/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-bg: #ffffff;
    --secondary-bg: #f6f7f8;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --accent-color: #2a5880;
    --border-color: #e1e1e1;
    --spacing-unit: 1rem;
    --max-width: 1100px;
    --page-padding: 7vw;
}

body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--primary-bg);
    font-size: 16.5px;
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Header */
header {
    background-color: var(--primary-bg);
    padding: calc(var(--spacing-unit) * 5) var(--page-padding) calc(var(--spacing-unit) * 4);
    text-align: center;
    border-bottom: none;
}

header h1 {
    font-size: 2rem;
    font-weight: 300;
    letter-spacing: 0.02em;
    margin-bottom: 0.5rem;
}

.handle {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 300;
    letter-spacing: 0.08em;
}

/* Main content */
main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: calc(var(--spacing-unit) * 4) var(--page-padding) calc(var(--spacing-unit) * 5);
}

section {
    margin-bottom: calc(var(--spacing-unit) * 6);
}

section:first-child {
    margin-bottom: calc(var(--spacing-unit) * 7);
}

section h2 {
    font-size: 1.4rem;
    font-weight: 300;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: calc(var(--spacing-unit) * 2.5);
    padding-bottom: 0;
    border-bottom: none;
    color: var(--text-secondary);
}

section h3 {
    font-size: 1.25rem;
    font-weight: 500;
    letter-spacing: -0.005em;
    margin-bottom: calc(var(--spacing-unit) * 0.85);
    color: var(--text-primary);
}

section p {
    margin-bottom: calc(var(--spacing-unit) * 1.35);
    max-width: 70ch;
}

/* Links */
a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    text-decoration: underline;
}

/* About section with profile photo */
.about-content {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: calc(var(--spacing-unit) * 4.5);
    align-items: start;
}

.profile-photo {
    width: 100%;
    height: auto;
    border-radius: 0;
    box-shadow: none;
    margin-top: 0.5rem;
}

.about-text h2 {
    margin-top: 0;
}

.about-text .headline {
    font-size: 1.45rem;
    font-style: italic;
    font-weight: 300;
    line-height: 1.6;
    color: var(--text-primary);
    letter-spacing: 0.005em;
    margin-bottom: calc(var(--spacing-unit) * 1.75);
}

/* Publications section */
.publication {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: calc(var(--spacing-unit) * 4);
    align-items: start;
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.book-cover {
    width: 100%;
    height: auto;
    border-radius: 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.publication-details h3 {
    margin-top: 0;
    font-weight: 500;
}

/* Press section */
.press-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: calc(var(--spacing-unit) * 4);
}

.press-item {
    background-color: transparent;
    border-radius: 0;
    overflow: hidden;
    transition: opacity 0.3s ease;
}

.press-item:hover {
    opacity: 0.75;
    transform: none;
    box-shadow: none;
}

.press-item a {
    display: block;
    color: var(--text-primary);
}

.press-item a:hover {
    text-decoration: none;
}

.press-item img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 0;
}

.press-item h3 {
    padding: calc(var(--spacing-unit) * 1.5) 0 calc(var(--spacing-unit) * 0.65);
    margin: 0;
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: -0.005em;
}

.press-item .publication-name {
    padding: 0;
    margin: 0;
    color: var(--text-secondary);
    font-style: italic;
    font-size: 0.875rem;
}

/* Social links - organic layout */
.social-links {
    display: flex;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) * 2.5) calc(var(--spacing-unit) * 3);
    margin-top: calc(var(--spacing-unit) * 1.5);
}

.social-links a {
    display: inline-flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 0.65);
    padding: 0;
    background-color: transparent;
    border: none;
    font-weight: 400;
    font-size: 0.95rem;
    letter-spacing: 0.01em;
    transition: opacity 0.3s ease;
}

.social-links a:hover {
    opacity: 0.6;
    text-decoration: none;
}

.social-icon {
    width: 22px;
    height: 22px;
    fill: currentColor;
    opacity: 0.75;
}

/* Speaking topics - organic list */
.topics-grid {
    list-style: none;
    display: block;
}

.topics-grid li {
    padding: 0;
    background-color: transparent;
    margin-bottom: calc(var(--spacing-unit) * 3.5);
    max-width: 650px;
}

.topics-grid li:nth-child(even) {
    margin-left: auto;
}

.topics-grid h3 {
    font-size: 1.15rem;
    font-weight: 500;
    margin-bottom: 0.85rem;
    letter-spacing: -0.005em;
}

.topics-grid p {
    margin-bottom: 0.85rem;
    line-height: 1.75;
}

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

.topics-grid .venues {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-style: italic;
    line-height: 1.65;
}

/* Recent talks and general lists */
.talk-list,
.publications-list {
    line-height: 1.85;
}

.talk-list {
    list-style: none;
    margin-left: 0;
}

.talk-list li {
    margin-bottom: calc(var(--spacing-unit) * 1.15);
    padding-left: 1.5em;
    text-indent: -1.5em;
}

.talk-list li::before {
    content: "→";
    margin-right: 0.75em;
    color: var(--text-secondary);
}

