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

:root {
    --primary: #6c63ff;
    --primary-dark: #554fd8;
    --secondary: #00d9ff;
    --accent: #ff6b9d;
    --dark: #0a0a0f;
    --darker: #050508;
    --light: #ffffff;
    --gray: #8a8aa3;
    --light-gray: #f5f5fa;
    --card-bg: rgba(255, 255, 255, 0.03);
    --card-border: rgba(255, 255, 255, 0.08);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme */
.light-theme {
    --dark: #ffffff;
    --darker: #f5f5fa;
    --light: #0a0a0f;
    --gray: #666680;
    --light-gray: #1a1a2e;
    --card-bg: rgba(0, 0, 0, 0.03);
    --card-border: rgba(0, 0, 0, 0.08);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--dark);
    color: var(--light);
    line-height: 1.6;
    overflow-x: hidden;
    transition: var(--transition);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--dark);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

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

.loading-spinner {
    text-align: center;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 3px solid rgba(108, 99, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    100% { transform: rotate(360deg); }
}

.loading-spinner p {
    color: var(--primary);
    font-weight: 500;
}

/* Cursor */
.cursor {
    width: 10px;
    height: 10px;
    background: var(--primary);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: 999;
    transition: transform 0.2s;
}

.cursor-follower {
    width: 30px;
    height: 30px;
    border: 2px solid var(--primary);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: 998;
    transition: transform 0.4s;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 20px 0;
    border-bottom: 1px solid var(--card-border);
    transition: var(--transition);
}

.light-theme .navbar {
    background: rgba(255, 255, 255, 0.9);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-text {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    color: white;
}

.logo-name {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.first-name {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--light);
}

.last-name {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray);
}

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

.nav-link {
    text-decoration: none;
    color: var(--gray);
    font-weight: 500;
    position: relative;
    padding: 5px 0;
    transition: var(--transition);
}

.nav-link span {
    position: relative;
    z-index: 1;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    transition: var(--transition);
}

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

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

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--light);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.theme-toggle:hover {
    background: var(--primary);
    transform: rotate(15deg);
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--light);
    border-radius: 2px;
    transition: var(--transition);
}

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

.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

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

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

.subtitle {
    color: var(--primary);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.typing-text {
    color: var(--gray);
    font-weight: 600;
}

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

.hero-buttons {
    display: flex;
    gap: 20px;
    margin-bottom: 40px;
}

.btn {
    padding: 15px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn span {
    position: relative;
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 100%;
    transition: var(--transition);
}

.btn:hover::before {
    width: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
}

.btn-primary::before {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
}

.btn-outline {
    background: transparent;
    color: var(--light);
    border: 2px solid var(--card-border);
}

.btn-outline::before {
    background: var(--primary);
}

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

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

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

.social-icon:hover {
    background: var(--primary);
    transform: translateY(-5px);
}

.hero-image {
    position: relative;
}

.image-container {
    position: relative;
    width: 400px;
    height: 400px;
    margin: 0 auto;
}

.main-image {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    overflow: hidden;
    position: relative;
}

.main-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(0.1);
    transition: var(--transition);
}

.main-image:hover img {
    transform: scale(1.05);
    filter: grayscale(0);
}

.image-border {
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    border: 2px solid transparent;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary)) border-box;
    -webkit-mask: 
        linear-gradient(#fff 0 0) padding-box, 
        linear-gradient(#fff 0 0);
    mask: 
        linear-gradient(#fff 0 0) padding-box, 
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
}

.floating-card {
    position: absolute;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    padding: 15px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    width: 100px;
    animation: float 6s ease-in-out infinite;
}

.floating-card i {
    font-size: 1.5rem;
    color: var(--primary);
}

.floating-card span {
    font-size: 0.8rem;
    font-weight: 600;
}

.card-1 {
    top: 10%;
    left: -10%;
    animation-delay: 0s;
}

.card-2 {
    top: 60%;
    right: -10%;
    animation-delay: 2s;
}

.card-3 {
    bottom: 10%;
    left: 20%;
    animation-delay: 4s;
}

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

.experience-badge {
    position: absolute;
    bottom: -20px;
    right: -20px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 20px;
    padding: 15px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    box-shadow: var(--shadow);
}

.years {
    font-size: 2rem;
    font-weight: 800;
    color: white;
}

.text {
    font-size: 0.8rem;
    color: white;
    opacity: 0.9;
}

.stats-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-top: 80px;
    padding-top: 40px;
    border-top: 1px solid var(--card-border);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 10px;
}

