* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background: linear-gradient(135deg, #0f0f0f, #1a1a1a);
    min-height: 100vh;
    display: flex;
    justify-content: center; 
    align-items: center;
    margin: 0;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 400px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(15px);
    border-radius: 20px;
    border: 5px dashed black;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    padding: 25px;
    transition: all 0.3s ease;
}

@keyframes fade-in {
    from{opacity: 0;}
    to{opacity: 1;}
}

.input {
    width: 100%;
    height: 40px;
    margin-bottom: 10px;
    padding: 15px;
    font-size: 20px;
    text-align: right;
    border: none;
    border-radius: 10px;
    background: rgba(0, 0, 0, 0.4);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.05);
    color: #ffffff;
    outline: none;
    opacity: 0;
    animation: fade-in 1s ease-in-out 0.5s forwards;
}

.output {
    width: 100%;
    height: 30px;
    margin-bottom: 20px;
    padding: 5px 15px;
    border-radius: 10px;
    border: none;
    background: rgba(0, 0, 0, 0.4);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.05);
    font-size: 16px;
    text-align: right;
    color: #ffffff;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    opacity: 0;
    animation: fade-in 1s ease-in-out 1s forwards;
}

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

hr {
    grid-column: 1 / -1;
    height: 1px;
    border: none;
    background: linear-gradient(to right, transparent, #ffffff66, transparent);
    margin: 5px 0;
}

button {
    height: 45px;
    border: 1px solid transparent;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    background: #ffffff15;
    color: #ffffffdd;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    transition: 0.2s ease-in-out;
    outline: none;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 10px rgba(0, 0, 0, 0.15);
}

button:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.ac {
    background: #ff2f20;
    color: #ffffff;
    border: none;
    outline:none
}

.cross {
    background: #ffc720;
    color: #000000;
    border: none;
}

.equal {
    background: #2bff32;
    color: #000000;
    border: none;
}

.plus, .minus, .multiply, .divide, .percent, .power, .root, .pi, .not, .braces {
    background: #00bcd420;
    border: 1px solid #00bcd4;
    color: #00e5ff;
}

.sin, .cos, .tan, .log {
    background: #9c27b020;
    border: 1px solid #9c27b0;
    color: #e1bee7;
}

/* Animations */
.root    { opacity: 0; animation: fade-in 1s ease-in-out 1.2s forwards; }
.pi      { opacity: 0; animation: fade-in 1s ease-in-out 1.4s forwards; }
.power   { opacity: 0; animation: fade-in 1s ease-in-out 1.6s forwards; }
.not     { opacity: 0; animation: fade-in 1s ease-in-out 1.8s forwards; }
.log     { opacity: 0; animation: fade-in 1s ease-in-out 2s forwards; }
.tan     { opacity: 0; animation: fade-in 1s ease-in-out 2.2s forwards; }
.cos     { opacity: 0; animation: fade-in 1s ease-in-out 2.4s forwards; }
.sin     { opacity: 0; animation: fade-in 1s ease-in-out 2.6s forwards; }
hr       { opacity: 0; animation: fade-in 1s ease-in-out 2.6s forwards; }
.ac      { opacity: 0; animation: fade-in 1s ease-in-out 2.8s forwards; }
.braces  { opacity: 0; animation: fade-in 1s ease-in-out 3s forwards; }
.percent { opacity: 0; animation: fade-in 1s ease-in-out 3.2s forwards; }
.divide  { opacity: 0; animation: fade-in 1s ease-in-out 3.4s forwards; }
.multiply{ opacity: 0; animation: fade-in 1s ease-in-out 3.6s forwards; }
.minus   { opacity: 0; animation: fade-in 1s ease-in-out 3.8s forwards; }
.plus    { opacity: 0; animation: fade-in 1s ease-in-out 4s forwards; }
.equal   { opacity: 0; animation: fade-in 1s ease-in-out 4.2s forwards; }
.cross   { opacity: 0; animation: fade-in 1s ease-in-out 4.4s forwards; }
.decimal { opacity: 0; animation: fade-in 1s ease-in-out 4.6s forwards; }
.zero    { opacity: 0; animation: fade-in 1s ease-in-out 4.8s forwards; }
.one     { opacity: 0; animation: fade-in 1s ease-in-out 5s forwards; }
.two     { opacity: 0; animation: fade-in 1s ease-in-out 5.2s forwards; }
.three   { opacity: 0; animation: fade-in 1s ease-in-out 5.4s forwards; }
.six     { opacity: 0; animation: fade-in 1s ease-in-out 5.6s forwards; }
.five    { opacity: 0; animation: fade-in 1s ease-in-out 5.8s forwards; }
.four    { opacity: 0; animation: fade-in 1s ease-in-out 6s forwards; }
.seven   { opacity: 0; animation: fade-in 1s ease-in-out 6.2s forwards; }
.eight   { opacity: 0; animation: fade-in 1s ease-in-out 6.4s forwards; }
.nine    { opacity: 0; animation: fade-in 1s ease-in-out 6.6s forwards; }

@media (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    button {
        height: 50px;
        font-size: 18px;
    }
    
    .input {
        height: 50px;
        font-size: 20px;
    }
    
    .output {
        font-size: 16px;
    }
}

@media (max-width: 360px) {
    .buttons-div {
        gap: 8px;
    }
    
    button {
        height: 45px;
        font-size: 16px;
    }
}