:root {
    --primary: #0f172a;
    --secondary: #1e293b;
    --accent: #3b82f6;
    --accent-dark: #1e40af;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --border: #e2e8f0;
    --bg-light: #f8fafc;
}

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

html {
    scroll-behavior: smooth;
}

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

header {
    background: white;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.4rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    gap: 3rem;
    list-style: none;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s ease;
}

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

.page {
    display: none;
    animation: fadeIn 0.6s ease-in-out;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.hero-section {
    padding: 6rem 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.hero-content .highlight {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.cta-buttons {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.btn {
    padding: 0.85rem 2rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    font-family: 'Sora', sans-serif;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--accent);
    border: 2px solid var(--accent);
}

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

.hero-image {
    position: relative;
    height: 500px;
}

.hero-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 12px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.1);
}

.image-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #e0e7ff 0%, #f3e8ff 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
    font-size: 1.1rem;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.1);
}

.portfolio-header {
    text-align: center;
    padding: 4rem 2rem 3rem;
}

.portfolio-header h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.portfolio-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.years-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    padding: 2rem;
    margin-bottom: 3rem;
}

.year-card {
    background: white;
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 2.5rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.year-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent) 0%, var(--accent-dark) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.year-card:hover {
    border-color: var(--accent);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.1);
    transform: translateY(-5px);
}

.year-card:hover::before {
    opacity: 1;
}

.year-card h3 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: var(--accent);
}

.year-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.year-card.inactive {
    opacity: 0.6;
    cursor: not-allowed;
    background: var(--bg-light);
}

.year-card.inactive:hover {
    border-color: var(--border);
    box-shadow: none;
    transform: none;
}

.year-card button {
    background: var(--accent);
    color: white;
    padding: 0.7rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: 'Sora', sans-serif;
}

.year-card button:hover:not(:disabled) {
    background: var(--accent-dark);
    transform: translateY(-2px);
}

.year-card.inactive button {
    background: #cbd5e1;
    cursor: not-allowed;
}

.competences-section {
    display: none;
    padding: 2rem;
}

.competences-section.active {
    display: block;
}

.back-btn {
    background: transparent;
    color: var(--accent);
    border: none;
    padding: 0.5rem 0;
    margin-bottom: 2rem;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    font-family: 'Sora', sans-serif;
}

.back-btn:hover {
    gap: 1rem;
    color: var(--accent-dark);
}

.competences-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    text-align: center;
    color: var(--text-primary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.skill-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid var(--border);
    cursor: pointer;
}

.skill-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.15);
    border-color: var(--accent);
}

.skill-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #e0e7ff 0%, #f3e8ff 100%);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
    font-size: 3rem;
}

.skill-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.skill-content {
    padding: 1.8rem;
}

.skill-title {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.8rem;
}

.skill-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.skill-detail {
    animation: fadeIn 0.6s ease-in-out;
}

.skill-detail-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-primary);
    text-align: center;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.skill-objective {
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    margin-bottom: 3rem;
}

.skill-objective h3 {
    font-size: 1.5rem;
    color: var(--accent);
    margin-bottom: 1.2rem;
}

.skill-objective p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.skill-projects {
    margin-bottom: 3rem;
}

.skill-projects h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 2rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.project-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--border);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.15);
    border-color: var(--accent);
}

.project-image {
    width: 100%;
    height: 220px;
    overflow: hidden;
    background: linear-gradient(135deg, #e0e7ff 0%, #f3e8ff 100%);
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-content {
    padding: 1.8rem;
}

.project-content h4 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.8rem;
}

.project-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 1.2rem;
}

.project-technologies {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.tech-badge {
    display: inline-block;
    background: var(--bg-light);
    color: var(--accent);
    padding: 0.4rem 0.9rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    border: 1px solid var(--accent);
    transition: all 0.3s ease;
}

.tech-badge:hover {
    background: var(--accent);
    color: white;
}

.contact-header {
    text-align: center;
    padding: 4rem 2rem 3rem;
}

.contact-header h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: 1rem;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    padding: 2rem;
    margin-bottom: 3rem;
}

.contact-form {
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

.form-group {
    margin-bottom: 1.8rem;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.6rem;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.85rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-family: 'Sora', sans-serif;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    background: var(--bg-light);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    background: white;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

.btn-submit {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
    font-family: 'Sora', sans-serif;
}

.btn-submit:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.info-card {
    background: white;
    padding: 1.8rem;
    border-radius: 12px;
    border: 1px solid var(--border);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.info-card:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 25px rgba(59, 130, 246, 0.15);
}

.info-card h3 {
    color: var(--accent);
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
}

.info-card p,
.info-card a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    line-height: 1.6;
}

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

.photo-section {
    margin-bottom: 2rem;
}

.profile-photo {
    width: 100%;
    height: 280px;
    background: linear-gradient(135deg, #e0e7ff 0%, #f3e8ff 100%);
    border-radius: 12px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.profile-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.social-icons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.social-icon {
    width: 45px;
    height: 45px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.social-icon:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

@media (max-width: 768px) {
    .nav-menu {
        gap: 1.5rem;
    }

    .hero-section {
        grid-template-columns: 1fr;
        padding: 3rem 2rem;
    }

    .hero-image {
        height: 300px;
    }

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

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

    .cta-buttons {
        flex-direction: column;
    }

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

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

    .nav-menu {
        gap: 1rem;
        font-size: 0.85rem;
    }

    .hero-content h1 {
        font-size: 1.8rem;
    }

    .hero-content p {
        font-size: 0.95rem;
    }
}