:root {
    --color-bg: #ffffff;
    --color-bg-alt: #f7f7f7;
    --color-text: #2d2d2d;
    --color-text-light: #666666;
    --color-border: #e0e0e0;
    --color-accent: #333333;
    --font-primary: 'Inter', sans-serif;
    --header-height: 80px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

a:hover {
    color: var(--color-text-light);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 6rem 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: 3rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    font-weight: 500;
    text-align: center;
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 2px;
}

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

.btn-primary:hover {
    background-color: var(--color-text);
    color: var(--color-bg);
}

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

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

/* Header & Nav */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

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

.nav-link {
    color: var(--color-text-light);
    font-weight: 500;
    position: relative;
}

.nav-link:hover, .nav-link.active {
    color: var(--color-text);
}

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

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

.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    position: relative;
    transition: var(--transition);
}

.hamburger::before, .hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: var(--transition);
}

.hamburger::before {
    top: -6px;
}

.hamburger::after {
    bottom: -6px;
}

.mobile-menu-btn[aria-expanded="true"] .hamburger {
    background-color: transparent;
}

.mobile-menu-btn[aria-expanded="true"] .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.mobile-menu-btn[aria-expanded="true"] .hamburger::after {
    bottom: 0;
    transform: rotate(-45deg);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-height);
    background-color: var(--color-bg);
}

.hero-container {
    text-align: center;
    max-width: 100%;
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-text-light);
    font-weight: 400;
    margin-bottom: 2rem;
}

.hero-text {
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--color-text-light);
    margin-bottom: 3rem;
    max-width: 980px;
    margin-left: auto;
    margin-right: auto;
}

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

/* Portfolio Section */
.portfolio {
    background-color: var(--color-bg-alt);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.project-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 2px;
    overflow: hidden;
    transition: var(--transition);
}

.project-card:hover {
    border-color: var(--color-text-light);
}

.project-image-placeholder {
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-light);
    font-size: 0.9rem;
    overflow: hidden;
}

.project-card-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    display: block;
    transition: transform 0.3s ease;
}

.project-card:hover .project-card-thumb {
    transform: scale(1.03);
}

.project-detail-hero-img {
    margin: 2rem 0;
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid var(--color-border);
    background-color: #0d1117;
}

.project-detail-hero-img img {
    width: 100%;
    height: auto;
    display: block;
}

.project-content {
    padding: 1.5rem;
}

.project-title {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.project-desc {
    color: var(--color-text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tag {
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    background-color: var(--color-bg-alt);
    color: var(--color-text-light);
    border: 1px solid var(--color-border);
    border-radius: 2px;
}

.project-link {
    font-size: 0.9rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
}

.project-links-group {
    display: flex;
    align-items: center;
    gap: 1.2rem;
    flex-wrap: wrap;
}

.project-links-group .external-link {
    color: var(--color-text-light);
    font-size: 0.85rem;
}

.project-links-group .external-link:hover {
    color: var(--color-accent);
}

/* Project Detail Pages */
.project-detail-main {
    padding-top: var(--header-height);
}

.project-detail-header {
    background-color: var(--color-bg);
    padding: 4rem 0 3rem 0;
    border-bottom: 1px solid var(--color-border);
}

.project-breadcrumbs {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 1.5rem;
}

.project-breadcrumbs a {
    color: var(--color-text-light);
}

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

.project-breadcrumbs span {
    color: var(--color-text);
    font-weight: 500;
}

.project-detail-title {
    font-size: 2.6rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.project-detail-tagline {
    font-size: 1.2rem;
    color: var(--color-text-light);
    line-height: 1.6;
    margin-bottom: 2rem;
    max-width: 900px;
}

.project-action-links {
    margin-bottom: 2rem;
}

.project-detail-tags {
    margin-bottom: 0;
}

.project-detail-body {
    padding: 4rem 0 6rem 0;
}

.project-detail-container {
    max-width: 860px;
}

.project-content-block {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    padding: 2.5rem;
    margin-bottom: 2.5rem;
    border-radius: 2px;
}

.project-content-block h2 {
    font-size: 1.6rem;
    margin-bottom: 1.2rem;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 0.6rem;
}

.project-content-block p {
    color: var(--color-text-light);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 1.2rem;
}

.project-content-block p:last-child {
    margin-bottom: 0;
}

.detail-list {
    margin-top: 1rem;
    padding-left: 1.2rem;
    list-style: disc;
}

.detail-list li {
    color: var(--color-text-light);
    line-height: 1.7;
    margin-bottom: 0.75rem;
}

