/* Green AI Institute — Layered Tech Design System */
:root {
  --color-bg: #f5f7f6;
  --color-bg-alt: #e8ecea;
  --color-bg-deep: #0d1512;
  --color-forest: #1a3c34;
  --color-forest-light: #2d5a4e;
  --color-sage: #5c7c6a;
  --color-sage-light: #8fa89a;
  --color-accent: #3d6b5a;
  --color-tech: #00c9a7;
  --color-tech-dim: rgba(0, 201, 167, 0.15);
  --color-cream: #e8e6e1;
  --color-text: #1a2520;
  --color-text-muted: #4a5a54;
  --color-border: rgba(26, 60, 52, 0.12);
  --shadow-sm: 0 2px 8px rgba(26, 60, 52, 0.06);
  --shadow-md: 0 8px 32px rgba(26, 60, 52, 0.1);
  --shadow-lg: 0 16px 48px rgba(26, 60, 52, 0.12);
  --shadow-glow: 0 0 40px rgba(0, 201, 167, 0.12);
  --font-display: 'Sora', 'Cormorant Garamond', sans-serif;
  --font-body: 'Outfit', -apple-system, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --radius: 10px;
  --radius-lg: 20px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a:hover {
  color: var(--color-sage);
}

/* Header — Glassmorphism */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.25rem 2rem;
  background: rgba(245, 247, 246, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(26, 60, 52, 0.08);
  box-shadow: 0 1px 0 rgba(255,255,255,0.6) inset;
  transition: var(--transition);
}

.nav {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-forest);
  white-space: nowrap;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.25rem;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
}

.nav-links li {
  white-space: nowrap;
}

.nav-links a {
  font-weight: 500;
  font-size: 0.9rem;
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-forest);
}

/* Hero — Layered depth + tech grid */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  padding: 8rem 2rem 4rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 100% 80% at 50% -20%, var(--color-tech-dim) 0%, transparent 50%),
    radial-gradient(ellipse 80% 50% at 50% 0%, rgba(92, 124, 106, 0.2) 0%, transparent 55%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(61, 107, 90, 0.1) 0%, transparent 50%);
}

.hero-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.5;
  background-image: 
    linear-gradient(rgba(26, 60, 52, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26, 60, 52, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 20%, transparent 70%);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 720px;
  animation: hero-fade-in 1s ease-out;
}

@keyframes hero-fade-in {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 10vw, 6rem);
  font-weight: 600;
  line-height: 1.05;
  color: var(--color-forest);
  margin-bottom: 1.5rem;
  letter-spacing: -0.03em;
  text-shadow: 0 0 60px var(--color-tech-dim);
}

.title-line {
  display: block;
}

.hero-tagline {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  font-weight: 400;
  margin-bottom: 2.5rem;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.75rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-forest) 0%, var(--color-forest-light) 100%);
  color: white;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--color-forest-light) 0%, var(--color-sage) 100%);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: transparent;
  color: var(--color-forest);
  border: 2px solid var(--color-forest);
}

.btn-secondary:hover {
  background: var(--color-forest);
  color: white;
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

.scroll-indicator {
  width: 24px;
  height: 40px;
  border: 2px solid var(--color-sage-light);
  border-radius: 12px;
  position: relative;
}

.scroll-indicator::after {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--color-sage);
  border-radius: 2px;
  animation: scroll-bounce 2s infinite;
}

@keyframes scroll-bounce {
  0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
  50% { opacity: 0.5; transform: translateX(-50%) translateY(8px); }
}

/* Sections — Layered depth */
.section {
  padding: 5.5rem 2rem;
  position: relative;
}

.section::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(26, 60, 52, 0.08), transparent);
}

.section:nth-child(even) {
  background: linear-gradient(180deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
}

.section:nth-child(odd):not(.newsletter):not(.action-cta) {
  background: linear-gradient(180deg, var(--color-bg) 0%, rgba(255,255,255,0.5) 100%);
}

.container {
  max-width: 720px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 600;
  color: var(--color-forest);
  margin-bottom: 2rem;
  letter-spacing: -0.02em;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-tech), var(--color-sage));
  border-radius: 2px;
  margin-top: 0.75rem;
}

.content-block p {
  margin-bottom: 1.25rem;
  color: var(--color-text);
}

.content-block .lead {
  font-size: 1.15rem;
  color: var(--color-text-muted);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-weight: 600;
  margin-top: 1rem;
}

