/* Header */
header {
    padding: 2rem 2rem 1.5rem 2rem;
    border-bottom: 1px solid rgba(90, 140, 200, 0.25);
}

/* Main content container */
main {
    max-width: 900px;
    margin: 3rem auto;
    padding: 0 2rem;
}

.main-card {
    background: rgba(18, 18, 28, 0.85);
    border-radius: 10px;
    box-shadow: 0 6px 25px rgba(74, 168, 255, 0.15);
    backdrop-filter: blur(4px);
    position: relative;
}

.main-card p {
    color: #c0c0d0;
    margin-bottom: 1rem;
    line-height: 1.6;
}

/* Content card */
.content-card {
    padding: 1.5rem 2.5rem;
    margin-bottom: 2rem;
    border: 1px solid #1c1c28;
}

.content-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    height: 4px;
    width: 100%;
    background: linear-gradient(90deg, #4aa8ff, #9ad4ff);
    opacity: 0.25;
    border-radius: 10px 10px 0 0;
}

.content-card h3 {
    font-size: 1.5rem;
    color: #d3e7ff;
    margin-bottom: 1rem;
}

/* Donation button section */
.donate-section {
    text-align: center;
    background: rgba(18, 18, 28, 0.85);
    border-radius: 10px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    box-shadow: 0 6px 25px rgba(74, 168, 255, 0.15);
    backdrop-filter: blur(4px);
    border: 1px solid #4aa8ff;
    position: relative;
}

.donate-section::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    height: 4px;
    width: 100%;
    background: linear-gradient(90deg, #4aa8ff, #9ad4ff);
    opacity: 0.5;
    border-radius: 10px 10px 0 0;
}

.donate-section h3 {
    font-size: 1.5rem;
    color: #d3e7ff;
    margin-bottom: 1.5rem;
}

.donate-section p {
    color: #c0c0d0;
    margin-bottom: 1.5rem;
}

.paypal-button {
    display: inline-block;
    padding: 1rem 2rem 0.5rem 2rem;
    background: rgba(74, 168, 255, 0.15);
    border: 2px solid #4aa8ff;
    border-radius: 8px;
    transition: all 0.3s;
}

.paypal-button:hover {
    background: rgba(74, 168, 255, 0.25);
    box-shadow: 0 0 15px #4aa8ff;
    transform: translateY(-2px);
}

/* Thank you section */
.thank-you {
    text-align: center;
    padding: 2rem;
    color: #c0c0d0;
}

.thank-you p {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

main .signature {
    font-size: 1.1rem;
    color: #8ea5bb;
    font-style: italic;
}

/* Responsive */
@media (max-width: 768px) {
    .page-title {
        font-size: 2rem;
    }

    .main-card,
    .content-card,
    .donate-section {
        padding: 1.5rem;
    }

    nav {
        gap: 1rem;
        font-size: 0.9rem;
    }
}