/* ===========================
   Nexabio — Site Stylesheet
   =========================== */

:root {
  --navy: #0F2A4A;
  --navy-deep: #081A30;
  --cyan: #1DB5E8;
  --cyan-dark: #1399C7;
  --cyan-soft: #E8F7FD;
  --white: #FFFFFF;
  --gray-bg: #F5F7FA;
  --gray-border: #E1E5EB;
  --gray-line: #EEF1F5;
  --text-dark: #1A1F2E;
  --text-body: #3E4759;
  --text-muted: #6B7488;
  --shadow-sm: 0 1px 2px rgba(15, 42, 74, 0.04);
  --shadow-md: 0 4px 16px rgba(15, 42, 74, 0.06);
  --shadow-lg: 0 12px 32px rgba(15, 42, 74, 0.08);
  --radius-sm: 4px;
  --radius-md: 8px;
  --max-width: 1200px;
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-body);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--cyan-dark); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--navy); }

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

/* === Typography === */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--navy);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

h1 { font-size: clamp(2.4rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.4rem); margin-bottom: 1rem; }
h3 { font-size: 1.25rem; font-weight: 600; font-family: var(--font-body); letter-spacing: -0.01em; }
h4 { font-size: 0.85rem; font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.12em; color: var(--cyan-dark); font-weight: 500; }

p { margin-bottom: 1rem; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--cyan-dark);
  font-weight: 500;
  margin-bottom: 1rem;
  display: inline-block;
}

.lead {
  font-size: 1.15rem;
  color: var(--text-body);
  line-height: 1.7;
  max-width: 640px;
}

/* === Header === */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-border);
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.logo-link { display: block; }
.logo-link img { height: 38px; width: auto; }

.main-nav {
  display: flex;
  align-items: center;
  gap: 36px;
}

.main-nav a {
  color: var(--text-dark);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
  padding: 4px 0;
}

.main-nav a.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--cyan);
  transition: width 0.25s ease;
}

.main-nav a.nav-link:hover::after,
.main-nav a.nav-link.active::after { width: 100%; }

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  font-family: var(--font-body);
  letter-spacing: 0.01em;
}

.btn-primary {
  background: var(--navy);
  color: var(--white);
}
.btn-primary:hover {
  background: var(--navy-deep);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: transparent;
  color: var(--navy);
  border: 1px solid var(--gray-border);
}
.btn-secondary:hover {
  border-color: var(--navy);
  color: var(--navy);
}

.btn-cyan {
  background: var(--cyan);
  color: var(--white);
}
.btn-cyan:hover {
  background: var(--cyan-dark);
  color: var(--white);
  transform: translateY(-1px);
}

/* === Hero === */
.hero {
  position: relative;
  padding: 100px 0 80px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at top right, rgba(29, 181, 232, 0.06), transparent 60%),
    linear-gradient(180deg, var(--white) 0%, var(--gray-bg) 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero h1 {
  margin-bottom: 24px;
}

.hero .lead {
  margin-bottom: 36px;
  font-size: 1.2rem;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
  height: 380px;
}

/* DNA helix decoration */
.helix-svg {
  width: 100%;
  height: 100%;
}

/* === Sections === */
section {
  padding: 80px 0;
}

.section-light { background: var(--white); }
.section-gray { background: var(--gray-bg); }
.section-navy {
  background: var(--navy);
  color: var(--white);
}
.section-navy h1, .section-navy h2, .section-navy h3 { color: var(--white); }
.section-navy .eyebrow { color: var(--cyan); }

.section-header {
  max-width: 720px;
  margin-bottom: 56px;
}

.section-header.center {
  margin: 0 auto 56px;
  text-align: center;
}

/* === Pillars (3-column) === */
.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.pillar {
  background: var(--white);
  padding: 36px 28px;
  border: 1px solid var(--gray-border);
  border-radius: var(--radius-md);
  transition: all 0.25s ease;
  position: relative;
}

.pillar:hover {
  border-color: var(--cyan);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.pillar-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 20px;
  color: var(--cyan-dark);
}

.pillar h3 {
  color: var(--navy);
  margin-bottom: 12px;
}

.pillar p {
  color: var(--text-body);
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* === Category cards === */
.categories {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.category-card {
  background: var(--white);
  padding: 32px;
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-border);
  border-top: 3px solid var(--cyan);
  transition: all 0.25s ease;
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-top-color: var(--navy);
}

.category-card .cat-number {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  margin-bottom: 14px;
  display: block;
}

.category-card h3 {
  color: var(--navy);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.3rem;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.category-card p {
  font-size: 0.95rem;
  color: var(--text-body);
  margin-bottom: 0;
}

/* === Audience strip === */
.audience-strip {
  background: var(--navy);
  color: var(--white);
  padding: 60px 0;
  position: relative;
  overflow: hidden;
}

.audience-strip::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: radial-gradient(circle at right, rgba(29, 181, 232, 0.12), transparent 70%);
  pointer-events: none;
}

.audience-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 60px;
  align-items: center;
  position: relative;
}

.audience-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px 32px;
}

.audience-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.92);
}

.audience-item::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--cyan);
  border-radius: 50%;
  flex-shrink: 0;
}

