:root {
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-card: #1f2937;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --accent: #4a90d9;
    --accent-hover: #60a5fa;
    --border: #374151;
    --shadow: rgba(0, 0, 0, 0.3);
}

.light-theme {
    --bg-primary: #f8f9fa;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --accent: #2563eb;
    --accent-hover: #3b82f6;
    --border: #e5e7eb;
    --shadow: rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    color: var(--accent-hover);
}

/* Navigation */
.glass-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.nav-content {
    max-width: 1000px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.2s;
}

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

.theme-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

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

.theme-toggle svg {
    width: 18px;
    height: 18px;
    fill: var(--text-secondary);
}

.theme-toggle .icon-moon {
    display: none;
}

.light-theme .theme-toggle .icon-sun {
    display: none;
}

.light-theme .theme-toggle .icon-moon {
    display: block;
}

/* Hero Header */
.hero {
    background: var(--bg-secondary);
    padding: 6rem 2rem 4rem;
    border-bottom: 1px solid var(--border);
}

.hero-content {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.hero-name {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.hero-title {
    font-size: 1.25rem;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 1rem;
}

.hero-tagline {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 1.5rem;
    font-size: 0.95rem;
}

.hero-contact {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.hero-contact span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.hero-contact svg {
    width: 16px;
    height: 16px;
    fill: var(--accent);
}

.hero-links {
    margin-top: 1.5rem;
}

.hero-links a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    background: var(--bg-card);
    transition: all 0.2s;
}

.hero-links a:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.hero-links a.primary {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.hero-links a.primary:hover {
    background: var(--accent-hover);
    color: white;
}

.hero-links svg {
    width: 18px;
    height: 18px;
}

/* Sections */
.section {
    padding: 4rem 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--text-primary);
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--accent);
    display: inline-block;
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

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

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.about-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
}

.about-card h3 {
    font-size: 1rem;
    color: var(--accent);
    margin-bottom: 0.75rem;
}

.about-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Expertise Section */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.expertise-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
}

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

.expertise-card h3 {
    font-size: 1rem;
    color: var(--accent);
    margin-bottom: 1rem;
}

.expertise-list {
    list-style: none;
    margin-bottom: 1rem;
}

.expertise-list li {
    position: relative;
    padding-left: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.expertise-tech {
    font-size: 0.85rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    padding-top: 0.75rem;
}

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

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

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

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

.timeline-marker {
    position: absolute;
    left: -2rem;
    top: 0.35rem;
    width: 10px;
    height: 10px;
    background: var(--accent);
    border-radius: 50%;
}

.timeline-year {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    background: var(--accent);
    color: white;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.timeline-content h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.timeline-company {
    color: var(--accent);
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.timeline-details {
    list-style: none;
    margin-bottom: 0.75rem;
}

.timeline-details li {
    position: relative;
    padding-left: 1rem;
    margin-bottom: 0.4rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.timeline-details li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent);
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.timeline-tags span {
    padding: 0.25rem 0.6rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.timeline-badge {
    display: inline-block;
    padding: 0.25rem 0.6rem;
    background: var(--bg-secondary);
    border: 1px solid var(--accent);
    color: var(--accent);
    font-size: 0.8rem;
    font-weight: 500;
    border-radius: 4px;
    margin-top: 0.5rem;
}

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

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
}

.contact-card h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.contact-card a {
    font-weight: 500;
}

.contact-card svg {
    width: 24px;
    height: 24px;
    fill: var(--accent);
    margin-bottom: 0.75rem;
}

.cta-download {
    text-align: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 1.5rem;
    border-radius: 6px;
    font-weight: 500;
    font-size: 0.95rem;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

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

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

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

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

/* Footer */
.footer {
    padding: 2rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-top: 1px solid var(--border);
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 44px;
    height: 44px;
    background: var(--accent);
    border: none;
    border-radius: 8px;
    color: white;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--accent-hover);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero {
        padding: 4rem 1.5rem 3rem;
    }

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

    .hero-contact {
        flex-direction: column;
        gap: 0.75rem;
    }

    .section {
        padding: 3rem 1.5rem;
    }

    .timeline {
        padding-left: 1.5rem;
    }

    .timeline-marker {
        left: -1.5rem;
    }
}