/* ============================================
   CSS Variables (Dark Theme)
   ============================================ */
:root {
    /* Colors */
    --bg-primary: #0a0a0a;
    --bg-secondary: #121212;
    --bg-cards: #1a1a1a;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --accent-primary: #3b82f6;
    --accent-secondary: #8b5cf6;
    --border: #2a2a2a;
    --hover-primary: #2563eb;
    --hover-secondary: #7c3aed;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', 'Courier New', monospace;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Layout */
    --container-width: 1200px;
    --border-radius: 8px;
    --transition: all 0.3s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
}

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

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

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

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 3rem;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 1.75rem;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

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

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

/* ============================================
   Container
   ============================================ */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
    position: relative;
    display: inline-block;
    width: 100%;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 2px;
}

/* ============================================
   Navigation
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    overflow: visible;
    position: relative;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-shrink: 0;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-primary);
    padding: var(--spacing-xs);
    flex-shrink: 0;
    white-space: nowrap;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: white;
    border: 2px solid #000;
    transition: var(--transition);
}

.nav-logo:hover {
    transform: scale(1.05);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.logo-img {
    height: 32px;
    width: auto;
    object-fit: contain;
    display: block;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
    flex-wrap: nowrap;
    margin: 0;
    padding: 0;
}

.nav-item {
    white-space: nowrap;
    margin: 0;
}

.nav-link {
    color: var(--text-primary);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: var(--transition);
    position: relative;
    white-space: nowrap;
    display: inline-block;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 2px;
    background-color: var(--accent-primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.language-selector {
    display: flex;
    align-items: center;
    position: relative;
}

.language-selector-desktop {
    display: flex;
}

.language-selector-mobile {
    display: none;
}

.nav-item-lang {
    display: none;
}

/* Language Dropdown */
.lang-dropdown {
    position: relative;
}

.lang-dropdown-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 500;
    font-size: 0.875rem;
    transition: var(--transition);
    min-width: 70px;
    justify-content: center;
}

.lang-dropdown-btn:hover {
    color: var(--text-primary);
    border-color: var(--accent-primary);
    background-color: rgba(59, 130, 246, 0.1);
}

.lang-dropdown-btn[aria-expanded="true"] {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
    background-color: rgba(59, 130, 246, 0.2);
}

.lang-dropdown-btn[aria-expanded="true"] .lang-arrow {
    transform: rotate(180deg);
}

.lang-flag {
    width: 20px;
    height: 15px;
    object-fit: cover;
    border-radius: 2px;
    display: block;
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.lang-code {
    font-weight: 600;
}

.lang-arrow {
    font-size: 0.7rem;
    transition: transform 0.3s ease;
    margin-left: 2px;
}

.lang-dropdown-menu {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background-color: var(--bg-cards);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    list-style: none;
    padding: 4px;
    margin: 0;
    min-width: 150px;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1001;
}

.lang-dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-dropdown-menu li {
    margin: 0;
}

.lang-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: transparent;
    border: none;
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    text-align: left;
    transition: var(--transition);
}

.lang-option:hover {
    background-color: rgba(59, 130, 246, 0.1);
    color: var(--text-primary);
}

.lang-option.active {
    background-color: rgba(59, 130, 246, 0.2);
    color: var(--accent-primary);
}

.lang-option .lang-flag {
    width: 24px;
    height: 18px;
    object-fit: cover;
    border-radius: 2px;
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.lang-option .lang-name {
    flex: 1;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    position: relative;
    padding-top: 80px;
}

.hero-container {
    text-align: center;
    max-width: 800px;
    padding: var(--spacing-xl);
}

.hero-name {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-size: 2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-weight: 400;
}

.hero-tagline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

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

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    min-height: 44px;
    min-width: 120px;
}

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

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

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

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

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

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

/* ============================================
   About Section
   ============================================ */
.about {
    padding: var(--spacing-2xl) 0;
    background-color: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.about-image {
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-photo {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto;
    border: 4px solid var(--accent-primary);
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.about-photo:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 24px rgba(59, 130, 246, 0.3);
}