/* === CTA banner === */
.cta-banner {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-deep) 100%);
  color: var(--white);
  padding: 72px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
}

.cta-banner h2 {
  color: var(--white);
  margin-bottom: 16px;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.85);
  max-width: 540px;
  margin: 0 auto 32px;
  font-size: 1.1rem;
}

/* === About-page-specific === */
.about-hero {
  padding: 80px 0 60px;
  background: linear-gradient(180deg, var(--white) 0%, var(--gray-bg) 100%);
  text-align: center;
}

.about-hero .tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.4rem;
  color: var(--cyan-dark);
  font-weight: 400;
  margin-top: 12px;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 72px;
  align-items: start;
}

.approach-block {
  margin-bottom: 36px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--gray-border);
}

.approach-block:last-child {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 0;
}

.approach-block h3 {
  color: var(--navy);
  margin-bottom: 8px;
  display: flex;
  align-items: baseline;
  gap: 16px;
}

.approach-block h3::before {
  content: counter(approach-counter, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--cyan);
  font-weight: 500;
}

.approach-list { counter-reset: approach-counter; }
.approach-block { counter-increment: approach-counter; }

.capabilities-list {
  list-style: none;
  padding: 0;
}

.capabilities-list li {
  padding: 18px 0;
  border-bottom: 1px solid var(--gray-line);
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--text-dark);
  font-size: 1rem;
}

.capabilities-list li:last-child { border-bottom: none; }

.capabilities-list li::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--cyan);
  flex-shrink: 0;
  transform: rotate(45deg);
}

/* === Contact === */
.contact-hero {
  padding: 80px 0 40px;
  background: linear-gradient(180deg, var(--white) 0%, var(--gray-bg) 100%);
}

.contact-hero h1 { margin-bottom: 16px; }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 60px;
  align-items: start;
  padding-bottom: 80px;
  background: var(--gray-bg);
}

.contact-info {
  position: sticky;
  top: 100px;
}

.contact-info h3 {
  color: var(--navy);
  margin-bottom: 24px;
}

.contact-item {
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--gray-border);
}

.contact-item:last-child { border-bottom: none; }

.contact-item .label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 6px;
  display: block;
}

.contact-item .value {
  font-size: 1.05rem;
  color: var(--text-dark);
  font-weight: 500;
}

.contact-item .value a { color: var(--text-dark); }
.contact-item .value a:hover { color: var(--cyan-dark); }

.contact-form-wrap {
  background: var(--white);
  padding: 44px;
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-border);
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: 22px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-dark);
  margin-bottom: 8px;
  letter-spacing: 0.01em;
}

.form-group label .req { color: var(--cyan-dark); }

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--gray-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--text-dark);
  background: var(--white);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(29, 181, 232, 0.12);
}

.form-group textarea {
  resize: vertical;
  min-height: 130px;
  font-family: var(--font-body);
}

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 24px;
  padding: 16px;
  background: var(--cyan-soft);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--cyan);
}

.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin-top: 2px;
  accent-color: var(--cyan-dark);
  flex-shrink: 0;
  cursor: pointer;
}

.checkbox-group label {
  font-size: 0.9rem;
  color: var(--text-dark);
  line-height: 1.5;
  margin-bottom: 0;
  cursor: pointer;
}

.form-submit {
  width: 100%;
  padding: 14px 24px;
  font-size: 1rem;
}

.research-notice {
  margin-top: 24px;
  padding: 16px 20px;
  background: var(--gray-bg);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.55;
  border-left: 3px solid var(--gray-border);
}

/* === Compliance footer block === */
.compliance-block {
  background: var(--navy-deep);
  color: rgba(255, 255, 255, 0.7);
  padding: 36px 0;
  font-size: 0.85rem;
  line-height: 1.7;
  text-align: center;
}

.compliance-block .container {
  max-width: 920px;
}

.compliance-block strong {
  color: var(--cyan);
  font-weight: 500;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 10px;
}

/* === Footer === */
.site-footer {
  background: var(--navy-deep);
  color: rgba(255, 255, 255, 0.6);
  padding: 32px 0;
  font-size: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.7);
}
.site-footer a:hover { color: var(--cyan); }

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

/* === Responsive === */
@media (max-width: 960px) {
  .hero-grid,
  .audience-grid,
  .two-col,
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .pillars, .categories { grid-template-columns: 1fr 1fr; }
  .hero-visual { height: 280px; }
  .contact-info { position: static; }
}

@media (max-width: 640px) {
  .container, .header-inner { padding-left: 20px; padding-right: 20px; }
  .main-nav { gap: 18px; }
  .main-nav a.nav-link { display: none; }
  .pillars, .categories, .audience-list, .form-row { grid-template-columns: 1fr; }
  section, .hero { padding: 60px 0; }
  .contact-form-wrap { padding: 28px 22px; }
  .footer-inner { justify-content: center; text-align: center; }
}

/* === Subtle entry animation === */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.hero h1, .hero .lead, .hero-cta, .hero-visual {
  animation: fadeUp 0.7s ease-out backwards;
}
.hero .lead { animation-delay: 0.1s; }
.hero-cta { animation-delay: 0.2s; }
.hero-visual { animation-delay: 0.15s; }