/* CSS Variables */
:root {
    /* Colors */
    --bg-color: #FAF9F5;
    --text-main: #141413;
    --text-secondary: #4A4A48;
    --text-muted: #6B6B67;
    --border-color: #D1CFCD;
    --accent-color: #D25E45;
    --highlight-bg: #EAE8E4;
    --nav-bg: rgba(250, 249, 245, 0.95);

    /* Tighter Spacing */
    --spacing-xs: 0.35rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1.25rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Fonts */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-serif: 'Crimson Pro', serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(15px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.03); }
}

@keyframes typing {
    from { width: 0; }
    to { width: 100%; }
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-serif);
    font-size: 1.05rem;
    line-height: 1.55;
    padding-bottom: var(--spacing-xl);
    overflow-x: hidden;
}

.container {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Typography */
h1 {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 2.4rem;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
    color: var(--text-main);
}

h2 {
    font-family: var(--font-sans);
    font-weight: 500;
    font-size: 1.3rem;
    margin: var(--spacing-lg) 0 var(--spacing-sm) 0;
    border-top: 1px solid var(--border-color);
    padding-top: var(--spacing-sm);
    letter-spacing: -0.01em;
}

h3 {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

p {
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

a {
    color: var(--text-main);
    text-decoration: none;
    border-bottom: 1px solid rgba(20, 20, 19, 0.25);
    transition: all 0.2s ease;
}

a:hover {
    border-bottom-color: var(--accent-color);
    color: var(--accent-color);
}

a.no-border {
    border-bottom: none;
}

/* Navigation */
.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(8px);
    z-index: 100;
    margin-bottom: var(--spacing-lg);
}

.nav-logo {
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 0.02em;
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    font-family: var(--font-sans);
    font-size: 0.9rem;
}

/* Hero Section */
.hero {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    animation: fadeIn 0.6s ease-out;
}

@media (min-width: 700px) {
    .hero {
        grid-template-columns: 1.6fr 1fr;
        align-items: start;
    }
}

.hero-content {
    padding-right: var(--spacing-sm);
}

/* Dynamic Title */
.dynamic-title {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin-bottom: var(--spacing-md);
}

.greeting {
    font-size: 2.1rem;
    font-weight: 600;
    line-height: 1.2;
}

.tagline {
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--text-secondary);
    line-height: 1.35;
}

.tagline em {
    font-style: normal;
    color: var(--accent-color);
    font-weight: 500;
}

/* Bio */
.bio {
    margin-top: 0;
}

.bio p {
    font-size: 1.05rem;
    line-height: 1.65;
    margin-bottom: 0.75rem;
}

/* Meta Lines (Affiliations + Links) */
.meta-lines {
    margin-top: 0.5rem;
}

.meta-lines p {
    font-family: var(--font-serif);
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 0.2rem;
    line-height: 1.5;
}

.meta-lines p a {
    color: var(--text-main);
}

.meta-lines p.links {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    margin-top: 0.4rem;
    color: var(--text-muted);
}

.meta-lines p.links a {
    color: var(--text-secondary);
}

/* Profile Image with Tooltip */
.hero-profile {
    display: flex;
    justify-content: center;
    animation: slideInRight 0.8s ease-out;
}

@media (min-width: 700px) {
    .hero-profile {
        justify-content: flex-end;
    }
}

.profile-img-container {
    width: 100%;
    max-width: 200px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 10px 10px 0px rgba(0, 0, 0, 0.04);
    transition: transform 0.3s ease;
    position: relative;
    cursor: pointer;
}

.profile-img-container:hover {
    transform: translateY(-3px);
}

/* Tooltip */
.profile-img-container::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(20, 20, 19, 0.85);
    color: #fff;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    padding: 0.5rem 0.75rem;
    text-align: center;
    opacity: 0;
    transform: translateY(100%);
    transition: all 0.3s ease;
}

.profile-img-container:hover::after {
    opacity: 1;
    transform: translateY(0);
}