.link-arrow:hover {
  gap: 0.5rem;
}

.whitepaper-preview {
  margin-top: 2rem;
  padding: 1.75rem;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(26, 60, 52, 0.08);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.whitepaper-preview:hover {
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 201, 167, 0.2);
}

/* Summit card — Glass */
.summit-card {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  padding: 2rem;
  border: 1px solid rgba(26, 60, 52, 0.08);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.summit-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 201, 167, 0.2);
}

.summit-meta {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  font-weight: 600;
  color: var(--color-forest);
}

.summit-card p {
  margin-bottom: 1rem;
}

/* Newsletter — Layered gradient */
.newsletter {
  background: linear-gradient(180deg, var(--color-forest) 0%, #0f2a24 100%);
  color: white;
  position: relative;
}

.newsletter::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 50% at 50% 100%, rgba(0, 201, 167, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.newsletter .section-title {
  color: white;
}

.newsletter-desc {
  margin-bottom: 1.5rem;
  color: rgba(255,255,255,0.9);
}

.newsletter-form {
  display: flex;
  gap: 0.75rem;
  max-width: 480px;
}

.newsletter-form input {
  flex: 1;
  padding: 0.875rem 1.25rem;
  font-size: 1rem;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.1);
  color: white;
}

.newsletter-form input::placeholder {
  color: rgba(255,255,255,0.6);
}

.newsletter-form input:focus {
  outline: none;
  border-color: white;
}

.newsletter-form .btn-primary {
  background: white;
  color: var(--color-forest);
}

.newsletter-form .btn-primary:hover {
  background: var(--color-cream);
}

/* Footer */
.site-footer {
  padding: 3rem 2rem;
  background: var(--color-forest);
  color: white;
}

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

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.footer-tagline {
  opacity: 0.8;
  margin-bottom: 1.5rem;
}

.footer-nav {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
}

.footer-nav a {
  color: rgba(255,255,255,0.9);
}

.footer-nav a:hover {
  color: white;
}

/* Action CTA — Tech glow */
.action-cta {
  background: linear-gradient(180deg, var(--color-forest) 0%, #0f2a24 100%);
  color: white;
  padding: 4rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.action-cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse 60% 40% at 50% 0%, rgba(0, 201, 167, 0.15) 0%, transparent 50%),
    linear-gradient(rgba(0, 201, 167, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 201, 167, 0.03) 1px, transparent 1px);
  background-size: 100% 100%, 32px 32px, 32px 32px;
  pointer-events: none;
}

.action-cta h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  margin-bottom: 0.5rem;
  position: relative;
  z-index: 1;
}

.action-cta p {
  max-width: 560px;
  margin: 0 auto 1.75rem;
  opacity: 0.95;
  font-size: 1.05rem;
  position: relative;
  z-index: 1;
}

.action-cta-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  align-items: center;
  position: relative;
  z-index: 1;
}

.action-cta-buttons .btn {
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: transform 0.2s, box-shadow 0.2s;
}

.action-cta-buttons .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

.action-cta-buttons .btn-primary {
  background: white;
  color: var(--color-forest);
  border: none;
}

.action-cta-buttons .btn-secondary {
  background: transparent;
  color: white;
  border: 2px solid rgba(255,255,255,0.7);
}

.action-cta-buttons .btn-secondary:hover {
  border-color: white;
  background: rgba(255,255,255,0.1);
}

/* Footer CTA block */
.footer-cta {
  padding: 2rem 2rem 1.5rem;
  background: rgba(0,0,0,0.15);
  text-align: center;
}

.footer-cta p {
  font-size: 1rem;
  margin-bottom: 1rem;
  opacity: 0.95;
}

.footer-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.footer-cta-links a {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: rgba(255,255,255,0.15);
  color: white;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 0.9rem;
  transition: background 0.2s;
}

.footer-cta-links a:hover {
  background: rgba(255,255,255,0.25);
  color: white;
}

/* Page-specific: Summit */
.page-hero {
  padding: 10rem 2rem 4rem;
  text-align: center;
  background: linear-gradient(180deg, var(--color-bg-alt) 0%, var(--color-bg) 100%);
  position: relative;
}

.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: 
    linear-gradient(rgba(26, 60, 52, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26, 60, 52, 0.02) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4rem);
  color: var(--color-forest);
  margin-bottom: 0.5rem;
}

