/* ICON Lab – White & grey theme, blue accents */

:root {
  --bg-page: #ffffff;
  --bg-alt: #f7f7f7;
  --bg-card: #ffffff;
  /* 与 logo 蓝色统一，偏深一些 */
  --logo-blue: #1d5bbf;
  --accent: var(--logo-blue);
  --accent-hover: #164a9e;
  --text-primary: #1a1a1a;
  --text-muted: #555555;
  --border: #e0e0e0;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-page);
  min-height: 100vh;
}

/* Header & nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1000px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
}

.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.nav-logo-img {
  display: block;
  height: 42px;
  width: auto;
  max-height: 42px;
  max-width: 156px;
  object-fit: contain;
  object-position: left center;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav-toggle {
  display: none;
  width: 2rem;
  height: 2rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  position: relative;
}

.nav-toggle::before,
.nav-toggle::after {
  content: '';
  position: absolute;
  left: 0.5rem;
  right: 0.5rem;
  height: 2px;
  background: var(--text-primary);
  top: 50%;
  transform: translateY(-50%);
}

.nav-toggle::before {
  margin-top: -5px;
}

.nav-toggle::after {
  margin-top: 5px;
}

/* Main content */
main {
  position: relative;
  z-index: 1;
}

.container {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Banner: rules after .container — explicit column width for wide viewports (Chrome) */
.site-banner {
  width: 100%;
  border-bottom: 1px solid var(--border);
  background: var(--bg-page);
}

.site-banner .container.site-banner-container {
  width: 100%;
  max-width: 1000px;
  max-width: min(100%, 1000px);
  margin-left: auto;
  margin-right: auto;
  padding: 0.75rem 1.5rem;
  line-height: 0;
  min-width: 0;
  overflow: hidden;
  box-sizing: border-box;
}

.site-banner-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  min-width: 0;
}

/* Sections */
.section {
  padding: 3rem 0;
  border-bottom: 1px solid var(--border);
}

.section:nth-child(even) {
  background: var(--bg-alt);
}

.section-title {
  margin: 0 0 1.5rem;
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--logo-blue);
}

/* About */
.about-institution {
  margin: 0 0 0.5rem;
  font-size: 1.125rem;
  color: var(--text-muted);
}

.about-text {
  margin: 0 0 1rem;
  color: var(--text-primary);
  max-width: 100%;
}

.about-heading {
  margin: 1rem 0 0.5rem;
  font-size: 1rem;
  color: var(--logo-blue);
}

.about-interests {
  margin: 0;
  padding-left: 1.5rem;
  color: var(--text-primary);
}

/* Team subsection titles (Director, Members) */
.team-subsection {
  margin: 0 0 1rem;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Team: Director row — one person, photo left + intro right, same card & photo size as Members */
.team-row-featured {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.team-row-featured.team-card-director {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  transition: border-color 0.2s, border-width 0.2s;
}

.team-row-featured.team-card-director:hover {
  border: 2px solid var(--accent);
}

/* Photo same width as one card in the 3-column row: 1/3 of (row minus gap) */
.team-featured-photo {
  flex: 0 0 calc((100% - 2rem) / 3);
  max-width: 320px;
}

.team-featured-photo .team-photo {
  margin-bottom: 0;
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 6px;
}

.team-featured-bio {
  flex: 1;
  min-width: 280px;
}

.team-bio-featured {
  margin-top: 0.5rem;
  font-size: 1rem;
  line-height: 1.6;
}

/* Team: Members row — three people, photo + one line each */
.team-row-three {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 0;
}

.team-row-three.team-row-spaced {
  margin-bottom: 2.5rem;
}

.team-card.team-card-inline {
  text-align: center;
}

.team-card-inline .team-photo {
  margin-bottom: 0.75rem;
}

.team-card-inline .team-bio {
  font-size: 0.9rem;
  margin: 0;
}

/* Team grid (legacy) */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.team-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  transition: border-color 0.2s, border-width 0.2s;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.team-card:hover {
  border: 2px solid var(--accent);
}

.team-photo {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 6px;
  margin-bottom: 0.75rem;
}

.team-name {
  margin: 0 0 0.25rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.team-role {
  margin: 0 0 0.5rem;
  font-size: 0.875rem;
  color: var(--accent);
}

.team-bio {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.team-loading,
.projects-loading,
.news-loading {
  color: var(--text-muted);
  margin: 0;
}

/* Projects list */
.projects-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.project-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s, border-width 0.2s, background 0.2s;
}

.project-card:hover {
  border: 2px solid var(--accent);
  background: var(--bg-alt);
}

.project-title {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
}

.project-excerpt {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.project-link-text {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--accent);
}

/* News list */
.news-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.news-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s, border-width 0.2s, background 0.2s;
}

.news-card:hover {
  border: 2px solid var(--accent);
  background: var(--bg-alt);
}

.news-date {
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 0.25rem;
}

.news-title {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.news-excerpt {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.news-link-text {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--accent);
}

/* Contact */
.contact-content p {
  margin: 0.5rem 0;
  color: var(--text-primary);
}

.contact-content a {
  color: var(--accent);
  text-decoration: none;
}

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

/* Footer */
.site-footer {
  padding: 1.5rem;
  text-align: center;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.875rem;
}

.site-footer p {
  margin: 0;
}

/* Detail page layout (news/projects) — 与 nav 同宽、同缩进，灰色背景不超出 logo 左侧 */
.page-header {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  background: var(--bg-alt);
  background-clip: content-box;
  background-origin: content-box;
  border-bottom: 1px solid var(--border);
}

.page-title {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 600;
  color: var(--text-primary);
}

.page-date {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.page-content {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  color: var(--text-primary);
}

.page-content p {
  margin: 0 0 1rem;
}

.page-content a {
  color: var(--accent);
  text-decoration: none;
}

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

/* Responsive YouTube embed */
.video-embed {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 */
  margin: 1.5rem 0;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
}

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

/* Responsive */
@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-page);
    padding: 1rem;
    border-bottom: 1px solid var(--border);
  }

  .nav-links.is-open {
    display: flex;
  }

  .section {
    padding: 2rem 0;
  }

  .team-grid {
    grid-template-columns: 1fr;
  }

  .team-row-featured {
    flex-direction: column;
    align-items: center;
  }

  .team-featured-photo {
    flex: 0 0 auto;
    max-width: 220px;
  }

  .team-featured-bio {
    min-width: 0;
  }

  .team-row-three {
    grid-template-columns: 1fr;
  }
}