/* Global Styles & Variables */
:root {
    /* Dark Mode (Primary) */
    --primary-accent: #6C63FF;
    --secondary-accent: #00C4B4;
    --background-dark: #1A1A2E;
    --text-light: #E0E0E0;
    --card-dark: #2C2C40;
    --border-color: #3A3A50;
    --heading-color: #E0E0E0;
    --link-color: var(--primary-accent);
    --button-bg-primary: var(--primary-accent);
    --button-text-primary: #FFFFFF;
    --button-bg-secondary: var(--secondary-accent);
    --button-text-secondary: #FFFFFF;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --code-bg: #222233; /* For code snippets if any */
    --timeline-line: #444466;
    --timeline-dot: var(--primary-accent);
}

/* Light Mode Variables */
.light-mode {
    --primary-accent: #6C63FF;
    --secondary-accent: #00C4B4;
    --background-dark: #F4F7FC; /* Light background */
    --text-light: #333333; /* Dark text */
    --card-dark: #FFFFFF; /* White cards */
    --border-color: #E0E0E0;
    --heading-color: #222222;
    --link-color: var(--primary-accent);
    --button-bg-primary: var(--primary-accent);
    --button-text-primary: #FFFFFF;
    --button-bg-secondary: var(--secondary-accent);
    --button-text-secondary: #FFFFFF;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --code-bg: #E8EBF2;
    --timeline-line: #CCCCCC;
    --timeline-dot: var(--primary-accent);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background-dark);
    color: var(--text-light);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    color: var(--heading-color);
    margin-bottom: 0.5em;
    font-weight: 600;
}

p {
    margin-bottom: 1em;
}

a {
    color: var(--link-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--secondary-accent);
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

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

.section-padding {
    padding: 80px 0;
}

.section-alt {
    background-color: var(--card-dark);
}

.section-title {
    font-size: 2.5em;
    margin-bottom: 40px;
    text-align: center;
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 0;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background-color: var(--primary-accent);
    border-radius: 2px;
}

/* Header & Navigation */
.header {
    background-color: var(--card-dark);
    padding: 15px 0;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px var(--shadow-color);
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.header.sticky {
    box-shadow: 0 4px 15px var(--shadow-color);
}

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

.logo {
    font-family: 'Poppins', sans-serif;
    font-size: 1.8em;
    font-weight: 700;
    color: var(--primary-accent);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-list {
    display: flex;
    gap: 25px;
}

.nav-link {
    color: var(--text-light);
    font-weight: 500;
    font-size: 1.05em;
    position: relative;
}

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

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

.social-icons a {
    color: var(--text-light);
    font-size: 1.3em;
    margin-left: 15px;
}

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

.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1100;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--text-light);
    margin: 5px 0;
    transition: all 0.3s ease;
}

.hamburger.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}
.hamburger.active span:nth-child(2) {
    opacity: 0;
}
.hamburger.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* Theme Switch */
.theme-switch-wrapper {
    display: flex;
    align-items: center;
    margin-left: 20px;
}

.theme-switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 20px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 2px;
    bottom: 2px;
    background-color: white;
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--primary-accent);
}

input:focus + .slider {
    box-shadow: 0 0 1px var(--primary-accent);
}

input:checked + .slider:before {
    transform: translateX(20px);
}

/* Rounded sliders */
.slider.round {
    border-radius: 20px;
}

.slider.round:before {
    border-radius: 50%;
}


/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 100px; /* Adjust for fixed header */
}

.hero-name {
    font-size: 4em;
    font-weight: 700;
    color: var(--primary-accent);
    margin-bottom: 10px;
    line-height: 1.2;
}

.hero-headline {
    font-size: 2.5em;
    font-weight: 600;
    color: var(--heading-color);
    margin-bottom: 20px;
    min-height: 1.5em; /* Ensure space for typing effect */
}

.hero-summary {
    font-size: 1.2em;
    max-width: 800px;
    margin: 0 auto 30px;
    color: var(--text-light);
}

.hero-social {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.btn {
    display: inline-block;
    padding: 12px 25px;
    border-radius: 5px;
    font-weight: 600;
    transition: all 0.3s ease;
    text-align: center;
}

.btn-primary {
    background-color: var(--button-bg-primary);
    color: var(--button-text-primary);
    border: 2px solid var(--button-bg-primary);
}

