/* ============================================================
   Eric Litvin — Authority Site
   Design: Premium / Corporate-Editorial / Dark-Accented
   ============================================================ */

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

:root {
  --navy:      #0a0f1e;
  --navy-mid:  #111827;
  --navy-card: #161d2e;
  --blue:      #2563EB;
  --blue-light:#3b82f6;
  --blue-glow: rgba(37, 99, 235, 0.15);
  --white:     #f8fafc;
  --muted:     #94a3b8;
  --border:    rgba(255,255,255,0.07);
  --light-bg:  #f8fafc;
  --dark-text: #0d1117;
  --body-font: 'Inter', system-ui, -apple-system, sans-serif;
  --mono-font: 'IBM Plex Mono', 'Courier New', monospace;
  --max-w:     1140px;
  --radius:    8px;
}

html { scroll-behavior: smooth; }

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

img { display: block; max-width: 100%; }
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- Typography --- */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

/* --- Layout --- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 96px 0; }
section.compact { padding: 64px 0; }

/* --- NAV --- */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(10, 15, 30, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.nav-logo {
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
  letter-spacing: 0.01em;
}
.nav-logo span { color: var(--blue-light); }

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}
.nav-links a {
  color: var(--muted);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  transition: color 0.2s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--white); text-decoration: none; }

.nav-cta {
  background: var(--blue);
  color: var(--white) !important;
  padding: 8px 20px;
  border-radius: var(--radius);
  font-size: 13px !important;
  transition: background 0.2s !important;
}
.nav-cta:hover { background: var(--blue-light) !important; }

.nav-toggle { display: none; }

/* --- HERO (Dark) --- */
.hero {
  background: var(--navy);
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 64px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -20%;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(37,99,235,0.12) 0%, transparent 65%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(37,99,235,0.07) 0%, transparent 65%);
  pointer-events: none;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  padding: 80px 24px;
  max-width: var(--max-w);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  font-family: var(--mono-font);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--blue-light);
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(40px, 5vw, 64px);
  color: var(--white);
  margin-bottom: 16px;
}

.hero-title-sub {
  font-size: clamp(18px, 2.5vw, 24px);
  font-weight: 400;
  color: var(--muted);
  margin-bottom: 32px;
  line-height: 1.4;
}

.hero-summary {
  font-size: 16px;
  color: rgba(248,250,252,0.75);
  line-height: 1.75;
  max-width: 520px;
  margin-bottom: 48px;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--blue);
  color: var(--white);
  padding: 14px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.01em;
  transition: background 0.2s, transform 0.15s;
}
.btn-primary:hover { background: var(--blue-light); text-decoration: none; transform: translateY(-1px); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--muted);
  padding: 14px 28px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.01em;
  transition: border-color 0.2s, color 0.2s;
}
.btn-ghost:hover { border-color: rgba(255,255,255,0.25); color: var(--white); text-decoration: none; }

/* Hero image / portrait block */
.hero-portrait {
  display: flex;
  justify-content: center;
  align-items: center;
}

.portrait-frame {
  width: 340px;
  height: 420px;
  border-radius: 12px;
  background: var(--navy-card);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.portrait-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 12px;
}

.portrait-placeholder {
  text-align: center;
  color: var(--muted);
}

.portrait-placeholder .icon {
  width: 80px;
  height: 80px;
  background: rgba(37,99,235,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 32px;
}

.portrait-placeholder p {
  font-size: 12px;
  font-family: var(--mono-font);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.5;
}

.portrait-badge {
  position: absolute;
  bottom: 20px;
  left: 20px;
  right: 20px;
  background: rgba(10,15,30,0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
}

.portrait-badge .name {
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 2px;
}

.portrait-badge .role {
  font-size: 12px;
  color: var(--blue-light);
  font-family: var(--mono-font);
}

/* --- STAT BAR --- */
.stat-bar {
  background: var(--navy-mid);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 32px 0;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.stat-item {
  text-align: center;
  padding: 0 24px;
  position: relative;
}

