*{margin:0;padding:0;box-sizing:border-box;font-family:Arial,sans-serif;}
body{background:#111;color:#fff;}

/* Banner */
.banner{width:100%;padding:15px 20px;display:flex;align-items:center;justify-content:space-between;
    font-size:18px;font-weight:bold;color:#fff;
    background:linear-gradient(270deg,#2c003e,#00334d,#222,#111,#2c003e);
    background-size:400% 400%;animation:gradientMove 8s ease infinite;
    box-shadow:0 4px 15px rgba(0,0,0,0.6);position:fixed;top:0;left:0;z-index:1000;}
.banner-left{display:flex;align-items:center;gap:12px;font-size:20px;letter-spacing:1px;text-transform:uppercase;}
.banner img{height:40px;width:auto;filter:drop-shadow(0 0 6px #00d9ff) drop-shadow(0 0 12px #00d9ff);}
.banner-right{display:flex;gap:0;}
.banner-right a{color:#fff;text-decoration:none;font-size:16px;padding:5px 15px;border-left:1px solid rgba(255,255,255,0.3);transition:0.3s;}
.banner-right a:first-child{border-left:none;}
/*.banner-right a:hover{background:rgba(255,255,255,0.1);color:#fffd44;text-shadow:0 0 8px #fffd44;}*/
/* Hover & Active không đổi nền nữa, chỉ làm chữ sáng hơn */
.banner-right a:hover {
    text-shadow: 0 0 10px rgba(255,255,255,0.9);
    transform: translateY(-2px);
}
/*.banner-right a.active,.overlay a.active{background:rgba(255,255,255,0.15);color:#fffd44;text-shadow:0 0 8px #fffd44;font-weight:bold;}*/
.banner-right a.active,
.overlay a.active {
    text-shadow: 0 0 12px rgba(255,255,255,1);
    font-weight: bold;
}
.hamburger{display:none;font-size:28px;cursor:pointer;}
 
/* Overlay menu */
.overlay{height:100%;width:0;position:fixed;top:0;right:0;background:rgba(0,0,0,0.95);
    overflow-x:hidden;transition:0.5s;z-index:2000;padding-top:60px;}
.overlay.show{width:70%;}
.overlay a{display:block;padding:15px 25px;font-size:20px;color:#fff;text-decoration:none;border-bottom:1px solid rgba(255,255,255,0.2);}
.overlay a:hover{background:rgba(255,255,255,0.1);color:#fffd44;text-shadow:0 0 8px #fffd44;}
.overlay .closebtn{position:absolute;top:20px;right:30px;font-size:40px;color:white;cursor:pointer;}

/* Responsive banner */
@media(max-width:768px){.banner-right{display:none;}.hamburger{display:block;}}

@keyframes gradientMove{0%{background-position:0% 50%;}50%{background-position:100% 50%;}100%{background-position:0% 50%;}}

/* Trang chủ - Card */
.container{max-width:1200px;margin:120px auto 40px;display:grid;grid-template-columns:repeat(3,1fr);gap:20px;padding:0 15px;}
.card{background:#222;border-radius:12px;overflow:hidden;box-shadow:0 4px 12px rgba(0,0,0,0.5);transition:transform 0.3s;}
.card:hover{transform:translateY(-5px);}
.card img{width:100%;height:180px;object-fit:cover;}
.card .content{padding:15px;}
.card .content h3{margin-bottom:10px;color:#fffd44;font-size:18px;}
.card .content p{font-size:14px;line-height:1.5;color:#ccc;}
@media(max-width:992px){.container{grid-template-columns:repeat(2,1fr);}}
@media(max-width:600px){.container{grid-template-columns:1fr;}}

