/* ===================================================
   AIR Research Group – Global Stylesheet
   Modern, tech-oriented design
   =================================================== */

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

/* ── CSS Variables ── */
:root {
  --bg-primary:    #f8fafc;
  --bg-secondary:  #f1f5f9;
  --bg-card:       #ffffff;
  --bg-card-hover: #f8fafc;
  --border:        rgba(0,0,0,0.08);
  --border-hover:  rgba(79,70,229,0.4);

  --accent-1: #4f46e5;   /* indigo */
  --accent-2: #0891b2;   /* teal   */
  --accent-3: #7c3aed;   /* violet */
  --gradient: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  --gradient-alt: linear-gradient(135deg, var(--accent-3), var(--accent-1));

  --text-primary:   #0f172a;
  --text-secondary: #475569;
  --text-muted:     #94a3b8;

  --nav-h: 70px;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-glow: 0 8px 32px rgba(79,70,229,0.12);
  --transition: 0.25s ease;
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
}

a { color: var(--accent-2); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-3); }

h1,h2,h3,h4,h5 { line-height: 1.2; font-weight: 700; }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); }

img { max-width: 100%; display: block; }

/* ── Utility ── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section    { padding: 80px 0; }
.section-sm { padding: 50px 0; }

.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: rgba(79,70,229,0.07);
  color: var(--accent-1);
  border: 1px solid rgba(79,70,229,0.18);
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 6px;
  font-size: 0.73rem;
  font-weight: 500;
  background: rgba(8,145,178,0.08);
  color: var(--accent-2);
  border: 1px solid rgba(8,145,178,0.2);
  margin: 3px 2px;
}

.section-header { text-align: center; margin-bottom: 56px; }
.section-header .badge { margin-bottom: 14px; }
.section-header h2 { margin-bottom: 14px; }
.section-header p { color: var(--text-secondary); max-width: 600px; margin: 0 auto; font-size: 1.05rem; }

/* Gradient text */
.grad { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.grad-alt { background: var(--gradient-alt); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

/* ── Navigation ── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 1000;
  background: rgba(248,250,252,0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 rgba(0,0,0,0.05);
  transition: background 0.3s;
}

.nav-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
}

.nav-logo {
  display: flex; align-items: center; gap: 12px;
  text-decoration: none;
}

.nav-logo img { height: 36px; width: auto; filter: brightness(0); }

.nav-logo-text {
  display: flex; flex-direction: column; line-height: 1;
}

.nav-logo-text .logo-name {
  font-size: 1.3rem; font-weight: 800;
  color: #fff;
  background: var(--gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.nav-logo-text .logo-sub {
  font-size: 0.65rem; font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-links {
  display: flex; align-items: center; gap: 6px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem; font-weight: 500;
  padding: 8px 14px;
  border-radius: 8px;
  transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-1);
  background: rgba(79,70,229,0.06);
}

/* Dropdown */
.nav-dropdown { position: relative; }

.nav-dropdown > a::after { content: ' ▾'; font-size: 0.7rem; opacity: 0.6; }

.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%; left: 50%;
  transform: translateX(-50%);
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px;
  padding-top: 14px;   /* visual gap inside, not a real gap */
  min-width: 200px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  list-style: none;
}

/* Invisible bridge so the cursor doesn't "leave" the element */
.nav-dropdown::after {
  content: '';
  position: absolute;
  top: 100%; left: 0; right: 0;
  height: 14px;
}

.nav-dropdown:hover .dropdown-menu { display: block; }

.dropdown-menu a {
  display: block; padding: 9px 14px;
  color: var(--text-secondary);
  font-size: 0.875rem;
  border-radius: 8px;
}

.dropdown-menu a:hover {
  color: var(--accent-1);
  background: rgba(79,70,229,0.06);
}

.nav-cta {
  background: var(--gradient) !important;
  color: #fff !important;
  font-weight: 600 !important;
  padding: 8px 20px !important;
  border-radius: 8px !important;
}

.nav-cta:hover { opacity: 0.85; background: var(--gradient) !important; }

/* Hamburger */
.nav-toggle { display: none; cursor: pointer; flex-direction: column; gap: 5px; padding: 4px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--text-secondary); border-radius: 2px; transition: var(--transition); }

/* ── Hero ── */
.hero {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-h);
}

.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(79,70,229,0.1) 0%, transparent 70%),
    radial-gradient(ellipse 50% 50% at 80% 80%, rgba(8,145,178,0.07) 0%, transparent 60%),
    var(--bg-primary);
}

.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(79,70,229,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79,70,229,0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.hero-content {
  position: relative; z-index: 1;
  text-align: center;
  max-width: 860px;
  padding: 60px 24px;
}

