:root {
    --primary-color: #818cf8;
    --primary-dark: #6366f1;
    --secondary-color: #a78bfa;
    --text-primary: #f3f4f6;
    --text-secondary: #d1d5db;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-dark: #020617;
    --border-color: #334155;
    --card-bg: #1e293b;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Chiron Hei HK', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

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

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.logo:hover {
    color: var(--primary-dark);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

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

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 3px;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    color: white;
    padding-top: 80px;
}

.hero-cigar {
    position: relative;
    background: none;
    overflow: hidden;
}

.hero-cigar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('images/cigar.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    filter: blur(4px);
    z-index: 0;
}

.hero-cigar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: 1;
}

.hero-cigar .container {
    position: relative;
    z-index: 2;
}

.hero-content {
    text-align: center;
    animation: fadeInUp 1s ease;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.highlight {
    color: #fbbf24;
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    opacity: 0.95;
}

.hero-description {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.btn {
    padding: 0.875rem 2rem;
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* Sections */
.section {
    padding: 5rem 0;
}

.section:nth-child(even) {
    background-color: var(--bg-secondary);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-primary);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

/* About Section */
.about-content {
    max-width: 1000px;
    margin: 0 auto;
}

.about-intro {
    text-align: center;
    margin-bottom: 3rem;
}

.about-intro h3 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.about-tagline {
    font-size: 1.25rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0;
}

.about-text {
    max-width: 800px;
    margin: 0 auto 3rem;
}

.about-text p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
    text-align: center;
}

.about-skills {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.skill-item {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: var(--transition);
}

.skill-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.skill-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.skill-item h4 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.skill-item p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Timeline Section */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    padding-left: 60px;
    margin-bottom: 3rem;
}

.timeline-marker {
    position: absolute;
    left: 11px;
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    border: 4px solid var(--bg-primary);
    box-shadow: 0 0 0 2px var(--primary-color);
    z-index: 1;
}

.timeline-content {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.timeline-date {
    color: var(--primary-color);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.timeline-content h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.timeline-content h4 {
    font-size: 1.125rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-weight: 500;
}

.timeline-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

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

.tag {
    padding: 0.25rem 0.75rem;
    background-color: rgba(129, 140, 248, 0.1);
    color: var(--primary-color);
    border: 1px solid rgba(129, 140, 248, 0.3);
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 500;
}

/* Gallery Section */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.gallery-item {
    position: relative;
    border-radius: 0.75rem;
    overflow: hidden;
    cursor: pointer;
    aspect-ratio: 16 / 9;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.gallery-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.9), transparent);
    padding: 1.5rem;
    transform: translateY(100%);
    transition: var(--transition);
}

.gallery-item:hover .gallery-overlay {
    transform: translateY(0);
}

.gallery-item:hover img {
    transform: scale(1.05);
}

.gallery-item:hover {
    box-shadow: var(--shadow-xl);
}

.gallery-overlay h3 {
    color: white;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.gallery-overlay p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.875rem;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.skill-category {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.skill-category h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.skill-category ul {
    list-style: none;
}

.skill-category li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.skill-category li::before {
    content: '▹';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* Contact Section */
.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.contact-text {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

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

.contact-link {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.contact-link:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(5px);
    color: var(--primary-color);
}

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

/* Footer */
.footer {
    background-color: var(--bg-dark);
    color: white;
    text-align: center;
    padding: 2rem 0;
}

.footer p {
    opacity: 0.8;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background-color: var(--bg-secondary);
        width: 100%;
        padding: 2rem;
        box-shadow: var(--shadow-lg);
        border-right: 1px solid var(--border-color);
        transition: var(--transition);
    }

    .nav-links.active {
        left: 0;
    }

    .mobile-menu-toggle {
        display: flex;
    }

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

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

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

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

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

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

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

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

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }
}

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

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

    .section {
        padding: 3rem 0;
    }

    .timeline::before {
        left: 10px;
    }

    .timeline-item {
        padding-left: 40px;
    }

    .timeline-marker {
        left: 2px;
    }

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

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

    .about-intro h3 {
        font-size: 1.5rem;
    }
}