:root {
    /* Default Dark Theme */
    --bg-color: #1a202c;
    --sidebar-bg: #2d3748;
    --text-color: #e2e8f0;
    --text-muted: #a0aec0;
    --accent-color: #63b3ed;
    --card-bg: #2d3748;
    --card-hover: #4a5568;
    --font-main: 'Inter', sans-serif;
    --font-heading: 'Libre Baskerville', serif;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.3), 0 2px 4px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.3), 0 4px 6px -2px rgba(0,0,0,0.1);
    --border-color: #4a5568;
    
    /* Navigation & Links (Dark) */
    --nav-active-bg: #2c5282;
    --link-hover-color: #2c5282;
    
    /* Repo Tag Colors (Dark) */
    --repo-tag-public-rgb: 104, 211, 145;
    --repo-tag-private-rgb: 252, 129, 129;
    --repo-stats-bg: #4a5568;
    
    /* Carousel (Dark) */
    --carousel-btn-bg: rgba(45, 55, 72, 0.8);
    --carousel-btn-hover-bg: #4a5568;
    
    /* Journal Title (Dark) */
    --journal-title-color: #ffffff;

    /* Tag Colors (Dark) */
    --tag-structural: #d6bcfa;
    --tag-surveys: #81e6d9;
    --tag-rct: #68d391;
    --tag-quasi: #f6ad55;
    --tag-market-design: #63b3ed;
    --tag-policy: #fc8181;
    --tag-data: #f6e05e;
    --tag-ai: #f687b3;
    --tag-education: #4fd1c5;
    --tag-health: #f687b3;
    --tag-labor: #f6ad55;
    --tag-theory: #9f7aea;
    --tag-info: #63b3ed;
    --tag-evolution: #68d391;
    --tag-implementation: #a0aec0;
    
    /* Paper Link Color (Dark) */
    --paper-link-color: #90cdf4; /* Light blue, softer than accent */
    
    /* Tag Borders/Backgrounds (Dark) */
    --tag-bg-opacity: 0.05;
    --tag-border-opacity: 0.3;
}

[data-theme="light"] {
    /* Light Theme Overrides */
    --bg-color: #f7fafc;
    --sidebar-bg: #ffffff;
    --text-color: #2d3748;
    --text-muted: #718096;
    --accent-color: #3182ce;
    --card-bg: #ffffff;
    --card-hover: #edf2f7;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --border-color: #e2e8f0;

    /* Navigation & Links (Light) */
    --nav-active-bg: #ebf8ff;
    --link-hover-color: #2b6cb0;

    /* Repo Tag Colors (Light) */
    --repo-tag-public-rgb: 47, 133, 90;
    --repo-tag-private-rgb: 229, 62, 62;
    --repo-stats-bg: #edf2f7;

    /* Carousel (Light) */
    --carousel-btn-bg: rgba(255, 255, 255, 0.8);
    --carousel-btn-hover-bg: #edf2f7;

    /* Journal Title (Light) */
    --journal-title-color: #1a202c;

    /* Paper Link Color (Light) */
    --paper-link-color: #63b3ed; /* Light blue, softer than accent */

    /* Tag Colors (Light) */
    --tag-structural: #805ad5;
    --tag-surveys: #319795;
    --tag-rct: #2f855a;
    --tag-quasi: #dd6b20;
    --tag-market-design: #3182ce;
    --tag-policy: #e53e3e;
    --tag-data: #d69e2e;
    --tag-ai: #d53f8c;
    --tag-education: #319795;
    --tag-health: #d53f8c;
    --tag-labor: #dd6b20;
    --tag-theory: #805ad5;
    --tag-info: #3182ce;
    --tag-evolution: #2f855a;
    --tag-implementation: #718096;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    min-height: 100vh;
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Sidebar */
#sidebar {
    width: 300px;
    background-color: var(--sidebar-bg);
    padding: 2rem;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    box-shadow: 2px 0 10px rgba(0,0,0,0.05);
    z-index: 100;
    border-right: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

