body {
    font-family: 'Montserrat', sans-serif;
    background-color: #1a1a2e;
    color: #eee;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

/* Zajištění, aby globální hlavička byla přes celou šířku i při align-items: center */
#header-placeholder {
    width: 100%;
}

#footer-placeholder {
    width: 100%;
}

/* Herní lišta */
.game-info-bar {
    width: 100%;
    background-color: #0f0e1c;
    padding: 20px 0;
    display: flex;
    justify-content: center;
    border-bottom: 1px solid #333;
}

.header-content {
    width: 100%;
    max-width: 1200px;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.game-title { 
    color: #00e0ff; 
    text-shadow: 0 0 15px rgba(0, 224, 255, 0.6); 
    margin: 0; }
    
.stats { display: flex; gap: 30px; font-weight: bold; color: #00e0ff; font-size: 1.3em; }
.buttons-row { display: flex; gap: 10px; }

button {
    padding: 10px 18px;
    background-color: transparent;
    color: #00e0ff;
    border: 2px solid #00e0ff;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: 0.3s;
}

button:hover { background-color: #00e0ff; color: #0f0e1c; }
#notes-mode-btn.active-mode { background-color: #00e0ff; color: #0f0e1c; box-shadow: 0 0 15px #00e0ff; }

/* Board a Pauza */
#game-container { margin-top: 40px; transition: filter 0.3s; }
#game-container.paused { filter: blur(12px); pointer-events: none; }

.board {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    width: 90vmin;
    max-width: 600px;
    aspect-ratio: 1 / 1;
    border: 4px solid #00e0ff;
    background-color: #0f0e1c;
}

.cell {
    border: 1px solid #252545;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.border-right { border-right: 3px solid #00e0ff !important; }
.border-bottom { border-bottom: 3px solid #00e0ff !important; }

.initial-value { font-weight: bold; color: #fff; background-color: #161633; font-size: 1.8em; }

.main-input {
    width: 100%; height: 100%; border: none; text-align: center;
    font-size: 1.8em; background-color: transparent; color: #00e0ff;
    outline: none; z-index: 2;
}

.cell.error .main-input { color: #ff4d4d !important; text-shadow: 0 0 10px #ff4d4d; }

/* Poznámky */
.notes-grid {
    display: grid; grid-template-columns: repeat(3, 1fr);
    width: 100%; height: 100%; position: absolute;
    pointer-events: none; z-index: 1; padding: 2px; box-sizing: border-box;
}
.note-num { font-size: 0.6em; color: #00e0ff; text-align: center; opacity: 0.6; }

/* Animace */
@keyframes neon-pulse {
    0% { background-color: transparent; }
    50% { background-color: rgba(57, 255, 20, 0.4); box-shadow: inset 0 0 15px #39FF14; }
    100% { background-color: transparent; }
}
.success-pulse { animation: neon-pulse 0.8s ease-out; }