/* Importing Google fonts */

@import url('https://fonts.googleapis.com/css2?family=Miniver&family=Poppins:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap');
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Poppins", sans-serif;
}

:root {
    /* Colors */
    --white-color: #fff;
    --dark-color: #252525;
    --primary-color: #3b141c;
    --secondary-color: #f3961c;
    --light-pink-color: #faf4f5;
    --medium-gray-color: #ccc;
    /* Font size */
    --font-size-s: 0.9rem;
    --font-size-n: 1rem;
    --font-size-m: 1.12rem;
    --font-size-l: 1.5rem;
    --font-size-xl: 2rem;
    --font-size-xxl: 2.3rem;
    /* Font weight */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    /* Border radius */
    --border-radius-s: 8px;
    --border-radius-m: 30px;
    --border-radius-circle: 50%;
    /* Site max width */
    --site-max-width: 1300px;
}


/* stylings for whole site */

ul {
    list-style: none;
}

a {
    text-decoration: none;
}

section {
    display: block;
    padding: 100px 20px;
    min-height: 100vh;
    border-bottom: 1px solid #ddd;
}

.nav-menu a {
    text-decoration: none;
    color: white;
    padding: 10px;
    display: inline-block;
}

.nav-menu a:hover {
    color: orange;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

img {
    width: 100%;
}

.section-content {
    margin: 0 auto;
    padding: 0 20px;
    max-width: var(--site-max-width);
}


/* Navbar styling */

header {
    position: fixed;
    width: 100%;
    z-index: 5;
    background: var(--primary-color);
}

.header.sticky {
    background: #ccc
}

header .navbar {
    display: flex;
    padding: 20px;
    align-items: center;
    justify-content: space-between;
}

.navbar .nav-logo .logo-text {
    color: var(--white-color);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
}

.navbar .nav-menu {
    display: flex;
    gap: 10px;
}

.navbar .nav-menu .nav-link {
    padding: 10px 18px;
    color: var(--white-color);
    font-size: var(--font-size-m);
    border-radius: var(--border-radius-m);
    transition: 0, 3s ease;
}

.navbar .nav-menu .nav-link:hover {
    color: var(--primary-color);
    background: var(--secondary-color);
}

.navbar :where(#menu-close-button,
#menu-open-button) {
    display: none;
}


/* Hero section styling */

.hero-section {
    min-height: 100vh;
    background: var(--primary-color);
}

.hero-section .section-content {
    display: flex;
    align-items: center;
    min-height: 100vh;
    color: var(--white-color);
    justify-content: space-between;
}

.hero-section .hero-details .title {
    font-size: var(--font-size-xxl);
    color: var(--secondary-color);
    font-family: "Miniver", sans-serif;
}

.hero-section .hero-details .subtitle {
    margin-top: 8px;
    max-width: 70%;
    font-size: var(--font-size-xl);
}

.hero-section .hero-details .description {
    max-width: 70%;
    margin: 24px 0 40px;
    font-size: var(--font-size-m);
}

.hero-section .hero-details .buttons {
    display: flex;
    gap: 23px;
}

.hero-section .hero-details .button {
    padding: 10px 26px;
    border: 2px solid transparent;
    color: var(--primary-color);
    border-radius: var(--border-radius-m);
    background: var(--secondary-color);
    font-weight: var(--font-weight-medium);
    transition: 0, 3s ease;
}

.hero-section .hero-details .button:hover,
.hero-section .hero-details .tu-hoc {
    color: var(--white-color);
    border-color: var(--white-color);
    background: transparent;
}

.hero-section .hero-details .contact-us:hover {
    color: var(--primary-color);
    border-color: var(--secondary-color);
    background: var(--secondary-color);
}

.hero-section .hero-image-wrapper {
    max-width: 500px;
    margin-right: 30px;
}


/*Responsive media query code for max width 900px */

@media screen and (max-width: 900px) {
     :root {
        --font-size-m: 1rem;
        --font-size-l: 1.3rem;
        --font-size-xl: 1.5rem;
        --font-size-xxl: 1.8rem;
    }
    body .show-mobile-menu header::before {
        content: "";
        position: fixed;
        left: -300px;
        top: 0;
        height: 100%;
        width: 100%;
        backdrop-filter: blur(5px);
        background: rgba(0, 0, 0, 0.2);
    }
    .navbar :where(#menu-close-button,
    #menu-open-button) {
        display: block;
        font-size: var(--font-size-l);
    }
    .navbar #menu-close-button {
        position: absolute;
        right: 30px;
        top: 30px;
    }
    .navbar #menu-open-button {
        color: var(--white-color);
    }
    .navbar .nav-menu {
        display: block;
        position: fixed;
        left: -300px;
        top: 0;
        width: 300px;
        height: 100%;
        display: flex;
        flex-direction: column;
        align-items: center;
        padding-top: 100px;
        background: var(--white-color);
        transition: left 0.2s ease;
    }
    body.show-mobile-menu .navbar .nav-menu {
        left: 0;
    }
    .navbar .nav-menu .nav-link {
        color: var(--dark-color);
        display: block;
        margin-top: 17px;
        font-size: var(--font-size-l);
    }
    .hero-section .section-content {
        gap: 50px;
        text-align: center;
        padding: 30px 20px 20px;
        flex-direction: column-reverse;
        justify-content: center;
    }
    .hero-section .hero-details :is(.subtitle,
    .description) {
        max-width: 100%;
    }
    .hero-section .hero-details .buttons {
        justify-content: center;
    }
    .hero-section .hero-image-wrapper {
        max-width: 270px;
        margin-right: 0;
    }
}

