/* =======================================================
   Daniel Mangrum - Minimalist Academic Website
   ======================================================= */

:root {
    --primary-color: #1a365d;
    --accent-color: #c53030;
    --text-color: #2d3748;
    --text-muted: #718096;
    --bg-color: #ffffff;
    --bg-secondary: #f7fafc;
    --border-color: #e2e8f0;
    --link-color: #2b6cb0;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-color);
    background: var(--bg-color);
}

/* Typography */
h1, h2, h3, h4 {
    color: var(--primary-color);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

p {
    margin-bottom: 1rem;
}

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

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

/* Layout */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

.container-narrow {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.nav {
    position: sticky;
    top: 0;
    background: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 1rem 0;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-logo:hover {
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-color);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-color);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-color);
}

/* Mobile Navigation */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-color);
    margin: 5px 0;
    transition: 0.3s;
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-color);
        flex-direction: column;
        padding: 1rem 2rem;
        gap: 0;
        border-bottom: 1px solid var(--border-color);
    }

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

    .nav-links li {
        padding: 0.75rem 0;
        border-bottom: 1px solid var(--border-color);
    }

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

/* Hero Section (Home) */
.hero {
    padding: 4rem 0;
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 3rem;
    align-items: start;
}

@media (max-width: 768px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

.hero-image {
    width: 250px;
    height: 320px;
    border-radius: 8px;
    object-fit: cover;
    object-position: center top;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

@media (max-width: 768px) {
    .hero-image {
        width: 220px;
        height: 280px;
        margin: 0 auto;
    }
}

.hero-content h1 {
    margin-bottom: 0.5rem;
}

.hero-subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.hero-bio {
    font-size: 1rem;
    line-height: 1.8;
}

.hero-links {
    display: flex;
    gap: 1.5rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    .hero-links {
        justify-content: center;
    }
}

.hero-links a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

/* Section Styles */
.section {
    padding: 3rem 0;
    border-top: 1px solid var(--border-color);
}

.section-title {
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.section-title::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

/* Featured Section on Home - see bottom for grid definition */

.featured-card {
    background: var(--bg-secondary);
    border-radius: 8px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: box-shadow 0.2s ease;
}

.featured-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

.featured-card-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.featured-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.featured-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0;
}

.featured-card .meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.75rem;
}

/* Research Page Styles */
.research-section {
    margin-bottom: 3rem;
}

.research-section h2 {
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-color);
    margin-bottom: 1.5rem;
}

.paper {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.paper:last-child {
    border-bottom: none;
}

.paper-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.paper-title a {
    color: inherit;
}

.paper-title a:hover {
    color: var(--accent-color);
}

.paper-authors {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-style: italic;
    margin-bottom: 0.5rem;
}

.paper-venue {
    font-size: 0.9rem;
    color: var(--text-color);
    margin-bottom: 0.75rem;
}

.paper-status {
    display: inline-block;
    font-size: 0.8rem;
    padding: 0.2rem 0.6rem;
    background: var(--bg-secondary);
    border-radius: 4px;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

/* Expandable Sections */
.expandable {
    margin-top: 0.75rem;
}

.expand-toggle {
    background: none;
    border: none;
    color: var(--link-color);
    font-size: 0.9rem;
    cursor: pointer;
    padding: 0.25rem 0;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: inherit;
}

.expand-toggle:hover {
    color: var(--accent-color);
}

.expand-toggle::before {
    content: '+';
    font-weight: bold;
    width: 1rem;
    transition: transform 0.2s;
}

.expand-toggle.active::before {
    content: '-';
}

.expand-content {
    display: none;
    margin-top: 0.75rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 6px;
    border-left: 3px solid var(--accent-color);
}

.expand-content.active {
    display: block;
}

.expand-content p {
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
}

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

.main-points {
    background: #fffaf0;
    border-left-color: #dd6b20;
}

.main-points h4 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: #dd6b20;
    margin-bottom: 0.5rem;
}

/* Blog/Policy Section */
.blog-grid {
    display: grid;
    gap: 1.5rem;
}

.blog-item {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: box-shadow 0.2s ease;
}

.blog-item:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

@media (max-width: 600px) {
    .blog-item {
        grid-template-columns: 1fr;
    }

    .blog-image {
        display: none;
    }
}

.blog-image {
    width: 120px;
    height: 80px;
    object-fit: cover;
    border-radius: 4px;
}

.blog-content h3 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.blog-content .meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.blog-content .coauthors {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-style: italic;
}

.blog-content .media-coverage {
    margin-top: 0.5rem;
    font-size: 0.8rem;
}

.blog-content .media-coverage span {
    font-weight: 600;
    color: var(--text-color);
}

.blog-content .media-coverage a {
    color: var(--text-muted);
    margin-right: 0.5rem;
}

.blog-content .media-coverage a:hover {
    color: var(--accent-color);
}

/* CV Page */
.cv-section {
    text-align: center;
    padding: 4rem 0;
}

.cv-download {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    background: var(--primary-color);
    color: white;
    border-radius: 8px;
    font-weight: 500;
    font-size: 1.1rem;
    transition: background 0.2s ease;
}

.cv-download:hover {
    background: var(--accent-color);
    color: white;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    padding: 3rem 0;
    margin-top: 4rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

.footer h4 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.footer ul {
    list-style: none;
}

.footer li {
    margin-bottom: 0.5rem;
}

.footer a {
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

.footer-disclaimer {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* View All Link */
.view-all {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    margin-top: 1rem;
}

.view-all::after {
    content: '\2192';
}

/* Filter/Tab Navigation for Blogs */
.filter-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.filter-tab {
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.filter-tab:hover,
.filter-tab.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Year grouping */
.year-group {
    margin-bottom: 2rem;
}

.year-group.hidden {
    display: none;
}

.year-label {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-muted);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

/* Topic Tags */
.topic-tag {
    display: inline-block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.2rem 0.5rem;
    background: var(--accent-color);
    color: white;
    border-radius: 3px;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

/* Blog item hidden state for filtering */
.blog-item.hidden {
    display: none;
}

/* CV PDF Preview */
.cv-preview {
    margin-top: 2rem;
    width: 100%;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.cv-preview iframe {
    width: 100%;
    height: 600px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

@media (max-width: 768px) {
    .cv-preview iframe {
        height: 400px;
    }
}

/* Featured grid 3 columns for 6 items */
.featured-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

@media (max-width: 992px) {
    .featured-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .featured-grid {
        grid-template-columns: 1fr;
    }
}