/* ============ Reset & Base ============ */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', 'Noto Sans SC', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.7;
    color: #2c3e50;
    background: #fafbfc;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: #2563eb; text-decoration: none; transition: color 0.2s; }
a:hover { color: #1d4ed8; text-decoration: underline; }

.container {
    max-width: 880px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ============ Header / Nav ============ */
.site-header {
    background: #fff;
    border-bottom: 1px solid #e5e7eb;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    background: rgba(255,255,255,0.92);
}
.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 0.9rem;
    padding-bottom: 0.9rem;
    gap: 1rem;
    flex-wrap: wrap;
}
.brand {
    font-weight: 700;
    font-size: 1.15rem;
    color: #111827;
}
.brand:hover { text-decoration: none; color: #2563eb; }
.nav-menu {
    list-style: none;
    display: flex;
    gap: 1.4rem;
    flex-wrap: wrap;
}
.nav-menu a {
    color: #4b5563;
    font-weight: 500;
    font-size: 0.95rem;
}
.nav-menu a.active,
.nav-menu a:hover { color: #2563eb; text-decoration: none; }
.lang-switcher {
    display: flex;
    gap: 0.6rem;
    font-size: 0.85rem;
}
.lang-switcher a { color: #6b7280; }
.lang-switcher .lang-current {
    color: #111827;
    font-weight: 600;
}

/* ============ Hero ============ */
.hero {
    padding: 3rem 0 2rem;
}
.hero-grid {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 2.2rem;
    align-items: center;
}
.hero-avatar img {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid #fff;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
}
.hero-info h1 {
    font-size: 2.2rem;
    font-weight: 700;
    color: #111827;
    margin-bottom: 0.25rem;
}
.hero-info .title {
    color: #111827;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}
.tagline {
    color: #4b5563;
    font-size: 1.0rem;
    margin-bottom: 0.4rem;
}
.affiliation {
    color: #6b7280;
    margin-bottom: 0.7rem;
}
.affiliation-logos {
    display: flex;
    gap: 1.4rem;
    align-items: center;
    margin-bottom: 0.9rem;
    flex-wrap: wrap;
}
.affiliation-logos img {
    height: 28px;
    width: auto;
    opacity: 0.75;
    transition: opacity 0.2s;
}
.affiliation-logos img.logo-square {
    height: 56px;
    opacity: 1;
}
.affiliation-logos a:hover img {
    opacity: 1;
}
.hero-social {
    display: flex;
    gap: 1rem;
    font-size: 1.3rem;
}
.hero-social a { color: #4b5563; }
.hero-social a:hover { color: #2563eb; }

@media (max-width: 640px) {
    .hero-grid { grid-template-columns: 1fr; text-align: center; }
    .hero-avatar { justify-self: center; }
    .hero-avatar img { width: 140px; height: 140px; }
    .hero-social { justify-content: center; }
    .affiliation-logos { justify-content: center; }
}

/* Education + Experience two-column block on About page */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 1.5rem 0 1.8rem;
}
.about-grid > section h3 {
    margin: 0 0 0.6rem;
    font-size: 1.08rem;
    color: #111827;
    font-weight: 600;
}
.about-grid ul {
    margin: 0;
    padding-left: 1.2rem;
    color: #374151;
}
.about-grid li {
    margin-bottom: 0.45rem;
    font-size: 0.95rem;
    line-height: 1.55;
}
.about-grid li small {
    color: #6b7280;
    font-size: 0.85rem;
}
@media (max-width: 720px) {
    .about-grid { grid-template-columns: 1fr; gap: 1.2rem; }
}

/* "See all publications" link */
.see-all {
    margin-top: 1rem;
    font-size: 0.95rem;
}
.see-all a { color: #2563eb; font-weight: 600; }
.see-all a:hover { text-decoration: underline; }

