* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

:root {
    --primary-color: #007aff;
    --secondary-color: #5856d6;
    --accent-color: #ff3b30;
    --success-color: #34c759;
    --warning-color: #ff9500;
    --text-primary: #000;
    --text-secondary: #666;
    --background-primary: #fff;
    --background-secondary: #f8f9fa;
    --border-color: #ddd;
    --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 30px rgba(0, 0, 0, 0.2);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

body {
    background-color: var(--background-primary);
    color: var(--text-primary);
    transition: background 0.4s, color 0.4s;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Header Styles */
header {
    border-bottom: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    z-index: 1000;
    padding: 20px 0;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-links {
    gap: 30px;
}

.nav-item {
    text-decoration: none;
    color: var(--text-primary);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    padding: 8px 0;
}

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

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

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

.toggle-btn {
    cursor: pointer;
    font-size: 18px;
    transition: transform 0.3s ease;
    color: var(--text-primary);
}

.toggle-btn:hover {
    transform: scale(1.1);
}

.mobile-menu {
    cursor: pointer;
    font-size: 20px;
}

.mobile-nav {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    display: none;
    padding: 20px 0;
}

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

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.mobile-nav-links a {
    text-decoration: none;
    color: var(--text-primary);
    font-size: 16px;
    cursor: pointer;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

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

/* Main Content */
main {
    min-height: 100vh;
}

.section {
    display: none;
    min-height: 100vh;
    animation: fadeIn 0.6s ease-in-out;
}

.section.active {
    display: block;
}

.section-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 8px 20px;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 20px;
}

/* HOME SECTION - Full Screen Hero Layout */
.home-layout {
    position: relative;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    overflow: hidden;
}

.hero-container {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 0 40px;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.floating-elements {
    position: absolute;
    width: 100%;
    height: 100%;
}

.float-element {
    position: absolute;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}

.float-element:nth-child(1) {
    width: 80px;
    height: 80px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.float-element:nth-child(2) {
    width: 120px;
    height: 120px;
    top: 60%;
    right: 10%;
    animation-delay: 2s;
}

.float-element:nth-child(3) {
    width: 60px;
    height: 60px;
    bottom: 20%;
    left: 20%;
    animation-delay: 4s;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px) rotate(0deg);
    }

    50% {
        transform: translateY(-20px) rotate(180deg);
    }
}

.hero-content-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    max-width: 1200px;
    width: 100%;
    z-index: 2;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 30px;
}

.title-line {
    display: block;
}

.highlight {
    background: linear-gradient(45deg, #ff6b6b, #feca57);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 50px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: #feca57;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-actions {
    display: flex;
    gap: 20px;
}

.btn-primary-custom {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border: none;
    padding: 15px 30px;
    border-radius: 50px;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn-primary-custom:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-secondary-custom {
    background: transparent;
    border: 2px solid white;
    padding: 15px 30px;
    border-radius: 50px;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

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

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.code-preview {
    background: rgba(0, 0, 0, 0.8);
    border-radius: var(--border-radius);
    padding: 20px;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 14px;
    box-shadow: var(--shadow-heavy);
    max-width: 400px;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #333;
}

.code-dots {
    display: flex;
    gap: 6px;
}

.code-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #ff5f56;
}

.code-dots span:nth-child(2) {
    background: #ffbd2e;
}

.code-dots span:nth-child(3) {
    background: #27ca3f;
}

.code-title {
    color: #ccc;
    font-size: 12px;
}

.code-line {
    margin-bottom: 8px;
    color: #ccc;
}

.keyword {
    color: #ff79c6;
}

.variable {
    color: #8be9fd;
}

.property {
    color: #50fa7b;
}

.string {
    color: #f1fa8c;
}

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: white;
    opacity: 0.7;
}

.scroll-text {
    font-size: 14px;
    margin-bottom: 10px;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid white;
    border-bottom: 2px solid white;
    transform: rotate(45deg);
    margin: 0 auto;
    animation: bounce 2s infinite;
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0) rotate(45deg);
    }

    40% {
        transform: translateY(-10px) rotate(45deg);
    }

    60% {
        transform: translateY(-5px) rotate(45deg);
    }
}

/* ABOUT SECTION - Split Screen Layout */
.about-layout {
    background: var(--background-primary);
    padding: 100px 0;
}

.about-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.about-left {
    position: relative;
}

.about-image-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.about-image {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 2;
}

.profile-placeholder {
    font-size: 80px;
    color: white;
}

.about-decorations {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.decoration-circle {
    position: absolute;
    width: 100px;
    height: 100px;
    border: 3px solid var(--primary-color);
    border-radius: 50%;
    top: -20px;
    right: -20px;
    opacity: 0.3;
}

.decoration-square {
    position: absolute;
    width: 80px;
    height: 80px;
    background: var(--accent-color);
    bottom: -20px;
    left: -20px;
    opacity: 0.2;
    border-radius: var(--border-radius);
}

.about-content {
    padding: 40px 0;
}

.about-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 30px;
    line-height: 1.2;
}

.about-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.about-highlights {
    margin-bottom: 40px;
}

