/* ================ GOOGLE FONTS ============== */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@100..900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400..900;1,400..900&display=swap');

/* ================ VARIABLES CSS ============= */
:root {
    --header-height: 4rem;

    /* ========= COLORS ======= */
    --body-color: #fff;
    --black-color: #000;
    --section-color: #F8F9FA;
    --container-color: #f8fafc;
    --text-color: #a8a29e;
    --text-color-2: #64748B;
    --title-color: #0A192F;
    --footer-color: #1e293b;
    --button-color: #2563eb;
    --header-border-color: #e5e7eb;
    --bg-active-color: #eff6ff;
    --link-hover-color: #0D9488;
    --home-subtitle-color: #23c6b8;

    /* ========== FONT AND TYPOGRAPHY =========*/
    --body-font: "Outfit", sans-serif;
    --home-title-font: "Playfair Display", serif;
    --biggest-font-size: 2.5rem;
    --bigger-font-size: 1.75rem;
    --h1-font-size: 1.5rem;
    --h2-font-size: 1.25rem;
    --h3-font-size: 1rem;
    --normal-font-size: .938rem;
    --small-font-size: .813rem;
    --smaller-font-size: .75rem;

    /* ========== FONT WEIGHT =========*/
    --font-light: 300;
    --font-regular: 400;
    --font-medium: 500;
    --font-semi-bold: 600;
    --font-bold: 700;

    /* ========== Z INDEX =========*/
    --z-tooltip: 10;
    --z-fixed: 100;
}

/* ================ RESPONSIVER TYPOGRAPHY ================ */
@media screen and (min-width: 1150px) {
    :root {
        --biggest-font-size: 3.5rem;
        --bigger-font-size: 2.25rem;
        --h1-font-size: 1.75rem;
        --h2-font-size: 1.5rem;
        --h3-font-size: 1.25rem;
        --normal-font-size: 1rem;
        --small-font-size: .875rem;
        --smaller-font-size: .813rem;

        --header-height: 5.5rem
    }
}


/* ========== BASE ========= */
* {
    box-sizing: border-box;
    padding: 0;
    margin: 0;
}

html {
    scroll-behavior: smooth;
}

body,
button,
input {
    font-family: var(--body-font);
    font-size: var(--normal-font-size);
    color: var(--text-color);
}

body {
    background-color: var(--body-color);
}

button,
input {
    outline: none;
    border: none;
}

ul {
    list-style: none;
}

a {
    text-decoration: none;
}

img {
    width: 100%;
    height: 100%;
    object-position: center;
    object-fit: cover;
}

/* ========== REUSABLE CSS ========= */
.main {
    overflow: hidden;
}

.section {
    padding-block: 3rem 1rem;
}

.container {
    max-width: 1120px;
    margin-inline: 1.5rem;
}

.flex {
    display: flex;
    flex-direction: column;
}

.grid {
    display: grid;
    gap: 1.5rem;
}

.transition {
    transition: .5s;
}

/* ===== HEADER ===== */
.header {
    width: 100%;
    position: fixed;
    z-index: var(--z-fixed);
    top: 0;
    left: 0;
    background-color: var(--body-color);
    border-bottom: 1px solid var(--header-border-color);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.nav_logo {
    font-size: var(--h3-font-size);
    color: var(--title-color);
    font-weight: var(--font-bold);
    font-family: var(--home-title-font);
}

@media screen and (max-width:1150px) {
    .nav_menu {
        position: fixed;
        top: -100%;
        opacity: 0;
        left: 0;
        background-color: var(--body-color);
        width: 100%;
        padding: 2rem 4rem;
        border-bottom: 1px solid var(--header-border-color);
    }
}

.show-menu {
    top: 0;
    opacity: 1;
}

.nav_list {
    row-gap: .5rem;
}

.nav_list li {
    padding: 0.5rem;
    border-radius: 10px;
    transition: .5s;
}

.nav_list li:hover {
    background-color: var(--bg-active-color);
}

.nav_link {
    color: var(--footer-color);
    font-size: var(--h3-font-size);
    font-weight: var(--font-medium);
    transition: .5s;
}

