/* ============================================================
   MIIL — ShanghaiTech-Themed Custom Styles
   ============================================================ */

/* --- Google Font import --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* --- CSS Variables --- */
:root {
  /* Primary: ShanghaiTech Red */
  --miil-primary: #B51F24;
  --miil-primary-dark: #8C1820;
  --miil-primary-deep: #5E1016;
  --miil-primary-light: #D4323A;

  /* Secondary: ShanghaiTech Gold */
  --miil-gold: #C8A45C;
  --miil-gold-light: #DABB7A;
  --miil-gold-subtle: rgba(200, 164, 92, 0.15);

  /* Neutrals */
  --miil-slate: #2D3A4A;
  --miil-slate-light: #4A5568;
  --miil-text: #3D3D3D;
  --miil-text-light: #666666;
  --miil-bg-warm: #FBF8F4;
  --miil-border: #E8E2DA;
  --miil-white: #FFFFFF;

  /* Derived */
  --miil-gradient: linear-gradient(135deg, var(--miil-primary-dark) 0%, var(--miil-primary) 50%, var(--miil-primary-light) 100%);
  --miil-gradient-hero: linear-gradient(135deg, var(--miil-primary-deep) 0%, var(--miil-primary-dark) 40%, #6E1420 70%, var(--miil-primary-deep) 100%);
  --miil-gradient-card: linear-gradient(135deg, var(--miil-primary) 0%, var(--miil-primary-light) 100%);
  --miil-gradient-gold: linear-gradient(135deg, var(--miil-gold) 0%, var(--miil-gold-light) 100%);
  --miil-shadow: 0 4px 20px rgba(0,0,0,0.06);
  --miil-shadow-hover: 0 8px 30px rgba(45,58,74,0.12);
  --miil-shadow-primary: 0 8px 30px rgba(181,31,36,0.15);
  --miil-radius: 10px;
  --miil-font: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* --- Global resets / typography --- */
body {
  font-family: var(--miil-font);
  color: var(--miil-text);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--miil-font);
  font-weight: 700;
  color: var(--miil-slate);
}

a {
  color: var(--miil-primary);
  transition: color 0.2s;
}
a:hover {
  color: var(--miil-gold);
}

/* --- Navbar tweaks --- */
.navbar {
  font-family: var(--miil-font);
  box-shadow: 0 2px 10px rgba(0,0,0,0.12);
}
.navbar .navbar-brand {
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: 1px;
}
/* Navbar logo image */
.navbar .navbar-brand img {
  height: 28px;
  width: auto;
  vertical-align: middle;
}
.navbar .nav-link {
  font-weight: 500;
  transition: color 0.2s;
}

/* --- Hero section (homepage) --- */
.miil-hero {
  background: var(--miil-gradient-hero);
  color: #fff;
  text-align: center;
  padding: 4rem 2rem 3rem;
  position: relative;
  overflow: hidden;
}
.miil-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 40%, rgba(200,164,92,0.12) 0%, transparent 50%),
              radial-gradient(circle at 70% 60%, rgba(181,31,36,0.15) 0%, transparent 50%);
  animation: heroFloat 15s ease-in-out infinite;
}
@keyframes heroFloat {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-2%, 2%); }
}
.miil-hero h1 {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: 4px;
  margin-bottom: 0.5rem;
  position: relative;
  z-index: 1;
  color: #fff;
}
/* Hero logo (replaces h1 MIIL text) */
.miil-hero-logo {
  max-width: 320px;
  width: 90%;
  height: auto;
  margin-bottom: 0.75rem;
  position: relative;
  z-index: 1;
}
.miil-hero .tagline {
  font-size: 1.4rem;
  font-weight: 300;
  opacity: 0.9;
  margin-bottom: 0.5rem;
  position: relative;
  z-index: 1;
}
.miil-hero .affiliation {
  font-size: 1rem;
  font-weight: 400;
  opacity: 0.75;
  position: relative;
  z-index: 1;
}
.miil-hero .affiliation a {
  color: var(--miil-gold-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(218,187,122,0.4);
  transition: border-color 0.2s;
}
.miil-hero .affiliation a:hover {
  border-bottom-color: var(--miil-gold-light);
}

/* --- Section styling --- */
.miil-section {
  padding: 4rem 1rem;
}
.miil-section:nth-child(even) {
  background: linear-gradient(180deg, var(--miil-bg-warm) 0%, var(--miil-white) 100%);
}
.miil-section-header {
  text-align: center;
  margin-bottom: 2.5rem;
}
.miil-section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--miil-slate);
  position: relative;
  display: inline-block;
  padding-bottom: 0.5rem;
}
.miil-section-header h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  border-radius: 2px;
  background: var(--miil-gradient-gold);
}

