:root {
    /* Color Palette */
    --bg-color: #F9F8F6;
    /* Warm white */
    --text-main: #3B2314;
    /* Deep chocolate brown */
    --text-muted: #7D5A3C;
    /* Warm mid-brown */
    --accent-primary: #8C6A48;
    /* Warm brown */
    --accent-secondary: #D4C5B5;
    /* Beige */
    --accent-highlight: #E8E1d9;
    /* Light beige */
    --link-color: #8C6A48;
    --border-color: #E0DAD5;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* Typography */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-body);
    line-height: 1.6;
    font-size: 1.125rem;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--text-main);
}

h1 {
    font-size: 3.5rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.25rem;
}

h3 {
    font-size: 1.5rem;
}

a {
    color: var(--link-color);
    text-decoration: none;
    transition: all 0.2s ease;
    border-bottom: 1px solid transparent;
}

a:hover {
    border-bottom-color: var(--link-color);
    opacity: 0.8;
}

/* Utilities */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: 4px;
    font-weight: 500;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary {
    background-color: var(--text-main);
    /* Dark contrast */
    color: var(--bg-color);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(45, 42, 38, 0.15);
    border-bottom: none;
    opacity: 1;
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--text-main);
    color: var(--text-main);
}

.btn-secondary:hover {
    background-color: var(--text-main);
    color: var(--bg-color);
    transform: translateY(-2px);
}

.section {
    padding: var(--spacing-xl) 0;
}

/* Header */
header {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid transparent;
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--bg-color); /* Start with solid site background */
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

body.scrolled header {
    background-color: #ffffff; /* Shift to pure white for maximum contrast */
    box-shadow: 0 10px 30px rgba(59, 35, 20, 0.1); /* Deeper, branded brown shadow */
    padding: var(--spacing-sm) 0;
    border-bottom-color: var(--border-color);
}

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

.logo {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-main);
    letter-spacing: -0.01em;
}

nav ul {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
}

nav a {
    font-size: 0.95rem;
    color: var(--text-muted);
}

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

.nav-cta {
    background: var(--accent-highlight);
    padding: 0.4rem 1rem;
    border-radius: 4px;
    color: var(--text-main) !important;
}

/* Mobile Nav */
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero */
.hero {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.hero-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    justify-content: space-between;
}

.hero-text {
    flex: 1.2;
    max-width: 650px;
}

.hero-image-container {
    flex: 0.8;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-profile-img {
    width: 350px;
    height: 350px;
    object-fit: cover;
    border-radius: 50%;
    border: 8px solid white;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.05);
    background-color: var(--accent-secondary);
}

.hero-sub {
    font-size: 1.35rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
}

@media (max-width: 992px) {
    .hero-content {
        flex-direction: column-reverse;
        text-align: center;
        gap: var(--spacing-md);
    }

    .hero-text {
        max-width: 100%;
    }

    .hero-profile-img {
        width: 250px;
        height: 250px;
    }

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

/* Cards (Generic) */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.card {
    background: #fff;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: border-color 0.2s ease;
}

.card:hover {
    border-color: var(--accent-primary);
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-sm);
}

/* Blog Post Specifics */
.article-container {
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: block;
}

.article-header {
    margin-bottom: 3rem;
    padding: 0 !important;
    border-bottom: none !important;
}

.article-back {
    margin-bottom: 3rem;
    /* A: More space below back link */
}

.article-back a {
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 500;
}

.article-back a:hover {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-highlight);
}

.article-meta {
    font-size: 0.95rem;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 1rem;
    font-weight: 500;
}

.article-title {
    font-size: clamp(2rem, 5vw, 3.25rem);
    margin-bottom: 2rem;
    /* B: More space below title */
    line-height: 1.15;
    letter-spacing: -0.01em;
}

.article-tags {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
    /* B/C: More space before TLDR */
}

.tag {
    background: var(--accent-highlight);
    padding: 0.35rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-main);
    transition: all 0.2s;
}

.tag:hover {
    background: var(--accent-secondary);
    transform: translateY(-1px);
}

.article-tldr {
    background: #fff;
    border-left: 4px solid var(--accent-primary);
    padding: 2rem;
    margin-bottom: 4rem;
    /* C: More space between TLDR and content */
    font-style: italic;
    color: var(--text-muted);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    border-radius: 0 8px 8px 0;
    line-height: 1.6;
}

.article-content {
    font-size: 1.15rem;
    line-height: 1.85;
    color: rgba(45, 42, 38, 0.95);
    margin-bottom: 4rem;
}

.article-content h3 {
    margin-top: 3rem;
    margin-bottom: 1.25rem;
    font-size: 1.75rem;
}

.article-content p {
    margin-bottom: 1.75rem;
}

.article-content ul,
.article-content ol {
    margin-bottom: 1.75rem;
    padding-left: 1.5rem;
}

.article-content li {
    margin-bottom: 0.75rem;
}

.article-divider {
    margin: 4.5rem 0 3rem;
    border: 0;
    border-top: 1px solid var(--border-color);
}

/* Share Strip */
.share-strip {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding: 1.75rem 0;
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.share-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
    color: var(--text-muted);
    white-space: nowrap;
}