.nav_list li:hover .nav_link {
    color: var(--link-hover-color);
}

.nav_link.active-link {
    color: #0f766e;
    background-color: var(--bg-active-color);
    padding: 0.5rem;
    border-radius: 10px;
}

.nav_close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
}

.nav_toggles {
    display: flex;
    align-items: center;
    column-gap: .5rem;
}

.lang_btn {
    color: var(--body-color);
    font-size: var(--h3-font-size);
    font-weight: var(--font-medium);
    padding: 0.5rem 1.5rem;
    background-color: var(--title-color);
    border-radius: 15px;
}

.lang_btn:hover {
    background-color: var(--button-color);
}

.nav_toggle,
.nav_close {
    font-size: var(--h1-font-size);
    color: var(--title-color);
    padding: 0.2rem 0.5rem;
    cursor: pointer;
    border-radius: 10px;
    width: max-content;
}

.nav_toggle:hover,
.nav_close:hover {
    background-color: var(--container-color);
}

/* ==== HOME ==== */
.home {
    background-image: url(images/home-bg_1.avif);
    background-position: right;
    background-repeat: no-repeat;
    background-size: cover;
    width: 100%;
    padding-top: 6rem;
    padding-bottom: 2rem;
    position: relative;
}

.home::after {
    position: absolute;
    content: "";
    top: 0;
    left: 0;
    background: linear-gradient(135deg, #0A192F 0%, #1e3a5f 100%);
    opacity: .8;
    width: 100%;
    height: 100%;
}

.home_container {
    position: relative;
    z-index: var(--z-tooltip);
    align-items: center;
    row-gap: 2rem;
}

.home_img {
    width: 200px;
    height: 200px;
    border: 5px solid var(--body-color);
    border-radius: 50%;
}

.home_img img {
    border-radius: 50%;
}

.home_content {
    row-gap: 1rem;
    align-items: center;
}

.home_info {
    align-items: center;
    text-align: center;
}

.home_info h1 {
    color: var(--body-color);
    font-size: var(--bigger-font-size);
    font-family: var(--home-title-font);
    font-weight: var(--font-bold);
}

.home_info h4 {
    color: var(--home-subtitle-color);
    font-size: var(--h3-font-size);
}

.home_info p {
    color: var(--container-color);
}

.home_cards {
    width: 100%;
    grid-template-columns: repeat(1, 1fr);
}

.home_data {
    padding: 2rem 1rem;
    align-items: center;
    text-align: center;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 1rem;
}

.home_data h2 {
    color: var(--body-color);
    font-size: var(--biggest-font-size);
    font-family: var(--home-title-font);
}

.home_data p {
    color: var(--bg-active-color);
}

.home_btns {
    margin-block: 1rem;
    display: flex;
    align-items: center;
    column-gap: 1rem;
}

.home_btn_1,
.home_btn_2 {
    padding: .8rem 2rem;
    transition: .5s;
    font-size: var(--h3-font-size);
    font-weight: var(--font-medium);
    border-radius: 1.5rem;
}

.home_btn_1 {
    background-color: var(--link-hover-color);
    color: var(--body-color);
}

.home_btn_1:hover {
    background: #0f766e;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(13, 148, 136, 0.3);
}

.home_btn_2 {
    color: var(--body-color);
    border: 2px solid var(--body-color);
}

.home_btn_2:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* ==== ABOUT ==== */
.about {
    padding-block: 4rem;
}

.about_info {
    row-gap: .5rem;
}

.about_info h1 {
    color: var(--title-color);
    font-family: var(--home-title-font);
    font-size: var(--bigger-font-size);
}

.about_info p {
    color: var(--text-color-2);
}

/* === CAREER ==== */
.career {
    background: var(--section-color);
    padding-block: 3rem;
}

.career_container {
    row-gap: 2rem;
}

.career_title {
    text-align: center;
}

.career_title h1 {
    font-size: var(--bigger-font-size);
    color: var(--title-color);
    font-family: var(--home-title-font);
}

.career_title p {
    color: var(--text-color-2);
}

.career_flex {
    align-items: center;
    justify-content: center;
}

.career_div_1,
.career_div_2 {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
}