/* --- Card components --- */
.miil-card {
  background: var(--miil-white);
  border-radius: var(--miil-radius);
  box-shadow: var(--miil-shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  overflow: hidden;
  height: 100%;
  border: 1px solid var(--miil-border);
}
.miil-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--miil-shadow-primary);
  border-color: rgba(181,31,36,0.2);
}
.miil-card-body {
  padding: 1.5rem;
}
.miil-card-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--miil-slate);
  margin-bottom: 0.5rem;
}
.miil-card-text {
  font-size: 0.9rem;
  color: var(--miil-text-light);
  line-height: 1.5;
}
.miil-card-link {
  display: block;
  text-decoration: none;
  color: inherit;
}

/* --- Research area cards --- */
.miil-research-card {
  background: var(--miil-white);
  border-radius: var(--miil-radius);
  box-shadow: var(--miil-shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  padding: 2rem 1.5rem;
  text-align: center;
  height: 100%;
  border-top: 3px solid var(--miil-primary);
  border-left: 1px solid var(--miil-border);
  border-right: 1px solid var(--miil-border);
  border-bottom: 1px solid var(--miil-border);
}
.miil-research-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--miil-shadow-primary);
  border-top-color: var(--miil-gold);
}
.miil-research-card .icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}
.miil-research-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--miil-slate);
  margin-bottom: 0.5rem;
}
.miil-research-card p {
  font-size: 0.85rem;
  color: var(--miil-text-light);
  line-height: 1.45;
}
.miil-research-card a {
  text-decoration: none;
  color: inherit;
}

/* --- Team member cards --- */
.miil-team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1.5rem;
}
.miil-member-card {
  background: var(--miil-white);
  border-radius: var(--miil-radius);
  box-shadow: var(--miil-shadow);
  padding: 1.5rem 1rem;
  text-align: center;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  border: 1px solid var(--miil-border);
}
.miil-member-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--miil-shadow-hover);
}
.miil-member-card .avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--miil-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  overflow: hidden;
}
.miil-member-card .avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.miil-member-card .avatar .initials {
  color: #fff;
  font-size: 1.5rem;
  font-weight: 700;
}
.miil-member-card .name {
  font-size: 1rem;
  font-weight: 600;
  color: var(--miil-slate);
  margin-bottom: 0.25rem;
}
.miil-member-card .role {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--miil-primary);
  margin-bottom: 0.4rem;
}
.miil-member-card .topic {
  font-size: 0.78rem;
  color: var(--miil-text-light);
  line-height: 1.4;
}

/* --- PI card (larger) --- */
.miil-pi-card {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  flex-wrap: wrap;
  background: var(--miil-white);
  border-radius: var(--miil-radius);
  box-shadow: var(--miil-shadow);
  padding: 2rem;
  margin-bottom: 2rem;
  border: 1px solid var(--miil-border);
  text-align: center;
}
.miil-pi-card .pi-photo {
  flex: 0 0 180px;
  text-align: center;
}
.miil-pi-card .pi-photo img {
  width: 180px;
  height: auto;
  border-radius: var(--miil-radius);
  box-shadow: 0 2px 10px rgba(0,0,0,0.08);
}
.miil-pi-card .pi-info {
  flex: 1;
  min-width: 0;
}
.miil-pi-card .pi-info h2 {
  font-size: 1.6rem;
  color: var(--miil-slate);
  margin-bottom: 0.25rem;
}
.miil-pi-card .pi-info .pi-title {
  color: var(--miil-gold);
  font-weight: 500;
  margin-bottom: 0.75rem;
}
.miil-pi-card .pi-info p {
  font-size: 0.92rem;
  line-height: 1.65;
  color: var(--miil-text);
  overflow-wrap: break-word;
  word-break: break-word;
}

/* --- Publication tabs --- */
.miil-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--miil-border);
  margin-bottom: 2rem;
}
.miil-tab {
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  color: #888;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: color 0.2s, border-color 0.2s;
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}
.miil-tab:hover {
  color: var(--miil-primary);
}
.miil-tab.active {
  color: var(--miil-primary);
  border-bottom-color: var(--miil-primary);
}
.miil-tab-content {
  display: none;
}
.miil-tab-content.active {
  display: block;
}
.miil-pub-item {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--miil-border);
  font-size: 0.9rem;
  line-height: 1.55;
}
.miil-pub-item:last-child {
  border-bottom: none;
}
.miil-pub-item .pub-title {
  font-weight: 600;
  color: var(--miil-slate);
}
.miil-pub-item .pub-title a {
  color: var(--miil-primary);
  text-decoration: none;
}
.miil-pub-item .pub-title a:hover {
  color: var(--miil-gold);
  text-decoration: underline;
}
.miil-pub-item .pub-journal {
  font-style: italic;
  color: var(--miil-text-light);
}

/* --- Join Us CTA --- */
.miil-cta {
  background: var(--miil-gradient);
  color: #fff;
  border-radius: var(--miil-radius);
  padding: 3rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.miil-cta h2 {
  color: #fff;
  font-size: 1.8rem;
  margin-bottom: 1rem;
}
.miil-cta p {
  font-size: 0.95rem;
  opacity: 0.9;
  max-width: 700px;
  margin: 0 auto 1.5rem;
  line-height: 1.6;
}
.miil-cta .btn-cta {
  display: inline-block;
  background: var(--miil-white);
  color: var(--miil-primary);
  padding: 0.75rem 2rem;
  border-radius: 50px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
}
.miil-cta .btn-cta:hover {
  transform: scale(1.03);
  box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  background: var(--miil-gold);
  color: var(--miil-primary-deep);
}

