* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body,html {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    width: 100%;
    margin: 0;
    padding: 0;
    background: #f5f5f5;
}
.content-fix h2{
    justify-self: center;
}
.header-top {
    background: white;
    position: fixed;
    width: 100%;
    height: 115px;
    top: 0;
    left: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
}
.logo img{
    width: 120px;
}
nav {
    display: flex;
    height: 115px;
    justify-content: space-between;
    align-items: center;
}
.menu-container{
    margin-right: 20px;
}
nav ul li a {
    position: relative;
    display: inline-block;
    font-size: 18px;
    color: black;
    text-decoration: none;
    font-weight: 500;
    opacity: 75%;
}

/* Hover đổi màu chữ */
nav ul li a:hover {
    border-bottom: none;
    color: #14545f;
}

/* Gạch chân hiệu ứng */
nav ul li a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 1px; /* Gạch gần sát chữ */
    width: 100%;
    height: 2px;
    background-color: #14545f;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease-in-out;
}

/* Hover kích hoạt hiệu ứng */
nav ul li a:hover::after {
    transform: scaleX(1);
}
/* Menu mặc định ẩn */
.menu {
    position: absolute;
    top: 100px;
    left: 0;
    height: 100vh;
    background: white;
    display: none;
    box-shadow: 1px 3px 3px 1px rgba(0.2, 0.2, 0.4, 0.2);
    width: auto;
    padding: 25px 0 30px 0;
    text-align: center;
    border-radius: 5px;
    z-index: 99;
}

.text-fix{
    font-family: 'Roboto', sans-serif;
    font-size: 18px;
    font-weight: 400;
    padding: 10px;
}
@keyframes slideIn {
    0% {
        transform: translateX(100%);
        opacity: 0;
    }
    100% {
        transform: translateX(0);
        opacity: 1;
        pointer-events: auto;
    }
}

@keyframes slideOut {
    0% {
        transform: translateX(0);
        opacity: 1;
    }
    100% {
        transform: translateX(100%);
        opacity: 0;
        pointer-events: none;
    }
}

.menu li {
    list-style-type: none;
    padding: 12px;
    margin: 0;
    cursor: pointer;
    border-bottom: 1px solid lightgray;
}

/* Responsive: Khi màn hình >= 768px */
@media screen and (min-width: 768px) {
    #menu-toggle {
        display: none; /* Ẩn icon menu trên PC */
    }

    .menu {
        display: flex !important;  /* Hiển thị menu luôn */
        position: static;          /* Không cần absolute */
        top: auto;
        height: 0;
        box-shadow: none;
        background: none;
        padding: 0;
        flex-direction: row;
        align-items: center;
    }

