/* ===================================
   CSS Variables & Base Styles
   =================================== */
:root {
    /* Colors */
    --primary: #667eea;
    --primary-dark: #5a67d8;
    --secondary: #764ba2;
    --accent: #f093fb;
    --dark: #0f0f23;
    --dark-light: #1a1a2e;
    --dark-lighter: #16213e;
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --text-muted: #718096;
    --border-color: rgba(255, 255, 255, 0.1);
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-hover: rgba(255, 255, 255, 0.08);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    --gradient-accent: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
    --gradient-dark: linear-gradient(180deg, var(--dark) 0%, var(--dark-light) 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.2);
    --shadow-glow: 0 0 30px rgba(102, 126, 234, 0.3);
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;
    
    /* Spacing */
    --section-padding: 100px 0;
    --container-width: 1200px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-primary);
    background: var(--dark);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
}

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

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

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 15px 0;
    background: transparent;
    transition: var(--transition-normal);
}

.navbar.scrolled {
    background: rgba(15, 15, 35, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-md);
    padding: 10px 0;
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.8rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 5px 0;
}

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

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

.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: 5px;
}

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

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 100px 20px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 20% 50%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 50%, rgba(118, 75, 162, 0.15) 0%, transparent 50%),
                radial-gradient(ellipse at 50% 0%, rgba(240, 147, 251, 0.1) 0%, transparent 50%);
}

.floating-shapes {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: var(--gradient-primary);
    opacity: 0.1;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 400px;
    height: 400px;
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.shape-2 {
    width: 300px;
    height: 300px;
    bottom: -50px;
    left: -50px;
    animation-delay: -5s;
}

.shape-3 {
    width: 200px;
    height: 200px;
    top: 50%;
    left: 50%;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(30px, -30px) rotate(5deg); }
    50% { transform: translate(0, -50px) rotate(0deg); }
    75% { transform: translate(-30px, -30px) rotate(-5deg); }
}

.hero-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
    max-width: var(--container-width);
    width: 100%;
    position: relative;
    z-index: 1;
}

.hero-text {
    flex: 1;
    max-width: 600px;
}

.hero-greeting {
    font-size: 1.2rem;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 10px;
}

.hero-title {
    font-size: 3.5rem;
    font-family: var(--font-display);
    font-weight: 700;
    margin-bottom: 15px;
    line-height: 1.2;
}

.hero-title span {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-weight: 500;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 30px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    margin-bottom: 40px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: var(--transition-normal);
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5);
}

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

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.hero-social {
    display: flex;
    gap: 15px;
}

.social-link {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--text-secondary);
    transition: var(--transition-normal);
}

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

.hero-image {
    flex: 0 0 auto;
}

.image-wrapper {
    position: relative;
    width: 350px;
    height: 350px;
}

.image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    position: relative;
    z-index: 1;
}

.image-border {
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    border-radius: 50%;
    background: var(--gradient-primary);
    z-index: 0;
    animation: pulse 3s infinite ease-in-out;
}

@keyframes pulse {
    0%, 100% { opacity: 0.5; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.02); }
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: var(--text-muted);
    font-size: 0.85rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
    40% { transform: translateX(-50%) translateY(-10px); }
    60% { transform: translateX(-50%) translateY(-5px); }
}

/* ===================================
   Section Styles
   =================================== */
.section {
    padding: var(--section-padding);
    position: relative;
}

.section-title {
    font-size: 2.5rem;
    font-family: var(--font-display);
    text-align: center;
    margin-bottom: 20px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    margin: 15px auto 0;
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 50px;
}

/* ===================================
   About Section
   =================================== */
.about {
    background: var(--dark-light);
}

.about-content {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 60px;
    align-items: start;
    margin-top: 50px;
}

.about-image {
    position: sticky;
    top: 100px;
}

.about-image img {
    width: 100%;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
}

