body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #3a3d40, #181719);
    color: #ffffff;
}

.container {
    text-align: center;
    background: rgba(26, 26, 26, 0.95);
    border-radius: 16px;
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.5);
    padding: 20px;
    max-width: 800px;
    width: 90%;
}

h1 {
    color: #ffb03b;
    font-size: 2.2rem;
    margin-bottom: 10px;
}

.category, .difficulty {
    font-size: 1rem;
    color: #bfc7d5;
    margin: 5px 0;
}

.highlight {
    color: #ffb03b;
    font-weight: bold;
}

canvas {
    display: block;
    margin: 20px auto;
    background: #2e3b4e;
    border: 2px solid #ffb03b;
    border-radius: 12px;
    max-width: 100%;
    height: auto;
}

.word {
    font-size: 1.6rem;
    letter-spacing: 0.5rem;
    margin-bottom: 15px;
    font-weight: bold;
    color: #f1f1f1;
}

.letters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 15px;
}

.letter {
    background: #ffb03b;
    color: #2e3b4e;
    border: none;
    padding: 10px 15px;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s, transform 0.2s;
}

.letter:hover {
    background: #d08930;
    transform: scale(1.1);
}

.letter:disabled {
    background: #7f8c8d;
    cursor: not-allowed;
}

.remaining {
    font-size: 1.2rem;
    color: #d08930;
    margin-top: 20px;
}

footer {
    margin-top: 20px;
    text-align: center;
    font-size: 0.9rem;
    color: #bfc7d5;
}

footer a {
    color: #ffb03b;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s;
}

footer a:hover {
    color: #d08930;
}

footer a:visited {
    color: #b87333;
}

footer span {
    color: #ff4b5c;
    font-size: 1.2rem;
}

.popup {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(26, 26, 26, 0.95);
    color: #ffffff;
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.6);
    text-align: center;
    display: none;
    max-width: 80%;
}

.popup h2 {
    margin-bottom: 20px;
    font-size: 1.5rem;
}

.popup button {
    background: #ffb03b;
    color: #2e3b4e;
    border: none;
    padding: 10px 15px;
    border-radius: 10px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s;
}

.popup button:hover {
    background: #d08930;
}

@media (min-width: 1024px) {
    h1 {
        font-size: 2.5rem;
    }

    .word {
        font-size: 2rem;
        letter-spacing: 0.5rem;
    }

    .letter {
        font-size: 1.2rem;
        padding: 12px 20px;
    }
}

@media (max-width: 768px) {
    .letter {
        font-size: 0.9rem;
        padding: 8px 12px;
    }

    .word {
        font-size: 1.3rem;
        letter-spacing: 0.3rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.8rem;
    }

    .letter {
        font-size: 0.8rem;
        padding: 6px 10px;
    }

    .word {
        font-size: 1.1rem;
        letter-spacing: 0.2rem;
    }

    .container {
        padding: 15px;
    }

    .popup {
        padding: 20px;
    }
}