/* --- TỔNG THỂ --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
}

body {
    background-color: #f8fafc;
    color: #0f172a;
    min-height: 100vh;
}

/* --- TOP BAR CHỈ CHỨA NÚT "TRANG CHỦ" --- */
.top-nav-bar {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    height: 60px;
    background-color: #ffffff;
    border-bottom: 1px solid #e2e8f0;
    display: flex;
    align-items: center;
    padding: 0 24px;
    z-index: 1000;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.btn-back-home {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: #0f172a;
    font-size: 20px;
    font-weight: 700;
    padding: 6px 12px;
    border-radius: 8px;
    transition: background-color 0.2s ease;
}

.btn-back-home:hover {
    background-color: #f1f5f9;
}

.btn-back-home i {
    font-size: 22px;
}

/* --- KHUNG BÀI VIẾT NỘI DUNG --- */
.vhu-blog-container {
    max-width: 860px;
    margin: 28px auto;
    padding: 36px;
    background: #ffffff;
    border-radius: 16px;
    border: 1px solid #e2e8f0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    line-height: 1.7;
}

.vhu-blog-title {
    font-size: 24px;
    color: #0f172a;
    margin-bottom: 20px;
    font-weight: 800;
    border-bottom: 2px solid #0066ff;
    padding-bottom: 12px;
}

.vhu-blog-lead {
    font-size: 16px;
    color: #0066ff;
    font-weight: 600;
    margin-bottom: 16px;
}

.vhu-blog-intro {
    margin-bottom: 28px;
    color: #334155;
    font-size: 14.5px;
}

/* --- CÁC MỤC ĐIỀU KHOẢN --- */
.vhu-blog-section {
    margin-bottom: 24px;
    background: #f8fafc;
    padding: 18px 20px;
    border-radius: 10px;
    border-left: 4px solid #0066ff;
}

.vhu-blog-section h2, 
.vhu-blog-footer h2 {
    font-size: 16px;
    color: #0f172a;
    margin-bottom: 10px;
    font-weight: 700;
}

.vhu-blog-section ul {
    padding-left: 20px;
}

.vhu-blog-section ul li {
    margin-bottom: 8px;
    color: #334155;
    font-size: 14px;
}

/* --- KHỐI DONATE --- */
.vhu-donate-box {
    display: flex;
    flex-wrap: wrap;
    background: #ffffff;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    padding: 20px;
    margin-top: 14px;
}

.vhu-donate-info {
    flex: 1;
    min-width: 260px;
    padding-right: 16px;
}

.vhu-donate-info h3 {
    font-size: 15px;
    color: #dc2626;
    margin-bottom: 12px;
    font-weight: 700;
}

.vhu-donate-info p {
    margin: 8px 0;
    font-size: 13.5px;
}

.vhu-btn-copy {
    background: #0066ff;
    color: #fff;
    border: none;
    padding: 4px 10px;
    font-size: 12px;
    border-radius: 4px;
    cursor: pointer;
    margin-left: 8px;
}

.vhu-donate-note {
    font-size: 12.5px;
    font-style: italic;
    color: #64748b;
    margin-top: 10px !important;
}

.vhu-donate-qrcode {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 180px;
    margin: 0 auto;
}

.vhu-donate-qrcode img {
    width: 100%;
    max-width: 150px;
    height: auto;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    padding: 4px;
}

.vhu-donate-qrcode span {
    font-size: 11.5px;
    color: #64748b;
    margin-top: 6px;
    text-align: center;
}

/* --- FOOTER ĐƠN GIẢN --- */
.vhu-blog-footer {
    border-top: 1px dashed #cbd5e1;
    padding-top: 20px;
    margin-top: 30px;
    font-size: 14px;
}

.vhu-wishes {
    font-weight: 700;
    color: #0066ff;
    font-style: italic;
    margin-top: 12px;
}

.simple-footer {
    text-align: center;
    padding: 20px 0;
    font-size: 12.5px;
    color: #64748b;
}

/* RESPONSIVE MÀN HÌNH NHỎ */
@media screen and (max-width: 768px) {
    .top-nav-bar {
        padding: 0 12px;
        height: 52px;
    }
    .btn-back-home {
        font-size: 18px;
    }
    .vhu-blog-container {
        margin: 12px;
        padding: 20px 16px;
    }
    .vhu-blog-title {
        font-size: 19px;
    }
    .vhu-donate-box {
        flex-direction: column;
        padding: 14px;
    }
    .vhu-donate-info {
        padding-right: 0;
        margin-bottom: 16px;
    }
}