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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #e5e7eb;
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: #1f2937;
    line-height: 1;
}

.brand-title {
    font-size: 0.75rem;
    color: #6b7280;
    font-weight: 400;
    letter-spacing: 0.5px;
}

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

.nav-link {
    text-decoration: none;
    color: #6b7280;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: #3b82f6;
    background-color: #eff6ff;
}

/* Hero Section - Completely Redesigned */
.hero {
    display: flex;
    flex-direction: row;
    align-items: stretch;
    min-height: 80vh;
    width: 100%;
    background: linear-gradient(90deg, #23272f 60%, #181b20 100%);
}

.hero-left {
    flex: 0 0 350px;
    max-width: 400px;
    padding: 60px 40px 60px 60px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    color: #fff;
    z-index: 2;
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: 1px;
}

.hero-subtitle {
    font-size: 1.3rem;
    font-weight: 400;
    margin-bottom: 1.2rem;
    color: #3b82f6;
}

.hero-desc {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: #cbd5e1;
}

.hero-right {
    flex: 1 1 0%;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 0;
    position: relative;
    background: none;
}

#pcaCanvas, #gpCanvas {
    width: 100%;
    height: 100%;
    max-width: 900px;
    max-height: 700px;
    display: block;
    background: transparent;
}

/* Gaussian Process Container */
.gp-container {
    position: relative;
    width: 100%;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Gaussian Process Canvas */
.gp-canvas {
    position: absolute !important;
    top: 0 !important;
    left: 0 !important;
    width: 100% !important;
    height: 100% !important;
    z-index: 1 !important;
    cursor: crosshair !important;
    pointer-events: auto !important;
    background: transparent !important;
}

/* Overlay for content */
.gp-overlay {
    position: relative;
    z-index: 10;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
    text-align: center;
    color: white;
    pointer-events: auto;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 20px;
    padding: 2rem;
    backdrop-filter: blur(10px);
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-instructions {
    margin-bottom: 2rem;
    padding: 1rem;
    background: rgba(59, 130, 246, 0.2);
    border-radius: 10px;
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.hero-instructions p {
    font-size: 1rem;
    color: #ffffff;
    margin: 0;
    font-weight: 500;
}

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

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    text-decoration: none;
    font-size: 1.25rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background-color: #3b82f6;
    color: white;
}

.btn-primary:hover {
    background-color: #2563eb;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background-color: white;
    color: #3b82f6;
    transform: translateY(-2px);
}

/* Sections */
section {
    padding: 5rem 0;
}

section h2 {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
    color: #1f2937;
}

section p {
    font-size: 1.125rem;
    text-align: center;
    color: #6b7280;
    max-width: 600px;
    margin: 0 auto 3rem;
}

/* About Section */
.about {
    background-color: #f9fafb;
}

/* Expertise Section */
.expertise {
    background-color: white;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.skill-category {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e5e7eb;
}

.skill-category h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    color: #1f2937;
    text-align: center;
}

.software-logos {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.software-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem;
    background: #f8fafc;
    border-radius: 12px;
    border: 1px solid #e2e8f0;
    transition: all 0.3s ease;
    text-align: center;
}

.software-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    border-color: #3b82f6;
}

.software-logo {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #3b82f6;
    transition: transform 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.software-item:hover .software-logo {
    transform: scale(1.1);
}

.r-logo, .python-logo {
    width: 50px;
    height: 50px;
    object-fit: contain;
    transition: transform 0.3s ease;
}

.software-item:hover .r-logo,
.software-item:hover .python-logo {
    transform: scale(1.1);
}

.matlab-logo {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.software-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 1rem;
}

.libraries {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.lib-tag {
    font-size: 0.75rem;
    color: #6b7280;
    font-weight: 500;
    padding: 0.25rem 0.5rem;
    background: #e5e7eb;
    border-radius: 12px;
    white-space: nowrap;
}

/* Projects Section */
.projects {
    background-color: #f9fafb;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.project-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    border: 1px solid #e5e7eb;
    transition: all 0.3s ease;
    padding: 2rem;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1);
}

.project-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: #1f2937;
}

.project-card p {
    color: #6b7280;
    text-align: left;
    margin: 0;
}

/* Contact Section */
.contact {
    background-color: white;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-top: 3rem;
}

.contact-info h3,
.contact-form h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1f2937;
}

.contact-info p {
    color: #6b7280;
    margin-bottom: 2rem;
    text-align: left;
}

.contact-form form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-form input,
.contact-form textarea {
    padding: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.contact-form textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form button {
    background-color: #3b82f6;
    color: white;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.contact-form button:hover {
    background-color: #2563eb;
}

/* Footer */
.footer {
    background-color: #1f2937;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.footer p {
    color: #9ca3af;
    margin: 0;
}

/* Responsive Design */
@media (max-width: 900px) {
    .hero {
        flex-direction: column;
        min-height: unset;
    }
    .hero-left {
        max-width: 100%;
        padding: 40px 20px 20px 20px;
        align-items: flex-start;
    }
    .hero-right {
        min-height: 350px;
        padding: 0 0 30px 0;
    }
    #pcaCanvas, #gpCanvas {
        max-width: 100vw;
        max-height: 350px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .hero-content {
        padding: 1.5rem;
    }
    
    .hero-social {
        gap: 1rem;
    }
    
    .social-link {
        width: 45px;
        height: 45px;
        font-size: 1.1rem;
    }
    
    .software-logos {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 1rem;
    }
    
    .software-item {
        padding: 1rem;
    }
    
    .software-logo {
        font-size: 2rem;
    }
    
    .r-logo, .python-logo {
        width: 40px;
        height: 40px;
    }
    
    .matlab-logo {
        width: 35px;
        height: 35px;
    }
    
    .libraries {
        gap: 0.25rem;
    }
    
    .lib-tag {
        font-size: 0.7rem;
        padding: 0.2rem 0.4rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .skills-grid {
        grid-template-columns: 1fr;
    }
    
    section {
        padding: 3rem 0;
    }
    
    section h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .nav-container {
        padding: 0 1rem;
    }
    
    .hero-content {
        padding: 1rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .social-link {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    .software-logos {
        grid-template-columns: 1fr;
    }
    
    .r-logo, .python-logo {
        width: 35px;
        height: 35px;
    }
}

/* Bayesian Controls Styling */
.bayesian-controls input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    background: #4b5563;
    border-radius: 3px;
    outline: none;
    transition: background 0.2s ease;
}

.bayesian-controls input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #3b82f6;
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: all 0.2s ease;
}

.bayesian-controls input[type="range"]::-webkit-slider-thumb:hover {
    background: #2563eb;
    transform: scale(1.1);
}

.bayesian-controls input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #3b82f6;
    cursor: pointer;
    border: 2px solid white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: all 0.2s ease;
}

.bayesian-controls input[type="range"]::-moz-range-thumb:hover {
    background: #2563eb;
    transform: scale(1.1);
}

.bayesian-controls input[type="range"]::-moz-range-track {
    background: #4b5563;
    border-radius: 3px;
    height: 6px;
}

.bayesian-controls input[type="checkbox"] {
    accent-color: #3b82f6;
    transform: scale(1.2);
}

.bayesian-controls label {
    cursor: pointer;
    user-select: none;
}