/* Root Variables */
:root {
    --max-width: 900px;
    --primary-color: #333;
    --background-color: #fff;
    --card-background: #f9f9f9;
    --text-color: #333;
    --link-color: #0066cc;
    --link-hover-color: #003366;
    --secondary-text-color: #666;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
}

/* Dark Theme */
[data-theme="dark"] {
    --primary-color: #eee;
    --background-color: #121212;
    --card-background: #1e1e1e;
    --text-color: #f0f0f0;
    --link-color: #4d9eff;
    --link-hover-color: #77b5ff;
    --secondary-text-color: #aaa;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    padding: var(--spacing-md);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    z-index: 100;
    color: var(--text-color);
}

/* Header Section */
.header {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.profile-photo {
    flex: 0 0 200px;
    max-width: 200px;
}

.profile-photo img {
    width: 100%;
    border-radius: 50%;
    object-fit: cover;
}

.header-content {
    flex: 1;
    min-width: 0;
}

.name {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

.links {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-top: var(--spacing-sm);
}

.links a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.links a:hover {
    color: var(--link-hover-color);
}

/* Research Section */
.research-section {
    margin: var(--spacing-lg) 0;
}

h2 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
}

.research-entry {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    background: var(--card-background);
    padding: var(--spacing-md);
    border-radius: 8px;
    transition: background-color 0.3s ease;
}

.research-media {
    flex: 0 0 25%;
    position: relative;
    overflow: hidden;
}

.research-media img,
.research-media video {
    width: 100%;
    object-fit: cover;
    border-radius: 4px;
}

.research-text {
    flex: 1;
}

.papertitle {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-color);
    margin-bottom: 0.3rem;
    display: inline-block;
}

.research-text a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Author styling - switching from red to a more subtle highlight */
.research-text strong {
    color: #3498db;  /* A more subtle blue */
    font-weight: 700;
}

[data-theme="dark"] .research-text strong {
    color: #5dade2;  /* Lighter blue for dark mode */
}

/* Project links styling */
.research-text .paper-links {
    display: inline-flex;
    gap: 0.75rem;
    margin-top: 0.5rem;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
}

.research-text .paper-links a {
    background-color: rgba(0, 102, 204, 0.1);
    color: var(--link-color);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
    border: 1px solid rgba(0, 102, 204, 0.2);
}

.research-text .paper-links a:hover {
    background-color: var(--link-color);
    color: white;
    text-decoration: none;
}

[data-theme="dark"] .research-text .paper-links a {
    background-color: rgba(77, 158, 255, 0.15);
    border: 1px solid rgba(77, 158, 255, 0.25);
}

[data-theme="dark"] .research-text .paper-links a:hover {
    background-color: var(--link-color);
    color: #121212;
}

/* Footer */
.footer {
    font-size: 0.875rem;
    text-align: center;
    color: var(--secondary-text-color);
    margin-top: var(--spacing-lg);
}

.footer a {
    color: var(--link-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        text-align: center;
    }

    .profile-photo {
        flex: 0 0 150px;
    }

    .research-entry {
        flex-direction: column;
    }

    .research-media {
        flex: 0 0 auto;
        max-width: 300px;
        margin: 0 auto;
    }

    .links {
        gap: 0.75rem;
    }
}

@media (max-width: 480px) {
    body {
        padding: var(--spacing-sm);
    }

    .profile-photo {
        flex: 0 0 120px;
    }

    h2 {
        font-size: 1.5rem;
    }

    .papertitle {
        font-size: 1.1rem;
    }
}

/* Hover Effects */
.research-media .two {
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.research-entry:hover .two {
    opacity: 1;
}