/* ===================================
   CSS Variables & Reset
   =================================== */

:root {
    /* Color Palette */
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --accent-color: #28a745;
    --bg-color: #f8f9fa;
    --text-color: #212529;
    --white: #ffffff;
    --dark-bg: #0d1117;
    --card-bg: #ffffff;
    --shadow: rgba(0, 0, 0, 0.1);
    --shadow-hover: rgba(0, 0, 0, 0.15);

    /* Typography */
    --font-primary: 'Poppins', sans-serif;
    --font-secondary: 'Inter', sans-serif;
    --font-size-base: 16px;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;

    /* Transitions */
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

section {
    padding: var(--spacing-xl) 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===================================
   Typography Classes
   =================================== */

.section-title {
    font-family: var(--font-primary);
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--accent-color);
    margin: var(--spacing-sm) auto 0;
    border-radius: 2px;
}

.section-description {
    text-align: center;
    color: var(--secondary-color);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ===================================
   Navigation Bar
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--white);
    box-shadow: 0 2px 10px var(--shadow);
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: 0 4px 20px var(--shadow-hover);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo a {
    font-family: var(--font-primary);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
}

.accent-dot {
    color: var(--accent-color);
    font-size: 2rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-link {
    font-family: var(--font-primary);
    font-weight: 500;
    color: var(--text-color);
    position: relative;
    padding: 0.5rem 0;
}

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

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

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

.nav-link.resume-btn {
    background: var(--accent-color);
    color: var(--white);
    padding: 0.5rem 1.25rem;
    border-radius: 5px;
    transition: var(--transition);
}

.nav-link.resume-btn:hover {
    background: #218838;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
}

.nav-link.resume-btn::after {
    display: none;
}

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

.hamburger .bar {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    border-radius: 3px;
    transition: var(--transition);
}

/* ===================================
   Home / Hero Section
   =================================== */

.home-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 100px;
    background: linear-gradient(135deg, var(--bg-color) 0%, #e3f2fd 100%);
}

.home-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.home-text {
    animation: fadeInLeft 0.8s ease;
}

.home-title {
    font-family: var(--font-primary);
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

.highlight {
    color: var(--primary-color);
}

.home-subtitle {
    font-family: var(--font-primary);
    font-size: 1.75rem;
    color: var(--accent-color);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

.home-description {
    font-size: 1.125rem;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.home-buttons {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: 5px;
    font-family: var(--font-primary);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: #218838;
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(40, 167, 69, 0.4);
}

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

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 123, 255, 0.4);
}

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

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

.home-social {
    display: flex;
    gap: var(--spacing-sm);
}

.home-social a {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--white);
    border-radius: 50%;
    font-size: 1.5rem;
    color: var(--primary-color);
    box-shadow: 0 4px 10px var(--shadow);
    transition: var(--transition);
}

.home-social a:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px var(--shadow-hover);
    color: var(--accent-color);
}

.home-image {
    animation: fadeInRight 0.8s ease;
}

.image-wrapper {
    position: relative;
    width: 100%;
    max-width: 450px;
    margin: 0 auto;
}

.image-wrapper img {
    width: 100%;
    border-radius: 20px;
    box-shadow: 0 10px 40px var(--shadow-hover);
    border: 5px solid var(--white);
}

/* ===================================
   About Section
   =================================== */

.about-section {
    background: var(--white);
}

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

.about-text {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
    text-align: justify;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.highlight-item {
    background: var(--bg-color);
    padding: var(--spacing-md);
    border-radius: 10px;
    text-align: center;
    transition: var(--transition);
    border: 2px solid transparent;
}

.highlight-item:hover {
    border-color: var(--accent-color);
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow);
}

.highlight-item i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.highlight-item h3 {
    font-family: var(--font-primary);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-color);
}

.highlight-item p {
    color: var(--secondary-color);
    font-size: 0.95rem;
}

.mt-small {
    margin-top: var(--spacing-sm);
}

/* ===================================
   Skills Section
   =================================== */

