.central-game-area {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 250px;
    margin-top: 20px;
}

.juego {
    text-align: center;
    padding: 4px;
}

.hidden {
    display: none !important;
}

.cifras-board {
    margin: 0 auto;
    background: #eee;
    padding: 9px;
    border-radius: 10px;
    border: 1px solid #ddd;
    position: relative;
}

.screen-area {
    background: #333;
    color: #ffff00;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 4px solid #555;
    min-height: 50px;
}

.target-number {
    font-size: 2.5em;
    font-weight: bold;
    font-family: 'Courier New', monospace;
    letter-spacing: 2px;
}

.timer-display {
    font-size: 1.5em;
    color: white;
    font-family: sans-serif;
    background: #d00;
    padding: 5px 10px;
    border-radius: 4px;
    min-width: 60px;
    text-align: center;
}

.tiles-area {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 7px;
    margin-bottom: 20px;
    align-items: center;
}

.letra-tile {
    width: 60px;
    height: 60px;
    background: linear-gradient(180deg, #3377ff 0%, #2255dd 100%);
    color: white;
    font-size: 1.4em;
    font-weight: bold;
    border: 2px solid #003399;
    border-radius: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 3px 5px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    text-transform: uppercase;
}

.letra-tile.used {
    background: #ccc;
    color: #777;
    border-color: #999;
    cursor: default;
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.1);
    transform: none !important;
}

.result-letter {
    font-size: 2em;
    font-weight: bold;
    color: #1978a1;
    cursor: pointer;
    margin: 0 1px;
    line-height: 1;
    user-select: none;
}

.result-letter:hover {
    color: #d9534f;
}

.letras-input-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    width: 100%;
    justify-content: flex-start;
    margin-bottom: 20px;
}

#letrasResultContainer {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    width: 100%;
    margin-bottom: 20px;
}

.game-controls {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.btn-control {
    padding: 8px 15px;
    font-size: 1.3em;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    color: white;
    font-weight: bold;
}

.btn-undo {
    background-color: #f0ad4e;
}

.btn-check {
    background-color: #5cb85c;
}

.msg-box {
    font-weight: bold;
    padding: 5px;
    color: #333;
    text-align: center;
    display: block;
    line-height: 1.3;
    margin-bottom: 20px;
    width: 100%;
}

.success-msg {
    color: #28a745;
}

.error-msg {
    color: #d9534f;
}

.lifelines {
    margin-top: 15px;
    border-top: 1px dashed #ccc;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 15px;
    padding-top: 10px;
    flex-wrap: wrap;
}

.lifelines-title {
    font-size: 0.9em;
    text-transform: uppercase;
    color: #777;
    font-weight: bold;
    margin: 0;
}

.lifelines-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
}

button.comodines {
    background-color: #f0ad4e;
    color: white;
    border: none;
    padding: 8px 16px;
    font-size: 0.9em;
    font-weight: bold;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.1s;
    text-transform: uppercase;
}

button.comodines:hover {
    background-color: #ec971f;
    transform: scale(1.05);
}

.start-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

.start-button {
    background-color: #007bff;
    color: white;
    border: none;
    padding: 12px 25px;
    font-size: 1.5em;
    cursor: pointer;
    border-radius: 30px;
    font-weight: bold;
    margin: 0;
    line-height: 1;
    transition: background-color 0.2s, transform 0.1s;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.start-button:hover {
    transform: scale(1.05);
}

.overlay-box {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 82%;
    max-width: 600px;
    text-align: center;
    background: #fff;
    padding: 25px;
    border-radius: 12px;
    color: #333;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
    border: 1px solid #ccc;
    z-index: 1000;
}

.common-description {
    text-align: left;
    background: #f8f9fa;
    padding: 15px;
    border-radius: 12px;
    color: #444;
    border: 1px solid #e9ecef;
    margin-top: 15px;
}

.common-description h3 {
    margin-top: 0;
    margin-bottom: 12px;
    color: #2c3e50;
    font-size: 1.1em;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-align: center;
    border-bottom: 2px solid #ddd;
    padding-bottom: 8px;
}

.instructions-list {
    padding-left: 15px;
    margin-bottom: 0;
    line-height: 1.4;
}

.instructions-list li {
    margin-bottom: 6px;
    font-size: 1.1em;
}

@media(max-width: 500px) {
    .letra-tile {
        width: 50px;
        height: 50px;
        font-size: 1em;
        margin: 1px;
    }
}