.detail-list li strong {
    color: var(--color-text);
}

.feature-item {
    margin-bottom: 1.8rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px dashed var(--color-border);
}

.feature-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.feature-item h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.feature-item p {
    margin-bottom: 0.5rem;
}

.stack-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.stack-card {
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    padding: 1.2rem;
    border-radius: 2px;
}

.stack-card h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.stack-card p {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 0;
    line-height: 1.5;
}

.table-container {
    overflow-x: auto;
    margin-top: 1.5rem;
}

.tech-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.tech-table th, .tech-table td {
    padding: 0.9rem 1rem;
    border: 1px solid var(--color-border);
    text-align: left;
}

.tech-table th {
    background-color: var(--color-bg-alt);
    color: var(--color-text);
    font-weight: 600;
}

.tech-table td {
    color: var(--color-text-light);
}

.tech-table td strong {
    color: var(--color-text);
}

.project-bottom-cta {
    display: flex;
    gap: 1rem;
    margin-top: 3rem;
}

@media (max-width: 768px) {
    .project-detail-title {
        font-size: 2rem;
    }
    .stack-grid {
        grid-template-columns: 1fr;
    }
    .project-content-block {
        padding: 1.5rem;
    }
    .project-bottom-cta {
        flex-direction: column;
    }
}

/* Curriculum Section */
.cv-layout {
    display: grid;
    grid-template-columns: 4fr 6fr;
    gap: 4rem;
}

.cv-left h3, .cv-right h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.cv-profile {
    margin-bottom: 2.5rem;
}

.skills-list, .languages-list {
    margin-bottom: 2.5rem;
}

.skills-list li, .languages-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-light);
}

.skills-list li:last-child, .languages-list li:last-child {
    border-bottom: none;
}

.cv-download {
    margin-top: 2rem;
}

.cv-experience {
    margin-bottom: 3rem;
}

.timeline {
    border-left: 2px solid var(--color-border);
    padding-left: 2rem;
    margin-left: 0.5rem;
}

.timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
}

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

.timeline-dot {
    position: absolute;
    left: -2.35rem;
    top: 0.25rem;
    width: 12px;
    height: 12px;
    background-color: var(--color-accent);
    border-radius: 50%;
    border: 2px solid var(--color-bg);
}

.timeline-title {
    font-size: 1.2rem;
    margin-bottom: 0.2rem;
}

.timeline-meta {
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-bottom: 0.8rem;
    font-weight: 500;
}

.timeline-desc {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* Contact Section */
.contacte {
    background-color: var(--color-bg-alt);
}

.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.info-item {
    margin-bottom: 2rem;
}

.info-item h4 {
    font-size: 1rem;
    color: var(--color-text-light);
    margin-bottom: 0.25rem;
    font-weight: 500;
}

.info-item a, .info-item p {
    font-size: 1.1rem;
    color: var(--color-text);
}

.social-links {
    display: flex;
    gap: 1.5rem;
}

.social-links h4 {
    width: 100%;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 0.8rem 0;
    font-family: inherit;
    font-size: 1rem;
    color: var(--color-text);
    background-color: transparent;
    border: none;
    border-bottom: 1px solid var(--color-border);
    outline: none;
    transition: var(--transition);
}

.form-group input:focus, .form-group textarea:focus {
    border-bottom-color: var(--color-accent);
}

.form-group textarea {
    resize: vertical;
}

.form-success {
    margin-top: 1rem;
    padding: 1rem;
    background-color: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #166534;
    border-radius: 2px;
}

.hidden {
    display: none;
}

/* Footer */
.footer {
    background-color: #2d2d2d;
    color: #ffffff;
    padding: 3rem 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid #404040;
}

.copyright {
    color: #a3a3a3;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: #ffffff;
}

.footer-links a:hover {
    color: #a3a3a3;
}

.made-with {
    text-align: center;
    color: #a3a3a3;
    font-size: 0.9rem;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* Responsive */
@media (max-width: 992px) {
    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .cv-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }
    
    .main-nav {
        position: fixed;
        top: var(--header-height);
        left: -100%;
        width: 100%;
        height: calc(100vh - var(--header-height));
        background-color: var(--color-bg);
        transition: var(--transition);
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    .main-nav.open {
        left: 0;
    }
    
    .nav-links {
        flex-direction: column;
        align-items: center;
        gap: 2rem;
    }
    
    .nav-link {
        font-size: 1.5rem;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-layout {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}