/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
    --primary-color: #1e3a8a;
    --secondary-color: #1d4ed8;
    --accent-color: #2563eb;
    --dark-bg: #0f172a;
    --darker-bg: #020617;
    --light-bg: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #334155;
    --text-light: #cbd5e1;
    --white: #ffffff;
    --success: #047857;
    --warning: #f59e0b;
    --danger: #ef4444;
    --font-primary: 'Inter', -apple-system, blinkmacsystemfont, 'Segoe UI', sans-serif;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 1px 2px 0 rgb(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Scroll Reveal Animations */
.reveal-on-scroll {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
    transition: transform 0.8s ease, filter 0.8s ease;
}

.reveal-on-scroll.is-hidden {
    transform: translateY(40px) scale(0.98);
    filter: blur(12px);
}

@media (prefers-reduced-motion: reduce) {
    .reveal-on-scroll,
    .reveal-on-scroll.is-hidden {
        opacity: 1;
        transform: none;
        filter: none;
        transition: none;
    }
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgb(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.navbar.scrolled {
    background: rgb(15, 23, 42, 0.98);
    box-shadow: var(--shadow-lg);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
}

.nav-brand a {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--white);
    text-decoration: none;
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
}

.nav-logo {
    height: 70px;
    width: auto;
    display: block;
    transition: var(--transition);
}

.nav-brand a:hover .nav-logo {
    transform: scale(1.05);
    filter: brightness(1.1);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--secondary-color);
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: var(--white);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--white);
    margin: 3px 0;
    transition: var(--transition);
    border-radius: 3px;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, var(--dark-bg) 0%, var(--primary-color) 100%);
    overflow: hidden;
    padding-top: 80px;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 20% 50%, rgb(59, 130, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgb(96, 165, 250, 0.1) 0%, transparent 50%);
    animation: gradient-shift 15s ease infinite;
}

@keyframes gradient-shift {
    0%, 100% { opacity: 1; }

    50% { opacity: 0.8; }
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent, rgb(15, 23, 42, 0.2));
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 2rem 0;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 800;
    color: var(--white);
    margin-bottom: 1rem;
    letter-spacing: -0.03em;
    animation: fade-in-up 0.8s ease;
}

.hero-subtitle {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 1rem;
    animation: fade-in-up 0.8s ease 0.2s backwards;
}

.hero-tagline {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-light);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    animation: fade-in-up 0.8s ease 0.4s backwards;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
    animation: fade-in-up 0.8s ease 0.6s backwards;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    animation: fade-in-up 0.8s ease 0.8s backwards;
}

.btn {
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 0.5rem;
    transition: var(--transition);
    display: inline-block;
    border: 2px solid transparent;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border-color: var(--primary-color);
}

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

.social-links {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    animation: fade-in-up 0.8s ease 1s backwards;
}

.social-links a {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgb(255, 255, 255, 0.1);
    color: var(--white);
    font-size: 1.25rem;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.social-links a:hover {
    background: var(--white);
    color: var(--primary-color);
    transform: translateY(-5px);
}

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-indicator a {
    color: var(--white);
    font-size: 2rem;
    opacity: 0.7;
    transition: var(--transition);
}

.scroll-indicator a:hover {
    opacity: 1;
}

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }

    40% {
        transform: translateX(-50%) translateY(-10px);
    }

    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* ===================================
   Section Styles
   =================================== */
section {
    padding: 6rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-tag {
    display: inline-block;
    color: var(--secondary-color);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
}

.section-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.section-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

/* ===================================
   About Section
   =================================== */
.about {
    background: var(--light-bg);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.quote-box {
    background: var(--white);
    padding: 2rem;
    border-left: 4px solid var(--secondary-color);
    margin-bottom: 2rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-md);
}

.quote-icon {
    color: var(--secondary-color);
    font-size: 2rem;
    margin-bottom: 1rem;
    opacity: 0.3;
}

.quote-text {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-primary);
    margin-bottom: 0;
}

.achievements {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2.5rem 0;
}

.achievement-item {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: var(--shadow-md);
    display: flex;
    gap: 1rem;
    transition: var(--transition);
}

.achievement-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.achievement-item i {
    font-size: 2rem;
    color: var(--secondary-color);
    flex-shrink: 0;
}

.achievement-item h3 {
    color: var(--text-primary);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.achievement-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* ===================================
   Vision Section
   =================================== */
.vision {
    background: var(--white);
}

.vision-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.vision-card {
    background: var(--light-bg);
    padding: 2.5rem 2rem;
    border-radius: 0.75rem;
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
}

.vision-card:hover {
    border-color: var(--secondary-color);
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
}

.vision-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--white);
}

.vision-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.vision-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===================================
   Projects Section
   =================================== */
.projects {
    background: var(--light-bg);
}

.featured-project {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    padding: 3rem;
    border-radius: 1rem;
    margin-bottom: 4rem;
    box-shadow: var(--shadow-xl);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.project-header h3 {
    font-size: 2rem;
    font-weight: 700;
}

.project-date {
    font-size: 0.95rem;
    opacity: 0.9;
}

.project-description {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    opacity: 0.95;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.tag {
    background: rgb(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-size: 0.9rem;
    font-weight: 500;
    backdrop-filter: blur(10px);
}

.subsection-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2rem;
    text-align: center;
}

