html {
    font-family: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-feature-settings: 'liga', 'kern';
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    font-size: clamp(14px, 2.5vw, 18px);
}

:root {
    --primary-bg: #262626;
    --secondary-bg: #595959;
    --border-color: #808080;
    --text-primary: #f2f2f2;
    --text-secondary: #ffffff;
    --accent-color: #6a6a6a;
    --shadow: rgba(0, 0, 0, 0.3);
    --border-radius: clamp(5px, 1vw, 15px);
    --spacing-xs: clamp(0.5rem, 2vw, 1rem);
    --spacing-sm: clamp(1rem, 3vw, 1.5rem);
    --spacing-md: clamp(1.5rem, 4vw, 2rem);
    --spacing-lg: clamp(2rem, 5vw, 3rem);
    --font-size-sm: clamp(12px, 2vw, 14px);
    --font-size-md: clamp(16px, 3vw, 18px);
    --font-size-lg: clamp(18px, 4vw, 24px);
    --font-size-xl: clamp(22px, 5vw, 36px);
    --container-max-width: min(95vw, 1200px);
}

* {
    box-sizing: border-box;
}

*:focus {
    outline: 2px solid var(--text-primary);
    outline-offset: 2px;
}

/* Enhanced loading states and animations */
.loading {
    overflow: hidden;
}

.loading * {
    animation-play-state: paused;
}

.loaded section {
    animation: fadeInUp 0.6s ease-out forwards;
}

.animate-in {
    animation: fadeInUp 0.8s ease-out forwards;
}

/* Enhanced section animations */
section {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

section.animate-in {
    opacity: 1;
    transform: translateY(0);
}

/* Enhanced focus states for better accessibility */
*:focus {
    outline: 2px solid var(--text-primary);
    outline-offset: 2px;
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-bg);
    color: var(--text-primary);
    padding: 8px;
    text-decoration: none;
    z-index: 10000;
    border-radius: var(--border-radius);
}

.skip-link:focus {
    top: 6px;
}

/* Enhanced animations for individual elements */
.skill-item {
    animation: fadeInUp 0.6s ease-out forwards;
    opacity: 0;
    transform: translateY(20px);
}

.block-code {
    animation: fadeInUp 0.8s ease-out forwards;
    opacity: 0;
    transform: translateY(30px);
}

/* Smooth transitions for all interactive elements */
a, button, .skill-item, .block-code {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    margin: 0;
    padding-top: clamp(80px, 15vw, 120px);
    background: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

body.no-scroll {
    overflow: hidden;
}

hr {
    width: min(90vw, var(--container-max-width));
    color: var(--secondary-bg);
    border: none;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--secondary-bg), transparent);
    margin: var(--spacing-lg) auto;
}

.block-code hr {
    color: var(--text-primary);
    background: linear-gradient(90deg, transparent, var(--text-primary), transparent);
    margin: var(--spacing-sm) auto;
    width: 90%;
}

/* Enhanced animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideInFromLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Enhanced header with modern navigation */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(38, 38, 38, 0.95);
    backdrop-filter: blur(15px) saturate(180%);
    -webkit-backdrop-filter: blur(15px) saturate(180%);
    z-index: 1000;
    border-bottom: 1px solid var(--secondary-bg);
    animation: slideInFromLeft 0.6s ease-out;
}

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

.logo {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 1px;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

.hamburger:hover {
    background: rgba(255, 255, 255, 0.1);
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform-origin: center;
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.hamburger.active .hamburger-line:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

.main-nav {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-size: var(--font-size-md);
    font-weight: 500;
    letter-spacing: 0.5px;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

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

.nav-link:hover {
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.nav-link:focus {
    background: rgba(255, 255, 255, 0.2);
}


.btn-lang {
    color: var(--text-primary);
    background: var(--primary-bg);
    border: 2px solid var(--secondary-bg);
    border-radius: var(--border-radius);
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    font-size: var(--font-size-md);
    font-weight: 600;
    min-width: 60px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.btn-lang::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    transition: all 0.3s ease;
    transform: translate(-50%, -50%);
}

.btn-lang:hover::before {
    width: 200px;
    height: 200px;
}

.btn-lang:hover {
    border-color: var(--border-color);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow);
}

.btn-lang:active {
    transform: translateY(0);
    box-shadow: 0 2px 5px var(--shadow);
}

/* Container layouts with CSS Grid and Flexbox */
.page-section {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-md);
    animation: fadeInUp 0.6s ease-out;
}

/* Enhanced responsive breakpoints */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
        z-index: 1001;
    }
    