.education {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    min-height: auto;
    padding-bottom: 5rem;
}

.education .education-row {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
}

.education-row .education-column {
    flex: 1 1 20rem;
}

.education-column {
    flex: 1 1 100%;
    max-width: 100%;
    min-height: 100%;
}

.education-column .title {
    font-size: 2.5rem;
    margin: 0 0 1.5rem 2rem;
}

.education-column .education-box {
    border-left: .2rem solid var(--primary-color);
}

.education-box .education-content {
    position: relative;
    padding-left: 2rem;
}

.education-box .education-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: -1.1rem;
    width: 2rem;
    height: 2rem;
    background: var(--primary-color);
    border-radius: 50%;
}

.education-content .content {
    position: relative;
    padding: 1rem;
    border: .2rem solid var(--primary-color);
    border-radius: .5rem;
    margin-bottom: 2rem;
}

.education-content .content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    background: #f79d9d;
    z-index: -1;
    transition: .5s;
}

.education-content .content:hover::before {
    width: 100%;
}

.education-content .content .year {
    font-size: 1.5rem;
    color: var(--primary-color);
    padding-bottom: .6rem;
}

.education-content .content .year {
    padding-right: .5rem;
}

.education-content .content h3 {
    font-size: 1.8rem;
}

.education-content .content p {
    font-size: 1.2rem;
    padding-top: .5rem;
}

.contact {
    min-height: auto;
    padding-bottom: 7rem;
}

.contact form {
    max-width: 70rem;
    margin: 0 auto;
    text-align: center;
}

.contact form .input-box {
    position: relative;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}

.contact form .input-box .input-field {
    position: relative;
    width: 49%;
    margin: .8rem 0;
}

.contact form .input-box .input-field input,
.contact form .textarea-field textarea {
    width: 100%;
    height: 100%;
    padding: 1.5rem;
    font-size: 1.6rem;
    color: var(--primary-color);
    background: transparent;
    border-radius: .6rem;
    border: .2rem solid var(--primary-color);
}

.contact form .input-box .input-field input::placeholder,
.contact form .textarea-field textarea::placeholder {
    color: var(--primary-color);
}

.contact form .focus {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgb(246, 201, 201);
    border-radius: .6rem;
    z-index: -1;
    transition: .5s;
}

.contact form .input-box .input-field input:focus~.focus,
.contact form .input-box .input-field input:valid~.focus,
.contact form .textarea-field textarea:focus~.focus,
.contact form .textarea-field textarea:valid~.focus {
    width: 100%;
}

.contact form .textarea-field {
    position: relative;
    margin: .8rem 0 2.7rem;
    display: flex;
}

.contact form .textarea-field textarea {
    resize: none;
}

.contact form .btn-box.btns .btn {
    cursor: pointer;
}

.heading {
    text-align: center;
    font-size: 69px;
    color: #841713;
    font-weight: bold;
    margin-bottom: 30px;
}

.heading span {
    color: #eebc19;
}

.btn {
    background-color: #841713;
    color: #faf4f5;
    font-size: 16px;
    font-weight: bold;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
    display: block;
    width: 150px;
    margin: 20px auto;
    text-align: center;
}

.btn:hover {
    background-color: #dc4949;
    color: #faf4f5;
}


/* BREAKPOINTS */

@media (max-width: 1200) {
    html {
        font-size: 55%;
    }
}

@media (max-width: 991px) {
    .header {
        padding: 2rem 4%;
    }
}

html,
body {
    scroll-behavior: smooth;
    /* Thêm để cuộn mượt */
    overflow: auto;
    /* Đảm bảo không bị chặn */
}

@media (max-width: 462px) {
    .home-content h1 {
        font-size: 5.2rem;
    }
    .education {
        padding: 10rem 4% 5rem 5%;
    }
    .contact form .input-box .input-field {
        width: 100%;
    }
}


/* Căn giữa section */

.social-section {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    flex-direction: column;
}


/* Định dạng container chứa cả tiêu đề & nút */

.social-container {
    text-align: center;
}


/* Tiêu đề "Mạng xã hội" */

.social-title {
    font-size: 85px;
    /* Tăng kích thước chữ lớn hơn */
    font-weight: bold;
    color: #5c1111;
    /* Màu chữ */
    text-align: center;
    /* Căn giữa chữ */
    margin-bottom: 80px;
    /* Tạo khoảng cách với nút bên dưới */
    margin-top: -40px;
    /* Đẩy chữ lên trên */
}


/* Nút Facebook */

.privacy-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: #2D4A8A;
    color: #fff;
    padding: 12px 20px;
    font-size: 16px;
    font-weight: bold;
    border-radius: 6px;
    text-decoration: none;
    transition: background 0.3s ease;
}


/* Biểu tượng Facebook */

.privacy-button i {
    margin-right: 8px;
}


/* Hiệu ứng hover */

.privacy-button:hover {
    background-color: #1F3565;
}