* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    }

body {
    font-family: Arial, sans-serif;
    background: black;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

body::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.15), transparent),
                radial-gradient(circle at 80% 80%, rgba(236, 72, 153, 0.15), transparent);
    animation: floaty 15s ease-in-out infinite;
}

@keyframes floaty {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-30px); }
}

.ligne-scan {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(transparent, rgba(99, 102, 241, 0.5), transparent);
    animation: scan 8s linear infinite;
    pointer-events: none;
    z-index: 999;
}

@keyframes scan {
    from { top: 0; }
    to { top: 100%; }
}

.calculatrice {
    background: rgba(20, 20, 30, 0.8);
    border-radius: 30px;
    padding: 30px;
    width: 100%;
    max-width: 420px;
    backdrop-filter: blur(20px);
    border: 1px solid rgba(99, 102, 241, 0.3);
    box-shadow: 0 25px 80px rgba(0, 0, 0, 0.9),
                0 0 50px rgba(99, 102, 241, 0.2);
    animation: flotte 5s ease-in-out infinite;
    position: relative;
    z-index: 10;
}

@keyframes flotte {
    0%, 100% { transform: translateY(0) rotateX(2deg); }
    50% { transform: translateY(-15px) rotateX(2deg); }
}

.calculatrice::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, #6366f1, #ec4899, #a855f7, #6366f1);
    border-radius: 30px;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.5s;
}

.calculatrice:hover::before {
    opacity: 0.6;
    animation: brille 2s ease-in-out infinite;
}

@keyframes brille {
    0%, 100% { box-shadow: 0 0 20px rgba(99, 102, 241, 0.5); }
    50% { box-shadow: 0 0 40px rgba(99, 102, 241, 0.9); }
}

.ecran {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(168, 85, 247, 0.1));
    border-radius: 20px;
    padding: 30px 25px;
    margin-bottom: 25px;
    border: 1px solid rgba(99, 102, 241, 0.3);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 2px 20px rgba(99, 102, 241, 0.1),
                0 10px 30px rgba(0, 0, 0, 0.5);
    min-height: 110px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.ecran::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    animation: brille-ecran 3s infinite;
}

@keyframes brille-ecran {
    to { left: 200%; }
}

.operation-precedente {
    color: rgba(139, 141, 255, 0.7);
    font-size: 1.1rem;
    margin-bottom: 5px;
    min-height: 25px;
    text-shadow: 0 0 15px rgba(99, 102, 241, 0.5);
    word-wrap: break-word;
    word-break: break-all;
}

.operation-actuelle {
    color: white;
    font-size: 2.5rem;
    font-weight: 300;
    min-height: 45px;
    text-shadow: 0 0 25px rgba(99, 102, 241, 0.8);
    word-wrap: break-word;
    word-break: break-all;
}

.boutons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.btn {
    border: none;
    border-radius: 15px;
    font-size: 1.4rem;
    padding: 25px;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    transform: translateY(-3px) scale(1.03);
}

.btn:active {
    transform: translateY(-1px) scale(0.98);
}

.chiffre {
    background: linear-gradient(135deg, rgba(30, 30, 50, 0.9), rgba(40, 40, 70, 0.9));
    color: white;
    border: 1px solid rgba(99, 102, 241, 0.2);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
}

.chiffre:hover {
    border-color: rgba(99, 102, 241, 0.5);
    box-shadow: 0 10px 35px rgba(0, 0, 0, 0.6),
                0 0 25px rgba(99, 102, 241, 0.3);
}

.operation {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.3), rgba(139, 92, 246, 0.3));
    color: white;
    border: 1px solid rgba(99, 102, 241, 0.5);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.3);
}

.operation:hover {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.5), rgba(139, 92, 246, 0.5));
    box-shadow: 0 10px 35px rgba(99, 102, 241, 0.5),
                0 0 30px rgba(99, 102, 241, 0.6);
}

.egal {
    background: linear-gradient(135deg, #6366f1, #a855f7);
    color: white;
    grid-column: span 2;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

.egal:hover {
    background: linear-gradient(135deg, #818cf8, #c084fc);
    box-shadow: 0 10px 35px rgba(99, 102, 241, 0.7),
                0 0 50px rgba(99, 102, 241, 0.8);
}

.effacer {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.3), rgba(220, 38, 38, 0.3));
    color: white;
    border: 1px solid rgba(239, 68, 68, 0.5);
    box-shadow: 0 8px 25px rgba(239, 68, 68, 0.3);
}

.effacer:hover {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.5), rgba(220, 38, 38, 0.5));
    box-shadow: 0 10px 35px rgba(239, 68, 68, 0.5),
                0 0 30px rgba(239, 68, 68, 0.6);
}

.supprimer {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.3), rgba(217, 119, 6, 0.3));
    color: white;
    border: 1px solid rgba(245, 158, 11, 0.5);
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.3);
}

.supprimer:hover {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.5), rgba(217, 119, 6, 0.5));
    box-shadow: 0 10px 35px rgba(245, 158, 11, 0.5),
                0 0 30px rgba(245, 158, 11, 0.6);
}

@media (max-width: 480px) {
    .calculatrice {
        padding: 20px;
        max-width: 100%;
    }

    .ecran {
        padding: 20px 15px;
        min-height: 90px;
    }

    .operation-precedente {
        font-size: 0.9rem;
        min-height: 20px;
    }

    .operation-actuelle {
        font-size: 2rem;
        min-height: 35px;
    }

    .btn {
        padding: 20px;
        font-size: 1.2rem;
    }

    .boutons {
        gap: 10px;
    }
}

@media (max-width: 360px) {
    .calculatrice {
        padding: 15px;
    }

    .ecran {
        padding: 15px 12px;
        min-height: 80px;
    }

    .operation-actuelle {
        font-size: 1.7rem;
    }

    .btn {
        padding: 18px;
        font-size: 1.1rem;
    }

    .boutons {
        gap: 8px;
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .calculatrice {
        max-width: 450px;
        padding: 35px;
    }

    .btn {
        padding: 28px;
        font-size: 1.5rem;
    }
}