/* ─────────────────────────────────────────────────────────────────────────
   REVEDEON.COM — Styles
   Color system matches ergosherpa.com. To tweak brand colors, edit the
   :root variables below — everything else updates automatically.
   ───────────────────────────────────────────────────────────────────────── */

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

/* ── Design Tokens ────────────────────────────────────────────────────── */
:root {
  /* Brand colors — same as ErgoSherpa app */
  --navy:        #1e3a5f;
  --navy-dark:   #152d4a;
  --navy-light:  #2a4f7c;
  --teal:        #0d9488;
  --teal-light:  #14b8a8;
  --teal-bg:     #f0fdfa;

  /* Grays */
  --gray-50:     #f9fafb;
  --gray-100:    #f3f4f6;
  --gray-200:    #e5e7eb;
  --gray-500:    #6b7280;
  --gray-600:    #4b5563;
  --gray-800:    #1f2937;
  --white:       #ffffff;

  /* Typography */
  --font: 'Inter', system-ui, -apple-system, sans-serif;

  /* Shape & shadow */
  --radius-sm:   8px;
  --radius:      12px;
  --radius-lg:   16px;
  --shadow-sm:   0 2px 4px rgba(0,0,0,.06);
  --shadow:      0 4px 12px rgba(0,0,0,.08);
  --shadow-lg:   0 20px 40px rgba(0,0,0,.12);
  --transition:  all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Base ─────────────────────────────────────────────────────────────── */
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  line-height: 1.7;
  color: var(--gray-800);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 100px 0; }

.section-title {
  font-size: 2.75rem;
  font-weight: 700;
  color: var(--navy);
  text-align: center;
  margin-bottom: 60px;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

/* ── Navigation ───────────────────────────────────────────────────────── */
.navbar {
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  transition: var(--transition);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 24px;
}

.nav-brand {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--navy);
  letter-spacing: 0.06em;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 36px;
}

.nav-menu a {
  color: var(--gray-800);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 2px;
  background: var(--teal);
  transition: var(--transition);
}

.nav-menu a:hover { color: var(--teal); }
.nav-menu a:hover::after { width: 100%; }

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.mobile-menu-toggle span {
  width: 25px; height: 2px;
  background: var(--navy);
  margin: 4px 0;
  transition: var(--transition);
  border-radius: 2px;
  display: block;
}

/* ── Hero ─────────────────────────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 50%, var(--navy-light) 100%);
  color: var(--white);
  padding: 180px 0 120px;
  margin-top: 70px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 50%, rgba(13,148,136,.15) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: 4rem;
  font-weight: 800;
  margin-bottom: 24px;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.hero-subtitle {
  font-size: 1.3rem;
  margin-bottom: 48px;
  opacity: 0.9;
  line-height: 1.7;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Buttons ──────────────────────────────────────────────────────────── */
.btn {
  padding: 14px 32px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
  display: inline-block;
  letter-spacing: 0.01em;
}

/* Primary: white bg with navy text — used on dark (hero, cta-section) */
.btn-primary {
  background: var(--white);
  color: var(--navy);
  box-shadow: var(--shadow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Secondary: teal bg — used on light sections */
.btn-secondary {
  background: var(--teal);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(13,148,136,.3);
}
.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(13,148,136,.4);
}

/* Ghost: outline — used on light sections */
.btn-ghost {
  background: transparent;
  color: var(--navy);
  border: 1.5px solid var(--gray-200);
}
.btn-ghost:hover {
  background: var(--gray-50);
  transform: translateY(-1px);
}

/* White: same as primary, explicit for dark backgrounds */
.btn-white {
  background: var(--white);
  color: var(--navy);
  box-shadow: var(--shadow);
}
.btn-white:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-large { font-size: 1rem; padding: 16px 40px; }

/* ── Product Section ──────────────────────────────────────────────────── */
.product-section { background: var(--white); }

.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
  margin-bottom: 100px;
}

.problem-card {
  background: var(--white);
  padding: 44px 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.problem-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--teal);
}

.problem-icon { font-size: 3rem; margin-bottom: 20px; }

.problem-card h3 {
  font-size: 1.4rem;
  color: var(--navy);
  margin-bottom: 14px;
  font-weight: 700;
}

.problem-card p { color: var(--gray-500); font-size: 1.02rem; }

/* Solution */
.solution-section { margin-top: 80px; }

.solution-content { max-width: 1000px; margin: 40px auto 0; }

.solution-text-full h3 {
  font-size: 2.2rem;
  color: var(--navy);
  margin-bottom: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-align: center;
}