.image-placeholder {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
}

.about-text p {
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
    line-height: 1.8;
}

/* ============================================
   Skills Section
   ============================================ */
.skills {
    padding: var(--spacing-2xl) 0;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    align-items: start;
}

.skill-category {
    background-color: var(--bg-cards);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border: 1px solid var(--border);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-primary);
}

.skill-category-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--accent-primary);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--border);
}

.skill-items {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-xs);
    flex: 1;
}

.skill-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: var(--transition);
    min-height: 36px;
}

.skill-item:hover {
    background-color: var(--bg-secondary);
    transform: translateX(3px);
}

.skill-icon {
    width: 20px;
    height: 20px;
    object-fit: contain;
    opacity: 0.9;
    transition: var(--transition);
    flex-shrink: 0;
    filter: brightness(0) saturate(100%);
}

/* Apply brand colors to skill icons based on skill name */
.skill-item:has([alt="HTML5"]) .skill-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(93%) saturate(1352%) hue-rotate(344deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="CSS3"]) .skill-icon { filter: brightness(0) saturate(100%) invert(35%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="JavaScript"]) .skill-icon { filter: brightness(0) saturate(100%) invert(85%) sepia(99%) saturate(1352%) hue-rotate(344deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="React"]) .skill-icon { filter: brightness(0) saturate(100%) invert(78%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="Node.js"]) .skill-icon { filter: brightness(0) saturate(100%) invert(60%) sepia(93%) saturate(1352%) hue-rotate(100deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="Docker"]) .skill-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="Git"]) .skill-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(93%) saturate(1352%) hue-rotate(344deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="GitHub"]) .skill-icon { filter: brightness(0) saturate(100%); }
.skill-item:has([alt="Python"]) .skill-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(93%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="PHP"]) .skill-icon { filter: brightness(0) saturate(100%) invert(60%) sepia(93%) saturate(1352%) hue-rotate(224deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="PostgreSQL"]) .skill-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="MySQL"]) .skill-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="SQLite"]) .skill-icon { filter: brightness(0) saturate(100%) invert(15%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="Tailwind CSS"]) .skill-icon { filter: brightness(0) saturate(100%) invert(78%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="Express"]) .skill-icon { filter: brightness(0) saturate(100%); }
.skill-item:has([alt="Deno"]) .skill-icon { filter: brightness(0) saturate(100%); }
.skill-item:has([alt="Nginx"]) .skill-icon { filter: brightness(0) saturate(100%) invert(60%) sepia(93%) saturate(1352%) hue-rotate(100deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="VS Code"]) .skill-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="Bootstrap"]) .skill-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(93%) saturate(1352%) hue-rotate(244deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="Vite"]) .skill-icon { filter: brightness(0) saturate(100%) invert(48%) sepia(99%) saturate(1352%) hue-rotate(224deg) brightness(95%) contrast(88%); }
.skill-item:has([alt="Swagger"]) .skill-icon { filter: brightness(0) saturate(100%) invert(85%) sepia(99%) saturate(1352%) hue-rotate(100deg) brightness(95%) contrast(88%); }

.skill-item:hover .skill-icon {
    opacity: 1;
    transform: scale(1.15);
}

.skill-name {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ============================================
   Projects Section
   ============================================ */
.projects {
    padding: var(--spacing-2xl) 0;
    background-color: var(--bg-secondary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: var(--spacing-md);
    align-items: start;
}

.project-card {
    background-color: var(--bg-cards);
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    position: relative;
    border-left: 3px solid transparent;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.5);
    border-color: var(--accent-primary);
    border-left-color: var(--accent-primary);
}

.project-header {
    padding: var(--spacing-sm) var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--spacing-sm);
    border-bottom: 1px solid var(--border);
}

.project-title {
    font-size: 1.4rem;
    margin: 0;
    color: var(--text-primary);
    line-height: 1.3;
    font-weight: 700;
    flex: 1;
}

.project-category {
    display: inline-block;
    padding: 3px 10px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 0.7rem;
    color: var(--accent-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
    flex-shrink: 0;
}

.project-body {
    padding: var(--spacing-sm) var(--spacing-md);
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.project-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin: 0;
}