.career_div_1 {
    border-left: 1px solid var(--header-border-color);
}

.career_div_2 {
    border-left: 1px solid var(--header-border-color);
}

.career_data {
    border-bottom: 1px solid var(--header-border-color);
}

.career_data {
    padding-block: 2rem;
    border-bottom: 1px solid var(--header-border-color);
}

.career_data_title {
    display: flex;
    align-items: center;
    position: relative;
}

.career_point {
    width: 10px;
    height: 10px;
    background-color: var(--black-color);
    border-radius: 50%;
    position: absolute;
    left: -0.3rem;
}

.career_point_1 {
    box-shadow: 0 10px 30px rgba(13, 148, 136, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 25px;
    height: 25px;
    background-color: var(--bg-active-color);
    border-radius: 50%;
    position: absolute;
    left: -0.7rem;
}

.career_point_2 {
    width: 15px;
    height: 15px;
    background-color: var(--link-hover-color);
    border-radius: 50%;
    border: 2px solid var(--body-color);
}

.career_data_title h3 {
    padding-left: 1rem;
    font-size: var(--normal-font-size);
    color: var(--home-subtitle-color);
    font-weight: var(--font-medium);
}

.career_data_info {
    padding-left: 1rem;
    padding-bottom: 1rem;
}

.career_data_info h1 {
    font-family: var(--home-title-font);
    color: var(--title-color);
    font-size: var(--h1-font-size);
}

.career_data_info p {
    color: var(--text-color-2);
    font-size: var(--h3-font-size);
    margin-block: .5rem;
}

.career_btn {
    width: max-content;
    color: var(--title-color);
    background-color: var(--header-border-color);
    padding: 0.3rem 1rem;
    border-radius: 1rem;
    font-size: var(--smaller-font-size);
    font-weight: var(--font-medium);
}

.career_btn-1 {
    width: max-content;
    background-color: var(--bg-active-color);
    color: var(--link-hover-color);
    padding: 0.3rem 1rem;
    border-radius: 1rem;
    font-size: var(--smaller-font-size);
    font-weight: var(--font-medium);
}

/* ====== LEADERSHIP ======= */
.leadership {
    padding-block: 3rem;
}

.leadership_container {
    align-items: center;
    row-gap: 2rem;
}

.leadership_title {
    text-align: center;
}

.leadership_title h1 {
    color: var(--title-color);
    font-family: var(--home-title-font);
    font-weight: var(--font-semi-bold);
    font-size: var(--biggest-font-size);
}

.leadership_title p {
    color: var(--text-color-2);
}

.leadership_grid {
    grid-template-columns: repeat(1, 1fr);
}

.leadership_data {
    padding: 2rem;
    border-radius: 10px;
    border: 1px solid var(--header-border-color);
    transition: .5s;
}

.leadership_data:hover {
    border-color: var(--link-hover-color);
    box-shadow: rgba(0, 0, 0, 0.35) 0px 5px 15px;
    cursor: pointer;
}

.leadership_data h4 {
    color: var(--home-subtitle-color);
    font-weight: var(--font-medium);
}

.leadership_data h1 {
    color: var(--title-color);
    font-family: var(--home-title-font);
    font-size: var(--bigger-font-size);
}

.leadership_data h5 {
    font-size: var(--h3-font-size);
    color: var(--text-color-2);
    font-weight: var(--font-medium);
}

.research {
    padding-block: 3rem;
    background-color: var(--section-color);
}

.research_container {
    align-items: center;
    row-gap: 2rem;
}

.research_title {
    text-align: center;
}

.research_title h1 {
    color: var(--title-color);
    font-family: var(--home-title-font);
    font-size: var(--biggest-font-size);
}

.research_title p {
    color: var(--text-color-2);
}

.research_grid,
.publications_grid {
    width: 100%;
    grid-template-columns: repeat(1, 1fr);
}

.research_data {
    transition: .5s;
    padding: 2rem;
    border: 1px solid var(--header-border-color);
    background-color: var(--body-color);
    border-radius: 10px;
}

.research_data:hover {
    border-color: var(--link-hover-color);
    box-shadow: rgba(0, 0, 0, 0.35) 0px 5px 15px;
    cursor: pointer;
}

