@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500&display=swap');

/* ============================================
   VARIABLES
   ============================================ */
:root {
    --color-bg: #0a0a0a;
    --color-bg-secondary: #111111;
    --color-bg-elevated: #1a1a1a;
    --color-text: #ffffff;
    --color-text-secondary: #a3a3a3;
    --color-text-tertiary: #737373;
    --color-border: #262626;
    --color-accent: #a855f7;
    --color-accent-hover: #c084fc;
    --color-accent-dark: #7c3aed;
    --max-width: 900px;
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   RESET & BASE
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

::selection {
    background-color: var(--color-accent);
    color: white;
}

/* ============================================
   CONTAINER
   ============================================ */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
    position: sticky;
    top: 0;
    background-color: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    padding: 1.5rem 0;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    transition: var(--transition);
}

.nav-toggle:hover {
    opacity: 0.7;
}

.nav-toggle span {
    width: 22px;
    height: 2px;
    background-color: var(--color-text);
    transition: var(--transition);
    border-radius: 2px;
}

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

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

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

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 0;
}

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

.nav-link:focus {
    outline: none;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-accent);
    border-radius: 2px;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        width: 0;
        opacity: 0;
    }
    to {
        width: 100%;
        opacity: 1;
    }
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    padding: 8rem 0 6rem;
}

.hero-content {
    display: flex;
    gap: 3rem;
    align-items: center;
}

.hero-photo {
    flex-shrink: 0;
}

.hero-photo img {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--color-accent);
    box-shadow: 0 0 0 4px rgba(168, 85, 247, 0.1);
    transition: var(--transition);
}

.hero-photo img:hover {
    transform: scale(1.05);
    box-shadow: 0 0 0 6px rgba(168, 85, 247, 0.15);
}

.hero-text {
    flex: 1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.hero-role {
    font-size: 1.5rem;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.hero-company {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
    font-family: 'JetBrains Mono', monospace;
}

.hero-description {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: 2.5rem;
    max-width: 700px;
}

.hero-affiliations {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2.5rem;
}

.affiliation {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: var(--transition);
}

.affiliation:hover {
    border-color: var(--color-accent);
    background-color: rgba(168, 85, 247, 0.05);
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
    padding: 6rem 0;
    border-top: 1px solid var(--color-border);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    letter-spacing: -0.01em;
}

.section-description {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    margin-bottom: 3rem;
    max-width: 700px;
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about-content {
    font-size: 1.1rem;
    line-height: 1.9;
    color: var(--color-text-secondary);
    margin-bottom: 4rem;
}

.about-content p {
    margin-bottom: 1.5rem;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin-top: 3rem;
}

.skill-item {
    padding: 1.5rem;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: var(--transition);
}

.skill-item:hover {
    border-color: var(--color-accent);
    background-color: rgba(168, 85, 247, 0.05);
    transform: translateY(-2px);
}

.skill-name {
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.skill-description {
    font-size: 0.9rem;
    color: var(--color-text-tertiary);
    font-family: 'JetBrains Mono', monospace;
}

/* ============================================
   EXPERIENCE TIMELINE
   ============================================ */
.timeline {
    position: relative;
    margin-top: 3rem;
}

.timeline-item {
    position: relative;
    padding-left: 2.5rem;
    padding-bottom: 4rem;
    border-left: 2px solid var(--color-border);
}

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

.timeline-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 8px;
    width: 10px;
    height: 10px;
    background-color: var(--color-accent);
    border-radius: 50%;
    box-shadow: 0 0 0 4px rgba(168, 85, 247, 0.2);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.timeline-role {
    font-weight: 700;
    font-size: 1.35rem;
    letter-spacing: -0.01em;
}

.timeline-date {
    font-size: 0.9rem;
    color: var(--color-text-tertiary);
    font-family: 'JetBrains Mono', monospace;
}

.timeline-company {
    font-size: 1.05rem;
    color: var(--color-accent);
    margin-bottom: 1rem;
    font-weight: 500;
}

.timeline-description {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.timeline-highlights {
    list-style: none;
    padding-left: 0;
    margin-top: 1rem;
}