.stat-item + .stat-item::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 1px;
  background: var(--border);
}

.stat-number {
  font-size: 36px;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 6px;
}

.stat-number span { color: var(--blue-light); }

.stat-label {
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* --- SECTION LABELS --- */
.section-label {
  font-family: var(--mono-font);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(28px, 4vw, 42px);
  color: var(--dark-text);
  margin-bottom: 16px;
}

.section-title.light { color: var(--white); }

.section-desc {
  font-size: 17px;
  color: #475569;
  max-width: 600px;
  line-height: 1.7;
}

.section-desc.light { color: var(--muted); }

/* --- KEY HIGHLIGHTS --- */
.highlights-section { background: var(--light-bg); }

.highlights-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 56px;
}

.highlight-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 32px;
  position: relative;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.highlight-card:hover {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.06);
}

.highlight-icon {
  width: 44px;
  height: 44px;
  background: rgba(37,99,235,0.08);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  font-size: 20px;
}

.highlight-card h3 {
  font-size: 17px;
  margin-bottom: 10px;
  color: var(--dark-text);
}

.highlight-card p {
  font-size: 14.5px;
  color: #64748b;
  line-height: 1.65;
}

/* --- FEATURED REFERENCES --- */
.refs-section { background: var(--navy); }

.refs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 56px;
}

.ref-card {
  background: var(--navy-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 28px;
  display: flex;
  align-items: flex-start;
  gap: 20px;
  transition: border-color 0.2s;
  text-decoration: none;
}

.ref-card:hover {
  border-color: rgba(37,99,235,0.5);
  text-decoration: none;
}

.ref-icon {
  font-size: 24px;
  flex-shrink: 0;
  margin-top: 2px;
}

.ref-type {
  font-family: var(--mono-font);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--blue-light);
  margin-bottom: 4px;
}

.ref-title {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 4px;
  line-height: 1.4;
}

.ref-source {
  font-size: 12.5px;
  color: var(--muted);
}

/* --- LUMA OPTICS STRIP --- */
.luma-strip {
  background: var(--navy-mid);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 80px 0;
}

.luma-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.luma-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(37,99,235,0.1);
  border: 1px solid rgba(37,99,235,0.25);
  border-radius: 100px;
  padding: 6px 16px 6px 8px;
  margin-bottom: 24px;
}

.luma-dot {
  width: 8px;
  height: 8px;
  background: var(--blue);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}

.luma-badge span {
  font-size: 12px;
  font-weight: 600;
  color: var(--blue-light);
  letter-spacing: 0.05em;
}

.luma-facts {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.luma-fact {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.luma-fact-icon { font-size: 18px; margin-top: 1px; flex-shrink: 0; }

.luma-fact-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 2px;
}

.luma-fact-desc {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

/* --- CTA SECTION --- */
.cta-section {
  background: var(--light-bg);
  text-align: center;
}

.cta-inner {
  max-width: 640px;
  margin: 0 auto;
}

.cta-section h2 { margin-bottom: 16px; }
.cta-section p { color: #475569; margin-bottom: 36px; font-size: 17px; }

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* --- ABOUT PAGE --- */
.about-hero {
  background: var(--navy);
  padding: 140px 0 80px;
}

.about-grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 80px;
  align-items: start;
}

.about-sidebar .portrait-frame {
  width: 100%;
  height: 360px;
  margin-bottom: 24px;
}

.about-sidebar-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--muted);
  font-size: 13px;
  transition: border-color 0.2s, color 0.2s;
}

.sidebar-link:hover {
  border-color: rgba(37,99,235,0.4);
  color: var(--white);
  text-decoration: none;
}

.about-content h1 {
  font-size: clamp(36px, 5vw, 52px);
  color: var(--white);
  margin-bottom: 8px;
}

.about-content .title-role {
  font-size: 18px;
  color: var(--blue-light);
  font-family: var(--mono-font);
  margin-bottom: 32px;
}

