/* ============================================
   Arjun Garg - Personal Website
   Academic/Paper Aesthetic
   ============================================ */

/* CSS Custom Properties */
:root {
    /* Colors - Warm, paper-like */
    --color-bg: #FFFEF8;
    --color-bg-alt: #FAF9F6;
    --color-text: #1C1917;
    --color-text-secondary: #57534E;
    --color-text-muted: #78716C;
    --color-accent: #B45309;
    --color-accent-hover: #92400E;
    --color-border: #E7E5E4;
    
    /* Typography */
    --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', Consolas, monospace;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    
    /* Layout - Narrower for readability */
    --max-width: 600px;
    --nav-height: 60px;
}

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

html {
    font-size: 17px;
}

body {
    font-family: var(--font-serif);
    font-size: 1rem;
    line-height: 1.75;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
    width: 100%;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3 {
    font-family: var(--font-serif);
    font-weight: 600;
    line-height: 1.35;
    color: var(--color-text);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.25rem; }
h3 { font-size: 1.1rem; }

p {
    color: var(--color-text-secondary);
}

a {
    color: var(--color-accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
    transition: color 0.15s ease;
}

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

/* ============================================
   Navigation
   ============================================ */
.site-nav {
    position: sticky;
    top: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    height: var(--nav-height);
}

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

.nav-logo {
    font-family: var(--font-serif);
    font-weight: 600;
    font-size: 1rem;
    color: var(--color-text);
    text-decoration: none;
    white-space: nowrap;
}

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

.nav-links {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: flex-end;
}

.nav-links a {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    text-decoration: none;
}

.nav-links a:hover,
.nav-links a.current {
    color: var(--color-text);
}

/* ============================================
   Hero Section (Home Page)
   ============================================ */
.hero {
    padding: var(--space-2xl) 0 var(--space-xl);
}

.hero-name {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.hero-tagline {
    font-size: 1.25rem;
    color: var(--color-text);
    font-weight: 400;
    font-style: italic;
    margin-bottom: var(--space-md);
}

.hero-intro {
    font-size: 1.0625rem;
    line-height: 1.8;
    max-width: 100%;
}

/* ============================================
   Page Header (Interior Pages)
   ============================================ */
.page-header {
    padding: var(--space-xl) 0 var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
    margin-bottom: var(--space-xs);
}

.page-subtitle {
    font-size: 1rem;
    color: var(--color-text-secondary);
    font-style: italic;
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: var(--space-xl) 0;
    flex: 1;
}

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

.section-title {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-xs);
    border-bottom: 1px solid var(--color-border);
}

/* ============================================
   Reading List
   ============================================ */
.reading-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.reading-card {
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

.reading-card:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.card-tag {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.reading-card h3 {
    font-size: 1.0625rem;
    font-weight: 600;
    margin: 4px 0;
}

.reading-card .author {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    font-style: italic;
}

.reading-card .note {
    font-size: 0.9375rem;
    margin-top: var(--space-xs);
    line-height: 1.6;
}

/* ============================================
   Work Experience
   ============================================ */
.work-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

.work-card {
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--color-border);
}

.work-card:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.work-header {
    margin-bottom: var(--space-sm);
}

.work-card h3 {
    font-size: 1.25rem;
    margin-bottom: 2px;
}

.work-role {
    font-size: 1rem;
    color: var(--color-accent);
    font-style: italic;
}

.work-period {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    display: block;
    margin-top: 4px;
}

.work-description {
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.work-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.work-tags span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.25rem 0.625rem;
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

/* ============================================
   Writing / Posts
   ============================================ */
.posts-list {
    display: flex;
    flex-direction: column;
}

.post-preview {
    border-bottom: 1px solid var(--color-border);
}

.post-preview:last-child {
    border-bottom: none;
}

.post-preview a {
    display: block;
    padding: var(--space-md) 0;
    color: inherit;
    text-decoration: none;
}

