:root {
    /* Light Mode Colors */
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #0f172a;
    --color-text-secondary: #475569;
    --color-accent: #0ea5e9;
    --color-accent-dark: #0284c7;
    --color-border: #e2e8f0;
    --color-shadow: rgba(0, 0, 0, 0.1);
    
    /* Typography */
    --font-display: 'Crimson Pro', serif;
    --font-body: 'DM Sans', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

[data-theme="dark"] {
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-accent: #38bdf8;
    --color-accent-dark: #0ea5e9;
    --color-border: #334155;
    --color-shadow: rgba(0, 0, 0, 0.4);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
}

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

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

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

ul {
    list-style: none;
}

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

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 2rem;
    right: 2rem;
    z-index: 1000;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.25rem;
    color: var(--color-text);
    transition: all var(--transition-base);
    box-shadow: 0 4px 6px var(--color-shadow);
}

.theme-toggle:hover {
    background: var(--color-accent);
    color: white;
    transform: rotate(20deg) scale(1.1);
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    z-index: 999;
    transition: all var(--transition-base);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

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

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

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-fast);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: var(--spacing-xl) var(--spacing-md);
    overflow: hidden;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.hero-content {
    max-width: 700px;
}

.hero-greeting {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
}

.hero-name {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.hero-tagline {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* Floating Shapes */
.hero-decoration {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
    pointer-events: none;
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: var(--color-accent);
    top: 10%;
    right: -100px;
    animation-delay: 0s;
}

.shape-2 {
    width: 300px;
    height: 300px;
    background: var(--color-accent-dark);
    bottom: 20%;
    left: -50px;
    animation-delay: 5s;
}

.shape-3 {
    width: 200px;
    height: 200px;
    background: var(--color-accent);
    top: 50%;
    left: 50%;
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    33% {
        transform: translate(30px, -30px) rotate(120deg);
    }
    66% {
        transform: translate(-20px, 20px) rotate(240deg);
    }
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 60px;
    background: var(--color-border);
    overflow: hidden;
}

.scroll-line {
    width: 100%;
    height: 30px;
    background: var(--color-accent);
    animation: scroll 2s infinite;
}

@keyframes scroll {
    0% {
        transform: translateY(-100%);
    }
    100% {
        transform: translateY(200%);
    }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-weight: 600;
    border-radius: 8px;
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--color-accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px var(--color-shadow);
}

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

.btn-secondary:hover {
    background: var(--color-accent);
    color: white;
    transform: translateY(-2px);
}

/* Section Styles */
section {
    padding: var(--spacing-xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-label {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

/* About Section */
.about {
    background: var(--color-surface);
}

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

.about-intro {
    font-size: 1.25rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.about-text p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

.about-motto {
    font-family: var(--font-display);
    font-size: 1.125rem;
    padding: var(--spacing-md);
    border-left: 3px solid var(--color-accent);
    background: var(--color-bg);
    margin: var(--spacing-md) 0;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.stat {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: 12px;
    transition: transform var(--transition-base);
}

.stat:hover {
    transform: translateY(-5px);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* Skills */
.skills-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

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

.skill-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--color-bg);
    border-radius: 12px;
    transition: all var(--transition-base);
}

.skill-item:hover {
    background: var(--color-accent);
    color: white;
    transform: translateY(-5px);
}

.skill-item i {
    font-size: 2.5rem;
}

.skill-item span {
    font-size: 0.875rem;
    font-weight: 500;
    text-align: center;
}

/* Portfolio Section */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background: var(--color-surface);
    border-radius: 16px;
    overflow: hidden;
    transition: transform var(--transition-base);
    box-shadow: 0 4px 6px var(--color-shadow);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px var(--color-shadow);
}

.project-image {
    position: relative;
    overflow: hidden;
    height: 250px;
}

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

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

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-link {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all var(--transition-fast);
}

.project-link:hover {
    background: white;
    color: var(--color-accent);
    transform: scale(1.2);
}

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

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

.project-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag {
    display: inline-block;
    padding: 0.375rem 0.75rem;
    background: var(--color-bg);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-accent);
}

/* Experience Section */
.experience {
    background: var(--color-surface);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    padding-left: 80px;
    margin-bottom: var(--spacing-lg);
}

.timeline-dot {
    position: absolute;
    left: 20px;
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 4px solid var(--color-surface);
    box-shadow: 0 0 0 4px var(--color-border);
}

.timeline-content {
    background: var(--color-bg);
    padding: var(--spacing-md);
    border-radius: 12px;
    transition: transform var(--transition-base);
}

.timeline-item:hover .timeline-content {
    transform: translateX(10px);
}

.timeline-date {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.timeline-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.timeline-company {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.timeline-description {
    list-style: disc;
    padding-left: var(--spacing-md);
}

.timeline-description li {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.contact-intro {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-secondary);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: start;
}

.contact-item i {
    font-size: 1.5rem;
    color: var(--color-accent);
    margin-top: 0.25rem;
}

.contact-item h4 {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.contact-item a {
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.contact-item a:hover {
    color: var(--color-accent);
}

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

.social-links a {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    transition: all var(--transition-base);
}

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

/* Contact Form */
.contact-form {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: 16px;
    box-shadow: 0 4px 6px var(--color-shadow);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.875rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text);
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-accent);
}

.form-group textarea {
    resize: vertical;
}

/* Footer */
.footer {
    background: var(--color-surface);
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.footer p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

/* Animations */
.fade-in {
    animation: fadeIn 1s ease-out;
}

.fade-in-delay-1 {
    animation: fadeIn 1s ease-out 0.2s backwards;
}

.fade-in-delay-2 {
    animation: fadeIn 1s ease-out 0.4s backwards;
}

.fade-in-delay-3 {
    animation: fadeIn 1s ease-out 0.6s backwards;
}

.fade-in-delay-4 {
    animation: fadeIn 1s ease-out 0.8s backwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 968px) {
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--color-surface);
        width: 100%;
        text-align: center;
        transition: left var(--transition-base);
        box-shadow: 0 10px 27px var(--color-shadow);
        padding: var(--spacing-md) 0;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero {
        padding-top: 100px;
    }
    
    .theme-toggle {
        top: 1rem;
        right: 5rem;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    }
    
    .timeline::before {
        left: 15px;
    }
    
    .timeline-item {
        padding-left: 50px;
    }
    
    .timeline-dot {
        left: 5px;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-md: 1.5rem;
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        text-align: center;
    }
}