:root {
    --primary-color: #1e87f0;
    --secondary-color: #28a745;
    --paypal-color: #0070ba;
    --text-color: #333;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.sponsor-container {
    margin: 0 auto;
    padding: 40px 20px;
}

.sponsor-header {
    text-align: center;
    margin-bottom: 50px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
}

.sponsor-header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.sponsor-header p {
    font-size: 1.1rem;
    color: #666;
    margin: 0 auto;
}

.payment-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.payment-card {
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.payment-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: var(--primary-color);
}

.payment-card.wechat::before {
    background: var(--secondary-color);
}

.payment-card.paypal::before {
    background: var(--paypal-color);
}

.payment-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.payment-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.payment-card.wechat .payment-icon {
    color: var(--secondary-color);
}

.payment-card.paypal .payment-icon {
    color: var(--paypal-color);
}

.payment-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.payment-desc {
    color: #666;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.sponsor-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-bottom: 15px;
}

.payment-card.wechat .sponsor-btn {
    background-color: var(--secondary-color);
}

.payment-card.paypal .sponsor-btn {
    background-color: var(--paypal-color);
    display: inline-block;
    text-decoration: none;
}

.sponsor-btn:hover {
    opacity: 0.9;
}

.modal-qrcode {
    width: 250px;
    height: 250px;
    object-fit: cover;
    margin: 0 auto 20px;
    display: block;
}

.modal-content {
    text-align: center;
}

.modal-title {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 600;
}

.payment-card.wechat .modal-title {
    color: var(--secondary-color);
}

.donation-note {
    box-shadow: var(--shadow);
    padding: 25px;
    border-radius: 10px;
    margin-top: 40px;
}

.donation-note h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.donation-note ul {
    padding-left: 20px;
    margin-bottom: 0;
}

.donation-note li {
    margin-bottom: 8px;
    color: #555;
}

.thank-you {
    text-align: center;
    margin-top: 50px;
    padding: 30px;
    background: linear-gradient(135deg, #e8f4f8 0%, #f0f8fb 100%);
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.thank-you h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.thank-you p {
    color: #555;
    font-size: 1.05rem;
}

@media (max-width: 768px) {
    .sponsor-header h1 {
        font-size: 2rem;
    }

    .payment-card {
        padding: 20px;
    }

    .modal-qrcode {
        width: 200px;
        height: 200px;
    }

    .sponsor-container {
        padding: 20px 15px;
    }
}