:root {
    --color-primary: #E41B13;
    --color-secondary: #666;
    --color-text: #333;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

a {
    color: var(--color-text);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

body {
    font-family: 'Roboto', -apple-system, system-ui, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 16px;
    color: var(--color-text);
    background: #F2F2F2;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.button {
    text-transform: uppercase;
    padding-inline: 1.5rem;
    height: 3rem;
    font-weight: 700;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s, border-color 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.button .icon {
    fill: currentColor;
    width: 24px;
    height: 24px;
}

.button--primary {
    background-color: var(--color-primary);
    color: #FFFFFF;
    border: 1px solid transparent;
}

.button--primary:hover {
    background-color: hsl(from var(--color-primary) h s calc(l - 10));
}

.button--secondary {
    background-color: white;
    color: var(--color-secondary);
    border: 1px solid var(--color-secondary);
}

.button--secondary:hover {
    background-color: var(--color-secondary);
    color: white;
}

.subtitle {}

.container {
    margin-top: 2rem;
    text-align: center;
    background: #FFFFFF;
    padding: 30px 20px;
    border-radius: 4px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    max-width: 650px;
    width: 100%;
    position: relative;
}

.footer {
    padding: 20px;
}

.footer nav {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
}

.footer nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
}

.footer .legal {
    margin: 1rem 0 0 0;
    font-size: small;
    opacity: 0.7;
}

#language-select {
    padding: 6px 12px;
    font-size: 0.85rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    background-color: #fff;
    cursor: pointer;
    font-family: inherit;
    color: #333;
    transition: border-color 0.3s;
}

#language-select:hover,
#language-select:focus {
    border-color: var(--color-secondary);
    background-color: var(--color-secondary);
    color: white;
    outline: none;
}

h1 {
    margin-bottom: 20px;
    font-size: clamp(1.5rem, 5vw, 2.5rem);
    font-weight: 700;
}

.game-info {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 25px;
    font-size: clamp(0.875rem, 2.5vw, 1rem);
    font-weight: 500;
}

.game-info .value {
    color: var(--color-primary);
}

.game-board {
    display: grid;
    grid-template-columns: repeat(4, minmax(70px, 120px));
    grid-gap: clamp(8px, 2vw, 15px);
    justify-content: center;
    perspective: 1000px;
    max-width: 610px;
}

.card {
    width: 100%;
    aspect-ratio: 1;
    max-width: 120px;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s;
    cursor: pointer;
}

.card.flipped {
    transform: rotateY(180deg);
}

.card.matched {
    cursor: default;
}

.card.matched .card-front,
.card.matched .card-back {
    opacity: 0.7;
}

.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 4px;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.card-front {
    background-color: #fff;
    transform: rotateY(180deg);
    overflow: hidden;
}

.card-front img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.card-back {
    background: var(--color-primary);
    font-size: clamp(2rem, 5vw, 3rem);
    color: #FFFFFF;
    font-weight: 700;
}

.button-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-top: 2rem;
}

/* Victory Overlay */
.victory-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    animation: fadeIn 0.3s ease-in;
}

.victory-overlay.hidden {
    display: none;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.victory-content {
    background: #FFFFFF;
    padding: clamp(30px, 8vw, 50px) clamp(20px, 8vw, 60px);
    border-radius: 4px;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.4s ease-out;
    max-width: 500px;
    width: 90%;
    margin: 0 20px;
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.victory-content h2 {
    color: #000000;
    font-size: clamp(1.75rem, 6vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 15px;
}

.victory-message {
    color: #4C4C4C;
    font-size: clamp(1rem, 3vw, 1.125rem);
    margin-bottom: 10px;
}

.victory-moves {
    color: var(--color-primary);
    font-size: clamp(2rem, 8vw, 3rem);
    font-weight: 700;
    margin: 15px 0;
}

.best-score-message {
    color: #4C4C4C;
    font-size: clamp(0.875rem, 2.5vw, 1rem);
    margin: 15px 0;
    font-weight: 500;
}

.best-score-message.hidden {
    display: none;
}

.best-score-message.new-record {
    color: var(--color-primary);
    font-weight: 700;
    font-size: clamp(1rem, 3vw, 1.125rem);
}

@media (max-width: 768px) {
    body {
        padding-top: 0px;
    }

    .container {
        padding: 20px 15px;
    }

    .game-info {
        gap: 12px;
    }
}

@media (max-width: 480px) {
    body {
        padding-inline: 0px;
        padding-top: 20px;
    }

    .container {
        padding: 15px 10px;
        box-shadow: none;
        border-radius: 0;
    }

    .game-board {
        grid-template-columns: repeat(4, minmax(60px, 1fr));
        grid-gap: 6px;
    }

    .game-info {
        font-size: 0.875rem;
        gap: 10px;
    }

    .victory-content {
        width: 95%;
        margin: 0 10px;
        padding: 25px 15px;
    }

    .button-container {
        flex-direction: column;
        gap: 10px;
    }
}

@media (max-width: 360px) {
    .game-board {
        grid-template-columns: repeat(4, minmax(55px, 1fr));
        grid-gap: 5px;
    }

    h1 {
        margin-bottom: 0.5rem;
    }


    .game-info {
        gap: 8px;
        margin-bottom: 15px;
    }
}

/* Rules Overlay */
.rules-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    /* Higher than victory overlay */
    animation: fadeIn 0.3s ease-in;
}

.rules-overlay.hidden {
    display: none;
}

.rules-content {
    background: #FFFFFF;
    padding: clamp(30px, 8vw, 50px) clamp(20px, 8vw, 60px);
    border-radius: 4px;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.4s ease-out;
    max-width: 550px;
    width: 90%;
    margin: 0 20px;
}

.rules-content h2 {
    color: var(--color-primary);
    font-size: clamp(1.75rem, 6vw, 2.5rem);
    font-weight: 700;
    margin-bottom: 25px;
}

.rules-text {
    text-align: left;
    color: #4C4C4C;
    font-size: clamp(1rem, 3vw, 1.125rem);
    margin-bottom: 30px;
    line-height: 1.6;
}

.rules-text p {
    margin-bottom: 15px;
    font-weight: 500;
}

.rules-text ul {
    padding-left: 6px;
    list-style-type: none;
}

.rules-text li {
    margin-bottom: 10px;
    position: relative;
    padding-left: 15px;
}

.rules-text li::before {
    content: "•";
    color: var(--color-primary);
    font-weight: bold;
    position: absolute;
    left: -5px;
}

.checkbox-container {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    color: #4C4C4C;
    font-size: 0.9rem;
    font-weight: 500;
}

.checkbox-container input[type="checkbox"] {
    accent-color: var(--color-primary);
    cursor: pointer;
    width: 16px;
    height: 16px;
}

.checkbox-container label {
    cursor: pointer;
    user-select: none;
}

@media (max-width: 480px) {
    .rules-content {
        padding: 30px 20px;
    }

    .rules-text {
        font-size: 0.95rem;
    }
}