html {
    box-sizing: border-box;
    height: 100%;
}

*,
*::before,
*::after {
    box-sizing: inherit;
    margin: 0;
    padding: 0;
}

body {
    align-items: center;
    background: linear-gradient(320deg, #eb92be, #fff, #63c);
    display: flex;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    height: inherit;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.wrapper {
    backdrop-filter: blur(5.5px);
    -webkit-backdrop-filter: blur(5.5px);
    background: rgba(255, 255, 255, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.34);
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
    color: #232323;
    max-width: 400px;
    width: 100%;
    padding: 20px;
    transition: transform 0.3s ease;
}

.wrapper:hover {
    transform: translateY(-2px);
}

.screen {
    backdrop-filter: blur(5.5px);
    -webkit-backdrop-filter: blur(5.5px);
    background: rgba(255, 255, 255, 0.75);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 16px;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.1);
    color: #232323;
    font-size: clamp(24px, 5vw, 35px);
    font-weight: 600;
    overflow: hidden;
    padding: 20px;
    text-align: right;
    width: 100%;
    word-wrap: break-word;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    margin-bottom: 20px;
}

.calc-button-row {
    display: flex;
    justify-content: space-between;
    margin: 8px 0;
    gap: 8px;
}

.calc-button {
    backdrop-filter: blur(5.5px);
    -webkit-backdrop-filter: blur(5.5px);
    background: rgba(255, 255, 255, 0.75);
    border: 1px solid rgba(94, 42, 172, 0.3);
    border-radius: 16px;
    box-shadow: 0 4px 15px rgba(35, 35, 35, 0.1);
    color: #232323;
    flex-basis: 20%;
    font-family: inherit;
    font-size: 20px;
    font-weight: 600;
    height: 65px;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calc-button:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(35, 35, 35, 0.15);
}

.calc-button:active {
    background: rgba(166, 136, 226, 0.8);
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(35, 35, 35, 0.2);
}

.calc-button.equals {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    font-weight: bold;
}

.calc-button.equals:hover {
    background: linear-gradient(135deg, #5a67d8 0%, #6b46c1 100%);
    transform: translateY(-1px);
}

.calc-button.operator {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
}

.calc-button.operator:hover {
    background: linear-gradient(135deg, #ec77ab 0%, #eb4d4b 100%);
}

.calc-button.clear {
    background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
    color: #333;
}

.calc-button.clear:hover {
    background: linear-gradient(135deg, #ff7979 0%, #f8b500 100%);
}

.double {
    flex-basis: calc(45% - 4px);
}

.triple {
    flex-basis: calc(70% - 4px);
}

.error {
    color: #e74c3c;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    75% {
        transform: translateX(5px);
    }
}

/* Responsive design */
@media (max-width: 480px) {
    .wrapper {
        margin: 10px;
        padding: 15px;
    }

    .calc-button {
        height: 55px;
        font-size: 18px;
    }

    .screen {
        font-size: 24px;
        padding: 15px;
        min-height: 70px;
    }
}

/* Accessibility */
.calc-button:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    .screen {
        background: rgba(45, 45, 45, 0.9);
        color: #ffffff;
    }

    .calc-button {
        background: rgba(60, 60, 60, 0.8);
        color: #ffffff;
        border: 1px solid rgba(255, 255, 255, 0.2);
    }
}