:root {
    --primary-color: #000000;
    --secondary-color: #ffffff;
    --accent-color: #333333;
    --text-color: #000000;
    --text-light: #666666;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;

    --font-size-small: 14px;
    --font-size-base: 16px;
    --font-size-large: 20px;
    --font-size-xl: 24px;
    --font-size-xxl: 30px;
    --font-size-hero: 43px;

    --spacing-xs: 10px;
    --spacing-sm: 20px;
    --spacing-md: 30px;
    --spacing-lg: 50px;
    --spacing-xl: 100px;

    --border-radius: 8px;
    --border-radius-large: 50%;
}

[data-theme="dark"] {
    --primary-color: #ffffff;
    --secondary-color: #1A202C;
    --accent-color: #cccccc;
    --text-color: #ffffff;
    --text-light: #999999;
    --border-color: #333333;
    --shadow: 0 2px 10px rgba(255, 255, 255, 0.1);
}

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

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
    transition: background-color 0.3s ease, color 0.2s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--secondary-color);
    transition: background-color 0.3s ease, color 0.2s ease;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

a,
button,
.navbar,
.section-title,
.nav-link,
.languages {
    transition: background-color 0.3s ease, color 0.2s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

p {
    margin-bottom: var(--spacing-sm);
}

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

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

.header {
    position: relative;
    min-height: 100vh;
    color: var(--secondary-color);
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--secondary-color);
    padding: var(--spacing-xs) 0;
    box-shadow: var(--shadow);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-left: var(--spacing-xl);
    padding-right: var(--spacing-xl);
}

.navbar-brand .brand-link {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

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

.nav-menu li {
    display: flex;
    align-items: center;
}

.nav-link {
    font-size: var(--font-size-large);
    color: var(--primary-color);
    position: relative;
    padding: var(--spacing-xs) 0;
}



.nav-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 6px;
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease-in-out;
}

.nav-link:hover::after,
.nav-link.highlighted::after,
.nav-link.active::after {
    transform: scaleX(1);
}

.nav-link.active {
    font-weight: 600;
    color: var(--accent-color);
}

#projects {
    scroll-margin-top: 60px;
}

.languages {
    font-size: var(--font-size-large);
    color: var(--primary-color);
    position: relative;
    margin-left: 10%;
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
}

.languages:hover {
    opacity: 0.7;
}

.languages.active {
    font-weight: 600;
}

.hero {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    text-align: center;
    color: var(--primary-color)
}

.hero-title {
    font-size: var(--font-size-hero);
    font-weight: 700;
    white-space: nowrap;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-title span {
    display: inline;
}

.cursor-blink {
    animation: blink 1s infinite;
    display: inline-block;
    margin-left: 2px;
    font-size: var(--font-size-hero);
}

@keyframes blink {

    0%,
    50% {
        opacity: 1;
    }

    51%,
    100% {
        opacity: 0;
    }
}

.main-content {
    max-width: 1700px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    width: 100%;
}

.section-title {
    font-size: var(--font-size-xxl);
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
}

.about-section {
    padding: var(--spacing-xl) 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.about-content {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    width: 100%;
}

.about-image {
    flex-shrink: 0;
}

.profile-image {
    border-radius: var(--border-radius-large);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.profile-image:hover {
    transform: scale(1.05);
}

.about-text {
    flex: 1;
    margin-top: var(--spacing-md);
    width: 100%;
}

.about-intro {
    font-size: var(--font-size-xl);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
    color: var(--text-color);
    text-align: justify;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    margin-left: -300px;
    padding-left: 0;
    position: static;
}

.about-block {
    display: flex;
    flex-direction: column;
    width: 100%;
    text-align: left;
    margin-left: 0;
    padding-left: 0;
}

.about-subtitle {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
    margin-left: 0;
    color: var(--primary-color);
    text-align: center;
}

.about-subtitle::before {
    opacity: 0.5;
    font-weight: 400;
}

.about-toolbox,
.about-responsive,
.about-collaborate {
    font-size: var(--font-size-xl);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    width: 100%;
    text-align: justify;
}

