.main-container {
    gap: 0px;
}

.letters-row {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
    justify-content: center;
    min-height: 40px;
}

.letter {
    width: 40px;
    height: 40px;
    font-size: 1.5em;
    text-align: center;
    border: none;
    background-color: var(--bg-main);
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    font-weight: bold;
}

.word-row {
    display: flex;
    gap: 20px;
    align-items: center;
}

.input-box {
    width: 48px;
    height: 46px;
    font-size: 1.5em;
    text-align: center;
    border: 2px solid #ccc;
    border-radius: 4px;
    text-transform: uppercase;
    font-weight: bold;
    position: relative;
    z-index: 0;
}

.input-box.valid {
    outline: 3px solid green;
    border: 2px solid transparent;
}

.input-box.invalid-word {
    outline: 3px solid red;
    border: 2px solid transparent;
}

.input-box.invalid-letter {
    outline: 3px solid orange;
    border: 2px solid transparent;
}

.input-box:focus {
    outline: none;
}

.input-box.focused {
    border: 2px solid #007bff;
    box-shadow: inset 0 0 8px rgba(0, 123, 255, 0.4);
    z-index: 1;
}

.input-box.focused.valid {
    outline: 3px solid green;
    border: 2px solid #007bff;
}
.input-box.focused.invalid-word {
    outline: 3px solid red;
    border: 2px solid #007bff;
}
.input-box.focused.invalid-letter {
    outline: 3px solid orange;
    border: 2px solid #007bff;
}

.final-three-letter-words {
    display: flex;
    gap: 20px;
    align-items: center;
}

.spacer {
    width: 5px;
}

@keyframes pulse-red-transparent {
    0%, 25%, 75%, 100% { border-color: #FF3B30; }
    50% { border-color: transparent; }
}

/*
@keyframes shimmer-gold {
    0% {
        text-shadow: 0 0 0px gold;
        filter: brightness(1);
    }
    50% {
        text-shadow: 0 0 8px #ffd700, 0 0 16px #ffc107;
        filter: brightness(1.6);
    }
    100% {
        text-shadow: 0 0 0px gold;
        filter: brightness(1);
    }
}

.letter.shimmer {
    animation: shimmer-gold 2s infinite;
}
*/

.input-wrapper {
    position: relative;
    display: inline-block;
}

.input-wrapper::before {
    content: '';
    position: absolute;
    top: -3px;
    left: -3px;
    right: -3px;
    bottom: -3px;
    border-radius: 6px;
    border: 3px solid transparent;
    animation: pulse-red-transparent 2s infinite;
    opacity: 0;
    z-index: 2;
    pointer-events: none;
}

.input-wrapper.pulse-overuse::before {
    opacity: 1;
}

.puzzle {
    margin-bottom: 2rem;
}

@media (max-width: 600px) {
    .main-container {
        padding: 5px 20px;
    }

    .puzzle {
        margin-bottom: 0.4rem;
    }

    .letters-row {
        gap: 8px;
        margin-bottom: 8px;
        min-height: 28px;
    }

    .letter {
        width: 28px;
        height: 28px;
        font-size: 1.1rem;
    }

    .input-box {
        width: 38px;
        height: 38px;
        border-radius: 4px;
        font-size: 1.25rem;
    }

    .spacer {
        display: none;
    }

    .word-row {
        display: flex;
        gap: 5px;
        flex-direction: column;
    }

    .final-three-letter-words {
        gap: 40px;
    }

    .final-three-letter-words .word-inputs-3-1,
    .final-three-letter-words .word-inputs-3-2 {
        display: flex;
        gap: 5px;
    }
}