:root {
    --container-max-width: 2000px;
    --sidebar-width: 350px;
    --main-content-max-width: 75ch;
    --background-color: #fdfdfd;
    --theme-color: rgb(140, 72, 229);
    --theme-color-dark: #33c;
    --theme-color-light: rgb(241, 246, 255);
    --theme-color-highlights: #333;
    --text-color: #000;
    --serif-font: Georgia, serif;
    --sans-serif-font: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --gap-sm: 0.5rem;
    --gap-md: 1rem;
    --gap-lg: 2rem;
}

body, html {
    position: relative;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    max-width: 100%;
    font-family: var(--serif-font);
    font-size: 16px;
    line-height: 1.7rem;
    color: var(--text-color);
    background-color: var(--background-color);
}

p {
    margin-top: 0;
    margin-bottom: var(--gap-sm);
}

header {
    padding: var(--gap-md);
    border-bottom: 1px solid var(--border-color);
}

.container {
    display: flex;
    flex-direction: row;
    max-width: var(--container-max-width);
    justify-content: center;
    margin: 0 auto;
    padding: 0;
    box-sizing: border-box;
    padding-right: var(--sidebar-width);
}

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

.left {
    background-color: var(--background-color);
    width: var(--sidebar-width);
}

.right {
  width: 0px;
}

.content {
    width: 100%;
    padding-bottom: var(--gap-lg);
}

.sticky-div {
    position: sticky;
    top: 40px;
    padding: 20px;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
}

/* Webkit browsers like Chrome, Safari */
.sticky-div::-webkit-scrollbar {
    width: 2px;
}

.sticky-div::-webkit-scrollbar-track {
    background: #fff;
}

.sticky-div::-webkit-scrollbar-thumb {
    border-radius: 2px;
}


.main {
    max-width: var(--main-content-max-width);
    padding-left: var(--gap-lg);
    padding-right: var(--gap-lg);
    box-sizing: border-box;
    background-color: var(--background-color);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* Add this new rule */
img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: var(--gap-md) auto;
}

.collapsed-sidebar {
    display: none;
    background-color: var(--background-color);
    padding: 10px 20px;
}

@media (max-width: 1450px) {
    .container {
        flex-direction: column;
        transform: none;
        padding-right: 0;
    }
    .left, .right {
        display: none;
    }
    .collapsed-sidebar {
        display: block;
    }
    .main {
        padding-left: var(--gap-md);
        padding-right: var(--gap-md);
        max-width: min(100%, var(--main-content-max-width));
        margin: 0 auto; 
    }
    .post-content {
        border-top: 0px !important;
    }
}

header nav {
    max-width: var(--container-max-width);
    margin: 0 auto;
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

header nav ul {
    list-style-type: none;
}

header nav ul li {
    margin-left: var(--gap-md);
}

a,
a:active {
    color: #0000EE;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}

/* Hover effect (optional) */
header nav ul li a:hover {
    text-decoration: underline;
}

hr.toc-separator {
    border-top: 1px solid var(--theme-color-highlights);
    margin: 0;
}

.table-of-contents {
    font-family: var(--sans-serif-font);
}

.table-of-contents ul {
    list-style-type: none;
    margin: 0;
    padding: var(--gap-md) 0;
    display: flex;
    flex-direction: column;
    gap: var(--gap-sm);
}

.table-of-contents li {
    line-height: 1.3;
    margin-bottom: 0;
}

.toc-heading {
    font-style: italic;
    font-family: var(--sans-serif-font);
}

.collapsed-sidebar {
    border-bottom: 1px solid var(--border-color);
}

.table-of-contents .toc-h2 { padding-left: 1rem; }
.table-of-contents .toc-h3 { padding-left: 2rem; }
.table-of-contents .toc-h4 { padding-left: 3rem; }
.table-of-contents .toc-h5 { padding-left: 4rem; }
.table-of-contents .toc-h6 { padding-left: 5rem; }

.table-of-contents a {
    text-decoration: none;
    color: var(--theme-color-highlights);
}

.table-of-contents a:hover {
    text-decoration: underline;
}

.site-name {
    font-size: var(--gap-md);
    text-align: right;
    color: #555;
}

.site-name a:hover {
    text-decoration: underline;
}

.post-title {
    text-align: center;
    font-family: var(--sans-serif-font);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--sans-serif-font);
    font-weight: bold;
    line-height: 1.4em;
    letter-spacing: .01em;
}

h1 { font-size: 1.5rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1rem; }

.heading-font {
    font-family: var(--sans-serif-font);
}


.post-meta {
    color: #666;
    margin-top: 0;
    margin-bottom: var(--gap-lg);
    text-align: center;
    font-family: var(--sans-serif-font);
    font-size: var(--gap-md);
    font-style: italic;
}


.post-summary {
    text-align: left;
    margin: var(--gap-lg) 0;
}

.post-content {
    padding: var(--gap-lg) 0;
    border-top: 1px solid var(--theme-color-highlights);
    border-bottom: 1px solid var(--theme-color-highlights);
}


