:root {
    --bg-primary: #0A0E27;
    --bg-secondary: #111633;
    --bg-tertiary: #1a1f3a;
    --text-primary: #E8EAF6;
    --text-secondary: #9AA5CE;
    --text-muted: #6B7280;
    --accent-primary: #00D9FF;
    --accent-secondary: #7C3AED;
    --accent-tertiary: #F59E0B;
    --border-color: #252B47;
    --grid-color: rgba(0, 217, 255, 0.03);

    --font-display: 'Crimson Pro', serif;
    --font-mono: 'JetBrains Mono', monospace;
    --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
}

/* Grid Overlay Effect */
.grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 0;
    opacity: 0.5;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(10, 14, 39, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s var(--transition-smooth);
}

.nav.scrolled {
    background-color: rgba(10, 14, 39, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent-primary);
    text-decoration: none;
    letter-spacing: -0.02em;
    transition: opacity 0.3s;
}

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

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

.nav-link {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent-primary);
    transition: width 0.3s var(--transition-smooth);
}

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

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 2rem 4rem;
    position: relative;
    z-index: 1;
}

.hero-container {
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.hero-prefix {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    opacity: 0;
    animation: fadeInUp 0.8s var(--transition-smooth) 0.2s forwards;
}

.terminal-prompt {
    color: var(--accent-primary);
}

.hero-label {
    color: var(--text-secondary);
}

.hero-name {
    font-family: var(--font-display);
    font-size: clamp(3.5rem, 10vw, 7rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
    opacity: 0;
    animation: fadeInUp 0.8s var(--transition-smooth) 0.4s forwards;
}

.hero-surname {
    color: var(--accent-primary);
}

.hero-title {
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 300;
    opacity: 0;
    animation: fadeInUp 0.8s var(--transition-smooth) 0.6s forwards;
}

.hero-location {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    opacity: 0;
    animation: fadeInUp 0.8s var(--transition-smooth) 0.7s forwards;
}

.location-pin {
    font-size: 1.1rem;
}

.hero-contact {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    opacity: 0;
    animation: fadeInUp 0.8s var(--transition-smooth) 0.8s forwards;
}

.contact-btn {
    padding: 0.8rem 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: transparent;
    color: var(--text-primary);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s var(--transition-smooth);
    cursor: pointer;
}

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

.contact-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 217, 255, 0.2);
}

.contact-btn.primary:hover {
    box-shadow: 0 4px 16px rgba(0, 217, 255, 0.4);
}

.btn-icon {
    font-size: 1.1rem;
}

.contact-btn svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    flex-shrink: 0;
}

.hero-decoration {
    position: absolute;
    right: 2rem;
    bottom: 2rem;
    opacity: 0;
    animation: fadeIn 0.8s var(--transition-smooth) 1s forwards;
}

.hex-code {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.1em;
}

/* Section Styles */
section {
    padding: 6rem 2rem;
    position: relative;
    z-index: 1;
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    display: flex;
    align-items: baseline;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.section-number {
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--accent-primary);
    font-weight: 600;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

/* About Section */
.about {
    background: linear-gradient(180deg, transparent 0%, var(--bg-secondary) 50%, transparent 100%);
}

.about-content {
    max-width: 900px;
}

.about-lead {
    font-family: var(--font-display);
    font-size: clamp(1.5rem, 3vw, 2rem);
    color: var(--accent-primary);
    margin-bottom: 2rem;
    font-weight: 600;
    line-height: 1.4;
}

.about-body p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.about-highlights {
    list-style: none;
    margin: 2rem 0;
    padding-left: 0;
}

.about-highlights li {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.7;
}

.about-highlights li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-weight: 600;
}

.about-expertise {
    font-size: 1.1rem;
    margin-top: 2rem;
}

.about-expertise strong {
    color: var(--accent-primary);
    font-weight: 600;
}

/* Experience Section */
.timeline {
    position: relative;
    padding-left: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--accent-primary), transparent);
}

.timeline-item {
    position: relative;
    margin-bottom: 4rem;
    padding-left: 2rem;
}

.timeline-marker {
    position: absolute;
    left: -2.5rem;
    top: 0.5rem;
    width: 12px;
    height: 12px;
    background: var(--accent-primary);
    border-radius: 50%;
    box-shadow: 0 0 0 4px var(--bg-primary), 0 0 0 6px var(--border-color);
}

.timeline-content {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: all 0.3s var(--transition-smooth);
}

