/* Modern CSS Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-bg: #ffffff;
    --secondary-bg: #f8fafc;
    --accent-bg: #0f172a;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --border-color: #e2e8f0;
    --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);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;
    --max-width: 1200px;
    --section-padding: 5rem 1.5rem;
    --border-radius: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--primary-bg);
    line-height: 1.7;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    padding: 1rem 0;
    transition: var(--transition);
}

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

.logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

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

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

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: var(--transition);
}

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

/* Dark Mode Toggle */
.dark-mode-toggle {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    font-size: 1rem;
}

.dark-mode-toggle:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* Enhanced Dark Mode Variables */
[data-theme="dark"] {
    --primary-bg: #0f172a;
    --secondary-bg: #1e293b;
    --accent-bg: #ffffff;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --border-color: #334155;
    --accent-color: #60a5fa;
    --accent-hover: #3b82f6;
}

/* Dark Mode Navigation Fixes */
[data-theme="dark"] nav {
    background: rgba(15, 23, 42, 0.95);
    border-bottom-color: var(--border-color);
}

[data-theme="dark"] .logo {
    color: var(--text-primary);
}

[data-theme="dark"] .nav-links a {
    color: var(--text-secondary);
}

[data-theme="dark"] .nav-links a:hover {
    color: var(--accent-color);
}

[data-theme="dark"] .dark-mode-toggle {
    border-color: var(--border-color);
    color: var(--text-secondary);
}

[data-theme="dark"] .dark-mode-toggle:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* Dark Mode Profile Image Fix */
[data-theme="dark"] .profile-img::before {
    opacity: 0.3;
    background: linear-gradient(45deg, var(--accent-color), #8b5cf6, var(--accent-color));
}

/* Dark Mode Hero Section */
[data-theme="dark"] .hero {
    background: linear-gradient(135deg, var(--secondary-bg) 0%, var(--primary-bg) 100%);
}

[data-theme="dark"] .hero-content h1 {
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Dark Mode Button Styles */
[data-theme="dark"] .btn-secondary {
    color: var(--text-primary);
    border-color: var(--border-color);
}

[data-theme="dark"] .btn-secondary:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* Dark Mode Resume PDF Icon */
[data-theme="dark"] .resume-thumbnail i {
    color: #f472b6;
}

/* Dark Mode Footer */
[data-theme="dark"] footer {
    background: var(--primary-bg);
    border-top: 1px solid var(--border-color);
}

[data-theme="dark"] footer p {
    color: var(--text-secondary);
}

/* Enhanced Navigation Scroll Effect for Dark Mode */
[data-theme="dark"] nav.scrolled {
    background: rgba(15, 23, 42, 0.98);
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.3);
}

/* Hero Section */
.hero {
    padding: 8rem 1.5rem 6rem;
    background: linear-gradient(135deg, var(--secondary-bg) 0%, var(--primary-bg) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content h1 {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--accent-color);
    font-weight: 600;
    margin-bottom: 1.5rem;
    letter-spacing: 0.5px;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    max-width: 500px;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
    border: 2px solid transparent;
}

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

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

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

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

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
}

.profile-img {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background-image: url('../images/deeprofile.jpeg');
    background-size: cover;
    background-position: center;
    box-shadow: var(--shadow-xl);
    position: relative;
    overflow: hidden;
}

.profile-img::before {
    content: '';
    position: absolute;
    inset: -4px;
    background: linear-gradient(45deg, var(--accent-color), #8b5cf6, var(--accent-color));
    border-radius: 50%;
    z-index: -1;
    opacity: 0.7;
}

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

.section-container {
    max-width: var(--max-width);
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Projects Section */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.project-card {
    background: var(--primary-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-color), #8b5cf6);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.project-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.project-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Publications Section */
.publications {
    background: var(--secondary-bg);
}

.publication-item {
    background: var(--primary-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.publication-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.publication-item a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

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

/* Software Section */
.software-showcase {
    display: flex;
    align-items: center;
    gap: 3rem;
    background: var(--primary-bg);
    border-radius: var(--border-radius);
    padding: 3rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.software-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.software-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.software-links a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

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

.software-image {
    flex-shrink: 0;
}

.software-image img {
    width: 150px;
    height: auto;
    border-radius: var(--border-radius);
}

/* Modern Skills Section */
.skills {
    background: var(--secondary-bg);
}

.skills-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.skill-category {
    background: var(--primary-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.skill-category::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-color), #8b5cf6, #ec4899);
    transform: scaleX(0);
    transition: var(--transition);
}

.skill-category:hover::before {
    transform: scaleX(1);
}

.skill-category:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.category-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.category-icon {
    font-size: 1.25rem;
    color: var(--accent-color);
}

.skills-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.skill-tag {
    background: var(--secondary-bg);
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.skill-tag::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: var(--transition);
}

.skill-tag:hover::before {
    left: 100%;
}

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

/* Contact Section */
.contact-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-icons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 2rem;
}

.contact-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--secondary-bg);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1.5rem;
    transition: var(--transition);
    border: 2px solid var(--border-color);
}

.contact-icon:hover {
    background: var(--accent-color);
    color: white;
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* Footer */
footer {
    background: var(--accent-bg);
    color: white;
    text-align: center;
    padding: 2rem 1.5rem;
    margin-top: 4rem;
}

footer p {
    color: var(--text-muted);
}

/* Resume Section Styles */
.resume-showcase {
    display: flex;
    align-items: center;
    gap: 3rem;
    background: var(--primary-bg);
    border-radius: var(--border-radius);
    padding: 3rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    margin-bottom: 3rem;
}

.resume-preview {
    flex: 1;
}

.resume-thumbnail {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 2rem;
    background: var(--secondary-bg);
    border-radius: var(--border-radius);
    border: 2px dashed var(--border-color);
}

.resume-thumbnail i {
    font-size: 3rem;
    color: #9f2b68;
}

.resume-info h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.resume-info p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.file-size {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.resume-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    min-width: 200px;
}

.resume-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--primary-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.highlight-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.highlight-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--accent-color);
    color: white;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.highlight-content h4 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.highlight-content p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-on-scroll {
    animation: fadeInUp 0.6s ease-out;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--secondary-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-hover);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container > div {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-links {
        display: none;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3rem;
    }

    .hero-content {
        order: 2;
    }

    .hero-image {
        order: 1;
    }

    .profile-img {
        width: 250px;
        height: 250px;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .software-showcase, .resume-showcase {
        flex-direction: column;
        text-align: center;
        gap: 2rem;
    }

    .resume-highlights {
        grid-template-columns: 1fr;
    }

    .skills-container {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .contact-icons {
        flex-wrap: wrap;
        gap: 1rem;
    }

    :root {
        --section-padding: 3rem 1rem;
    }
}