* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Arial, sans-serif;
    background: #0f1f24;
    color: #f5f7fa;
}

.app {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

/* START SCREEN */

.hero {
    width: 100%;
    max-width: 520px;
    text-align: center;
    background: #13282f;

    padding: 36px;

    border-radius: 28px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.08);

    display: flex;
    flex-direction: column;
    align-items: center;
}

/* BUTTON */

button {
    border: none;
    border-radius: 16px;
    padding: 16px 24px;
    font-size: 18px;
    font-weight: 700;
    color: white;
    background: #8b5cf6;
    cursor: pointer;

    margin-bottom: 12px;
}

button:hover {
    background: #7c3aed;
}

/* GAME */

.hidden {
    display: none;
}

.game {
    width: 100%;
    max-width: 900px;
    background: #13282f;
    padding: 28px;
    border-radius: 28px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}

.subtitle {
    color: #b8c4cc;
    margin-top: -8px;
}

.stats {
    display: flex;
    gap: 12px;
    align-items: center;
}

.stats span {
    background: #1f2f35;
    padding: 10px 14px;
    border-radius: 12px;
    font-weight: 700;
}

#timer {
    color: #facc15;
}

/* GRID */

.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 16px;
    row-gap: 12px;
    margin-top: 24px;
    grid-auto-flow: dense;
}

.column {
    display: contents;
}

/* CARDS */

.card {
    background: #1f2f35;
    padding: 16px;
    border-radius: 12px;
    cursor: pointer;
    text-align: center;
    transition: 0.2s;
}

.card:hover {
    background: #2c3f46;
}

/* STATES */

.selected {
    outline: 3px solid #8b5cf6;
    background: #35265f;
}

.correct {
    background: #16a34a !important;
}

.wrong {
    background: #dc2626 !important;
}

/* END SCREEN */

.end-screen {
    margin-top: 30px;
    text-align: center;
}
.category-box {
    width: 100%;
    margin-bottom: 24px;
    text-align: left;
}

.category-box label {
    display: block;
    margin-bottom: 8px;
    color: #b8c4cc;
    font-size: 14px;
}

.category-box select {
    width: 100%;
    padding: 14px;
    padding-right: 40px;
    border-radius: 12px;
    border: none;
    background: #1f2f35;
    color: white;
    font-size: 16px;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='white' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    background-size: 12px;
}

.category-box select:focus {
    outline: 2px solid #8b5cf6;
}

.game-actions {
    display: flex;
    gap: 10px;
    margin-top: 18px;
}

.game-actions button {
    padding: 10px 16px;
    font-size: 14px;
}

.logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    line-height: 1;
    margin-top: 0;
    margin-bottom: 14px;
}

.logo span:first-child {
    font-size: 64px;
    font-weight: 900;
    letter-spacing: -2px;
}

.logo span:last-child {
    font-size: 40px;
    font-weight: 700;
    color: white;
    margin-top: -4px;
    letter-spacing: 1px;
}

@media (max-width: 768px) {
    .app {
        padding: 12px;
    }

    .game {
        padding: 16px;
        border-radius: 16px;
    }

    .game-header {
        flex-direction: column;
        align-items: center;
        gap: 8px;
    }

    .game-header h2 {
        margin: 0 0 4px;
        font-size: 20px;
        text-align: center;
    }

    .subtitle {
        text-align: center;
        font-size: 13px;
    }

    .stats {
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px;
    }

    .stats span {
        padding: 6px 10px;
        font-size: 12px;
    }

    .game-actions {
        justify-content: center;
        margin-top: 8px;
    }

    .game-actions button {
        padding: 8px 14px;
        font-size: 13px;
    }

    .grid {
        grid-template-columns: 1fr 1fr;
    }

    .card {
        padding: 12px 10px;
        font-size: 14px;
    }
}