/* 
* Josef Berman - Data scientist portfolio
* Warm light theme: editorial type, mesh hero, terracotta + teal accents
*/

:root {
    --primary: #c2410c;
    --primary-dark: #9a3412;
    --primary-light: #ea580c;
    --accent-teal: #0f766e;
    --accent-teal-soft: #ccfbf1;
    --secondary: #57534e;
    --secondary-dark: #44403c;
    --secondary-light: #78716c;
    --bg-page: #faf8f5;
    --bg-dark: #faf8f5;
    --bg-darker: #f5f0e8;
    --bg-light: #ffffff;
    --bg-muted: #f3eee6;
    --bg-elevated: #ffffff;
    --text-primary: #1c1917;
    --text-secondary: #57534e;
    --text-light: #44403c;
    --border-color: rgba(28, 25, 23, 0.08);
    --border-strong: rgba(28, 25, 23, 0.14);
    --success: #15803d;
    --error: #dc2626;
    --footer-ink: #1c1917;

    --font-heading: 'Fraunces', 'Georgia', serif;
    --font-body: 'Outfit', system-ui, sans-serif;

    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-xxl: 5rem;

    --border-radius: 12px;
    --border-radius-lg: 20px;
    --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 1px 2px rgba(28, 25, 23, 0.06);
    --shadow: 0 4px 24px rgba(28, 25, 23, 0.08);
    --shadow-hover: 0 12px 40px rgba(194, 65, 12, 0.12);
    --container-width: 1140px;
    --grid-gap: 1.75rem;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    line-height: 1.65;
    color: var(--text-primary);
    background-color: var(--bg-page);
    transition: var(--transition);
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    line-height: 1.2;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
    font-weight: 600;
    letter-spacing: -0.03em;
    font-optical-sizing: auto;
}

h1 {
    font-size: 3.2rem;
    margin-bottom: var(--space-lg);
    line-height: 1.2;
    letter-spacing: 0;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 1.75rem;
}

p {
    margin-bottom: var(--space-md);
    font-size: 1rem;
    color: var(--text-secondary);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: var(--border-radius);
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.section {
    padding: var(--space-xxl) 0;
    position: relative;
}

.section-title {
    font-family: var(--font-body);
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 0.14em;
    color: var(--primary);
    margin-bottom: var(--space-sm);
    font-weight: 600;
}

.section-eyebrow {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--primary);
    margin-bottom: var(--space-sm);
}

.section-subtitle {
    font-family: var(--font-heading);
    font-size: clamp(1.75rem, 4vw, 2.35rem);
    font-weight: 600;
    margin-bottom: var(--space-md);
    max-width: 42rem;
    line-height: 1.2;
    letter-spacing: -0.03em;
    color: var(--text-primary);
}

.section-lead {
    font-family: var(--font-body);
    font-size: 1.0625rem;
    color: var(--text-secondary);
    max-width: 40rem;
    margin-bottom: var(--space-xl);
    line-height: 1.65;
}

.section-subtitle-accent {
    color: var(--primary-light);
}

#about .section-subtitle.section-subtitle-accent,
#projects .section-subtitle.section-subtitle-accent,
#contact .section-subtitle.section-subtitle-accent {
    margin-bottom: var(--space-xl);
}

.section-muted {
    background-color: var(--bg-muted);
    background-image: radial-gradient(ellipse 120% 80% at 100% 0%, rgba(194, 65, 12, 0.06) 0%, transparent 50%);
}

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

.section-dots {
    background-color: var(--bg-light);
    background-image: radial-gradient(rgba(28, 25, 23, 0.055) 1px, transparent 1px);
    background-size: 22px 22px;
}

.section-contact {
    background: linear-gradient(165deg, var(--accent-teal-soft) 0%, #faf8f5 45%, #fff7ed 100%);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.text-gradient {
    background: linear-gradient(120deg, var(--primary) 0%, #ea580c 40%, var(--accent-teal) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero-title-accent {
    color: var(--primary-light);
}

