/* ==========================================================================
   Nutrition Research Lab by AIXC Bio — Main Stylesheet
   Palette: Olive #3D4F2F | Teal #2E7B7B | Bone #F5F1EB | Dark #1A2332
   Typography: Cormorant Garamond (headings) | DM Sans (body) | JetBrains Mono (data)
   Breakpoints: 768px (tablet) | 480px (mobile)
   ========================================================================== */

:root {
  --lab-dark: #1A2332;
  --lab-dark-light: #2A3545;
  --lab-bone: #F5F1EB;
  --lab-olive: #3D4F2F;
  --lab-olive-light: #5A7044;
  --lab-olive-pale: #E8EDE4;
  --lab-teal: #2E7B7B;
  --lab-teal-light: #3A9494;
  --lab-sage: #E8EDE4;
  --lab-parchment: #EFE9DF;
  --lab-slate: #4A5568;
  --lab-white: #FFFFFF;
  --lab-border: #D4CFC6;
  --lab-warning-bg: #FFF8E7;
  --lab-warning-border: #D4A853;
  --shadow-sm: 0 2px 8px rgba(26, 35, 50, 0.06);
  --shadow-md: 0 6px 24px rgba(26, 35, 50, 0.1);
  --shadow-lg: 0 16px 48px rgba(26, 35, 50, 0.16);
  --shadow-olive: 0 4px 20px rgba(61, 79, 47, 0.2);
  --shadow-teal: 0 4px 20px rgba(46, 123, 123, 0.2);
  --radius: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: 0.28s ease;
  --nav-height: 72px;
  --font-heading: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --font-body: 'DM Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Courier New', monospace;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--lab-dark);
  background-color: var(--lab-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-weight: 400;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--lab-dark);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); font-weight: 700; }
h2 { font-size: clamp(1.75rem, 4vw, 2.8rem); }
h3 { font-size: clamp(1.3rem, 2.8vw, 1.8rem); }
h4 { font-size: 1.05rem; font-family: var(--font-body); font-weight: 600; letter-spacing: 0.02em; text-transform: uppercase; color: var(--lab-slate); }

p { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--lab-teal);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover { color: var(--lab-teal-light); }

img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ----- Utility ----- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-padding {
  padding: 5rem 0;
}

.text-center { text-align: center; }
.narrow { max-width: 720px; margin: 0 auto; }

/* ----- Buttons ----- */
.btn {
  display: inline-block;
  padding: 0.85rem 2.4rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1;
  text-align: center;
  border-radius: var(--radius);
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  letter-spacing: 0.01em;
}

.btn-primary {
  background-color: var(--lab-teal);
  color: var(--lab-white);
  border-color: var(--lab-teal);
}

.btn-primary:hover {
  background-color: var(--lab-teal-light);
  border-color: var(--lab-teal-light);
  color: var(--lab-white);
  box-shadow: var(--shadow-teal);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--lab-olive);
  border-color: var(--lab-olive);
}

.btn-secondary:hover {
  background-color: var(--lab-olive);
  color: var(--lab-white);
  transform: translateY(-1px);
}

.btn-ghost {
  background-color: transparent;
  color: var(--lab-teal);
  border-color: transparent;
  padding: 0.6rem 1rem;
}

.btn-ghost:hover {
  color: var(--lab-teal-light);
  background-color: rgba(46, 123, 123, 0.06);
}

/* ----- Section Labels & Eyebrows ----- */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--lab-teal);
  margin-bottom: 0.75rem;
  display: block;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--lab-teal);
  margin-bottom: 1rem;
}

/* ----- Hero Background Image ----- */
.hero-bg-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.12;
  pointer-events: none;
}

/* ----- Navigation ----- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--lab-border);
  z-index: 1000;
  transition: box-shadow var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--lab-dark);
  letter-spacing: -0.02em;
}

.nav-logo:hover {
  color: var(--lab-olive);
}

.nav-logo span {
  font-weight: 400;
  font-size: 0.8rem;
  color: var(--lab-slate);
  display: block;
  font-family: var(--font-body);
  letter-spacing: 0.02em;
  margin-top: -2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-links a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--lab-slate);
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius);
  transition: all var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--lab-dark);
  background-color: var(--lab-bone);
}

