:root {
    --main-color: #2692ff;
    --secondary-color: #51a8ff;
    --third-color: #7dbeff;
    --fourth-color: #a8d3ff;
    --fifth-color: #d4e9ff;
    --sixth-color: #e9f4ff;
    --background-color: #f5f5f5;
}

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

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    word-break: keep-all;
    font-size: 16px;
    overflow-x: hidden;
    scroll-behavior: smooth;
    font-family: Pretendard, -apple-system, BlinkMacSystemFont, Bazier Square,
    Noto Sans KR, Segoe UI, Apple SD Gothic Neo, Roboto, Helvetica Neue, Arial,
    sans-serif, Apple Color Emoji, Segoe UI Emoji, Segoe UI Symbol,
    Noto Color Emoji;
}

@media screen and (max-width: 768px) {
    body {
        font-size: 14px;
    }
}

ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

li {
    margin: 0 10px;
}

a {
    text-decoration: none;
    color: inherit;
}

.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--main-color);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 1s ease-in-out, visibility 0.5s ease-in-out;
}

.nav.visible {
    opacity: 1;
    visibility: visible;
}

.nav ul {
    display: flex;
    justify-content: left;
    align-items: center;
    padding: 0 20px;
    margin: 0;
    list-style: none;
    background-color: var(--main-color);
    height: 50px;
    color: #fff;
}


.main--container {
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: var(--sixth-color);
}

.main--wrapper {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 70%;
    max-width: 1200px;
    max-height: 600px;
    height: 35%;
}

.site--link {
    position: relative;
}

.site--link.disabled {
    cursor: not-allowed;
}

.site--link::after {
    content: '사이트로 이동하기';
    position: absolute;
    left: 50%;
    top: 100%;
    transform: translateX(-50%);
    padding: 5px 60px;
    background-color: #333;
    color: #fff;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, visibility 0.2s;
    margin-top: 5px;
    border-radius: 3px;
    z-index: 1000;
}

.site--link.disabled::after {
    content: '현재 서버 작업 중으로 접속이 어려워요 😭';
}

.site--link:hover::after {
    opacity: 1;
    visibility: visible;
}

.site--link.disabled:hover::after {
    opacity: 1;
    visibility: visible;
}

.main--image {
    width: 100%;
    height: 100%;
    animation: fadeIn 1s ease-in-out;
    box-shadow: none;
}

@keyframes bounce {
    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-30px);
    }
    60% {
        transform: translateX(-50%) translateY(-15px);
    }
}

.fa-solid {
    position: absolute;
    top: 80%;
    left: 50%;
    transform: translateX(-50%);
    animation: fadeIn 1s ease-out, bounce 2s infinite 0.3s;
}

section {
    width: 100vw;
    height: 100vh;
    padding: 60px;
    gap: 60px;
}

section.about--section {
    display: flex;
    justify-content: space-around;
    align-items: center;
}

@media screen and (max-width: 768px) {
    section.about--section {
        flex-direction: column;
        justify-content: center;
    }

}

.about {
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

.about.visible {
    opacity: 1;
}

.about--description {
    padding: 0 40px;
}

@media screen and (max-width: 768px) {
    .about--description {
        padding: 0;
    }
}

.description-image {
    width: 50%;
}

@media screen and (max-width: 768px) {
    .description-image {
        width: 100%;
    }
}

h1 {
    font-size: 3rem;
    font-weight: 700;
    color: #4e5052;
}

@media screen and (max-width: 768px) {
    h1 {
        font-size: 2rem;
        color: #4e5052;
    }
}

h2 {
    font-size: 1.5rem;
    font-weight: 400;
    color: gray;
}

h3 {
    font-weight: 400;
    color: gray;
}

@media screen and (max-width: 768px) {
    h2 {
        font-size: 1.2rem;
        color: gray;
    }

    h3 {
        color: gray;
    }
}

.tech-stack-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 30px;
    width: 100%;
    height: 100%;
}

@media screen and (max-width: 768px) {
    .tech-stack-container {
        flex-direction: column;
    }
}

.tech-stack-contents {
    display: flex;
    flex-direction: column;
    border: 2px solid var(--main-color);
    border-radius: 12px;
    padding: 10px 24px;
    background: var(--sixth-color);
    width: 25%;
    max-width: 300px;
    height: 100%;
    max-height: 400px;
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
}

@media screen and (max-width: 768px) {
    .tech-stack-contents {
        width: 100%;
    }
}

section.tech-stack-section,
section.architecture-section,
section.team-section {
    display: flex;
    flex-direction: column;
}

section.tech-stack-section > h1,
section.architecture-section > h1,
section.team-section > h1 {
    margin-top: 0;
}

.tech-stack-contents > ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 10px;
}

.tech-stack-contents > li {
    margin-top: 10px;
}

.tech-stack-contents > h1 {
    text-align: center;
    margin-bottom: 20px;
    margin-top: 0px;
    font-size: 1.5rem;
}

section.architecture-section {
    width: 100%;
    height: 100%;
}

.architecture-image-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
}

.architecture-image {
    width: 80%;
    height: 80%;
}

img {
    box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2);
}

.team-section {
    height: auto;
}

.team-container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    gap: 10px;
    background-color: var(--sixth-color);
    max-width: 990px;
    margin: 0 auto;
}

.our-team {
    padding: 30px 0 40px;
    background-color: white;
    text-align: center;
    overflow: hidden;
    position: relative;
    width: 100%;
    margin: 0 auto;
}

.our-team .picture {
    display: inline-block;
    height: 130px;
    width: 130px;
    margin-bottom: 50px;
    z-index: 1;
    position: relative;
}

.our-team .picture::before {
    content: '';
    width: 100%;
    height: 0;
    border-radius: 50%;
    background-color: #1369ce;
    position: absolute;
    bottom: 135%;
    right: 0;
    left: 0;
    opacity: 0.9;
    transform: scale(3);
    transition: all 0.3s linear 0s;
}

.our-team:hover .picture::before {
    height: 100%;
}

.our-team .picture::after {
    content: '';
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #1369ce;
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
}

.our-team .picture img {
    width: 100%;
    height: auto;
    border-radius: 50%;
    transform: scale(1);
    transition: all 0.9s ease 0s;
}

.our-team:hover .picture img {
    box-shadow: 0 0 0 14px #f7f5ec;
    transform: scale(0.7);
}

.our-team .title {
    display: block;
    font-size: 15px;
    color: #4e5052;
    text-transform: capitalize;
}

.our-team .social {
    width: 100%;
    padding: 0;
    margin: 0;
    background-color: #1369ce;
    position: absolute;
    bottom: -100px;
    left: 0;
    transition: all 0.5s ease 0s;
}

.our-team:hover .social {
    bottom: 0;
}

.our-team .social li {
    display: inline-block;
}

.our-team .social li i {
    display: block;
    padding: 10px;
    font-size: 17px;
    color: white;
    transition: all 0.3s ease 0s;
    text-decoration: none;
    cursor: pointer;
}

.our-team .social li i:hover {
    color: #1369ce;
    background-color: #f7f5ec;
}

.poster {
    background-color: var(--sixth-color);
    width: 100%;

    height: 100%;
}

.presentation {
    width: 100%;
    height: 100%;
}

.nav ul li {
    margin: 0 1rem;
}

.nav ul li:hover {
    color: var(--fifth-color);
    transform: scale(1.1);
}


.nav-site-link {
    display: flex;
    position: absolute;
    right: 1rem;
    align-items: center;
}

.nav-site-link img {
    height: 35px;
    width: auto;
    cursor: pointer;
    background: none;
    border: none;
    box-shadow: none;
}
