:root {
    --light-square: #eeeed2; 
    --dark-square: #769656;
    --selected-square: #baca44; 
    --last-move-square: rgba(247, 247, 105, 0.6);
    --check-square: #e74c3c; 
    --hint-color: rgba(0, 0, 0, 0.15); 
    --hint-capture: rgba(0, 0, 0, 0.1);
    --bg-color: #161513; 
    --panel-bg: #262421; 
    --accent: #81b64c;
}

body { 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    justify-content: center; 
    background-color: var(--bg-color); 
    color: #f1f1f1; 
    font-family: 'Segoe UI', system-ui, sans-serif; 
    margin: 0; 
    min-height: 100vh; 
}

.screen { 
    background: var(--panel-bg); 
    padding: 30px; 
    border-radius: 12px; 
    box-shadow: 0 10px 25px rgba(0,0,0,0.6); 
    text-align: center; 
    max-width: 450px; 
    width: 90%; 
    display: none; 
    flex-direction: column; 
    gap: 15px; 
}

#game-screen { 
    display: none; 
    flex-direction: column; 
    align-items: center; 
    background: none; 
    box-shadow: none; 
    max-width: 100%; 
    padding: 0; 
}

#status-panel { 
    font-size: 1.1rem; 
    margin-bottom: 10px; 
    font-weight: 600; 
    text-align: center; 
    color: #fff; 
    background: var(--panel-bg); 
    padding: 10px 24px; 
    border-radius: 24px; 
}

#game-container { 
    display: flex; 
    gap: 25px; 
    flex-wrap: wrap; 
    justify-content: center; 
}

.player-header { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    background: #1a1917; 
    padding: 8px 15px; 
    border-radius: 6px; 
    margin-bottom: 5px; 
    font-weight: bold; 
}

.header-user-info { 
    display: flex; 
    align-items: center; 
    gap: 10px; 
}

.game-avatar { 
    width: 32px; 
    height: 32px; 
    border-radius: 4px; 
    object-fit: cover; 
    background: #444; 
}

.timer { 
    font-family: monospace; 
    font-size: 1.5rem; 
    color: #fff; 
    background: #333; 
    padding: 4px 10px; 
    border-radius: 4px; 
}

.timer.low { 
    color: #e74c3c; 
    animation: pulse-time 1s infinite; 
}

@keyframes pulse-time { 
    0% { opacity: 1; } 
    50% { opacity: 0.5; } 
    100% { opacity: 1; } 
}

#board { 
    display: grid; 
    grid-template-columns: repeat(8, 72px); 
    grid-template-rows: repeat(8, 72px); 
    border: 6px solid var(--panel-bg); 
    border-radius: 6px; 
}

.square { 
    width: 72px; 
    height: 72px; 
    display: flex; 
    justify-content: center; 
    align-items: center; 
    position: relative; 
    user-select: none; 
    cursor: pointer; 
}

.white-square { background-color: var(--light-square); } 
.black-square { background-color: var(--dark-square); }
.selected { background-color: var(--selected-square) !important; }
.last-move { background-color: var(--last-move-square) !important; }
.in-check { background-color: var(--check-square) !important; animation: pulse-check 1.5s infinite; }

@keyframes pulse-check { 
    0% { opacity: 1; } 
    50% { background-color: #c0392b; } 
    100% { opacity: 1; } 
}

/* Profesjonalna, płynna animacja poruszania figur */
.piece-container { 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    justify-content: center; 
    position: relative; 
    width: 100%; 
    height: 100%; 
    z-index: 1; 
    transition: transform 0.28s cubic-bezier(0.175, 0.885, 0.32, 1.15), opacity 0.2s ease-in-out; 
}

.piece-owner { 
    position: absolute; 
    top: 1px; 
    font-size: 8px; 
    font-weight: bold; 
    padding: 1px 4px; 
    border-radius: 4px; 
    text-transform: uppercase; 
    pointer-events: none; 
    letter-spacing: 0.3px; 
    line-height: 1; 
    white-space: nowrap; 
    box-shadow: 0 1px 3px rgba(0,0,0,0.3); 
}

.owner-white { background: #ffffff; color: #000; border: 1px solid #ccc; }
.owner-black { background: #262421; color: #fff; border: 1px solid #444; }

.piece { 
    width: 54px; 
    height: 54px; 
    margin-top: 10px; 
}

.piece-black { 
    filter: brightness(0.45) contrast(1.1) drop-shadow(0px 2px 4px rgba(0,0,0,0.6)); 
} 

.hint { 
    width: 22px; 
    height: 22px; 
    background-color: var(--hint-color); 
    border-radius: 50%; 
    position: absolute; 
    z-index: 2; 
    pointer-events: none; 
}

.hint-capture { 
    width: 58px; 
    height: 58px; 
    border: 6px solid var(--hint-capture); 
    border-radius: 50%; 
    position: absolute; 
    z-index: 2; 
    pointer-events: none; 
}

#side-panel { 
    width: 260px; 
    background: var(--panel-bg); 
    padding: 20px; 
    border-radius: 8px; 
    display: flex; 
    flex-direction: column; 
    gap: 12px; 
}