.tech-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: var(--space-md);
}

.tech-pills.about-tech {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.tech-pills-group {
    display: grid;
    grid-template-columns: minmax(5.5rem, 8.25rem) 1fr;
    gap: 0.5rem 1rem;
    align-items: start;
}

@media screen and (max-width: 520px) {
    .tech-pills-group {
        grid-template-columns: 1fr;
        gap: 0.35rem;
    }
}

.tech-pills-group-label {
    font-family: var(--font-body);
    font-size: 0.6875rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-secondary);
    line-height: 1.4;
    padding-top: 0.28rem;
}

.tech-pills-group-items {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-pills-group-items span {
    font-family: var(--font-body);
    font-size: 0.8125rem;
    font-weight: 500;
    padding: 0.35rem 0.75rem;
    border-radius: 999px;
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.tech-pills-group-items span:hover {
    border-color: rgba(194, 65, 12, 0.35);
    color: var(--primary);
    transform: translateY(-1px);
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: 0.65rem 1.35rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: background-color var(--transition), border-color var(--transition), color var(--transition), transform 0.15s ease;
    border: 1px solid transparent;
    font-family: var(--font-body);
    text-transform: none;
    letter-spacing: 0;
    font-size: 0.9375rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 2px 12px rgba(194, 65, 12, 0.35);
}

.btn-primary:hover {
    filter: brightness(1.05);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(194, 65, 12, 0.4);
}

.btn-secondary {
    background-color: var(--bg-light);
    border: 1px solid var(--border-strong);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background-color: #fff;
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

/* ===== HEADER & NAVIGATION ===== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(250, 248, 245, 0.78);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
    backdrop-filter: blur(14px) saturate(1.2);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) 0;
}

.logo a {
    font-family: var(--font-body);
    font-size: clamp(1.2rem, 0.35vw + 1.1rem, 1.4rem);
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.logo a > span:first-of-type {
    display: block;
}

.logo .logo-sub {
    display: block;
    font-size: 0.6875rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    margin-top: 0.2rem;
}

.nav-links {
    display: flex;
    align-items: center;
}

.nav-links li {
    margin-left: var(--space-lg);
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    font-size: 0.875rem;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--primary);
    transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-primary);
}

/* ===== HERO SECTION ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
    background-color: var(--bg-page);
}

.hero-media {
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.hero-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
}

.hero-media__scrim {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        115deg,
        rgba(250, 248, 245, 0.94) 0%,
        rgba(250, 248, 245, 0.82) 38%,
        rgba(250, 248, 245, 0.45) 62%,
        rgba(250, 248, 245, 0.25) 100%
    );
    pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
    .hero-canvas {
        display: none;
    }

    .hero-media {
        background:
            radial-gradient(ellipse 100% 80% at 70% 40%, rgba(204, 251, 241, 0.5) 0%, transparent 55%),
            radial-gradient(ellipse 80% 60% at 20% 70%, rgba(253, 186, 116, 0.35) 0%, transparent 50%),
            var(--bg-page);
    }

    .hero-media__scrim {
        background: rgba(250, 248, 245, 0.88);
    }
}

.hero-layout {
    position: relative;
    z-index: 2;
    width: 100%;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: 38rem;
    z-index: 1;
    position: relative;
}

.hero-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: var(--space-lg);
}

.hero-pill {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0.4rem 0.85rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.72);
    border: 1px solid rgba(28, 25, 23, 0.08);
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(8px);
}

.hero-content h1 {
    font-size: clamp(2.35rem, 5.5vw, 3.5rem);
    margin-bottom: var(--space-lg);
    line-height: 1.08;
    font-weight: 700;
    max-width: min(100%, 34rem);
    text-wrap: balance;
}

