/* ==========================================================================
   Martin Legrand Portfolio - Shared Styles
   Professional East Asian-inspired minimalism
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables & Theme
   -------------------------------------------------------------------------- */
:root {
    /* Color palette - refined warm cream theme */
    --bg-primary: #f5f2e8;
    --bg-secondary: #faf8f3;
    --bg-card: rgba(255, 255, 255, 0.7);
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --text-muted: #6b6b6b;
    --accent: #2c2c2c;
    --border: rgba(0, 0, 0, 0.06);
    --border-hover: rgba(0, 0, 0, 0.12);
    --shadow: rgba(0, 0, 0, 0.04);
    --shadow-hover: rgba(0, 0, 0, 0.08);
    
    /* Typography */
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Spacing scale - generous whitespace */
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    
    /* Layout */
    --max-width: 880px;
    --radius: 6px;
    --radius-lg: 10px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s ease;
}

/* --------------------------------------------------------------------------
   Base & Reset
   -------------------------------------------------------------------------- */
*, *::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-mono);
    font-weight: 300;
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-primary);
    letter-spacing: 0.01em;
    overflow-x: hidden;
}

/* Selection */
::selection {
    background: rgba(0, 0, 0, 0.08);
    color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4 {
    font-weight: 400;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
h2 { font-size: 1.25rem; letter-spacing: -0.01em; }
h3 { font-size: 1.1rem; }
h4 { font-size: 0.95rem; }

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

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

a:hover {
    opacity: 0.7;
}

/* --------------------------------------------------------------------------
   Layout Container
   -------------------------------------------------------------------------- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-3xl) var(--space-xl);
}

@media (max-width: 640px) {
    .container {
        padding: var(--space-2xl) var(--space-lg);
    }
}

/* --------------------------------------------------------------------------
   Header Section
   -------------------------------------------------------------------------- */
.site-header {
    margin-bottom: var(--space-3xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--border);
}

.site-title {
    font-size: 2.75rem;
    font-weight: 300;
    margin-bottom: var(--space-md);
    letter-spacing: -0.03em;
    position: relative;
    display: inline-block;
}

.site-title::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--text-primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform var(--transition-slow);
}

.site-title:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.site-subtitle {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 300;
    line-height: 1.8;
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.site-nav {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-radius: var(--radius);
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-card);
    opacity: 1;
}

.nav-link.active {
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border);
}

.nav-link[href^="http"]::after {
    content: '↗';
    margin-left: 0.3em;
    font-size: 0.8em;
    opacity: 0.5;
}

/* --------------------------------------------------------------------------
   Main Navigation Banner (for index page)
   -------------------------------------------------------------------------- */
.nav-banner {
    display: flex;
    gap: var(--space-md);
    margin: var(--space-xl) 0 var(--space-2xl);
}

.nav-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-lg);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--text-primary);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.nav-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, transparent 0%, rgba(0,0,0,0.02) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.nav-btn:hover {
    transform: translateY(-2px);
    border-color: var(--border-hover);
    box-shadow: 0 8px 24px var(--shadow-hover);
    opacity: 1;
}

.nav-btn:hover::before {
    opacity: 1;
}

@media (max-width: 640px) {
    .nav-banner {
        flex-direction: column;
    }
}

/* --------------------------------------------------------------------------
   Section Styles
   -------------------------------------------------------------------------- */
.section {
    margin-bottom: var(--space-3xl);
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
}

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

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

.section-header {
    margin-bottom: var(--space-xl);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.section-title {
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
}

.section-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 300;
}

/* --------------------------------------------------------------------------
   Cards & Items
   -------------------------------------------------------------------------- */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    margin-bottom: var(--space-lg);
    transition: all var(--transition-base);
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, rgba(255,255,255,0.5) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.card:hover {
    border-color: var(--border-hover);
    box-shadow: 0 4px 20px var(--shadow);
    transform: translateY(-1px);
}

.card:hover::before {
    opacity: 1;
}

.card-link {
    display: block;
}

.card-link:hover {
    opacity: 1;
}

.card-title {
    font-size: 1.05rem;
    font-weight: 400;
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.card-title::after {
    content: '→';
    opacity: 0;
    transform: translateX(-4px);
    transition: all var(--transition-fast);
    font-size: 0.9em;
}

.card:hover .card-title::after {
    opacity: 0.5;
    transform: translateX(0);
}

.card-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.card-description {
    font-size: 0.875rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Experience / Timeline Items
   -------------------------------------------------------------------------- */
.timeline-item {
    position: relative;
    padding-left: var(--space-xl);
    padding-bottom: var(--space-xl);
    border-left: 1px solid var(--border);
    margin-bottom: var(--space-lg);
    transition: border-color var(--transition-base);
}

.timeline-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -3px;
    top: 6px;
    width: 5px;
    height: 5px;
    background: var(--bg-primary);
    border: 1px solid var(--text-muted);
    border-radius: 50%;
    transition: all var(--transition-base);
}

.timeline-item:hover {
    border-left-color: var(--border-hover);
}

.timeline-item:hover::before {
    background: var(--text-primary);
    border-color: var(--text-primary);
}