.stat-label {
    color: var(--gray);
    font-weight: 500;
}

/* Section Styles */
.section-padding {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-subtitle {
    color: var(--primary);
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 15px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 20px;
}

.highlight {
    color: var(--primary);
}

.section-line {
    width: 60px;
    height: 4px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    margin: 0 auto;
    border-radius: 2px;
}

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

.about-image {
    position: relative;
}

.image-frame {
    position: relative;
    width: 400px;
    height: 500px;
    margin: 0 auto;
}

.image-bg {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 20px;
    z-index: 0;
}

.image-frame img {
    position: relative;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 20px;
    z-index: 1;
    transition: var(--transition);
}

.image-frame:hover img {
    transform: translate(-10px, -10px);
}

.about-text h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.about-text p {
    color: var(--gray);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin: 30px 0;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 15px;
}

.detail-label {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    font-weight: 600;
}

.detail-label i {
    font-size: 1.2rem;
}

.detail-value {
    color: var(--light);
    font-weight: 500;
}

.mission-vision {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 40px;
}

.mission, .vision {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    padding: 25px;
    transition: var(--transition);
}

.mission:hover, .vision:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
}

.mission h4, .vision h4 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    color: var(--primary);
}

.mission p, .vision p {
    color: var(--gray);
    margin: 0;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.skill-category {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 30px;
    transition: var(--transition);
}

.skill-category:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 30px;
}

.category-header i {
    font-size: 2rem;
    color: var(--primary);
}

.category-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
}

.skill-items {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.skill-item {
    margin-bottom: 10px;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
}

.skill-info span:first-child {
    color: var(--light);
    font-weight: 600;
}

.skill-info span:last-child {
    color: var(--primary);
    font-weight: 600;
}

.skill-bar {
    height: 8px;
    background: var(--card-border);
    border-radius: 4px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    border-radius: 4px;
    width: 0;
    transition: width 1.5s ease;
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary), var(--secondary));
}

.timeline-item {
    position: relative;
    margin-bottom: 50px;
    padding-left: 80px;
}

.timeline-date {
    position: absolute;
    left: 0;
    top: 0;
    background: var(--primary);
    color: white;
    padding: 8px 15px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

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

.timeline-content:hover {
    border-color: var(--primary);
    transform: translateX(10px);
}

.timeline-header {
    margin-bottom: 20px;
}

.timeline-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.institution {
    color: var(--primary);
    font-weight: 600;
}

.achievements, .courses {
    margin-top: 20px;
}

.achievements h4, .courses h4 {
    color: var(--light);
    margin-bottom: 10px;
}

.achievements ul {
    list-style: none;
    padding-left: 20px;
}

.achievements li {
    color: var(--gray);
    margin-bottom: 8px;
    position: relative;
}

.achievements li::before {
    content: '▹';
    color: var(--primary);
    position: absolute;
    left: -20px;
}

.course-tags, .tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.course-tags span, .tech-tags span {
    background: rgba(108, 99, 255, 0.1);
    color: var(--primary);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    border: 1px solid rgba(108, 99, 255, 0.2);
}

/* Research Section */
.research-main {
    max-width: 1000px;
    margin: 0 auto;
}

.research-card.featured {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    overflow: hidden;
    margin-bottom: 60px;
    transition: var(--transition);
}

.research-card.featured:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
}

.research-header {
    padding: 30px;
    background: linear-gradient(135deg, rgba(108, 99, 255, 0.1), rgba(0, 217, 255, 0.1));
    border-bottom: 1px solid var(--card-border);
}

.university-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--primary);
    color: white;
    padding: 8px 15px;
    border-radius: 20px;
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.research-header h3 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.research-subtitle {
    color: var(--gray);
    font-size: 1.1rem;
}

.research-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    padding: 40px;
}

.research-image {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    height: 300px;
}

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

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

.image-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.research-image:hover .image-overlay {
    opacity: 1;
}

.image-overlay i {
    color: white;
    font-size: 2rem;
}

.research-info {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
    margin-bottom: 20px;
}

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

.info-item i {
    color: var(--primary);
}

.research-abstract {
    color: var(--gray);
    line-height: 1.8;
    margin-bottom: 20px;
}

