/* ==========================================================================
   Jabari Myles - Academic Research Portfolio
   Clean white theme with navy and red accents
   ========================================================================== */

:root {
    --navy: #013369;
    --navy-dark: #012244;
    --navy-light: #1a4d8f;
    --red: #D50A0A;
    --red-dark: #a00808;
    --white: #FFFFFF;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);

    --transition: all 0.2s 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;
    color: var(--gray-800);
    background: var(--white);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--navy);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-link {
    display: block;
    padding: 8px 16px;
    color: var(--gray-600);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 6px;
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--navy);
    background: var(--gray-100);
}

.nav-link.active {
    color: var(--navy);
    background: var(--gray-100);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    transition: var(--transition);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
    padding: 120px 0 80px;
    background: linear-gradient(180deg, var(--gray-50) 0%, var(--white) 100%);
}

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

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 8px;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--gray-700);
    margin-bottom: 4px;
}

.hero-affiliation {
    font-size: 1.1rem;
    color: var(--red);
    font-weight: 500;
    margin-bottom: 24px;
}

.hero-description {
    font-size: 1.1rem;
    color: var(--gray-600);
    max-width: 600px;
    margin-bottom: 32px;
}

.hero-links {
    display: flex;
    gap: 16px;
}

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

.profile-placeholder {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 3rem;
    font-weight: 700;
    box-shadow: var(--shadow-lg);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: var(--navy);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--navy-dark);
}

.btn-secondary {
    background: transparent;
    color: var(--navy);
    border-color: var(--navy);
}

.btn-secondary:hover {
    background: var(--navy);
    color: var(--white);
}

/* ==========================================================================
   Sections
   ========================================================================== */

.section {
    padding: 80px 0;
}

.section-alt {
    background: var(--gray-50);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--navy);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--gray-600);
    margin-bottom: 40px;
}

/* ==========================================================================
   Research Interests
   ========================================================================== */

.interests-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-top: 40px;
}

.interest-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    padding: 32px;
    transition: var(--transition);
}

.interest-card:hover {
    border-color: var(--navy);
    box-shadow: var(--shadow-md);
}

.interest-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    background: var(--gray-100);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--navy);
}

.interest-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.interest-card p {
    color: var(--gray-600);
    font-size: 0.95rem;
}

/* ==========================================================================
   Papers Section
   ========================================================================== */

.papers-category {
    margin-bottom: 48px;
}

.papers-category:last-child {
    margin-bottom: 0;
}

.category-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--navy);
    display: inline-block;
}

.papers-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.paper-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    padding: 28px;
    transition: var(--transition);
}

.paper-card:hover {
    border-color: var(--gray-300);
    box-shadow: var(--shadow-md);
}

.paper-status {
    display: inline-block;
    padding: 4px 12px;
    background: var(--gray-100);
    color: var(--gray-600);
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 12px;
}

.paper-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.paper-authors {
    color: var(--gray-600);
    font-size: 0.95rem;
    margin-bottom: 4px;
}

.paper-venue {
    color: var(--navy);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 12px;
}

.paper-abstract {
    color: var(--gray-600);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.paper-links {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.paper-link {
    display: inline-flex;
    align-items: center;
    padding: 6px 14px;
    background: var(--gray-100);
    color: var(--navy);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    border-radius: 6px;
    transition: var(--transition);
}

.paper-link:hover {
    background: var(--navy);
    color: var(--white);
}

/* ==========================================================================
   Projects Section
   ========================================================================== */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 24px;
}

.project-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 12px;
    overflow: hidden;
    text-decoration: none;
    transition: var(--transition);
    display: block;
}

.project-card:hover {
    border-color: var(--navy);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.project-card.project-placeholder {
    pointer-events: none;
    opacity: 0.6;
}

.project-image {
    height: 160px;
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.project-card:hover .project-image {
    background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
}

.project-icon {
    color: var(--navy);
    transition: var(--transition);
}

.project-card:hover .project-icon {
    color: var(--white);
}

.project-icon.muted {
    color: var(--gray-400);
}

.project-content {
    padding: 24px;
}

.project-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.project-content p {
    color: var(--gray-600);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.project-cta {
    color: var(--red);
    font-weight: 600;
    font-size: 0.9rem;
}

.project-cta.muted {
    color: var(--gray-400);
}

/* ==========================================================================
   Contact Section
   ========================================================================== */

.contact-content {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 60px;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    color: var(--gray-600);
}

.contact-item svg {
    flex-shrink: 0;
    color: var(--navy);
    margin-top: 2px;
}

.contact-item a {
    color: var(--navy);
    text-decoration: none;
}

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

.contact-links {
    display: flex;
    gap: 16px;
}

.social-link {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--white);
    border: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-600);
    transition: var(--transition);
}

.social-link:hover {
    background: var(--navy);
    border-color: var(--navy);
    color: var(--white);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    padding: 32px 0;
    background: var(--white);
    border-top: 1px solid var(--gray-200);
    text-align: center;
}

.footer p {
    color: var(--gray-500);
    font-size: 0.9rem;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (max-width: 768px) {
    .nav-menu {
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        padding: 16px 24px;
        border-bottom: 1px solid var(--gray-200);
        display: none;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .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-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .hero-description {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-links {
        justify-content: center;
    }

    .hero-image {
        order: -1;
    }

    .profile-placeholder {
        width: 150px;
        height: 150px;
        font-size: 2.5rem;
    }

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

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

    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .contact-links {
        justify-content: flex-start;
    }
}