.research_data i {
    font-size: var(--biggest-font-size);
    color: var(--title-color);
}

.research_data h2 {
    color: var(--title-color);
    font-family: var(--home-title-font);
    font-size: var(--h2-font-size);
    margin-block: 1rem;
}

.research_list {
    color: var(--text-color-2);
}

.research_list li {
    padding-block: 0.5rem;
    border-bottom: 1px solid var(--header-border-color);
}

/* ====== PUBLICATIONS ======= */
.publications {
    padding-block: 3rem;
}

.publications_container {
    row-gap: 1.5rem;
}

.publication_data {
    padding: 2rem;
    background-color: var(--section-color);
    border-radius: 10px;
    text-align: center;
    cursor: pointer;
    transition: .5s;
}

.publication_data:hover {
    background-color: var(--title-color);
}

.publication_data:hover h1 {
    color: var(--body-color);
}

.publication_data h1 {
    color: var(--link-hover-color);
    font-family: var(--home-title-font);
    font-size: var(--biggest-font-size);
}

.publication_data p {
    color: var(--text-color-2);
}

.publication_banner {
    margin-block: 2rem;
    padding: 2rem 4rem;
    border: 1px solid var(--header-border-color);
    border-radius: 10px;
}

.publication_banner h1 {
    color: var(--title-color);
    font-family: var(--home-title-font);
    font-size: var(--bigger-font-size);
    margin-bottom: 0.5rem;
}

.publication_banner_list {
    display: flex;
    flex-direction: column;
    row-gap: .5rem;
}

.publication_banner_list li {
    padding-block: .5rem;
    display: flex;
    align-items: center;
    column-gap: .5rem;
    border-bottom: 1px solid var(--header-border-color);
    color: var(--text-color-2);
}

.publication_banner_list li i {
    color: var(--link-hover-color);
}

/* ======= international ======== */
.international {
    background-color: var(--section-color);
    padding-block: 3rem;
}

.international_container {
    row-gap: 2rem;
}

.international_div {
    row-gap: 1rem;
}

.international_div h1 {
    font-family: var(--home-title-font);
    color: var(--title-color);
    font-size: var(--bigger-font-size);
}

.international_grid {
    grid-template-columns: repeat(1, 1fr);
}

.international_data {
    padding: 1rem;
    background-color: var(--body-color);
    border: 1px solid var(--header-border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: .5s;
}

.international_data:hover {
    border-color: var(--link-hover-color);
    transform: translateY(-.25rem);
}

.international_data h3 {
    color: var(--title-color);
}

/* ========= CONTACT ======== */
.contact {
    padding-block: 3rem;
    background-color: var(--footer-color);
}

.contact_container {
    row-gap: 2rem;
}

.contact_title {
    text-align: center;
    color: var(--body-color);
}

.contact_title h1 {
    font-family: var(--home-title-font);
    font-size: var(--biggest-font-size);
}

.contact_title p {
    color: var(--container-color);
}

.contact_div {
    row-gap: 2rem;
}

.contact_form {
    row-gap: 1rem;
    align-items: self-start;
}

.contact_form textarea {
    outline: none;
    border: none;

}

.contact_form textarea::placeholder {
    font-family: var(--body-font);
    font-size: var(--normal-font-size);
}

.contact_form input,
.contact_form textarea {
    padding: 1rem .5rem;
    background: rgba(255, 255, 255, 0.1);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 10px;
    width: 100%;
}

.contact_form input:focus,
.contact_form textarea:focus,
.contact_form input:valid,
.contact_form textarea:valid {
    color: var(--body-color);
}

.contact_btn {
    padding: .5rem 1rem;
    background-color: #35d4c7;
    color: var(--body-color);
    border-radius: 10px;
    font-size: var(--h3-font-size);
    cursor: pointer;
    transition: .5s;
}

.error-message {
    color: rgb(255, 1, 1);
    font-size: var(--small-font-size);
    font-weight: var(--font-medium);
}

.contact-message {
    color: rgb(1, 255, 1);
    font-size: var(--small-font-size);
    font-weight: var(--font-medium);
}

.contact_btn:hover {
    transform: translateY(-.25rem);
    box-shadow: rgba(124, 242, 255, 0.24) 0px 3px 8px;
}