#sidebar .avatar {
    width: 150px;
    height: 150px;
    margin-bottom: 1.5rem;
    border-radius: 8px; /* Rectangular with slight rounding */
    overflow: hidden;
    border: 3px solid var(--sidebar-bg);
    box-shadow: var(--shadow-md);
    transition: border-color 0.3s ease;
}

#sidebar .avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

#sidebar h1 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

#sidebar h1 a {
    color: inherit;
    text-decoration: none;
}

#sidebar nav ul {
    list-style: none;
    margin-top: 2rem;
    width: 100%;
}

#sidebar nav ul li {
    margin-bottom: 0.8rem;
}

#sidebar nav ul li a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    display: block;
    padding: 0.75rem;
    border-radius: 6px;
    transition: all 0.3s ease;
}

#sidebar nav ul li a:hover,
#sidebar nav ul li a.active {
    background-color: var(--nav-active-bg);
    color: var(--accent-color);
    transform: translateX(5px);
}

#sidebar footer {
    margin-top: auto;
    padding-top: 2rem;
    width: 100%;
}

#sidebar .icons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    list-style: none;
    flex-wrap: wrap;
}

#sidebar .icons a {
    color: var(--text-muted);
    font-size: 1.2rem;
    transition: color 0.3s;
}

#sidebar .icons a:hover {
    color: var(--accent-color);
}

/* Main Content */
#main {
    margin-left: 300px;
    padding: 4rem;
    width: calc(100% - 300px);
    max-width: 1200px;
}

section {
    margin-bottom: 4rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

section.visible {
    opacity: 1;
    transform: translateY(0);
}

h2 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--text-color);
    border-bottom: 3px solid var(--accent-color);
    padding-bottom: 0.5rem;
    display: inline-block;
}

h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin: 2.5rem 0 1.5rem;
    color: var(--text-color);
    border-left: 4px solid var(--accent-color);
    padding-left: 1rem;
}

p {
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
    color: var(--text-color);
}

/* Cards */
.card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.card-content {
    flex: 1;
}

.card-image {
    flex: 0 0 150px;
    height: 100px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

@media (max-width: 600px) {
    .card {
        flex-direction: column-reverse;
        align-items: flex-start;
    }
    .card-image {
        width: 100%;
        height: 150px;
        flex: none;
    }
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    background-color: var(--card-hover);
}

.card blockquote {
    border-left: none;
    padding-left: 0;
    margin: 0;
    color: var(--text-muted);
}

.card a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
}

.card a:hover {
    text-decoration: underline;
    color: var(--link-hover-color);
}

/* Title Link */
.card blockquote > a:first-child {
    color: var(--accent-color);
    font-weight: 700;
    font-size: 1.1rem;
}

/* Other links (See paper, etc) */
.card blockquote > a:not(:first-child) {
    color: var(--text-muted);
    font-weight: 500;
}

.card blockquote > a:not(:first-child):hover {
    color: var(--accent-color);
}

/* Journal Names */
.card blockquote b i {
    color: var(--journal-title-color);
}

/* Carousel */
.carousel-container {
    margin-top: 1.5rem;
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    background: var(--card-bg);
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
}

.carousel-slide {
    display: none;
    width: 100%;
    height: auto;
    max-height: 400px;
    object-fit: contain;
}

.carousel-slide.active {
    display: block;
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--carousel-btn-bg);
    color: var(--text-color);
    border: none;
    padding: 1rem;
    cursor: pointer;
    font-size: 1.5rem;
    transition: background 0.3s;
    z-index: 10;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.carousel-btn:hover {
    background: var(--carousel-btn-hover-bg);
    box-shadow: var(--shadow-md);
}

.prev { left: 10px; }
.next { right: 10px; }

/* Modal/Popup */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    backdrop-filter: blur(3px);
}

.modal-content {
    background-color: var(--card-bg);
    padding: 3rem;
    border-radius: 16px;
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

.modal-content h3 {
    margin-top: 0;
    border-left: none;
    padding-left: 0;
    color: var(--text-color);
}

.popup-btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background-color: var(--accent-color);
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    margin-top: 1rem;
    margin-bottom: 1rem;
    transition: background-color 0.3s;
    text-align: center;
}