.timeline-content:hover {
    border-color: var(--accent-primary);
    transform: translateX(8px);
    box-shadow: 0 8px 24px rgba(0, 217, 255, 0.1);
}

.exp-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    gap: 2rem;
}

.exp-company {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--text-primary);
    font-weight: 700;
    margin-bottom: 0.3rem;
}

.exp-title {
    font-size: 1rem;
    color: var(--accent-primary);
    font-weight: 500;
}

.exp-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    text-align: right;
}

.exp-date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

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

.exp-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.exp-label {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent-primary);
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.exp-achievements {
    list-style: none;
    margin: 1rem 0;
    padding-left: 0;
}

.exp-achievements li {
    color: var(--text-secondary);
    margin-bottom: 0.7rem;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.6;
    font-size: 0.95rem;
}

.exp-achievements li::before {
    content: '•';
    position: absolute;
    left: 0.3rem;
    color: var(--accent-primary);
    font-weight: bold;
}

.exp-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1.5rem;
}

.tech-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 0.3rem 0.7rem;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid rgba(0, 217, 255, 0.2);
    border-radius: 4px;
    color: var(--accent-primary);
}

.exp-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-primary);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    margin-top: 1rem;
    transition: all 0.3s;
}

.exp-link:hover {
    gap: 0.8rem;
}

.exp-note {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 1rem;
}

.exp-note a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: opacity 0.3s;
}

.exp-note a:hover {
    opacity: 0.7;
}

/* Projects Section */
.projects {
    background: var(--bg-secondary);
}

.project-card {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.5rem;
    transition: all 0.3s var(--transition-smooth);
}

.project-card:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 12px 32px rgba(0, 217, 255, 0.15);
    transform: translateY(-4px);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 1.5rem;
}

.project-title {
    font-family: var(--font-display);
    font-size: 2rem;
    color: var(--text-primary);
    font-weight: 700;
}

.project-date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.project-description {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-primary);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    transition: all 0.3s;
}

.project-link:hover {
    gap: 0.8rem;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
}

.skill-category {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: all 0.3s var(--transition-smooth);
}

.skill-category:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
}

.skill-category-title {
    font-family: var(--font-display);
    font-size: 1.3rem;
    color: var(--accent-primary);
    margin-bottom: 1rem;
    font-weight: 600;
}

.skill-items {
    color: var(--text-secondary);
    line-height: 1.8;
}

.skill-list {
    list-style: none;
    padding-left: 0;
}

.skill-list li {
    color: var(--text-secondary);
    margin-bottom: 0.8rem;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.7;
}

.skill-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

/* Education Section */
.education {
    background: linear-gradient(180deg, transparent 0%, var(--bg-secondary) 100%);
}

.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.education-item {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: all 0.3s var(--transition-smooth);
}

.education-item:hover {
    border-color: var(--accent-primary);
    transform: translateY(-4px);
}

.edu-degree {
    font-family: var(--font-display);
    font-size: 1.4rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.edu-school {
    color: var(--accent-primary);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.edu-date {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 2rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-text {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-links {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.footer-links a {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-separator {
    color: var(--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;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }

    .nav-link {
        font-size: 0.75rem;
    }

    .hero {
        padding: 6rem 1.5rem 3rem;
    }

    section {
        padding: 4rem 1.5rem;
    }

    .section-header {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }

    .timeline {
        padding-left: 1rem;
    }

    .timeline-item {
        padding-left: 1.5rem;
    }

    .timeline-marker {
        left: -1.9rem;
    }

    .exp-header {
        flex-direction: column;
        gap: 1rem;
    }

    .exp-meta {
        align-items: flex-start;
        text-align: left;
    }

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

    .skills-grid,
    .education-grid {
        grid-template-columns: 1fr;
    }

    .footer-container {
        flex-direction: column;
        align-items: flex-start;
    }

    .hero-decoration {
        display: none;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 1rem 1.5rem;
    }

    .hero-contact {
        flex-direction: column;
        width: 100%;
    }

    .contact-btn {
        width: 100%;
        justify-content: center;
    }

    .timeline-content {
        padding: 1.5rem;
    }

    .project-card {
        padding: 1.5rem;
    }

    .skill-category,
    .education-item {
        padding: 1.5rem;
    }
}

/* Smooth scroll reveal on scroll */
.fade-in-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s var(--transition-smooth), transform 0.8s var(--transition-smooth);
}

.fade-in-section.is-visible {
    opacity: 1;
    transform: translateY(0);
}