.nav-cta {
  margin-left: 0.75rem;
}

.nav-cta .btn {
  padding: 0.6rem 1.5rem;
  font-size: 0.85rem;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  flex-direction: column;
  gap: 5px;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--lab-dark);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ----- Hero ----- */
.hero {
  padding: calc(var(--nav-height) + 4rem) 0 4rem;
  background: linear-gradient(175deg, var(--lab-bone) 0%, var(--lab-white) 45%, var(--lab-sage) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -20%;
  right: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(46, 123, 123, 0.06) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -15%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(61, 79, 47, 0.05) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero-content {
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 1;
}

.hero h1 {
  margin-bottom: 1.5rem;
}

.hero-tagline {
  font-size: 1.1rem;
  line-height: 1.75;
  color: var(--lab-slate);
  max-width: 680px;
  margin: 0 auto 2.5rem;
}

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

/* ----- Buyer Strip ----- */
.buyer-strip {
  background: var(--lab-dark);
  padding: 1.5rem 0;
}

.buyer-strip .container {
  text-align: center;
}

.buyer-strip p {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 1rem;
  font-weight: 400;
}

.buyer-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.buyer-tag {
  display: inline-block;
  padding: 0.45rem 1.2rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 100px;
  font-size: 0.82rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  transition: all var(--transition);
}

.buyer-tag:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.25);
  color: var(--lab-white);
}

/* ----- Sections ----- */
.section {
  padding: 5rem 0;
}

.section-copy {
  max-width: 760px;
}

.section-copy.centered {
  margin: 0 auto;
  text-align: center;
}

.section-copy h2 {
  margin-bottom: 1.25rem;
}

.section-copy p {
  color: var(--lab-slate);
  font-size: 1.05rem;
  line-height: 1.75;
}

.section-alt {
  background-color: var(--lab-bone);
}

.section-sage {
  background-color: var(--lab-sage);
}

.section-parchment {
  background-color: var(--lab-parchment);
}

/* ----- Cards Grid ----- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.card {
  background: var(--lab-white);
  border: 1px solid var(--lab-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition);
  position: relative;
}

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

.card h3 {
  margin-bottom: 0.75rem;
  font-size: 1.4rem;
}

.card p {
  color: var(--lab-slate);
  font-size: 0.95rem;
  line-height: 1.7;
}

.card-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.65rem;
  background: var(--lab-sage);
  color: var(--lab-olive);
  border-radius: var(--radius);
  margin-bottom: 0.75rem;
  font-weight: 500;
}

/* ----- Feature/Method Lists ----- */
.feature-list {
  list-style: none;
}

.feature-list li {
  padding: 0.7rem 0;
  padding-left: 1.75rem;
  position: relative;
  color: var(--lab-dark);
  font-size: 0.95rem;
  border-bottom: 1px solid var(--lab-border);
}

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

.feature-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 8px;
  height: 8px;
  background: var(--lab-teal);
  border-radius: 50%;
}

/* ----- Two Column Layout ----- */
.two-col {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: start;
}

.two-col h2 {
  margin-bottom: 1.25rem;
}

.two-col p {
  color: var(--lab-slate);
  font-size: 1.02rem;
}

/* ----- Question List ----- */
.question-list {
  max-width: 760px;
  margin: 2rem auto 0;
}

.question-list li {
  padding: 1rem 0 1rem 2rem;
  border-bottom: 1px solid var(--lab-border);
  color: var(--lab-dark);
  font-size: 1rem;
  line-height: 1.65;
  position: relative;
}

.question-list li:first-child {
  border-top: 1px solid var(--lab-border);
}

.question-list li::before {
  content: 'Q';
  position: absolute;
  left: 0;
  top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--lab-teal);
  background: rgba(46, 123, 123, 0.08);
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
}

/* ----- Scope/Warning Block ----- */
.scope-block {
  background: var(--lab-warning-bg);
  border: 1px solid var(--lab-warning-border);
  border-radius: var(--radius-md);
  padding: 2rem 2.5rem;
  max-width: 680px;
  margin: 3rem auto 0;
}

.scope-block .section-label {
  color: #9A7B2D;
}

.scope-block h2 {
  font-size: 1.4rem;
  margin-bottom: 0.75rem;
}

.scope-block p {
  color: var(--lab-slate);
  font-size: 0.95rem;
}

/* ----- CTA Section ----- */
.cta-section {
  background: var(--lab-dark);
  padding: 4.5rem 0;
  text-align: center;
}

.cta-section h2 {
  color: var(--lab-white);
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  max-width: 640px;
  margin: 0 auto 2rem;
}

.cta-section .btn-primary {
  background-color: var(--lab-teal);
  border-color: var(--lab-teal);
}

