@import url('https://fonts.googleapis.com/css2?family=Raleway:ital,wght@0,100..900;1,100..900&display=swap');

:root {
    --color-navbar: #141d28;
    --color-white: #ffffff;
    --color-blue: #0073ff;
}

* {
    margin: 0px;
    padding: 0px;
}

@font-face {
    font-family: 'Raleway', sans-serif;
    src: url('https://fonts.googleapis.com/css2?family=Raleway:wght@200;400;500&display=swap');
}

#contents {
    padding: 160px 58px 50px 58px;
    font-size: var(--font-size-body);
}

#contents .title {
    margin: 0px 0px 32px 0px;
    font-size: var(--font-size-page-title);
    font-family: "Raleway", sans-serif;
    font-weight: 500;
}

#contents .research-info {
    max-width: 100%;
}

#contents .research-section {
    margin-bottom: 44px;
}

#contents .research-section h1 {
    font-family: "Raleway", sans-serif;
    font-size: var(--font-size-section-title);
    font-weight: 500;
    margin-bottom: 16px;
}

#contents .research-project {
    margin-top: 24px;
}

#contents .research-project h2 {
    font-family: "Raleway", sans-serif;
    font-size: var(--font-size-body);
    font-weight: 500;
    line-height: 1.35;
    margin-bottom: 4px;
}

#contents .research-project .research-role {
    font-weight: 400;
}

#contents .research-project-body {
    display: grid;
    grid-template-columns: minmax(0, 1fr) min(40%, 420px);
    gap: 32px;
    align-items: center;
}

#contents .research-project-copy {
    min-width: 0;
}

#contents .research-figure {
    width: 100%;
    max-width: 420px;
    margin: 0;
    justify-self: end;
}

#contents .research-figure a,
#contents .research-figure img {
    display: block;
    width: 100%;
}

#contents .research-figure img {
    height: auto;
}

#contents .research-project ul {
    padding-left: 1.1em;
}

#contents .research-section .research-project ul li {
    list-style: disc;
    margin-top: 10px;
}

#contents .research-section .research-project ul li p {
    padding: 0;
}

#contents .publication-venue {
    font-style: italic;
}

/* Tablet (768px and below) */
@media (max-width: 768px) {
    #contents .research-project-body {
        display: block;
    }

    #contents .research-figure {
        max-width: 320px;
        margin: 20px auto 0;
    }

    #navbar {
        padding: 0 24px;
        height: 70px;
    }

    #navbar .logo {
        font-size: 18px;
    }

    #navbar ul li {
        width: auto;
        padding: 8px 16px;
    }

    #navbar ul li a {
        font-size: 16px;
    }

    #contents {
        padding: 100px 24px 40px 24px;
        font-size: var(--font-size-body);
    }

    #contents .title {
        font-size: var(--font-size-page-title);
        margin: 0px 0px 24px 0px;
    }

    #contents .research-info {
        max-width: 100%;
    }

    #contents .research-section {
        margin-bottom: 32px;
    }

    #contents .research-section h1 {
        font-size: var(--font-size-section-title);
        margin-bottom: 12px;
    }

    #contents .research-project {
        margin-top: 20px;
    }

    #contents .research-section p {
        padding: 6px 0;
        font-size: var(--font-size-body);
        line-height: 1.4;
    }

    #contents .research-section ul li {
        margin-top: 16px;
    }
}

/* Mobile (480px and below) */
@media (max-width: 480px) {
    #navbar {
        padding: 0 16px;
        height: 65px;
    }

    #navbar .logo {
        font-size: 16px;
    }

    #navbar ul {
        flex-direction: column;
        align-items: flex-end;
        gap: 4px;
    }

    #navbar ul li {
        padding: 6px 12px;
        width: auto;
    }

    #navbar ul li a {
        font-size: 14px;
    }

    #navbar ul li:hover .dropdown-1 li {
        margin: 10px;
    }

    #navbar ul li:hover .dropdown-2 li {
        margin: 8px;
    }

    #contents {
        padding: 85px 16px 30px 16px;
        font-size: var(--font-size-body);
    }

