/* Nền ngoài toàn trang */
html {
    user-select: none;
    background-color: #aaaaaa;
    margin: 0;
    padding: 0;
}

body {
    /* Font chữ */
    font-family: Verdana, Arial, Helvetica, sans-serif;
    font-size: 13px;
    line-height: 1.6;
    
    /* Căn giữa khung nội dung */
    margin: 0 auto; 
    max-width: 700px; 
    padding: 5px;

    /* Màu nền bên trong khung nội dung */
    background-color: #ddd;
    color: #000;
    
    /* Hiệu ứng viền */
    border: 2px solid #fff;
    border-radius: 2px;
    box-shadow: rgba(0, 0, 0, 0.3) 0px 19px 38px, rgba(0, 0, 0, 0.22) 0px 15px 12px;
}

/* Liên kết */
a {
    color: #0000ee;
    text-decoration: none;
    font-weight: none;
}

/* Đường kẻ ngăn cách */
hr {
    border: 0;
    border-top: 1px solid #888;
    border-bottom: 1px solid #fff;
    margin: 8px 0;
}

/* Tiêu đề */
.header {
    background: linear-gradient(rgba(26, 58, 109, 0.8), rgba(26, 58, 109, 0.8)), url('../img/background.png');
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center 40%;
    background-blend-mode: multiply;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 1), inset 0 -2px 5px rgba(255, 255, 255, 0.1);
    border: 1px solid #2E2EFF;
    text-align: center;
    color: #fff;
    padding: 70px;
}

/* Tiêu đề chính */
.title {
    font-size: 22px;
    text-decoration: underline;
    text-transform: uppercase;
    text-shadow: 0 2px 4px rgba(0,0,0,0.6);
}
.title a {
    color: #fff;
}

/* Bản quyền */
.footer {
    text-align: center;
    padding: 14px;
    color: #FFF;
    background: linear-gradient(to bottom, #000075, #0000b3);
}

/* Khung nội dung */
.content-box {
    background: linear-gradient(to bottom, #fffdf6, #f4efe2);
    border: 1px solid #8fbc8f;
    padding: 10px 12px;
    margin: 5px 0;
    color: #001A00;
    box-shadow: inset 0 1px 0 #ffffff;
}
.content-box b {
    display: block;
    background: linear-gradient(to bottom, #4caf50, #2e7d32);
    color: #ffffff;
    padding: 6px 8px;
    margin: -11px -13px -8px;
    border: 1px solid #1b5e20;
}

/* Nút bấm */
button {
    padding: 2px 12px;
    border: 1px solid #999;
    background: linear-gradient(#2d6bb3, #1c3f8c);
    color: white;
    cursor: pointer;
}
button:hover {
    background: linear-gradient(#3b7bcb, #204aa3);
}

/* Menu Item */
.section-title {
    background: linear-gradient(#2d6bb3, #1e4f8c);
    border: 1px solid #2E2EFF;
    color: white;
    padding: 6px 10px;
    font-weight: bold;
}
.menu-item {
    background: linear-gradient(#ffffff,#f0f0f0 40%,#e0e0e0 100%);
    padding: 4px 10px;
    border-left: 1px solid #ccc;
    border-right: 1px solid #ccc;
    border-top: 1px solid #fff;
    border-bottom: 1px solid #ccc;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

/* Khung */
.box {
    padding: 10px;
    border: 1px solid #ccc;
    background: linear-gradient(#f8f8f8, #e6e6e6);
}

/* Tìm kiếm */
.search {
    padding: 10px;
    margin: 5px 0;
    border: 1px solid #ffffff;
    background: linear-gradient(to top, #b7d5fd, #97bcff);
    text-align: center;
}
.search input {
    padding: 2px;
    width: 30%;
    border: 1px solid #999;
    outline: none;
}

.highlight {
    font-weight: bold;
}