.project-content-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
}

.project-tech-section {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    align-items: center;
}

.project-tech-label {
    font-size: 0.75rem;
    color: var(--accent-primary);
    font-weight: 600;
    margin-right: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    flex: 1;
}

.tech-badge {
    padding: 4px 10px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-weight: 500;
    transition: var(--transition);
    line-height: 1.4;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    position: relative;
}

.tech-badge .tech-icon {
    width: 16px;
    height: 16px;
    object-fit: contain;
    flex-shrink: 0;
    transition: var(--transition);
    opacity: 0.85;
}

/* Use CSS custom property for icon color */
.tech-badge {
    --tech-color: var(--text-secondary);
}

.tech-badge[data-tech-color] {
    --tech-color: attr(data-tech-color);
}

/* Apply brand colors using CSS filters - simplified approach */
.tech-badge[data-tech-color] .tech-icon {
    filter: brightness(0) saturate(100%);
}

/* Specific color filters for major technologies */
.tech-badge[data-tech-color="#E34F26"] .tech-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(93%) saturate(1352%) hue-rotate(344deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#1572B6"] .tech-icon { filter: brightness(0) saturate(100%) invert(35%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#F7DF1E"] .tech-icon { filter: brightness(0) saturate(100%) invert(85%) sepia(99%) saturate(1352%) hue-rotate(344deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#61DAFB"] .tech-icon { filter: brightness(0) saturate(100%) invert(78%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#339933"] .tech-icon { filter: brightness(0) saturate(100%) invert(60%) sepia(93%) saturate(1352%) hue-rotate(100deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#2496ED"] .tech-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#06B6D4"] .tech-icon { filter: brightness(0) saturate(100%) invert(78%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#7952B3"] .tech-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(93%) saturate(1352%) hue-rotate(244deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#3776AB"] .tech-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(93%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#F05032"] .tech-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(93%) saturate(1352%) hue-rotate(344deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#007ACC"] .tech-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#009639"] .tech-icon { filter: brightness(0) saturate(100%) invert(60%) sepia(93%) saturate(1352%) hue-rotate(100deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#777BB4"] .tech-icon { filter: brightness(0) saturate(100%) invert(60%) sepia(93%) saturate(1352%) hue-rotate(224deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#239120"] .tech-icon { filter: brightness(0) saturate(100%) invert(60%) sepia(93%) saturate(1352%) hue-rotate(100deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#85EA2D"] .tech-icon { filter: brightness(0) saturate(100%) invert(85%) sepia(99%) saturate(1352%) hue-rotate(100deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#316192"] .tech-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#4479A1"] .tech-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#5C2D91"] .tech-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(93%) saturate(1352%) hue-rotate(244deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#217346"] .tech-icon { filter: brightness(0) saturate(100%) invert(60%) sepia(93%) saturate(1352%) hue-rotate(100deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#8B5CF6"] .tech-icon { filter: brightness(0) saturate(100%) invert(37%) sepia(93%) saturate(1352%) hue-rotate(244deg) brightness(95%) contrast(88%); }
.tech-badge[data-tech-color="#003B57"] .tech-icon { filter: brightness(0) saturate(100%) invert(15%) sepia(99%) saturate(1352%) hue-rotate(181deg) brightness(95%) contrast(88%); }

.tech-badge:hover {
    background-color: rgba(59, 130, 246, 0.1);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: translateY(-1px);
}

.tech-badge:hover .tech-icon {
    opacity: 1;
    transform: scale(1.1);
}

.project-features {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 4px;
}

.project-features li {
    padding: 4px 0 4px 16px;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.5;
    transition: var(--transition);
}

.project-features li::before {
    content: '•';
    position: absolute;
    left: 4px;
    color: var(--accent-primary);
    font-weight: 700;
    font-size: 1rem;
}

.project-features li:hover {
    color: var(--text-primary);
}

.project-footer {
    padding: var(--spacing-xs) var(--spacing-md) var(--spacing-sm);
    border-top: 1px solid var(--border);
    background-color: var(--bg-secondary);
    margin-top: auto;
}

