body {
    margin: 0;
    padding: 0;
    background-color: #f6f7fb;
    font-family: Arial;
    -webkit-user-select: none;
    -ms-user-select: none;
    user-select: none;
    display: flex;
    flex-direction: column;
    height: 100vh;
}

#ust {
    background-color: white;
    text-align: center;
    padding: 10px;
}

#oyun {
    text-align: center;
    background-color: #f6f7fb;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    flex-grow: 1;
    height: calc(100vh - 50px);
}

#game-board-container {
    height: 100%;
    display: flex;
    justify-content: center;
}

#game-board {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin: 12px;
    max-width: 80%;
    padding: 10px;
    box-sizing: border-box;
}

.card {
    width: calc(25% - 20px);
    flex-grow: 1;
    background-color: #fffffff3;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    cursor: pointer;
    text-align: center;
    padding: 15px;
    box-shadow: 0 4px 32px 0 #282e3e14;
    border-radius: 16px;
    box-sizing: border-box;
    margin: 1px;
    color: #282e3e;
    border: 3px solid #d9dde8;
    transition: all 0.02s ease;
}

.card:hover {
    background-color: #edf5faf3;
}

@media (max-width: 800px) {
    .card {
        width: calc(33.33% - 20px);
    }
}

@media (max-width: 500px) {
    .card {
        width: calc(50% - 20px);
    }
}

.card.matched {
    visibility: hidden;
}

.card.wrong {
    background-color: #fffffd !important;
    border: 3px solid #f1c40f !important;
}

.card.selected {
    border: 2px solid #00f;
}

#timer {
    padding: 12px;
    font-weight: bold;
}

#acilis {
    width: 50vw;
    margin-left: 25%;
    position: relative;
    top: calc(50vh - 100px);
    height: min-content;
    text-align: center;
    color: #282e3e;
}

#ac {
    position: absolute;
    top: calc(50% + 64px);
    transform: translate(-50%, -50%);
    margin: 0;
    left: 50%;
    width: fit-content;
}

#st {
    font-weight: bold;
    padding: 1.135rem 1.885rem;
    background: #4255ff;
    color: #fff;
    align-items: center;
    border: .125rem solid #0000;
    border-radius: .5rem;
    box-sizing: border-box;
    cursor: pointer;
    display: flex;
    justify-content: center;
    position: relative;
    width: -webkit-fit-content;
    width: -moz-fit-content;
    width: fit-content;
    transition: all .12s cubic-bezier(.47,0,.745,.715);
    width: 100%;
    font-size: 1rem;
}

#resetnow {
    padding: 1.135rem 1.885rem;
    background: white;
    color: #586380;
    align-items: center;
    border: .125rem solid #d9dde8;
    border-radius: .5rem;
    box-sizing: border-box;
    cursor: pointer;
    display: flex;
    position: absolute;
    justify-content: center;
    width: 100px;
    height: 30px;
    transition: all .12s cubic-bezier(.47,0,.745,.715);
    font-size: 1rem;
    top: 10px;
    right: 10px;
}

@keyframes shake {
    0% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    50% { transform: translateX(10px); }
    75% { transform: translateX(-10px); }
    100% { transform: translateX(0); }
}

.shake {
    animation: shake 0.2s ease-in-out;
}
#options-menu {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: rgba(255, 255, 255, 0.95);
    overflow: hidden;
}

#options-menu h3 {
    margin-top: 0;
    font-size: 2rem;
}

#options-menu p {
    font-size: 1.2rem;
    text-align: center;
    line-height: 1.5;
}

#options-menu button {
    padding: 10px 20px;
    background: #4255ff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    margin-top: 20px;
}

#options-menu button:hover {
    background: #3243cc;
}

.true {
    background-color: #eefcef!important;
    border-color: #07bc0c!important;
}

input[type="range"] {
    accent-color: #4255ff;
    border-radius: 10px;
    
}