.timeline-highlights li {
    margin-bottom: 0.75rem;
    padding-left: 1.5rem;
    position: relative;
    color: var(--color-text-secondary);
}

.timeline-highlights li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: 700;
}

/* ============================================
   BUSINESS GRID
   ============================================ */
.business-grid {
    display: grid;
    gap: 1.5rem;
    margin-top: 3rem;
}

.business-card {
    display: flex;
    gap: 2.5rem;
    padding: 2.5rem;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: var(--transition);
    align-items: flex-start;
}

.business-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    will-change: transform;
}

.business-badge {
    flex-shrink: 0;
    width: 140px;
    height: 140px;
    border-radius: 8px;
    overflow: hidden;
    border: 3px solid var(--color-border);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    background: var(--color-bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: var(--transition);
}

.business-badge::before {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 8px;
    padding: 3px;
    background: linear-gradient(135deg, var(--color-accent-dark), var(--color-accent));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0.5;
    pointer-events: none;
    transition: var(--transition);
}

.business-badge img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: var(--transition);
}

.business-card:hover .business-badge {
    box-shadow: 0 8px 24px rgba(168, 85, 247, 0.3);
}

.business-card:hover .business-badge::before {
    opacity: 0.8;
}

.business-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.business-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
    gap: 1rem;
}

.business-title {
    font-weight: 700;
    font-size: 1.35rem;
    letter-spacing: -0.01em;
}

.business-category {
    font-size: 0.8rem;
    color: var(--color-accent);
    padding: 0.4rem 0.9rem;
    background-color: rgba(168, 85, 247, 0.15);
    border: 1px solid rgba(168, 85, 247, 0.3);
    border-radius: 6px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.business-description {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.business-metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
    padding: 1.5rem;
    background-color: rgba(168, 85, 247, 0.05);
    border-radius: 12px;
    border: 1px solid rgba(168, 85, 247, 0.1);
}

.metric {
    text-align: center;
}

.metric-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-accent);
    letter-spacing: -0.02em;
}

.metric-label {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.25rem;
}

.business-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-top: 1.5rem;
}

.tag {
    font-size: 0.8rem;
    padding: 0.4rem 0.9rem;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    color: var(--color-text-secondary);
    font-family: 'JetBrains Mono', monospace;
    font-weight: 500;
    transition: var(--transition);
}

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

/* ============================================
   PROJECTS GRID
   ============================================ */
.projects-grid {
    display: grid;
    gap: 1.5rem;
    margin-top: 3rem;
}

.project-card {
    padding: 2rem;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: var(--transition);
}

.project-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    will-change: transform;
}

.project-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.project-description {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 1.5rem;
}

.project-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
}

.project-link {
    font-size: 0.9rem;
    color: var(--color-accent);
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
}

.project-link:hover {
    color: var(--color-accent-hover);
    gap: 0.6rem;
}

/* ============================================
   BLOG GRID
   ============================================ */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}

.blog-card {
    padding: 2rem;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: var(--transition);
    cursor: pointer;
}

.blog-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    will-change: transform;
}

.blog-meta {
    display: flex;
    gap: 0.75rem;
    font-size: 0.85rem;
    color: var(--color-text-tertiary);
    margin-bottom: 1rem;
    font-family: 'JetBrains Mono', monospace;
}

.blog-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--color-text);
    letter-spacing: -0.01em;
    line-height: 1.3;
}

.blog-excerpt {
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 1.25rem;
}

.blog-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    margin-bottom: 1rem;
}

.read-more {
    color: var(--color-accent);
    font-size: 0.9rem;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin-top: 0.5rem;
}

.read-more:hover {
    gap: 0.6rem;
}

/* ============================================
   BOOKS SECTION
   ============================================ */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.book-card {
    display: flex;
    gap: 1.5rem;
    padding: 2rem;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: var(--transition);
}

.book-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    will-change: transform;
}

.book-cover {
    flex-shrink: 0;
    width: 120px;
    height: 180px;
    border-radius: 8px;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-accent-dark), var(--color-accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}

.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.book-info {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.book-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-text);
    line-height: 1.3;
}