.post-preview a:hover h3 {
    color: var(--color-accent);
}

.post-preview time {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

.post-preview h3 {
    font-size: 1.125rem;
    margin: var(--space-xs) 0;
    transition: color 0.15s ease;
}

.post-preview p {
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* Single Post */
.back-link {
    display: inline-block;
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

.back-link:hover {
    color: var(--color-accent);
}

.post-title {
    font-size: 1.75rem;
    margin-bottom: var(--space-xs);
}

.post-date {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--space-2xl) var(--space-md);
    border: 1px solid var(--color-border);
}

.empty-title {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--space-sm);
}

.empty-description {
    max-width: 400px;
    margin: 0 auto;
    font-size: 1rem;
    font-style: italic;
}

/* ============================================
   Prose (Markdown Content)
   ============================================ */
.prose {
    font-size: 1.0625rem;
    line-height: 1.85;
}

.prose h1, .prose h2, .prose h3 {
    margin-top: var(--space-xl);
    margin-bottom: var(--space-sm);
}

.prose h1 { font-size: 1.5rem; }
.prose h2 { font-size: 1.25rem; }
.prose h3 { font-size: 1.1rem; }

.prose p {
    color: var(--color-text);
    margin-bottom: var(--space-md);
}

.prose a {
    text-decoration: underline;
    text-underline-offset: 2px;
}

.prose ul, .prose ol {
    margin-bottom: var(--space-md);
    padding-left: var(--space-md);
    color: var(--color-text);
}

.prose li {
    margin-bottom: var(--space-xs);
}

.prose blockquote {
    border-left: 2px solid var(--color-accent);
    padding-left: var(--space-md);
    margin: var(--space-md) 0;
    font-style: italic;
    color: var(--color-text-secondary);
}

.prose code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-bg-alt);
    padding: 0.15em 0.4em;
    border: 1px solid var(--color-border);
}

.prose pre {
    background: #1C1917;
    color: #FAF9F6;
    padding: var(--space-md);
    overflow-x: auto;
    margin: var(--space-md) 0;
    border: 1px solid var(--color-border);
}

.prose pre code {
    background: none;
    padding: 0;
    border: none;
    font-size: 0.875rem;
}

.prose hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--space-xl) 0;
}

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

.prose em {
    font-style: italic;
}

/* ============================================
   Contact Links
   ============================================ */
.contact-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: 0.5rem 0.875rem;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    font-size: 0.9375rem;
    text-decoration: none;
    transition: border-color 0.15s ease, color 0.15s ease;
}

.contact-link:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.contact-link svg {
    width: 16px;
    height: 16px;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--color-border);
    margin-top: auto;
}

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

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

/* ============================================
   Mobile Responsive
   ============================================ */
@media (max-width: 640px) {
    html {
        font-size: 16px;
    }
    
    .hero-name {
        font-size: 1.875rem;
    }
    
    .hero-tagline {
        font-size: 1.125rem;
    }
    
    .nav-container {
        flex-wrap: wrap;
        height: auto;
        padding-top: var(--space-sm);
        padding-bottom: var(--space-sm);
    }
    
    .nav-logo {
        flex-basis: 100%;
        margin-bottom: var(--space-xs);
    }
    
    .nav-links {
        flex-basis: 100%;
        justify-content: flex-start;
        gap: var(--space-sm);
    }
    
    .nav-links a {
        font-size: 0.875rem;
    }
    
    .section {
        padding: var(--space-lg) 0;
    }
    
    .work-header {
        flex-direction: column;
    }
    
    .contact-links {
        flex-direction: column;
    }
    
    .contact-link {
        justify-content: center;
    }
}

/* Ensure touch targets are large enough */
@media (pointer: coarse) {
    .nav-links a,
    .contact-link,
    .post-preview a {
        min-height: 44px;
        display: flex;
        align-items: center;
    }
}

/* ============================================
   Reduced Motion
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}