {
    --board-size: 90vh;
    --square-size: calc(var(--board-size) / 8);
    --light-square: #e9edcc;
    --dark-square: #779556;
    --highlight-color: rgba(255, 255, 0, 0.5);
    --background-color: #2c2f33;
    --text-color: #ffffff;
    --panel-background: #23272a;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
}

.main-container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 30px;
}

/* --- PAPAN CATUR & KOORDINAT --- */
.board-container {
    display: grid;
    grid-template-areas: "rank board" ". file";
    grid-template-columns: auto 1fr;
    grid-template-rows: 1fr auto;
    width: var(--board-size);
    height: var(--board-size);
}

#chessboard {
    grid-area: board;
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(8, 1fr);
    border: 3px solid #1a1a1a;
}

.square {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: calc(var(--square-size) * 0.75);
    cursor: pointer;
    position: relative;
}

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

.piece-white { color: #ffffff; text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.8); }
.piece-black { color: #000000; }

.selected { background-color: var(--highlight-color) !important; }

.rank-labels, .file-labels {
    display: grid;
    font-weight: bold;
    color: #a0a0a0;
}
.rank-labels { grid-area: rank; grid-template-rows: repeat(8, 1fr); padding-right: 10px; }
.file-labels { grid-area: file; grid-template-columns: repeat(8, 1fr); padding-top: 10px; }
.rank-labels > div, .file-labels > div { display: flex; justify-content: center; align-items: center; }

/* --- PANEL INFO & KONTROL --- */
.info-panel {
    width: 300px;
    padding-left: 20px;
}
.info-panel h1 {
    margin-top: 0;
    border-bottom: 2px solid var(--dark-square);
    padding-bottom: 10px;
}

.controls-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

#lang-switcher, #mode-switcher { display: flex; gap: 5px; }

/* Pembaruan: Menambahkan #support-button ke selektor umum */
#lang-switcher button, #mode-switcher button, #reset-button, #support-button {
    background-color: #4f545c;
    color: white;
    border: 1px solid #333;
    padding: 8px 12px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.2s;
}

#lang-switcher button:hover, #mode-switcher button:hover, #reset-button:hover, #support-button:hover {
    background-color: #72767d;
}

#lang-switcher button.active, #mode-switcher button.active {
    background-color: var(--dark-square);
    box-shadow: 0 0 5px rgba(255, 255, 255, 0.4);
}

#reset-button { background-color: #c0392b; }
#reset-button:hover { background-color: #e74c3c; }

#undo-button { background-color: #3498db; }
#undo-button:hover { background-color: #5dade2; }
#undo-button:disabled { background-color: #566573; cursor: not-allowed; }

/* GAYA BARU: Untuk Tombol Dukung */
#support-button {
    background-color: #f1c40f;
    color: #333;
}
#support-button:hover {
    background-color: #f39c12;
}


/* --- MODE CUSTOM & PALET BIDAK --- */
.mode-section {
    background-color: var(--panel-background);
    padding: 15px;
    border-radius: 5px;
    margin-top: 20px;
}

#piece-palette {
    margin-top: 15px;
    border-top: 1px solid #4f545c;
    padding-top: 15px;
}

.turn-selector {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}
.turn-selector span {
    font-weight: bold;
    color: #a0a0a0;
}
.turn-selector button {
    background-color: #4f545c;
    color: white;
    border: 1px solid #333;
    padding: 5px 10px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.2s ease;
}
.turn-selector button.active {
    background-color: var(--dark-square);
    font-weight: bold;
    color: #fff;
    border-color: #fff;
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.5);
    transform: scale(1.05);
}

.palette-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 10px;
}

.palette-piece {
    background-color: var(--light-square);
    color: #000;
    border: 2px solid var(--dark-square);
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 30px;
    border-radius: 5px;
    cursor: pointer;
}
.palette-piece[data-piece^="P"], .palette-piece[data-piece^="R"], .palette-piece[data-piece^="N"],
.palette-piece[data-piece^="B"], .palette-piece[data-piece^="Q"], .palette-piece[data-piece^="K"] {
    color: #fff;
    text-shadow: 0 0 3px #000;
}