    .main-nav {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(38, 38, 38, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--spacing-lg);
        transform: translateX(-100%);
        transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 1000;
    }
    
    .main-nav.active {
        transform: translateX(0);
    }
    
    .nav-link {
        font-size: var(--font-size-lg);
        padding: var(--spacing-md) var(--spacing-lg);
        border-radius: var(--border-radius);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        opacity: 0;
        transform: translateY(20px);
        animation: none;
    }
    
    .main-nav.active .nav-link {
        opacity: 1;
        transform: translateY(0);
    }
    
    .main-nav.active .nav-link:nth-child(1) { animation-delay: 0.1s; }
    .main-nav.active .nav-link:nth-child(2) { animation-delay: 0.2s; }
    .main-nav.active .nav-link:nth-child(3) { animation-delay: 0.3s; }
    .main-nav.active .nav-link:nth-child(4) { animation-delay: 0.4s; }
    .main-nav.active .btn-lang { animation-delay: 0.5s; }
    
    .main-nav.active .nav-link,
    .main-nav.active .btn-lang {
        animation: fadeInUp 0.6s ease-out forwards;
    }
    
    .btn-lang {
        margin-top: var(--spacing-md);
        font-size: var(--font-size-lg);
        padding: var(--spacing-sm) var(--spacing-lg);
        min-width: 80px;
        opacity: 0;
        transform: translateY(20px);
    }
    
    body {
        padding-top: clamp(60px, 12vw, 80px);
    }
    
    .header-content {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    /* Prevent scrolling when menu is open */
    .no-scroll {
        overflow: hidden;
    }
}

@media (min-width: 769px) {
    .hamburger {
        display: none;
    }
    
    .main-nav {
        position: static;
        width: auto;
        height: auto;
        background: none;
        backdrop-filter: none;
        flex-direction: row;
        justify-content: flex-start;
        align-items: center;
        gap: var(--spacing-md);
        transform: none;
        transition: none;
    }
    
    .nav-link {
        opacity: 1;
        transform: none;
        font-size: var(--font-size-md);
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .btn-lang {
        opacity: 1;
        transform: none;
        margin-top: 0;
        font-size: var(--font-size-md);
        padding: var(--spacing-xs) var(--spacing-sm);
        min-width: 60px;
    }

    .btn-lang:hover {
        transform: translateY(-2px) scale(1.05);
    }

    .nav-link:hover {
        transform: translateY(-2px);
    }
    
    /* Desktop-only hover text change */
    .btn-lang:hover::after {
        content: attr(data-hover-text);
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        opacity: 1;
    }
    
    .btn-lang::after {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        opacity: 0;
        transition: opacity 0.3s ease;
    }
}

/* Enhanced skills section with modern grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(200px, 100%), 1fr));
    gap: var(--spacing-sm);
    justify-items: center;
    margin: var(--spacing-md) 0;
    padding: var(--spacing-sm);
}

.skill-item {
    background: linear-gradient(135deg, var(--secondary-bg), var(--accent-color));
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: center;
    font-size: var(--font-size-md);
    font-weight: 600;
    letter-spacing: 0.5px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: default;
    min-width: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.skill-item::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: rotate(-45deg);
    transition: all 0.6s ease;
    opacity: 0;
}

.skill-item:hover::before {
    opacity: 1;
    transform: rotate(-45deg) translate(50%, 50%);
}

.skill-item:hover {
    background: linear-gradient(135deg, var(--accent-color), #7a7a7a);
    border-color: #a0a0a0;
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 10px 25px var(--shadow);
}

/* Enhanced container layouts */
.container-about-me-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-md);
}

.about-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.container-about-me-info p {
    word-break: normal;
    line-height: 1.7;
    font-size: var(--font-size-md);
    letter-spacing: 0.5px;
}

.container-about-me-info p a {
    color: var(--text-primary);
    text-decoration: underline;
    text-decoration-color: var(--secondary-bg);
    text-underline-offset: 3px;
    transition: all 0.3s ease;
}

.container-about-me-info p a:hover {
    color: var(--text-secondary);
    text-decoration-color: var(--text-secondary);
    transform: scale(1.05);
}

#about-me-img {
    width: clamp(8rem, 15vw, 12rem);
    height: clamp(8rem, 15vw, 12rem);
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--secondary-bg);
    transition: all 0.3s ease;
    filter: grayscale(0.2);
}

#about-me-img:hover {
    transform: scale(1.05);
    border-color: var(--border-color);
    filter: grayscale(0);
}

/* Enhanced section headers */
.header-additional {
    text-align: center;
    margin: var(--spacing-lg) 0;
    animation: fadeIn 0.8s ease-out;
}