.popup-btn:hover {
    background-color: #2c5282;
    text-decoration: none;
    color: #fff;
}

.close-modal {
    position: absolute;
    top: 1.5rem;
    right: 2rem;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: color 0.3s;
}

.close-modal:hover {
    color: var(--text-color);
}

/* Education Timeline */
.timeline-item {
    position: relative;
    padding-left: 2rem;
    margin-bottom: 2rem;
    border-left: 2px solid var(--border-color);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 0;
    width: 10px;
    height: 10px;
    background: var(--accent-color);
    border-radius: 50%;
    border: 2px solid var(--card-bg);
    box-shadow: 0 0 0 2px var(--accent-color);
}

.timeline-item h4 {
    color: var(--text-color);
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

.timeline-item p {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin: 0;
}

/* GitHub Section */
.github-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.github-card img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

/* Repo List */
.repo-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.repo-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: background 0.2s;
}

.repo-item:hover {
    background: var(--card-hover);
}

.repo-item > div {
    display: flex;
    align-items: center;
}

.repo-item a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
}

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

.repo-stats {
    font-size: 0.85rem;
    color: var(--text-muted);
    background: var(--repo-stats-bg);
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
}

.repo-tag {
    font-size: 0.7rem;
    padding: 0.1rem 0.4rem;
    border-radius: 4px;
    margin-left: 0.5rem;
    font-weight: 600;
    text-transform: uppercase;
    border: 1px solid;
}

.repo-tag.public {
    color: rgb(var(--repo-tag-public-rgb));
    border-color: rgba(var(--repo-tag-public-rgb), 0.3);
    background-color: rgba(var(--repo-tag-public-rgb), 0.05);
}

.repo-tag.private {
    color: rgb(var(--repo-tag-private-rgb));
    border-color: rgba(var(--repo-tag-private-rgb), 0.3);
    background-color: rgba(var(--repo-tag-private-rgb), 0.05);
}

/* Tags */
.tags-container {
    display: flex;
    gap: 0.4rem;
    margin-top: 0.5rem;
    flex-wrap: wrap;
}

.tag {
    font-size: 0.6rem;
    font-weight: 600;
    padding: 0.1rem 0.5rem;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background-color: transparent;
    border: 1px solid;
    opacity: 0.8;
}

.tag-structural { color: rgb(var(--tag-structural-rgb)); border-color: rgba(var(--tag-structural-rgb), 0.3); background-color: rgba(var(--tag-structural-rgb), 0.05); }
.tag-surveys { color: rgb(var(--tag-surveys-rgb)); border-color: rgba(var(--tag-surveys-rgb), 0.3); background-color: rgba(var(--tag-surveys-rgb), 0.05); }
.tag-rct { color: rgb(var(--tag-rct-rgb)); border-color: rgba(var(--tag-rct-rgb), 0.3); background-color: rgba(var(--tag-rct-rgb), 0.05); }
.tag-quasi { color: rgb(var(--tag-quasi-rgb)); border-color: rgba(var(--tag-quasi-rgb), 0.3); background-color: rgba(var(--tag-quasi-rgb), 0.05); }
.tag-market-design { color: rgb(var(--tag-market-design-rgb)); border-color: rgba(var(--tag-market-design-rgb), 0.3); background-color: rgba(var(--tag-market-design-rgb), 0.05); }
.tag-policy { color: rgb(var(--tag-policy-rgb)); border-color: rgba(var(--tag-policy-rgb), 0.3); background-color: rgba(var(--tag-policy-rgb), 0.05); }
.tag-data { color: rgb(var(--tag-data-rgb)); border-color: rgba(var(--tag-data-rgb), 0.3); background-color: rgba(var(--tag-data-rgb), 0.05); }
.tag-ai { color: rgb(var(--tag-ai-rgb)); border-color: rgba(var(--tag-ai-rgb), 0.3); background-color: rgba(var(--tag-ai-rgb), 0.05); }