.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px;
  border-radius: 100px;
  background: rgba(79,70,229,0.07);
  border: 1px solid rgba(79,70,229,0.18);
  color: var(--accent-1);
  font-size: 0.8rem; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase;
  margin-bottom: 28px;
}

.hero-eyebrow::before { content: '●'; color: var(--accent-2); font-size: 0.5rem; }

.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 640px; margin-left: auto; margin-right: auto;
}

.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; margin-bottom: 64px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-weight: 600; font-size: 0.95rem;
  transition: all var(--transition);
  cursor: pointer; border: none;
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 0 30px rgba(99,102,241,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 40px rgba(99,102,241,0.5); color: #fff; }

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--accent-1); background: rgba(79,70,229,0.07); color: var(--accent-1); transform: translateY(-2px); }

/* Stats bar */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.stat-item {
  background: #ffffff;
  padding: 20px 16px;
  text-align: center;
}

.stat-number {
  font-size: 2rem; font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
  line-height: 1;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── Research Pillars (Home) ── */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.pillar-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.pillar-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.pillar-card:nth-child(1)::before { background: linear-gradient(90deg, #6366f1, #8b5cf6); }
.pillar-card:nth-child(2)::before { background: linear-gradient(90deg, #06b6d4, #6366f1); }
.pillar-card:nth-child(3)::before { background: linear-gradient(90deg, #8b5cf6, #06b6d4); }

.pillar-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.pillar-icon {
  font-size: 2.4rem;
  margin-bottom: 20px;
  display: block;
}

.pillar-card h3 { margin-bottom: 12px; }
.pillar-card p { color: var(--text-secondary); font-size: 0.95rem; }

/* ── Featured Projects (Home) ── */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  display: flex; flex-direction: column; gap: 14px;
}

.project-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.project-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.project-card h3 { flex: 1; }

.project-meta {
  display: flex; flex-wrap: wrap; gap: 8px;
  font-size: 0.82rem; color: var(--text-muted);
}

.project-meta span { display: flex; align-items: center; gap: 4px; }

.project-card p { color: var(--text-secondary); font-size: 0.92rem; flex: 1; }

.project-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.85rem; font-weight: 600;
  color: var(--accent-2);
  transition: gap var(--transition);
}
.project-link:hover { gap: 10px; color: var(--accent-2); }

/* ── Video embed (iframe) ── */
.video-wrapper {
  position: relative; padding-bottom: 56.25%; height: 0;
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--border);
}
.video-wrapper iframe { position: absolute; inset: 0; width: 100%; height: 100%; }

/* ── YouTube thumbnail link ── */
.yt-thumb {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  display: block;
}

.yt-thumb img { transition: transform 0.4s ease, filter 0.4s ease; }
.yt-thumb:hover img { transform: scale(1.02); filter: brightness(0.7); }

.yt-play-btn {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 72px; height: 72px;
  border-radius: 50%;
  background: rgba(255,0,0,0.9);
  color: #fff;
  font-size: 1.6rem;
  display: flex; align-items: center; justify-content: center;
  padding-left: 4px;       /* optical centering of ▶ */
  box-shadow: 0 4px 24px rgba(0,0,0,0.5);
  transition: transform 0.25s ease, background 0.25s ease;
  pointer-events: none;
}
.yt-thumb:hover .yt-play-btn {
  transform: translate(-50%, -50%) scale(1.12);
  background: rgba(255,0,0,1);
}

/* ── Publications ── */
.pub-list { display: flex; flex-direction: column; gap: 16px; }

.pub-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  transition: all var(--transition);
  display: flex; gap: 20px; align-items: flex-start;
}

.pub-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
}

.pub-year {
  min-width: 48px;
  font-size: 0.8rem; font-weight: 700;
  color: var(--accent-1);
  font-family: 'JetBrains Mono', monospace;
  padding-top: 2px;
}

.pub-content { flex: 1; }
.pub-title { font-weight: 600; margin-bottom: 6px; font-size: 0.96rem; }
.pub-authors { color: var(--text-muted); font-size: 0.83rem; margin-bottom: 6px; }
.pub-journal { color: var(--accent-2); font-size: 0.83rem; font-style: italic; margin-bottom: 8px; }

.pub-if {
  display: inline-block;
  font-size: 0.72rem; font-weight: 700;
  padding: 2px 8px; border-radius: 4px;
  background: rgba(79,70,229,0.07); color: var(--accent-1);
  border: 1px solid rgba(79,70,229,0.18);
}

.pub-doi-link {
  display: inline-flex; align-items: center;
  font-size: 0.78rem; font-weight: 600;
  color: var(--accent-2);
  padding: 2px 10px; border-radius: 4px;
  border: 1px solid rgba(8,145,178,0.25);
  background: rgba(8,145,178,0.06);
  transition: all var(--transition);
}
.pub-doi-link:hover {
  background: rgba(8,145,178,0.12);
  border-color: rgba(8,145,178,0.45);
  color: var(--accent-2);
}