/* ============ Content ============ */
.prose {
    margin: 1.5rem 0;
}
.prose h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #111827;
    margin-top: 2rem;
    margin-bottom: 0.9rem;
    border-bottom: 2px solid #e5e7eb;
    padding-bottom: 0.4rem;
}
.prose h3 {
    font-size: 1.15rem;
    font-weight: 600;
    color: #1f2937;
    margin-top: 1.2rem;
    margin-bottom: 0.5rem;
}
.prose p { margin-bottom: 1rem; }
.prose ul, .prose ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}
.prose li { margin-bottom: 0.4rem; }

/* ============ Sections ============ */
.bio, .news-preview, .pubs-preview {
    margin: 2rem 0;
}
.news-preview h2, .pubs-preview h2,
.page-header h1 {
    font-size: 1.7rem;
    font-weight: 700;
    color: #111827;
    margin-bottom: 1.2rem;
    border-bottom: 2px solid #e5e7eb;
    padding-bottom: 0.5rem;
}
.page-header { margin: 2rem 0; }

/* ============ News ============ */
.news-list {
    list-style: none;
}
.news-list li {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 1rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid #f3f4f6;
}
.news-list time {
    color: #6b7280;
    font-size: 0.9rem;
    font-variant-numeric: tabular-nums;
}
.news-list-full .news-item {
    padding: 1.2rem 0;
    border-bottom: 1px solid #e5e7eb;
}
.news-list-full time {
    color: #6b7280;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.news-list-full h3 {
    margin: 0.3rem 0 0.5rem;
    font-size: 1.15rem;
}

/* ============ Video embed ============ */
.video-embed {
    position: relative;
    width: 100%;
    max-width: 720px;
    margin: 1rem 0 1.5rem;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.08);
}
.video-embed iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* ============ Publications ============ */
.pub-year {
    font-size: 1.3rem;
    color: #2563eb;
    margin: 1.8rem 0 0.8rem;
    font-weight: 700;
}
.pub-item {
    padding: 1rem 0;
    border-bottom: 1px solid #f3f4f6;
}
.pub-item h3,
.pub-item h4 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
}
.pub-item h3 a,
.pub-item h4 a { color: #111827; }
.pub-item h3 a:hover,
.pub-item h4 a:hover { color: #2563eb; }
.pub-authors {
    color: #4b5563;
    font-size: 0.95rem;
    margin-bottom: 0.2rem;
}
.pub-venue {
    color: #6b7280;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}
.pub-links {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    font-size: 0.85rem;
}
.pub-links a {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.25rem 0.7rem;
    background: #f3f4f6;
    color: #374151;
    border-radius: 4px;
    transition: all 0.2s;
}
.pub-links a:hover {
    background: #2563eb;
    color: #fff;
    text-decoration: none;
}
.abstract {
    background: #f9fafb;
    padding: 1rem 1.2rem;
    border-left: 3px solid #2563eb;
    margin: 1.5rem 0;
    border-radius: 4px;
}
.abstract h2 {
    font-size: 1rem;
    margin: 0 0 0.5rem;
    color: #2563eb;
    border: none;
}

/* ============ Footer ============ */
.site-footer {
    margin-top: 4rem;
    padding: 2rem 0;
    border-top: 1px solid #e5e7eb;
    background: #fff;
}
.footer-social {
    display: flex;
    justify-content: center;
    gap: 1.2rem;
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
}
.footer-social a { color: #6b7280; }
.footer-social a:hover { color: #2563eb; }
.copyright {
    text-align: center;
    color: #9ca3af;
    font-size: 0.85rem;
}

/* ============ CV ============ */
.cv-section { margin: 2rem 0; }
.cv-item {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 1.5rem;
    padding: 0.8rem 0;
    border-bottom: 1px solid #f3f4f6;
}
.cv-date {
    color: #6b7280;
    font-size: 0.9rem;
    font-variant-numeric: tabular-nums;
}
.cv-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
}
.cv-content .cv-org {
    color: #4b5563;
    font-size: 0.9rem;
}