.cta-section .btn-primary:hover {
  background-color: var(--lab-teal-light);
  border-color: var(--lab-teal-light);
}

/* ----- Report Type Detail Cards ----- */
.report-card {
  background: var(--lab-white);
  border: 1px solid var(--lab-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  margin-bottom: 1.5rem;
  transition: all var(--transition);
}

.report-card:hover {
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

.report-card h3 {
  margin-bottom: 0.75rem;
  color: var(--lab-olive);
}

.report-card > p {
  color: var(--lab-slate);
  margin-bottom: 1.25rem;
}

.report-includes {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.5rem;
}

.report-includes li {
  padding: 0.4rem 0 0.4rem 1.5rem;
  position: relative;
  font-size: 0.9rem;
  color: var(--lab-dark);
}

.report-includes li::before {
  content: '+';
  position: absolute;
  left: 0;
  color: var(--lab-teal);
  font-family: var(--font-mono);
  font-weight: 600;
}

/* ----- Audience Segments ----- */
.segment {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--lab-border);
}

.segment:first-of-type {
  border-top: 1px solid var(--lab-border);
}

.segment h3 {
  margin-bottom: 0.75rem;
  color: var(--lab-olive);
}

.segment p {
  color: var(--lab-slate);
  max-width: 680px;
  margin-bottom: 0.75rem;
}

.segment-fit {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.35rem 0.85rem;
  background: var(--lab-sage);
  color: var(--lab-olive);
  border-radius: var(--radius);
  letter-spacing: 0.02em;
}

/* ----- Topic Clusters ----- */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.topic-card {
  background: var(--lab-white);
  border: 1px solid var(--lab-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition);
}

.topic-card:hover {
  box-shadow: var(--shadow-md);
  border-color: transparent;
  transform: translateY(-2px);
}

.topic-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.6rem;
  color: var(--lab-olive);
}

.topic-card p {
  color: var(--lab-slate);
  font-size: 0.92rem;
  line-height: 1.65;
}

.topic-icon {
  width: 40px;
  height: 40px;
  background: var(--lab-sage);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

/* ----- Workflow Steps ----- */
.workflow-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin: 2.5rem 0;
}

.workflow-step {
  text-align: center;
  position: relative;
  padding: 2rem 1rem;
}

.workflow-step::after {
  content: '';
  position: absolute;
  right: -0.75rem;
  top: 50%;
  width: 1.5rem;
  height: 2px;
  background: var(--lab-border);
}

.workflow-step:last-child::after {
  display: none;
}

.step-number {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--lab-teal);
  color: var(--lab-white);
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
}

.workflow-step p {
  font-size: 0.92rem;
  color: var(--lab-dark);
  font-weight: 500;
}

/* ----- Methods List ----- */
.methods-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.methods-grid li {
  padding: 0.6rem 0 0.6rem 1.5rem;
  position: relative;
  font-size: 0.92rem;
  color: var(--lab-slate);
}

.methods-grid li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: var(--lab-olive);
  border-radius: 50%;
}

/* ----- Contact Form ----- */
.form-section {
  max-width: 640px;
  margin: 0 auto;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--lab-dark);
  margin-bottom: 0.4rem;
  letter-spacing: 0.01em;
}

.form-group input,
.form-group select,
.form-group textarea {
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--lab-border);
  border-radius: var(--radius);
  background: var(--lab-white);
  color: var(--lab-dark);
  transition: all var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--lab-teal);
  box-shadow: 0 0 0 3px rgba(46, 123, 123, 0.12);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%234A5568' d='M1 1l5 5 5-5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.form-disclaimer {
  font-size: 0.82rem;
  color: var(--lab-slate);
  margin-top: 1rem;
  padding: 1rem;
  background: var(--lab-bone);
  border-radius: var(--radius);
  text-align: center;
}

.form-submit {
  margin-top: 1.5rem;
  text-align: center;
}

/* ----- About Bullets ----- */
.about-bullets {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}

.about-bullet {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem;
  background: var(--lab-white);
  border: 1px solid var(--lab-border);
  border-radius: var(--radius-md);
}

.about-bullet-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  background: var(--lab-sage);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}

.about-bullet p {
  font-size: 0.92rem;
  color: var(--lab-dark);
  font-weight: 500;
  margin: 0;
}

/* ----- Credibility Block ----- */
.credibility-block {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.credibility-block h2 {
  margin-bottom: 1rem;
}

.credibility-block > p {
  color: var(--lab-slate);
  font-size: 1.05rem;
  line-height: 1.75;
  max-width: 680px;
  margin: 0 auto 2rem;
}

