/* ============================================
   CSS Variables & Design System
   ============================================ */
:root {
    /* Colors - Warm dark theme with sand/cream accents */
    --bg-primary: #0d0d0d;
    --bg-secondary: #141414;
    --bg-tertiary: #1a1a1a;
    --bg-card: #181818;
    
    --text-primary: #f5f0e8;
    --text-secondary: #a8a29e;
    --text-muted: #6b6561;
    
    --accent: #d4a574;
    --accent-light: #e8c9a8;
    --accent-subtle: rgba(212, 165, 116, 0.1);
    
    --border: rgba(245, 240, 232, 0.08);
    --border-hover: rgba(245, 240, 232, 0.15);
    
    /* Typography */
    --font-serif: 'Cormorant Garamond', Georgia, serif;
    --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Container */
    --container-max: 720px;
    --container-wide: 900px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s ease;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    min-height: 100vh;
}

/* Ambient Background */
.ambient-bg {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: -1;
    background: 
        radial-gradient(ellipse 80% 50% at 20% -10%, rgba(212, 165, 116, 0.05) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 80% 100%, rgba(212, 165, 116, 0.03) 0%, transparent 50%),
        var(--bg-primary);
    pointer-events: none;
}

/* Selection */
::selection {
    background: var(--accent);
    color: var(--bg-primary);
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 500;
    line-height: 1.3;
    color: var(--text-primary);
}

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

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

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

strong {
    font-weight: 600;
    color: var(--text-primary);
}

em {
    font-style: italic;
}

code {
    font-family: 'SF Mono', Monaco, 'Courier New', monospace;
    font-size: 0.9em;
    background: var(--bg-tertiary);
    padding: 0.15em 0.4em;
    border-radius: 4px;
    color: var(--accent);
}

/* ============================================
   Navigation
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--space-lg) var(--space-xl);
    background: linear-gradient(to bottom, var(--bg-primary) 0%, transparent 100%);
    transition: background var(--transition-base);
}

.nav-container {
    max-width: var(--container-wide);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
    transition: color var(--transition-fast);
}

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

.nav-links {
    display: flex;
    gap: var(--space-xl);
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
    position: relative;
    padding-bottom: 4px;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent);
    transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

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

/* ============================================
   Main Layout
   ============================================ */
.main {
    padding-top: 120px;
    padding-bottom: var(--space-4xl);
}

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

/* ============================================
   Hero Section
   ============================================ */
.hero {
    padding: var(--space-3xl) 0;
}

.hero-content {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.hero-image-wrapper {
    position: relative;
    margin-bottom: var(--space-2xl);
}

.hero-image-container {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid var(--border);
    position: relative;
    z-index: 1;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(10%);
    transition: filter var(--transition-slow);
}

.hero-image-container:hover .hero-image {
    filter: grayscale(0%);
}

.hero-image-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, var(--accent-subtle) 0%, transparent 70%);
    border-radius: 50%;
    z-index: 0;
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.hero-image-wrapper:hover .hero-image-glow {
    opacity: 1;
}

.hero-text {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 3.5rem);
    font-weight: 500;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-sm);
}

.title-line {
    display: block;
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.1s forwards;
}

.hero-email {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: var(--space-xl);
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.2s forwards;
}

.hero-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md);
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.3s forwards;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    transition: all var(--transition-fast);
}

.social-link:hover {
    color: var(--text-primary);
    border-color: var(--border-hover);
    background: var(--bg-card);
}

.link-arrow {
    transition: transform var(--transition-fast);
}

.social-link:hover .link-arrow {
    transform: translate(2px, -2px);
}

/* ============================================
   About & Content Sections
   ============================================ */
.about,
.background,
.interests {
    padding: var(--space-3xl) 0;
}

.section-title {
    font-size: 1rem;
    font-family: var(--font-sans);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent);
    margin-bottom: var(--space-xl);
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.about-text {
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.1s forwards;
}

.about-text p {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

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

/* Contributions List */
.contributions {
    margin-top: var(--space-xl);
    padding: var(--space-xl);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
}

.contributions-title {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: var(--space-lg);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.contributions-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.contributions-list li {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    padding-left: var(--space-md);
    border-left: 2px solid var(--border);
    transition: border-color var(--transition-fast);
}

.contributions-list li:hover {
    border-left-color: var(--accent);
}

.contributions-list li a {
    font-weight: 500;
    font-size: 1rem;
}

.contribution-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Research Questions */
.research-questions {
    margin-top: var(--space-xl);
}

.questions-title {
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
}

.questions-list {
    padding-left: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.questions-list li {
    font-size: 1rem;
    color: var(--text-secondary);
    padding-left: var(--space-sm);
}

.questions-list li::marker {
    color: var(--accent);
}

.closing-note {
    margin-top: var(--space-xl);
    font-style: italic;
    color: var(--text-muted);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: var(--space-2xl) var(--space-xl);
    border-top: 1px solid var(--border);
}

.footer-content {
    max-width: var(--container-max);
    margin: 0 auto;
    text-align: center;
}

.footer-text {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ============================================
   Blog Page Styles
   ============================================ */
.blog-main {
    padding-top: 100px;
}

.blog-header {
    padding: var(--space-3xl) 0 var(--space-xl);
    text-align: center;
}