    .menu li {
        padding: 0 10px;
        margin: 0;
    }

    nav ul li a {
        border-bottom: none; /* Xóa border khi sang PC */
    }
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.content-fix {
    max-width: 800px;
    width: 100%;
    text-align: left;
}
.content-fix p{
    padding: 10px;
}
.intro-1 h2{
    color:#14545f;
    margin: 40px;
    text-align: center;
}
.intro-1 h3{
    margin: 0 0 0 20px;
}
.container-1{
    display: flex;
    flex-direction: column;
    align-items: center;
}
.khoa-hoc{
    max-width: 700px;
    width: 100%;
    text-align: center;
}
.khoa-hoc p{
    margin: 20px;
}
.khoa-hoc h2{
    font-size: 33px;
    color: #115964;
    margin: 30px;
}
.khoa-hoc h3{
    font-size: 22px;
    margin: 0 0 0 20px;
}
.khoa-hoc img{
    margin: 20px 0 20px 0;
}
.khoa-hoc span {
    background: linear-gradient(50deg, #1560bd, darkgreen);
    color: white;
    border-radius: 25px;
    padding: 12px 20px;
    width: auto;
    margin: 10px;
    font-weight: bold;
    font-size: 16px;
    display: inline-block;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.7);
    transition: transform 0.3s, box-shadow 0.3s;
}
.khoa-hoc span:hover {
    transform: scale(1.1);
    box-shadow: 0px 6px 15px rgba(0, 0, 0, 0.3);
    border: 2px solid white;
}
.contact {
    background: #e9ecef;
    padding: 20px 0;
    text-align: center;
}
.contact h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #1a2a44;
}
.content-text{
    display: flex;
    text-align: center;
    align-items: center;
    color:#ffd3a5;
    justify-self: center;
    background: linear-gradient( #14545f, #1f404c);
    width: auto;
    height: 120px;
    box-shadow: 10px 10px 10px rgba(0, 0, 0, 0.5);
}
#dang-ky {
    padding: 10px 25px;
    font-size: 26px;
    font-weight: bold;
    width: 180px;
    height: 50px;
    background-color: #840016;
    color: white;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}
#dang-ky:hover {
    background-color: #4CAF50;
}
@keyframes shake {
    0% {
        transform: scale(1);
    }
    25% {
        transform: scale(1.2) rotate(5deg);
    }
    50% {
        transform: scale(0.9) rotate(-5deg);
    }
    75% {
        transform: scale(1.1) rotate(3deg);
    }
    100% {
        transform: scale(1) rotate(0deg);
    }
}
#dang-ky {
    animation: shake 2s infinite;
}
#dang-ky:hover{
    transform: scale(1.05);
    background-color: darkgreen;
}
.button-1{
    display: flex;
    justify-content: center;
}
.contact-wrapper {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}
.contact-wrapper h2{
    text-align: center;
    margin-bottom: 15px;
    font-size: 30px;
}
.contact-wrapper p{
    text-align: center;
}
.contact form {
    width: 380px;
    text-align: left;
}
.contact input, .contact textarea {
    width: 100%;
    padding: 12px;
    margin-bottom: 10px;
    border: none;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}
.contact textarea {
    height: 120px;
    resize: none;
}
.contact-info {
    max-width: 300px;
    text-align: left;
}
.contact-info p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}
.btn {
    display: inline-block;
    padding: 12px 25px;
    background: #00aaff;
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: bold;
    transition: background 0.3s;
}
.btn:hover {
    background: #0088cc;
}
.logo-header{
    text-decoration: none;
    color:aqua;
    font-size: 35px;
}
.icon-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    z-index: 900;
}
.icon {
    width: 60px;
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    animation: bellShake 1.5s ease-in-out infinite;
}
.icon img {
    width: 45px;
    height: 45px;
    position: relative;
    z-index: 2;
    border-radius:50%;
    animation: bellSpin 1.5s ease-in-out infinite;
}
.register {
    background: transparent;
}
.icon.register {
    width: 60px;
    height: 60px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    animation: bellShake 1.5s ease-in-out infinite;
}
.icon.register img {
    width: 45px;
    height: 45px;
    position: relative;
    z-index: 2;
    border-radius: 50%;
    animation: bellSpin 1.5s ease-in-out infinite;
}
.icon::before {
    content: '';
    position: absolute;
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, rgba(255, 255, 255, 0) 75%);
    animation: glow 2s ease-in-out infinite;
    z-index: 1;
}
.facebook, .zalo {
    background: transparent;
}
.icon::before {
    content: '';
    position: absolute;
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.3) 0%, rgba(255, 255, 255, 0) 75%);
    animation: glow 2s ease-in-out infinite;
    z-index: 1;
}
@keyframes rainbowShift {
    0% { background-position: 0% 0%; }
    50% { background-position: 100% 0%; }
    100% { background-position: 0% 0%; }
}
@keyframes bellShake {
    0% { transform: rotate(0deg); }
    10% { transform: rotate(15deg); }
    20% { transform: rotate(-15deg); }
    30% { transform: rotate(10deg); }
    40% { transform: rotate(-10deg); }
    50% { transform: rotate(5deg); }
    60% { transform: rotate(-5deg); }
    70% { transform: rotate(2deg); }
    80% { transform: rotate(-2deg); }
    100% { transform: rotate(0deg); }
}
@keyframes bellSpin {
    0% { transform: rotate(0deg); }
    10% { transform: rotate(10deg); }
    20% { transform: rotate(-10deg); }
    30% { transform: rotate(8deg); }
    40% { transform: rotate(-8deg); }
    50% { transform: rotate(4deg); }
    60% { transform: rotate(-4deg); }
    70% { transform: rotate(2deg); }
    80% { transform: rotate(-2deg); }
    100% { transform: rotate(0deg); }
}
@keyframes glow {
    0%, 100% { transform: scale(0.8); opacity: 0.5; }
    50% { transform: scale(1.2); opacity: 0.8; }
}
.particle {
    position: absolute;
    width: 5px;
    height: 5px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    pointer-events: none;
    z-index: 3;
}
.footer {
    background-color: #1a2a44;
    color: white;
    text-align: center;
    font-size: 14px;
    padding:15px 0 0 0;
    bottom: 0;
    left: 0;
}
.footer img{
    margin: 10px 0 20px 0;
}
.footer-1{
    border-top: 1px solid grey;
}
.footer p{
    opacity: 70%;
    margin: 4px;
}
.footer h1{
    color:aqua;
    margin: 0 0 10px 0;
}
.footer a{
    text-decoration: none;
    color: #00aaff;
}
.footer-1 a{
    text-decoration: none;
}
form {
    width: 100%;
    margin: auto;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 8px;
    background: white;
}
input, textarea {
    width: 100%;
    height: 45px;
    margin: 8px 0;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 17px;
    font-family: Arial, Helvetica, sans-serif;
}
#submit {
    width: 100%;
    height: 50px;
    padding: 12px;
    background: black;
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 4px;
}
#submit:hover {
    background: darkgreen;
    transform: scale(1.05);
}
iframe {
    margin-top: 20px;
    border-radius: 8px;
    width: 100%;
    height: 50vh;
}
@media (max-width: 767px) {
    #menu-items{
        width: 15rem;
    }
    hr{
        justify-self: center;
        width: 95%;
    }
    .popup-form{
        width: 400px;
    }
}
@media (max-width: 460px) {
    .slideshow-container{
        height: 30vh;
    }
    hr{
        justify-self: center;
    }
    .content-text{
        width: 95%;
    }
}