.page-hero .subtitle {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
}

.agenda-day {
  margin-bottom: 3rem;
}

.agenda-day h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-forest);
  margin-bottom: 0.5rem;
}

.agenda-day .location {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

.session-card {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(6px);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 0.75rem;
  border: 1px solid rgba(26, 60, 52, 0.08);
  box-shadow: var(--shadow-sm);
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  transition: var(--transition);
}

.session-card:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(0, 201, 167, 0.15);
}

.session-time {
  font-weight: 600;
  color: var(--color-sage);
  min-width: 100px;
}

.session-title {
  font-weight: 600;
  color: var(--color-forest);
}

/* Whitepaper chapter pages */
.page-hero.summit-hero-with-image {
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
  text-align: left;
  padding: 8rem 2rem 4rem;
}

.summit-hero-with-image .breadcrumb {
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.summit-hero-with-image .breadcrumb a:hover {
  text-decoration: underline;
}

.whitepaper-content {
  max-width: 720px;
  margin: 0 auto;
}

.whitepaper-content {
  font-size: 1.05rem;
  line-height: 1.8;
}

.whitepaper-content h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-forest);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-sage-light);
}

.whitepaper-content h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--color-forest-light);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.whitepaper-content p {
  margin-bottom: 1.25rem;
}

.whitepaper-content p:first-of-type {
  font-size: 1.1rem;
  color: var(--color-text-muted);
}

.whitepaper-content ul {
  margin: 1rem 0;
  padding-left: 1.75rem;
}

.whitepaper-content li {
  margin-bottom: 0.5rem;
}

.whitepaper-content strong {
  color: var(--color-forest);
}

.citation-block {
  background: linear-gradient(135deg, var(--color-bg-alt) 0%, rgba(232, 236, 234, 0.6) 100%);
  padding: 2rem;
  border-radius: var(--radius-lg);
  margin-top: 3rem;
  border: 1px solid rgba(26, 60, 52, 0.08);
  box-shadow: var(--shadow-sm);
}

.citation-block h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--color-forest);
  margin-bottom: 1rem;
}

.citation-block code {
  font-size: 0.8rem;
  background: rgba(26, 60, 52, 0.06);
  padding: 1rem;
  border-radius: var(--radius);
  display: block;
  white-space: pre-wrap;
  margin-top: 0.5rem;
  overflow-x: auto;
}

.citation-block a {
  font-weight: 500;
}

/* Volunteers */
.team-section {
  margin-bottom: 3rem;
}

.team-section h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--color-forest);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-sage-light);
}

.position-card {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(6px);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
  border: 1px solid rgba(26, 60, 52, 0.08);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.position-card:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(0, 201, 167, 0.15);
}

.position-card h4 {
  color: var(--color-forest);
  margin-bottom: 0.5rem;
}

.position-card ul {
  margin-left: 1.25rem;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* News & Impact */
.impact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.impact-card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(26, 60, 52, 0.08);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.impact-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: rgba(0, 201, 167, 0.2);
}

.impact-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--color-forest);
  margin-bottom: 0.75rem;
}

.impact-card p {
  flex: 1;
  margin-bottom: 1rem;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.impact-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-forest);
  background: linear-gradient(135deg, var(--color-tech-dim) 0%, var(--color-sage-light) 100%);
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  margin-bottom: 0.75rem;
  border: 1px solid rgba(0, 201, 167, 0.2);
}

.impact-quote {
  margin: 2rem 0;
  padding: 1.5rem 1.75rem;
  background: white;
  border-left: 4px solid var(--color-sage);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--color-text);
}

.impact-quote p {
  margin-bottom: 0.5rem;
}

.impact-quote cite {
  font-size: 0.9rem;
  font-style: normal;
  color: var(--color-text-muted);
}

/* Join Us */
.join-options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.join-card {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  padding: 2rem;
  border: 1px solid rgba(26, 60, 52, 0.08);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.join-card:hover {
  border-color: rgba(0, 201, 167, 0.2);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.join-card h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--color-forest);
  margin-bottom: 0.5rem;
}

.join-card p {
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

/* Speakers grid */
.speakers-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.speaker-card {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  border: 1px solid rgba(26, 60, 52, 0.08);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.speaker-card:hover {
  border-color: rgba(0, 201, 167, 0.2);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.speaker-placeholder {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--color-sage-light);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.speaker-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--color-forest);
  margin-bottom: 0.25rem;
}