.page-title {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: var(--space-sm);
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.page-subtitle {
    font-size: 1.0625rem;
    color: var(--text-secondary);
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.1s forwards;
}

/* Blog Card */
.blog-list {
    padding-bottom: var(--space-3xl);
}

.blog-card {
    display: block;
    padding: var(--space-xl);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: all var(--transition-base);
    opacity: 0;
    animation: fadeInUp 0.6s ease 0.2s forwards;
}

.blog-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.blog-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: var(--space-md);
}

.blog-card-title {
    font-size: 1.5rem;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.blog-card:hover .blog-card-title {
    color: var(--accent);
}

.blog-card-excerpt {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.7;
}

.blog-read-more {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.blog-card:hover .blog-read-more {
    color: var(--accent);
}

/* Blog Post */
.blog-post {
    padding: var(--space-2xl) 0 var(--space-4xl);
    border-top: 1px solid var(--border);
}

.post-header {
    text-align: center;
    margin-bottom: var(--space-3xl);
    padding-bottom: var(--space-2xl);
    border-bottom: 1px solid var(--border);
}

.post-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--space-lg);
}

.post-intro {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Table of Contents */
.post-toc {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: var(--space-xl);
    margin-bottom: var(--space-3xl);
}

.post-toc h3 {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: var(--space-lg);
}

.post-toc ol {
    list-style: none;
    counter-reset: toc-counter;
}

.post-toc li {
    counter-increment: toc-counter;
    margin-bottom: var(--space-sm);
}

.post-toc li::before {
    content: counter(toc-counter) ".";
    color: var(--accent);
    font-weight: 500;
    margin-right: var(--space-sm);
}

.post-toc a {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.post-toc a:hover {
    color: var(--text-primary);
}

/* Post Content */
.post-content {
    font-size: 1.0625rem;
    color: var(--text-secondary);
}

.post-section {
    margin-bottom: var(--space-3xl);
}

.post-section h2 {
    font-size: 1.75rem;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    padding-top: var(--space-xl);
}

.post-section h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
}

.post-section h4 {
    font-size: 1rem;
    font-family: var(--font-sans);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.post-section ul,
.post-section ol {
    padding-left: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.post-section li {
    margin-bottom: var(--space-sm);
}

.post-section li::marker {
    color: var(--accent);
}

/* Disclaimer */
.disclaimer {
    background: var(--bg-card);
    border-left: 3px solid var(--accent);
    padding: var(--space-md) var(--space-lg);
    margin: var(--space-lg) 0;
    border-radius: 0 8px 8px 0;
}

/* Quote */
.quote {
    border-left: 3px solid var(--accent);
    padding-left: var(--space-lg);
    margin: var(--space-xl) 0;
}

.quote p {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-style: italic;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.quote cite {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-style: normal;
}

/* Boxes */
.reasons-box,
.methods-box,
.encouragement-box,
.email-template,
.highlight-box,
.story-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: var(--space-xl);
    margin: var(--space-xl) 0;
}

.reasons-box h4,
.methods-box h4,
.encouragement-box h4,
.email-template h4,
.highlight-box h4,
.story-box h4 {
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
    margin-bottom: var(--space-md);
}

.reasons-box ol,
.methods-box ol {
    margin-bottom: 0;
}

/* Methods */
.method {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.method-label {
    font-weight: 600;
    color: var(--text-primary);
}

.method-note {
    color: var(--text-muted);
    font-style: italic;
    margin-top: var(--space-md);
    margin-bottom: 0;
}

/* Email Template */
.template-content {
    background: var(--bg-tertiary);
    padding: var(--space-lg);
    border-radius: 8px;
    font-size: 0.9375rem;
}

.template-content p {
    margin-bottom: var(--space-md);
}

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

.template-note {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-style: italic;
}

/* Classes Grid */
.classes-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    margin: var(--space-xl) 0;
}

.class-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--bg-card);
    border-radius: 8px;
    border: 1px solid var(--border);
}

.class-status {
    font-size: 1.125rem;
    flex-shrink: 0;
}

.class-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.class-info strong {
    color: var(--text-primary);
}

.class-info span {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* People List */
.people-list {
    line-height: 2;
}

.people-list a {
    white-space: nowrap;
}

/* Coming Soon */
.coming-soon {
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
    padding: var(--space-xl);
}

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

/* Scroll animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    :root {
        --space-xl: 1.5rem;
        --space-2xl: 2rem;
        --space-3xl: 3rem;
        --space-4xl: 4rem;
    }
    
    .nav {
        padding: var(--space-md) var(--space-lg);
    }
    
    .nav-links {
        gap: var(--space-lg);
    }
    
    .hero-image-container {
        width: 140px;
        height: 140px;
    }
    
    .hero-links {
        gap: var(--space-sm);
    }
    
    .social-link {
        padding: var(--space-sm) var(--space-md);
        font-size: 0.8125rem;
    }
    
    .contributions {
        padding: var(--space-lg);
    }
    
    .post-section h2 {
        font-size: 1.5rem;
    }
    
    .post-section h3 {
        font-size: 1.125rem;
    }
}

@media (max-width: 480px) {
    .nav-logo {
        font-size: 1.25rem;
    }
    
    .nav-link {
        font-size: 0.8125rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-content {
        padding: 0 var(--space-lg);
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .nav,
    .ambient-bg {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    a {
        color: black;
        text-decoration: underline;
    }
}