:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a25;
    --text-primary: #e4e4e7;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --accent-primary: #22d3ee;
    --accent-secondary: #06b6d4;
    --accent-gradient: linear-gradient(135deg, #22d3ee 0%, #06b6d4 100%);
    --border-color: #27272a;
    --card-bg: rgba(26, 26, 37, 0.8);
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(34, 211, 238, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(6, 182, 212, 0.06) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: width var(--transition-normal);
}

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

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 64px;
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.greeting {
    color: var(--accent-primary);
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 8px;
    font-family: var(--font-mono);
}

.name {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    color: var(--text-secondary);
    margin-bottom: 24px;
}

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

.description {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 32px;
    max-width: 540px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(34, 211, 238, 0.3);
}

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

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

.terminal {
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.4);
}

.terminal-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #10b981; }

.terminal-body {
    padding: 20px;
}

.terminal-body pre {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.8;
}

.terminal-body code {
    color: var(--text-secondary);
}

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

.cursor {
    animation: blink 1s step-end infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0; }
}

.section {
    padding: 100px 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 48px;
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--accent-gradient);
    border-radius: 2px;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 64px;
    align-items: start;
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 24px;
    min-width: 200px;
}

.stat {
    text-align: center;
    padding: 24px;
    background: var(--card-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
    justify-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.skill-category {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 32px;
    border: 1px solid var(--border-color);
    transition: border-color var(--transition-normal), transform var(--transition-normal);
    width: 100%;
    max-width: 320px;
    text-align: center;
}

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

.skill-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-gradient);
    border-radius: 12px;
    margin: 0 auto 20px auto;
}

.skill-icon svg {
    color: var(--bg-primary);
}

.skill-category h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.skill-list {
    list-style: none;
    text-align: left;
}

.skill-list li {
    padding: 8px 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
    border-bottom: 1px solid var(--border-color);
}

.skill-list li:last-child {
    border-bottom: none;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.project-card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 32px;
    border: 1px solid var(--border-color);
    transition: border-color var(--transition-normal), transform var(--transition-normal);
}

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

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.project-type {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 4px 12px;
    border-radius: 100px;
}

.project-type.security {
    background: rgba(239, 68, 68, 0.15);
    color: #f87171;
}

.project-type.development {
    background: rgba(34, 211, 238, 0.15);
    color: var(--accent-primary);
}

.project-links {
    display: flex;
    gap: 12px;
}

.project-links a {
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

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

.project-card h3 {
    font-size: 1.35rem;
    font-weight: 600;
    margin-bottom: 12px;
}

.project-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 20px;
    line-height: 1.7;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tech span {
    font-size: 0.8rem;
    font-family: var(--font-mono);
    padding: 4px 12px;
    background: var(--bg-tertiary);
    border-radius: 6px;
    color: var(--text-muted);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

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

.timeline-item {
    position: relative;
    padding-left: 48px;
    padding-bottom: 48px;
}

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

.timeline-marker {
    position: absolute;
    left: -7px;
    top: 8px;
    width: 16px;
    height: 16px;
    background: var(--bg-primary);
    border: 3px solid var(--accent-primary);
    border-radius: 50%;
}

.timeline-content {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 24px;
    border: 1px solid var(--border-color);
}

.timeline-header {
    margin-bottom: 8px;
}

.timeline-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.timeline-company {
    color: var(--accent-primary);
    font-weight: 500;
}

.timeline-date {
    display: inline-block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 16px;
    padding: 4px 12px;
    background: var(--bg-tertiary);
    border-radius: 6px;
}

.timeline-content ul {
    list-style: none;
}

.timeline-content li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

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

.contact-intro {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 48px;
}

.contact-content {
    display: flex;
    justify-content: center;
    gap: 48px;
    max-width: 900px;
    margin: 0 auto;
    align-items: flex-start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
    justify-content: center;
    flex: 0 0 auto;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.contact-item svg {
    color: var(--accent-primary);
    flex-shrink: 0;
}

.contact-item a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.contact-item a:hover {
    color: var(--accent-primary);
}

.contact-form {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 32px;
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form .btn {
    width: 100%;
}

.footer {
    padding: 32px 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-content p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-tagline {
    margin-top: 8px;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-style: italic;
}

@media (max-width: 1024px) {
    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
        justify-items: center;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--bg-secondary);
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid var(--border-color);
    }

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

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

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .description {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-visual {
        order: -1;
    }

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

    .about-stats {
        flex-direction: row;
        justify-content: center;
    }

    .stat {
        flex: 1;
    }

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

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

    .contact-content {
        flex-direction: column;
        align-items: center;
    }

    .contact-info {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }

    .about-stats {
        flex-direction: column;
    }
}