/* ============================================
   GLOBAL STYLES & RESET
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors - No Gradients, Solid Colors Only */
    --primary-color: #8B5CF6;
    --secondary-color: #EC4899;
    --dark-bg: #0F172A;
    --darker-bg: #020617;
    --card-bg: #1E293B;
    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --accent-blue: #3B82F6;
    --success: #10B981;
    --warning: #F59E0B;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --section-padding: 100px 0;
    --container-max-width: 1200px;
    
    /* Transitions */
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    padding: 20px 0;
    z-index: 1000;
    transition: var(--transition-smooth);
}

.navbar.scrolled {
    padding: 15px 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

.nav-brand a {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition-smooth);
}

.nav-brand .dot {
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-smooth);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition-smooth);
}

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

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--text-primary);
    transition: var(--transition-smooth);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 60px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background-color: var(--primary-color);
    opacity: 0.05;
    border-radius: 50%;
    animation: pulse 10s ease-in-out infinite;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 48px;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

.btn {
    padding: 14px 32px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition-smooth);
    border: none;
    cursor: pointer;
    font-size: 16px;
}

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

.btn-primary:hover {
    background-color: #7C3AED;
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(139, 92, 246, 0.4);
}

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

.btn-secondary:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.hero-image img {
    width: 100%;
    max-width: 500px;
    animation: float-animation 6s ease-in-out infinite;
}

.scroll-indicator {
    text-align: center;
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-indicator i {
    font-size: 30px;
    color: var(--primary-color);
    display: block;
    margin-bottom: 10px;
}

.scroll-indicator p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes float-animation {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.05; }
    50% { transform: scale(1.1); opacity: 0.08; }
}

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeInUp 1s ease-out;
}

.fade-in-delay {
    animation: fadeInUp 1s ease-out 0.2s both;
}

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

/* ============================================
   SECTIONS
   ============================================ */
section {
    padding: var(--section-padding);
}

.section-title {
    font-size: 42px;
    text-align: center;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 18px;
    margin-bottom: 60px;
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about {
    background-color: var(--darker-bg);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    align-items: center;
}

.about-image img {
    width: 100%;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    transition: var(--transition-smooth);
}

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

.about-text p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.about-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 30px 0;
}

.skill-tag {
    background-color: var(--card-bg);
    padding: 10px 20px;
    border-radius: 25px;
    font-size: 14px;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    transition: var(--transition-smooth);
}

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

.mission {
    font-size: 16px;
    line-height: 1.8;
    padding: 20px;
    background-color: var(--card-bg);
    border-left: 4px solid var(--primary-color);
    border-radius: 8px;
}

/* ============================================
   SKILLS SECTION
   ============================================ */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.skill-card {
    background-color: var(--card-bg);
    padding: 40px 30px;
    border-radius: 16px;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
}

.skill-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-color);
    box-shadow: 0 20px 40px rgba(139, 92, 246, 0.2);
}

.skill-icon {
    width: 70px;
    height: 70px;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    font-size: 32px;
    margin-bottom: 25px;
}

.skill-card h3 {
    font-size: 22px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.skill-list {
    list-style: none;
}

.skill-list li {
    padding: 10px 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.skill-list li i {
    color: var(--primary-color);
    font-size: 12px;
}

/* ============================================
   SERVICES SECTION
   ============================================ */
.services {
    background-color: var(--darker-bg);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.service-card {
    background-color: var(--card-bg);
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
}

.service-card:hover {
    transform: translateY(-10px);
    border-color: var(--secondary-color);
    box-shadow: 0 20px 40px rgba(236, 72, 153, 0.2);
}

.service-icon {
    width: 80px;
    height: 80px;
    background-color: var(--secondary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 36px;
    margin: 0 auto 25px;
}

.service-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.service-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   PORTFOLIO SECTION
   ============================================ */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.portfolio-card {
    background-color: var(--card-bg);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.portfolio-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

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

.portfolio-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

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

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(139, 92, 246, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition-smooth);
}

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

.portfolio-link {
    width: 50px;
    height: 50px;
    background-color: white;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 20px;
    transition: var(--transition-smooth);
}

.portfolio-link:hover {
    transform: scale(1.2) rotate(360deg);
}

.portfolio-info {
    padding: 25px;
}

.portfolio-info h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.portfolio-info p {
    color: var(--text-secondary);
    margin-bottom: 15px;
}

.portfolio-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.portfolio-tags span {
    background-color: var(--dark-bg);
    color: var(--primary-color);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
}