.highlight-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 30px;
}

.highlight-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    flex-shrink: 0;
}

.highlight-content h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.highlight-content p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.about-actions {
    display: flex;
    align-items: center;
    gap: 30px;
}

.download-cv {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.download-cv:hover {
    color: var(--secondary-color);
}

/* SKILLS SECTION - Interactive Dashboard Layout */
.skills-layout {
    background: var(--background-secondary);
    padding: 100px 0;
}

.skills-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.skills-header {
    text-align: center;
    margin-bottom: 80px;
}

.skills-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

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

.skills-dashboard {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 40px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    overflow: hidden;
}

.skills-sidebar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 40px 0;
}

.category-item {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px 30px;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

.category-item:hover,
.category-item.active {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.category-item i {
    font-size: 18px;
}

.skills-content {
    padding: 40px;
}

.skill-group {
    display: none;
}

.skill-group.active {
    display: block;
}

.skill-item {
    margin-bottom: 30px;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.skill-name {
    font-weight: 600;
    font-size: 1.1rem;
}

.skill-level {
    color: var(--primary-color);
    font-weight: 600;
}

.skill-bar {
    height: 8px;
    background: #e9ecef;
    border-radius: 4px;
    overflow: hidden;
}



/* PROJECTS SECTION - Portfolio Grid Layout */
.projects-layout {
    background: var(--background-primary);
    padding: 100px 0;
}

.projects-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.projects-header {
    text-align: center;
    margin-bottom: 80px;
}

.projects-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 40px;
}

.project-filters {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.filter-btn {
    background: transparent;
    border: 2px solid var(--border-color);
    padding: 10px 25px;
    border-radius: 25px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}

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

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

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

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-medium);
}

.project-card.featured {
    grid-column: span 2;
}

.project-image {
    position: relative;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.project-placeholder {
    font-size: 60px;
    color: white;
    opacity: 0.8;
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-links {
    display: flex;
    gap: 20px;
}

.project-link {
    width: 50px;
    height: 50px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.project-link:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-light);
}

.project-content {
    padding: 30px;
}

.project-category {
    color: var(--primary-color);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.project-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 15px;
    line-height: 1.3;
}

.project-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.project-tech span {
    background: var(--background-secondary);
    padding: 6px 12px;
    border-radius: 15px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* CERTIFICATES SECTION - Achievement Gallery Layout */
.certificates-layout {
    background: var(--background-secondary);
    padding: 100px 0;
}

.certificates-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.certificates-header {
    text-align: center;
    margin-bottom: 80px;
}

.certificates-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.certificates-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.certificate-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.certificate-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

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

.certificate-badge {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    color: white;
    font-size: 30px;
}

.certificate-content h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 10px;
    line-height: 1.3;
}

.certificate-issuer {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 5px;
}

.certificate-date {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.certificate-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
    margin-bottom: 20px;
}

.certificate-skills span {
    background: var(--background-secondary);
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.certificate-verification {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--success-color);
    font-weight: 600;
    font-size: 0.9rem;
}

.certificate-verification i {
    font-size: 16px;
}

/* EXPERIENCE SECTION - Professional Timeline Layout */
.experience-layout {
    background: var(--background-primary);
    padding: 100px 0;
}

.experience-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 40px;
}

.experience-header {
    text-align: center;
    margin-bottom: 80px;
}

.experience-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.experience-timeline {
    position: relative;
    padding-left: 40px;
}

.timeline-line {
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
}

.experience-item {
    position: relative;
    margin-bottom: 60px;
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 40px;
    align-items: flex-start;
}

.experience-date {
    text-align: right;
    padding-right: 20px;
}

.experience-date .year {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.experience-date .duration {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.experience-marker {
    position: absolute;
    left: -28px;
    top: 10px;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 4px solid white;
    box-shadow: 0 0 0 4px var(--primary-color);
}

.experience-content {
    background: white;
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    margin-left: 20px;
}

.experience-company h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.company-name {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 5px;
}

.location {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.experience-description p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}

.achievements {
    list-style: none;
    margin-bottom: 25px;
}

.achievements li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 10px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.achievements li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

.experience-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.experience-tech span {
    background: var(--background-secondary);
    padding: 6px 12px;
    border-radius: 15px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ARTICLES SECTION - Magazine Layout */
.articles-layout {
    background: var(--background-secondary);
    padding: 100px 0;
}

.articles-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.articles-header {
    text-align: center;
    margin-bottom: 80px;
}

.articles-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

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

.articles-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 30px;
}

.article-card {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: var(--transition);
}

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

.article-card.featured {
    grid-row: span 2;
}

.article-image {
    position: relative;
    height: 200px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
}

.article-card.featured .article-image {
    height: 300px;
}

.article-category {
    position: absolute;
    top: 20px;
    left: 20px;
    background: rgba(255, 255, 255, 0.9);
    padding: 6px 15px;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.article-placeholder {
    font-size: 60px;
    color: white;
    opacity: 0.8;
}

.article-content {
    padding: 25px;
}

.article-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 15px;
    line-height: 1.3;
}