/* Form login */
.box{position:relative;width:320px;padding:40px;background:#1e1e1e;border-radius:20px;overflow:hidden;color:#fff;text-align:center;margin:120px auto 40px;}
.box::before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;
    background:conic-gradient(#ff0057,#00d9ff,#fffd44,#00ff87,#ff0057);
    animation:rotate 6s linear infinite;z-index:0;}
.box::after{content:"";position:absolute;inset:4px;background:#1e1e1e;border-radius:16px;z-index:1;}
@keyframes rotate{0%{transform:rotate(0deg);}100%{transform:rotate(360deg);}}
.box h2{position:relative;z-index:2;margin-bottom:20px;font-size:24px;}
.input-box{position:relative;z-index:2;margin:15px 0;}
.input-box input{width:100%;padding:12px 40px 12px 15px;border:2px solid #555;border-radius:25px;background:transparent;color:#fff;}
.input-box input:focus{border-color:#00d9ff;box-shadow:0 0 12px #00d9ff;}
.toggle-password{position:absolute;top:50%;right:15px;transform:translateY(-50%);cursor:pointer;color:#aaa;}
.btn{width:100%;padding:12px;margin-top:20px;background:#00d9ff;border:none;border-radius:25px;cursor:pointer;font-size:16px;font-weight:bold;color:#111;transition:0.3s;}
.btn:hover{background:#ff0057;color:#fff;}
.links{position:relative;z-index:2;margin-top:15px;font-size:14px;}
.links a{color:#00d9ff;text-decoration:none;margin:0 10px;}
.links a:hover{color:#ff0057;}
/* Nút Sign In đẹp hơn */
.btn {
    width: 100%;
    padding: 12px;
    margin-top: 20px;
    background: linear-gradient(90deg, #ff5722, #ff9800);
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 18px;
    font-weight: bold;
    color: #fff;
    letter-spacing: 1px;
    transition: 0.3s;
    position: relative;
    z-index: 2;
}

.btn:hover {
    background: linear-gradient(90deg, #e64a19, #f57c00);
    box-shadow: 0 0 12px rgba(255, 152, 0, 0.8);
    transform: translateY(-2px);
}
/* Toàn trang nền */
body {
    margin: 0;
    font-family: Arial, sans-serif;
    color: #fff;
    min-height: 100vh;
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
}

/* Hiệu ứng chuyển màu gradient */
@keyframes gradientBG {
    0% {background-position: 0% 50%;}
    50% {background-position: 100% 50%;}
    100% {background-position: 0% 50%;}
}

/* Banner */
.banner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 30px;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(5px);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.banner-left img {
    height: 50px;
    margin-right: 10px;
}

/*.banner-left span {*/
/*    font-size: 20px;*/
/*    font-weight: bold;*/
/*    color: #ff9800;*/
/*}*/
.banner-left span {
    font-size: 22px;
    font-weight: bold;
    background: linear-gradient(270deg, #ff5722, #ff9800, #00d9ff, #fffd44, #ff0057);
    background-size: 600% 600%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradientText 8s ease infinite;
    text-shadow: 2px 2px 8px rgba(0,0,0,0.6);
}
/* Hiệu ứng gradient động */
@keyframes gradientText {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}
/*.banner-right a {*/
/*    margin: 0 12px;*/
/*    text-decoration: none;*/
/*    color: #fff;*/
/*    font-weight: 500;*/
/*    transition: 0.3s;*/
/*}*/

/*.banner-right a:hover {*/
/*    color: #ff9800;*/
/*    text-shadow: 0 0 8px #ff9800;*/
/*}*/
.banner-right a {
    margin: 0 12px;
    text-decoration: none;
    font-weight: bold;
    font-size: 16px;
    position: relative;
    background: linear-gradient(270deg, #ff5722, #ff9800, #00d9ff, #fffd44, #ff0057);
    background-size: 600% 600%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradientMenu 8s ease infinite;
    transition: 0.3s;
    text-shadow: 2px 2px 6px rgba(0,0,0,0.5);
}

.banner-right a:hover {
    text-shadow: 0 0 10px #fff;
    transform: translateY(-2px);
}

/* Hiệu ứng gradient chạy */
@keyframes gradientMenu {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* Container hiển thị card */
.container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    padding: 40px;
}

.card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
    backdrop-filter: blur(8px);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.6);
}

.card img {
    width: 100%;
    display: block;
}

.card .content {
    padding: 15px;
}

/* Nền nhiều màu
body {
    margin: 0;
    font-family: Arial, sans-serif;
    color: #fff;
    min-height: 100vh;
    background: linear-gradient(270deg, #ff6ec4, #7873f5, #4ade80, #facc15, #f97316, #06b6d4);
    background-size: 1200% 1200%;
    animation: rainbowBG 20s ease infinite;
}

