:root {
    --black: #000000;
    --white: #ffffff;
    --gray-100: #f5f5f5;
    --gray-200: #e5e5e5;
    --gray-300: #d4d4d4;
    --gray-400: #a3a3a3;
    --gray-500: #737373;
    --gray-600: #525252;
    --gray-700: #404040;
    --gray-800: #262626;
    --gray-900: #171717;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--white);
    color: var(--black);
    line-height: 1.6;
    overflow-x: hidden;
    cursor: none;
}

.custom-cursor {
    width: 20px;
    height: 20px;
    background-color: transparent;
    border: 2px solid var(--black);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    transition: all 0.15s ease;
    transform-origin: center;
}

.cursor-follower {
    width: 8px;
    height: 8px;
    background-color: var(--black);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: 9998;
    transition: transform 0.2s cubic-bezier(0.75, -0.5, 0.25, 1.5);
}

.page-loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--white);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loader.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
}

.loader-text {
    font-size: 4rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    animation: fadeInOut 1.5s ease-in-out infinite;
}

@keyframes fadeInOut {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--gray-200);
    transition: transform 0.3s ease;
}

.navbar.hidden {
    transform: translateY(-100%);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--black);
    text-decoration: none;
    letter-spacing: 0.1em;
    white-space: nowrap;
    display: inline-block;
    text-transform: uppercase;
}

.logo .full-name {
    display: inline;
    max-width: 0;
    opacity: 0;
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.logo.expanded .full-name {
    max-width: 150px;
    opacity: 1;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 3rem;
}

.nav-link {
    color: var(--black);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    position: relative;
    transition: all 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--black);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateX(-50%);
}

.nav-link:hover {
    transform: translateY(-2px);
}

.nav-link:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background-color: var(--black);
    transition: all 0.3s ease;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 8rem 0;
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

section.visible {
    opacity: 1;
    transform: translateY(0);
}

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 6rem;
    position: relative;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
    align-items: center;
}

.hero-text {
    opacity: 0;
    animation: fadeInUp 1s ease forwards;
    animation-delay: 0.5s;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: 5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.hero-title .line {
    display: block;
    overflow: hidden;
}

.hero-subtitle {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 2rem;
    color: var(--gray-600);
}

.hero-subtitle .line {
    display: block;
}

.hero-description {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--gray-600);
    margin-bottom: 3rem;
    max-width: 600px;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
}

.btn {
    padding: 1rem 2.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    border: 2px solid var(--black);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-block;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background-color: var(--black);
    transform: translate(-50%, -50%);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: -1;
    border-radius: 50%;
}

.btn:hover::before {
    width: 300%;
    height: 300%;
}

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

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

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

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

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

.hero-image {
    opacity: 0;
    animation: fadeInUp 1s ease forwards;
    animation-delay: 0.8s;
}

.image-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 120%;
}

.profile-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border: 1px solid var(--gray-300);
    transition: transform 0.3s ease;
}

.profile-image:hover {
    transform: scale(1.02);
}

.scroll-indicator {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    opacity: 0;
    animation: fadeIn 1s ease forwards;
    animation-delay: 1.5s;
}

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

.scroll-indicator span {
    font-size: 0.85rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 60px;
    background-color: var(--black);
    animation: scrollLine 1.5s ease-in-out infinite;
}

@keyframes scrollLine {
    0%, 100% { transform: scaleY(0.5); opacity: 0.3; }
    50% { transform: scaleY(1); opacity: 1; }
}

.section-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 4rem;
    letter-spacing: -0.02em;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--black);
}

.about-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 4rem;
}

.about-text {
    font-size: 1.1rem;
    line-height: 1.9;
    color: var(--gray-700);
}

.about-paragraph {
    margin-bottom: 1.5rem;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.stat-item {
    border-left: 2px solid var(--black);
    padding-left: 2rem;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.timeline {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    padding-bottom: 4rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 2px;
    background-color: var(--black);
}

.timeline::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    height: 100px;
    width: 2px;
    background: linear-gradient(to bottom, var(--black), transparent);
}

.timeline-item {
    position: relative;
    padding-left: 4rem;
    margin-bottom: 4rem;
}

.timeline-dot {
    position: absolute;
    left: -6px;
    top: 0;
    width: 14px;
    height: 14px;
    background-color: var(--black);
    border-radius: 50%;
    border: 3px solid var(--white);
}

@keyframes dotAppear {
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.timeline-date {
    font-size: 0.9rem;
    color: var(--gray-500);
    margin-bottom: 0.5rem;
    letter-spacing: 0.05em;
}

.timeline-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

.timeline-company {
    font-size: 1.1rem;
    color: var(--gray-600);
    margin-bottom: 1rem;
}

.timeline-description {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--gray-700);
}

.education {
    background-color: var(--gray-100);
}

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

.certification-card {
    background-color: var(--white);
    padding: 2.5rem;
    border: 1px solid var(--gray-300);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    opacity: 0;
    transform: scale(0.9);
}

.certification-card.animate-in {
    animation: scaleIn 0.6s ease-out forwards;
}

@keyframes scaleIn {
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.certification-card::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 0 50px 50px;
    border-color: transparent transparent var(--black) transparent;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
}

.certification-card:hover {
    transform: translateY(-10px) scale(1.03);
    border-color: var(--black);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
}

.certification-card:hover::after {
    opacity: 1;
}

.certification-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.certification-issuer {
    font-size: 1rem;
    color: var(--gray-600);
    margin-bottom: 0.5rem;
}

