/* Base Reset & Variables */
:root {
    --color-bg: #fafafa;
    --color-text: #1a1a1a;
    --color-text-muted: #555;
    --color-accent: #0d9488;
    --color-accent-dark: #0f766e;
    --color-border: #e5e5e5;
    --color-card-bg: #ffffff;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --max-width: 780px;
    --gradient-start: #0d9488;
    --gradient-mid: #2563eb;
    --gradient-end: #7c3aed;
}

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

html {
    font-size: 16px;
    line-height: 1.6;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-accent);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* Hero Section with Mesh Gradient */
.hero-wrapper {
    background: linear-gradient(135deg,
        rgba(13, 148, 136, 0.08) 0%,
        rgba(37, 99, 235, 0.06) 50%,
        rgba(124, 58, 237, 0.04) 100%);
    border-bottom: 1px solid var(--color-border);
    position: relative;
    overflow: hidden;
}

.hero-wrapper::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 60%;
    height: 200%;
    background: radial-gradient(ellipse, rgba(13, 148, 136, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.hero-wrapper::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 50%;
    height: 150%;
    background: radial-gradient(ellipse, rgba(124, 58, 237, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.hero {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 4rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 2.5rem;
    position: relative;
    z-index: 1;
}

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

.hero-photo img {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid white;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.hero-initials {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    border: 4px solid white;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: white;
    letter-spacing: -0.02em;
}

.hero-content {
    flex: 1;
}

.hero-content h1 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.hero-title {
    font-size: 1.15rem;
    color: var(--color-accent-dark);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.hero-tagline {
    color: var(--color-text-muted);
    font-size: 1.05rem;
    line-height: 1.5;
}

/* Main Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 3rem 1.5rem;
    flex: 1;
}

/* Sections */
section {
    margin-bottom: 3rem;
}

section h2 {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

section h2::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

section p {
    margin-bottom: 1rem;
}

section ul {
    margin-left: 1.25rem;
}

section li {
    margin-bottom: 0.5rem;
}

/* About */
.about p {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--color-text);
}

.about p:last-child {
    margin-bottom: 0;
}

/* Current Focus - Refined */
.focus ul {
    list-style: none;
    margin-left: 0;
    display: grid;
    gap: 0.75rem;
}

.focus li {
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: 0;
}

.focus li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 6px;
    height: 6px;
    background: var(--color-accent);
    border-radius: 50%;
}

/* Expertise Grid */
.expertise-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
}

.expertise-item {
    background: var(--color-card-bg);
    padding: 1.25rem;
    border-radius: 8px;
    border: 1px solid var(--color-border);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.expertise-item:hover {
    border-color: var(--color-accent);
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.08);
}

.expertise-item h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text);
}

.expertise-item p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 0;
    line-height: 1.5;
}

/* Work Items */
.work-item {
    margin-bottom: 1.75rem;
    padding-bottom: 1.75rem;
    border-bottom: 1px solid var(--color-border);
}

.work-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.work-item h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
    color: var(--color-text);
}

.work-item .work-role {
    font-size: 0.85rem;
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.work-item p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 0;
    line-height: 1.6;
}

.work-item a {
    color: var(--color-accent);
    text-decoration: none;
    font-weight: 500;
}

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

/* Speaking Section */
.speaking-item {
    margin-bottom: 1.5rem;
    padding-left: 1rem;
    border-left: 3px solid var(--color-accent);
}

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

.speaking-item h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.speaking-item .speaking-event {
    font-size: 0.9rem;
    color: var(--color-accent-dark);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.speaking-item .speaking-date {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* Publications */
.publication-item {
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--color-border);
}

.publication-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.publication-item h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.35rem;
    color: var(--color-text);
    line-height: 1.4;
}

.publication-item .publication-meta {
    font-size: 0.85rem;
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.publication-item .publication-authors {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 0;
    line-height: 1.4;
}

.publication-item .pub-role {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: rgba(13, 148, 136, 0.1);
    color: var(--color-accent-dark);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    margin-left: 0.5rem;
    vertical-align: middle;
}

/* Social Links */
.social-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.social-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: border-color 0.2s, color 0.2s;
}

.social-links a:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* LinkedIn CTA Button */
.about a[href*="linkedin"] {
    transition: background 0.2s, transform 0.1s;
}

.about a[href*="linkedin"]:hover {
    background: var(--color-accent-dark) !important;
    transform: translateY(-1px);
}

/* Footer */
.footer {
    border-top: 1px solid var(--color-border);
    padding: 2rem 1.5rem;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.85rem;
    background: var(--color-card-bg);
}

/* Resume Page */
.resume-page {
    max-width: 800px;
}

.resume-header {
    margin-bottom: 2rem;
}

.resume-header h1 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.resume-contact {
    color: var(--color-text-muted);
}

.resume-contact a {
    color: var(--color-accent);
    text-decoration: none;
}

.resume-section {
    margin-bottom: 2rem;
}

.job {
    margin-bottom: 2rem;
}

.job-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 0.5rem;
}

.job-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
}

.job-date {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.job-title {
    font-weight: 500;
    color: var(--color-text-muted);
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
}

.job ul {
    margin-left: 1.25rem;
}

.job li {
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

/* Skills Grid */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.skill-category h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.skill-category p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: 0;
}

/* Education */
.education-item {
    margin-bottom: 1rem;
}

.education-item h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.education-item p {
    color: var(--color-text-muted);
    margin-bottom: 0;
}

/* Blog */
.page-header {
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--color-text-muted);
}

.blog-list {
    margin-top: 2rem;
}

.coming-soon {
    color: var(--color-text-muted);
    font-style: italic;
}

.blog-preview {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--color-border);
}

.blog-preview time {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.blog-preview h2 {
    font-size: 1.25rem;
    margin: 0.5rem 0;
    border: none;
    padding: 0;
    text-transform: none;
    letter-spacing: normal;
}

.blog-preview h2 a {
    color: var(--color-text);
    text-decoration: none;
}

.blog-preview h2 a:hover {
    color: var(--color-accent);
}

/* Personal Pages */
.personal-page .page-subtitle {
    color: var(--color-text-muted);
    font-style: italic;
}

.trip-section {
    margin-bottom: 2rem;
}

.trip-section h2 {
    font-size: 1rem;
}

/* Responsive */
@media (max-width: 700px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 3rem 1.5rem;
    }

    .hero-content h1 {
        font-size: 1.85rem;
    }

    .expertise-grid,
    .skills-grid {
        grid-template-columns: 1fr;
    }

    .job-header {
        flex-direction: column;
    }

    .nav-links {
        gap: 1rem;
    }

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

    .publications-summary {
        flex-direction: column;
        align-items: flex-start;
    }
}