.profile-img {
    width: 100%;
    display: block;
    height: auto;
}

.phd-badge {
    display: inline-block;
    background: var(--text-main);
    color: #fff;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 15px;
    margin-bottom: var(--spacing-sm);
    animation: pulse 3s infinite;
}

/* Research Section */
.research-category {
    margin-bottom: var(--spacing-lg);
    padding-left: 1rem;
    border-left: 3px solid var(--border-color);
    position: relative;
}

.category-title {
    font-family: var(--font-sans);
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
    display: block;
}

.research-item {
    margin-bottom: var(--spacing-sm);
    /* padding-bottom: var(--spacing-sm); */
}

.research-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
}

.research-title {
    font-family: var(--font-sans);
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
    line-height: 1.3;
}

.research-meta {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.3rem;
}

.research-item p {
    font-size: 0.95rem;
    margin-bottom: 0.4rem;
}

.tldr {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background: #F0EFE9;
    padding: 5px 8px;
    border-radius: 3px;
    color: var(--text-secondary);
    margin-top: 0.4rem;
    display: inline-block;
}

.label-featured {
    display: inline-block;
    color: var(--accent-color);
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.15rem;
}

/* Subprojects */
.subprojects {
    margin-top: 0.5rem;
    padding-left: 0.25rem;
}

.subproject {
    display: flex;
    align-items: flex-start;
    gap: 0.4rem;
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.subproject-bullet {
    width: 5px;
    height: 5px;
    background: var(--accent-color);
    border-radius: 50%;
    flex-shrink: 0;
    margin-top: 0.45rem;
}

/* Experience Grid */
.exp-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.exp-item {
    display: grid;
    grid-template-columns: 40px 1fr;
    gap: var(--spacing-sm);
    align-items: start;
}

.exp-logo {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border-radius: 6px;
    overflow: hidden;
}

.exp-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.exp-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.exp-content h4 {
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 600;
    margin: 0;
}

.exp-date {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.exp-role {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 0.9rem;
    margin-top: 0.1rem;
    color: var(--text-secondary);
}

.exp-details {
    padding-left: 1rem;
    margin-top: 0.25rem;
    font-size: 0.85rem;
}

.exp-details li {
    margin-bottom: 0.15rem;
    color: var(--text-secondary);
}

/* Education Grid */
.edu-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.edu-item {
    display: grid;
    grid-template-columns: 40px 1fr;
    gap: var(--spacing-sm);
    align-items: center;
}

.edu-logo {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border-radius: 6px;
    overflow: hidden;
}

.edu-logo img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.edu-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.edu-school {
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 0.95rem;
}

.edu-period {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.edu-degree {
    font-style: italic;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.05rem;
}

/* Compact List (Teaching) */
.compact-list {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.compact-item {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 0.4rem;
    padding: 0.3rem 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.compact-item:last-child {
    border-bottom: none;
}

.compact-title {
    font-family: var(--font-sans);
    font-weight: 500;
    font-size: 0.9rem;
}

.compact-meta {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Footer */
footer {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-color);
    font-family: var(--font-sans);
    font-size: 0.75rem;
    color: var(--text-muted);
}

footer .vibe-credit {
    margin-top: 0.25rem;
    font-size: 0.7rem;
    opacity: 0.7;
}

footer .vibe-credit a {
    color: var(--text-muted);
}

/* Mobile Adjustments */
@media (max-width: 699px) {
    h1 {
        font-size: 1.6rem;
    }

    .greeting {
        font-size: 1.6rem;
    }

    .tagline {
        font-size: 1.1rem;
    }

    .hero-profile {
        order: -1;
        margin-bottom: var(--spacing-sm);
    }

    .profile-img-container {
        max-width: 120px;
    }

    .nav-links {
        gap: var(--spacing-xs);
        font-size: 0.8rem;
    }

    .exp-item,
    .edu-item {
        grid-template-columns: 36px 1fr;
    }

    .exp-logo,
    .edu-logo {
        width: 36px;
        height: 36px;
    }
}