@media (max-width: 600px) {
    .prev, .next {
        font-size: 30px;
        padding: 8px 12px;
    }
}
@media (max-width: 899px) {
    .img-footer{
        width: 100%;
    }
    .content-img{
        margin-top: 20vh;
    }
    .img-noi-quy{
        width: 65%;
    }
    .img-so-do{
        width: 65%;
    }
    nav{
        display: flex;
        justify-self: center;
        width: 100%;
    }
    .menu-container ul{
        width: 100%;
    }

}
@media (min-width: 900px) {
    .table-student{
        overflow-x: auto;
    }
    .highlight{
        width: 78%;
    }
    .highlight-content{
        display: flex;
        flex-direction: column;justify-self: center;
        justify-content: center;
        width: 80%;
    }
    .ds-gv{
        width: 65%;
    }
    .contact form {
        width: 550px;
        text-align: left;
    }
    .img-footer{
        width: 65%;
    }
    .content-img{
        margin-top: 12%;
    }
    .img-noi-quy{
        width: 60%;
    }
    .img-so-do{
        width: 60%;
    }
    .text-fix-1{
        display: flex;
        flex-direction: column;
        width: 60%;
        justify-self: center;
    }
    .slideshow-container{
        height: 60vh;
    }
    nav{
        display: flex;
        justify-self: center;
        justify-content: space-around;
        width: 80%;
    }
    .menu-container ul{
        width: 100%;
    }
    iframe {
        height: 50vh;
    }
}
@media (min-width: 1200px) {
    .highlight{
        width: 55%;
    }
    .highlight-content{
        display: flex;
        flex-direction: column;justify-self: center;
        justify-content: center;
        width: 58%;
    }
    .contact form {
        width: 550px;
        text-align: left;
    }
    .img-footer{
        width: 40%;
    }
    .content-img{
        margin-top: 8%;
    }
    .img-noi-quy{
        width: 30%;
    }
    .img-so-do{
        width: 30%;
    }
    nav{
        display: flex;
        justify-self: center;
        justify-content: space-around;
        width: 65%;
    }
    .menu-container ul{
        width: 100%;
    }
    iframe {
        height: 50vh;
    }
}

.error-message {
    color: red;
    font-size: 12px;
    margin-top: 5px;
}
.img-content{
    justify-content: center;
}
.cookie-banner {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: #222;
    color: white;
    padding: 15px;
    border-radius: 5px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    z-index: 800;
}
.cookie-banner button {
    margin-left: 10px;
    padding: 5px 10px;
    border: none;
    cursor: pointer;
}
#accept-cookies {
    background: #4CAF50;
    color: white;
}
#decline-cookies {
    background: #f44336;
    color: white;
}
.img-gv img{
    margin-bottom: auto;
}
.img-gv-1{
    position: relative;
    top: 50px;
}
.overlay {
    position: fixed;
    top: 105px;
    left: 0;
    width: 100%;
    height: calc(100% - 100px);
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    visibility: hidden;
    opacity: 0;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: 999;
}
.overlay.active {
    visibility: visible;
    opacity: 1;
}
.popup-form {
    background: white;
    padding: 10px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.3);
    position: relative;
    width: 95%;
    max-width: 900px;
    max-height: 70vh;
    overflow-y: auto;
}

.popup-form::-webkit-scrollbar {
    width: 8px;
}
.popup-form::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}
.popup-form::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 10px;
}
.popup-form::-webkit-scrollbar-thumb:hover {
    background: #555;
}
.close-btn {
    position: absolute;
    right: 0;
    width: 55px;
    font-size: 24px;
    cursor: pointer;
}
.close-btn:hover{
    color: red;
}
.popup-form input,
.popup-form textarea {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 5px;
}
.popup-form button {
    background: black;
    color: white;
    font-size: 16px;
    border: none;
    padding: 15px;
    width: 100%;
    border-radius: 5px;
    cursor: pointer;
}
.popup-form button:hover{
    background-color: #4CAF50;
}