.credibility-block a {
  color: var(--lab-teal);
  font-weight: 500;
}

.credibility-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin: 2rem 0;
}

.cred-stat {
  text-align: center;
}

.cred-number {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 600;
  color: var(--lab-olive);
  margin-bottom: 0.3rem;
}

.cred-label {
  font-size: 0.82rem;
  color: var(--lab-slate);
  line-height: 1.4;
}

.credibility-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.6rem;
  margin: 1.5rem 0;
}

.cred-badge {
  display: inline-block;
  padding: 0.4rem 1rem;
  background: var(--lab-white);
  border: 1px solid var(--lab-border);
  border-radius: 100px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--lab-dark);
  letter-spacing: 0.02em;
}

.cred-note {
  font-size: 0.92rem;
  color: var(--lab-slate);
  margin-top: 1.5rem;
}

/* ----- Paper Cards ----- */
.paper-section {
  padding: 3rem 0;
}

.paper-section .section-label {
  display: block;
  margin-bottom: 0.5rem;
}

.paper-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.paper-card {
  background: var(--lab-white);
  border: 1px solid var(--lab-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.paper-card:hover {
  border-color: var(--lab-olive);
  box-shadow: 0 4px 20px rgba(61,79,47,0.1);
  transform: translateY(-2px);
}

.paper-card-top {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.9rem;
  flex-wrap: wrap;
}

.paper-venue-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.25rem 0.7rem;
  border-radius: 4px;
  border: 1px solid transparent;
  text-decoration: none;
  transition: all 0.2s;
}

.paper-venue-badge:hover {
  filter: brightness(0.9);
}

.paper-venue-badge.aaai {
  background: rgba(46,125,50,0.1);
  color: #2E7D32;
  border-color: rgba(46,125,50,0.2);
}

.paper-venue-badge.iclr {
  background: rgba(21,101,192,0.1);
  color: #1565C0;
  border-color: rgba(21,101,192,0.2);
}

.paper-venue-badge.neurips {
  background: rgba(230,81,0,0.1);
  color: #E65100;
  border-color: rgba(230,81,0,0.2);
}

.paper-venue-badge.ai4x {
  background: rgba(123,31,162,0.1);
  color: #7B1FA2;
  border-color: rgba(123,31,162,0.2);
}

.paper-venue-badge.ellis {
  background: rgba(0,105,92,0.1);
  color: #00695C;
  border-color: rgba(0,105,92,0.2);
}

.paper-venue-badge.mlgenx {
  background: rgba(103,58,183,0.1);
  color: #673AB7;
  border-color: rgba(103,58,183,0.2);
}

.paper-type-badge {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: 3px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.paper-type-badge.oral {
  background: rgba(198,40,40,0.12);
  color: #C62828;
}

.paper-type-badge.poster {
  background: rgba(21,101,192,0.1);
  color: #1565C0;
}

.paper-card h4 {
  font-family: var(--font-heading);
  font-size: 1.08rem;
  font-weight: 600;
  color: var(--lab-dark);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.paper-card .paper-authors {
  font-size: 0.82rem;
  color: var(--lab-slate);
  margin-bottom: 0.6rem;
}

.paper-card .paper-authors strong {
  color: var(--lab-dark);
  font-weight: 600;
}

.paper-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.6rem;
}

.paper-tag {
  padding: 0.2rem 0.65rem;
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 600;
  background: rgba(46,123,123,0.08);
  border: 1px solid rgba(46,123,123,0.15);
  color: var(--lab-teal);
}

.paper-tag.tag-olive {
  background: rgba(61,79,47,0.08);
  border-color: rgba(61,79,47,0.15);
  color: var(--lab-olive);
}

.paper-tag.tag-purple {
  background: rgba(123,31,162,0.08);
  border-color: rgba(123,31,162,0.15);
  color: #7B1FA2;
}

.paper-card .paper-relevance {
  font-size: 0.85rem;
  color: var(--lab-olive);
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px solid var(--lab-border);
  line-height: 1.45;
}

.paper-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 2rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--lab-teal);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: gap 0.2s;
}

.paper-link:hover {
  gap: 0.6rem;
  text-decoration: none;
}

/* ----- Molecular Video ----- */
.video-container {
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 2rem 0;
  background: #0a0f1a;
  max-height: 420px;
}

.video-container video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ----- Research Gallery ----- */
.research-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin: 2rem 0;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.research-gallery-item {
  border-radius: var(--radius-md);
  overflow: hidden;
  position: relative;
  cursor: pointer;
}

