*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family: "Segoe UI", Arial, sans-serif;
}

html{
    scroll-behavior:smooth;
}

body{
    background:#fff5f5;
    color:#333;
}

header{
    background:linear-gradient(120deg,#8b0000,#006400);
    color:white;
    padding:25px 10px;
    text-align:center;
    font-size:28px;
    font-weight:bold;
    letter-spacing:1px;
    box-shadow:0 4px 15px rgba(0,0,0,0.25);
}

nav{
    background:#b30000;
    padding:12px;
    text-align:center;
    position:sticky;
    top:0;
    z-index:999;
    box-shadow:0 2px 8px rgba(0,0,0,0.2);
}

nav a{
    color:white;
    text-decoration:none;
    margin:0 18px;
    font-weight:bold;
    position:relative;
    transition:.3s;
}

nav a::after{
    content:"";
    position:absolute;
    left:0;
    bottom:-5px;
    width:0;
    height:2px;
    background:#00ff99;
    transition:.3s;
}

nav a:hover::after{
    width:100%;
}

nav a:hover{
    color:#00ff99;
}

.banner{
    width:100%;
    height:420px;
    background:url("dongiaothua.png") center/cover no-repeat;
    position:relative;
    animation:fade 1.2s ease;
}

.banner::after{
    content:"";
    position:absolute;
    inset:0;
    background:rgba(0,0,0,0.35);
}

.container{
    width:90%;
    margin:auto;
    padding:40px 0;
    animation:slideUp 1s ease;
}

h2{
    color:#b30000;
    margin-bottom:18px;
    border-left:6px solid #006400;
    padding-left:12px;
    font-size:26px;
}

.card{
    background:white;
    padding:22px;
    margin-bottom:22px;
    border-radius:14px;
    box-shadow:0 6px 18px rgba(0,0,0,0.12);
    transition:.35s;
}

.card:hover{
    transform:translateY(-8px) scale(1.01);
    box-shadow:0 15px 35px rgba(0,0,0,0.2);
}
.amthuc-grid h3{
    text-align:center;
    margin:12px 0 10px;
    color:#b30000;
    font-size:20px;
    letter-spacing:0.5px;
}

.grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
    gap:25px;
}

.grid img{
    width:100%;
    border-radius:12px;
    transition:.4s;
}

.grid img:hover{
    transform:scale(1.07);
}

button{
    background:linear-gradient(120deg,#006400,#00a86b);
    color:white;
    padding:11px 18px;
    border:none;
    border-radius:7px;
    cursor:pointer;
    font-weight:bold;
    transition:.3s;
}

button:hover{
    transform:scale(1.05);
    box-shadow:0 5px 15px rgba(0,0,0,0.3);
}

form input,
form textarea{
    width:100%;
    padding:11px;
    margin:12px 0;
    border-radius:6px;
    border:1px solid #ccc;
    transition:.3s;
}

form input:focus,
form textarea:focus{
    outline:none;
    border-color:#b30000;
    box-shadow:0 0 0 3px rgba(179,0,0,0.15);
}

footer{
    background:#8b0000;
    color:white;
    text-align:center;
    padding:18px;
    margin-top:30px;
    font-size:15px;
}

@keyframes fade{
    from{opacity:0;}
    to{opacity:1;}
}

@keyframes slideUp{
    from{
        opacity:0;
        transform:translateY(40px);
    }
    to{
        opacity:1;
        transform:translateY(0);
    }
}

@media(max-width:768px){

    header{
        font-size:22px;
        padding:20px 10px;
    }

    .banner{
        height:260px;
    }

    nav a{
        margin:0 10px;
        font-size:14px;
    }

    h2{
        font-size:22px;
    }
}
/* ===== GALLERY ALBUM ===== */

.gallery{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
    gap:25px;
}

.item{
    background:white;
    border-radius:14px;
    overflow:hidden;
    box-shadow:0 6px 18px rgba(0,0,0,0.15);
    transition:.35s;
    text-align:center;
}

.item:hover{
    transform:translateY(-8px);
}

.item img,
.item video{
    width:100%;
    height:220px;
    object-fit:cover;
}

.item p{
    padding:12px;
    font-weight:500;
}