@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: 0;
  padding: 0;
}

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

#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;
}

#contents {
    font-family: "Raleway", sans-serif;
    font-size: var(--font-size-body);
    padding: 160px 58px 50px 58px;
    margin: 0px;
}

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

.tab-buttons {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
}

.tab-button {
  background: none;
  border: none;
  font-family: "Raleway", sans-serif;
  font-size: var(--font-size-body);
  font-weight: 300;
  cursor: pointer;
  padding: 5px 10px;
}

.tab-button.active {
  font-weight: 300;
  border-bottom: 2px solid var(--color-blue);
}

.tab-content {
  display: none;
}

.tab-content.active {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: var(--font-size-body);
}

#preview-view.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

#preview-view embed {
    display: block;
    max-width: 100%;
}

/* Tablet (768px and below) */
@media (max-width: 768px) {
    #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-bottom: 24px;
    }

    .tab-buttons {
        gap: 16px;
        margin-bottom: 16px;
        flex-wrap: wrap;
    }

    .tab-button {
        font-size: var(--font-size-body);
        padding: 6px 10px;
    }

    .tab-content {
        font-size: var(--font-size-body);
    }

    #preview-view,
    #preview-view embed {
        width: 100%;
    }

    #preview-view embed {
        height: 75vh;
        min-height: 520px;
    }
}

/* 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-bottom: 18px;
    }

    .tab-buttons {
        gap: 12px;
        margin-bottom: 12px;
        flex-direction: column;
    }

    .tab-button {
        font-size: var(--font-size-body);
        padding: 8px 12px;
        text-align: left;
        width: 100%;
    }

    .tab-button.active {
        border-bottom: 2px solid var(--color-blue);
    }

    .tab-content {
        font-size: var(--font-size-body);
        flex-direction: column;
    }

    #preview-view.active {
        flex-direction: column;
        align-items: flex-start;
    }

    #preview-view embed {
        height: 68vh;
        min-height: 440px;
    }
}