.certification-date {
    font-size: 0.9rem;
    color: var(--gray-500);
}

.achievements {
    background-color: var(--gray-100);
}

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

.achievement-card {
    background-color: var(--white);
    padding: 2.5rem;
    border: 1px solid var(--gray-300);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    opacity: 0;
    transform: translateX(-30px);
}

.achievement-card.animate-in {
    animation: slideInLeft 0.6s ease-out forwards;
}

@keyframes slideInLeft {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.achievement-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 0;
    background-color: var(--black);
    transition: height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.achievement-card:hover {
    transform: translateX(10px);
    border-color: var(--black);
    box-shadow: -10px 10px 30px rgba(0, 0, 0, 0.1);
}

.achievement-card:hover::before {
    height: 100%;
}

.achievement-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.achievement-description {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--gray-700);
}

.soft-skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.soft-skill-item {
    padding: 2rem;
    border: 1px solid var(--gray-300);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(30px) rotate(-5deg);
}

.soft-skill-item.animate-in {
    animation: rotateIn 0.6s ease-out forwards;
}

@keyframes rotateIn {
    to {
        opacity: 1;
        transform: translateY(0) rotate(0deg);
    }
}

.soft-skill-item::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background-color: var(--black);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: -1;
}

.soft-skill-item:hover {
    transform: translateY(-10px) rotate(2deg);
    border-color: var(--black);
    color: var(--white);
}

.soft-skill-item:hover::before {
    width: 300%;
    height: 300%;
}

.soft-skill-item:hover h3,
.soft-skill-item:hover p {
    color: var(--white);
}

.soft-skill-item h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.soft-skill-item p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--gray-600);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
}

.skill-category {
    border: 1px solid var(--gray-300);
    padding: 2.5rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(30px);
}

.skill-category.animate-in {
    animation: fadeInUp 0.6s ease-out forwards;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.skill-category::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background-color: var(--black);
    transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: -1;
}

.skill-category:hover {
    transform: translateY(-10px);
    border-color: var(--black);
    color: var(--white);
}

.skill-category:hover::before {
    left: 0;
}

.skill-category:hover .skill-category-title,
.skill-category:hover .skill-item {
    color: var(--white);
}

.skill-category-title {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--gray-300);
}

.skill-list {
    list-style: none;
}

.skill-item {
    font-size: 1rem;
    padding: 0.7rem 0;
    color: var(--gray-700);
    position: relative;
    padding-left: 1.5rem;
}

.skill-item::before {
    content: '—';
    position: absolute;
    left: 0;
    color: var(--gray-400);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 3rem;
}

.project-card {
    border: 1px solid var(--gray-300);
    padding: 3rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.project-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background-color: var(--black);
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-card:hover {
    transform: translateY(-15px) scale(1.02);
    border-color: var(--black);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.project-card:hover::after {
    width: 100%;
}

.project-card:hover .project-number {
    transform: scale(1.2);
    color: var(--black);
}

.project-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--gray-200);
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.project-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.project-description {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--gray-700);
    margin-bottom: 1.5rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    margin-bottom: 2rem;
}

.tech-tag {
    font-size: 0.85rem;
    padding: 0.4rem 1rem;
    border: 1px solid var(--gray-300);
    color: var(--gray-700);
}

.project-link {
    font-size: 1rem;
    font-weight: 500;
    color: var(--black);
    text-decoration: none;
    display: inline-block;
    position: relative;
}

.project-link::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--black);
    transition: width 0.3s ease;
}

.project-link:hover::after {
    width: 100%;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 5rem;
}

.contact-text {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 3rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.contact-label {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--gray-500);
}

.contact-value {
    font-size: 1.1rem;
    color: var(--black);
    text-decoration: none;
}

.contact-value:hover {
    text-decoration: underline;
}

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

.social-btn {
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    color: var(--white);
    background-color: var(--black);
    border: 2px solid var(--black);
    transition: all 0.3s ease;
    display: inline-block;
}

.social-btn:hover {
    background-color: var(--white);
    color: var(--black);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

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

.form-group input,
.form-group textarea {
    padding: 1rem;
    font-size: 1rem;
    font-family: inherit;
    border: 1px solid var(--gray-300);
    background-color: var(--white);
    color: var(--black);
    transition: border-color 0.3s ease;
}

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

.form-group textarea {
    resize: vertical;
}

.footer {
    background-color: var(--gray-900);
    color: var(--white);
    padding: 3rem 0;
    text-align: center;
}

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

.footer-content p {
    font-size: 0.95rem;
    color: var(--gray-400);
}

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .hero-title {
        font-size: 4rem;
    }

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

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

    .contact-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: var(--white);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2rem;
        transition: left 0.3s ease;
    }

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

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(7px, 7px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .hero-title {
        font-size: 3rem;
    }

    .hero-subtitle {
        font-size: 1.5rem;
    }

    .section-title {
        font-size: 2.5rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

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

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

    .footer-content {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }

    .contact-social {
        flex-direction: column;
    }

    .social-btn {
        text-align: center;
    }

    section {
        padding: 5rem 0;
    }

    .custom-cursor,
    .cursor-follower {
        display: none;
    }

    body {
        cursor: auto;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1.5rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.3rem;
    }

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

    .btn {
        padding: 0.8rem 2rem;
        font-size: 0.95rem;
    }
}