/* Reset & Variables */
:root {
    --primary-color: #000;
    --secondary-color: #666;
    --accent-color: #0066ff;
    --bg-color: #fff;
    --bg-alt: #f8f8f8;
    --border-color: #e0e0e0;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--primary-color);
    background-color: var(--bg-color);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

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

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--secondary-color);
    text-decoration: none;
    font-size: 0.95rem;
    transition: var(--transition);
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 6rem 0 4rem;
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -2px;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-weight: 400;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--secondary-color);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.social-links {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-top: 2rem;
}

.social-links a {
    color: var(--primary-color);
    font-size: 1.5rem;
    transition: var(--transition);
}

.social-links a:hover {
    color: var(--accent-color);
    transform: translateY(-3px);
}

/* Section Styles */
.section {
    padding: 5rem 0;
}

.section-alt {
    background-color: var(--bg-alt);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    text-align: center;
    letter-spacing: -1px;
}

/* Skills Section */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.skill-card {
    text-align: center;
    padding: 2rem;
    transition: var(--transition);
}

.skill-card:hover {
    transform: translateY(-5px);
}

.skill-card i {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.skill-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.skill-card p {
    color: var(--secondary-color);
    font-size: 0.95rem;
}

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

.project-card {
    padding: 2rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.section-alt .project-card {
    background-color: var(--bg-color);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

.project-card h3 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.project-card p {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tag {
    font-size: 0.8rem;
    padding: 0.3rem 0.8rem;
    background-color: var(--bg-alt);
    border: 1px solid var(--border-color);
    color: var(--secondary-color);
}

.section-alt .tag {
    background-color: var(--bg-color);
}

.project-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.project-link:hover {
    gap: 1rem;
}

.project-link i {
    font-size: 0.9rem;
}

.project-date {
    font-size: 0.85rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Certificates Section */
.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.certificate-card {
    text-align: center;
    padding: 2rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.certificate-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

.certificate-card i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.certificate-card h3 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.cert-date {
    font-size: 0.85rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.cert-list {
    list-style: none;
    text-align: left;
    margin: 0 auto;
    max-width: 300px;
}

.cert-list li {
    padding: 0.5rem 0;
    color: var(--secondary-color);
    position: relative;
    padding-left: 1.5rem;
}

.cert-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* Publications Section */
.publications-grid {
    display: grid;
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.publication-card {
    padding: 2rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.section-alt .publication-card {
    background-color: var(--bg-color);
}

.publication-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

.publication-date {
    font-size: 0.85rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.publication-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.publication-card p {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.publication-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.publication-link:hover {
    gap: 1rem;
}

.publication-link i {
    font-size: 0.9rem;
}

/* Blogs Section */
.blogs-grid {
    display: grid;
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.blog-card {
    padding: 2rem;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.blog-card:last-child {
    border-bottom: none;
}

.blog-card:hover {
    padding-left: 2.5rem;
}

.blog-date {
    font-size: 0.85rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.blog-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.blog-card p {
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.blog-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.blog-link:hover {
    gap: 1rem;
}

.blog-link i {
    font-size: 0.9rem;
}

/* Calendar Section */
.calendar-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.calendar-description {
    font-size: 1.1rem;
    color: var(--secondary-color);
    margin-bottom: 2rem;
}

.calendar-embed {
    padding: 2rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
}

.calendar-iframe {
    width: 100%;
    height: 800px;
    min-height: 700px;
    border: none;
    background-color: var(--bg-color);
    overflow: auto;
}

.calendar-placeholder {
    color: var(--secondary-color);
    font-size: 1rem;
}

.calendar-placeholder i {
    font-size: 3rem;
    color: var(--primary-color);
}

.calendar-placeholder small {
    font-size: 0.85rem;
}

.calendar-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background-color: var(--primary-color);
    color: var(--bg-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    border: 2px solid var(--primary-color);
    margin-top: 1rem;
}

.calendar-button:hover {
    background-color: var(--bg-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

/* Footer */
.footer {
    background-color: var(--primary-color);
    color: var(--bg-color);
    padding: 3rem 0;
    text-align: center;
}

.footer-links {
    margin-top: 1rem;
    font-size: 0.95rem;
}

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

.footer-links a:hover {
    opacity: 0.7;
}

.separator {
    margin: 0 1rem;
    opacity: 0.5;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
        font-size: 0.85rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .hero-description {
        font-size: 1rem;
    }

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

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

    .container {
        padding: 0 1.5rem;
    }

    .calendar-iframe {
        height: 700px;
        min-height: 600px;
    }
}

@media (max-width: 480px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }

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

    .section {
        padding: 3rem 0;
    }

    .calendar-iframe {
        height: 650px;
        min-height: 550px;
    }

    .calendar-embed {
        padding: 1rem;
    }
}