/* ======================
   Variables CSS
====================== */
:root {
    --primary-color: #0057b8;    /* Bleu ukrainien */
    --primary-dark: #004285;
    --secondary-color: #ffd700;  /* Jaune ukrainien */
    --accent-color: #f59e0b;
    --light-color: #f8fafc;
    --dark-color: #0f172a;
    --gray-color: #64748b;
    --text-color: #1e293b;
    --text-light: #94a3b8;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 0.5rem;
    --radius-lg: 1rem;
    --transition: all 0.3s ease;
}

/* ======================
   Reset et Base
====================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--light-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* ======================
   Conteneurs
====================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.section {
    padding: 6rem 0;
}

/* ======================
   Header
====================== */
header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.logo span {
    color: var(--secondary-color);
}

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

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

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

/* Language Selector */
.language-selector {
    display: flex;
    gap: 0.5rem;
    margin-left: 1rem;
}

.lang-btn {
    padding: 0.3rem 0.6rem;
    background: none;
    border: 1px solid var(--gray-color);
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 500;
    color: var(--text-color);
    transition: var(--transition);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
}

.lang-btn:hover {
    background-color: #f1f5f9;
    color: var(--primary-color);
}

.lang-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.hamburger {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background-color: white;
    box-shadow: var(--shadow-lg);
    padding: 1rem;
    z-index: 999;
}

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

.mobile-menu ul {
    list-style: none;
}

.mobile-menu li {
    padding: 0.75rem 0;
    border-bottom: 1px solid #e2e8f0;
}

.mobile-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
}

/* ======================
   Ukraine Banner
====================== */
.ukraine-banner {
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    text-align: center;
    padding: 0.75rem;
    font-weight: 500;
    margin-top: 70px;
}

/* Adaptation pour mobile */
@media (max-width: 768px) {
    .ukraine-banner {
        margin-top: 100px; /* Ajusté pour mobile */
    }
}

.ukraine-banner a {
    color: white;
    text-decoration: none;
    margin-left: 0.5rem;
}

.ukraine-banner i {
    margin-right: 0.5rem;
}

/* ======================
   Hero Section
====================== */
#hero {
    min-height: calc(100vh - 120px);
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    color: var(--dark-color);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
    color: var(--primary-color);
}

.hero-text p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.hero-image {
    text-align: center;
}

.hero-image img {
    max-width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* ======================
   Buttons
====================== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background-color: #e6c200;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* ======================
   Section Titles
====================== */
.section-title {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark-color);
}

.section-title p {
    color: var(--gray-color);
    font-size: 1.1rem;
}

/* ======================
   About Section
====================== */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-image {
    text-align: center;
}

.about-image img {
    max-width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.about-text h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

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

/* ======================
   Skills Tabs
====================== */
.skills-tabs {
    margin-top: 2rem;
}

.skills-tab-buttons {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid #e2e8f0;
}

.skills-tab-button {
    padding: 0.5rem 1rem;
    background: none;
    border: none;
    cursor: pointer;
    font-weight: 500;
    color: var(--gray-color);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 2px solid transparent;
}

.skills-tab-button:hover {
    color: var(--primary-color);
}

.skills-tab-button.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.skills-tab-button i {
    font-size: 0.9rem;
}

.skills-tab-content {
    margin-top: 1rem;
}

.skills-tab-pane {
    display: none;
}

.skills-tab-pane.active {
    display: block;
}

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

.skill-category {
    margin-bottom: 1.5rem;
}

.skill-category h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.skill-category h4 i {
    color: var(--primary-color);
}

.skill-item {
    margin-bottom: 1rem;
}

.skill-name {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.skill-bar {
    height: 8px;
    background-color: #e2e8f0;
    border-radius: var(--radius);
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: var(--radius);
    transition: width 1.5s ease-in-out;
}

/* ======================
   CV Section
====================== */
#cv {
    background-color: white;
}

.cv-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.cv-title {
    flex: 1;
}

.cv-title h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--dark-color);
}

.cv-title p {
    color: var(--gray-color);
    font-size: 1.1rem;
}

.cv-actions {
    display: flex;
    gap: 1rem;
}

.cv-download {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.cv-content {
    max-width: 1000px;
    margin: 0 auto;
}

.timeline {
    position: relative;
    padding-left: 3rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 1.5rem;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
}

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.timeline-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -3rem;
    top: 5px;
    width: 12px;
    height: 12px;
    background-color: var(--primary-color);
    border-radius: 50%;
    border: 3px solid white;
}

.timeline-icon {
    position: absolute;
    left: -3.5rem;
    top: 0;
    font-size: 1.2rem;
    color: var(--primary-color);
    background-color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow);
}

.timeline-date {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.timeline-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--dark-color);
}

.timeline-description {
    color: var(--text-color);
    margin-bottom: 1rem;
}

.timeline-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.timeline-tag {
    background-color: #e2e8f0;
    color: var(--text-color);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius);
    font-size: 0.8rem;
}

/* ======================
   Projects Section
====================== */
#projects {
    background-color: #f1f5f9;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.project-image {
    height: 200px;
    overflow: hidden;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

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

.project-info {
    padding: 1.5rem;
}

.project-info h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--dark-color);
}

.project-info p {
    color: var(--text-color);
    margin-bottom: 1rem;
}

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

.tag {
    background-color: #e2e8f0;
    color: var(--text-color);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius);
    font-size: 0.8rem;
}

/* ======================
   Contact Section
====================== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.contact-info p {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border-radius: 50%;
    transition: var(--transition);
}

.social-links a:hover {
    transform: scale(1.1);
}

.contact-form {
    background-color: white;
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-color);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #e2e8f0;
    border-radius: var(--radius);
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition);
}

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

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

/* ======================
   Footer
====================== */
footer {
    background-color: var(--dark-color);
    color: white;
    text-align: center;
    padding: 2rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: white;
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--secondary-color);
}

.footer-ukraine {
    margin-top: 1rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

.footer-ukraine a {
    color: var(--secondary-color);
    text-decoration: none;
}

.footer-ukraine i {
    color: var(--secondary-color);
    margin-right: 0.3rem;
}

/* ======================
   Animations
====================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out forwards;
}

/* ======================
   Responsive Design
====================== */
@media (max-width: 768px) {
    .hero-content,
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .hero-text h1 {
        font-size: 2.5rem;
    }

    .nav-links {
        display: none;
    }

    .hamburger {
        display: block;
    }

    .language-selector {
        margin-left: 0;
        margin-right: 1rem;
    }

    .timeline::before {
        left: 0.5rem;
    }

    .timeline-item::before {
        left: -1.5rem;
    }

    .timeline-icon {
        left: -2rem;
    }

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

    .section-title h2 {
        font-size: 2rem;
    }

    .cv-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .cv-actions {
        width: 100%;
        justify-content: flex-start;
    }
}

/* Styles pour les filtres */
.skills-filters {
    margin-bottom: 2rem;
    text-align: center;
}

.skills-filters h4 {
    margin-bottom: 1rem;
    color: var(--dark-color);
}

.filter-buttons {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1rem;
    background-color: #f1f5f9;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 500;
    color: var(--text-color);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-btn:hover {
    background-color: #e2e8f0;
    color: var(--primary-color);
}

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

.filter-btn i {
    font-size: 0.9rem;
}

/* Animations pour les barres de compétences */
.skill-progress {
    transition: width 1.5s ease-in-out;
}

.skill-item {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.skill-item.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Style pour les icônes des compétences */
.skill-icon {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

/* Animation au survol des compétences */
.skill-item:hover .skill-icon {
    transform: scale(1.2);
    transition: transform 0.3s ease;
}