/* ===== DA-Lab Global Styles ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --red-dark:   #3E0008;
  --red-mid:    #8B0018;
  --red-bright: #CC0020;
  --red-light:  #FEF0F0;
  --red-tint:   #F9F3F3;
  --border:     #EBD8D8;
  --text-primary:   #1A1A1A;
  --text-secondary: #555;
  --text-muted:     #999;
  --bg-white: #ffffff;
  --bg-light: #F7F1F1;
}

body {
  font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-primary);
  background: var(--bg-white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; }

/* ===== NAV ===== */
nav {
  background: var(--red-dark);
  height: 64px;
  display: flex;
  align-items: center;
  padding: 0 48px;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 11px;
}

.nav-logo-text {
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.5px;
  font-family: Georgia, serif;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  font-size: 16px;
  color: rgba(255,255,255,0.65);
  transition: color 0.2s;
}

.nav-links a:hover { color: #fff; }
.nav-links a.active { color: #fff; font-weight: 600; }

/* ===== PAGE HEADER ===== */
.page-header {
  background: #F9F3F3;
  border-bottom: 2px solid #EBD8D8;
  padding: 48px 48px 44px;
}

.page-header .label {
  font-size: 11px;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: #8B0018;
  margin-bottom: 10px;
}

.page-header h1 {
  font-size: 36px;
  font-weight: 700;
  font-family: Georgia, serif;
  line-height: 1.2;
  color: #3E0008;
}

.page-header p {
  font-size: 15px;
  color: #888;
  margin-top: 10px;
  max-width: 560px;
  line-height: 1.7;
}

/* ===== MAIN CONTENT ===== */
main { flex: 1; }

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 48px;
}

/* ===== SECTION DIVIDER ===== */
.section-label {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--red-mid);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
  margin-bottom: 28px;
}

/* ===== FOOTER ===== */
footer {
  background: #160003;
  padding: 36px 48px 20px;
  margin-top: auto;
}

.footer-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  gap: 0;
  margin-bottom: 24px;
}

.footer-brand { flex: 0 0 200px; }

.footer-logo-row {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 10px;
}

.footer-logo-text {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  font-family: Georgia, serif;
}

.footer-tagline {
  font-size: 12px;
  color: rgba(255,255,255,0.4);
  line-height: 1.75;
}

.footer-divider {
  width: 1px;
  background: rgba(255,255,255,0.1);
  margin: 0 40px;
  align-self: stretch;
  flex-shrink: 0;
}

.footer-cols {
  flex: 1;
  display: flex;
  justify-content: space-between;
}

.footer-col h4 {
  font-size: 10px;
  letter-spacing: 1.6px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.28);
  margin-bottom: 12px;
}

.footer-col p,
.footer-col a {
  font-size: 12.5px;
  color: rgba(255,255,255,0.58);
  line-height: 1.85;
  display: block;
}

.footer-col a:hover { color: #fff; }

.footer-bottom {
  max-width: 960px;
  margin: 0 auto;
  border-top: 1px solid rgba(255,255,255,0.07);
  padding-top: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-copy { font-size: 11.5px; color: rgba(255,255,255,0.22); }

.footer-socials { display: flex; gap: 18px; }
.footer-socials a { font-size: 12px; color: rgba(255,255,255,0.35); }
.footer-socials a:hover { color: #fff; }

/* ===== TAG BADGE ===== */
.tag {
  display: inline-block;
  background: var(--red-light);
  color: var(--red-mid);
  font-size: 11px;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 4px;
}

.tag.green { background: #F0FAF0; color: #2A7A2A; }
.tag.blue  { background: #EEF4FF; color: #1A4FA0; }

/* ===== CARDS ===== */
.card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}

.card:hover { border-color: #D4A0A0; box-shadow: 0 4px 16px rgba(62,0,8,0.07); }

/* ===== HAMBURGER & MOBILE MENU ===== */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: rgba(255,255,255,0.85);
  border-radius: 2px;
  transition: all 0.25s;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  z-index: 200;
}
.mobile-menu-overlay.open { display: block; }
.mobile-menu-panel {
  position: absolute;
  top: 0; right: 0;
  width: 220px;
  height: 100%;
  background: var(--red-dark);
  padding: 80px 0 32px;
  display: flex;
  flex-direction: column;
}
.mobile-nav-link {
  padding: 14px 28px;
  color: rgba(255,255,255,0.75);
  font-size: 15px;
  font-weight: 500;
  border-bottom: 1px solid rgba(255,255,255,0.07);
  transition: background 0.15s;
}
.mobile-nav-link:hover, .mobile-nav-link.active {
  color: #fff;
  background: rgba(255,255,255,0.08);
}

/* ===== RESPONSIVE ===== */
body { overflow-x: hidden; }

@media (max-width: 768px) {
  nav { padding: 0 16px; }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .nav-logo-text { font-size: 18px; }
  .container { padding: 0 16px; }
  .page-header { padding: 32px 16px 28px; }
  .page-header h1 { font-size: 26px; }
  footer { padding: 28px 16px 16px; }
  .footer-inner { flex-direction: column; gap: 24px; }
  .footer-divider { display: none; }
  .footer-cols { flex-wrap: wrap; gap: 20px; }

  /* index */
  .cards-grid { grid-template-columns: 1fr !important; }
  .news-item { flex-direction: column; gap: 8px; }

  /* members - prof card */
  .prof-card .prof-inner,
  [style*="grid-template-columns: 130px"] {
    display: block !important;
  }
  .prof-photo { width: 100px !important; height: 100px !important; margin-bottom: 14px; }

  /* members - student grid */
  .students-grid { grid-template-columns: 1fr 1fr !important; }

  /* publications */
  .filter-bar { gap: 6px; }
  .filter-btn { font-size: 12px; padding: 5px 12px; }

  /* research */
  .topic-grid { grid-template-columns: 1fr 1fr !important; }
  .area-card { padding: 20px 16px; }

  /* contact */
  .contact-grid { grid-template-columns: 1fr !important; }
}

@media (max-width: 480px) {
  .page-header h1 { font-size: 22px; }
  .students-grid { grid-template-columns: 1fr !important; }
  .topic-grid { grid-template-columns: 1fr !important; }
  .pub-body .title { font-size: 13.5px; }
}