.skills-section {
    background: var(--bg-color);
}

.skills-category {
    margin-bottom: var(--spacing-xl);
}

.skills-category:last-child {
    margin-bottom: 0;
}

.skills-subtitle {
    font-family: var(--font-primary);
    font-size: 1.75rem;
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
    max-width: 1000px;
    margin: 0 auto;
}

.skill-card {
    background: var(--white);
    padding: var(--spacing-md);
    border-radius: 10px;
    text-align: center;
    transition: var(--transition);
    box-shadow: 0 4px 10px var(--shadow);
    border: 2px solid transparent;
}

.skill-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px var(--shadow-hover);
    border-color: var(--accent-color);
}

.skill-card img {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-sm);
    transition: var(--transition);
}

.skill-card:hover img {
    transform: scale(1.1);
}

.skill-card p {
    font-family: var(--font-primary);
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.95rem;
}

.invert-icon {
    filter: invert(1);
}

/* ===================================
   Projects Section
   =================================== */

.projects-section {
    background: var(--white);
}

.projects-grid {
    display: grid;
    gap: var(--spacing-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.project-card {
    background: var(--card-bg);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px var(--shadow);
    transition: var(--transition);
    border: 2px solid transparent;
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px var(--shadow-hover);
    border-color: var(--accent-color);
}

.project-image {
    position: relative;
    overflow: hidden;
    height: 300px;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.project-card:hover .project-image img {
    transform: scale(1.1);
}

.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: var(--spacing-sm);
}

.project-link {
    padding: 0.75rem 1.5rem;
    background: var(--white);
    color: var(--primary-color);
    border-radius: 5px;
    font-family: var(--font-primary);
    font-weight: 600;
    transition: var(--transition);
}

.project-link:hover {
    background: var(--accent-color);
    color: var(--white);
    transform: scale(1.05);
}

.project-content {
    padding: var(--spacing-md);
}

.project-title {
    font-family: var(--font-primary);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
}

.project-description {
    color: var(--secondary-color);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--spacing-md);
}

.tech-badge {
    background: var(--accent-color);
    color: var(--white);
    padding: 0.4rem 0.9rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    font-family: var(--font-primary);
    transition: var(--transition);
}

.tech-badge:hover {
    background: var(--primary-color);
    transform: scale(1.05);
}

.project-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

/* ===================================
   GitHub Stats Section
   =================================== */

.github-stats-section {
    background: var(--dark-bg);
    color: var(--white);
}

.github-stats-section .section-title {
    color: var(--white);
}

.github-stats-section .section-description {
    color: #8b949e;
}

.github-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.github-stat-card {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    transition: var(--transition);
}

.github-stat-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.08);
}

.github-stat-card img {
    width: 100%;
    border-radius: 8px;
}

.github-stat-card.full-width {
    grid-column: 1 / -1;
}

.github-calendar-wrapper {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-md);
    border-radius: 10px;
    margin-top: var(--spacing-md);
}

.calendar-title {
    font-family: var(--font-primary);
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--white);
}

.calendar {
    max-width: 100%;
    overflow-x: auto;
}

/* ===================================
   Contact Section
   =================================== */

.contact-section {
    background: var(--white);
}

.contact-content {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

.contact-info {
    display: grid;
    gap: var(--spacing-md);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-color);
    border-radius: 10px;
    transition: var(--transition);
    border: 2px solid transparent;
}

.contact-item:hover {
    border-color: var(--accent-color);
    transform: translateX(10px);
    box-shadow: 0 5px 15px var(--shadow);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.contact-details h3 {
    font-family: var(--font-primary);
    font-size: 1.125rem;
    margin-bottom: 0.25rem;
    color: var(--text-color);
}

.contact-details a {
    color: var(--accent-color);
    font-weight: 600;
}

.contact-details a:hover {
    text-decoration: underline;
}

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

.contact-social {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--bg-color);
    border-radius: 10px;
}