.project-links {
    display: flex;
    gap: var(--spacing-xs);
}

.project-link {
    flex: 1;
    padding: 8px var(--spacing-sm);
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border: none;
    border-radius: 6px;
    color: white;
    font-size: 0.85rem;
    font-weight: 600;
    transition: var(--transition);
    text-align: center;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    text-decoration: none;
}

.project-link span {
    font-size: 0.9rem;
}

.project-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.project-link:hover::before {
    left: 100%;
}

.project-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(59, 130, 246, 0.4);
}

.project-link:active {
    transform: translateY(0);
}

/* ============================================
   Education Section
   ============================================ */
.education {
    padding: var(--spacing-2xl) 0;
    background-color: var(--bg-secondary);
}

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

.education-item {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    position: relative;
}

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

.education-date {
    font-weight: 600;
    color: var(--accent-primary);
    font-size: 1rem;
    line-height: 1.4;
}

.education-title {
    font-size: 1.35rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    line-height: 1.3;
}

.education-institution {
    color: var(--accent-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    font-size: 0.95rem;
}

.education-description {
    margin-bottom: var(--spacing-xs);
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* ============================================
   Experience Section
   ============================================ */
.experience {
    padding: var(--spacing-2xl) 0;
}

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

.experience-item {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
    position: relative;
}

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

.experience-date {
    font-weight: 600;
    color: var(--accent-primary);
    font-size: 1rem;
    line-height: 1.4;
}

.experience-title {
    font-size: 1.35rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    line-height: 1.3;
}

.experience-company {
    color: var(--accent-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    font-size: 0.95rem;
}

.experience-description {
    margin-bottom: var(--spacing-xs);
    font-size: 0.95rem;
    line-height: 1.6;
}

.experience-list {
    list-style: none;
    margin-left: 0;
    margin-bottom: 0;
    margin-top: var(--spacing-xs);
}

.experience-list li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-sm);
    position: relative;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.experience-list li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-size: 0.8rem;
}

.experience-note {
    font-style: italic;
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
}

/* ============================================
   Languages Section
   ============================================ */
.languages {
    padding: var(--spacing-2xl) 0;
    background-color: var(--bg-secondary);
}

.languages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    max-width: 900px;
    margin: 0 auto;
}

.language-item {
    background-color: var(--bg-cards);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.language-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background-color: var(--accent-primary);
    opacity: 0;
    transition: var(--transition);
}

.language-item[data-level="C2"]::before {
    background-color: #10b981;
}

.language-item[data-level="C1"]::before {
    background-color: #3b82f6;
}

.language-item[data-level="B2"]::before {
    background-color: #f59e0b;
}

.language-item[data-level="A2"]::before {
    background-color: #6b7280;
}

.language-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-primary);
}

.language-item:hover::before {
    opacity: 1;
}

.language-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.language-level {
    font-size: 0.85rem;
    padding: 4px 12px;
    border-radius: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: var(--transition);
}

.language-item[data-level="C2"] .language-level {
    background-color: rgba(16, 185, 129, 0.15);
    color: #10b981;
}

.language-item[data-level="C1"] .language-level {
    background-color: rgba(59, 130, 246, 0.15);
    color: #3b82f6;
}

.language-item[data-level="B2"] .language-level {
    background-color: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
}

.language-item[data-level="A2"] .language-level {
    background-color: rgba(107, 114, 128, 0.15);
    color: #9ca3af;
}

.language-item:hover .language-level {
    transform: scale(1.05);
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
    padding: var(--spacing-2xl) 0;
    background-color: var(--bg-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.contact-text {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
}

.social-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background-color: var(--bg-cards);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    transition: var(--transition);
    color: var(--text-primary);
}

.social-link:hover {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
    transform: translateX(5px);
}

.social-icon {
    width: 24px;
    height: 24px;
    object-fit: contain;
    opacity: 0.85;
    transition: var(--transition);
    filter: brightness(1.1);
}

.social-link:hover .social-icon {
    opacity: 1;
    transform: scale(1.1);
    filter: brightness(1.2);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    padding: var(--spacing-sm);
    background-color: var(--bg-cards);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition);
}

