/* ==========================================
   CSS Variables & Root Styles
   ========================================== */
:root {
    --color-primary: #ecf0f1;
    --color-secondary: #bdc3c7;
    --color-accent: #3498db;

    --color-text: #f2f2f2;
    --color-text-light: #b0b0b0;

    /* --color-background: #0f1115; */
    --color-background: #171a21;
    --color-background-alt: #171a21;

    /* --color-border: #2a2f3a; */
    --color-border: #171a21;

    --font-display: 'Crimson Pro', serif;
    --font-body: 'Work Sans', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    --transition-speed: 0.3s;
}
:root {
    --color-primary: #ecf0f1;
    --color-secondary: #bdc3c7;
    --color-accent: #3498db;

    --color-text: #f2f2f2;
    --color-text-light: #b0b0b0;

    /* --color-background: #0f1115; */
    --color-background: #171a21;
    --color-background-alt: #171a21;

    /* --color-border: #2a2f3a; */
    --color-border: #171a21;

    --font-display: 'Crimson Pro', serif;
    --font-body: 'Work Sans', sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    --transition-speed: 0.3s;
}


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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================
   Typography
   ========================================== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: all var(--transition-speed) ease;
    border-bottom: 1px solid transparent;
}

a:hover {
    border-bottom-color: var(--color-accent);
    opacity: 0.8;
}

/* ==========================================
   Container & Layout
   ========================================== */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ==========================================
   Header Styles
   ========================================== */
.site-header {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    background: linear-gradient(to bottom, var(--color-background) 0%, var(--color-background-alt) 100%);
    animation: fadeInDown 0.8s ease;
}

.site-title {
    margin-bottom: var(--spacing-xs);
}

.site-title a {
    color: var(--color-primary);
    font-size: 2.2rem;
    font-weight: 600;
    border: none;
    letter-spacing: -0.02em;
}

.site-title a:hover {
    color: var(--color-accent);
    border: none;
}

.site-subtitle {
    color: var(--color-text-light);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
    font-weight: 400;
}

/* ==========================================
   Navigation Styles
   ========================================== */
.main-nav ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.main-nav a {
    color: var(--color-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    padding: var(--spacing-xs) 0;
    border: none;
    position: relative;
    letter-spacing: 0.02em;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width var(--transition-speed) ease;
}

.main-nav a:hover::after {
    width: 100%;
}

.main-nav a:hover {
    color: var(--color-accent);
    opacity: 1;
}

/* ==========================================
   Main Content Layout
   ========================================== */
.content-wrapper {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--spacing-xl);
    padding: var(--spacing-xl) 0;
    animation: fadeIn 1s ease;
}

/* ==========================================
   Sidebar Styles
   ========================================== */
.sidebar {
    position: sticky;
    top: var(--spacing-lg);
    align-self: start;
}

.profile-card {
    background: var(--color-background);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.profile-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.profile-photo {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
}

.profile-card:hover .profile-photo {
    transform: scale(1.05);
}

.photo-credit {
    padding: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--color-text-light);
    font-style: italic;
    background: var(--color-background-alt);
    text-align: center;
}

/* ==========================================
   Main Content Styles
   ========================================== */
.main-content {
    background: var(--color-background);
    padding: var(--spacing-lg);
    border-radius: 8px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
}

.bio {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--color-text);
}

.bio p:last-child {
    margin-bottom: 0;
}

/* ==========================================
   Publications Page Styles
   ========================================== */
.publications-list {
    list-style: none;
}

.publication-item {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
    animation: slideInLeft 0.6s ease;
    animation-fill-mode: both;
}

.publication-item:last-child {
    border-bottom: none;
}

.publication-item:nth-child(1) { animation-delay: 0.1s; }
.publication-item:nth-child(2) { animation-delay: 0.2s; }
.publication-item:nth-child(3) { animation-delay: 0.3s; }
.publication-item:nth-child(4) { animation-delay: 0.4s; }
.publication-item:nth-child(5) { animation-delay: 0.5s; }

.publication-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.publication-authors {
    color: var(--color-text-light);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-xs);
}

.publication-venue {
    color: var(--color-text);
    font-size: 0.9rem;
    font-style: italic;
}

.publication-links {
    margin-top: var(--spacing-xs);
    display: flex;
    gap: var(--spacing-sm);
}

.publication-links a {
    font-size: 0.85rem;
    padding: 0.25rem 0.75rem;
    background: var(--color-background-alt);
    border-radius: 4px;
    border: 1px solid var(--color-border);
    transition: all var(--transition-speed) ease;
}

.publication-links a:hover {
    background: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

/* ==========================================
   Contact Page Styles
   ========================================== */
.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-item {
    display: flex;
    align-items: start;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--color-background-alt);
    border-radius: 6px;
    animation: fadeInUp 0.6s ease;
    animation-fill-mode: both;
}

.contact-item:nth-child(1) { animation-delay: 0.1s; }
.contact-item:nth-child(2) { animation-delay: 0.2s; }
.contact-item:nth-child(3) { animation-delay: 0.3s; }

.contact-label {
    font-weight: 600;
    color: var(--color-primary);
    min-width: 100px;
}

.contact-value a {
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
}

.contact-value a:hover {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

/* ==========================================
   Footer Styles
   ========================================== */
.site-footer {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
    background: var(--color-background-alt);
}

.site-footer p {
    color: var(--color-text-light);
    font-size: 0.9rem;
    margin: 0;
}

.site-footer a {
    color: var(--color-text-light);
}

.site-footer a:hover {
    color: var(--color-accent);
}

/* ==========================================
   Mobile Navigation Toggle
   ========================================== */
.mobile-nav-toggle {
    display: none;
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--color-accent);
    color: white;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: transform var(--transition-speed) ease;
}

.mobile-nav-toggle:hover {
    transform: scale(1.1);
}

/* ==========================================
   Animations
   ========================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-lg: 1.5rem;
    }
    
    .site-title a {
        font-size: 1.8rem;
    }
    
    .content-wrapper {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .sidebar {
        position: static;
        max-width: 300px;
        margin: 0 auto;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .mobile-nav-toggle {
        display: flex;
    }
    
    .main-nav {
        display: none;
    }
    
    .main-nav.active {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: white;
        z-index: 999;
        padding: var(--spacing-xl);
    }
    
    .main-nav.active ul {
        margin-top: var(--spacing-xl);
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
    
    .bio {
        font-size: 1rem;
    }
}

/* ==========================================
   Print Styles
   ========================================== */
@media print {
    .site-header,
    .site-footer,
    .mobile-nav-toggle {
        display: none;
    }
    
    body {
        font-size: 12pt;
    }
    
    a {
        color: black;
        border-bottom: none;
    }
}