.contact-social h3 {
    font-family: var(--font-primary);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-family: var(--font-primary);
    font-weight: 600;
    color: var(--white);
    transition: var(--transition);
}

.social-link.linkedin {
    background: #0077b5;
}

.social-link.github {
    background: #333;
}

.social-link.leetcode {
    background: #ffa116;
}

.social-link:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow-hover);
}

/* ===================================
   Footer
   =================================== */

.footer {
    background: var(--dark-bg);
    color: var(--white);
    padding: var(--spacing-lg) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3,
.footer-section h4 {
    font-family: var(--font-primary);
    margin-bottom: var(--spacing-sm);
    color: var(--accent-color);
}

.footer-logo {
    font-size: 1.75rem;
    font-weight: 700;
}

.footer-description {
    color: #8b949e;
    line-height: 1.6;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-links a {
    color: #8b949e;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--accent-color);
    padding-left: 5px;
}

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--white);
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-md);
    text-align: center;
    color: #8b949e;
}

.footer-bottom p {
    margin: 0.5rem 0;
}

.footer-bottom .fa-heart {
    color: #e74c3c;
    animation: heartbeat 1.5s infinite;
}

/* ===================================
   Animations
   =================================== */

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes heartbeat {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
}

/* ===================================
   Responsive Design
   =================================== */

/* Tablet (768px - 1023px) */
@media screen and (max-width: 1023px) {
    .section-title {
        font-size: 2rem;
    }

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

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

    .home-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .home-image {
        order: -1;
    }

    .image-wrapper {
        max-width: 350px;
    }

    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
        gap: var(--spacing-sm);
    }

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

/* Mobile (Below 768px) */
@media screen and (max-width: 767px) {
    :root {
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;
    }

    section {
        padding: var(--spacing-lg) 0;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    /* Navigation Mobile */
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--white);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: var(--spacing-md) 0;
        gap: 0;
    }

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

    .nav-item {
        margin: var(--spacing-sm) 0;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

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

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    /* Home Section Mobile */
    .home-section {
        padding-top: 80px;
        min-height: auto;
    }

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

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

    .home-description {
        font-size: 1rem;
    }

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

    .btn {
        width: 100%;
        justify-content: center;
    }

    .image-wrapper {
        max-width: 280px;
    }

    /* Section Titles */
    .section-title {
        font-size: 1.75rem;
    }

    .section-description {
        font-size: 1rem;
    }

    /* About Section Mobile */
    .about-highlights {
        grid-template-columns: 1fr;
    }

    .about-text {
        font-size: 1rem;
        text-align: left;
    }

    /* Skills Section Mobile */
    .skills-subtitle {
        font-size: 1.5rem;
    }

    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
        gap: var(--spacing-sm);
    }

    .skill-card {
        padding: var(--spacing-sm);
    }

    .skill-card img {
        width: 50px;
        height: 50px;
    }

    .skill-card p {
        font-size: 0.85rem;
    }

    /* Projects Mobile */
    .project-image {
        height: 200px;
    }

    .project-title {
        font-size: 1.25rem;
    }

    .project-description {
        font-size: 0.9rem;
    }

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

    .tech-badge {
        font-size: 0.75rem;
        padding: 0.3rem 0.7rem;
    }

    /* GitHub Stats Mobile */
    .github-stats-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    /* Contact Section Mobile */
    .contact-item {
        flex-direction: column;
        text-align: center;
    }

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

    .social-link {
        width: 100%;
        justify-content: center;
    }

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

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

    .footer-links {
        align-items: center;
    }
}

/* Small Mobile (Below 480px) */
@media screen and (max-width: 480px) {
    .home-title {
        font-size: 1.75rem;
    }

    .home-social a {
        width: 45px;
        height: 45px;
        font-size: 1.25rem;
    }

    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
    }

    .project-links {
        flex-direction: column;
        width: 100%;
    }

    .project-link {
        width: 100%;
        text-align: center;
    }
}