:root {
    /* Colors */
    --w3-gold: #c3b063;
    --w3-red: #901623;
    --w3-black: #0d0907;
    --w3-white: #ffffff;
    --w3-gray-bg: #f4f6f8;
    
    /* Spacing & Borders */
    --w3-radius: 12px;
    --w3-shadow: 0 8px 30px rgba(0,0,0,0.06);
    --w3-border: #e1e1e1;
}

/* Wrapper */
.w3itbd-wrapper {
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    color: var(--w3-black);
    box-sizing: border-box;
}

.w3itbd-wrapper * {
    box-sizing: border-box;
}

/* --- Grid Layout --- */
.w3itbd-grid {
    display: flex;
    gap: 40px;
    align-items: flex-start;
}

.w3itbd-left-col { flex: 1; }

.w3itbd-right-col {
    width: 380px;
    position: sticky;
    top: 20px;
    z-index: 99;
}

/* --- Typography --- */
h2.w3itbd-title {
    font-family: Georgia, serif;
    font-size: 26px;
    margin-top: 0;
    margin-bottom: 25px;
    color: var(--w3-black);
    font-weight: 600;
    border-bottom: 2px solid var(--w3-gold);
    display: inline-block;
    padding-bottom: 5px;
}

/* --- Sponsorship Cards --- */
.w3itbd-sponsors {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 40px;
}

.w3itbd-card {
    background: var(--w3-white);
    padding: 20px 10px;
    border-radius: var(--w3-radius);
    text-align: center;
    cursor: pointer;
    border: 2px solid transparent;
    box-shadow: 0 4px 10px rgba(0,0,0,0.03);
    transition: all 0.2s ease;
}

.w3itbd-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.08);
}

.w3itbd-card.active {
    border-color: var(--w3-gold);
    background: #fffdf5;
}

.w3itbd-amount-text {
    display: block;
    font-size: 22px;
    font-weight: 800;
    color: var(--w3-black);
    margin-bottom: 5px;
}

.w3itbd-desc { font-size: 12px; color: #666; }

/* --- Form Container --- */
.w3itbd-form-section {
    background: var(--w3-white);
    padding: 40px;
    border-radius: var(--w3-radius);
    box-shadow: var(--w3-shadow);
    border: 1px solid var(--w3-border);
    margin-top: 20px;
}

.w3itbd-row {
    display: flex;
    gap: 25px;
    margin-bottom: 25px;
}
.w3itbd-col { flex: 1; }
.w3itbd-full-row { margin-bottom: 25px; }

.w3itbd-label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    font-size: 14px;
    color: #333;
}

.w3itbd-required { color: var(--w3-red); }

.w3itbd-input {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--w3-border);
    border-radius: 6px;
    font-size: 15px;
    color: var(--w3-black);
    background: #fff;
    transition: 0.3s;
}

.w3itbd-input:focus {
    border-color: var(--w3-gold);
    outline: none;
    box-shadow: 0 0 0 4px rgba(195, 176, 99, 0.15);
}

/* --- Right Side: Amount Box --- */
.w3itbd-amount-box {
    background: var(--w3-gold);
    padding: 35px;
    border-radius: var(--w3-radius);
    box-shadow: var(--w3-shadow);
    text-align: center;
    color: var(--w3-white);
}

.w3itbd-amount-label {
    font-size: 20px;
    font-weight: 500;
    display: block;
    margin-bottom: 20px;
    font-family: Georgia, serif;
    color: var(--w3-white);
}

.w3itbd-input-wrap {
    position: relative;
    margin-bottom: 25px;
    background: var(--w3-white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.05);
}

.w3itbd-currency {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 24px;
    color: var(--w3-gold);
    font-weight: bold;
}

.w3itbd-big-input {
    width: 100%;
    padding: 15px 20px 15px 50px;
    font-size: 36px;
    font-weight: 700;
    color: var(--w3-black);
    border: none;
    text-align: right;
    outline: none;
    background: transparent;
}
.w3itbd-big-input::placeholder { color: #e0e0e0; opacity: 1; }

/* Toggles */
.w3itbd-toggle-group {
    display: flex;
    background: rgba(255,255,255,0.25);
    padding: 5px;
    border-radius: 50px;
    margin-bottom: 30px;
    border: 1px solid rgba(255,255,255,0.4);
}

.w3itbd-toggle-btn {
    flex: 1;
    padding: 12px;
    border: none;
    background: transparent;
    font-weight: 600;
    font-size: 15px;
    color: var(--w3-white);
    cursor: pointer;
    border-radius: 40px;
    transition: all 0.2s ease;
}

.w3itbd-toggle-btn.active {
    background: var(--w3-white);
    color: var(--w3-red);
}

/* --- SUBMIT BUTTON --- */
.w3itbd-submit-btn {
    width: 100%;
    padding: 16px;
    border: none;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    
    /* Default: White BG, Red Text */
    background: var(--w3-white);
    color: var(--w3-red);
}

.w3itbd-submit-btn:hover {
    /* Hover: Red BG, White Text */
    background: var(--w3-red);
    color: var(--w3-white);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(144, 22, 35, 0.2);
}

/* --- Payment Tabs --- */
.w3itbd-pay-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.w3itbd-pay-tab {
    flex: 1 1 auto;
    min-width: 100px;
    padding: 15px;
    text-align: center;
    border: 1px solid var(--w3-border);
    background: #fafafa;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    color: #555;
    transition: 0.3s;
}

.w3itbd-pay-tab.active {
    background: #fffbf0;
    border-color: var(--w3-gold);
    color: var(--w3-black);
}

.w3itbd-gateway-fields { display: none; }
.w3itbd-gateway-fields.active { display: block; animation: fadeUp 0.3s ease; }

@keyframes fadeUp { 
    from { opacity: 0; transform: translateY(10px); } 
    to { opacity: 1; transform: translateY(0); } 
}

/* --- RESPONSIVE --- */
@media (max-width: 992px) {
    .w3itbd-grid { flex-direction: column; }
    
    /* Order: Form(1) -> Amount/Button(2) */
    .w3itbd-left-col { order: 1; width: 100%; }
    
    .w3itbd-right-col { 
        order: 2; 
        width: 100%; 
        position: static; 
        margin-top: 30px;
    }
    
    .w3itbd-row { flex-direction: column; gap: 15px; }
}