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

:root {
    /* Colors */
    --primary-color: #3B82F6;
    --secondary-color: #14B8A6;
    --accent-color: #F97316;
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --error-color: #EF4444;
    
    /* Light Theme */
    --bg-color: #FFFFFF;
    --bg-secondary: #F8FAFC;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --border-color: #E2E8F0;
    --card-bg: #FFFFFF;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Typography */
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-color: #0F172A;
    --bg-secondary: #1E293B;
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --border-color: #334155;
    --card-bg: #1E293B;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
}

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

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: #2563EB;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-color);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity var(--transition-medium);
}

.loading-screen.fade-out {
    opacity: 0;
    pointer-events: none;
}

.loader {
    position: relative;
}

.loader-text {
    font-size: 3rem;
    font-weight: var(--font-weight-bold);
    color: var(--primary-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--space-sm) 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition-medium);
}

[data-theme="dark"] .navbar {
    background: rgba(15, 23, 42, 0.95);
}

.navbar.scrolled {
    padding: var(--space-xs) 0;
    box-shadow: var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo a {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-lg);
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

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

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

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: var(--space-xs);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--bg-secondary);
    transform: scale(1.1);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: var(--space-xs);
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition-fast);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--space-2xl) 0;
    background: linear-gradient(135deg, var(--bg-color) 0%, var(--bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23E2E8F0" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.5;
    z-index: -1;
}

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

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: center;
}

.hero-text {
    animation: slideInLeft 1s ease-out;
}

.greeting {
    display: block;
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.name {
    display: block;
    font-size: 3.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--accent-color);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-md);
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    font-size: 1rem;
    transition: all var(--transition-medium);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: #2563EB;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

/* Hero Image */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    animation: slideInRight 1s ease-out;
}

.profile-wrapper {
    position: relative;
}

.profile-image {
    width: 350px;
    height: 350px;
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--primary-color);
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 2;
}

.profile-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.floating-elements {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 500px;
    height: 500px;
    z-index: 1;
}

.float-item {
    position: absolute;
    width: 60px;
    height: 60px;
    background: var(--card-bg);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    box-shadow: var(--shadow);
    animation: float 3s ease-in-out infinite;
    cursor: pointer;
    transition: all var(--transition-medium);
}

.float-item:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
}

.float-item:nth-child(1) {
    top: 10%;
    right: 20%;
    color: #E34F26;
    animation-delay: 0s;
}

.float-item:nth-child(2) {
    top: 20%;
    left: 10%;
    color: #1572B6;
    animation-delay: -1s;
}

.float-item:nth-child(3) {
    bottom: 20%;
    right: 10%;
    color: #F7DF1E;
    animation-delay: -2s;
}

.float-item:nth-child(4) {
    bottom: 10%;
    left: 20%;
    color: #777BB4;
    animation-delay: -1.5s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

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

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-title {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* About Section */
.about {
    padding: var(--space-2xl) 0;
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    gap: var(--space-2xl);
}

.about-info {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-2xl);
    align-items: start;
}

.about-text p {
    margin-bottom: var(--space-md);
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.stats-grid {
    display: grid;
    gap: var(--space-md);
}

.stat-item {
    text-align: center;
    padding: var(--space-md);
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    transition: transform var(--transition-medium);
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--primary-color);
    margin-bottom: var(--space-xs);
}

.stat-label {
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

.skills-section h3 {
    font-size: 1.8rem;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
}

.skill-item {
    background: var(--card-bg);
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    text-align: center;
    transition: all var(--transition-medium);
}

.skill-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.skill-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
    color: var(--primary-color);
}

.skill-item h4 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.skill-item p {
    color: var(--text-secondary);
}

/* Projects Section */
.projects {
    padding: var(--space-2xl) 0;
}

.project-filters {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-2xl);
    flex-wrap: wrap;
}

.filter-btn {
    padding: var(--space-sm) var(--space-lg);
    border: none;
    background: transparent;
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--primary-color);
    color: white;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-lg);
}

.project-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition-medium);
}

.project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.project-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.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;
    width: 100%;
    height: 100%;
    background: rgba(59, 130, 246, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity var(--transition-medium);
}

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

.project-actions {
    display: flex;
    gap: var(--space-md);
}

.action-btn {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 50px;
    height: 50px;
    background: white;
    color: var(--primary-color);
    border-radius: 50%;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.action-btn:hover {
    transform: scale(1.1);
    background: var(--primary-color);
    color: white;
}

.project-info {
    padding: var(--space-lg);
}

.project-info h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.project-info p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.6;
}

.project-tech {
    display: flex;
    gap: var(--space-xs);
    flex-wrap: wrap;
}

.tech-tag {
    padding: var(--space-xs) var(--space-sm);
    background: var(--bg-secondary);
    color: var(--primary-color);
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
    font-weight: var(--font-weight-medium);
}

/* Contact Section */
.contact {
    padding: var(--space-2xl) 0;
    background: var(--bg-secondary);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    font-size: 1.2rem;
}

.contact-details h4 {
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-xs);
}

.contact-details p {
    color: var(--text-secondary);
}

.social-links {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.social-link {
    width: 50px;
    height: 50px;
    background: var(--card-bg);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 50%;
    text-decoration: none;
    font-size: 1.2rem;
    box-shadow: var(--shadow);
    transition: all var(--transition-medium);
}

.social-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

.contact-form {
    background: var(--card-bg);
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.form-group {
    margin-bottom: var(--space-lg);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-color);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-fast);
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
    min-height: 120px;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: var(--bg-color);
    padding: var(--space-xl) 0;
    text-align: center;
}

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

.admin-link {
    color: var(--bg-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.admin-link:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Animations */
@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--card-bg);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow-lg);
        border-radius: 0 0 var(--radius-lg) var(--radius-lg);
        padding: var(--space-lg) 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .name {
        font-size: 2.5rem;
    }

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

    .floating-elements {
        width: 350px;
        height: 350px;
    }

    .float-item {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .about-info {
        grid-template-columns: 1fr;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--space-md);
    }

    .hero-buttons {
        justify-content: center;
    }

    .project-filters {
        justify-content: center;
    }

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

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

@media (max-width: 480px) {
    .name {
        font-size: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .profile-image {
        width: 200px;
        height: 200px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .contact-form {
        padding: var(--space-lg);
    }
}

/* Utility Classes */
.fade-in {
    animation: fadeIn 0.6s ease-out;
}

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

.hidden {
    display: none;
}

.visible {
    display: block;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus styles for accessibility */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}