.footer {
    text-align: left;
    font-size: var(--gap-md);
    padding: var(--gap-md) 0;
}



/* Tab styles */
.tab-container {
    width: 100%;
    margin-top: var(--gap-lg);
}

.tab-container input[type="radio"] {
    display: none;
}

.tab-buttons {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--gap-md);
}

.tab-button {
    flex: 1;
    padding: 10px;
    cursor: pointer;
    font-family: var(--sans-serif-font);
    text-align: center;
    border: 1px solid #ccc;
    letter-spacing: .01em;
}

.tab-button:hover {
    background-color: var(--theme-color-light);
    border-color: var(--theme-color-highlights);
    color: var(--theme-color-highlights);
}

.tab-content {
    display: none;
}

/* Show active tab content */
#tab1:checked ~ #chronological,
#tab2:checked ~ #type,
#tab3:checked ~ #topic {
    display: block;
}

/* Style for active tab button */
#tab1:checked ~ .tab-buttons label[for="tab1"],
#tab2:checked ~ .tab-buttons label[for="tab2"],
#tab3:checked ~ .tab-buttons label[for="tab3"] {
    border: 2px solid var(--theme-color-highlights);
    color: var(--theme-color-highlights);
    font-weight: bold;
}

.link-heading{
    font-style: italic;
    font-family: var(--sans-serif-font);
}

/* Responsive adjustments */
@media (max-width: 600px) {
    .tab-buttons {
        flex-direction: column;
    }

    .tab-button {
        margin-bottom: 5px;
    }
}

/* make quotes italicised */
blockquote {
    font-style: italic;
    color: #333;
    border-left: 1px solid var(--theme-color-highlights);
    margin: var(--gap-md) 0;
    padding-left: var(--gap-md);
}

code {
    font-size: 0.9em;
    white-space: pre-wrap !important;
    word-wrap: break-word !important;
}

/* shade the background of code grey */
pre {
    background-color: #f5f5f5 !important; /* Light grey */
}


/* reduce margin before unordered list */
ul {
    margin-top: 0em;
}

/* Footnote styling */

sup[id^="fnref:"] {
    margin: 0;
    padding: 0;
    line-height: 1.7;
    vertical-align: super;
    font-size: 0.8em;
    position: relative;
    text-decoration: none;
    color: var(--theme-color);
}

/* Hide CSS pseudo-element tooltips since JS-driven tooltips will be used */
.footnote-ref::after, .footnote-ref::before {
    display: none !important;
}

/* Styles for the interactive footnote tooltip */
.footnote-tooltip {
    position: absolute;
    display: none;
    background: var(--background-color);
    border: 1px solid var(--theme-color-highlights);
    padding: 0.5rem;
    border-radius: 4px;
    max-width: 600px;
    min-width: 350px;
    font-size: 0.9em;
    color: var(--text-color);
    z-index: 1000;
    white-space: normal;
    word-wrap: break-word;
}

/* Links inside the tooltip */
.footnote-tooltip a {
    color: var(--theme-color);
    text-decoration: none;
}
.footnote-tooltip a:hover {
    color: var(--theme-color-highlights);
    text-decoration: underline;
}

/* Photo gallery styles */
.photo-gallery {
    margin-top: 2rem;
    margin-bottom: 2rem;
    width: 100%;
    max-width: 1200px;
}

.photo-group {
    margin-bottom: 1.5rem;
    border: 1px solid #ddd;
    border-radius: 6px;
    overflow: hidden;
    box-sizing: border-box;
}

.photo-group summary {
    cursor: pointer;
    padding: 1rem 1.5rem;
    background-color: #fafafa;
    font-weight: 600;
    font-size: 1rem;
    user-select: none;
    transition: background-color 0.15s ease;
    list-style: none;
    display: block;
    box-sizing: border-box;
}

.photo-group summary::-webkit-details-marker {
    display: none;
}

.photo-group summary::before {
    content: '▶';
    display: inline-block;
    margin-right: 0.5rem;
    transition: transform 0.2s ease;
    font-size: 0.8rem;
}

.photo-group[open] summary::before {
    transform: rotate(90deg);
}

.photo-group summary:hover {
    background-color: #f0f0f0;
}

.photo-count {
    font-weight: normal;
    font-size: 0.9rem;
    color: #666;
    margin-left: 0.5rem;
}

.photo-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    padding: 1.5rem;
    box-sizing: border-box;
    background-color: #fff;
}

.photo-grid a {
    display: block;
    overflow: hidden;
    border-radius: 4px;
    line-height: 0;
    box-sizing: border-box;
}

.photo-grid a:hover {
    opacity: 0.95;
}

.photo-grid img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    display: block;
    box-sizing: border-box;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .photo-gallery {
        width: 100%;
    }

    .photo-group summary {
        padding: 0.875rem 1rem;
        font-size: 0.95rem;
    }

    .photo-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
        padding: 1rem;
    }

    .photo-grid img {
        height: 300px;
    }
}