.about-text h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--primary);
}

.about-text p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 1.05rem;
}

.about-text p strong {
    color: var(--text-primary);
}

.about-info {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin: 30px 0;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
}

.info-item i {
    color: var(--primary);
    font-size: 1.1rem;
}

.skills-container {
    margin: 40px 0;
}

.skills-container h4 {
    font-size: 1.3rem;
    margin-bottom: 25px;
    color: var(--text-primary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}

.skill-category h5 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.skill-category h5 i {
    color: var(--primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    padding: 6px 14px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: var(--transition-normal);
}

.skill-tag:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* ===================================
   Education Section
   =================================== */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 50px auto 0;
    padding-left: 50px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gradient-primary);
}

.timeline-item {
    position: relative;
    margin-bottom: 50px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -50px;
    top: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-glow);
}

.timeline-content {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 15px;
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.timeline-content:hover {
    background: var(--card-hover);
    transform: translateX(10px);
}

.education-header {
    display: flex;
    gap: 20px;
    align-items: flex-start;
    margin-bottom: 15px;
}

.education-logo {
    flex-shrink: 0;
    width: 70px;
    height: 70px;
    border-radius: 12px;
    overflow: hidden;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
}

.education-logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 8px;
}

.education-logo .logo-placeholder {
    display: none;
    width: 100%;
    height: 100%;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    font-size: 1.8rem;
}

.education-info {
    flex: 1;
}

.education-info .timeline-date {
    margin-bottom: 10px;
}

.education-info h3 {
    font-size: 1.4rem;
    margin-bottom: 8px;
}

.education-info h4 {
    font-size: 1rem;
    color: var(--primary);
    font-weight: 500;
}

.timeline-date {
    display: inline-block;
    padding: 5px 15px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 15px;
}

.timeline-content h3 {
    font-size: 1.4rem;
    margin-bottom: 8px;
}

.timeline-content h4 {
    font-size: 1rem;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 15px;
}

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

.education-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-top: 20px;
}

.education-highlights span {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.education-highlights i {
    color: var(--primary);
}

/* ===================================
   Projects Section
   =================================== */
.projects {
    background: var(--dark-light);
}

.project-filters {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    margin-bottom: 25px;
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 22px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 25px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-normal);
}

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

.search-box {
    position: relative;
    min-width: 250px;
}

.search-box i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-box input {
    width: 100%;
    padding: 12px 15px 12px 45px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 25px;
    color: var(--text-primary);
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition-normal);
}

.search-box input:focus {
    border-color: var(--primary);
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.tag-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 40px;
}

.tag-filter {
    padding: 6px 16px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition-normal);
}

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

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

.project-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    overflow: hidden;
    transition: var(--transition-normal);
    position: relative;
}

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

.project-card.featured {
    grid-column: span 2;
}

.featured-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    padding: 6px 14px;
    background: var(--gradient-accent);
    color: white;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 20px;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 5px;
}

.media-badge {
    position: absolute;
    top: 15px;
    left: 15px;
    padding: 6px 14px;
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 20px;
    z-index: 10;
    display: flex;
    align-items: center;
    gap: 5px;
    animation: pulse-badge 2s infinite;
}

@keyframes pulse-badge {
    0%, 100% { box-shadow: 0 0 0 0 rgba(231, 76, 60, 0.4); }
    50% { box-shadow: 0 0 0 8px rgba(231, 76, 60, 0); }
}

.project-features {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 15px;
}

.project-features span {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.project-features i {
    color: var(--primary);
    font-size: 0.75rem;
}

.techpana-feature {
    color: #e74c3c;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 5px;
}

.techpana-feature:hover {
    color: #c0392b;
    text-decoration: underline;
}

.techpana-link {
    background: linear-gradient(135deg, #e74c3c, #c0392b) !important;
}

