/* Global Styles & Variables */
:root {
    /* Color Palette */
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --accent-color: #2563eb;
    --accent-hover: #1d4ed8;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* Typography */
    --font-main: 'Inter', sans-serif;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
}

[data-theme="dark"] {
    --bg-color: #111827;
    --card-bg: #1f2937;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --border-color: #374151;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
}

[data-theme="dark"] .bg-light {
    background-color: #1f2937;
}

[data-theme="dark"] .navbar {
    background-color: rgba(17, 24, 39, 0.9);
}

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

html {
    scroll-behavior: smooth;
}

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

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

ul {
    list-style: none;
}

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

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

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

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.bg-light {
    background-color: #ffffff;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 0.375rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
}

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

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 1rem 0;
}

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

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

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

.nav-links a {
    font-weight: 500;
    color: var(--text-secondary);
}

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

#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.25rem;
    color: var(--text-primary);
    padding: 0.25rem;
    border-radius: 50%;
    transition: background-color var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

#theme-toggle:hover {
    background-color: var(--border-color);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 80px; /* Navbar height + spacing */
    padding-bottom: var(--spacing-lg);
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    width: 100%;
}

.hero-text {
    flex: 1;
    text-align: left;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.02em;
}

.hero h2 {
    font-size: 2rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 0 var(--spacing-lg) 0;
}

.hero-image {
    flex: 0 0 350px;
    position: relative;
}

.hero-image img {
    width: 100%;
    border-radius: 2rem;
    box-shadow: var(--shadow-xl);
    border: 4px solid var(--card-bg);
}

/* About Section */
.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* Skills Section */
.skills-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    max-width: 800px;
    margin: 0 auto;
}

.skill-card {
    background-color: var(--bg-color);
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-weight: 500;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.skill-card:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: translateY(-2px);
}

@media (max-width: 900px) {
    .hero-content {
        flex-direction: column-reverse;
        text-align: center;
        gap: var(--spacing-md);
    }

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

    .hero p {
        margin: 0 auto var(--spacing-lg);
    }

    .hero-image {
        flex: 0 0 250px;
        width: 250px;
    }
    
    .hero h1 {
        font-size: 3rem;
    }
}


.skill-card:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
    transform: translateY(-2px);
}

/* Timeline (Experience & Education) */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline-item {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-medium);
}

.timeline-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-color);
}

.timeline-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.timeline-content .company {
    display: block;
    font-weight: 500;
    color: var(--accent-color);
    margin-bottom: 0.25rem;
}

.timeline-content .date {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.timeline-content p {
    color: var(--text-secondary);
}

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

.project-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    overflow: hidden; /* Ensure image doesn't overflow rounded corners */
    transition: all var(--transition-medium);
    display: flex;
    flex-direction: column;
}

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

.project-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    border-bottom: 1px solid var(--border-color);
}

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

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-info {
    padding: var(--spacing-md);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-info h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

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

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

.project-tags span {
    font-size: 0.875rem;
    background-color: var(--bg-color);
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
    color: var(--text-secondary);
}

/* Testimonials Section */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    max-width: 900px;
    margin: 0 auto;
}

.testimonial-card {
    background-color: var(--bg-color);
    padding: var(--spacing-md);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.testimonial-card p {
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.testimonial-card h4 {
    font-size: 1rem;
    font-weight: 600;
}

/* Contact Section */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background-color: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color var(--transition-fast);
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Footer */
.footer {
    background-color: var(--card-bg);
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--border-color);
    margin-top: var(--spacing-xl);
}

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

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

.social-links a {
    color: var(--text-secondary);
}

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

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

.fade-in-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

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

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero h2 {
        font-size: 1.5rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .nav-links {
        display: none; /* Mobile menu implementation would go here */
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
}