:root {
    --bg-primary: #0a0a0b;
    --bg-secondary: #111113;
    --bg-tertiary: #18181b;
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --accent: #f59e0b;
    --accent-dim: rgba(245, 158, 11, 0.15);
    --border: #27272a;
    --border-light: #3f3f46;
    --font-mono: 'Space Mono', monospace;
    --font-serif: 'Instrument Serif', serif;
    --font-sans: 'DM Sans', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
    overflow-x: hidden;
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1.5rem 0;
    background: rgba(10, 10, 11, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s ease;
}

nav.scrolled {
    border-bottom-color: var(--border);
}

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

.logo {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--text-primary);
    text-decoration: none;
}

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

.nav-links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav-links a {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    transition: color 0.2s ease;
}

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

.nav-links a.nav-highlight {
    color: var(--accent);
}

.nav-links a.nav-highlight:hover {
    color: var(--text-primary);
}

/* Hamburger Menu */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 101;
}

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

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

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

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

/* Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 8rem 0 4rem;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content {
    position: relative;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent);
    margin-bottom: 1.5rem;
    padding: 0.5rem 1rem;
    background: var(--accent-dim);
    border-radius: 2px;
}

.hero-tag::before {
    content: '';
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
    animation: pulse 2s ease infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 400;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.hero h1 em {
    font-style: italic;
    color: var(--accent);
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 1rem 2rem;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 1px solid;
}

.btn-primary {
    background: var(--text-primary);
    color: var(--bg-primary);
    border-color: var(--text-primary);
}

.btn-primary:hover {
    background: var(--accent);
    border-color: var(--accent);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--border-light);
}

.btn-secondary:hover {
    border-color: var(--text-primary);
}

/* Hero Visual */
.hero-visual {
    position: relative;
    aspect-ratio: 4/5;
}

.hero-visual-frame {
    position: absolute;
    inset: 0;
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    overflow: hidden;
}

.hero-visual-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.hero-visual-frame::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        linear-gradient(135deg, transparent 40%, var(--accent-dim) 100%),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 1px,
            rgba(255,255,255,0.02) 1px,
            rgba(255,255,255,0.02) 2px
        );
}

.hero-stats {
    position: absolute;
    bottom: 2rem;
    left: 2rem;
    right: 2rem;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.stat {
    padding: 1rem;
    background: rgba(10, 10, 11, 0.9);
    border: 1px solid var(--border);
    backdrop-filter: blur(10px);
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    display: block;
}

.stat-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Section Common */
section {
    padding: 8rem 0;
}

.section-header {
    margin-bottom: 4rem;
}

.section-number {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    display: block;
    margin-bottom: 1rem;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 400;
    line-height: 1.2;
}

/* Expertise Section */
.expertise {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2px;
    background: var(--border);
}

.expertise-card {
    background: var(--bg-secondary);
    padding: 3rem;
    position: relative;
    transition: background 0.3s ease;
}

.expertise-card:hover {
    background: var(--bg-tertiary);
}

.expertise-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-light);
    margin-bottom: 1.5rem;
    font-size: 1.25rem;
}

.expertise-card h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 1rem;
}

.expertise-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.expertise-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.35rem 0.75rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    color: var(--text-muted);
}

/* Parcours Section */
.parcours {
    position: relative;
}

.timeline {
    position: relative;
    padding-left: 3rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--border);
}

.timeline-item {
    position: relative;
    padding-bottom: 4rem;
}

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

.timeline-item::before {
    content: '';
    position: absolute;
    left: -3rem;
    top: 0.5rem;
    width: 9px;
    height: 9px;
    background: var(--bg-primary);
    border: 2px solid var(--border-light);
    transform: translateX(-50%) rotate(45deg);
    transition: all 0.3s ease;
}

.timeline-item.active::before,
.timeline-item:hover::before {
    background: var(--accent);
    border-color: var(--accent);
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 0.75rem;
}

.timeline-title {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
}

.timeline-company {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.timeline-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    max-width: 600px;
    line-height: 1.7;
}

/* Tech Stack */
.tech-section {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--border);
}

.tech-category {
    background: var(--bg-secondary);
    padding: 2.5rem;
}

.tech-category h4 {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent);
    margin-bottom: 1.5rem;
}

.tech-list {
    list-style: none;
}

.tech-list li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
}

.tech-list li:last-child {
    border-bottom: none;
}

/* References */
.references {
    padding: 6rem 0;
}

.references-header {
    text-align: center;
    margin-bottom: 4rem;
}

.references-header p {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 1rem auto 0;
}

.references-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 3rem;
}

.reference-item {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    padding: 1.5rem 2.5rem;
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

.reference-item:hover {
    color: var(--text-primary);
    border-color: var(--border-light);
}

/* Contact */
.contact {
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-content h2 {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 400;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.contact-content h2 em {
    font-style: italic;
    color: var(--accent);
}

.contact-content p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 450px;
    margin-bottom: 2rem;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    text-decoration: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    padding: 1.25rem 1.5rem;
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

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

.contact-link span:first-child {
    width: 24px;
    text-align: center;
}

.contact-info {
    padding: 3rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
}

.contact-info h3 {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--accent);
    margin-bottom: 2rem;
}