.book-author {
    font-size: 0.95rem;
    color: var(--color-accent);
    margin-bottom: 1rem;
    font-style: italic;
}

.book-summary {
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

.book-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1rem;
    padding: 0.75rem 1.25rem;
    background-color: rgba(168, 85, 247, 0.15);
    border: 1px solid var(--color-accent);
    border-radius: 8px;
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    transition: var(--transition);
    cursor: pointer;
}

.book-link:hover {
    background-color: rgba(168, 85, 247, 0.25);
    transform: translateX(4px);
}

.book-link:active {
    transform: translateX(2px);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1rem;
    margin-top: 3rem;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: var(--transition);
}

.contact-link:hover {
    border-color: var(--color-accent);
    background-color: rgba(168, 85, 247, 0.05);
    transform: translateX(4px);
}

.contact-icon {
    font-size: 1.5rem;
}

.contact-label {
    font-weight: 500;
    font-size: 1rem;
    color: var(--color-text);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    padding: 4rem 0 3rem;
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: 0.9rem;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .container {
        padding: 0 1.25rem;
    }

    .nav-container {
        padding: 0 1.25rem;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: rgba(10, 10, 10, 0.95);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        padding: 1.25rem;
        gap: 0.75rem;
        display: none;
    }

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

    .nav-link.active::after {
        display: none;
    }

    .hero {
        padding: 4rem 0 3rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-role {
        font-size: 1.25rem;
    }

    .hero-description {
        font-size: 1.05rem;
    }

    .section {
        padding: 3.5rem 0;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .timeline-header {
        flex-direction: column;
        gap: 0.5rem;
    }

    .skills-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

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

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

    .book-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 1.5rem;
    }

    .book-card:hover {
        transform: translateY(-4px);
    }

    .book-cover {
        width: 140px;
        height: 210px;
        margin-bottom: 1rem;
    }

    .book-link {
        width: 100%;
        justify-content: center;
    }

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

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

    .business-card {
        flex-direction: column;
        align-items: center;
        padding: 1.5rem;
    }

    .business-badge {
        width: 120px;
        height: 120px;
        margin-bottom: 1.5rem;
    }

    .business-content {
        text-align: center;
    }

    .business-header {
        flex-direction: column;
        align-items: center;
        gap: 0.75rem;
    }

    .project-card,
    .blog-card {
        padding: 1.5rem;
    }

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

    .hero-photo img {
        width: 150px;
        height: 150px;
        border: 2px solid var(--color-accent);
        box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.1);
    }

    .hero-photo img:hover {
        transform: scale(1.03);
    }

    .hero-company {
        font-size: 1rem;
    }

    .hero-affiliations {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .nav-container {
        padding: 0 1rem;
    }

    .hero {
        padding: 3rem 0 2.5rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-role {
        font-size: 1.1rem;
    }

    .section {
        padding: 3rem 0;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .business-metrics {
        grid-template-columns: 1fr;
    }

    .business-card {
        padding: 1.25rem;
    }

    .business-badge {
        width: 110px;
        height: 110px;
    }

    .project-card,
    .blog-card,
    .book-card,
    .skill-item,
    .contact-link {
        padding: 1.25rem;
    }

    .book-cover {
        width: 120px;
        height: 180px;
        margin-bottom: 1rem;
    }

    .book-title {
        font-size: 1.1rem;
    }

    .book-author {
        font-size: 0.85rem;
    }

    .book-summary {
        font-size: 0.9rem;
    }

    .book-link {
        font-size: 0.85rem;
        padding: 0.6rem 1rem;
        width: 100%;
        justify-content: center;
    }

    .hero-photo img {
        width: 120px;
        height: 120px;
        border: 2px solid var(--color-accent);
        box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.1);
    }

    .hero-photo img:hover {
        transform: scale(1.02);
    }

    .hero-role {
        font-size: 1.2rem;
    }

    .hero-company {
        font-size: 0.9rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .affiliation {
        padding: 0.6rem 1rem;
        font-size: 0.8rem;
    }

    .nav-toggle {
        padding: 0.4rem;
    }

    .nav-toggle span {
        width: 20px;
    }
}

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

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}