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

body {
    font-family: 'Georgia', serif;
    color: #222;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

img {
    max-width: 100%;
    height: auto;
}

/* ── HEADER ── */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    border-bottom: 1px solid #eee;
}

nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    margin: 0;
}

nav a {
    text-decoration: none;
    color: #222;
    font-size: 0.95rem;
}

.logo {
    font-weight: bold;
    font-size: 1.4rem;
    text-decoration: none;
    color: #222;
}

/* ── FOOTER ── */
footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
    border-top: 1px solid #eee;
    color: #999;
    font-size: 0.85rem;
}

/* ── HERO ── */
.hero {
    text-align: center;
    padding: 5rem 0;
}

.hero h1 {
    font-size: 3rem;
    margin: 1rem 0 0.5rem;
}

.hero p {
    font-size: 1.2rem;
    color: #666;
}

.hero img {
    width: 200px;
}

/* ── CONTACT PAGE ── */
.page {
    padding: 3rem 0;
    max-width: 700px;
    margin: 4rem auto;
}

.page h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    border-bottom: 2px solid #222;
    padding-bottom: 0.5rem;
}

.page h2 {
    font-size: 1.3rem;
    margin: 2rem 0 0.5rem;
}

.page p {
    line-height: 1.7;
    margin-bottom: 1rem;
    color: #444;
}

.page a {
    color: #0066cc;
    text-decoration: none;
}

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

.contact-card {
    background: #f9f9f9;
    border-left: 4px solid #4a6fa5;
    padding: 1.5rem 2rem;
    margin: 2rem 0;
    line-height: 2;
}

.contact-map {
    margin: 2rem auto 0;
    margin-top: 2rem;
    border: 2px solid #111;
    width: 100%;
    overflow: hidden;
    max-width: 400px;
}

.contact-map iframe {
    display: block;
    width: 100%;
    height: 300px;
}

/* ── PEOPLE PAGE ── */
.people-role {
    font-size: 1.4rem;
    margin: 3rem 0 1rem;
    border-bottom: 2px solid #222;
    padding-bottom: 0.3rem;
}

.people-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 2rem;
    margin-top: 1.5rem;
}

.person-card {
    text-align: center;
}

.person-card img {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 0.8rem;
    border: 3px solid #eee;
}

.person-card h3 {
    font-size: 1rem;
    margin-bottom: 0.4rem;
}

.person-now {
    font-size: 0.85rem;
    color: #888;
    margin: 0.3rem 0;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 0.8rem;
    flex-wrap: nowrap;
    white-space: nowrap;
}

.social-links a {
    font-size: 1.3rem;
    color: #888;
    text-decoration: none;
    border: none;
    padding: 0.2rem;
}

.social-links a:hover {
    color: #ffffff;
    background: #0066aa;
}

.alumni-list {
    list-style: none;
    margin-top: 1rem;
}

.alumni-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #eee;
    color: #444;
}

/* ── RESEARCH PAGE ── */
.research {
    max-width: 900px;
    margin: 4rem auto;
    padding: 0 1rem;
}

.research h1 {
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: -2px;
    margin-bottom: 0.2rem;
    color: #111;
}

.research h2 {
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: -1px;
    margin: 4rem 0 1.5rem;
    color: #111;
    border-left: 6px solid #111;
    padding-left: 1rem;
}

.research p {
    line-height: 1.8;
    color: #555;
    margin-bottom: 1rem;
    font-size: 1.05rem;
    text-align: justify;
}

.research-overview {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 2rem 0 3rem;
}

.overview-card {
    background: #f5f5f5;
    border-top: 4px solid #111;
    padding: 2rem;
}

.overview-card h3 {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    color: #888;
}

.overview-card ul {
    list-style: none;
    padding: 0;
}

.overview-card ul li {
    padding: 0.6rem 0;
    border-bottom: 1px solid #ddd;
    color: #333;
    font-size: 1rem;
}

.overview-card ul li:last-child {
    border-bottom: none;
}

.project-card {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 2rem;
    align-items: center;
    margin: 2rem 0;
    padding: 2rem;
    border: 2px solid #111;
}

.project-card:hover {
    background: #0066aa;
    transition: background 0.2s ease;
}

.project-card:hover .project-info h3,
.project-card:hover .project-info p {
    color: #fff;
    transition: color 0.2s ease;
}

.project-info h3 {
    font-size: 1.8rem;
    font-weight: 900;
    letter-spacing: -1px;
    margin-bottom: 0.8rem;
    color: #111;
}

.project-info p {
    line-height: 1.8;
    color: #555;
    text-align: justify;
}

.project-img {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 300px;
    overflow: hidden;
}