.palette-piece.selected-tool {
    box-shadow: 0 0 10px 3px var(--highlight-color);
    transform: scale(1.1);
}

/* --- BIDAK TERAMBIL --- */
.info-panel h2 {
    color: #e0e0e0;
    font-size: 1em;
    margin-bottom: 8px;
}
.captured-pieces-container { margin-top: 20px; }
.captured-box {
    background-color: var(--light-square);
    border-radius: 5px;
    padding: 10px;
    min-height: var(--square-size);
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    font-size: calc(var(--square-size) * 0.6);
    border: 2px solid var(--dark-square);
}

/* --- MODAL (UMUM, PROMOSI & DUKUNGAN) --- */
#promotion-modal, #support-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.75);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background-color: var(--background-color);
    padding: 20px 30px;
    border-radius: 10px;
    text-align: center;
    border: 2px solid var(--dark-square);
    position: relative;
    max-width: 400px;
}

.modal-content h3 {
    margin-top: 0;
    color: var(--text-color);
}

#promotion-choices {
    display: flex;
    gap: 15px;
}

#promotion-choices .promotion-piece {
    width: 60px;
    height: 60px;
    font-size: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--light-square);
    border: 2px solid var(--dark-square);
    border-radius: 5px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

#promotion-choices .promotion-piece:hover {
    transform: scale(1.1);
    box-shadow: 0 0 10px var(--highlight-color);
}

/* GAYA BARU: Untuk Modal Dukungan */
.close-button {
    position: absolute;
    top: 10px;
    right: 15px;
    background: none;
    border: none;
    font-size: 2em;
    color: #aaa;
    cursor: pointer;
}
#support-modal p {
    color: #ddd;
    line-height: 1.6;
}
#paypal-link-button {
    display: inline-block;
    background-color: #0070ba;
    color: white;
    padding: 12px 25px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    margin-top: 15px;
    transition: background-color 0.2s;
}
#paypal-link-button:hover {
    background-color: #005ea6;
}

/* --- Gaya untuk Penanda Gerakan Valid --- */
.valid-move-dot {
    position: absolute;
    width: 30%;
    height: 30%;
    background-color: rgba(46, 204, 113, 0.5);
    border-radius: 50%;
    box-shadow: 0 0 5px rgba(0,0,0,0.5);
    pointer-events: none;
}

/* --- Gaya untuk Notifikasi Skak --- */
#check-notifier {
    background-color: #e74c3c;
    color: white;
    font-weight: bold;
    text-align: center;
    padding: 6px;
    border-radius: 5px;
    margin-bottom: 15px;
    font-size: 1.1em;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.9); opacity: 1; }
    50% { transform: scale(0.92); opacity: 0.8; }
    100% { transform: scale(0.9); opacity: 1; }
}

/* --- Gaya untuk Raja yang sedang Skak --- */
.in-check {
    background-color: rgba(231, 76, 60, 0.5) !important;
    box-shadow: 0 0 10px 5px rgba(231, 76, 60, 0.7);
}


/* --- LAIN-LAIN --- */
.hidden { display: none !important; }

/* --- RESPONSIVE UNTUK MOBILE --- */
@media (max-width: 900px) {
    :root {
        --board-size: 95vw;
    }
    body {
        padding: 10px;
    }
    .main-container {
        flex-direction: column;
        align-items: center;
    }
    .info-panel {
        width: var(--board-size);
        padding-left: 0;
        text-align: center;
        margin-top: 20px;
    }
    .info-panel h1 {
        order: 2;
        margin-top: 20px;
    }
    .captured-pieces-container {
        order: 1;
    }
    #lang-switcher, #mode-switcher {
        justify-content: center;
    }
}