.project-image {
    position: relative;
    height: 200px;
    background: linear-gradient(135deg, var(--dark-lighter) 0%, var(--dark-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.project-placeholder {
    font-size: 4rem;
    color: var(--primary);
    opacity: 0.3;
}

.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: 15px;
    opacity: 0;
    transition: var(--transition-normal);
}

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

.project-link {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    transform: translateY(20px);
    transition: var(--transition-normal);
}

.project-card:hover .project-link {
    transform: translateY(0);
}

.project-link:hover {
    transform: scale(1.1);
}

.project-content {
    padding: 25px;
}

.project-category {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 15px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.project-date {
    float: right;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.project-content h3 {
    font-size: 1.3rem;
    margin: 15px 0 10px;
}

.project-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 15px;
}

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

.project-meta span {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.project-meta i {
    color: var(--primary);
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.project-tags .tag {
    padding: 4px 12px;
    background: var(--dark);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.project-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    font-weight: 600;
    font-size: 0.95rem;
}

.project-btn:hover {
    gap: 12px;
}

.project-btn.btn-outline {
    margin-left: 15px;
}

.project-links {
    display: flex;
    gap: 10px;
}

.no-results {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.no-results i {
    font-size: 3rem;
    margin-bottom: 15px;
    opacity: 0.3;
}

/* ===================================
   Achievements Section
   =================================== */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.achievement-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 30px;
    display: flex;
    gap: 20px;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.achievement-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
}

.achievement-card.gold::before {
    background: linear-gradient(180deg, #ffd700, #ffb800);
}

.achievement-card.silver::before {
    background: linear-gradient(180deg, #c0c0c0, #a0a0a0);
}

.achievement-card.bronze::before {
    background: linear-gradient(180deg, #cd7f32, #b8722d);
}

.achievement-card.mentor::before {
    background: var(--gradient-primary);
}

.achievement-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.achievement-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
}

.achievement-card.gold .achievement-icon {
    background: linear-gradient(135deg, #ffd700, #ffb800);
    color: #8b7400;
}

.achievement-card.silver .achievement-icon {
    background: linear-gradient(135deg, #e0e0e0, #c0c0c0);
    color: #505050;
}

.achievement-card.bronze .achievement-icon {
    background: linear-gradient(135deg, #cd7f32, #b8722d);
    color: #5a3515;
}

.achievement-card.mentor .achievement-icon {
    background: var(--gradient-primary);
    color: white;
}

.achievement-content {
    flex: 1;
}

.achievement-position {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.achievement-content h3 {
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.achievement-content p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.achievement-date {
    display: block;
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 500;
    margin: 10px 0;
}

.achievement-description {
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ===================================
   Activities Section
   =================================== */
.activities {
    background: var(--dark-light);
}

.activities-timeline {
    display: grid;
    gap: 30px;
    margin-top: 50px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.activity-card {
    display: flex;
    gap: 25px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 30px;
    transition: var(--transition-normal);
}

.activity-card:hover {
    background: var(--card-hover);
    transform: translateX(10px);
}

.activity-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.activity-date {
    text-align: center;
    background: var(--gradient-primary);
    padding: 15px;
    border-radius: 15px;
    min-width: 70px;
}

.activity-date .month {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
}

.activity-date .year {
    display: block;
    font-size: 1.2rem;
    font-weight: 700;
}

.activity-badge {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

.activity-badge.hackathon {
    background: rgba(234, 179, 8, 0.2);
    color: #eab308;
}

.activity-badge.school {
    background: rgba(59, 130, 246, 0.2);
    color: #3b82f6;
}

.activity-badge.mentorship {
    background: rgba(34, 197, 94, 0.2);
    color: #22c55e;
}

.activity-content {
    flex: 1;
}

.activity-content h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.activity-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 15px;
}

.activity-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
}

.activity-tags span {
    padding: 4px 12px;
    background: var(--dark);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.view-certificate-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: transparent;
    border: 1px solid var(--primary);
    border-radius: 20px;
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-normal);
}

