/* Základní reset a barvy */
:root {
    --bg-color: #0b0e14;
    --card-bg: #1a1f29;
    --accent-color: #00ffcc;
    --text-color: #ffffff;
    --grid-bg: #242b38;
    --danger: #ff4d4d;
}

body {
    background-color: var(--bg-color);
    color: var(--accent-color);
    font-family: 'Courier New', monospace; /* Pro "hacker" vzhled */
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    overflow: hidden;
}

/* Hlavní herní kontejner */
.game-card {
    background-color: var(--card-bg);
    padding: 30px;
    border: 2px solid var(--accent-color);
    border-radius: 10px;
    box-shadow: 0 0 25px rgba(0, 255, 204, 0.15);
    width: 420px;
    text-align: center;
}

h1 {
    font-size: 1.8rem;
    letter-spacing: 4px;
    margin-bottom: 5px;
    text-transform: uppercase;
    text-shadow: 0 0 10px var(--accent-color);
}

/* Grid se surovinami */
.res-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin: 25px 0;
    background: var(--grid-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px inset rgba(255, 255, 255, 0.1);
}

.res-item {
    font-size: 0.75rem;
    color: #8899aa;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.res-val {
    display: block;
    font-size: 1.3rem;
    color: var(--text-color);
    font-weight: bold;
    margin-top: 5px;
}

/* Budovy a tlačítka */
.building {
    border-top: 1px solid rgba(0, 255, 204, 0.3);
    padding-top: 20px;
    margin-top: 20px;
}

h3 {
    font-size: 1rem;
    margin-bottom: 5px;
}

.stats {
    font-size: 0.7rem;
    color: var(--accent-color);
    opacity: 0.6;
    display: block; /* Dáme to pod hlavní číslo */
    margin-top: 2px;
}

button {
    background-color: var(--accent-color);
    color: var(--bg-color);
    border: none;
    padding: 14px 20px;
    font-family: 'Courier New', monospace;
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    width: 100%;
    border-radius: 4px;
    transition: all 0.2s ease;
    text-transform: uppercase;
}

button:hover {
    background-color: #ffffff;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.6);
    transform: translateY(-2px);
}

button:active {
    transform: translateY(0);
}

button:disabled {
    background-color: #333d4d;
    color: #667788;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}
#exp-progress-bar {
    box-shadow: 0 0 10px #ff00ff, 0 0 20px #ff00ff;
}
.error-msg {
    color: #ff4444;
    font-size: 0.7rem;
    height: 14px; /* Fixní výška, aby layout neskákal */
    margin-top: 4px;
    opacity: 0;   /* Standardně je neviditelná */
    transition: opacity 0.3s ease;
    text-align: center;
}