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

.btn-secondary {
    background-color: var(--button-bg-secondary);
    color: var(--button-text-secondary);
    border: 2px solid var(--button-bg-secondary);
}

.btn-secondary:hover {
    background-color: transparent;
    color: var(--secondary-accent);
}

.btn i {
    margin-right: 8px;
}

/* About Section */
.about-text {
    font-size: 1.1em;
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.skill-category {
    background-color: var(--card-dark);
    border-radius: 8px;
    padding: 25px;
    box-shadow: 0 4px 15px var(--shadow-color);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow-color);
}

.skill-category h4 {
    font-size: 1.5em;
    color: var(--primary-accent);
    margin-bottom: 20px;
    text-align: center;
}

.skill-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.skill-chip {
    background-color: var(--background-dark);
    color: var(--text-light);
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.9em;
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.skill-category:hover .skill-chip {
    background-color: var(--primary-accent);
    color: white;
}

/* Experience Section */
.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px 0;
}

.timeline::before {
    content: '';
    position: absolute;
    width: 4px;
    background-color: var(--timeline-line);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -2px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    background-color: inherit;
    width: 50%;
}

.timeline-item::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    right: -8px;
    background-color: var(--timeline-dot);
    border: 4px solid var(--card-dark);
    top: 15px;
    border-radius: 50%;
    z-index: 1;
}

.timeline-item.left {
    left: 0;
}

.timeline-item.right {
    left: 50%;
}

.timeline-item.right::after {
    left: -8px;
}

.timeline-item .timeline-content {
    padding: 20px 30px;
    background-color: var(--card-dark);
    position: relative;
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--shadow-color);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.timeline-item h4 {
    font-size: 1.3em;
    color: var(--primary-accent);
    margin-bottom: 5px;
}

.timeline-item .company {
    font-weight: 500;
    color: var(--text-light);
    margin-bottom: 5px;
}

.timeline-item .duration {
    font-size: 0.9em;
    color: var(--text-light);
    opacity: 0.8;
    margin-bottom: 15px;
    display: block;
}

.timeline-item ul {
    list-style: disc;
    margin-left: 20px;
    color: var(--text-light);
}

.timeline-item ul li {
    margin-bottom: 8px;
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.project-card {
    background-color: var(--card-dark);
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--shadow-color);
    border: 1px solid var(--border-color);
    padding: 30px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow-color);
}

.project-card h4 {
    font-size: 1.5em;
    color: var(--primary-accent);
    margin-bottom: 10px;
}

.project-card .project-type {
    font-size: 0.9em;
    color: var(--secondary-accent);
    margin-bottom: 10px;
    font-weight: 500;
}

.project-card .project-duration {
    font-size: 0.85em;
    color: var(--text-light);
    opacity: 0.7;
    margin-bottom: 15px;
}

.project-card .project-description {
    font-size: 1em;
    margin-bottom: 15px;
    flex-grow: 1;
}

.project-card .project-details-list {
    list-style: disc;
    margin-left: 20px;
    margin-bottom: 15px;
}
.project-card .project-details-list li {
    margin-bottom: 5px;
    font-size: 0.95em;
}

.project-card .project-technologies {
    margin-top: 15px;
    font-size: 0.9em;
    color: var(--text-light);
    opacity: 0.9;
    font-weight: 500;
}

.project-card .project-technologies strong {
    color: var(--secondary-accent);
}

/* Education Section */
.education-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.education-card {
    background-color: var(--card-dark);
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--shadow-color);
    border: 1px solid var(--border-color);
    padding: 25px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.education-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow-color);
}

.education-card h4 {
    font-size: 1.4em;
    color: var(--primary-accent);
    margin-bottom: 5px;
}

.education-card .institution {
    font-weight: 500;
    color: var(--text-light);
    margin-bottom: 5px;
}

.education-card .duration,
.education-card .grade {
    font-size: 0.9em;
    color: var(--text-light);
    opacity: 0.8;
    margin-bottom: 5px;
}

/* Achievements Section */
.achievements-list {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.achievements-list li {
    background-color: var(--card-dark);
    padding: 20px 25px;
    border-radius: 8px;
    box-shadow: 0 4px 10px var(--shadow-color);
    border: 1px solid var(--border-color);
    font-size: 1.1em;
    display: flex;
    align-items: flex-start;
    gap: 15px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.achievements-list li:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 15px var(--shadow-color);
}