.contact_boxs {
    grid-template-columns: repeat(1, 1fr);
}

.contact_box {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0.75rem;
    padding: 1.5rem;
}

.contact_box h3 {
    font-weight: var(--font-medium);
    color: var(--text-color);
    font-size: var(--h2-font-size);
}

.contact_box h4 {
    color: var(--body-color);
}

.contact_copy {
    padding-top: 2rem;
    width: 100%;
}

.contact_copy_div {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--smaller-font-size);
    column-gap: 5rem;
    padding-top: 1rem;
}

.author {
    text-align: end;
}

.author a {
    color: var(--container-color);
}

/* ========== ALBUM HTML ======== */
.album {
    padding-top: 4rem;
    padding-bottom: 4rem;
}

.album_title {
    width: 100%;
    padding: 2rem;
    text-align: center;
    background-image: url(images/album-bg.jpg);
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
}

.album_title::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--title-color);
    opacity: .7;
}

.album_title h1,
.album_title p {
    position: relative;
    z-index: var(--z-tooltip);
}

.album_title h1 {
    color: var(--body-color);
    text-transform: uppercase;
    font-size: var(--bigger-font-size);
    font-family: var(--home-title-font);
}

.album_title p {
    color: var(--container-color);
    font-size: var(--small-font-size);
}

.album_container {
    padding-top: 3rem;
}

.album_div {
    grid-template-columns: repeat(1, 1fr);
}

.album_data {
    padding: 1rem;
    border: 1px solid var(--header-border-color);
}

.book {
    padding-block: 3rem;
}

.book_container {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    row-gap: 2rem;
}

.book_img {
    width: 100%;
    height: 500px;
}

.book_info {
    row-gap: 1rem;
    align-items: self-start;
}

.book_title {
    font-family: var(--home-title-font);
    color: var(--title-color);
}

@media screen and (min-width:1150px) {

    .container {
        max-width: 1736px;
        margin-inline: 4rem;
    }

    .nav_list {
        flex-direction: row;
        column-gap: 1.5rem;
    }

    .nav_link {
        font-size: var(--normal-font-size);
    }

    .nav_close,
    .nav_toggle {
        display: none;
    }

    .home_container {
        flex-direction: row;
        justify-content: space-evenly;
        align-items: center;
        padding-block: 4rem;
    }

    .home_img {
        width: 300px;
        height: 300px;
    }

    .home_content {
        align-items: self-start;
    }

    .home_info {
        text-align: start;
        align-items: self-start;
    }

    .home_info h1 {
        font-size: var(--biggest-font-size);
    }

    .home_cards {
        grid-template-columns: repeat(4, 1fr);
        margin-block: 1rem;
    }

    .home_data h2 {
        font-size: var(--bigger-font-size);
    }

    .about_info h1 {
        font-size: var(--biggest-font-size);
    }

    .about_info p {
        padding-left: 10rem;
        font-size: var(--normal-font-size);
    }

    .career_title h1 {
        font-size: var(--biggest-font-size);
    }

    .career_flex {
        flex-direction: row;
        column-gap: 5rem;
    }

    .career_data_info p {
        font-size: var(--normal-font-size);
    }

    .leadership_grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .leadership_data h1 {
        font-size: var(--h1-font-size);
    }

    .research_grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .publications_grid {
        grid-template-columns: repeat(5, 1fr);
    }

    .publication_data h1 {
        font-size: var(--bigger-font-size);
    }

    .international_grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .international_title {
        max-width: 800px;
        margin-inline: auto;
    }

    .contact_div {
        flex-direction: row;
        justify-content: space-around;
        margin-top: 2rem;
    }

    .contact_div_1 {
        width: 50%;
    }

    .contact_div_2 {
        width: 30%;
    }

    .album_title {
        padding-block: 4rem;
    }

    .album_div {
        grid-template-columns: repeat(4, 1fr);
    }

    .book_container {
        grid-template-columns: repeat(2, 1fr);
        column-gap: 3rem;
    }
}

@media screen and (min-width:1919px) {
    .container {
        max-width: 2400px;
        margin-inline: 8rem;
    }
}