.about-text .skills {
    margin-top: var(--spacing-lg);
    grid-column: 1 / -1;
}

.skills {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.skill-icon {
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.skill-icon:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.projects-section {
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--border-color);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}


.projects-show-more {
    text-align: center;
    margin-top: var(--spacing-lg);
}

.show-more-btn {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-large);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    min-width: 220px;
    white-space: nowrap;
    text-align: center;
    display: inline-block;
    box-sizing: border-box;
}

.show-more-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.show-more-btn:active {
    transform: translateY(0);
}

.footer {
    color: var(--secondary-color);
    padding: var(--spacing-xl) 0;
    margin-top: 0;
}

.contact-section {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.contact-section .section-title {
    color: var(--primary-color);
    padding-top: 0;
}

.contact-description {
    font-size: var(--font-size-xl);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    color: var(--primary-color);
    padding: var(--spacing-xs);
}

.social-link:hover {
    transform: scale(1.1);
    color: var(--accent-color);
}

.social-link svg {
    width: 54px;
    height: 54px;
    transition: var(--transition);
}

.social-icon {
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.social-icon:hover {
    box-shadow: 0 5px 15px rgba(255, 255, 255, 0.3);
}

.burger-menu {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 25px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.burger-line {
    width: 100%;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 3px;
    transition: var(--transition);
}

.burger-menu.active .burger-line:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.burger-menu.active .burger-line:nth-child(2) {
    opacity: 0;
}

.burger-menu.active .burger-line:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

.theme-toggle {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: var(--font-size-large);
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    color: var(--primary-color);
    margin-left: var(--spacing-sm);
    line-height: 1;
    height: auto;
    opacity: 0.8;
}

.theme-toggle:hover {
    transform: scale(1.1);
    opacity: 1;
}

.theme-icon {
    display: inline-block;
    transition: transform 0.3s ease;
    line-height: 1;
}

.theme-toggle:hover .theme-icon {
    transform: rotate(15deg);
}

.project-card {
    background: var(--secondary-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.4s ease, box-shadow 0.4s ease;
    display: flex;
    flex-direction: column;
}

.project-card.hidden-project {
    display: none;
}

.project-card.hidden-project.visible {
    display: flex;
}

.project-card:hover,
.project-card.visible:hover,
.project-card.hidden-project.visible:hover,
.projects-grid .project-card.visible:hover {
    transform: translateY(-10px) !important;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2) !important;
    transition: transform 0.4s ease, box-shadow 0.4s ease !important;
}

[data-theme="dark"] .project-card:hover,
[data-theme="dark"] .project-card.visible:hover,
[data-theme="dark"] .project-card.hidden-project.visible:hover {
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.15) !important;
}

.project-video {
    width: 100%;
    height: auto;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    cursor: default;
}
.project-title {
    font-size: var(--font-size-large);
    padding: var(--spacing-xs) var(--spacing-sm) 0;
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.project-description {
    font-size: var(--font-size-large);
    text-align: center;
    padding: 0 var(--spacing-sm) var(--spacing-sm);
    margin: 0;
    line-height: 1.4;
    flex: 1;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

.nav-link:focus,
.project-link:focus,
.social-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    }
}

.nav-link:focus:not(:focus-visible),
.project-link:focus:not(:focus-visible),
.social-link:focus:not(:focus-visible),
.burger-menu:focus:not(:focus-visible),
.show-more-btn:focus:not(:focus-visible),
.languages:focus:not(:focus-visible),
.brand-link:focus:not(:focus-visible) {
    outline: none;
}

.project-links {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-md) var(--spacing-sm);
    margin-top: auto;
    flex-shrink: 0;
}

.project-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 12px;
    border-radius: var(--border-radius);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: 2px solid var(--primary-color);
    cursor: pointer;
}

