/* CSS Variables */
:root {
    --primary-color: #0066cc; /* tech-blue */
    --success-color: #28a745; /* success-green */
    --info-color: #17a2b8; /* sky-blue */
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --white: #ffffff;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--light-color);
}

/* Navigation */
#navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    transition: var(--transition);
    border-bottom: 1px solid var(--gray-200);
}

#navbar.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: var(--box-shadow);
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

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

.nav-links li {
    margin-left: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 500;
    transition: var(--transition);
}

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

.hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray-700);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--info-color) 100%);
    color: var(--white);
    text-align: center;
    padding: 2rem;
}

.hero-content {
    max-width: 800px;
    animation: fadeInUp 1s ease-out;
}

.hero-photo {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 2rem;
    border: 5px solid var(--white);
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.summary {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.metrics {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.metric {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.metric .number {
    font-size: 2rem;
    font-weight: bold;
    color: var(--success-color);
}

.metric .label {
    font-size: 0.9rem;
    opacity: 0.8;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--success-color);
    color: var(--white);
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #218838;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(40, 167, 69, 0.3);
}

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

.linkedin-btn:hover {
    background-color: #005885;
}

/* Sections */
.section {
    padding: 5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--gray-900);
    position: relative;
}

.section h2::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 1rem auto 0;
}

/* News Carousel */
.news-section {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 2rem 0;
}

.news-carousel {
    display: flex;
    overflow: hidden;
    scroll-behavior: smooth;
    flex: 1;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.news-item {
    width: 100%;
    flex-shrink: 0;
    display: flex;
    height: 450px;
    background: var(--white);
}

.news-image-wrapper {
    width: 50%;
    height: 100%;
    background: var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.news-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    max-width: 100%;
    max-height: 100%;
}

.news-content {
    width: 50%;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.news-content h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.news-content p {
    line-height: 1.6;
    color: var(--gray-700);
}

.nav-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem;
    cursor: pointer;
    border-radius: var(--border-radius);
    font-size: 1.5rem;
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-btn:hover {
    background: #0055aa;
}

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

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

.timeline-item {
    margin-bottom: 2rem;
    position: relative;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 20px;
    width: 20px;
    height: 20px;
    background-color: var(--primary-color);
    border-radius: 50%;
    border: 4px solid var(--white);
    z-index: 1;
}

.timeline-content {
    margin-left: 80px;
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.timeline-content h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.company {
    font-weight: bold;
    color: var(--gray-700);
}

.period {
    color: var(--gray-600);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.achievements {
    margin-top: 1rem;
}

.badge {
    display: inline-block;
    background-color: var(--info-color);
    color: var(--white);
    padding: 0.25rem 0.5rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

/* Skills */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.skill-category h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.skill-item {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    background: var(--white);
    padding: 1rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.skill-name {
    flex: 1;
    font-weight: 500;
}

.progress-bar {
    flex: 2;
    height: 8px;
    background-color: var(--gray-200);
    border-radius: 4px;
    overflow: hidden;
    margin: 0 1rem;
}

.progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
    border-radius: 4px;
    width: 0%;
    transition: width 1s ease-out;
}

.skill-percent {
    font-size: 0.9rem;
    color: var(--gray-600);
    min-width: 40px;
    text-align: right;
}

/* Projects */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    text-align: center;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.project-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.project-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.project-metrics {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 1rem 0;
    flex-wrap: wrap;
}

.metric {
    background-color: var(--gray-100);
    padding: 0.5rem;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--gray-700);
}

.project-tags {
    margin-top: 1rem;
}

.tag {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--white);
    padding: 0.25rem 0.5rem;
    border-radius: 15px;
    font-size: 0.8rem;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
}

/* Publications */
.publications-list {
    max-width: 800px;
    margin: 0 auto;
}

.publication-item {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 1rem;
}

.publication-item h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.publication-item h3 a {
    text-decoration: none;
    color: inherit;
}

.publication-item h3 a:hover {
    text-decoration: underline;
}

.publication-meta {
    color: var(--gray-600);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

/* Contact Form */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--gray-700);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    font-family: var(--font-family);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.submit-btn {
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
}

/* Admin */
.admin {
    padding-top: 8rem;
}

.submissions-count {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: var(--gray-600);
}

.submissions-list {
    display: grid;
    gap: 1rem;
}

.submission-item {
    background: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.submission-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.submission-header h3 {
    color: var(--primary-color);
}

.subject-badge {
    padding: 0.25rem 0.5rem;
    border-radius: 15px;
    font-size: 0.8rem;
    color: var(--white);
}

.subject-judging {
    background-color: var(--warning-color);
}

.subject-collaboration {
    background-color: var(--success-color);
}

.subject-speaking {
    background-color: var(--info-color);
}

.subject-other {
    background-color: var(--gray-600);
}

.email {
    color: var(--gray-600);
    margin-bottom: 1rem;
}

.message {
    line-height: 1.5;
}

/* Footer */
.footer {
    background-color: var(--gray-900);
    color: var(--white);
    text-align: center;
    padding: 2rem;
}

.footer-links {
    margin-top: 1rem;
}

.footer-links a {
    color: var(--gray-400);
    text-decoration: none;
    margin: 0 1rem;
    transition: var(--transition);
}

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

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

.nav-links a i {
    margin-right: 0.5rem;
    width: 1rem;
    height: 1rem;
    vertical-align: middle;
}

.metric i {
    margin-bottom: 0.5rem;
    width: 1.5rem;
    height: 1.5rem;
    color: var(--success-color);
}

.project-icon i {
    width: 3rem;
    height: 3rem;
    color: var(--primary-color);
}

.linkedin-btn svg {
    margin-right: 0.5rem;
    width: 1rem;
    height: 1rem;
    vertical-align: middle;
}

/* Images */

.publication-image {
    width: 100px;
    height: 100px;
    object-fit: cover;
    border-radius: var(--border-radius);
    float: right;
    margin-left: 1rem;
    margin-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 1024px) {
    .navbar-container {
        padding: 0 1rem;
    }

    .hamburger {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        box-shadow: var(--box-shadow);
        padding: 1rem 0;
    }

    .nav-links.show {
        display: flex;
    }

    .nav-links li {
        margin: 0.5rem 0;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .title {
        font-size: 1.2rem;
    }

    .metrics {
        flex-direction: column;
        gap: 1rem;
    }

    .section {
        padding: 3rem 1rem;
    }

    .section h2 {
        font-size: 2rem;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-content {
        margin-left: 60px;
    }

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

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

    .news-carousel {
        overflow-x: visible;
    }

    .news-item {
        flex-direction: column;
        height: auto;
        min-height: 300px;
    }

    .news-image {
        width: 100%;
        height: 200px;
    }

    .news-content {
        width: 100%;
        padding: 1rem;
    }

    .news-item {
        min-width: auto;
    }

    .publication-image {
        float: none;
        width: 100%;
        height: auto;
        margin-left: 0;
        margin-bottom: 1rem;
    }

    .contact-form {
        padding: 1rem;
    }
}