.achievements-list li i {
    color: var(--secondary-accent);
    font-size: 1.4em;
    margin-top: 3px;
    flex-shrink: 0;
}

/* Contact Section */
.contact-info {
    text-align: center;
    margin-bottom: 40px;
}

.contact-info p {
    font-size: 1.2em;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.contact-info p i {
    color: var(--primary-accent);
    font-size: 1.5em;
}

.contact-info p a {
    color: var(--text-light);
    text-decoration: underline;
}

.contact-info p a:hover {
    color: var(--primary-accent);
}

.social-links-bottom {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 30px;
}

.social-links-bottom a {
    color: var(--text-light);
    transition: color 0.3s ease;
}

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

/* Footer */
.footer {
    background-color: var(--card-dark);
    padding: 30px 0;
    text-align: center;
    font-size: 0.9em;
    color: var(--text-light);
    border-top: 1px solid var(--border-color);
}

.footer-icon {
    color: #e74c3c; /* Red heart */
    margin: 0 5px;
}

/* Scroll Reveal Animations */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    will-change: opacity, transform;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 992px) {
    .header-content {
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }
    .nav-menu {
        width: 100%;
        order: 3; /* Move below logo on wrap */
        justify-content: center;
        margin-top: 15px;
    }
    .nav-list {
        gap: 15px;
    }
    .hero-name {
        font-size: 3.5em;
    }
    .hero-headline {
        font-size: 2em;
    }
    .timeline::before {
        left: 18px;
    }
    .timeline-item {
        width: 100%;
        padding-left: 50px;
        padding-right: 15px;
    }
    .timeline-item.right {
        left: 0%;
    }
    .timeline-item::after {
        left: 10px;
    }
    .timeline-item.right::after {
        left: 10px;
    }
    .timeline-item .timeline-content {
        padding: 20px;
    }
}

@media (max-width: 768px) {
    .header-content {
        justify-content: space-between;
        flex-wrap: nowrap;
    }
    .nav-menu {
        display: none; /* Hide by default on mobile */
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--card-dark);
        box-shadow: 0 8px 15px var(--shadow-color);
        padding: 20px 0;
        text-align: center;
        gap: 15px;
    }
    .nav-menu.active {
        display: flex;
    }
    .nav-list {
        flex-direction: column;
        gap: 15px;
    }
    .nav-link {
        font-size: 1.1em;
        padding: 10px 0;
        display: block;
    }
    .social-icons {
        margin-top: 20px;
        display: flex;
        justify-content: center;
    }
    .social-icons a {
        margin: 0 10px;
    }
    .theme-switch-wrapper {
        margin-left: auto;
        margin-right: 15px; /* Space from hamburger */
    }
    .hamburger {
        display: block;
    }

    .hero-name {
        font-size: 3em;
    }
    .hero-headline {
        font-size: 1.5em;
    }
    .hero-summary {
        font-size: 1em;
    }
    .btn {
        padding: 10px 20px;
        font-size: 0.9em;
    }
    .section-title {
        font-size: 2em;
    }
    .skills-grid, .projects-grid, .education-grid {
        grid-template-columns: 1fr;
    }
    .skill-category, .project-card, .education-card {
        padding: 20px;
    }
    .skill-category h4, .project-card h4, .education-card h4 {
        font-size: 1.3em;
    }
    .achievements-list li {
        font-size: 1em;
        padding: 15px;
    }
    .contact-info p {
        font-size: 1em;
        flex-direction: column;
        gap: 5px;
    }
    .contact-info p i {
        margin-bottom: 5px;
    }
}

@media (max-width: 480px) {
    .hero-name {
        font-size: 2.5em;
    }
    .hero-headline {
        font-size: 1.2em;
    }
    .hero-social {
        flex-direction: column;
        gap: 15px;
    }
    .btn {
        width: 80%;
        margin: 0 auto;
    }
    .section-padding {
        padding: 60px 0;
    }
    .section-title {
        font-size: 1.8em;
    }
    .achievements-list li {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
    .achievements-list li i {
        margin-top: 0;
    }
}