/* ===================================
   CSS Variables & Base Styles
   =================================== */

:root {
    /* Colors - Sophisticated Dark Palette */
    --color-bg: #0a0a0b;
    --color-bg-elevated: #111113;
    --color-bg-card: #18181b;
    --color-surface: #1f1f23;
    
    --color-text-primary: #fafafa;
    --color-text-secondary: #a1a1aa;
    --color-text-muted: #71717a;
    
    --color-accent: #c4a35a;
    --color-accent-light: #d4b76a;
    --color-accent-muted: rgba(196, 163, 90, 0.15);
    
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);
    
    /* Typography */
    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Outfit', -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;
    --space-5xl: 8rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Layout */
    --container-max: 1200px;
    --container-narrow: 800px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.7;
    color: var(--color-text-secondary);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

ul {
    list-style: none;
}

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

/* ===================================
   Navigation
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-lg) 0;
    transition: all var(--transition-base);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(10, 10, 11, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-md) 0;
}

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

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 500;
    color: var(--color-text-primary);
    letter-spacing: 0.05em;
    transition: color var(--transition-fast);
}

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

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

.nav-link {
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--color-text-secondary);
    letter-spacing: 0.02em;
    position: relative;
    padding: var(--space-xs) 0;
}

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

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

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

/* Mobile Navigation Toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-fast);
}

/* ===================================
   Hero Section
   =================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: var(--space-5xl) var(--space-xl);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(196, 163, 90, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(196, 163, 90, 0.05) 0%, transparent 40%),
        radial-gradient(ellipse at 50% 100%, rgba(196, 163, 90, 0.03) 0%, transparent 30%);
    pointer-events: none;
}

.hero-content {
    max-width: var(--container-narrow);
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-greeting {
    font-size: 1rem;
    font-weight: 400;
    color: var(--color-accent);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.2s;
}

.hero-name {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 5.5rem);
    font-weight: 400;
    color: var(--color-text-primary);
    line-height: 1.1;
    margin-bottom: var(--space-lg);
    letter-spacing: -0.02em;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.4s;
}

.hero-title-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.6s;
}

.hero-title {
    font-size: 1.125rem;
    font-weight: 300;
    color: var(--color-text-secondary);
    letter-spacing: 0.05em;
}

.hero-divider {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--color-accent);
    font-style: italic;
}

.hero-description {
    font-size: 1.125rem;
    font-weight: 300;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto var(--space-2xl);
    line-height: 1.8;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 0.8s;
}

.hero-cta {
    display: flex;
    gap: var(--space-lg);
    justify-content: center;
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
    animation-delay: 1s;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-xl);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    border-radius: 2px;
    transition: all var(--transition-base);
    cursor: pointer;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-bg);
    border: 1px solid var(--color-accent);
}

.btn-primary:hover {
    background: var(--color-accent-light);
    border-color: var(--color-accent-light);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-hover);
}

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

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    opacity: 0;
    animation: fadeIn 0.8s ease forwards;
    animation-delay: 1.2s;
}

.scroll-indicator span {
    font-size: 0.75rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

/* ===================================
   Section Styles
   =================================== */

section {
    padding: var(--space-5xl) 0;
}

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

.section-number {
    font-family: var(--font-display);
    font-size: 0.875rem;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    display: block;
    margin-bottom: var(--space-sm);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 400;
    color: var(--color-text-primary);
    letter-spacing: -0.01em;
}

/* ===================================
   About Section
   =================================== */

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4xl);
    align-items: start;
}

.about-intro {
    font-size: 1.25rem;
    font-weight: 400;
    color: var(--color-text-primary);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.about-text p {
    margin-bottom: var(--space-lg);
}

.about-skills {
    margin-top: var(--space-2xl);
}

.about-skills h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--space-lg);
}

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

.skill-category h4 {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: var(--space-md);
}

.skill-category ul li {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    padding: var(--space-xs) 0;
    border-bottom: 1px solid var(--color-border);
}

.about-image {
    position: sticky;
    top: 120px;
}

.image-frame {
    position: relative;
    padding: var(--space-md);
    border: 1px solid var(--color-border);
}

.image-frame::before {
    content: '';
    position: absolute;
    top: var(--space-md);
    left: var(--space-md);
    right: calc(var(--space-md) * -1);
    bottom: calc(var(--space-md) * -1);
    border: 1px solid var(--color-accent-muted);
    z-index: -1;
}

.image-placeholder {
    aspect-ratio: 4/5;
    background: linear-gradient(135deg, var(--color-bg-card) 0%, var(--color-surface) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.initials {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 400;
    color: var(--color-accent);
    opacity: 0.5;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

.stat {
    text-align: center;
    padding: var(--space-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 500;
    color: var(--color-text-primary);
    display: block;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    letter-spacing: 0.05em;
}

/* ===================================
   Education Section
   =================================== */

.education {
    background: var(--color-bg-elevated);
}

.timeline {
    position: relative;
    padding-left: var(--space-3xl);
}

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

.timeline-item {
    position: relative;
    padding-bottom: var(--space-3xl);
}

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

.timeline-marker {
    position: absolute;
    left: calc(var(--space-3xl) * -1);
    top: var(--space-xs);
    width: 9px;
    height: 9px;
    background: var(--color-bg);
    border: 2px solid var(--color-accent);
    border-radius: 50%;
    transform: translateX(-4px);
}