/* Hiệu ứng chuyển màu
@keyframes rainbowBG {
    0% {background-position: 0% 50%;}
    50% {background-position: 100% 50%;}
    100% {background-position: 0% 50%;}
}
*/
/* Nền nhiều màu tối */
body {
    margin: 0;
    font-family: Arial, sans-serif;
    color: #fff;
    min-height: 100vh;
    /* background: linear-gradient(270deg, #0f172a, #1e293b, #334155, #3b0764, #1e3a8a, #0f766e);*/
    /*background: linear-gradient(*/
    /*        270deg,*/
    /*        #020617,  !* xanh đen rất tối *!*/
    /*        #0f172a,  !* navy đậm *!*/
    /*        #1e293b,  !* xám xanh đậm *!*/
    /*        #1e1b4b,  !* tím than tối *!*/
    /*        #1e3a8a,  !* xanh dương đậm *!*/
    /*        #064e3b   !* xanh ngọc đậm *!*/
    /*);*/

    /*background: linear-gradient(*/
    /*        270deg,*/
    /*        #0f172a,  !* navy đen *!*/
    /*        #1e293b,  !* slate tối *!*/
    /*        #3b0764,  !* tím neon *!*/
    /*        #1e3a8a,  !* xanh neon *!*/
    /*        #0e7490,  !* teal sáng *!*/
    /*        #14b8a6   !* aqua nổi bật *!*/
    /*);*/

    background: linear-gradient(
            270deg,
            #0a0f1c,  /* xanh navy đen */
            #111827,  /* neutral tối */
            #1f2937,  /* slate gray */
            #2d3748,  /* xám xanh chuyên nghiệp */
            #1e40af,  /* xanh corporate */
            #0f766e   /* teal business */
    );


    background-size: 1200% 1200%;
    animation: darkRainbowBG 30s ease infinite;
}

/* Hiệu ứng chuyển màu tối */
@keyframes darkRainbowBG {
    0% {background-position: 0% 50%;}
    50% {background-position: 100% 50%;}
    100% {background-position: 0% 50%;}
}

/* Card */
/*.container {*/
/*    display: grid;*/
/*    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));*/
/*    gap: 20px;*/
/*    padding: 20px;       !* giảm padding tổng thể *!*/
/*    margin-top: 20px;    !* khoảng cách với slider *!*/
/*}*/
.container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    max-width: 1200px;    /* bằng slider */
    margin: 20px auto 40px; /* canh giữa */
    padding: 0;           /* bỏ padding ngang */
}

.card {
    background: rgba(255, 255, 255, 0.12);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
    backdrop-filter: blur(8px);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.6);
}

.card img {
    width: 100%;
    display: block;
}

.card .content {
    padding: 15px;
    color: #fff;
}
/* Footer */
.footer {
    background: rgba(0, 0, 0, 0.85);
    padding: 30px 20px 10px;
    color: #ddd;
    font-size: 14px;
    margin-top: 40px;
}

.footer-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    max-width: 1200px;
    margin: auto;
    gap: 30px;
}

.footer-section {
    flex: 1 1 250px;
}

.footer-section h3 {
    color: #ff9800;
    margin-bottom: 12px;
    font-size: 16px;
    text-transform: uppercase;
}

.footer-section p,
.footer-section a {
    color: #ddd;
    text-decoration: none;
    line-height: 1.6;
    font-size: 14px;
}

.footer-section a:hover {
    color: #ff9800;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 8px;
}

.footer-bottom {
    text-align: center;
    margin-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.2);
    padding-top: 10px;
    font-size: 13px;
    color: #aaa;
}

/* Slider-sau banner */
.slider-wrapper {
    max-width: 1200px;
    margin: 40px auto 20px; /* gần hơn: top 100px thay vì 120px, bottom 20px thay vì 40px */
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.slider {
    display: flex;
    transition: transform 0.6s ease-in-out;
}

.slide {
    min-width: 100%;
    transition: opacity 0.5s;
}

.slide img {
    width: 100%;
    display: block;
    border-radius: 12px;
}

/* Nút điều khiển */
.slider-controls {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    transform: translateY(-50%);
    padding: 0 15px;
}

.slider-controls span {
    cursor: pointer;
    font-size: 32px;
    color: #fff;
    background: rgba(0,0,0,0.4);
    border-radius: 50%;
    padding: 5px 12px;
    transition: 0.3s;
}

.slider-controls span:hover {
    background: rgba(0,0,0,0.7);
}