.publications-list li {
    margin-bottom: calc(var(--spacing-unit) * 0.85);
}

.publications-list h3 {
    margin-top: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 1.25);
    font-size: 1.1rem;
    font-weight: 500;
}

.publications-list ul {
    margin-left: calc(var(--spacing-unit) * 1.25);
}

/* Community section */
.community-content h3 {
    margin-top: calc(var(--spacing-unit) * 2.5);
    margin-bottom: calc(var(--spacing-unit) * 1.25);
    font-size: 1.1rem;
    font-weight: 500;
}

.community-content h3:first-child {
    margin-top: 0;
}

.community-content ul {
    margin-left: calc(var(--spacing-unit) * 1.25);
    line-height: 1.85;
}

.community-content li {
    margin-bottom: calc(var(--spacing-unit) * 0.65);
}

.grants-content {
    display: block;
}

.grants-column {
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.grants-column h3 {
    margin-top: 0;
    margin-bottom: calc(var(--spacing-unit) * 1.25);
    font-size: 1.1rem;
    font-weight: 500;
}

.grants-column ul {
    margin-left: 0;
    list-style: none;
    line-height: 1.9;
    column-count: 2;
    column-gap: calc(var(--spacing-unit) * 4);
}

.grants-column li {
    margin-bottom: calc(var(--spacing-unit) * 0.65);
    break-inside: avoid;
}

.grants-column li::before {
    content: "·";
    margin-right: 0.75em;
    color: var(--text-secondary);
}

.grants-column del {
    opacity: 0.45;
    text-decoration: line-through;
}

/* Experience section */
#experience article {
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.date {
    color: var(--text-secondary);
    font-style: normal;
    font-size: 0.9rem;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    font-weight: 300;
}

/* Subsection heading within Recent Talks */
.subsection-heading {
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: -0.005em;
    text-transform: none;
    margin-top: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 1);
    color: var(--text-primary);
}

/* Accordion for talks */
.accordion-toggle {
    background: none;
    border: none;
    cursor: pointer;
    width: 100%;
    text-align: left;
    font-size: 1.4rem;
    font-weight: 300;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 0;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.subsection-toggle {
    font-size: 0.9rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    text-transform: none;
    color: var(--accent-color);
    width: auto;
    display: inline-flex;
    gap: 0.5em;
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.subsection-toggle:hover {
    opacity: 0.7;
}

.accordion-toggle:hover {
    opacity: 0.6;
}

.toggle-icon {
    font-size: 1rem;
    transition: transform 0.3s ease;
    opacity: 0.5;
}

.subsection-toggle .toggle-icon {
    font-size: 0.8rem;
}

.accordion-toggle[aria-expanded="true"] .toggle-icon {
    transform: rotate(180deg);
}

.accordion-content {
    margin-top: calc(var(--spacing-unit) * 2.5);
}

.subsection-toggle + .accordion-content {
    margin-top: 0;
}

.accordion-content[hidden] {
    display: none;
}

/* Individual talk styling */
.talk {
    padding: 0 0 calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 3);
    background-color: transparent;
    border-radius: 0;
    border: none;
    border-bottom: none;
}

.talk:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.talk h3 {
    color: var(--text-primary);
    margin-bottom: calc(var(--spacing-unit) * 0.85);
    font-weight: 500;
    font-size: 1.15rem;
}

.talk h4 {
    font-size: 0.95rem;
    font-weight: 500;
    margin-top: calc(var(--spacing-unit) * 1.5);
    margin-bottom: calc(var(--spacing-unit) * 0.85);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.talk ul {
    margin-left: calc(var(--spacing-unit) * 1.25);
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.talk li {
    margin-bottom: calc(var(--spacing-unit) * 0.7);
    line-height: 1.75;
}

.co-dev {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: calc(var(--spacing-unit) * 0.85);
    font-style: italic;
}

/* Footer */
footer {
    background-color: var(--primary-bg);
    padding: calc(var(--spacing-unit) * 4) var(--page-padding) calc(var(--spacing-unit) * 3);
    text-align: center;
    border-top: none;
    margin-top: calc(var(--spacing-unit) * 7);
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 300;
    letter-spacing: 0.05em;
}

/* Responsive design */
@media (max-width: 768px) {
    :root {
        --page-padding: 8vw;
    }

    body {
        font-size: 16px;
    }

    header {
        padding: calc(var(--spacing-unit) * 4) var(--page-padding) calc(var(--spacing-unit) * 3);
    }

    header h1 {
        font-size: 1.75rem;
    }

    section h2 {
        font-size: 1.2rem;
    }

    .social-links {
        gap: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 2);
    }

    .topics-grid li {
        max-width: 100%;
        margin-left: 0 !important;
    }

    .accordion-toggle {
        font-size: 1.4rem;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 2.5);
    }

    .profile-photo {
        max-width: 160px;
        margin: 0 auto;
    }

    .publication {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 2);
    }

    .book-cover {
        max-width: 140px;
        margin: 0 auto;
    }

    .press-grid {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 2.5);
    }

    .grants-column ul {
        column-count: 1;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }

    .handle {
        font-size: 0.9rem;
    }

    .social-links {
        flex-direction: column;
        align-items: flex-start;
        gap: calc(var(--spacing-unit) * 1.25);
    }
}