.danh-sach-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 5px 5px;
    overflow-x: auto;
    overflow-y: auto;
    max-height: 600px;
    border: 1px solid #ccc;
    box-sizing: border-box;
}

/* Tiêu đề */
.danh-sach-container h2 {
    text-align: center;
    padding: 20px;
    margin: 0;
    color: #15515d;
}
#searchInput {
    margin-bottom: 10px;
    padding: 5px;
    width: 270px;
    border-radius: 4px;
    border: 1px solid #ccc;
}
.search-student{
    text-align: center;
}
.search-container{
    display: flex;
    align-items: center;
}
/* Bọc bảng để căn giữa bảng */
.table-student {
    display: flex;
    flex-direction: column;
    justify-self: center;
    height: 40vh;
    width: 90%;
    overflow-x: auto;
}

/* Bảng */
.table-student table {
    border-collapse: collapse;
    min-width: 700px; /* đủ để không bị mất nội dung trên mobile */
    margin: 0 auto; /* căn giữa bảng */
    text-align: center;
}

/* Header và ô */
.table-student th,
.table-student td {
    border: 1px solid #ccc;
    padding: 5px;
    text-align: center;
}

/* Sticky header */
.table-student thead th {
    position: sticky;
    top: 0;
    background-color: white;
    z-index: 1;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    font-size: 13px;
}

tbody tr td {
    font-size: 12px;
}

#googleForm textarea{
    height: 150px;
}
.slideshow-container {
    justify-self: center;
    width: 100%;
    max-width: 800px;
    margin-top: 20vh;
    overflow: hidden;
    position: relative;
}
.slideshow-container img {
    width: 100%;
    object-fit: contain;
    position: absolute;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}
.slideshow-container img.active {
    opacity: 1;
}
.img-khai{
    margin: 0 0 50px 0;
}
img {
    display: flex;
    justify-self: center;
    transition: transform 0.3s ease-in-out;
}
img:hover {
    transform: scale(1.1);
}
.gia-tri{
    justify-self: center;
    color:white;
    background-color: #14545f;
    height: 150px;
    width: auto;
    align-content: center;
    text-align: center;
    border-radius:10px;
    margin: 25px;
    box-shadow: 10px 10px 10px rgba(0, 0, 0, 0.5);
}
.gia-tri p{
    display: flex;
    justify-self: center;
}
.gia-tri h3{
    margin: 15px;
}
.gia-tri-2{
    display: flex;
    justify-self: center;
    margin: 40px 0 40px 0;
    box-shadow: 10px 10px 10px rgba(0, 0, 0, 0.5);
}
.dngv{
    margin-top: 3rem;
}
.dngv-1{
    margin-bottom: 2rem;
}

.highlight {
    font-weight: bold;
    text-wrap: auto;
    margin: 10px auto;
    text-align: center;
}
ul {
    padding-left: 20px;
}

.thi-thu-container{
    padding: 10px;
    width: 100%;
    margin-top: 15vh;
}

.thi-thu-container h2{
    padding: 20px;
    color: #f44336;
}
.highlight-content{
    padding: 15px;
}

.date-color{
    color:#f44336;
}

.marquee-wrapper {
    position: fixed;
    top: 100px; /* điều chỉnh cho phù hợp với chiều cao menu */
    width: 100%;
    overflow: hidden;
    background: #fefefe;
    border-top: 1px solid #ccc;
    border-bottom: 1px solid #ccc;
}

.marquee-content {
    display: inline-block;
    white-space: nowrap;
    padding: 10px 0;
    font-size: 16px;
    animation: marquee 15s linear infinite;
}

.marquee-link {
    color: #0d47a1;
    text-decoration: none;
    font-weight: bold;
}

.marquee-link:hover {
    text-decoration: underline;
}

@keyframes marquee {
    0% { transform: translateX(200%); }
    100% { transform: translateX(-100%); }
}
.marquee-content {
    animation: marquee 25s linear infinite;
    animation-delay: -5s;
}
.dau-do{
    display: flex;
    justify-content: right;
    width: 85%;
}

.refresh-icon {
    margin-left: 10px;
    cursor: pointer;
    color: #333;
    font-size: 18px;
    transition: transform 0.3s ease;
}

.refresh-icon:hover {
    transform: rotate(100deg);
    color: #007bff;
}