.research-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 30px;
}

.research-tags span {
    background: rgba(108, 99, 255, 0.1);
    color: var(--primary);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    border: 1px solid rgba(108, 99, 255, 0.2);
}

.research-actions {
    display: flex;
    gap: 15px;
}

.other-research h3 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 30px;
    text-align: center;
}

.interest-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.interest-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    padding: 25px;
    text-align: center;
    transition: var(--transition);
}

.interest-card:hover {
    border-color: var(--primary);
    transform: translateY(-5px);
}

.interest-icon {
    width: 60px;
    height: 60px;
    background: rgba(108, 99, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.interest-icon i {
    font-size: 1.5rem;
    color: var(--primary);
}

.interest-card h4 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.interest-card p {
    color: var(--gray);
    font-size: 0.9rem;
    margin: 0;
}

/* Portfolio Section */
.portfolio-filter {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 25px;
    background: transparent;
    border: 2px solid var(--card-border);
    color: var(--gray);
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

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

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.portfolio-item {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    overflow: hidden;
    transition: var(--transition);
    opacity: 0;
    transform: translateY(20px);
}

.portfolio-item.show {
    opacity: 1;
    transform: translateY(0);
}

.portfolio-item:hover {
    border-color: var(--primary);
    transform: translateY(-10px);
}

.portfolio-image {
    height: 200px;
    overflow: hidden;
}

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

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

.portfolio-content {
    padding: 25px;
}

.portfolio-category {
    display: inline-block;
    background: rgba(108, 99, 255, 0.1);
    color: var(--primary);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.portfolio-content h4 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.portfolio-content p {
    color: var(--gray);
    margin-bottom: 20px;
    line-height: 1.6;
}

.portfolio-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.portfolio-tags span {
    background: rgba(108, 99, 255, 0.05);
    color: var(--gray);
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 0.8rem;
    border: 1px solid var(--card-border);
}

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

.portfolio-link:hover {
    gap: 12px;
}

.view-more {
    text-align: center;
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.info-card {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 15px;
    padding: 25px;
    transition: var(--transition);
}

.info-card:hover {
    border-color: var(--primary);
    transform: translateX(10px);
}

.info-icon {
    width: 50px;
    height: 50px;
    background: rgba(108, 99, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.info-icon i {
    font-size: 1.5rem;
    color: var(--primary);
}

.info-content h4 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.info-content p {
    color: var(--gray);
    margin: 0;
}

.contact-social h4 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.contact-social .social-icons {
    justify-content: flex-start;
}

.contact-form .form-group {
    margin-bottom: 25px;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 15px 20px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    color: var(--light);
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    transition: var(--transition);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
    color: var(--gray);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(108, 99, 255, 0.2);
}

.contact-form textarea {
    resize: vertical;
    min-height: 150px;
}

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

.footer-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.footer-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
}

.footer-logo span:first-child {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    font-weight: 800;
    color: white;
}

.footer-name {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
    text-align: left;
}

.footer-name span:first-child {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--light);
}

.footer-name span:last-child {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray);
}

.footer-text {
    color: var(--gray);
    margin-bottom: 30px;
    line-height: 1.8;
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
}

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

.footer-social a:hover {
    background: var(--primary);
    transform: translateY(-5px);
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid var(--card-border);
    color: var(--gray);
    font-size: 0.9rem;
}

.footer-bottom p:first-child {
    margin-bottom: 10px;
}

.fa-heart {
    color: var(--accent);
    margin: 0 5px;
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

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

/* Responsive Design */
@media (max-width: 1024px) {
    .hero-content,
    .about-content,
    .contact-content,
    .research-body {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .skills-grid,
    .interest-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        padding-left: 60px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        background: var(--dark);
        flex-direction: column;
        align-items: center;
        padding: 40px 0;
        gap: 30px;
        transition: var(--transition);
        z-index: 999;
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
    
    .title {
        font-size: 2.5rem;
    }
    
    .image-container {
        width: 300px;
        height: 300px;
    }
    
    .floating-card {
        width: 80px;
        padding: 10px;
    }
    
    .stats-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .about-details,
    .mission-vision {
        grid-template-columns: 1fr;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-social .social-icons {
        justify-content: center;
    }
}

@media (max-width: 576px) {
    .title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .skills-grid,
    .interest-grid {
        grid-template-columns: 1fr;
    }
    
    .research-actions {
        flex-direction: column;
    }
    
    .filter-btn {
        width: 100%;
        max-width: 200px;
    }
}