/* ============================================
   Academic Website Stylesheet
   Clean, professional design for economics researchers
   ============================================ */

/* CSS Variables for easy customization */
:root {
    /* Colors - UChicago Maroon palette */
    --color-primary: #800000;
    --color-primary-light: #a61c1c;
    --color-primary-dark: #5c0000;
    --color-accent: #800000;
    --color-accent-hover: #5c0000;
    
    --color-text: #2d3748;
    --color-text-light: #4a5568;
    --color-text-muted: #718096;
    
    --color-background: #ffffff;
    --color-background-alt: #faf8f8;
    --color-border: #e8e0e0;
    
    --color-link: #800000;
    --color-link-hover: #5c0000;
    
    /* Typography */
    --font-sans: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Layout */
    --max-width: 900px;
    --nav-height: 70px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* ============================================
   Reset & Base Styles
   ============================================ */

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

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

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-primary);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: 1.875rem;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-primary);
}

h3 {
    font-size: 1.375rem;
    color: var(--color-text);
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-lg);
    font-weight: 600;
}

h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

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

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

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

strong {
    font-weight: 600;
}

em {
    font-style: italic;
}

/* ============================================
   Layout
   ============================================ */

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

section {
    padding: var(--spacing-3xl) 0;
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-minimal .nav-container {
    justify-content: flex-end;
}

.navbar-minimal .nav-menu {
    margin-left: auto;
}

.nav-brand {
    font-family: var(--font-serif);
    font-size: 1.375rem;
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
}

.nav-brand:hover {
    color: var(--color-primary-light);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-menu a {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text);
    text-decoration: none;
    padding: var(--spacing-sm) 0;
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width var(--transition-normal);
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--color-primary);
    text-decoration: none;
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: var(--transition-fast);
}

/* ============================================
   Hero / About Section
   ============================================ */

.hero {
    padding-top: calc(var(--nav-height) + var(--spacing-3xl));
    background-color: var(--color-background);
}

.hero-content {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.hero-image {
    position: relative;
}

.hero-image img {
    width: 200px;
    height: 250px;
    object-fit: cover;
    border-radius: 4px;
    box-shadow: var(--shadow-md);
}

.image-placeholder {
    display: none;
    width: 200px;
    height: 250px;
    background-color: var(--color-background-alt);
    border: 2px dashed var(--color-border);
    border-radius: 4px;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.hero-text h1 {
    font-size: 2.75rem;
    margin-bottom: var(--spacing-md);
}

.name-note {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.pronunciation-ipa {
    text-decoration: underline;
    text-decoration-style: dotted;
    text-underline-offset: 2px;
}

.tagline {
    font-size: 1.125rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
    font-style: italic;
}

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

.affiliations p {
    margin-bottom: 0;
    line-height: 1.6;
}

.affiliations-secondary {
    margin-bottom: var(--spacing-lg);
    font-size: 0.9375rem;
}

.affiliations-secondary p {
    margin-bottom: 0;
    color: var(--color-text-light);
}

.contact-info {
    margin-bottom: var(--spacing-lg);
}

.contact-info a {
    display: inline-block;
}

.cv-link {
    font-weight: 500;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.social-links a:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    background-color: var(--color-background-alt);
}

/* ============================================
   Experience Section
   ============================================ */

.experience {
    background-color: var(--color-background-alt);
}

.page-section {
    padding-top: calc(var(--nav-height) + var(--spacing-3xl));
    min-height: calc(100vh - 120px);
}

.experience-item {
    background-color: var(--color-background);
    padding: var(--spacing-xl);
    border-radius: 4px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    border-left: 4px solid var(--color-primary);
}

.experience-item h4 {
    font-family: var(--font-sans);
    color: var(--color-primary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

.experience-period {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.experience-description {
    font-size: 1rem;
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 0;
}

/* ============================================
   Footer
   ============================================ */

footer {
    background-color: var(--color-primary-dark);
    color: rgba(255, 255, 255, 0.8);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

footer p {
    margin-bottom: var(--spacing-xs);
    font-size: 0.875rem;
}

.footer-note {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.8125rem !important;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
    :root {
        --nav-height: 60px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    .container {
        padding: 0 var(--spacing-lg);
    }

    section {
        padding: var(--spacing-2xl) 0;
    }

    /* Mobile Navigation */
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        flex-direction: column;
        background-color: var(--color-background);
        border-bottom: 1px solid var(--color-border);
        padding: var(--spacing-md) var(--spacing-xl);
        gap: 0;
        display: none;
        box-shadow: var(--shadow-md);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        border-bottom: 1px solid var(--color-border);
    }

    .nav-menu li:last-child {
        border-bottom: none;
    }

    .nav-menu a {
        display: block;
        padding: var(--spacing-md) 0;
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    /* Hero responsive */
    .hero {
        padding-top: calc(var(--nav-height) + var(--spacing-xl));
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-image {
        margin: 0 auto;
    }

    .hero-image img,
    .image-placeholder {
        width: 160px;
        height: 200px;
    }

    .affiliations,
    .affiliations-secondary,
    .contact-info {
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }

    /* Teaching responsive */
    .teaching-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.75rem;
    }

    .container {
        padding: 0 var(--spacing-md);
    }

    .paper h4 {
        font-size: 1rem;
    }

    .paper-link {
        display: block;
        margin-bottom: var(--spacing-xs);
    }
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    .navbar,
    .nav-toggle,
    .social-links {
        display: none !important;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
    }

    .hero {
        padding-top: 0;
    }

    section {
        padding: 1rem 0;
    }

    a {
        color: var(--color-text);
        text-decoration: underline;
    }

    .abstract[open] p {
        border-left: 2px solid #000;
        background: none;
    }
}

/* ============================================
   Office Hours Section
   ============================================ */

.office-hours {
    background-color: var(--color-background);
}

.office-hours-content {
    max-width: 600px;
}

.office-hours-content p {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.calendly-button {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--color-primary);
    color: #ffffff;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 4px;
    transition: background-color var(--transition-fast);
}

.calendly-button:hover {
    background-color: var(--color-primary-dark);
    color: #ffffff;
    text-decoration: none;
}

/* ============================================
   Utility Classes
   ============================================ */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--color-text-muted);
}

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mt-1 { margin-top: var(--spacing-md); }
.mb-1 { margin-bottom: var(--spacing-md); }
.mt-2 { margin-top: var(--spacing-xl); }
.mb-2 { margin-bottom: var(--spacing-xl); }