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

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

:root {
  --bg:              #F9FAFB;
  --bg-dark:         #1F2937; /* primary_color */
  --accent:          #3B82F6; /* accent_color */
  --accent-hover:    #2563EB;
  --accent-light:    #DBEAFE;
  --text:            #1F2937; /* primary_color */
  --text-muted:      #4B5563; /* muted_text_color */
  --border:          #E5E7EB;
  --card-bg:         #FFFFFF;
  --placeholder-bg:  #F3F4F6;

  /* Reserved category colors — not yet wired to specific content */
  --grants-color:          #1D4E8F;
  --collaborations-color:  #15803D;
  --knowledge-base-color:  #C43500;

  --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --nav-height: 64px;
  --max-width:  1100px;
  --radius:     8px;
  --shadow:     0 2px 16px rgba(15,23,42,0.06);
  --shadow-hover: 0 8px 28px rgba(15,23,42,0.12);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.7;
  padding-top: var(--nav-height);
}

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

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

/* ── Navigation ───────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: var(--bg-dark);
  z-index: 1000;
  display: flex;
  align-items: center;
  padding: 0 2rem;
  gap: 2rem;
}

.nav-brand {
  font-size: 1.05rem;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 0.01em;
  white-space: nowrap;
  flex-shrink: 0;
}
.nav-brand:hover { color: var(--accent-light); }

.nav-links {
  display: flex;
  align-items: stretch;
  gap: 0.15rem;
  list-style: none;
  margin-left: auto;
  flex-wrap: wrap;
  align-self: stretch;
}

.nav-links > li {
  position: relative;
  display: flex;
  align-items: center;
}

.nav-links > li > a {
  display: flex;
  align-items: center;
  padding: 0 0.9rem;
  height: 100%;
  color: #D1D5DB;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: 4px;
  transition: color 0.2s, background 0.2s;
  white-space: nowrap;
}

.nav-links > li > a:hover,
.nav-links > li.active > a {
  color: #FFFFFF;
  background: rgba(255,255,255,0.08);
}

/* Mobile hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: #D1D5DB;
  font-size: 1.5rem;
  margin-left: auto;
  padding: 0.25rem;
}

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  min-height: calc(80vh - var(--nav-height));
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 5rem 2rem;
  background: var(--bg-dark);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 65% 30%, rgba(59,130,246,0.20) 0%, transparent 60%),
              radial-gradient(ellipse at 15% 85%, rgba(59,130,246,0.12) 0%, transparent 55%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero-eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #93C5FD;
  font-weight: 600;
  margin-bottom: 1.2rem;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800;
  color: #FFFFFF;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.hero-title em {
  color: #60A5FA;
  font-style: normal;
}

.hero-tagline {
  font-size: 1.1rem;
  color: #9CA3AF;
  font-weight: 400;
  line-height: 1.8;
  max-width: 540px;
  margin: 0 auto 2.5rem;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.8rem 1.6rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent);
  color: #FFFFFF;
}
.btn-primary:hover { background: var(--accent-hover); color: #FFFFFF; transform: translateY(-1px); }

.btn-outline {
  background: transparent;
  border-color: rgba(255,255,255,0.3);
  color: #FFFFFF;
}
.btn-outline:hover { border-color: #FFFFFF; background: rgba(255,255,255,0.08); color: #FFFFFF; }

/* ── Page Header (subpages) ──────────────────────────────── */
.page-header {
  background: var(--bg-dark);
  padding: 3.5rem 2rem 3rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 100%, rgba(59,130,246,0.16) 0%, transparent 60%);
}

.page-header-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
}

.breadcrumb {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #9CA3AF;
  margin-bottom: 0.75rem;
}

.breadcrumb a { color: #D1D5DB; }
.breadcrumb a:hover { color: #FFFFFF; }
.breadcrumb span { margin: 0 0.4rem; }