.title-additional {
    font-size: var(--font-size-xl);
    margin: 0;
    font-weight: 700;
    letter-spacing: 1px;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Enhanced project cards */
.container-code-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(350px, 100%), 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
    padding: var(--spacing-sm);
    max-width: var(--container-max-width);
    margin-left: auto;
    margin-right: auto;
}

.block-code-link {
    color: var(--text-primary);
    text-decoration: none;
    transition: transform 0.3s ease;
}

.block-code-link:hover {
    transform: translateY(-5px);
}

.block-code {
    background: linear-gradient(135deg, var(--secondary-bg), var(--accent-color));
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
    position: relative;
    height: 420px;
    display: flex;
    flex-direction: column;
}

.block-code::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left 0.5s ease;
}

.block-code:hover::before {
    left: 100%;
}

.block-code:hover {
    transform: scale(1.02);
    border-color: var(--border-color);
    box-shadow: 0 15px 35px var(--shadow);
}

.block-code-header {
    text-align: center;
    padding: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.2);
    flex-shrink: 0;
}

.block-code-header h2, .block-code-header h3 {
    font-size: var(--font-size-lg);
    margin: 0;
    font-weight: 600;
    line-height: 1.2;
}

.block-code-main {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    flex-grow: 1;
    min-height: 0;
    gap: var(--spacing-sm);
}

.block-code-main p {
    font-size: var(--font-size-md);
    margin: 0;
    line-height: 1.6;
}

.block-code-main p:first-child {
    flex-grow: 1;
    margin-bottom: var(--spacing-sm);
}

.block-code-main p:last-child {
    margin-top: auto;
    padding-top: var(--spacing-md);
    margin-bottom: 0;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    min-height: 24px;
}

.block-code-footer {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: rgba(0, 0, 0, 0.2);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: var(--font-size-sm);
    flex-wrap: wrap;
    flex-shrink: 0;
    margin-top: auto;
    min-height: 60px;
}

.block-code-footer span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: calc(var(--spacing-xs) * 0.5) var(--spacing-xs);
    border-radius: calc(var(--border-radius) * 0.5);
    background: rgba(255, 255, 255, 0.1);
    font-weight: 500;
    line-height: 1;
}

/* Enhanced contacts section */
.container-contacts-info {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-md);
}

.container-contacts-info address {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    font-style: normal;
}

.container-contacts-info a {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
    background: linear-gradient(135deg, var(--secondary-bg), var(--accent-color));
    border: 1px solid var(--border-color);
}

.container-contacts-info a:hover {
    color: var(--text-secondary);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px var(--shadow);
}

/* Footer enhancements */
#footer-code-main {
    text-align: center;
    margin: var(--spacing-lg) 0;
}

#footer-code-main a {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-primary);
    text-decoration: none;
    font-size: var(--font-size-lg);
    transition: all 0.3s ease;
}

#footer-code-main a:hover {
    transform: scale(1.05);
    color: var(--text-secondary);
}

#footer-code-main img {
    width: clamp(1.5rem, 4vw, 2rem);
    height: clamp(1.5rem, 4vw, 2rem);
    transition: transform 0.3s ease;
}

#footer-code-main img:hover {
    transform: rotate(360deg);
}

/* Responsive design improvements */
@media (max-width: 480px) {
    .container-about-me-info {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .about-content {
        order: 2;
    }
    
    #about-me-img {
        order: 1;
        margin: 0 auto;
    }
    
    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        gap: var(--spacing-xs);
    }
    
    .container-code-info {
        grid-template-columns: 1fr;
    }
    
    .block-code {
        height: 460px;
    }
}

@media (min-width: 481px) and (max-width: 768px) {
    .container-about-me-info {
        flex-direction: column;
        text-align: center;
    }
    
    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
    
    .block-code {
        height: 440px;
    }
}

@media (min-width: 769px) {
    .container-about-me-info {
        flex-direction: row;
        text-align: left;
    }
    
    .about-content {
        flex: 1;
    }
    
    #about-me-img {
        margin-left: var(--spacing-md);
    }
}

/* Enhanced accessibility and focus states */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary-bg: #1a1a1a;
        --secondary-bg: #2d2d2d;
        --border-color: #404040;
        --text-primary: #e0e0e0;
        --text-secondary: #ffffff;
        --accent-color: #404040;
    }
}

/* Print styles */
@media print {
    .main-header,
    .btn-lang {
        display: none;
    }
    
    body {
        padding-top: 0;
        background: white;
        color: black;
    }
    
    .block-code {
        break-inside: avoid;
        border: 1px solid #ccc;
    }
}