:root {
    --invis-blue: #0076CE; /* Professional medical blue */
    --invis-bg: #F7F9FB;   /* Off-white soft background */
    --invis-white: #FFFFFF;
    --invis-text: #2D3139;
    --shadow: 0 10px 30px rgba(0, 118, 206, 0.05); /* Very soft blue-tinted shadow */
}

body { 
    background-color: var(--invis-bg) !important; 
    color: var(--invis-text);
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
}

/* Floating Navigation */
nav {
    background: var(--invis-white);
    padding: 15px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo { font-size: 22px; letter-spacing: -0.5px; color: var(--invis-blue); }

/* Premium Cards */
.card, .form-container {
    background: var(--invis-white);
    border-radius: 24px; /* Extra rounded for that "organic" look */
    padding: 40px;
    border: 1px solid rgba(0,0,0,0.03);
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
}

/* Pill Buttons */
button {
    border-radius: 50px !important;
    font-weight: 600 !important;
    transition: all 0.2s ease;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--invis-blue);
    color: white;
    border: none;
    padding: 14px 28px;
}

.btn-primary:hover {
    background-color: #005DA3;
    box-shadow: 0 5px 15px rgba(0, 118, 206, 0.3);
}

/* Inputs */
input, textarea {
    background: #F0F4F7 !important;
    border: 2px solid transparent !important;
    border-radius: 12px !important;
    padding: 12px 16px !important;
    transition: all 0.2s ease;
}

input:focus {
    background: #fff !important;
    border-color: var(--invis-blue) !important;
    outline: none;
}

/* Referral Section */
.referral-box {
    background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 100%);
    border-radius: 20px;
    padding: 25px;
    border: 1px solid #e0e8f0;
}