.about-content .bio {
  font-size: 17px;
  color: rgba(248,250,252,0.78);
  line-height: 1.8;
  margin-bottom: 24px;
}

.impact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 48px;
}

.impact-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}

.impact-card h4 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--blue-light);
  font-family: var(--mono-font);
  margin-bottom: 8px;
}

.impact-card p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
}

/* Career section on About */
.career-section { background: var(--light-bg); }

.career-items {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 48px;
  position: relative;
}

.career-items::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0; bottom: 0;
  width: 1px;
  background: #e2e8f0;
}

.career-item {
  display: flex;
  gap: 32px;
  padding: 0 0 40px 56px;
  position: relative;
}

.career-item::before {
  content: '';
  position: absolute;
  left: 13px;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid #cbd5e1;
}

.career-item.highlight::before {
  background: var(--blue);
  border-color: var(--blue);
}

.career-date {
  font-family: var(--mono-font);
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  padding-top: 4px;
  min-width: 90px;
}

.career-content h3 { font-size: 16px; margin-bottom: 4px; }
.career-content .org { font-size: 14px; color: var(--blue); margin-bottom: 6px; }
.career-content p { font-size: 14px; color: #64748b; line-height: 1.6; }

/* --- TIMELINE PAGE --- */
.timeline-hero {
  background: var(--navy);
  padding: 140px 0 80px;
  text-align: center;
}

.timeline-section { background: var(--light-bg); }

.timeline-wrapper {
  max-width: 760px;
  margin: 64px auto 0;
  position: relative;
}

.timeline-wrapper::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0; bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--blue), #e2e8f0);
}

.tl-item {
  display: flex;
  gap: 40px;
  padding: 0 0 64px 48px;
  position: relative;
}

.tl-dot {
  position: absolute;
  left: -9px;
  top: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--white);
  border: 2px solid #cbd5e1;
  flex-shrink: 0;
}

.tl-item.major .tl-dot {
  background: var(--blue);
  border-color: var(--blue);
  box-shadow: 0 0 0 4px rgba(37,99,235,0.15);
}

.tl-year {
  font-family: var(--mono-font);
  font-size: 13px;
  font-weight: 600;
  color: var(--blue);
  min-width: 55px;
  padding-top: 2px;
}

.tl-content {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 24px;
  flex: 1;
  transition: border-color 0.2s;
}

.tl-content:hover { border-color: var(--blue); }

.tl-tag {
  font-family: var(--mono-font);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 8px;
  padding: 3px 10px;
  background: rgba(37,99,235,0.07);
  border-radius: 100px;
  display: inline-block;
}

.tl-content h3 {
  font-size: 17px;
  margin-bottom: 8px;
  color: var(--dark-text);
}

.tl-content p {
  font-size: 14.5px;
  color: #475569;
  line-height: 1.65;
  margin-bottom: 12px;
}

.tl-source {
  font-size: 12px;
  color: var(--muted);
}

.tl-source a {
  color: var(--blue);
  font-size: 12px;
}

/* --- REFERENCES PAGE --- */
.refs-hero {
  background: var(--navy);
  padding: 140px 0 80px;
  text-align: center;
}

.refs-page-section { background: var(--light-bg); }

.refs-category { margin-bottom: 64px; }

.refs-category-label {
  font-family: var(--mono-font);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 8px;
}

.refs-category h2 {
  font-size: 24px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid #e2e8f0;
}

.refs-list { display: flex; flex-direction: column; gap: 12px; }

.ref-row {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 20px 24px;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  text-decoration: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.ref-row:hover {
  border-color: var(--blue);
  box-shadow: 0 0 0 2px rgba(37,99,235,0.06);
  text-decoration: none;
}

.ref-row-icon { font-size: 22px; flex-shrink: 0; margin-top: 2px; }

.ref-row-body { flex: 1; }

.ref-row-type {
  font-family: var(--mono-font);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 4px;
}

