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

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

body {
    font-family: 'Inter', sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #1a1a2e 100%);
    background-size: 300% 300%;
    animation: gradientPulse 10s ease infinite;
}

.card {
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 28px;
    padding: 52px 44px;
    width: 100%;
    max-width: 420px;
    box-shadow:
        0 30px 60px rgba(0, 0, 0, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    gap: 18px;
    animation: fadeUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(40px) scale(0.97);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

h1 {
    color: #ffffff;
    font-size: 1.75rem;
    font-weight: 700;
    text-align: center;
    letter-spacing: -0.6px;
    margin-bottom: 6px;
}

input[type="number"] {
    width: 100%;
    padding: 15px 18px;
    background: rgba(255, 255, 255, 0.07);
    border: 1px solid rgba(255, 255, 255, 0.13);
    border-radius: 14px;
    color: #ffffff;
    font-family: 'Inter', sans-serif;
    font-size: 0.97rem;
    font-weight: 400;
    outline: none;
    transition: background 0.25s, border-color 0.25s, box-shadow 0.25s;
    -moz-appearance: textfield;
    appearance: textfield;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
    -webkit-appearance: none;
}

input[type="number"]::placeholder {
    color: rgba(255, 255, 255, 0.35);
}

input[type="number"]:hover {
    background: rgba(255, 255, 255, 0.10);
    border-color: rgba(255, 255, 255, 0.22);
}

input[type="number"]:focus {
    background: rgba(255, 255, 255, 0.11);
    border-color: rgba(168, 85, 247, 0.7);
    box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.18);
}

button {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #a855f7 0%, #3b82f6 100%);
    border: none;
    border-radius: 14px;
    color: #ffffff;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.3px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.3s;
    margin-top: 4px;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(168, 85, 247, 0.45);
}

button:hover::after {
    left: 160%;
}

button:active {
    transform: translateY(0);
    box-shadow: 0 4px 12px rgba(168, 85, 247, 0.3);
}

#resultado {
    min-height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    font-size: 1rem;
    font-weight: 500;
    border-radius: 14px;
    padding: 14px 18px;
    color: rgba(255, 255, 255, 0.9);
    transition: background 0.4s, border-color 0.4s, color 0.4s;
}

#resultado:not(:empty) {
    animation: popIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

@keyframes popIn {
    from {
        transform: scale(0.88);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

#resultado.aviso {
    background: rgba(251, 191, 36, 0.12);
    border: 1px solid rgba(251, 191, 36, 0.35);
    color: #fcd34d;
}

#resultado.abaixo {
    background: rgba(96, 165, 250, 0.12);
    border: 1px solid rgba(96, 165, 250, 0.35);
    color: #93c5fd;
}

#resultado.normal {
    background: rgba(52, 211, 153, 0.12);
    border: 1px solid rgba(52, 211, 153, 0.35);
    color: #6ee7b7;
}

#resultado.acima {
    background: rgba(251, 146, 60, 0.12);
    border: 1px solid rgba(251, 146, 60, 0.35);
    color: #fdba74;
}

#resultado.obeso {
    background: rgba(248, 113, 113, 0.12);
    border: 1px solid rgba(248, 113, 113, 0.35);
    color: #fca5a5;
}

@media (max-width: 480px) {
    .card {
        margin: 20px;
        padding: 40px 28px;
    }
}