.research-gallery-item img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease, filter 0.3s;
}

.research-gallery-item:hover img {
  transform: scale(1.05);
  filter: brightness(1.05);
}

.research-gallery-item .gallery-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(26,35,50,0.9));
  color: var(--lab-white);
  padding: 2rem 1rem 0.75rem;
  transition: padding-bottom 0.3s;
}

.research-gallery-item:hover .gallery-caption {
  padding-bottom: 1rem;
}

.gallery-caption .caption-venue {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  background: rgba(45,212,191,0.2);
  color: #5eead4;
  margin-bottom: 0.35rem;
}

.gallery-caption .caption-text {
  font-size: 0.85rem;
  font-weight: 500;
  line-height: 1.3;
}

/* ----- Published Methods ----- */
.method-paper-links {
  margin-top: 1.5rem;
}

.method-paper-link {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--lab-border);
  transition: padding-left 0.2s;
}

.method-paper-link:last-child {
  border-bottom: none;
}

.method-paper-link:hover {
  padding-left: 0.5rem;
}

.method-paper-link .method-paper-badge {
  flex-shrink: 0;
}

.method-paper-link p {
  font-size: 0.9rem;
  color: var(--lab-dark);
  line-height: 1.4;
  font-family: var(--font-heading);
}

.method-paper-link p span {
  display: block;
  font-size: 0.8rem;
  color: var(--lab-slate);
  margin-top: 0.2rem;
  font-family: var(--font-body);
}

@media (max-width: 768px) {
  .paper-grid {
    grid-template-columns: 1fr;
  }
  .research-gallery {
    grid-template-columns: 1fr;
  }
  .research-gallery-item img {
    height: 220px;
  }
}

@media (max-width: 480px) {
  .paper-card {
    padding: 1.25rem;
  }
  .research-gallery-item img {
    height: 180px;
  }
}

/* ----- Image Sections ----- */
.section-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin: 2rem 0;
  max-height: 360px;
}

.section-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ----- Footer ----- */
.footer {
  background: var(--lab-dark);
  padding: 3rem 0 2rem;
  color: rgba(255, 255, 255, 0.6);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.footer-brand h3 {
  color: var(--lab-white);
  font-size: 1.2rem;
  margin-bottom: 0.25rem;
}

.footer-brand p {
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.5);
  margin: 0;
}

.footer-nav {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.footer-nav a {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--transition);
}

.footer-nav a:hover {
  color: var(--lab-white);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-disclaimer {
  font-size: 0.78rem;
  max-width: 600px;
  line-height: 1.5;
}

.footer-copy {
  font-size: 0.78rem;
}

/* ----- Page Header (inner pages) ----- */
.page-header {
  padding: calc(var(--nav-height) + 3rem) 0 2.5rem;
  background: var(--lab-bone);
}

.page-header h1 {
  margin-bottom: 0.75rem;
}

.page-header p {
  color: var(--lab-slate);
  font-size: 1.05rem;
  max-width: 640px;
}

/* ----- Animations ----- */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ----- Responsive: Tablet (768px) ----- */
@media (max-width: 768px) {
  .nav-links,
  .nav-cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--lab-white);
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--lab-border);
    box-shadow: var(--shadow-md);
    gap: 0;
  }

  .nav-links.open a {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--lab-border);
    width: 100%;
  }

  .nav-links.open .nav-cta-mobile {
    display: block;
    margin-top: 0.5rem;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

  .two-col {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .workflow-steps {
    grid-template-columns: 1fr 1fr;
  }

  .workflow-step::after {
    display: none;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .about-bullets {
    grid-template-columns: 1fr;
  }

  .credibility-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-content {
    flex-direction: column;
  }
}

/* ----- Responsive: Mobile (480px) ----- */
@media (max-width: 480px) {
  h1 { font-size: 1.9rem; }
  h2 { font-size: 1.55rem; }

  .hero {
    padding: calc(var(--nav-height) + 2.5rem) 0 2.5rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .hero-cta .btn {
    width: 100%;
    max-width: 280px;
  }

  .buyer-tags {
    gap: 0.5rem;
  }

  .buyer-tag {
    font-size: 0.75rem;
    padding: 0.35rem 0.9rem;
  }

  .section {
    padding: 3.5rem 0;
  }

  .workflow-steps {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .topics-grid {
    grid-template-columns: 1fr;
  }

  .report-includes {
    grid-template-columns: 1fr;
  }

  .methods-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}