.info-item {
    margin-bottom: 2rem;
}

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

.info-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
}

.info-value {
    font-size: 1rem;
    color: var(--text-primary);
}

/* Footer */
footer {
    padding: 2rem 0;
    border-top: 1px solid var(--border);
}

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

footer p {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    text-decoration: none;
    letter-spacing: 0.05em;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--text-primary);
}

/* Responsive */
@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .hero-visual {
        max-width: 500px;
        margin: 0 auto;
    }

    .expertise-grid {
        grid-template-columns: 1fr;
    }

    .tech-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }
}

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

    .nav-links {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--bg-primary);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2.5rem;
        z-index: 100;
        padding: 2rem;
    }

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

    .nav-links li {
        list-style: none;
    }

    .nav-links a {
        font-size: 1.1rem;
        letter-spacing: 0.15em;
    }

    .article-card {
        flex-direction: column;
    }

    .article-card-thumb {
        width: 100%;
        height: 120px;
        order: -1;
    }

    .article-card-thumb::before {
        background: linear-gradient(to top, var(--bg-secondary) 0%, transparent 50%);
    }

    .article-card-body {
        padding: 1.5rem;
    }

    .hero-stats {
        grid-template-columns: 1fr;
        position: relative;
        bottom: auto;
        left: auto;
        right: auto;
        margin-top: 2rem;
    }

    .tech-grid {
        grid-template-columns: 1fr;
    }

    .timeline {
        padding-left: 2rem;
    }

    .timeline-item::before {
        left: -2rem;
    }

    footer .container {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

/* Animations */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.stagger-1 { transition-delay: 0.1s; }
.stagger-2 { transition-delay: 0.2s; }
.stagger-3 { transition-delay: 0.3s; }
.stagger-4 { transition-delay: 0.4s; }

/* Articles Listing */
.articles-listing {
    padding-top: 10rem;
}

.articles-grid {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.article-card {
    display: flex;
    align-items: stretch;
    text-decoration: none;
    color: var(--text-primary);
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    transition: all 0.3s ease;
    overflow: hidden;
    position: relative;
}

.article-card-body {
    flex: 1;
    padding: 2.5rem;
    position: relative;
    z-index: 1;
}

.article-card-thumb {
    width: 280px;
    flex-shrink: 0;
    background-size: cover;
    background-position: center;
    position: relative;
    transition: transform 0.5s ease;
}

.article-card-thumb::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to right, var(--bg-secondary) 0%, transparent 40%);
    z-index: 1;
}

.article-card-thumb::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--accent);
    opacity: 0;
    mix-blend-mode: color;
    transition: opacity 0.4s ease;
    z-index: 2;
}

.article-card:hover .article-card-thumb {
    transform: scale(1.05);
}

.article-card:hover .article-card-thumb::after {
    opacity: 0.3;
}

.article-card:hover {
    border-color: var(--border-light);
}

.article-card:hover .article-card-link {
    letter-spacing: 0.15em;
}

.article-card-date {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    display: block;
    margin-bottom: 0.75rem;
}

.article-card-title {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 0.75rem;
}

.article-card-excerpt {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    max-width: 700px;
    margin-bottom: 1rem;
}

.article-card-link {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.articles-empty {
    color: var(--text-muted);
    font-size: 1rem;
    padding: 3rem 0;
}

/* Article Page */
.article-page {
    padding-top: 10rem;
    padding-bottom: 6rem;
}

.article-header {
    margin-bottom: 4rem;
}

.article-header-image {
    width: 100%;
    max-height: 450px;
    object-fit: cover;
    border-radius: 2px;
    margin-bottom: 2rem;
}

.article-back {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    display: inline-block;
    margin-bottom: 2rem;
    transition: color 0.2s ease;
}

.article-back:hover {
    color: var(--text-primary);
}

.article-description {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 700px;
    margin-top: 1.5rem;
    line-height: 1.7;
}

/* Prose (article content) */
.prose {
    max-width: 700px;
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.prose h2 {
    font-family: var(--font-serif);
    font-size: 1.75rem;
    font-weight: 400;
    color: var(--text-primary);
    margin: 3rem 0 1rem;
}

.prose h3 {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    font-weight: 400;
    color: var(--text-primary);
    margin: 2.5rem 0 0.75rem;
}

.prose p {
    margin-bottom: 1.5rem;
}

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

.prose ul,
.prose ol {
    padding-left: 1.5rem;
    margin-bottom: 1.5rem;
}

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

.prose code {
    font-family: var(--font-mono);
    font-size: 0.85em;
    background: var(--bg-tertiary);
    padding: 0.2em 0.4em;
    border-radius: 2px;
}

.prose pre {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    padding: 1.5rem;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

.prose pre code {
    background: none;
    padding: 0;
}

.prose blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 1.5rem;
    margin: 2rem 0;
    color: var(--text-muted);
    font-style: italic;
}

.prose img {
    max-width: 100%;
    height: auto;
    margin: 2.5rem 0;
    border: 1px solid var(--border);
    border-radius: 2px;
    transition: border-color 0.3s ease;
}

.prose img:hover {
    border-color: var(--border-light);
}

.prose figure {
    margin: 2.5rem 0;
}

.prose figure img {
    margin: 0 0 0.75rem 0;
}

.prose figcaption {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    text-align: center;
}