.tag-education { color: rgb(var(--tag-education-rgb)); border-color: rgba(var(--tag-education-rgb), 0.3); background-color: rgba(var(--tag-education-rgb), 0.05); }
.tag-health { color: rgb(var(--tag-health-rgb)); border-color: rgba(var(--tag-health-rgb), 0.3); background-color: rgba(var(--tag-health-rgb), 0.05); }
.tag-labor { color: rgb(var(--tag-labor-rgb)); border-color: rgba(var(--tag-labor-rgb), 0.3); background-color: rgba(var(--tag-labor-rgb), 0.05); }
.tag-theory { color: rgb(var(--tag-theory-rgb)); border-color: rgba(var(--tag-theory-rgb), 0.3); background-color: rgba(var(--tag-theory-rgb), 0.05); }
.tag-info { color: rgb(var(--tag-info-rgb)); border-color: rgba(var(--tag-info-rgb), 0.3); background-color: rgba(var(--tag-info-rgb), 0.05); }
.tag-evolution { color: rgb(var(--tag-evolution-rgb)); border-color: rgba(var(--tag-evolution-rgb), 0.3); background-color: rgba(var(--tag-evolution-rgb), 0.05); }
.tag-implementation { color: rgb(var(--tag-implementation-rgb)); border-color: rgba(var(--tag-implementation-rgb), 0.3); background-color: rgba(var(--tag-implementation-rgb), 0.05); }

/* Apply opacity to background and border using rgba trick or just opacity on element if possible, 
   but here we need specific color opacity. 
   Let's use a simpler approach: define the full rgba in variables or use a mix-blend-mode.
   Actually, the previous CSS used rgba(r,g,b, 0.05). 
   To support themes easily without complex calc(), we can use the 'opacity' property on the background 
   if we use a pseudo-element, OR we can just set the colors directly in the theme variables 
   including the alpha channel if we want to be precise.
   
   However, to keep it simple and working with the variables I defined above (hex codes),
   I will use a small trick: `color-mix` if supported, or just set opacity on the background color 
   if I can.
   
   Wait, the easiest way is to just use the hex codes I defined and add opacity to the background 
   using `background-color: color-mix(in srgb, var(--tag-color), transparent 95%)`.
   But `color-mix` support might be an issue for older browsers.
   
   Let's stick to the previous implementation but use the variables.
   Since I can't easily convert hex var to rgba in pure CSS without color-mix, 
   I will update the variables to be RGB comma separated values.
*/

/* Redefining variables to be RGB triplets for easier alpha usage */
:root {
    --tag-structural-rgb: 214, 188, 250;
    --tag-surveys-rgb: 129, 230, 217;
    --tag-rct-rgb: 104, 211, 145;
    --tag-quasi-rgb: 246, 173, 85;
    --tag-market-design-rgb: 99, 179, 237;
    --tag-policy-rgb: 252, 129, 129;
    --tag-data-rgb: 246, 224, 94;
    --tag-ai-rgb: 246, 135, 179;
    --tag-education-rgb: 79, 209, 197;
    --tag-health-rgb: 246, 135, 179;
    --tag-labor-rgb: 246, 173, 85;
    --tag-theory-rgb: 159, 122, 234;
    --tag-info-rgb: 99, 179, 237;
    --tag-evolution-rgb: 104, 211, 145;
    --tag-implementation-rgb: 160, 174, 192;
}

[data-theme="light"] {
    --tag-structural-rgb: 128, 90, 213;
    --tag-surveys-rgb: 49, 151, 149;
    --tag-rct-rgb: 47, 133, 90;
    --tag-quasi-rgb: 221, 107, 32;
    --tag-market-design-rgb: 49, 130, 206;
    --tag-policy-rgb: 229, 62, 62;
    --tag-data-rgb: 214, 158, 46;
    --tag-ai-rgb: 213, 63, 140;
    --tag-education-rgb: 49, 151, 149;
    --tag-health-rgb: 213, 63, 140;
    --tag-labor-rgb: 221, 107, 32;
    --tag-theory-rgb: 128, 90, 213;
    --tag-info-rgb: 49, 130, 206;
    --tag-evolution-rgb: 47, 133, 90;
    --tag-implementation-rgb: 113, 128, 150;
}