.article-card.featured .article-title {
    font-size: 1.6rem;
}

.article-excerpt {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
}

.article-meta {
    margin-bottom: 20px;
}

.article-author {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.author-avatar {
    width: 35px;
    height: 35px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 14px;
}

.article-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.article-stats span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.article-tags span {
    background: var(--background-secondary);
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* CONTACT SECTION - Contact Form Layout */
.contact-layout {
    background: var(--background-primary);
    padding: 100px 0;
}

.contact-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.contact-header {
    text-align: center;
    margin-bottom: 80px;
}

.contact-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
}

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

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 80px;
    align-items: flex-start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 25px;
    background: var(--background-secondary);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.contact-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-light);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    flex-shrink: 0;
}

.contact-details h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.contact-details p {
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.contact-details a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.contact-details a:hover {
    color: var(--secondary-color);
}

.contact-form-wrapper {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

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

.form-group label {
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

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

/* Footer */
.main-footer {
    background: var(--text-primary);
    color: white;
    padding: 50px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.footer-logo {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 15px;
}

.footer-left p {
    color: rgba(255, 255, 255, 0.7);
    max-width: 300px;
}

.footer-right {
    text-align: right;
}

.social-links {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
    justify-content: flex-end;
}

.social-links a {
    width: 45px;
    height: 45px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-decoration: none;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.footer-right p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

/* Dark Mode */
.dark-mode {
    --text-primary: #fff;
    --text-secondary: #ccc;
    --background-primary: #000;
    --background-secondary: #1a1a1a;
    --border-color: #333;
}

.dark-mode header {
    background: rgba(0, 0, 0, 0.95);
    border-bottom-color: var(--border-color);
}

.dark-mode .mobile-nav {
    background: rgba(0, 0, 0, 0.95);
    border-bottom-color: var(--border-color);
}

.dark-mode .about-layout,
.dark-mode .projects-layout,
.dark-mode .experience-layout,
.dark-mode .contact-layout {
    background: var(--background-primary);
}

.dark-mode .skills-layout,
.dark-mode .certificates-layout,
.dark-mode .articles-layout {
    background: var(--background-secondary);
}

.dark-mode .skills-dashboard,
.dark-mode .project-card,
.dark-mode .certificate-card,
.dark-mode .experience-content,
.dark-mode .article-card,
.dark-mode .contact-form-wrapper {
    background: var(--background-secondary);
    color: var(--text-primary);
}

.dark-mode .contact-item {
    background: #2a2a2a;
}

/* Animations */
@keyframes fadeIn {
    0% {
        opacity: 0;
        transform: translateY(30px);
    }

    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content-wrapper {
        grid-template-columns: 1fr;
        gap: 50px;
        text-align: center;
    }

    .about-container {
        grid-template-columns: 1fr;
        gap: 50px;
        text-align: center;
    }

    .skills-dashboard {
        grid-template-columns: 1fr;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 50px;
    }

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

    .experience-item {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .experience-date {
        text-align: left;
        padding-right: 0;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .section-badge {
        font-size: 12px;
        padding: 6px 15px;
    }

    .about-title,
    .skills-title,
    .projects-title,
    .certificates-title,
    .experience-title,
    .articles-title,
    .contact-title {
        font-size: 2rem;
    }

    .hero-stats {
        gap: 20px;
    }

    .hero-actions {
        flex-direction: column;
        gap: 15px;
    }

    .btn-primary-custom,
    .btn-secondary-custom {
        width: 100%;
        justify-content: center;
    }

    .about-actions {
        flex-direction: column;
        gap: 20px;
        align-items: center;
    }

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

    .project-card.featured {
        grid-column: span 1;
    }

    .certificates-gallery {
        grid-template-columns: 1fr;
    }

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

    .experience-timeline {
        padding-left: 20px;
    }

    .experience-content {
        margin-left: 0;
    }

    .timeline-line {
        left: 10px;
    }

    .experience-marker {
        left: 2px;
    }
}

@media (max-width: 576px) {

    .hero-container,
    .about-container,
    .skills-container,
    .projects-container,
    .certificates-container,
    .experience-container,
    .articles-container,
    .contact-container {
        padding: 0 20px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .stat-number {
        font-size: 2rem;
    }

    .code-preview {
        max-width: 300px;
        font-size: 12px;
    }

    .about-image {
        width: 250px;
        height: 250px;
    }

    .profile-placeholder {
        font-size: 60px;
    }

    .skills-dashboard {
        border-radius: 0;
        margin: 0 -20px;
    }

    .skills-sidebar {
        padding: 20px 0;
    }

    .category-item {
        padding: 15px 20px;
    }

    .skills-content {
        padding: 20px;
    }

    .project-filters {
        gap: 10px;
    }

    .filter-btn {
        padding: 8px 15px;
        font-size: 0.9rem;
    }

    .certificate-card,
    .experience-content,
    .article-card .article-content,
    .contact-form-wrapper {
        padding: 25px 20px;
    }

    .contact-item {
        padding: 20px;
    }

    .footer-content {
        flex-direction: column;
        gap: 30px;
        text-align: center;
    }

    .footer-right {
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }
}