.page-title {
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 800;
  color: #FFFFFF;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.page-subtitle {
  font-size: 1rem;
  color: #9CA3AF;
  margin-top: 0.75rem;
  font-weight: 400;
}

/* ── Container ────────────────────────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
}

.section { padding: 4rem 0; }
.section + .section { padding-top: 0; }

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.section-rule {
  width: 40px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin: 0 0 1.5rem;
}

.section-lead {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 680px;
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

/* ── About Strip (home) ───────────────────────────────────── */
.about-strip {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 4rem 2rem;
}

.about-strip-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.about-strip h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text);
}

.about-strip p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.85;
  margin-bottom: 0.8rem;
}

.about-strip p:last-child { margin-bottom: 0; }

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.tag {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  background: var(--accent-light);
  color: var(--accent-hover);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  border-radius: 100px;
}

/* ── Cards Grid (home) ────────────────────────────────────── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.card {
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
  transition: box-shadow 0.25s, transform 0.25s, border-color 0.25s;
  color: inherit;
}

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

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--accent-light);
  color: var(--accent-hover);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 1.1rem;
}

.card-label {
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
  margin-bottom: 0.6rem;
}

.card-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1.1rem;
}

.card-link {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.card-link:hover { border-color: var(--accent); }
.card-link::after { content: '\2192'; font-size: 0.9em; }

/* ── Content Section (subpages) ───────────────────────────── */
.content-section {
  padding: 3rem 0;
  border-bottom: 1px solid var(--border);
}

.content-section:last-of-type { border-bottom: none; }

.content-section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.4rem;
}

.content-section h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin: 1.5rem 0 0.5rem;
}

.content-section p {
  color: var(--text-muted);
  font-size: 0.98rem;
  line-height: 1.85;
  max-width: 720px;
  margin-bottom: 1rem;
}

.section-divider {
  width: 36px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin: 0 0 1.5rem;
}

/* ── Sub-section Cards (products, etc.) ───────────────────── */
.subsection-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}

.subsection-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: box-shadow 0.2s, transform 0.2s, border-color 0.2s;
}

.subsection-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
  border-color: var(--accent);
}

.subsection-card .badge {
  font-size: 0.72rem;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.subsection-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.subsection-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1rem;
}

.subsection-card a.view-link {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--accent);
}

/* ── Placeholder Elements ─────────────────────────────────── */
.placeholder-img {
  background: var(--placeholder-bg);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  color: #9CA3AF;
  font-size: 0.82rem;
  font-weight: 500;
  text-align: center;
  padding: 2rem 1rem;
  min-height: 180px;
}

.placeholder-img::before {
  content: '\25A1';
  font-size: 1.8rem;
  opacity: 0.5;
}

/* ── Two-Column Layout ────────────────────────────────────── */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

/* ── Contact ──────────────────────────────────────────────── */
.contact-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.25rem;
  max-width: 480px;
}

.contact-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}

.contact-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

/* ── Footer ───────────────────────────────────────────────── */
footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.45);
  text-align: center;
  padding: 2rem;
  font-size: 0.8rem;
  letter-spacing: 0.03em;
}

footer a {
  color: rgba(255,255,255,0.6);
}

footer a:hover { color: #FFFFFF; }

/* ── Utility ──────────────────────────────────────────────── */
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-0 { margin-bottom: 0; }

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 900px) {
  .cards-grid { grid-template-columns: repeat(2, 1fr); }
  .subsection-cards { grid-template-columns: repeat(2, 1fr); }
  .two-col { grid-template-columns: 1fr; gap: 2rem; }
  .about-strip-inner { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 720px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: var(--nav-height); left: 0; right: 0; background: var(--bg-dark); padding: 1rem 0; border-top: 1px solid rgba(255,255,255,0.08); }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .nav-links > li > a { padding: 0.7rem 1.5rem; }

  .cards-grid { grid-template-columns: 1fr; }
  .subsection-cards { grid-template-columns: 1fr; }
  .hero-title { font-size: 2.4rem; }
}