.speaker-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.speakers-note {
  margin-top: 2rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* Section with image */
.section-with-image {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
}

.section-image {
  width: 100%;
  border-radius: var(--radius-lg);
  object-fit: cover;
  max-height: 360px;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(26, 60, 52, 0.06);
}

/* Video embed — responsive 16:9 */
.video-wrapper {
  position: relative;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--color-bg-deep);
}

.video-wrapper::before {
  content: '';
  display: block;
  padding-top: 56.25%; /* 16:9 */
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.video-wrapper-lg {
  max-width: 900px;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.video-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  background: var(--color-bg-deep);
}

.video-card-inner {
  position: relative;
  padding-top: 56.25%;
}

.video-card-inner iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

@media (max-width: 768px) {
  .section-with-image {
    grid-template-columns: 1fr;
  }
  .section-with-image .section-image {
    order: -1;
  }
}

/* Responsive — use hamburger menu when nav would wrap */
@media (max-width: 1200px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    max-width: 85vw;
    height: 100vh;
    background: white;
    flex-direction: column;
    flex-wrap: nowrap;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 5rem 1.5rem 2rem;
    box-shadow: -4px 0 24px rgba(0,0,0,0.1);
    transition: right var(--transition);
  }

  .nav-links li {
    border-bottom: 1px solid rgba(26, 60, 52, 0.08);
  }

  .nav-links a {
    display: block;
    padding: 0.75rem 0;
    font-size: 1rem;
  }

  .nav-links.active {
    right: 0;
  }

  .nav-toggle {
    display: flex;
    z-index: 101;
  }

  .newsletter-form {
    flex-direction: column;
  }

  .session-card {
    flex-direction: column;
    gap: 0.5rem;
  }

  .session-time {
    min-width: auto;
  }
}

/* Site Assistant (chat widget) */
#chat-assistant {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 999;
  font-family: var(--font-body);
}

#chat-assistant-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: var(--color-forest);
  color: white;
  border: none;
  border-radius: 2rem;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(26, 60, 52, 0.35);
  transition: transform 0.2s, box-shadow 0.2s;
}

#chat-assistant-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(26, 60, 52, 0.4);
}

#chat-assistant-panel {
  position: absolute;
  bottom: 3.5rem;
  right: 0;
  width: 360px;
  max-width: calc(100vw - 2rem);
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.15);
  border: 1px solid var(--color-border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  max-height: 480px;
}

#chat-assistant-panel[hidden] {
  display: none !important;
}

.chat-assistant-header {
  padding: 1rem 1.25rem;
  background: var(--color-forest);
  color: white;
  position: relative;
}

.chat-assistant-header h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 0.25rem;
}

.chat-assistant-header p {
  font-size: 0.8rem;
  opacity: 0.9;
}

#chat-assistant-close {
  position: absolute;
  top: 0.75rem;
  right: 1rem;
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
  opacity: 0.9;
}

#chat-assistant-close:hover {
  opacity: 1;
}

.chat-assistant-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  min-height: 120px;
  max-height: 280px;
}

.chat-assistant-msg {
  margin-bottom: 0.75rem;
}

.chat-assistant-msg-inner {
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  line-height: 1.5;
}

.chat-assistant-msg.user .chat-assistant-msg-inner {
  background: var(--color-forest);
  color: white;
  margin-left: 2rem;
}

.chat-assistant-msg.bot .chat-assistant-msg-inner {
  background: var(--color-bg-alt);
  color: var(--color-text);
}

.chat-assistant-msg-inner a {
  color: var(--color-forest);
  text-decoration: underline;
}

.chat-assistant-msg.user .chat-assistant-msg-inner a {
  color: rgba(255, 255, 255, 0.95);
}

.chat-assistant-input-wrap {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--color-border);
}

#chat-assistant-input {
  flex: 1;
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
}

#chat-assistant-send {
  padding: 0.6rem 1rem;
  background: var(--color-forest);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-size: 0.9rem;
  cursor: pointer;
}

.chat-assistant-suggestions {
  padding: 0.5rem 1rem 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.chat-assistant-suggestions button {
  padding: 0.35rem 0.65rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 1rem;
  font-size: 0.8rem;
  cursor: pointer;
  color: var(--color-forest);
}

.chat-assistant-suggestions button:hover {
  background: var(--color-cream);
}