/* Year filter tabs */
.filter-tabs {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin-bottom: 36px;
}

.filter-tab {
  padding: 7px 18px;
  border-radius: 100px;
  font-size: 0.85rem; font-weight: 500;
  cursor: pointer;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: all var(--transition);
}

.filter-tab:hover,
.filter-tab.active {
  background: rgba(79,70,229,0.07);
  border-color: rgba(79,70,229,0.3);
  color: var(--accent-1);
}

/* ── Thesis ── */
.thesis-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }

.thesis-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
  display: flex; flex-direction: column; gap: 12px;
  position: relative;
  overflow: hidden;
}

.thesis-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.thesis-card:hover { border-color: var(--border-hover); transform: translateY(-3px); box-shadow: var(--shadow); }
.thesis-card:hover::after { transform: scaleX(1); }

.thesis-candidate { color: var(--accent-2); font-size: 0.88rem; font-weight: 600; }
.thesis-date { color: var(--text-muted); font-size: 0.82rem; }
.thesis-card h3 { font-size: 1.02rem; }
.thesis-card p { color: var(--text-secondary); font-size: 0.88rem; flex: 1; }
.thesis-tags { display: flex; flex-wrap: wrap; }

.thesis-defended {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.78rem; font-weight: 600;
  color: #10b981;
  background: rgba(16,185,129,0.1);
  border: 1px solid rgba(16,185,129,0.25);
  padding: 3px 10px; border-radius: 100px;
}

.thesis-card.is-defended {
  opacity: 0.85;
  border-color: rgba(16,185,129,0.2);
}
.thesis-card.is-defended::after { background: linear-gradient(90deg, #10b981, #06b6d4); }

/* ── People ── */
.people-section-title {
  font-size: 0.8rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 24px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.people-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 48px;
}

.person-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px 16px;
  text-align: center;
  transition: all var(--transition);
}

.person-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.person-avatar {
  width: 72px; height: 72px;
  border-radius: 50%;
  margin: 0 auto 14px;
  background: var(--gradient);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; font-weight: 700; color: #fff;
  flex-shrink: 0;
}

.person-name { font-weight: 600; font-size: 0.92rem; margin-bottom: 4px; }
.person-role { font-size: 0.77rem; color: var(--text-muted); }

/* ── Partners Table ── */
.partners-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.partners-table th {
  background: rgba(79,70,229,0.06);
  color: var(--accent-1);
  font-weight: 600;
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.partners-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  vertical-align: top;
}

.partners-table tr:last-child td { border-bottom: none; }

.partners-table tr:hover td { background: rgba(79,70,229,0.03); }
.partners-table td:first-child { color: var(--text-primary); font-weight: 500; }

.table-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  overflow-x: auto;
}

/* ── Spin-off / Transfer ── */
.spinoff-hero {
  background: linear-gradient(135deg, rgba(79,70,229,0.05), rgba(8,145,178,0.04));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
  margin-bottom: 48px;
}

.spinoff-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: 100px;
  background: rgba(124,58,237,0.07); border: 1px solid rgba(124,58,237,0.2);
  color: var(--accent-3); font-size: 0.8rem; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 16px;
}

.spinoff-hero h2 { font-size: 2.2rem; margin-bottom: 16px; }
.spinoff-hero p { color: var(--text-secondary); margin-bottom: 24px; font-size: 0.97rem; line-height: 1.75; }

.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}
.service-card:hover { border-color: var(--border-hover); background: var(--bg-card-hover); transform: translateY(-2px); }

.service-icon { font-size: 1.8rem; margin-bottom: 12px; }
.service-card h4 { font-size: 0.95rem; margin-bottom: 8px; }
.service-card p { font-size: 0.85rem; color: var(--text-secondary); }

/* ── Page Hero (inner pages) ── */
.page-hero {
  padding: 120px 24px 64px;
  text-align: center;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 70% 50% at 50% -5%, rgba(79,70,229,0.08) 0%, transparent 60%),
    var(--bg-primary);
}

.page-hero h1 { font-size: clamp(2rem, 4vw, 3rem); margin-bottom: 14px; }
.page-hero p { color: var(--text-secondary); font-size: 1.05rem; max-width: 560px; margin: 0 auto; }

/* ── Footer ── */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 60px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin: 14px 0 20px;
  line-height: 1.7;
}

.footer-logo-text {
  font-size: 1.5rem; font-weight: 800;
  background: var(--gradient);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.footer-col h4 {
  font-size: 0.8rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-col a { color: var(--text-secondary); font-size: 0.88rem; transition: color var(--transition); }
.footer-col a:hover { color: var(--text-primary); }