/* ============================================
   BLOG SECTION
   ============================================ */
.blog {
    background-color: var(--darker-bg);
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.blog-card {
    background-color: var(--card-bg);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.blog-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.blog-image {
    position: relative;
    height: 220px;
    overflow: hidden;
}

.blog-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

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

.blog-date {
    position: absolute;
    top: 15px;
    right: 15px;
    background-color: var(--primary-color);
    color: white;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
}

.blog-content {
    padding: 25px;
}

.blog-content h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.blog-content p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
}

.read-more {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition-smooth);
}

.read-more:hover {
    gap: 15px;
}

/* ============================================
   PUBLICATIONS SECTION
   ============================================ */
.publications-list {
    max-width: 900px;
    margin: 0 auto;
}

.publication-card {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 16px;
    margin-bottom: 25px;
    display: flex;
    gap: 25px;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
}

.publication-card:hover {
    border-color: var(--accent-blue);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.2);
}

.publication-icon {
    width: 60px;
    height: 60px;
    background-color: var(--accent-blue);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-size: 24px;
    flex-shrink: 0;
}

.publication-content h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.publication-meta {
    display: flex;
    gap: 20px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.publication-meta span {
    color: var(--text-secondary);
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.publication-meta i {
    color: var(--accent-blue);
}

.publication-content p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 15px;
}

.publication-links {
    display: flex;
    gap: 15px;
}

.pub-link {
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition-smooth);
}

.pub-link:hover {
    color: var(--primary-color);
}

/* ============================================
   TESTIMONIALS SECTION
   ============================================ */
.testimonials {
    background-color: var(--darker-bg);
}

.testimonials-slider {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.testimonial-card {
    background-color: var(--card-bg);
    padding: 35px;
    border-radius: 16px;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
}

.testimonial-card:hover {
    border-color: var(--secondary-color);
    box-shadow: 0 10px 30px rgba(236, 72, 153, 0.2);
}

.stars {
    display: flex;
    gap: 5px;
    margin-bottom: 20px;
}

.stars i {
    color: #FCD34D;
    font-size: 18px;
}

.testimonial-text {
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
    font-style: italic;
    margin-bottom: 25px;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 15px;
}

.testimonial-author img,
.author-initial {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}

.author-initial {
    background-color: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
}

.author-info h4 {
    font-size: 16px;
    color: var(--text-primary);
    margin-bottom: 3px;
}

.author-info p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    max-width: 1100px;
    margin: 0 auto;
}

.contact-item {
    display: flex;
    gap: 20px;
    margin-bottom: 30px;
}

.contact-icon {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-size: 24px;
    flex-shrink: 0;
}

.contact-item h3 {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 5px;
}

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

.contact-form {
    background-color: var(--card-bg);
    padding: 40px;
    border-radius: 16px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    background-color: var(--dark-bg);
    border: 2px solid transparent;
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 15px;
    transition: var(--transition-smooth);
}

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

.form-group textarea {
    resize: vertical;
}

.form-message {
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    display: none;
}

.form-message.success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success);
    border: 1px solid var(--success);
    display: block;
}

.form-message.error {
    background-color: rgba(239, 68, 68, 0.1);
    color: #EF4444;
    border: 1px solid #EF4444;
    display: block;
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background-color: var(--darker-bg);
    padding: 60px 0 30px;
    border-top: 1px solid var(--card-bg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-about h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.footer-about p {
    color: var(--text-secondary);
}

.footer-links h4,
.footer-contact h4 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-smooth);
}

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

.footer-contact p {
    color: var(--text-secondary);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-contact i {
    color: var(--primary-color);
    width: 20px;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--card-bg);
}

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

/* ============================================
   SCROLL TO TOP BUTTON
   ============================================ */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
    z-index: 999;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background-color: var(--secondary-color);
    transform: translateY(-5px);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 968px) {
    .hamburger {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        flex-direction: column;
        background-color: var(--card-bg);
        width: 100%;
        padding: 30px;
        transition: var(--transition-smooth);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hero-content,
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .hero-image {
        text-align: center;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .section-title {
        font-size: 32px;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px 0;
    }
    
    .hero {
        padding: 100px 0 40px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        justify-content: center;
    }
    
    .skills-grid,
    .services-grid,
    .portfolio-grid,
    .blog-grid,
    .testimonials-slider {
        grid-template-columns: 1fr;
    }
    
    .publication-card {
        flex-direction: column;
    }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

.hidden {
    display: none;
}

/* Scroll Animation */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}