.github-btn,
.demo-btn {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.github-btn:hover,
.demo-btn:hover {
    background: var(--primary-color);
    color: var(--secondary-color);
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.github-btn:active,
.demo-btn:active {
    transform: translateY(0);
}

[data-theme="dark"] .github-btn,
[data-theme="dark"] .demo-btn {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

[data-theme="dark"] .github-btn:hover,
[data-theme="dark"] .demo-btn:hover {
    background: var(--primary-color);
    color: var(--secondary-color);
}

.project-content-link {
    display: flex;
    flex-direction: column;
    flex: 1;
    color: inherit;
    text-decoration: none;
    cursor: default;
}




@media (max-width: 1024px) {
    :root {
        --font-size-hero: 36px;
        --spacing-xl: 60px;
    }

    .navbar {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }

    .about-content {
        flex-direction: column;
        text-align: left;
    }

    .about-image {
        margin-bottom: var(--spacing-lg);
    }

    .skills {
        justify-content: flex-start;
    }

    .about-grid {
        gap: var(--spacing-md);
        margin-left: 0;
        left: 0;
        position: static;
    }

    .about-toolbox,
    .about-responsive,
    .about-collaborate {
        font-size: 15px;
    }

}

@media (max-width: 768px) {
    :root {
        --font-size-hero: 28px;
        --font-size-xxl: 24px;
        --font-size-xl: 18px;
        --spacing-xl: 40px;
    }

    .navbar {
        flex-direction: row;
        justify-content: space-between;
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .burger-menu {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 300px;
        height: 100vh;
        background-color: var(--secondary-color);
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--spacing-lg);
        transition: right 0.3s ease-in-out;
        z-index: 1000;
        padding: var(--spacing-xl) 0;
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-link {
        font-size: var(--font-size-xl);
    }

    .languages {
        margin-left: 0;
        font-size: var(--font-size-xl);
    }

    .projects-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .project-video {
        width: 100%;
        height: auto;
    }

    .social-links {
        gap: var(--spacing-md);
    }

    .theme-toggle {
        margin-left: 0;
        font-size: var(--font-size-xl);
    }

    .nav-menu .theme-toggle {
        margin: 0;
    }

    .about-image {
        display: flex;
        justify-content: center;
        width: 100%;
    }

    .about-grid {
        grid-template-columns: 1fr;
        margin-left: 0;
        left: 0;
        position: static;
        width: 100%;
    }

    .about-subtitle::before {
        content: "";
    }

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

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

    .about-toolbox,
    .about-responsive,
    .about-collaborate {
        font-size: 16px;
        text-align: center;
    }

    .contact-section {
        text-align: center;
        max-width: 100%;
        margin: 0 auto;
        padding: 0 var(--spacing-sm);
    }

    .contact-section .section-title {
        font-size: 22px;
        margin-bottom: var(--spacing-sm);
    }

    .contact-description {
        font-size: 16px;
        line-height: 1.5;
        margin-bottom: var(--spacing-md);
        padding: 0 var(--spacing-xs);
        max-width: 100%;
    }

    .projects-grid {
        display: grid;
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .projects-grid .project-card {
        width: 100%;
    }

  .project-links {
        padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-sm) var(--spacing-sm);
        min-height: auto;
    }
    
    .project-btn {
        padding: 8px 10px;
        font-size: 13px;
        min-height: auto;
    }
    
    .project-btn svg {
        width: 18px;
        height: 18px;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-hero: 24px;
        --font-size-xxl: 20px;
        --font-size-xl: 16px;
        --spacing-lg: 30px;
    }

    .main-content {
        padding: 0 var(--spacing-sm);
    }

    .nav-menu {
        width: 85%;
    }

    .nav-link {
        font-size: var(--font-size-large);
    }

    .contact-description {
        font-size: var(--font-size-large);
    }

    .hero-title {
        white-space: normal;
        flex-wrap: wrap;
    }

      .project-links {
        flex-direction: column;
        gap: 8px;
    }
    
    .project-btn {
        padding: 10px;
        width: 100%;
    }
}