.aquarium-calculator {
    max-width: 520px;
    margin: 30px auto;
    padding: 30px;
    background: linear-gradient(135deg, #e7f0fb, #d0e4f7);
    border-radius: 12px;
    font-family: Arial, sans-serif;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    text-align: center;
}

/* Logo */
.aquarium-logo {
    margin-bottom: 20px;
}
.aquarium-logo img {
    max-width: 180px;
    height: auto;
    display: block;
    margin: 0 auto;
}

/* Título */
.aquarium-calculator h3 {
    color: #034a86;
    margin-bottom: 20px;
    font-size: 22px;
    text-shadow: 1px 1px #cce0f5;
}

/* Labels e Inputs */
.aquarium-calculator label {
    display: block;
    margin: 15px 0 6px 0;
    font-weight: 600;
    color: #0563af;
    text-align: left;
}
.aquarium-calculator input[type=number] {
    width: 100%;
    padding: 10px;
    border-radius: 6px;
    border: 1px solid #ccc;
    font-size: 16px;
    text-align: center;
    box-sizing: border-box;
}

/* Botões */
.aquarium-calculator button {
    margin-top: 22px;
    width: 100%;
    padding: 14px 0;
    background: #0073aa;
    color: #fff;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    font-size: 17px;
    cursor: pointer;
    transition: background-color 0.3s;
}
.aquarium-calculator button:hover:not(:disabled) {
    background: #005f87;
}
.aquarium-calculator button:disabled {
    background: #999;
    cursor: not-allowed;
}

/* Resultados */
.aquarium-results {
    margin-top: 28px;
    background: #d9e9fb;
    padding: 20px;
    border-radius: 10px;
    text-align: left;
    color: #034a86;
    font-weight: 600;
    line-height: 1.5;
    display: none;
}

/* WhatsApp */
.whatsapp-btn {
    margin-top: 20px;
    display: inline-block;
    background-color: #25D366;
    color: white;
    padding: 12px 20px;
    font-weight: 700;
    font-size: 16px;
    border-radius: 50px;
    text-decoration: none;
    transition: background-color 0.3s;
}
.whatsapp-btn:hover {
    background-color: #1ebe5d;
}

/* Mensagens de erro */
.error-message {
    color: #d9534f;
    font-size: 13px;
    margin-top: 4px;
    text-align: left;
    min-height: 18px;
}

/* Spinner de carregamento */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #ccc;
    border-top: 3px solid #0073aa;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    vertical-align: middle;
    margin-left: 8px;
}
@keyframes spin {
    0%{transform:rotate(0deg);}
    100%{transform:rotate(360deg);}
}