.hero-content p {
    font-size: 1.0625rem;
    margin-bottom: var(--space-xl);
    color: var(--text-secondary);
    max-width: 32rem;
    line-height: 1.7;
}

.hero-btns {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.hero-btns .btn {
    margin-right: 0;
    margin-bottom: 0;
}

/* ===== PROJECTS GRID ===== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--grid-gap);
}

.project-card {
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: border-color var(--transition), transform 0.25s ease, box-shadow 0.25s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-6px);
    border-color: rgba(194, 65, 12, 0.2);
    box-shadow: var(--shadow-hover);
}

.project-image {
    height: 240px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

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

.project-content {
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.project-content h3 {
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
    font-size: 1.5rem;
}

.project-subheader {
    font-size: 0.875rem;
    font-weight: 600;
    font-style: normal;
    color: var(--accent-teal);
    margin-bottom: var(--space-sm);
    letter-spacing: 0;
}

.project-content p {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
    flex-grow: 1;
}

.project-links {
    display: flex;
    gap: var(--space-md);
    margin-top: auto;
}

.project-links a {
    font-size: 0.8125rem;
    font-weight: 500;
    padding: 0.4rem 0.85rem;
    border-radius: 6px;
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    transition: var(--transition);
}

.project-links a:hover {
    background-color: rgba(194, 65, 12, 0.08);
    border-color: var(--primary);
    color: var(--primary);
}

.project-links a i {
    margin-right: var(--space-xs);
}

/* ===== ABOUT SECTION ===== */
.about-content {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: var(--grid-gap);
    align-items: start;
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
}

.about-text {
    max-width: 800px;
}

.about-text p {
    margin-bottom: var(--space-lg);
}

/* ===== PUBLICATIONS SECTION ===== */
.publications-list {
    display: flex;
    flex-direction: column;
    gap: var(--grid-gap);
}

.publication-item {
    display: grid;
    grid-template-columns: 80px 1fr;
    gap: var(--space-lg);
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    padding: var(--space-lg);
    border-radius: var(--border-radius);
    box-shadow: none;
    transition: var(--transition);
}

.publication-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.publication-meta {
    text-align: center;
}

.publication-year {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary);
}

.publication-content h3 {
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.publication-authors {
    margin-bottom: var(--space-xs);
    font-style: italic;
    color: var(--text-secondary);
}

.publication-journal {
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

.publication-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    align-items: center;
    margin-top: var(--space-md);
}

.publication-links a {
    font-size: 0.9rem;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    background-color: var(--bg-muted);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.publication-links a:hover {
    background-color: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.publication-links a i {
    margin-right: var(--space-xs);
}

.doi {
    font-family: monospace;
    color: var(--text-secondary);
    font-size: 0.9rem;
    display: block;
    margin-top: var(--space-xs);
}

/* Standalone article pages use .blog-content for prose */
.blog-content {
    line-height: 1.75;
}

.blog-content h3 {
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.blog-content p {
    color: var(--text-secondary);
    margin-bottom: var(--space-lg);
}

/* ===== CONTACT SECTION ===== */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--grid-gap);
}

.contact-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-xl);
    padding: var(--space-lg) 0;
}

.contact-item {
    margin-bottom: 0;
    display: inline-block;
}

.contact-item a {
    font-size: 2.5rem;
    color: var(--text-primary);
    transition: var(--transition);
    display: block;
}

.contact-item a:hover {
    color: var(--primary);
    transform: translateY(-5px);
}

.contact-form {
    background-color: rgba(255, 255, 255, 0.85);
    padding: var(--space-xl);
    border-radius: var(--border-radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.9);
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

.contact-form p {
    margin-bottom: var(--space-lg);
}

/* ===== FOOTER ===== */
footer {
    background-color: var(--footer-ink);
    color: #a8a29e;
    padding: var(--space-xl) 0 var(--space-lg);
    border-top: none;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
}

