:root {
    --primary: #4A90E2;
    --secondary: #A0C3D2;
    --background: #F4F7F9;
    --text-color: #333333;
    --secondary-text-color: #666666;
    --card-background: #FFFFFF;
    --border-color: #E0E4E7;
    --shadow-light: rgba(0, 0, 0, 0.08);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --font-sans: 'Poppins', sans-serif;
    --font-mono: 'Roboto Mono', monospace;
    --fz-xxs: 12px;
    --fz-xs: 13px;
    --fz-sm: 14px;
    --fz-md: 16px;
    --fz-lg: 18px;
    --fz-xl: 20px;
    --fz-xxl: 24px;
    --fz-heading: 36px;
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

body {
    background-color: var(--background);
    color: var(--text-color);
    font-family: var(--font-sans);
    line-height: 1.6;
}

/* Container */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 40px;
}

@media (max-width: 1080px) {
    .container {
        padding: 0 20px;
    }
}

/* Header & Navigation */
header {
    background-color: transparent;
    border-bottom: 1px solid transparent;
    box-shadow: none;
    transition: var(--transition);
}

.transparent-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
}

.header-scrolled {
    background-color: var(--card-background);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 10px var(--shadow-light);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    position: relative;
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    color: var(--secondary-text-color);
    transition: var(--transition);
}

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

.social-links svg {
    width: 20px;
    height: 20px;
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-color);
    margin: 3px 0;
    transition: var(--transition);
    transform-origin: center;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

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

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Menu Styles */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 100%;
        background-color: var(--card-background);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: right 0.3s ease-in-out;
        box-shadow: -5px 0 15px var(--shadow-light);
    }

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

    .nav-links li {
        margin: 20px 0;
    }

    .nav-links a {
        font-size: var(--fz-xl);
        font-weight: 600;
    }

    .social-links {
        position: fixed;
        bottom: 40px;
        left: 50%;
        transform: translateX(-50%);
        z-index: 1002;
        opacity: 0;
        transition: opacity 0.3s ease;
    }

    .nav-links.active ~ .social-links {
        opacity: 1;
    }

    .container {
        padding: 0 15px;
    }
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding-top: 100px;
    text-align: left;
}

.intro-text {
    font-size: var(--fz-xl);
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 10px;
}

.hero h1 {
    font-size: clamp(48px, 6vw, 72px);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #4A90E2 0%, #A0C3D2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    -moz-background-clip: text;
    -moz-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.hero-subtext {
    max-width: 600px;
    font-size: var(--fz-lg);
    color: var(--secondary-text-color);
    margin-bottom: 40px;
}

.primary-btn {
    display: inline-flex;
    align-items: center;
    padding: 12px 24px;
    background: var(--primary);
    color: #FFF;
    text-decoration: none;
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition);
    box-shadow: 0 4px 15px var(--shadow-light);
}

.primary-btn:hover {
    background: #3B72B9;
    box-shadow: 0 6px 20px var(--shadow-medium);
    transform: translateY(-2px);
}

.primary-btn span {
    margin-left: 10px;
    transition: transform 0.3s ease;
}

.primary-btn:hover span {
    transform: translateX(5px);
}

/* General Section Styling */
section {
    padding: 80px 0;
}

@media (max-width: 768px) {
    section {
        padding: 60px 0;
    }
}

.numbered-heading {
    position: relative;
    font-size: var(--fz-xxl);
    font-weight: 600;
    margin-bottom: 50px;
    color: var(--text-color);
}

.numbered-heading::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background: var(--primary);
    margin-top: 10px;
}

/* About Section */
.about-content {
    display: flex;
    gap: 50px;
    flex-wrap: wrap;
    align-items: center;
}

.about-text {
    flex: 1;
    min-width: 300px;
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 0;
    list-style: none;
}

.skills-list li {
    background-color: var(--border-color);
    color: var(--text-color);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: var(--fz-sm);
    font-family: var(--font-sans);
    transition: var(--transition);
}

.skills-list li:hover {
    background-color: var(--primary);
    color: var(--card-background);
}

/* Experience Section */
.jobs {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin-top: 50px;
}

.job {
    background-color: var(--card-background);
    padding: 30px;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 20px var(--shadow-light);
    transition: var(--transition);
}

.job:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow-medium);
}

.job-title {
    font-size: var(--fz-xl);
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 5px;
}

.job-company {
    color: var(--primary);
    font-size: var(--fz-md);
    font-weight: 500;
}

.job-range {
    font-size: var(--fz-sm);
    color: var(--secondary-text-color);
    margin-top: 5px;
    margin-bottom: 20px;
}

.job-details ul {
    list-style-type: none;
    padding: 0;
}

.job-details li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
    font-size: var(--fz-md);
    color: var(--secondary-text-color);
}

.job-details li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary);
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    position: relative;
    margin-top: 50px;
}

@media (max-width: 768px) {
    .projects-grid {
        grid-template-columns: 1fr;
    }
}

.project {
    transition: var(--transition);
}

.project-inner {
    padding: 30px;
    border-radius: var(--border-radius);
    background-color: var(--card-background);
    box-shadow: 0 5px 20px var(--shadow-light);
    transition: var(--transition);
    height: 100%;
}

.project-inner:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow-medium);
}

.project-description {
    font-size: var(--fz-md);
    color: var(--secondary-text-color);
    margin-bottom: 20px;
}

.project-tech-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    list-style: none;
    padding: 0;
}

.project-tech-list li {
    background-color: var(--border-color);
    color: var(--text-color);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: var(--fz-xs);
    font-family: var(--font-sans);
    font-weight: 500;
    transition: var(--transition);
}

.project-tech-list li:hover {
    background-color: var(--primary);
    color: var(--card-background);
}

/* Education Section */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

@media (max-width: 768px) {
    .education-grid,
    .certificates-grid {
        grid-template-columns: 1fr;
    }
}

.education-item, .certificate {
    background-color: var(--card-background);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 20px var(--shadow-light);
    transition: var(--transition);
}

.education-item:hover, .certificate:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow-medium);
}

.education-degree, .certificate-name {
    color: var(--text-color);
    font-size: var(--fz-lg);
    font-weight: 600;
}

.education-institution, .certificate-provider {
    color: var(--primary);
    font-size: var(--fz-md);
    margin-top: 5px;
}

.education-grade {
    color: var(--secondary-text-color);
    font-size: var(--fz-sm);
    margin-top: 5px;
}

/* Footer */
footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--secondary-text-color);
    text-align: center;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Fade-in animation */
.fade-in {
    opacity: 1;
    transform: translateY(0);
}