.github-projects {
    margin-bottom: 4rem;
}

.github-repos {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.loading-spinner {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.loading-spinner i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.repo-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 2px solid transparent;
    display: flex;
    flex-direction: column;
}

.repo-card:hover {
    border-color: var(--secondary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.repo-header {
    display: flex;
    align-items: start;
    gap: 1rem;
    margin-bottom: 1rem;
}

.repo-icon {
    font-size: 1.5rem;
    color: var(--secondary-color);
}

.repo-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.repo-name:hover {
    color: var(--secondary-color);
}

.repo-description {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
    flex-grow: 1;
}

.repo-meta {
    display: flex;
    gap: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    flex-wrap: wrap;
}

.repo-meta span {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

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

.project-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
}

.project-card h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.project-card p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.project-tech span {
    background: var(--light-bg);
    padding: 0.4rem 0.8rem;
    border-radius: 0.375rem;
    font-size: 0.85rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* ===================================
   Expertise Section
   =================================== */
.expertise {
    background: var(--white);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.expertise-category {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-sm);
}

.expertise-category h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.expertise-category h3 i {
    color: var(--secondary-color);
    font-size: 1.5rem;
}

.expertise-category ul {
    list-style: none;
}

.expertise-category li {
    padding: 0.75rem 0;
    border-bottom: 1px solid rgb(0, 0, 0, 0.05);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.expertise-category li:last-child {
    border-bottom: none;
}

.expertise-category li::before {
    content: '▹';
    color: var(--secondary-color);
    font-weight: 700;
    font-size: 1.2rem;
}

/* ===================================
   Certifications Section
   =================================== */
.certifications {
    background: var(--light-bg);
}

.education-section,
.certs-section {
    margin-bottom: 4rem;
}

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

.education-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition);
}

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

.edu-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--white);
}

.education-card h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.edu-school {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.edu-field {
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.edu-year {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.edu-recognition {
    color: var(--success);
    font-size: 0.9rem;
    font-weight: 600;
}

.certs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.cert-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.cert-card.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--success), var(--secondary-color));
}

.cert-card:hover {
    border-color: var(--secondary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.cert-badge {
    width: 70px;
    height: 70px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--secondary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: var(--white);
}

.cert-card h4 {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.cert-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.cert-org {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
}

.cert-expiry {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.cert-card.active .cert-expiry {
    color: var(--success);
    font-weight: 600;
}

.credly-link {
    text-align: center;
    margin-top: 2rem;
}

/* ===================================
   Contact Section
   =================================== */
.contact {
    background: var(--white);
}

.contact-content {
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.contact-card {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 0.75rem;
    text-align: center;
    transition: var(--transition);
}

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

.contact-card i {
    font-size: 2.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.contact-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.contact-card p {
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.text-muted {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.contact-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.contact-link-card {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    text-decoration: none;
    transition: var(--transition);
    border: 2px solid transparent;
}

.contact-link-card:hover {
    border-color: var(--secondary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.contact-link-card > i:first-child {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.contact-link-card.linkedin > i:first-child {
    color: #0077b5;
}

.contact-link-card.github > i:first-child {
    color: #333333;
}

.contact-link-card.credly > i:first-child {
    color: #ff6b00;
}

.contact-link-card div {
    flex-grow: 1;
}

.contact-link-card h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.contact-link-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.contact-link-card > i:last-child {
    color: var(--text-secondary);
    font-size: 1.25rem;
    opacity: 0.5;
    transition: var(--transition);
}

.contact-link-card:hover > i:last-child {
    opacity: 1;
    transform: translateX(5px);
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--dark-bg);
    color: var(--text-light);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
    align-items: center;
}

.footer-brand h3 {
    color: var(--white);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.footer-brand p {
    color: var(--text-light);
}

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

.footer-quote p {
    font-style: italic;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.footer-quote span {
    font-size: 0.9rem;
    color: var(--text-light);
}

.footer-social {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.footer-social a {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgb(255, 255, 255, 0.1);
    color: var(--white);
    font-size: 1.25rem;
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--secondary-color);
    transform: translateY(-5px);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgb(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* ===================================
   Back to Top Button
   =================================== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--secondary-color);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow-lg);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-color);
    transform: translateY(-5px);
}

/* ===================================
   Responsive Design
   =================================== */
@media (width <= 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        flex-direction: column;
        background: var(--dark-bg);
        width: 100%;
        padding: 2rem;
        gap: 1.5rem;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-lg);
    }

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

    .hero-stats {
        gap: 2rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    section {
        padding: 4rem 0;
    }

    .section-header {
        margin-bottom: 3rem;
    }
}

@media (width <= 480px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

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

    .github-repos {
        grid-template-columns: 1fr;
    }

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

/* ===================================
   Utility Classes
   =================================== */
.text-center {
    text-align: center;
}

.mb-1 { margin-bottom: 0.5rem; }

.mb-2 { margin-bottom: 1rem; }

.mb-3 { margin-bottom: 1.5rem; }

.mb-4 { margin-bottom: 2rem; }

.mt-1 { margin-top: 0.5rem; }

.mt-2 { margin-top: 1rem; }

.mt-3 { margin-top: 1.5rem; }

.mt-4 { margin-top: 2rem; }

.fade-in {
    animation: fade-in-up 0.8s ease;
}