:root {
    --bg-color: #050815;
    --text-primary: #eaf2ff;
    --text-secondary: #a4bde2;
    --accent-primary: #00c7ff;
    --accent-secondary: #6763ff;
    --glass-bg: rgba(10, 15, 40, 0.5);
    --glass-border: rgba(255, 255, 255, 0.1);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --transition-speed: 0.3s;
    --border-radius: 12px;
}

/* --- Base Styles & Reset --- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-secondary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

.background-gradient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 10% 20%, var(--accent-secondary), transparent 40%),
                radial-gradient(circle at 90% 80%, var(--accent-primary), transparent 40%);
    opacity: 0.15;
    filter: blur(100px);
}

/* --- General UI Elements --- */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

main {
    padding: 0 25px;
}

a {
    text-decoration: none;
    color: var(--accent-primary);
    transition: color var(--transition-speed) ease;
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
}

.section-title {
    font-size: clamp(28px, 5vw, 40px);
    font-weight: 600;
    color: var(--text-primary);
}

/* --- Navbar --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1rem 0;
    z-index: 100;
    transition: top 0.3s ease-in-out, background-color 0.3s ease;
}

.navbar.scrolled {
    background-color: rgba(5, 8, 21, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition-speed) ease;
}
.nav-links a:hover {
    color: var(--text-primary);
}

.hamburger { display: none; }

/* --- Hero Section --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: clamp(40px, 8vw, 72px);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.hero-title span { display: block; }

.hero-subtitle {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 3rem auto;
}

.cta-button {
    font-size: 1rem;
    padding: 1rem 2rem;
    border: 1px solid var(--accent-primary);
    border-radius: var(--border-radius);
    background-color: transparent;
    color: var(--accent-primary);
    transition: background-color var(--transition-speed) ease;
}

.cta-button:hover {
    background-color: var(--accent-primary);
    color: var(--bg-color);
}

/* --- About Section --- */
.about {
    padding: 100px 0;
}
.about-card {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 50px;
    padding: 2.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}
.about-text p {
    margin-bottom: 15px;
}
.about-skills h3 {
    color: var(--text-primary);
    margin-bottom: 15px;
}
.skills-list {
    list-style: none;
    font-size: 0.9rem;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}
.skills-list li {
    background: rgba(0, 199, 255, 0.1);
    padding: 5px 12px;
    border-radius: 6px;
    color: var(--accent-primary);
}

/* --- Experience Section --- */
.experience {
    padding: 100px 0;
}
.experience-card {
    padding: 2.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}
.tab-buttons {
    display: flex;
    gap: 20px;
    border-bottom: 1px solid var(--glass-border);
    margin-bottom: 25px;
}
.tab-btn {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    padding: 15px 5px;
    cursor: pointer;
    color: var(--text-secondary);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: all var(--transition-speed) ease;
    transform: translateY(1px);
}
.tab-btn.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}
.tab-content .content-item { display: none; }
.tab-content .content-item.active { display: block; }

.content-item h3 {
    color: var(--text-primary);
    font-size: 1.4rem;
    margin-bottom: 5px;
}
.content-item .role-focus {
    color: var(--text-secondary);
    margin-bottom: 20px;
}
.content-item ul { list-style: none; }
.content-item ul li {
    position: relative;
    padding-left: 25px;
    margin-bottom: 12px;
}
.content-item ul li::before {
    content: '›';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
    font-size: 1.5rem;
    line-height: 1;
}

/* --- Projects Section --- */
.projects {
    padding: 100px 0;
}
.project-card {
    padding: 2.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}
.project-content h3 {
    color: var(--text-primary);
    font-size: 1.4rem;
    margin-bottom: 10px;
}
.project-content p {
    margin-bottom: 20px;
}
.project-skills {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 25px;
}
.project-skills li {
    background: rgba(103, 99, 255, 0.1);
    padding: 5px 12px;
    border-radius: 6px;
    color: var(--accent-secondary);
    font-size: 0.9rem;
}
.project-link {
    font-weight: 500;
}
.project-link i {
    margin-left: 5px;
    transition: transform var(--transition-speed) ease;
}
.project-link:hover i {
    transform: translateX(5px);
}

/* --- Certifications Section --- */
.certifications {
    padding: 100px 0;
}
.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}
.certification-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 1.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all var(--transition-speed) ease;
}
.certification-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
}
.cert-icon {
    font-size: 1.5rem;
    color: var(--accent-primary);
}
.certification-card h4 {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 1rem;
}

/* --- Education Section --- */
.education {
    padding: 100px 0;
}
.education-card {
    padding: 2.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    text-align: center;
}
.education-card h3 {
    color: var(--text-primary);
    font-size: 1.4rem;
}
.education-card p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
}
.education-card span {
    font-size: 0.9rem;
    color: var(--accent-secondary);
}


/* --- Contact Section --- */
.contact {
    padding: 150px 0;
    text-align: center;
}
.contact-content {
    max-width: 600px;
    margin: 0 auto;
}
.contact-title {
    font-size: clamp(32px, 5vw, 48px);
    color: var(--text-primary);
    margin-bottom: 15px;
}
.contact-text {
    margin-bottom: 40px;
    font-size: 1.1rem;
}

/* --- Footer --- */
.footer {
    padding: 2rem 0;
    text-align: center;
}
.social-links {
    display: flex;
    justify-content: center;
    gap: 25px;
    margin-bottom: 15px;
}
.social-links a {
    font-size: 1.2rem;
    color: var(--text-secondary);
    transition: color var(--transition-speed) ease, transform var(--transition-speed) ease;
}
.social-links a:hover {
    color: var(--accent-primary);
    transform: translateY(-3px);
}
.footer-text {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* --- Animations --- */
[data-fade-up] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
[data-fade-up].is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
    main { padding: 0 15px; }
    .nav-links {
        display: none;
        position: fixed;
        top: 0;
        right: 0;
        height: 100vh;
        width: min(75vw, 400px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        background: var(--bg-color);
        transform: translateX(100vw);
        transition: transform 0.3s ease-in-out;
    }
    .nav-links.active { transform: translateX(0); }
    .hamburger {
        display: flex;
        flex-direction: column;
        gap: 5px;
        z-index: 101;
        cursor: pointer;
    }
    .hamburger span {
        width: 25px;
        height: 2px;
        background-color: var(--text-primary);
        transition: all 0.3s ease-in-out;
    }
    .hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
    .hamburger.active span:nth-child(2) { opacity: 0; }
    .hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

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