.timeline-date {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    display: block;
    margin-bottom: var(--space-sm);
}

.timeline-content h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.timeline-institution {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
}

.timeline-content p:last-child {
    color: var(--color-text-secondary);
}

/* ===================================
   Experience Section
   =================================== */

.experience-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
}

.experience-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    padding: var(--space-2xl);
    transition: all var(--transition-base);
}

.experience-card:hover {
    border-color: var(--color-accent-muted);
    transform: translateY(-4px);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-lg);
}

.card-duration {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.card-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-muted);
    color: var(--color-accent);
    border-radius: 2px;
}

.experience-card h3 {
    font-family: var(--font-display);
    font-size: 1.375rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--space-xs);
}

.card-company {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
}

.card-responsibilities {
    list-style: none;
}

.card-responsibilities li {
    position: relative;
    padding-left: var(--space-lg);
    margin-bottom: var(--space-sm);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

.card-responsibilities li::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* ===================================
   Projects Section
   =================================== */

.projects {
    background: var(--color-bg-elevated);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
}

.project-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    padding: var(--space-2xl);
    position: relative;
    overflow: hidden;
    transition: all var(--transition-base);
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-accent), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project-card:hover {
    border-color: var(--color-accent-muted);
    transform: translateY(-4px);
}

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

.project-card.featured {
    grid-column: span 2;
}

.project-number {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 400;
    color: var(--color-accent);
    opacity: 0.2;
    position: absolute;
    top: var(--space-lg);
    right: var(--space-xl);
    line-height: 1;
}

.project-category {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    display: block;
    margin-bottom: var(--space-sm);
}

.project-content h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--space-md);
}

.project-content p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.project-tech span {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    padding: var(--space-xs) var(--space-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
}

/* ===================================
   Research Section
   =================================== */

.research-content {
    max-width: var(--container-narrow);
}

.research-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    display: block;
    margin-bottom: var(--space-md);
}

.research-main h3 {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 400;
    color: var(--color-text-primary);
    line-height: 1.3;
    margin-bottom: var(--space-lg);
}

.research-meta {
    display: flex;
    gap: var(--space-md);
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.research-description {
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-2xl);
    border-bottom: 1px solid var(--color-border);
}

.research-description p {
    margin-bottom: var(--space-lg);
}

.research-highlights h4,
.research-methods h4 {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-primary);
    letter-spacing: 0.05em;
    margin-bottom: var(--space-lg);
}

.findings-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-2xl);
}

.finding {
    text-align: center;
    padding: var(--space-lg);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
}

.finding-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-accent);
    display: block;
    margin-bottom: var(--space-xs);
}

.finding-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.research-methods ul {
    list-style: none;
}

.research-methods li {
    position: relative;
    padding-left: var(--space-lg);
    margin-bottom: var(--space-sm);
    color: var(--color-text-secondary);
}

.research-methods li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* ===================================
   Contact Section
   =================================== */

.contact {
    background: var(--color-bg-elevated);
}

.contact-intro {
    max-width: 500px;
    margin-bottom: var(--space-2xl);
}

.contact-intro p {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.contact-card {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-xl);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.contact-card:hover {
    border-color: var(--color-accent-muted);
    transform: translateX(8px);
}

.contact-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-muted);
    color: var(--color-accent);
    flex-shrink: 0;
}

.contact-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-muted);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    display: block;
    margin-bottom: var(--space-xs);
}

.contact-value {
    font-size: 0.9rem;
    color: var(--color-text-primary);
    word-break: break-word;
}

/* ===================================
   Footer
   =================================== */

.footer {
    padding: var(--space-2xl) 0;
    border-top: 1px solid var(--color-border);
}

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

.footer-text {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-sm);
}

.footer-copyright {
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* ===================================
   Animations
   =================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes scrollPulse {
    0%, 100% {
        opacity: 1;
        transform: scaleY(1);
    }
    50% {
        opacity: 0.5;
        transform: scaleY(0.8);
    }
}

/* Scroll animations */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-3xl);
    }
    
    .about-image {
        position: relative;
        top: 0;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .skills-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .findings-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .container {
        padding: 0 var(--space-lg);
    }
    
    section {
        padding: var(--space-4xl) 0;
    }
    
    /* Mobile Navigation */
    .nav-toggle {
        display: flex;
        z-index: 1001;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: 0;
        width: 100%;
        height: 100vh;
        background: var(--color-bg);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--space-xl);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
    }
    
    .nav-menu.active {
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        font-size: 1.25rem;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    /* Hero adjustments */
    .hero {
        padding: var(--space-4xl) var(--space-lg);
    }
    
    .hero-title-wrapper {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .hero-divider {
        display: none;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
    
    /* Grid adjustments */
    .experience-grid,
    .projects-grid,
    .contact-methods {
        grid-template-columns: 1fr;
    }
    
    .project-card.featured {
        grid-column: span 1;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .about-stats {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .findings-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Timeline adjustments */
    .timeline {
        padding-left: var(--space-xl);
    }
    
    .timeline-marker {
        left: calc(var(--space-xl) * -1);
    }
}

@media (max-width: 480px) {
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .findings-grid {
        grid-template-columns: 1fr;
    }
    
    .research-meta {
        flex-direction: column;
        gap: var(--space-xs);
    }
    
    .research-meta span:nth-child(2) {
        display: none;
    }
}

/* ===================================
   Utility Classes
   =================================== */

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}