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

/* ===================================
   Certificates Section
   =================================== */
.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.certificate-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    overflow: hidden;
    transition: var(--transition-normal);
}

.certificate-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.certificate-header {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 25px;
    background: var(--dark-lighter);
    border-bottom: 1px solid var(--border-color);
}

.certificate-logo {
    width: 50px;
    height: 50px;
    border-radius: 10px;
    object-fit: contain;
    background: white;
    padding: 5px;
}

.certificate-provider span {
    display: block;
    font-weight: 600;
    font-size: 1rem;
}

.certificate-platform {
    color: var(--text-muted);
    font-size: 0.85rem !important;
    font-weight: 400 !important;
}

.certificate-content {
    padding: 25px;
}

.certificate-content h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.certificate-date {
    display: block;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.certificate-courses {
    list-style: none;
    margin-bottom: 20px;
}

.certificate-courses li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border-color);
}

.certificate-courses li:last-child {
    border-bottom: none;
}

.certificate-courses i {
    color: var(--primary);
    margin-top: 4px;
}

/* ===================================
   Publications Section
   =================================== */
.publications {
    background: var(--dark-light);
}

.publications-list {
    max-width: 800px;
    margin: 50px auto 0;
}

.publication-card {
    display: flex;
    gap: 25px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 20px;
}

.publication-card.coming-soon {
    border-style: dashed;
    opacity: 0.8;
}

.publication-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    flex-shrink: 0;
}

.publication-content {
    flex: 1;
}

.publication-status {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(234, 179, 8, 0.2);
    color: #eab308;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.publication-content h3 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.publication-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.publication-venue {
    color: var(--primary-color) !important;
    font-weight: 500;
    margin-bottom: 8px;
}

.publication-venue i {
    margin-right: 6px;
}

.publication-status.published {
    background: rgba(34, 197, 94, 0.2);
    color: #22c55e;
}

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

.publication-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-normal);
}

.publication-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.research-interests {
    max-width: 800px;
    margin: 50px auto 0;
    text-align: center;
}

.research-interests h3 {
    font-size: 1.5rem;
    margin-bottom: 25px;
}

.interest-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
}

.interest-tag {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: var(--transition-normal);
}

.interest-tag:hover {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
}

.interest-tag i {
    color: var(--primary);
}

.interest-tag:hover i {
    color: white;
}

/* ===================================
   Contact Section
   =================================== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-top: 50px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.contact-item {
    display: flex;
    gap: 20px;
    padding: 25px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    transition: var(--transition-normal);
}

.contact-item:hover {
    background: var(--card-hover);
    transform: translateX(10px);
}

.contact-icon {
    width: 55px;
    height: 55px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: white;
    flex-shrink: 0;
}

.contact-details h4 {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 5px;
}

.contact-details a,
.contact-details span {
    font-size: 1rem;
    color: var(--text-primary);
}

.contact-details a:hover {
    color: var(--primary);
}

.contact-social {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.contact-social h4 {
    font-size: 1.3rem;
    margin-bottom: 25px;
    text-align: center;
}

.social-links {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.social-btn {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 18px 25px;
    border-radius: 15px;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition-normal);
}

.social-btn.github {
    background: #24292e;
    color: white;
}

.social-btn.linkedin {
    background: #0077b5;
    color: white;
}

.social-btn.twitter {
    background: #000000;
    color: white;
}

.social-btn.huggingface {
    background: linear-gradient(135deg, #ff9d00, #ffcc00);
    color: #1a1a1a;
}

/* Hugging Face emoji styling */
.hf-emoji {
    font-size: 1.2em;
    line-height: 1;
}

.social-link .hf-emoji {
    font-size: 1.3rem;
}

.social-btn .hf-emoji {
    font-size: 1.4rem;
}

.footer-social .hf-emoji {
    font-size: 1.1rem;
}

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

.social-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.social-btn i {
    font-size: 1.3rem;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--dark-light);
    padding: 60px 0 30px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 40px;
}

