:root {
    --bg: #f5f5f5;
    --text: #2d3748;
    --heading: #111827;
    --link: #a89acd;
    --link-hover: #7c6da8;
    --link-visited: #5d5478;
    --meta: #9ca3af;
    --border: #d1d5db;
    --accent-mint: #d4f4dd;
    --accent-yellow: #fff9a6;
}

html.dark {
    --bg: #121212;
    --text: #e0e0e0;
    --heading: #f0f0f0;
    --link: #c9a0dc;
    --link-hover: #d4bfff;
    --link-visited: #b19cd9;
    --meta: #a0aec0;
    --border: #2d3748;
    --accent-mint: #a8dadc; 
    --accent-yellow: #f0e68c;
}

h1, h2, h3 {
    color: var(--heading);                
}

.meta, small, time, figcaption {
    color: var(--meta);                
    font-size: 0.9em;
    margin: 10px 0 30px;
}

.content {
    margin-bottom: 40px;
}

.content img {
    display: block;
    max-width: 100%;
    max-height: 300px;
    object-fit: contain;
}

.topbar-link {
    color: var(--heading);
    border-bottom: 1px solid var(--border);
    padding: 1px 10px;
}  

.back-link {
    display: inline-block;
    margin-top: 30px;
    padding: 10px 20px;
    color: var(--link);
    text-decoration: none;
    border-radius: 5px;
}

.back-link:hover, .back-link:focus {
    background: var(--link-hover);           
}

.category-tree {
    list-style: none;
    margin: 0;
    padding: 0;
}

.category-header {
    color: var(--heading);
    display: flex;
    align-items: center;
    gap: .35rem;
}

.category-header a {
    flex: 1;
    text-decoration: none;
    color: inherit;
}

.category-header:hover {
    background: rgba(255,255,255,.06);
    border-radius: 4px;
}

.category-item {
    margin: 0;
    padding: 0;
}

.toggle-btn {
    border: none;
    background: transparent;

    width: 1.2rem;
    height: 1.2rem;

    padding: 0;
    
    cursor: pointer;

    font-size: 0.75rem;

    color: var(--heading);
}

.toggle-btn:hover {
    background: rgba(255,255,255,.08);
    border-radius: 3px;
}

.feed-list {
    list-style: none;
    margin 0;
    padding-left: 1.6rem;
}

.entry-list {
    list-style: none;
    padding: 0;
    margin: 20px 0;
}

.entry-item {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--heading);
}

.entry-item img {
    display: none;
}

.entry-item:focus {
    outline: 2px solid var(--link);
    background: rgba(0, 100, 255, 0.05);
}

.entry-item h3 {
    margin: 0 0 8px;
}

.entry-item h3 a {
    color: var(--heading);
    text-decoration: none;
}

.entry-item h3 a:hover {
    text-decoration: underline;
}

.entry-item .meta {
    margin: 0 0 10px;
    font-size: 0.85em;
}

.hidden {
    display: none;
}

.sidebar-list {
    list-style-type: none;
}

.sidebar-list a {
    color: inherit;
}

a {
    color: var(--link);          
    text-decoration: none; 
}

a:hover, a:focus {
    color: var(--link-hover);
    text-decoration: underline;
}

a:visited {
    color: var(--link-visited);
}

#theme-toggle {
    background-color: #5A9DF0;
}

html.dark #theme-toggle {
    background-color: #20325A;
}

/* ====================== LAYOUT ====================== */

body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    transition: background-color 0.5s ease, color 0.5s ease;
}

.layout {
    display: flex;
    min-height: 100vh;
}

.topbar {
    background-color: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    padding: 12px 12px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.sidebar {
    width: 280px;
    background-color: var(--bg);
    border-right: 1px solid var(--bg);
    flex-shrink: 0;
    padding: 2rem 1.5rem;
}

.dark .sidebar {
    background-color: var(--bg);
    border-right-color: var(--bg);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Active link highlighting */
.sidebar nav a.active {
    background-color: #e0f2fe;
    color: #0369a1;
    font-weight: 600;
}

.dark .sidebar nav a.active {
    background-color: #1e40af;
    color: #bfdbfe;
}

.hero {
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    font-size: clamp(2rem, 8vw, 6rem)
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
}

.modal-content {
    position: relative;
    background: white;
    margin: 10% auto;
    padding: 25px;
    width: 90%;
    max-width: 480px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.dark .modal-content {
    background: #1f2937;
    color: #e0e0e0;
}