.timeline-title {
    font-size: 1rem;
    font-weight: 400;
    margin-bottom: var(--space-xs);
}

.timeline-org {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.timeline-period {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.timeline-desc {
    font-size: 0.875rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   Grid Layouts
   -------------------------------------------------------------------------- */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

@media (max-width: 768px) {
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
}

/* --------------------------------------------------------------------------
   Tags & Labels
   -------------------------------------------------------------------------- */
.tag {
    display: inline-flex;
    align-items: center;
    padding: 0.2em 0.6em;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-right: var(--space-xs);
    margin-bottom: var(--space-xs);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
    margin-top: var(--space-4xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-text {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: var(--space-md);
}

.footer-links a {
    font-size: 0.8rem;
    color: var(--text-muted);
}

@media (max-width: 640px) {
    .site-footer {
        flex-direction: column;
        text-align: center;
    }
}

/* --------------------------------------------------------------------------
   Research / Paper Specific Styles
   -------------------------------------------------------------------------- */
.paper-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    margin-bottom: var(--space-lg);
    transition: all var(--transition-base);
}

.paper-card:hover {
    border-color: var(--border-hover);
    box-shadow: 0 6px 28px var(--shadow-hover);
    transform: translateY(-2px);
}

.paper-title {
    font-size: 1.15rem;
    font-weight: 400;
    line-height: 1.4;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.paper-authors {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

.paper-abstract {
    font-size: 0.9rem;
    line-height: 1.75;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
}

.paper-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.paper-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25em 0.7em;
    background: var(--text-primary);
    color: var(--bg-primary);
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* --------------------------------------------------------------------------
   Blog Specific Styles
   -------------------------------------------------------------------------- */
.post-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.post-preview {
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border);
    transition: all var(--transition-base);
}

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

.post-preview:hover {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    margin: 0 calc(-1 * var(--space-lg));
    padding: var(--space-lg);
}

.post-title {
    font-size: 1.1rem;
    font-weight: 400;
    margin-bottom: var(--space-xs);
}

.post-title a {
    background: linear-gradient(to right, var(--text-primary) 0%, var(--text-primary) 100%);
    background-size: 0 1px;
    background-position: 0 100%;
    background-repeat: no-repeat;
    transition: background-size var(--transition-base);
}

.post-title a:hover {
    opacity: 1;
    background-size: 100% 1px;
}

.post-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
}

.post-excerpt {
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* Article page */
.article-header {
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-xl);
    border-bottom: 1px solid var(--border);
}

.article-title {
    font-size: 1.6rem;
    font-weight: 400;
    line-height: 1.4;
    margin-bottom: var(--space-md);
}

.article-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.article-content {
    font-size: 0.95rem;
    line-height: 1.9;
}

.article-content p {
    margin-bottom: var(--space-lg);
}

.article-content ol, 
.article-content ul {
    margin-left: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.article-content li {
    margin-bottom: var(--space-md);
    padding-left: var(--space-xs);
}

.article-content li::marker {
    color: var(--text-muted);
}

.article-content strong {
    font-weight: 500;
    color: var(--text-primary);
}

/* --------------------------------------------------------------------------
   Special Effects (keeping the "coolness")
   -------------------------------------------------------------------------- */

/* Subtle grain overlay */
.grain-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.015;
    z-index: 1000;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* Scanline effect - very subtle */
.scanlines::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 0, 0, 0.01) 2px,
        rgba(0, 0, 0, 0.01) 4px
    );
    pointer-events: none;
    z-index: 999;
    opacity: 0.5;
}

/* Glitch effect - refined */
.glitch {
    position: relative;
}

.glitch::before,
.glitch::after {
    content: attr(data-text);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
}

.glitch::before {
    animation: glitch-1 8s infinite;
    color: var(--text-muted);
    z-index: -1;
}

.glitch::after {
    animation: glitch-2 8s infinite;
    color: var(--text-muted);
    z-index: -2;
    opacity: 0;
}

@keyframes glitch-1 {
    0%, 96%, 100% {
        transform: translate(0);
        opacity: 0;
    }
    97%, 98% {
        transform: translate(-1px, 1px);
        opacity: 0.3;
    }
}

@keyframes glitch-2 {
    0%, 94%, 100% {
        transform: translate(0);
        opacity: 0;
    }
    95%, 96% {
        transform: translate(1px, -1px);
        opacity: 0.2;
    }
}

/* Back to top button */
.back-to-top {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 40px;
    height: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 100;
    font-size: 1.2rem;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-2px);
    border-color: var(--border-hover);
    box-shadow: 0 4px 12px var(--shadow);
}

/* --------------------------------------------------------------------------
   Print Styles
   -------------------------------------------------------------------------- */
@media print {
    .site-nav,
    .nav-banner,
    .back-to-top,
    .grain-overlay,
    .scanlines::after {
        display: none !important;
    }
    
    body {
        background: white;
        font-size: 12pt;
    }
    
    .card, .paper-card {
        break-inside: avoid;
        border: 1px solid #ddd;
    }
}