:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --bg-light: #ffffff;
    --bg-alt-light: #f8fafc;
    --text-light: #1e293b;
    --text-muted-light: #64748b;
    --bg-dark: #0f172a;
    --bg-alt-dark: #1e293b;
    --text-dark: #f8fafc;
    --text-muted-dark: #94a3b8;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    transition: var(--transition);
}

.light-theme {
    background-color: var(--bg-light);
    color: var(--text-light);
}

.dark-theme {
    background-color: var(--bg-dark);
    color: var(--text-dark);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    height: 70px;
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

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

.logo span {
    font-family: 'Fira Code', monospace;
    opacity: 0.7;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: inherit;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

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

.theme-toggle, .hamburger {
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
}

.theme-toggle:hover {
    color: var(--primary-color);
    transform: rotate(15deg);
}

.hamburger {
    display: none;
}

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 70px;
}

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

.hero h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

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

.subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    font-family: 'Fira Code', monospace;
    opacity: 0.8;
}

.hero-tags {
    display: flex;
    gap: 1rem;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
}

.hero-tags span {
    padding: 0.5rem 1rem;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-color);
}

.hero-btns {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.btn {
    padding: 0.8rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-secondary:hover {
    background: rgba(99, 102, 241, 0.05);
    transform: translateY(-2px);
}

.social-links {
    display: flex;
    gap: 1.5rem;
    font-size: 1.5rem;
}

.social-links a {
    color: inherit;
    opacity: 0.7;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--primary-color);
    opacity: 1;
    transform: translateY(-2px);
}

/* Sections */
.section {
    padding: 8rem 0;
}

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

.light-theme .bg-alt {
    background-color: var(--bg-alt-light);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 4rem;
    position: relative;
}

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

/* About */
.about-grid {
    display: grid;
    gap: 3rem;
    max-width: 800px;
    margin: 0 auto;
}

.about-text p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    opacity: 0.9;
}

.achievements {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.achievement-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(99, 102, 241, 0.05);
    border-radius: 8px;
}

.achievement-item i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
}

.skill-card {
    padding: 2rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

.light-theme .skill-card {
    background: white;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.skill-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.skill-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.skill-icon img {
    width: 48px;
    height: 48px;
    object-fit: contain;
    display: block;
}

.skill-card h3 {
    margin-bottom: 1rem;
}

.skill-bar {
    height: 8px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 4px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: var(--primary-color);
    border-radius: 4px;
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    border-radius: 12px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
    position: relative;
    padding: 2rem;
}

.light-theme .project-card {
    background: white;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2);
    border-color: var(--primary-color);
}

.project-category {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--primary-color);
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
    display: block;
}

.project-card h3 {
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.project-card p {
    font-size: 0.95rem;
    opacity: 0.8;
    margin-bottom: 1.5rem;
}

.project-links {
    display: flex;
    gap: 1.5rem;
}

.project-links a {
    text-decoration: none;
    color: inherit;
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

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

.view-more {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom: 1px solid transparent;
}

.view-more:hover {
    border-color: var(--primary-color);
}

/* Contact */
.contact-box {
    max-width: 600px;
    margin: 0 auto;
}

.contact-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 3rem;
    flex-wrap: wrap;
}

.contact-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

.contact-item i {
    font-size: 2rem;
    color: var(--primary-color);
}

.contact-item:hover {
    transform: translateY(-5px);
    color: var(--primary-color);
}

/* Footer */
footer {
    padding: 4rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
}

footer p {
    font-size: 0.9rem;
    opacity: 0.7;
}

footer i {
    color: #ef4444;
    margin: 0 0.2rem;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s ease forwards;
}

.fade-in:nth-child(2) { animation-delay: 0.2s; }
.fade-in:nth-child(3) { animation-delay: 0.4s; }
.fade-in:nth-child(4) { animation-delay: 0.6s; }
.fade-in:nth-child(5) { animation-delay: 0.8s; }

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

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.8rem; }
    .nav-links { display: none; }
    .hamburger { display: block; }
}

/* Project Sub-pages */
.project-hero {
    padding: 10rem 0 5rem;
    background: linear-gradient(to bottom, rgba(99, 102, 241, 0.05), transparent);
}

.back-link {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    transition: var(--transition);
}

.back-link:hover {
    transform: translateX(-5px);
}

.project-hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.project-meta {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
    flex-wrap: wrap;
    opacity: 0.8;
}

.project-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
}

.project-details {
    padding: 4rem 0;
    max-width: 800px;
}

.project-section {
    margin-bottom: 4rem;
}

.project-section h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.project-section p {
    font-size: 1.1rem;
    line-height: 1.8;
    opacity: 0.9;
}

.project-section ul {
    list-style: none;
}

.project-section ul li {
    margin-bottom: 1rem;
    position: relative;
    padding-left: 1.5rem;
    font-size: 1.05rem;
}

.project-section ul li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.tech-tags {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
}

.tech-tags span {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    padding: 0.4rem 1rem;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.9rem;
}

.btn-group {
    display: flex;
    gap: 1rem;
}

/* Experience styles */
.experience-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.experience-item h3 {
    margin-bottom: 0.25rem;
}

.experience-item .muted {
    color: var(--text-muted-dark);
    margin-bottom: 0.8rem;
}

.experience-item ul {
    margin-left: 1rem;
}

@media (min-width: 900px) {
    .experience-list {
        grid-template-columns: 1fr 1fr;
    }
}