.tag {
    /* Re-implementing using the RGB variables */
    background-color: transparent;
    border: 1px solid;
}

.tag-structural { color: rgb(var(--tag-structural-rgb)); border-color: rgba(var(--tag-structural-rgb), 0.3); background-color: rgba(var(--tag-structural-rgb), 0.05); }
.tag-surveys { color: rgb(var(--tag-surveys-rgb)); border-color: rgba(var(--tag-surveys-rgb), 0.3); background-color: rgba(var(--tag-surveys-rgb), 0.05); }
.tag-rct { color: rgb(var(--tag-rct-rgb)); border-color: rgba(var(--tag-rct-rgb), 0.3); background-color: rgba(var(--tag-rct-rgb), 0.05); }
.tag-quasi { color: rgb(var(--tag-quasi-rgb)); border-color: rgba(var(--tag-quasi-rgb), 0.3); background-color: rgba(var(--tag-quasi-rgb), 0.05); }
.tag-market-design { color: rgb(var(--tag-market-design-rgb)); border-color: rgba(var(--tag-market-design-rgb), 0.3); background-color: rgba(var(--tag-market-design-rgb), 0.05); }
.tag-policy { color: rgb(var(--tag-policy-rgb)); border-color: rgba(var(--tag-policy-rgb), 0.3); background-color: rgba(var(--tag-policy-rgb), 0.05); }
.tag-data { color: rgb(var(--tag-data-rgb)); border-color: rgba(var(--tag-data-rgb), 0.3); background-color: rgba(var(--tag-data-rgb), 0.05); }
.tag-ai { color: rgb(var(--tag-ai-rgb)); border-color: rgba(var(--tag-ai-rgb), 0.3); background-color: rgba(var(--tag-ai-rgb), 0.05); }

.tag-education { color: rgb(var(--tag-education-rgb)); border-color: rgba(var(--tag-education-rgb), 0.3); background-color: rgba(var(--tag-education-rgb), 0.05); }
.tag-health { color: rgb(var(--tag-health-rgb)); border-color: rgba(var(--tag-health-rgb), 0.3); background-color: rgba(var(--tag-health-rgb), 0.05); }
.tag-labor { color: rgb(var(--tag-labor-rgb)); border-color: rgba(var(--tag-labor-rgb), 0.3); background-color: rgba(var(--tag-labor-rgb), 0.05); }
.tag-theory { color: rgb(var(--tag-theory-rgb)); border-color: rgba(var(--tag-theory-rgb), 0.3); background-color: rgba(var(--tag-theory-rgb), 0.05); }
.tag-info { color: rgb(var(--tag-info-rgb)); border-color: rgba(var(--tag-info-rgb), 0.3); background-color: rgba(var(--tag-info-rgb), 0.05); }
.tag-evolution { color: rgb(var(--tag-evolution-rgb)); border-color: rgba(var(--tag-evolution-rgb), 0.3); background-color: rgba(var(--tag-evolution-rgb), 0.05); }
.tag-implementation { color: rgb(var(--tag-implementation-rgb)); border-color: rgba(var(--tag-implementation-rgb), 0.3); background-color: rgba(var(--tag-implementation-rgb), 0.05); }

.calendar {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    overflow-x: auto;
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    background-color: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
    background-color: var(--card-hover);
}

.theme-toggle i {
    font-size: 1.2rem;
    transition: transform 0.5s ease;
}

/* Rotate icon when switching */
.theme-toggle.rotate i {
    transform: rotate(360deg);
}

/* Responsive */
@media (max-width: 900px) {
    body {
        flex-direction: column;
    }
    
    #sidebar {
        width: 100%;
        height: auto;
        position: relative;
        padding: 1rem;
        border-right: none;
        border-bottom: 1px solid #4a5568;
    }
    
    #main {
        margin-left: 0;
        width: 100%;
        padding: 2rem;
    }
    
    #sidebar nav ul {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
    
    #sidebar nav ul li {
        margin: 0;
    }
}