.footer-social {
    display: flex;
    gap: var(--space-md);
}

.footer-social a {
    font-size: 1.5rem;
    color: #d6d3d1;
    transition: var(--transition);
}

.footer-social a:hover {
    color: #fed7aa;
    transform: translateY(-3px);
}

.footer-license {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--space-md);
    font-size: 0.8125rem;
    color: #78716c;
}

.footer-license a {
    color: #fdba74;
}

/* ===== ANIMATION EFFECTS ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Mobile menu styles for responsive design */
@media screen and (max-width: 768px) {
    /* .nav-links {
        display: none;
    } */
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: var(--bg-light);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        padding: 2rem 0;
        transform: translateY(-150%);
        transition: transform 0.4s ease-in-out;
        box-shadow: var(--shadow);
        z-index: 999;
    }

    .nav-links.active {
        transform: translateY(0);
    }

    .nav-links li {
        margin: 1rem 0;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .contact-info {
        justify-content: center;
        margin-bottom: var(--space-lg);
        padding: var(--space-md) 0;
        gap: var(--space-lg);
    }
    
    .contact-item a {
        font-size: 2rem;
    }
    
    .logo a {
        font-size: 1.35rem;
    }
    
    .about-content {
        display: flex;
        flex-direction: column;
        align-items: center;
        text-align: center;
        padding: 0;
    }
    
    .about-image {
        width: 280px;
        height: 280px;
        margin-bottom: var(--space-lg);
    }
    
    .about-image img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        border-radius: var(--border-radius);
    }
    
    .about-text {
        width: 100%;
        padding: 0;
    }
    
    .about-text p {
        margin-bottom: var(--space-md);
        text-align: left;
    }

    .tech-pills.about-tech {
        align-items: center;
    }

    .tech-pills.about-tech .tech-pills-group {
        grid-template-columns: 1fr;
        justify-items: center;
        text-align: center;
    }

    .tech-pills.about-tech .tech-pills-group-label {
        text-align: center;
        padding-top: 0;
    }

    .tech-pills.about-tech .tech-pills-group-items {
        justify-content: center;
    }
    
    .hero-btns {
        flex-direction: column;
        align-items: center;
        width: 100%;
    }
    
    .hero-btns .btn {
        width: 100%;
        max-width: 250px;
        margin-bottom: var(--space-sm);
    }
}

header.scrolled {
    background-color: rgba(255, 255, 255, 0.92);
    border-bottom-color: var(--border-strong);
    box-shadow: var(--shadow-sm);
}

.footer-content p {
    color: #d6d3d1;
}

/* ===== RESPONSIVE DESIGN ===== */
@media screen and (max-width: 1024px) {
    :root {
        --grid-gap: 1.5rem;
    }
    
    .hero-content h1 {
        font-size: 3rem;
    }
    
    .section-subtitle {
        font-size: 2.25rem;
    }
}

@media screen and (max-width: 768px) {
    /* .nav-links {
        display: none;
    } */
    .mobile-menu-btn {
        display: block;
    }
    
    .hero {
        min-height: auto;
        padding: 120px 0 var(--space-xl);
    }
    
    .hero-layout {
        flex-direction: column;
        justify-content: center;
    }
    
    .hero-content {
        padding-right: 0;
        margin-bottom: var(--space-xl);
        text-align: center;
    }

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

    .hero-content h1 {
        max-width: none;
        margin-left: auto;
        margin-right: auto;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-content p {
        margin: 0 auto var(--space-lg);
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        margin: 0 auto var(--space-xl);
        max-width: 350px;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        justify-content: center;
        margin-bottom: var(--space-lg);
    }
    
    .contact-item a {
        font-size: 2rem;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
    
    .publication-item {
        grid-template-columns: 1fr;
    }
    
    .publication-meta {
        margin-bottom: var(--space-md);
        text-align: left;
    }
}

@media screen and (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    :root {
        --grid-gap: 1rem;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .section {
        padding: var(--space-xl) 0;
    }
}