/* ==========================================================================
   styles.css — single source of truth for all site styling.
   Every page (index, about, publications, contact, blog) links this file.
   Edit styles here only; do not add inline <style> blocks to the pages.
   ========================================================================== */

/* --- Base -------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    line-height: 1.6;
    margin: 0;
    background: #ffffff;
    color: #111827;
}
nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: #ffffff;
    border-bottom: 1px solid #e5e7eb;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    height: 64px;
}
.nav-brand {
    font-weight: 700;
    font-size: 1rem;
    color: #111827;
    text-decoration: none;
    white-space: nowrap;
}
.nav-links { display: flex; gap: 0.25rem; }
.nav-links a {
    color: #374151;
    text-decoration: none;
    padding: 0.4rem 0.75rem;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background-color 0.15s, color 0.15s;
}
.nav-links a:hover,
.nav-links a.active { background: #f3f4f6; color: #0ea5e9; }
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2.5rem 1.5rem 4rem;
}
h2 {
    font-size: 1.375rem;
    font-weight: 700;
    color: #111827;
    margin: 0 0 1.5rem 0;
    padding-bottom: 0.4rem;
    border-bottom: 2px solid #0ea5e9;
    display: inline-block;
}
h3 { color: #1f2937; margin: 0 0 0.25rem; }
a { color: #0ea5e9; }
a:hover { text-decoration: underline; }
section { margin-bottom: 3rem; }
footer {
    background: #f9fafb;
    border-top: 1px solid #e5e7eb;
    text-align: center;
    padding: 1.5rem;
    color: #6b7280;
    font-size: 0.875rem;
    margin-top: 2rem;
}
footer p { margin: 0; }

/* --- Home (index.html) ------------------------------------------------- */
.intro {
    display: flex;
    align-items: center;
    gap: 3rem;
    padding: 3rem 0 2.5rem;
}
.intro-text { flex: 1; }
.tagline {
    color: #6b7280;
    font-size: 0.85rem;
    font-weight: 500;
    margin: 0 0 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.07em;
}
.hero-name {
    font-size: 2.25rem;
    font-weight: 700;
    color: #111827;
    margin: 0 0 1rem;
    border: none;
    display: block;
    padding: 0;
}
.hero-summary {
    color: #374151;
    font-size: 1rem;
    margin: 0 0 1.5rem;
    line-height: 1.7;
}
.headshot {
    width: 190px;
    height: 190px;
    border-radius: 50%;
    object-fit: cover;
    object-position: center 20%;
    flex-shrink: 0;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}
.cta-buttons { display: flex; gap: 0.75rem; flex-wrap: wrap; }
.cta-btn {
    display: inline-block;
    padding: 0.6rem 1.25rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.15s;
}
.cta-btn-primary { background: #0ea5e9; color: white; }
.cta-btn-primary:hover { background: #0284c7; text-decoration: none; color: white; }
.cta-btn-secondary { background: #f3f4f6; color: #374151; }
.cta-btn-secondary:hover { background: #e5e7eb; text-decoration: none; color: #111827; }
.links-section ul { list-style: none; padding: 0; }
.links-section li {
    padding: 0.875rem 0;
    border-bottom: 1px solid #f3f4f6;
    font-size: 0.95rem;
    color: #374151;
}
.links-section li:last-child { border-bottom: none; }

/* --- About (about.html) ------------------------------------------------ */
.skills-grid { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 0.5rem; }
.skill-badge {
    background: #f0f9ff;
    border-left: 3px solid #0ea5e9;
    padding: 5px 12px;
    border-radius: 4px;
    font-size: 0.875rem;
    color: #0c4a6e;
}
.timeline { display: flex; flex-direction: column; gap: 1rem; }
.timeline-item {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    transition: box-shadow 0.2s, transform 0.2s;
}
.timeline-item:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transform: translateY(-2px);
}
.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 0.75rem;
}
.timeline-date {
    font-size: 0.8rem;
    color: #6b7280;
    font-style: italic;
    white-space: nowrap;
    flex-shrink: 0;
    margin-top: 0.2rem;
}
.timeline-item h3 { font-size: 1rem; }
.dept { color: #6b7280; font-style: italic; font-size: 0.9rem; margin-top: 0.2rem; }
.timeline-item ul { margin: 0; padding-left: 1.25rem; }
.timeline-item li { margin-bottom: 0.3rem; font-size: 0.93rem; color: #374151; }
.edu-list { display: flex; flex-direction: column; gap: 1rem; }
.edu-item { display: grid; grid-template-columns: 130px 1fr; gap: 1rem; align-items: start; }
.edu-date { color: #6b7280; font-style: italic; font-size: 0.875rem; text-align: right; padding-top: 2px; }
.edu-note { font-style: italic; color: #6b7280; font-size: 0.875rem; margin-top: 0.25rem; }
.awards-list {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 16px;
}
.awards-list li {
    padding: 6px 10px;
    background: #f0f9ff;
    border-left: 3px solid #0ea5e9;
    border-radius: 4px;
    font-size: 0.875rem;
    color: #0c4a6e;
}

/* --- Contact (contact.html) -------------------------------------------- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}
.contact-item {
    background: #f0f9ff;
    border: 1px solid #e0f2fe;
    border-left: 4px solid #0ea5e9;
    padding: 1.25rem 1.5rem;
    border-radius: 8px;
}
.contact-item h3 { margin: 0 0 0.5rem; color: #0c4a6e; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.07em; }
.contact-item p { margin: 0; font-size: 0.95rem; }

/* --- Publications (publications.html) ---------------------------------- */
.pub-stats {
    background: #f0f9ff;
    color: #0c4a6e;
    border: 1px solid #bae6fd;
    text-align: center;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    font-size: 0.95rem;
    font-weight: 500;
}
.pub-list { padding-left: 1.75rem; }
.pub-list li {
    margin-bottom: 1.125rem;
    padding-bottom: 1.125rem;
    border-bottom: 1px solid #e5e7eb;
    font-size: 0.93rem;
    line-height: 1.6;
}
.pub-list li:last-child { border-bottom: none; }
.pub-note {
    color: #0ea5e9;
    font-style: italic;
    font-size: 0.875rem;
    margin-top: 4px;
}

/* --- Blog (blog.html) -------------------------------------------------- */
.blog-post {
    margin-bottom: 3rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid #e5e7eb;
}
.blog-post:last-child { border-bottom: none; }
.blog-header { margin-bottom: 1rem; }
.blog-header h2 {
    font-size: 1.5rem;
    border: none;
    padding: 0;
    display: block;
    margin-bottom: 0.25rem;
}
.blog-date { color: #6b7280; font-size: 0.875rem; }
.blog-content { margin-top: 1.25rem; color: #374151; }
.blog-content h3 { font-size: 1.05rem; margin: 1.5rem 0 0.5rem; color: #111827; }
.blog-content p { margin: 0 0 1rem; }
.tags { margin-top: 1rem; display: flex; gap: 0.5rem; flex-wrap: wrap; }
.tag {
    display: inline-block;
    background: #f0f9ff;
    border: 1px solid #bae6fd;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    color: #0c4a6e;
}
.comments-section {
    margin-top: 1.5rem;
    background: #f9fafb;
    border: 1px solid #e5e7eb;
    padding: 1.25rem 1.5rem;
    border-radius: 8px;
}
.comments-section h3 { font-size: 0.95rem; color: #374151; margin-bottom: 1rem; }
.comment {
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #e5e7eb;
}
.comment:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.comment-author { font-weight: 600; color: #111827; }
.comment-date { color: #6b7280; font-size: 0.8rem; margin-left: 0.5rem; }
.comment p { margin: 0.25rem 0 0; font-size: 0.9rem; color: #374151; }
.blog-intro { color: #6b7280; margin-top: -1rem; margin-bottom: 2rem; font-size: 0.95rem; }
blockquote {
    border-left: 3px solid #0ea5e9;
    padding-left: 1.25rem;
    margin: 1rem 0;
    color: #6b7280;
    font-style: italic;
}
code {
    background: #f3f4f6;
    padding: 2px 5px;
    border-radius: 3px;
    font-family: monospace;
    font-size: 0.9em;
}

/* --- Responsive -------------------------------------------------------- */
@media (max-width: 700px) {
    .timeline-header { flex-direction: column; gap: 0.25rem; }
    .edu-item { grid-template-columns: 1fr; }
    .edu-date { text-align: left; }
    .awards-list { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
    nav {
        height: auto;
        flex-direction: column;
        align-items: flex-start;
        padding: 0.75rem 1rem;
        gap: 0.5rem;
    }
    .nav-links { flex-wrap: wrap; gap: 0 0.1rem; }
    .container { padding: 1.5rem 1rem 3rem; }
    .intro { flex-direction: column-reverse; gap: 1.5rem; padding: 2rem 0 1.5rem; }
    .headshot { width: 140px; height: 140px; }
    .hero-name { font-size: 1.75rem; }
    .contact-grid { grid-template-columns: 1fr; }
}