    #contents .title {
        font-size: var(--font-size-page-title);
        margin: 0px 0px 18px 0px;
    }

    #contents .research-info {
        max-width: 100%;
    }

    #contents .research-section {
        margin-bottom: 24px;
    }

    #contents .research-section h1 {
        font-size: var(--font-size-section-title);
        margin-bottom: 10px;
    }

    #contents .research-project {
        margin-top: 16px;
    }

    #contents .research-section p {
        padding: 5px 0;
        font-size: var(--font-size-body);
        line-height: 1.35;
    }

    #contents .research-section ul li {
        margin-top: 12px;
    }
}

#contents .research-section p {
    padding: 7px 0;
    font-family: 'Raleway', sans-serif;
    font-size: var(--font-size-body);
    font-weight: 300;
    line-height: 1.5;
}

#contents .research-section ul li {
    margin-top: 20px;
    list-style: none;
}

#navbar {
    background-color: var(--color-navbar);
    height: 80px;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 58px;
    box-sizing: border-box;
    top: 0;
    position: fixed;
    z-index: 9999;
}

#navbar .logo {
    display: flex;
    align-items: center;
    color: var(--color-white);
    font-family: 'Raleway', sans-serif;
    font-size: 20px;
    font-weight: 400;
    cursor: pointer;
    transition: all 0.3s ease;
}

#navbar .logo:hover {
    color: var(--color-blue);
}

#navbar ul {
    list-style: none;
    display: flex;
    justify-content: center;
    padding: 0px;
}

#navbar ul li {
    list-style: none;
    width: 120px;
    padding: 10px 30px;
    text-align: center;
    position: relative;

}

#navbar ul li a {
    color: var(--color-white);
    text-decoration: none;
    font-family: 'Raleway', sans-serif;
    font-size: 20px;
    transition: all 0.3s;
}

#navbar ul li a:hover{
    color: var(--color-blue);
}

.dropdown-1 {
    display: none;
    opacity: 0;
    transition: fadeIn 2s ease-in-out;
}

@keyframes fadeIn{
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

/* 目前来说做不到fadeout 因为这个的实现必须是在display非none的情况下 
也就是说要使用visibility: hidden 但是没有办法把二级菜单分开 所以
使用hidden会导致整个一级菜单栏被挤到上面去

md我已经尽力了 */

/* @keyframes fadeOut{
    from {
        opacity: 1;
    }

    to {
        opacity: 0;
    }
} */

#navbar ul li:hover .dropdown-1 {
    display: block;
    position: absolute;
    left: 0;
    top: 100%;
    background-color: var(--color-navbar);
    animation: fadeIn 0.3s forwards;

}

/* #navbar ul li:not(:hover) .dropdown-1 {
    animation: fadeOut 0.3s forwards;
    animation-delay: 0.5s;
} */

#navbar ul li:hover .dropdown-1 li {
    margin: 15px;
}

.dropdown-2 {
    display: none;
    opacity: 0;
    transition: fadeIn 2s ease-in-out;
}

#navbar ul li:hover .dropdown-2 {
    display: block;
    position: absolute;
    left: 0;
    top: 100%;
    background-color: var(--color-navbar);
    animation: fadeIn 0.3s forwards;
}

#navbar ul li:hover .dropdown-2 li {
    margin: 10px;
}

/* Keep responsive text rules after the desktop declarations above. */
@media (max-width: 768px) {
    #contents .research-section p {
        padding: 6px 0;
        font-size: var(--font-size-body);
        line-height: 1.5;
    }

    #contents .research-section ul li {
        margin-top: 16px;
    }
}

@media (max-width: 480px) {
    #contents .research-section p {
        padding: 5px 0;
        font-size: var(--font-size-body);
        line-height: 1.5;
        overflow-wrap: anywhere;
    }

    #contents .research-section ul li {
        margin-top: 12px;
    }
}