/* --- Alumni list --- */
.miil-alumni-group {
  margin-bottom: 2rem;
}
.miil-alumni-group h3 {
  font-size: 1.2rem;
  color: var(--miil-primary);
  border-bottom: 2px solid var(--miil-border);
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}
.miil-alumni-entry {
  padding: 0.6rem 0;
  font-size: 0.9rem;
  line-height: 1.55;
  border-bottom: 1px solid var(--miil-bg-warm);
}
.miil-alumni-entry:last-child {
  border-bottom: none;
}
.miil-alumni-entry .alumni-name {
  font-weight: 600;
  color: var(--miil-slate);
}
.miil-alumni-entry .alumni-year {
  color: var(--miil-gold);
  font-weight: 500;
  font-size: 0.85rem;
}
.miil-alumni-entry .alumni-thesis {
  color: var(--miil-text-light);
  font-style: italic;
}
.miil-alumni-entry .alumni-now {
  color: #555;
  font-size: 0.85rem;
}

/* --- Research topic page: overall wrapper --- */
.miil-research-page .miil-section {
  padding: 2.5rem 0;
}
.miil-research-page .miil-section:first-child {
  padding-top: 0;
}
.miil-research-page .miil-section:last-child {
  padding-bottom: 1rem;
}




/* --- Research topic page: Abstract section --- */
.miil-abstract-section .miil-abstract-text {
  max-width: 800px;
  margin: 0 auto;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--miil-text);
}

/* --- Research topic page: Paper card --- */
.miil-paper-section .miil-paper-card {
  background: var(--miil-white);
  border: 1px solid var(--miil-border);
  border-radius: var(--miil-radius);
  box-shadow: var(--miil-shadow);
  padding: 2rem;
  max-width: 800px;
  margin: 0 auto;
  transition: box-shadow 0.25s ease;
}
.miil-paper-section .miil-paper-card:hover {
  box-shadow: var(--miil-shadow-hover);
}
.miil-paper-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--miil-slate);
  margin-bottom: 0.75rem;
}
.miil-paper-title a {
  color: var(--miil-primary);
  text-decoration: none;
}
.miil-paper-title a:hover {
  color: var(--miil-gold);
  text-decoration: underline;
}
.miil-paper-authors {
  font-size: 0.92rem;
  color: var(--miil-text-light);
  line-height: 1.5;
  margin-bottom: 0.5rem;
}
.miil-paper-venue {
  font-style: italic;
  color: var(--miil-text-light);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}
.miil-paper-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.miil-paper-link {
  display: inline-block;
  background: var(--miil-gradient);
  color: #fff;
  padding: 0.4rem 1.2rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
}
.miil-paper-link:hover {
  transform: scale(1.04);
  box-shadow: 0 4px 14px rgba(181,31,36,0.25);
  color: #fff;
  text-decoration: none;
}


/* --- Research topic page hero --- */
.miil-topic-hero {
  background: var(--miil-gradient-hero);
  color: #fff;
  padding: 4rem 2rem 3rem;
  text-align: center;
  margin: -2rem -2rem 2rem -2rem;
}
.miil-topic-hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: #fff;
}
.miil-topic-hero p {
  font-size: 1.1rem;
  opacity: 0.85;
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.6;
}

/* --- Responsive adjustments --- */
@media (max-width: 768px) {
  .miil-hero h1 {
    font-size: 2rem;
    letter-spacing: 3px;
  }
  .miil-hero-logo {
    max-width: 220px;
  }
  .miil-hero .tagline {
    font-size: 1.1rem;
  }
  .miil-pi-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .miil-pi-card .pi-photo {
    flex: 0 0 auto;
  }
  .miil-pi-card .pi-info {
    min-width: 0;
    max-width: 100%;
  }
  .miil-team-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  }
  .miil-tabs {
    flex-wrap: wrap;
  }
  .miil-topic-hero {
    padding: 3rem 1rem 2rem;
  }
  .miil-topic-hero h1 {
    font-size: 1.8rem;
  }
}

/* --- Footer tweaks --- */
footer {
  font-family: var(--miil-font);
}

/* --- Email contact button (anti-scrape) --- */
.btn-email {
  display: inline-block;
  background: var(--miil-gradient);
  color: #fff;
  padding: 0.4rem 1.2rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--miil-font);
  border: none;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
  vertical-align: middle;
  letter-spacing: 0.3px;
}
.btn-email:hover {
  transform: scale(1.04);
  box-shadow: 0 4px 14px rgba(181,31,36,0.25);
  background: var(--miil-primary-dark);
  color: #fff;
}