.footer-logo span {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-logo p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 5px;
}

.footer-links {
    display: flex;
    gap: 30px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

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

.footer-social {
    display: flex;
    gap: 15px;
}

.footer-social a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: var(--transition-normal);
}

.footer-social a:hover {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
}

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

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===================================
   Back to Top Button
   =================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: white;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
}

/* ===================================
   Modal
   =================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--dark-light);
    border-radius: 20px;
    max-width: 800px;
    max-height: 90vh;
    overflow: auto;
    position: relative;
    transform: scale(0.9);
    transition: var(--transition-normal);
}

.modal.active .modal-content {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 20px;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 2rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.modal-close:hover {
    color: var(--primary);
}

.modal-body {
    padding: 40px;
    text-align: center;
}

.modal-body img {
    max-width: 100%;
    border-radius: 10px;
}

#certificate-placeholder {
    color: var(--text-muted);
    padding: 60px 20px;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .hero-content {
        flex-direction: column-reverse;
        text-align: center;
    }
    
    .hero-text {
        max-width: 100%;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-social {
        justify-content: center;
    }
    
    .image-wrapper {
        width: 280px;
        height: 280px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        position: static;
        max-width: 300px;
        margin: 0 auto;
    }
    
    .project-card.featured {
        grid-column: span 1;
    }
    
    .certificates-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        height: 100vh;
        background: var(--dark-light);
        flex-direction: column;
        padding: 80px 30px 30px;
        gap: 20px;
        transition: var(--transition-normal);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-toggle {
        display: flex;
        z-index: 1001;
    }
    
    .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(5px, -5px);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    .project-filters {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-group {
        justify-content: center;
    }
    
    .search-box {
        min-width: 100%;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .activity-card {
        flex-direction: column;
    }
    
    .activity-header {
        flex-direction: row;
        justify-content: flex-start;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 80px 15px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .image-wrapper {
        width: 220px;
        height: 220px;
    }
    
    .timeline {
        padding-left: 40px;
    }
    
    .timeline::before {
        left: 15px;
    }
    
    .timeline-marker {
        left: -40px;
        width: 30px;
        height: 30px;
        font-size: 0.8rem;
    }
    
    .timeline-content {
        padding: 20px;
    }
    
    .achievement-card {
        flex-direction: column;
        text-align: center;
    }
    
    .achievement-icon {
        margin: 0 auto;
    }
}

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

.fade-in-up {
    animation: fadeInUp 0.6s ease forwards;
}

/* Staggered animation for grid items */
.projects-grid .project-card,
.achievements-grid .achievement-card,
.activities-timeline .activity-card,
.certificates-grid .certificate-card {
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.projects-grid .project-card:nth-child(1) { animation-delay: 0.1s; }
.projects-grid .project-card:nth-child(2) { animation-delay: 0.2s; }
.projects-grid .project-card:nth-child(3) { animation-delay: 0.3s; }
.projects-grid .project-card:nth-child(4) { animation-delay: 0.4s; }
.projects-grid .project-card:nth-child(5) { animation-delay: 0.5s; }
.projects-grid .project-card:nth-child(6) { animation-delay: 0.6s; }
.projects-grid .project-card:nth-child(7) { animation-delay: 0.7s; }

.achievements-grid .achievement-card:nth-child(1) { animation-delay: 0.1s; }
.achievements-grid .achievement-card:nth-child(2) { animation-delay: 0.2s; }
.achievements-grid .achievement-card:nth-child(3) { animation-delay: 0.3s; }
.achievements-grid .achievement-card:nth-child(4) { animation-delay: 0.4s; }

/* Hidden state for filtered items */
.project-card.hidden {
    display: none;
}

/* Smooth transitions for filtering */
.projects-grid {
    transition: height 0.4s ease;
}