body {
    margin: 0;
    background: #f1f3f4;
    font-family: "Arial", sans-serif;
    overflow-y: auto;
    color: #202124;
}
.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: white;
    padding: 10px 16px;
    border-bottom: 1px solid #dadce0;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.toolbar-left {
    display: flex;
    align-items: center;
    gap: 16px;
}
.doc-title {
    font-size: 1.2em;
    font-weight: bold;
}
.menu {
    display: flex;
    gap: 14px;
    font-size: 0.95em;
    color: #5f6368;
    cursor: default;
}
.toolbar-right {
    font-size: 0.85em;
    color: #5f6368;
}
.doc-container {
    max-width: 800px;
    margin: 40px auto;
    background: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    padding: 60px 80px;
    border-radius: 8px;
}
.doc-container img {
    display: block;
    margin: 0 auto 20px;
    max-width: 100%;
    height: auto;
}
.doc-container h1 {
    text-align: center;
    font-size: 2.4em;
    margin-bottom: 0.2em;
}
.doc-container h2 {
    text-align: center;
    font-weight: normal;
    color: #5f6368;
    margin-bottom: 1em;
}
.doc-container p {
    font-size: 1.05em;
    line-height: 1.8;
    margin-bottom: 1.6em;
}
.doc-container a {
    color: #1a73e8;
    text-decoration: none;
}
.doc-container a:hover {
    text-decoration: underline;
}
.image-row {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin: 30px 0;
    flex-wrap: wrap;
}
.image-row .enlarge-image {
    text-align: center;
    font-size: 0.95em;
    color: #5f6368;
}
.image-row .enlarge-image img {
    width: 100%;
    max-width: 360px;
    height: auto;
    margin-top: 10px;
}
ul {
    margin-left: 1.5em;
    font-size: 1.05em;
    line-height: 1.6;
}
footer {
    text-align: center;
    margin-top: 60px;
    font-size: 0.9em;
    color: #888;
}
.back-to-top {
    display: block;
    position: fixed;
    bottom: 20px;
    right: 30px;
    z-index: 99;
    border: none;
    outline: none;
    background-color: #5f6368;
    color: white;
    cursor: pointer;
    padding: 10px 15px;
    border-radius: 5px;
    font-size: 1em;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    transition: background-color 0.3s ease;
}
.back-to-top:hover {
    background-color: #202124;
}
.slideshow-container {
    max-width: 100%;
    position: relative;
    margin: auto;
}
.mySlides {
    display: none;
    text-align: center;
}
.mySlides img {
    max-width: 100%;
}
.prev, .next {
    cursor: pointer;
    position: absolute;
    top: 50%;
    width: auto;
    padding: 16px;
    margin-top: -22px;
    color: white;
    font-weight: bold;
    font-size: 18px;
    transition: 0.6s ease;
    border-radius: 0 3px 3px 0;
    user-select: none;
    background-color: rgba(0,0,0,0.5);
}
.next {
    right: 0;
    border-radius: 3px 0 0 3px;
}
.prev:hover, .next:hover {
    background-color: rgba(0,0,0,0.8);
}
.text {
    color: #202124;
    font-size: 15px;
    padding: 8px 12px;
    bottom: 8px;
    width: 100%;
    text-align: center;
}
.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    z-index: 2000;
    display: none;
}
.popup-content {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: white;
    padding: 30px;
    border: 1px solid #ccc;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    text-align: center;
    z-index: 2001;
    max-width: 650px;
    display: none;
}
.popup-content img {
    width: 100%;
    height: auto;
    max-width: 500px;
    margin-bottom: 20px;
}
.popup-buttons button {
    padding: 10px 20px;
    margin: 0 10px;
    cursor: pointer;
}