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

:root {
    --primary-color: #2563eb;
    --secondary-color: #3b82f6;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --border-color: #e5e7eb;
    --space-xs: 0.5rem;
    --space-sm: 0.75rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;
    --container-max: 1200px;
    --container-padding: 2rem;
    --section-content-max: 960px;
}

html {
    scroll-behavior: smooth;
}

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

button,
input,
textarea,
select {
    font: inherit;
}

button {
    border: 0;
    background: transparent;
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 3px;
}

main {
    display: block;
}

nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: var(--space-md) 0;
}

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

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s;
}

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

.mobile-menu {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--space-xs);
    border-radius: 8px;
    transition: background 0.3s;
    color: var(--text-primary);
}

.mobile-menu:hover {
    background: var(--bg-secondary);
}

.mobile-nav {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: white;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    z-index: 999;
    padding: var(--space-md);
}

.mobile-nav.active {
    display: block;
}

.mobile-nav ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.mobile-nav a {
    display: block;
    padding: var(--space-md);
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    border-radius: 8px;
    transition: background 0.3s;
}

.mobile-nav a:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(var(--space-4xl) + 60px) var(--container-padding) var(--space-3xl);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    max-width: 700px;
    position: relative;
    z-index: 1;
}

.avatar {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    border: 3px solid rgba(255, 255, 255, 0.3);
    margin-bottom: var(--space-xl);
    object-fit: cover;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--space-xs);
    letter-spacing: -0.02em;
}

.hero .subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    opacity: 0.9;
    margin-bottom: var(--space-lg);
    font-weight: 400;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.tech-tag {
    background: rgba(255, 255, 255, 0.15);
    padding: var(--space-xs) var(--space-md);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s;
}

.tech-tag:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.cta-buttons {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    padding: var(--space-sm) var(--space-xl);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.95rem;
}

.btn-primary {
    background: white;
    color: var(--primary-color);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.4);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
    transform: translateY(-2px);
}

.stats {
    display: flex;
    justify-content: center;
    gap: var(--space-3xl);
    margin-top: var(--space-3xl);
    padding-top: var(--space-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    margin-bottom: var(--space-xs);
}

.stat-label {
    font-size: 0.8rem;
    opacity: 0.7;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.section {
    padding: var(--space-3xl) var(--container-padding);
    max-width: var(--container-max);
    margin: 0 auto;
}

.section-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--space-2xl);
    color: var(--text-primary);
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
}

.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-lg);
    width: 100%;
    max-width: var(--section-content-max);
    margin: 0 auto;
}

.skills-grid {
    display: contents;
}

.skill-item {
    background: white;
    padding: var(--space-lg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    transition: all 0.3s ease;
    text-align: center;
}

.skill-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    border-color: var(--primary-color);
}

.skill-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: var(--space-xs);
}

.skill-level {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

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

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-xl);
    width: 100%;
    max-width: var(--section-content-max);
    margin: 0 auto;
}

.project-card {
    background: white;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.project-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.project-header {
    padding: var(--space-xl);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.project-tech {
    font-size: 0.875rem;
    opacity: 0.9;
}

.project-body {
    padding: var(--space-xl);
}

.project-description {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.project-links {
    display: flex;
    gap: var(--space-lg);
}

.project-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap 0.3s;
}

.project-link:hover {
    gap: 8px;
}

.articles {
    background: var(--bg-primary);
}

.articles-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    width: 100%;
    max-width: var(--section-content-max);
    margin: 0 auto;
}

.article-card {
    background: white;
    border-radius: 12px;
    padding: var(--space-xl);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    text-decoration: none;
    color: inherit;
    display: block;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.article-layout {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: var(--space-lg);
    align-items: start;
}

.article-cover {
    width: 100%;
    aspect-ratio: 3 / 2;
    border-radius: 10px;
    background: var(--bg-secondary);
    overflow: hidden;
}

.article-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.article-body {
    min-width: 0;
}

.article-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    border-color: var(--primary-color);
}

.article-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--space-sm);
    gap: var(--space-md);
}

.article-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    flex: 1;
}

.article-date {
    font-size: 0.75rem;
    color: var(--text-secondary);
    white-space: nowrap;
    background: var(--bg-secondary);
    padding: 2px 8px;
    border-radius: 4px;
}

.article-summary {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: var(--space-md);
    display: -webkit-box;
    line-clamp: 2;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-meta {
    display: flex;
    gap: var(--space-lg);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.article-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.articles-more {
    text-align: center;
    margin-top: var(--space-2xl);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: var(--space-sm) var(--space-xl);
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
}

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

.contact-links {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-lg);
    width: 100%;
    max-width: var(--section-content-max);
    margin: 0 auto;
}

.contact-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    background: white;
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    font-weight: 500;
    cursor: pointer;
}

.contact-item:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(37, 99, 235, 0.25);
    border-color: var(--primary-color);
}

.loading {
    text-align: center;
    padding: var(--space-3xl);
    color: var(--text-secondary);
    font-size: 1rem;
}

footer {
    background: var(--text-primary);
    color: white;
    text-align: center;
    padding: var(--space-xl);
}

footer p {
    opacity: 0.7;
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    :root {
        --container-padding: 1.25rem;
    }

    .nav-links {
        display: none;
    }

    .mobile-menu {
        display: block;
    }

    .hero {
        padding-top: calc(var(--space-3xl) + 60px);
    }

    .avatar {
        width: 120px;
        height: 120px;
    }

    .stats {
        gap: var(--space-xl);
    }

    .about-content {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
    }

    .skill-item {
        padding: var(--space-md);
    }

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

    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

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

    .article-header {
        flex-direction: column;
        gap: var(--space-xs);
    }

    .article-title {
        font-size: 1rem;
    }

    .article-meta {
        flex-wrap: wrap;
        gap: var(--space-md);
    }

    .article-layout {
        grid-template-columns: 96px 1fr;
        gap: var(--space-md);
    }

    .contact-links {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: var(--space-md);
    }

    .contact-item {
        padding: var(--space-sm) var(--space-md);
        font-size: 0.9rem;
    }

    .contact-links .contact-item:last-child {
        grid-column: 1 / -1;
    }
}

@media (max-width: 480px) {
    .about-content {
        grid-template-columns: 1fr;
    }

    .stats {
        flex-direction: column;
        gap: var(--space-lg);
    }

    .stat-item {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: var(--space-sm);
    }

    .stat-label {
        margin: 0;
    }

    .article-layout {
        grid-template-columns: 1fr;
    }

    .article-cover {
        aspect-ratio: 3 / 2;
    }

    .contact-links {
        grid-template-columns: 1fr;
    }

    .contact-links .contact-item:last-child {
        grid-column: auto;
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-in {
    animation: fadeInUp 0.6s ease-out;
}