.ref-row-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--dark-text);
  margin-bottom: 3px;
  line-height: 1.4;
}

.ref-row-desc {
  font-size: 13px;
  color: #64748b;
  line-height: 1.5;
}

.ref-row-arrow {
  color: var(--muted);
  font-size: 18px;
  margin-top: 4px;
  flex-shrink: 0;
  transition: color 0.2s, transform 0.2s;
}

.ref-row:hover .ref-row-arrow {
  color: var(--blue);
  transform: translateX(3px);
}

/* --- LUMA OPTICS PAGE --- */
.luma-hero {
  background: var(--navy);
  padding: 140px 0 80px;
}

.luma-hero-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 60px;
  align-items: center;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.luma-metrics {
  background: var(--light-bg);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 56px;
}

.metric-card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 28px 24px;
  text-align: center;
}

.metric-number {
  font-size: 36px;
  font-weight: 800;
  color: var(--dark-text);
  letter-spacing: -0.03em;
  margin-bottom: 6px;
}

.metric-number span { color: var(--blue); }

.metric-label {
  font-size: 13px;
  color: #64748b;
  line-height: 1.4;
}

.tech-section { background: var(--navy-mid); }

.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 56px;
}

.tech-card {
  background: var(--navy-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
}

.tech-card-icon {
  font-size: 28px;
  margin-bottom: 16px;
}

.tech-card h3 {
  font-size: 16px;
  color: var(--white);
  margin-bottom: 10px;
}

.tech-card p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.65;
}

/* --- FOOTER --- */
.site-footer {
  background: var(--navy);
  border-top: 1px solid var(--border);
  padding: 56px 0 32px;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

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

.footer-brand .brand-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}

.footer-brand .brand-sub {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.65;
  max-width: 260px;
}

.footer-nav h4 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-bottom: 16px;
  font-family: var(--mono-font);
}

.footer-nav ul { list-style: none; }
.footer-nav ul li { margin-bottom: 10px; }
.footer-nav ul a { color: rgba(255,255,255,0.55); font-size: 14px; transition: color 0.2s; }
.footer-nav ul a:hover { color: var(--white); text-decoration: none; }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-bottom p {
  font-size: 12.5px;
  color: var(--muted);
}

.footer-schema-note {
  font-family: var(--mono-font);
  font-size: 11px;
  color: rgba(148,163,184,0.4);
  letter-spacing: 0.05em;
}

/* --- UTILITIES --- */
.dark-section { background: var(--navy); }
.mid-section { background: var(--navy-mid); }

.tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(37,99,235,0.08);
  border: 1px solid rgba(37,99,235,0.2);
  border-radius: 100px;
  font-size: 12px;
  font-weight: 500;
  color: var(--blue);
  letter-spacing: 0.02em;
}

.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-48 { margin-top: 48px; }

/* --- RESPONSIVE --- */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-portrait { display: none; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .stat-item + .stat-item::before { display: none; }
  .highlights-grid { grid-template-columns: 1fr 1fr; }
  .refs-grid { grid-template-columns: 1fr; }
  .luma-inner { grid-template-columns: 1fr; gap: 40px; }
  .about-grid { grid-template-columns: 1fr; }
  .about-sidebar { display: none; }
  .impact-grid { grid-template-columns: 1fr; }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .tech-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 32px; }
  .luma-hero-inner { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  section { padding: 64px 0; }
  .highlights-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .nav-links.open { display: flex; flex-direction: column; position: fixed; top: 64px; left: 0; right: 0; background: var(--navy); padding: 24px; gap: 16px; border-bottom: 1px solid var(--border); }
  .nav-toggle { display: block; background: none; border: 1px solid var(--border); color: var(--white); padding: 6px 12px; border-radius: 6px; cursor: pointer; font-size: 16px; }
  .tl-item { flex-direction: column; gap: 8px; }
  .hero-actions { flex-direction: column; }
  .metrics-grid { grid-template-columns: 1fr 1fr; }
}