.panel-section { 
    background: #1a1917; 
    padding: 10px; 
    border-radius: 6px; 
    border: 1px solid #333; 
    display: flex; 
    flex-direction: column; 
}

.panel-title { 
    font-size: 0.85rem; 
    font-weight: bold; 
    color: var(--accent); 
    margin-bottom: 6px; 
    text-transform: uppercase; 
}

#move-history { 
    height: 90px; 
    overflow-y: auto; 
    font-family: monospace; 
    font-size: 0.85rem; 
    color: #ccc; 
}

#chat-box { 
    height: 90px; 
    overflow-y: auto; 
    font-size: 0.85rem; 
    color: #fff; 
    margin-bottom: 5px; 
    display: flex; 
    flex-direction: column; 
    gap: 2px; 
}

#chat-input { 
    background: #262421; 
    border: 1px solid #444; 
    padding: 6px; 
    border-radius: 4px; 
    color: white; 
    font-size: 0.85rem; 
}

button { 
    background: var(--accent); 
    border: none; 
    color: white; 
    padding: 12px 20px; 
    font-size: 1rem; 
    font-weight: bold; 
    border-radius: 6px; 
    cursor: pointer; 
    transition: background 0.2s; 
    display: flex; 
    justify-content: center; 
    align-items: center; 
    gap: 10px; 
    width: 100%; 
    box-sizing: border-box; 
}

button:hover { background: #a3d16c; }

.btn-secondary { 
    background: #383531; 
    border: 1px solid #555; 
}

.btn-secondary:hover { background: #444; }

.btn-google { background: #4285F4; } 
.btn-google:hover { background: #5a95f5; }

input, select { 
    background: #1a1917; 
    border: 2px solid #444; 
    color: white; 
    padding: 12px; 
    border-radius: 6px; 
    font-size: 1rem; 
    width: 100%; 
    box-sizing: border-box; 
    text-align: center; 
}

.profile-badge { 
    background: #111; 
    padding: 15px; 
    border-radius: 8px; 
    margin-bottom: 5px; 
    border: 1px solid var(--accent); 
    display: flex; 
    align-items: center; 
    gap: 15px; 
    text-align: left; 
    position: relative; 
}

.profile-avatar-container { 
    position: relative; 
    width: 60px; 
    height: 60px; 
    cursor: pointer; 
}

.profile-avatar { 
    width: 60px; 
    height: 60px; 
    border-radius: 8px; 
    object-fit: cover; 
    background: #333; 
    border: 2px solid #555; 
}

.avatar-hint { 
    position: absolute; 
    bottom: 0; 
    width: 100%; 
    background: rgba(0,0,0,0.7); 
    font-size: 9px; 
    text-align: center; 
    color: #fff; 
    padding: 2px 0; 
    border-radius: 0 0 6px 6px; 
}

.friends-list { 
    max-height: 130px; 
    overflow-y: auto; 
    display: flex; 
    flex-direction: column; 
    gap: 5px; 
    margin-top: 5px; 
}

.friend-item { 
    display: flex; 
    align-items: center; 
    justify-content: space-between; 
    background: #262421; 
    padding: 6px 10px; 
    border-radius: 6px; 
    font-size: 0.9rem; 
}

.friend-info { 
    display: flex; 
    align-items: center; 
    gap: 8px; 
}

.status-dot { 
    width: 8px; 
    height: 8px; 
    border-radius: 50%; 
    display: inline-block; 
}

.status-online { background: #2ecc71; } 
.status-ingame { background: #f1c40f; } 
.status-offline { background: #95a5a6; }

.btn-challenge { 
    padding: 4px 8px; 
    font-size: 0.8rem; 
    width: auto; 
}

#promotion-modal, #game-over-screen, #draw-modal, #challenge-modal { 
    display: none; 
    position: fixed; 
    top: 0; 
    left: 0; 
    width: 100%; 
    height: 100%; 
    z-index: 100; 
    align-items: center; 
    justify-content: center; 
}

#game-over-screen, #draw-modal, #challenge-modal { 
    background: rgba(0,0,0,0.85); 
    flex-direction: column; 
}

#challenge-content, #draw-content { 
    background: var(--panel-bg); 
    padding: 25px; 
    border-radius: 12px; 
    text-align: center; 
    border: 2px solid var(--accent); 
    display: flex; 
    flex-direction: column; 
    gap: 15px; 
    width: 300px; 
}

#game-over-text { 
    font-size: 2rem; 
    font-weight: bold; 
    color: var(--accent); 
    margin-bottom: 10px; 
    text-align: center; 
}

.elo-change { 
    font-size: 1.2rem; 
    margin-bottom: 20px; 
    color: #ccc; 
}

#promotion-content { 
    background: var(--panel-bg); 
    padding: 20px; 
    border-radius: 12px; 
    border: 2px solid var(--accent); 
    text-align: center; 
}

.promo-choice { 
    width: 60px; 
    height: 60px; 
    margin: 5px; 
    cursor: pointer; 
    background: #383531; 
    border-radius: 8px; 
}

.auth-form { 
    display: flex; 
    flex-direction: column; 
    gap: 10px; 
}

.separator { 
    margin: 10px 0; 
    color: #777; 
    font-weight: bold; 
    font-size: 0.9rem; 
}

.hidden-file { display: none; }