.project-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: none;
}

/* ── ROBOTS PAGE ── */
.robots {
    max-width: 900px;
    margin: 4rem auto;
    padding: 0 1rem;
}

.robots h1 {
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: -2px;
    margin-bottom: 2rem;
    color: #111;
}

.robot-card {
    margin: 3rem 0;
    border: 2px solid #111;
}

.robot-header {
    background: #111;
    color: white;
    padding: 1.5rem 2rem;
}

.robot-header h2 {
    font-size: 2rem;
    font-weight: 900;
    letter-spacing: -1px;
    margin-bottom: 0.2rem;
}

.robot-subtitle {
    font-size: 0.85rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: #aaa;
}

.robot-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    padding: 2rem;
}

.robot-img {
    height: 300px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.robot-img img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.robot-info p {
    line-height: 1.8;
    color: #444;
    margin-bottom: 1.5rem;
    text-align: justify;
}

.robot-links {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.robot-btn {
    display: block;
    padding: 0.7rem 1rem;
    border: 2px solid #111;
    color: #111;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    text-align: center;
    transition: all 0.2s ease;
}

.robot-btn:hover {
    background: #0066aa;
    color: white;
}

/* ── BOOKS PAGE ── */
.books {
    max-width: 900px;
    margin: 4rem auto;
    padding: 0 1rem;
}

.books h1 {
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: -2px;
    margin-bottom: 2rem;
    color: #111;
}

.book-card {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 3rem;
    margin: 3rem 0;
    padding-bottom: 3rem;
    border-bottom: 2px solid #111;
}

.book-card:last-child {
    border-bottom: none;
}

.book-cover img {
    width: 100%;
    box-shadow: 4px 4px 20px rgba(0,0,0,0.2);
}

.book-info h2 {
    font-size: 1.6rem;
    font-weight: 900;
    letter-spacing: -0.5px;
    margin-bottom: 0.3rem;
    color: #111;
}

.book-subtitle {
    font-size: 1rem;
    color: #555;
    font-style: italic;
    margin-bottom: 0.5rem;
}

.book-meta {
    font-size: 0.85rem;
    color: #888;
    margin-bottom: 0.2rem;
}

.book-isbn {
    font-size: 0.8rem;
    color: #aaa;
    margin-bottom: 1rem;
    font-family: monospace;
}

.book-description {
    line-height: 1.8;
    color: #444;
    margin-bottom: 1.5rem;
    text-align: justify;
}

.book-links {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.book-btn {
    padding: 0.6rem 1.2rem;
    border: 2px solid #111;
    color: #111;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.2s ease;
}

.book-btn:hover {
    background: #111;
    color: white;
}

.toc {
    margin-top: 1rem;
    border-top: 1px solid #eee;
    padding-top: 1rem;
}

.toc summary {
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    cursor: pointer;
    color: #888;
    margin-bottom: 1rem;
}

.toc summary:hover {
    color: #111;
}

.toc ol {
    padding-left: 1.5rem;
    color: #444;
    line-height: 2;
    font-size: 0.95rem;
}

/* ── PRESENTATIONS PAGE ── */
.presentations {
    max-width: 800px;
    margin: 4rem auto;
    padding: 0 1rem;
}

.presentations h1 {
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: -2px;
    margin-bottom: 2rem;
    color: #111;
}

.presentations h2 {
    font-size: 1rem;
    font-weight: 900;
    letter-spacing: 4px;
    text-transform: uppercase;
    margin: 3rem 0 0;
    padding: 0.5rem 1rem;
    background: #111;
    color: white;
    display: inline-block;
}

.presentations ul {
    list-style: none;
    padding: 0;
    border: 2px solid #111;
    margin-bottom: 2rem;
}

.presentations ul li {
    padding: 1.2rem 1.5rem;
    border-bottom: 1px solid #eee;
    line-height: 1.6;
    color: #444;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    transition: background 0.2s ease, color 0.2s ease;
}

.presentations ul li:last-child {
    border-bottom: none;
}

.presentations ul li:hover {
    background: #0066aa;
    color: white;
}

.presentations ul li:hover strong,
.presentations ul li:hover a,
.presentations ul li:hover .tag.invited,
.presentations ul li:hover .tag.contributed {
    color: white;
    border-color: white;
}

.presentations ul li strong {
    color: #111;
    font-size: 0.8rem;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.presentations a {
    color: #111;
    text-decoration: none;
    font-size: 1.05rem;
    font-weight: 600;
}

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

.tag {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    padding: 0.15rem 0.5rem;
    border-radius: 2px;
    vertical-align: middle;
}

.tag.invited {
    font-style: italic;
    color: #888;
}

.tag.contributed {
    background: white;
    color: #111;
    border: 1px solid #111;
}