.bl-donation-card {
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
    padding: 30px;
    max-width: 400px;
    margin: 20px auto;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    color: #333;
}

.bl-donation-header h3 {
    margin: 0 0 10px 0;
    font-size: 24px;
    color: #1a1a1a;
    font-weight: 700;
}

.bl-donation-header p {
    margin: 0 0 25px 0;
    color: #666;
    font-size: 15px;
}

.bl-input-group {
    position: relative;
    margin-bottom: 20px;
}

.currency-symbol {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 20px;
    color: #333;
    font-weight: 500;
}

.bl-input-group input {
    width: 100%;
    padding: 15px 15px 15px 35px;
    border: 2px solid #e1e1e1;
    border-radius: 12px;
    font-size: 24px;
    outline: none;
    transition: border-color 0.3s;
    font-weight: 600;
}

.bl-input-group input:focus {
    border-color: #6366f1;
}

.bl-amount-presets {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-bottom: 25px;
}

.preset-btn {
    padding: 10px 5px;
    border: 2px solid #f3f4f6;
    background: #f9fafb;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.2s;
    color: #4b5563;
}

.preset-btn:hover {
    background: #f3f4f6;
}

.preset-btn.active {
    border-color: #6366f1;
    background: #6366f1;
    color: #fff;
}

.bl-submit-btn {
    width: 100%;
    padding: 16px;
    background: #6366f1;
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, background 0.3s;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.bl-submit-btn:hover {
    background: #4f46e5;
    transform: translateY(-2px);
}

.bl-submit-btn:active {
    transform: translateY(0);
}

.bl-donation-footer {
    margin-top: 25px;
    text-align: center;
    font-size: 13px;
    color: #999;
}

.bl-message {
    margin-top: 15px;
    font-size: 14px;
    text-align: center;
}

.bl-message.error {
    color: #ef4444;
}

.btn-loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}