.share-buttons {
    display: flex;
    gap: 0.65rem;
    flex-wrap: wrap;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    font-family: var(--font-body);
    line-height: 1;
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-bottom: none;
    opacity: 1;
}

.share-twitter {
    background: #1a1a1a;
    color: #fff;
}

.share-linkedin {
    background: #0A66C2;
    color: #fff;
}

.share-copy {
    background: var(--accent-highlight);
    color: var(--text-main);
}

.share-copy.copied {
    background: #E6F4EA;
    color: #1E4620;
}

.article-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    /* D: Ensure Grid for Nav */
    gap: 2rem;
    padding: 3rem 0;
    border-top: 1px solid var(--border-color);
}

.nav-card {
    display: flex;
    flex-direction: column;
    /* D: Ensure flex column for stacking label/title */
    padding: 1.5rem;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.2s ease;
    text-decoration: none;
    height: 100%;
}

.nav-card.empty {
    border: none;
    background: transparent;
}

.nav-card:not(.empty):hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    opacity: 1;
}

.nav-card .nav-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--accent-primary);
    font-weight: 600;
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
}

.nav-card .nav-title {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-main);
    line-height: 1.3;
}

.nav-card.next {
    text-align: right;
    align-items: flex-end;
}

/* Work Page */
.filters {
    margin-bottom: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.filter-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: all 0.2s;
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--accent-highlight);
    color: var(--text-main);
}

.project-card {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

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

.project-meta {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-xs);
    display: block;
}

.project-impact {
    font-weight: 600;
    color: var(--text-main);
    margin: var(--spacing-xs) 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.project-impact::before {
    content: "→";
    color: var(--accent-primary);
}

.details-toggle {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.9rem;
    cursor: pointer;
    margin-top: var(--spacing-sm);
    text-decoration: underline;
    padding: 0;
}

.project-details {
    display: none;
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--accent-highlight);
    border-radius: 4px;
    font-size: 0.9rem;
}

.project-details.open {
    display: block;
}

/* Credibility */
.credibility {
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--border-color);
    opacity: 0.7;
}

.cred-list {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
    font-size: 0.9rem;
    flex-wrap: wrap;
    color: var(--text-muted);
}

/* Footer */
footer {
    padding: var(--spacing-lg) 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    border-top: 1px solid var(--border-color);
}

footer .socials {
    margin: var(--spacing-sm) 0;
}

footer a {
    margin: 0 var(--spacing-xs);
}

/* Contact Form */
.form-group {
    margin-bottom: var(--spacing-sm);
}

label {
    display: block;
    margin-bottom: 0.25rem;
    font-weight: 500;
}

input,
select,
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    background: #fff;
}

textarea {
    min-height: 150px;
    resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px var(--accent-highlight);
}

/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    .article-title {
        font-size: 2.25rem;
    }

    .mobile-toggle {
        display: block;
    }

    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
        z-index: 100;
    }

    nav ul.open {
        display: flex;
    }

    /* Adjust container padding on mobile for better alignment */
    .container,
    .article-container,
    .publications-container {
        padding: 0 var(--spacing-sm);
    }
}

/* Publications Page */
/* Publications Page */
.publications-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.pub-section-title {
    margin-bottom: 2rem;
    font-size: 1.75rem;
}

.pub-grid {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-bottom: 5rem;
}

.pub-card {
    padding: 0;
    border: none;
    background: transparent;
    display: flex;
    flex-direction: column;
}

.pub-card-meta {
    font-size: 0.85rem;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
}

.pub-card-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.pub-card-title a {
    color: var(--text-main);
}

.pub-card-desc {
    margin-bottom: 1rem;
    color: var(--text-muted);
    font-size: 1rem;
    line-height: 1.5;
    flex-grow: 1;
}

.academic-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.academic-item {
    padding: 0;
    border: none;
    background: transparent;
}

/* Utility / Common */
.bg-white {
    background-color: #fff;
}

.bg-accent {
    background-color: var(--accent-highlight);
}

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

.d-flex-between-end {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}

.mb-0 {
    margin-bottom: 0 !important;
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}

.mt-sm {
    margin-top: 1rem;
}

.mr-sm {
    margin-right: 1rem;
}

.fw-500 {
    font-weight: 500;
}

.text-accent {
    color: var(--accent-primary);
}

.text-main {
    color: var(--text-main);
}

.font-sm {
    font-size: 0.8rem;
}

/* About Page */
.about-grid {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    flex-wrap: wrap;
}

.about-text {
    flex: 2;
    min-width: 300px;
}

.about-image-container {
    flex: 1;
    min-width: 250px;
}

.about-img {
    width: 100%;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.about-placeholder {
    background-color: var(--accent-secondary);
    width: 100%;
    padding-bottom: 120%;
    border-radius: 8px;
    position: relative;
    overflow: hidden;
}

.about-placeholder-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: rgba(255, 255, 255, 0.8);
    font-weight: 500;
}

/* Home Page Specifics */
.hero-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
    text-align: center;
    padding: 2rem;
}

.list-center {
    justify-content: center;
}