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

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

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: var(--spacing-lg) 0;
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border);
}

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

.back-to-top {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--accent-primary);
    color: white;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.back-to-top:hover {
    background-color: var(--hover-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (min-width: 1200px) {
    .projects-grid {
        grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    }
    
    .project-features {
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    }
}

@media (max-width: 1024px) {
    .nav-menu {
        gap: var(--spacing-sm);
    }
    
    .nav-link {
        font-size: 0.9rem;
        padding: var(--spacing-xs);
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .experience-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .experience-date {
        font-size: 0.95rem;
    }
    
    .education-item {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .education-date {
        font-size: 0.95rem;
    }
    
    .languages-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .skill-items {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
    
    .project-features {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .nav-container {
        padding: var(--spacing-sm);
        flex-wrap: nowrap;
    }
    
    .nav-logo {
        width: 45px;
        height: 45px;
        flex-shrink: 0;
    }
    
    .logo-img {
        height: 28px;
    }
    
    .nav-right {
        gap: var(--spacing-xs);
        flex-shrink: 0;
    }
    
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-primary);
        width: 100%;
        text-align: center;
        transition: 0.3s ease;
        box-shadow: var(--shadow-lg);
        border-top: 1px solid var(--border);
        padding: var(--spacing-md) 0;
        z-index: 999;
        max-height: calc(100vh - 70px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-item {
        width: 100%;
        padding: 0;
    }
    
    .nav-link {
        display: block;
        width: 100%;
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 1rem;
    }
    
    .nav-toggle {
        display: flex;
        order: 3;
        margin-left: var(--spacing-xs);
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .language-selector-desktop {
        display: none;
    }
    
    .language-selector-mobile {
        display: flex;
        justify-content: center;
        width: 100%;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .nav-item-lang {
        display: block;
        width: 100%;
        padding: var(--spacing-sm) 0;
        border-top: 1px solid var(--border);
        margin-top: var(--spacing-xs);
    }
    
    .lang-dropdown {
        width: 100%;
    }
    
    .lang-dropdown-btn {
        width: 100%;
        justify-content: center;
        padding: var(--spacing-sm);
        font-size: 0.9rem;
    }
    
    .lang-dropdown-menu {
        right: auto;
        left: 50%;
        transform: translateX(-50%) translateY(-10px);
        min-width: 180px;
        max-width: calc(100vw - 2rem);
    }
    
    .lang-dropdown-menu.show {
        transform: translateX(-50%) translateY(0);
    }
    
    .lang-option {
        padding: var(--spacing-sm);
        font-size: 0.9rem;
    }
    
    .hero-name {
        font-size: 2.5rem;
    }
    
    .hero-title {
        font-size: 1.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .skill-items {
        grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    }
    
    .project-title {
        font-size: 1.25rem;
    }
    
    .project-header {
        padding: var(--spacing-xs) var(--spacing-sm);
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-xs);
    }
    
    .project-body {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .project-footer {
        padding: var(--spacing-xs) var(--spacing-sm) var(--spacing-xs);
    }
    
    .project-tech-section {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .project-tech-label {
        margin-bottom: 4px;
    }
    
    .project-features {
        grid-template-columns: 1fr;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .education-item {
        grid-template-columns: 1fr;
    }
    
    .languages-grid {
        grid-template-columns: 1fr;
    }
    
    .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .nav-logo {
        width: 40px;
        height: 40px;
    }
    
    .logo-img {
        height: 24px;
    }
    
    .nav-toggle {
        padding: 4px;
    }
    
    .nav-toggle span {
        width: 22px;
        height: 2px;
    }
    
    .nav-menu {
        top: 60px;
        padding: var(--spacing-sm) 0;
    }
    
    .nav-link {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.95rem;
    }
    
    .lang-dropdown-btn {
        font-size: 0.85rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .lang-dropdown-menu {
        min-width: 160px;
    }
    
    .hero-name {
        font-size: 2rem;
    }
    
    .about-photo {
        width: 200px;
        height: 200px;
    }
    
    .image-placeholder {
        width: 200px;
        height: 200px;
    }
}