@import url("https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap");

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Poppins", sans-serif;
}

body {
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-image: url("https://wallpapers.com/images/hd/book-with-white-flowers-tl9gtxj8d33m31ev.jpg");
    transition: background 0.3s ease;
}

.container {
    max-width: 300px;
    width: 100%;
    border-radius: 12px;
    padding: 10px 20px 20px;
    background: rgba(0, 0, 0, 0.1);
    border:1px solid white ;
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    transition: background 0.3s ease, color 0.3s ease;
}

.display {
    height: 60px;
    width: 100%;
    text-align: right;
    margin-bottom: 10px;
    font-size: 25px;
    color: rgb(249, 249, 250);
    pointer-events: none;
    border: none;
    outline: none;
    background: transparent;
}

.history {
    max-height: 100px;
    overflow-y: auto;
    text-align: right;
    font-size: 14px;
    margin-bottom: 10px;
    color: gray;
    border-top: 1px solid lightgray;
    padding-top: 5px;
}

.buttons {
    display: grid;
    grid-gap: 10px;
    grid-template-columns: repeat(4, 1fr);
}

button {
    padding: 10px;
    border-radius: 6px;
    border: none;
    background-color: rgb(183, 231, 231);
    font-size: 20px;
    cursor: pointer;
}

.operator {
    color: blue;
}

.memory {
    background: lightcoral;
    color: white;
}

/* Dark mode styles */
.dark-mode {
    background: #121212;
    color: white;
}

.dark-mode .container {
    background: #222;
    color: white;
}

.dark-mode .display {
    color: white;
}

.theme-toggle {
    cursor: pointer;
    font-size: 18px;
    margin-bottom: 10px;
    color: black;
    transition: color 0.3s ease;
}

.dark-mode .theme-toggle {
    color: white;
}

.history-container {
    margin-top: 10px;
    padding: 10px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    max-height: 150px;
    overflow-y: auto;
}

.history p {
    font-size: 14px;
    margin: 5px 0;
    color: rgb(254, 254, 255);
}