.footer-contact p {
  font-size: 0.85rem;
  color: var(--text-muted);
  display: flex; align-items: flex-start; gap: 8px;
  line-height: 1.5; margin-bottom: 10px;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 28px;
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px;
}

.footer-bottom p { color: var(--text-muted); font-size: 0.82rem; }

.footer-univ { display: flex; align-items: center; gap: 12px; }
.footer-univ a { color: var(--text-muted); font-size: 0.82rem; transition: color var(--transition); }
.footer-univ a:hover { color: var(--accent-2); }

/* ── Project Detail Card ── */
.project-detail {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 32px;
  transition: border-color var(--transition);
}
.project-detail:hover { border-color: var(--border-hover); }

.project-detail-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.project-detail-info  { padding: 40px; }
.project-detail-meta  { padding: 40px; background: rgba(0,0,0,0.02); border-left: 1px solid var(--border); display: flex; flex-direction: column; gap: 18px; }

.meta-row label {
  display: block;
  font-size: 0.75rem; text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--text-muted);
  margin-bottom: 5px;
}
.meta-row .meta-value { color: var(--text-primary); font-weight: 500; font-size: 0.9rem; }
.meta-row .meta-budget { font-size: 1.4rem; font-weight: 800; background: var(--gradient); -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text; }
.meta-row .meta-award  { color: #f59e0b; font-size: 0.9rem; }

/* ── Contact grid ── */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; max-width: 900px; margin: 0 auto; }
.contact-info-card { background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius-lg); padding:36px; display:flex; flex-direction:column; gap:20px; }
.contact-link-stack { display: flex; flex-direction: column; gap: 16px; }

.contact-item { display: flex; align-items: flex-start; gap: 12px; }
.contact-item-icon { color: var(--accent-1); font-size: 1.1rem; padding-top: 2px; }
.contact-item-label { font-weight: 600; font-size: 0.9rem; margin-bottom: 3px; }
.contact-item-value { color: var(--text-secondary); font-size: 0.87rem; }

.contact-quick-card { background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius); padding:24px; transition: border-color var(--transition), background var(--transition); }
.contact-quick-card:hover { border-color: var(--border-hover); background: var(--bg-card-hover); }
.contact-quick-card h4 { margin-bottom: 8px; font-size: 0.95rem; }
.contact-quick-card p { color: var(--text-secondary); font-size: 0.85rem; margin-bottom: 14px; }

/* ── PhD join box ── */
.phd-join-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.phd-area-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 24px; }
.phd-area-item { display: flex; align-items: center; gap: 10px; color: var(--text-secondary); font-size: 0.9rem; }
.phd-area-item span:first-child { color: var(--accent-1); }
.phd-contact-box { background: rgba(0,0,0,0.02); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; }
.phd-contact-box h4 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin-bottom: 16px; }
.phd-contact-entry { margin-bottom: 14px; }
.phd-contact-entry .name { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 4px; }

/* ── Responsive ── */
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .spinoff-hero { grid-template-columns: 1fr; }
  .project-detail-body { grid-template-columns: 1fr; }
  .project-detail-meta { border-left: none; border-top: 1px solid var(--border); }
  .contact-grid { grid-template-columns: 1fr; }
  .phd-join-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: flex; }

  .navbar {
    background: rgba(248,250,252,0.98);
    overflow: visible;
  }
  .nav-inner { position: relative; }
  .nav-logo { gap: 10px; }
  .nav-logo img { height: 30px; filter: brightness(0); }
  .nav-logo-text .logo-name { font-size: 1.1rem; }
  .nav-logo-text .logo-sub {
    display: block;
    font-size: 0.58rem;
    letter-spacing: 0.06em;
  }

  .nav-links.open {
    display: flex; flex-direction: column;
    align-items: stretch;
    position: absolute; top: 100%; left: 0; right: 0;
    max-height: calc(100dvh - var(--nav-h));
    background: rgba(248,250,252,0.98);
    border-top: 1px solid var(--border);
    padding: 20px 24px 28px;
    gap: 4px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    z-index: 1001;
  }

  .nav-links.open > li > a {
    display: block;
    width: 100%;
    text-align: left;
  }

  .nav-links.open .dropdown-menu {
    display: block; position: static;
    transform: none; background: transparent;
    border: none; box-shadow: none;
    padding: 0 0 0 16px;
  }

  .hero h1 { font-size: 2.4rem; }
  .hero-stats { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: 1fr; }
  .spinoff-hero { padding: 28px; }
}

@media (max-width: 480px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .container { padding: 0 16px; }
  .section { padding: 56px 0; }
}

/* Navbar scrolled state */
.navbar.scrolled {
  background: rgba(248,250,252,0.98);
  box-shadow: 0 2px 24px rgba(0,0,0,0.07);
}

/* ── Fade-in animation ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-up { animation: fadeUp 0.6s ease forwards; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

/* intersection observer fallback */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }