/*
   Rob Reich Personal Website
   Color palette derived from Big Sur / Pfeiffer Beach image:
   - Sand/Cream: #f5f0e8
   - Warm Gold: #d4a554
   - Slate Gray: #5a6470
   - Deep Rock: #3d4148
   - Ocean Teal: #4a7c8c
   - Sky Peach: #e8c9a0
*/

:root {
    --color-sand: #f5f0e8;
    --color-gold: #b8860b;
    --color-gold-hover: #9a7209;
    --color-slate: #5a6470;
    --color-rock: #3d4148;
    --color-teal: #4a7c8c;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-link: #4a7c8c;
    --color-link-hover: #3d6570;
    --font-serif: 'Source Serif 4', Georgia, serif;
    --font-sans: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;
    --max-width: 720px;
}

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

html {
    font-size: 18px;
}

body {
    font-family: var(--font-serif);
    color: var(--color-text);
    background-color: #fff;
    line-height: 1.7;
}

/* Navigation */
header {
    padding: 2rem 1.5rem 1rem;
    max-width: 900px;
    margin: 0 auto;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    gap: 1rem;
}

.site-title {
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-rock);
    text-decoration: none;
}

.site-title:hover {
    color: var(--color-link);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    font-family: var(--font-sans);
    font-size: 0.95rem;
    color: var(--color-slate);
    text-decoration: none;
}

.nav-links a:hover {
    color: var(--color-link);
}

/* Main content */
main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem 3rem;
}

/* Home page */
.home .hero {
    margin: 1.5rem 0 2rem;
}

.home .hero img {
    width: 100%;
    height: auto;
    display: block;
}

.intro {
    font-size: 1.1rem;
    margin-bottom: 2.5rem;
}

.intro a {
    color: var(--color-link);
    text-decoration: none;
}

.intro a:hover {
    text-decoration: underline;
}

/* Home sections */
.home-section {
    margin-bottom: 2.5rem;
}

.home-section h2 {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--color-rock);
    margin-bottom: 0.75rem;
}

.book-list,
.affiliations {
    list-style: none;
}

.book-list li,
.affiliations li {
    margin-bottom: 0.5rem;
    padding-left: 0.75rem;
    position: relative;
}

.book-list li::before,
.affiliations li::before {
    content: "·";
    position: absolute;
    left: 0;
    color: var(--color-slate);
}

.book-list a,
.affiliations a {
    color: var(--color-link);
    text-decoration: none;
}

.book-list a:hover,
.affiliations a:hover {
    text-decoration: underline;
}

/* Page titles */
h1 {
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 400;
    color: var(--color-rock);
    margin-bottom: 1.5rem;
    margin-top: 1rem;
}

/* About page */
.about-content p {
    margin-bottom: 1.25rem;
}

.about-content a {
    color: var(--color-link);
    text-decoration: none;
}

.about-content a:hover {
    text-decoration: underline;
}

.about-photo {
    max-width: 350px;
    margin: 2rem 0;
}

.about-photo img {
    width: 100%;
    height: auto;
}

/* Publications page */
.publications-section {
    margin-bottom: 3rem;
}

.publications-section h2 {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--color-rock);
    margin-bottom: 1rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid #ddd;
}

.book-feature {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    align-items: flex-start;
}

.book-feature img {
    width: 120px;
    height: auto;
    flex-shrink: 0;
}

.book-feature .book-info h3 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.book-feature .book-info h3 a {
    color: var(--color-link);
    text-decoration: none;
}

.book-feature .book-info h3 a:hover {
    text-decoration: underline;
}

.book-feature .book-info .book-meta {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: 0.5rem;
}

.book-feature .book-info p {
    font-size: 0.95rem;
}

.pub-list {
    list-style: none;
}

.pub-list li {
    margin-bottom: 0.75rem;
    padding-left: 0.75rem;
    position: relative;
}

.pub-list li::before {
    content: "·";
    position: absolute;
    left: 0;
    color: var(--color-slate);
}

.pub-list a {
    color: var(--color-link);
    text-decoration: none;
}

.pub-list a:hover {
    text-decoration: underline;
}

.pub-list .pub-venue {
    font-style: italic;
}

/* Teaching page */
.teaching-section {
    margin-bottom: 2.5rem;
}

.teaching-section h2 {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-rock);
    margin-bottom: 0.75rem;
}

.course-list {
    list-style: none;
}

.course-list li {
    margin-bottom: 0.75rem;
    padding-left: 0.75rem;
    position: relative;
}

.course-list li::before {
    content: "·";
    position: absolute;
    left: 0;
    color: var(--color-slate);
}

.course-list .course-title {
    font-weight: 600;
}

.course-list .course-desc {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

/* Contact page */
.contact-content {
    margin-top: 1rem;
}

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

.contact-section h2 {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-slate);
    margin-bottom: 0.5rem;
}

.contact-section p {
    margin-bottom: 0.25rem;
}

.contact-section a {
    color: var(--color-link);
    text-decoration: none;
}

.contact-section a:hover {
    text-decoration: underline;
}

.email-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.email-link svg {
    width: 20px;
    height: 20px;
    fill: var(--color-link);
}

.email-link:hover svg {
    fill: var(--color-link-hover);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--color-link);
    text-decoration: none;
}

.social-links a:hover {
    text-decoration: underline;
}

.social-links svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
}

/* Abstract Tooltip */
.abstract-tooltip {
    position: fixed;
    z-index: 1000;
    max-width: 360px;
    background: #fff;
    border: 1px solid #ccc;
    border-left: 3px solid var(--color-teal);
    box-shadow: 0 4px 20px rgba(0,0,0,0.12);
    padding: 0.875rem 1rem;
    font-size: 0.9rem;
    line-height: 1.65;
    color: var(--color-text-light);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s ease;
    border-radius: 0 2px 2px 0;
}

.abstract-tooltip.visible {
    opacity: 1;
}

[data-desc] {
    cursor: help;
}

/* Footer */
footer {
    max-width: var(--max-width);
    margin: 2rem auto 0;
    padding: 2rem 1.5rem;
    border-top: 1px solid #eee;
    text-align: center;
}

footer a {
    color: inherit;
    text-decoration: none;
}

footer p {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--color-text-light);
}

/* Tab navigation */
.subtab-nav {
    display: flex;
    gap: 0;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid #ddd;
}

.subtab-btn {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    padding: 0.5rem 1.25rem;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: var(--color-slate);
    cursor: pointer;
    margin-bottom: -1px;
}

.subtab-btn:hover { color: var(--color-link); }

.subtab-btn.active {
    color: var(--color-rock);
    border-bottom-color: var(--color-teal);
    font-weight: 600;
}

.subtab-panel { display: none; }
.subtab-panel.active { display: block; }

/* Publication items in tabs */
.publication-category { margin-bottom: 2rem; }

.publication-category h3 {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-slate);
    margin-bottom: 0.75rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid #eee;
}

.publication-item {
    margin-bottom: 1.25rem;
    padding-left: 0.75rem;
    position: relative;
}

.publication-item::before {
    content: "·";
    position: absolute;
    left: 0;
    color: var(--color-slate);
}

.publication-item h4 {
    font-family: var(--font-serif);
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.15rem;
    cursor: help;
}

.publication-item h4 a {
    color: var(--color-link);
    text-decoration: none;
}

.publication-item h4 a:hover { text-decoration: underline; }

.publication-meta {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 0.25rem;
}

.publication-links {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.25rem;
}

.pub-link-btn {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    color: var(--color-link);
    text-decoration: none;
    border: 1px solid currentColor;
    padding: 0.1rem 0.4rem;
    border-radius: 2px;
}

.pub-link-btn:hover {
    background: var(--color-link);
    color: #fff;
}

/* Page sections */
.page-section { margin-bottom: 3rem; }

.page-section h2 {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--color-rock);
    margin-bottom: 1rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid #ddd;
}

/* Writing page */
.writing-list { margin-top: 1.5rem; }

.writing-item {
    margin-bottom: 1.75rem;
    padding-bottom: 1.75rem;
    border-bottom: 1px solid #eee;
}

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

.writing-item h3 {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 400;
    margin-bottom: 0.25rem;
}

.writing-item h3 a {
    color: var(--color-link);
    text-decoration: none;
}

.writing-item h3 a:hover { text-decoration: underline; }

.writing-meta {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 0.35rem;
}

.writing-excerpt { font-size: 0.95rem; }

/* Educational resources */
.resource-card {
    padding: 1rem 1.25rem;
    border-left: 3px solid var(--color-teal);
    background: #fafafa;
    margin-bottom: 1rem;
}

.resource-card h3 {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.resource-card p { font-size: 0.95rem; margin-bottom: 0.5rem; }

.resource-link {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    color: var(--color-link);
    text-decoration: none;
}

.resource-link:hover { text-decoration: underline; }

/* Course items */
.course-item { margin-bottom: 1.25rem; }

.course-item h3 {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.15rem;
    cursor: help;
}

.course-code {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: 0.2rem;
}

.course-description { font-size: 0.95rem; }
.course-links { margin-top: 0.2rem; }

.course-link {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--color-link);
    text-decoration: none;
}

.course-link:hover { text-decoration: underline; }

/* Speaking / video */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 1.5rem;
}

.video-embed {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.video-embed iframe {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    border: 0;
}

.video-info h3 {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
}

.video-meta {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--color-text-light);
}

/* Responsive */
@media (max-width: 600px) {
    html {
        font-size: 16px;
    }

    nav {
        flex-direction: column;
        align-items: flex-start;
    }

    .book-feature {
        flex-direction: column;
    }

    .book-feature img {
        width: 100px;
    }
}