body {
    margin: 0;
    background: linear-gradient(135deg, #01ebeb, #e0ffff);
    font-family: 'Segoe UI', sans-serif;
    overflow: hidden;
}

/* Decorations */
.shape {
    position: absolute;
    opacity: 0.15;
    z-index: 0;
    animation: float 10s infinite ease-in-out;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(15px); }
}

.circle1 {
    width: 200px;
    height: 200px;
    background: #01ebeb;
    top: -60px;
    left: -60px;
    border-radius: 50%;
}

.circle2 {
    width: 300px;
    height: 300px;
    background: #7efcf3;
    bottom: -100px;
    right: -100px;
    border-radius: 50%;
}

.square1 {
    width: 120px;
    height: 120px;
    background: #9bf7f7;
    top: 100px;
    right: 50px;
    transform: rotate(45deg);
    border-radius: 12px;
}

.triangle {
    width: 0;
    height: 0;
    border-left: 60px solid transparent;
    border-right: 60px solid transparent;
    border-bottom: 100px solid #62fafa;
    left: 20px;
    top: 60%;
}

.wave {
    width: 200px;
    height: 200px;
    background: radial-gradient(circle at 50% 50%, #d2ffff 0%, #81f5f5 100%);
    border-radius: 50%;
    bottom: 80px;
    left: 40px;
}

.star {
    width: 60px;
    height: 60px;
    background: #00dcdc;
    clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%);
    right: 30px;
    top: 50px;
}

.container {
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    animation: fadeIn 1s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

.calculator {
    width: 400px;
    background: #f2ffff;
    border: 2px solid #01ebeb;
    border-radius: 25px;
    padding: 25px;
    box-shadow: 0 15px 30px rgba(0, 128, 128, 0.2);
    position: relative;
    z-index: 2;
}

.display {
    width: 100%;
    height: 60px;
    background: #e6ffff;
    border: 1px solid #76f7f7;
    border-radius: 10px;
    padding: 10px;
    font-size: 24px;
    text-align: right;
    color: #066;
    box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.08);
    margin-bottom: 20px;
}

.buttons {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
}

.buttons button {
    padding: 16px;
    font-size: 17px;
    border: 1px solid #00dada;
    border-radius: 12px;
    background: linear-gradient(145deg, #00caca, #01ebeb);
    color: white;
    cursor: pointer;
    transition: all 0.25s ease;
    box-shadow: 0 4px 12px rgba(0, 128, 128, 0.3);
}

.buttons button:hover {
    transform: scale(1.05);
    background: linear-gradient(145deg, #01ebeb, #00caca);
    box-shadow: 0 6px 18px rgba(0, 128, 128, 0.4);
}

.buttons button:active {
    animation: bounce 0.15s ease;
}

@keyframes bounce {
    0% { transform: scale(1); }
    40% { transform: scale(1.12); }
    70% { transform: scale(0.95); }
    100% { transform: scale(1); }
}