.solution-lead {
  color: var(--gray-500);
  margin-bottom: 56px;
  font-size: 1.15rem;
  line-height: 1.8;
  text-align: center;
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 40px;
}

.feature-item {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 28px;
  background: var(--teal-bg);
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}

.feature-item:hover { transform: translateX(4px); box-shadow: var(--shadow); }

.feature-icon {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--teal);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
  font-size: 1rem;
}

.feature-content h4 {
  font-size: 1.1rem;
  color: var(--navy);
  margin-bottom: 6px;
  font-weight: 600;
}

.feature-content p { color: var(--gray-500); font-size: 0.93rem; }

/* Video */
.video-section { margin-top: 100px; }

.video-description {
  text-align: center;
  font-size: 1.1rem;
  color: var(--gray-500);
  margin-bottom: 40px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.video-container {
  max-width: 1000px;
  margin: 0 auto;
  background: var(--navy-dark);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.video-container video { width: 100%; height: auto; display: block; }

/* ── Technology Section ───────────────────────────────────────────────── */
.technology-section { background: var(--gray-50); }

.tech-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
  margin-bottom: 80px;
}

.tech-card {
  padding: 36px;
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

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

.tech-card h3 {
  font-size: 1.45rem;
  color: var(--navy);
  margin-bottom: 14px;
  font-weight: 700;
}

.tech-card p { color: var(--gray-500); line-height: 1.8; }

.comparison-section {
  background: var(--white);
  padding: 56px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}

.comparison-section h3 {
  font-size: 2rem;
  color: var(--navy);
  text-align: center;
  margin-bottom: 44px;
  font-weight: 700;
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.comparison-item {
  background: var(--gray-50);
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}

.comparison-item:hover { transform: translateY(-3px); box-shadow: var(--shadow); }

.comparison-item h4 {
  font-size: 1.25rem;
  color: var(--navy);
  margin-bottom: 20px;
  font-weight: 700;
}

.comparison-item ul { list-style: none; }

.comparison-item li {
  padding: 10px 0;
  padding-left: 28px;
  position: relative;
  color: var(--gray-800);
  font-size: 0.97rem;
}

.comparison-item li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--teal);
  font-weight: 700;
}

/* ── Market Section ───────────────────────────────────────────────────── */
.market-section { background: var(--white); }

.market-overview {
  text-align: center;
  max-width: 860px;
  margin: 0 auto 80px;
}

.market-overview h3 {
  font-size: 2rem;
  color: var(--navy);
  margin-bottom: 20px;
  font-weight: 700;
}

.market-overview p { font-size: 1.1rem; color: var(--gray-500); line-height: 1.8; }

.market-segments { margin-bottom: 80px; }

.market-segments h3 {
  font-size: 2rem;
  color: var(--navy);
  text-align: center;
  margin-bottom: 44px;
  font-weight: 700;
}

.segment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}

.segment-card {
  background: var(--gray-50);
  padding: 36px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.segment-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--teal);
}

.segment-card h4 {
  font-size: 1.25rem;
  color: var(--navy);
  margin-bottom: 14px;
  font-weight: 700;
}

.segment-card p { color: var(--gray-500); line-height: 1.7; }

.market-drivers { margin-bottom: 80px; }

.market-drivers h3 {
  font-size: 2rem;
  color: var(--navy);
  text-align: center;
  margin-bottom: 48px;
  font-weight: 700;
}

.drivers-content { max-width: 900px; margin: 0 auto; }

.driver-item {
  display: flex;
  gap: 28px;
  align-items: flex-start;
  margin-bottom: 28px;
  padding: 32px;
  background: var(--gray-50);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}

.driver-item:hover { box-shadow: var(--shadow); border-color: var(--teal); }

.driver-number {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--teal);
  min-width: 72px;
  opacity: 0.35;
  line-height: 1;
}

.driver-text h4 {
  font-size: 1.45rem;
  color: var(--navy);
  margin-bottom: 10px;
  font-weight: 700;
}

.driver-text p { color: var(--gray-500); line-height: 1.8; }

.strategic-section {
  background: var(--gray-50);
  padding: 64px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
}

.strategic-section h3 {
  font-size: 2rem;
  color: var(--navy);
  text-align: center;
  margin-bottom: 20px;
  font-weight: 700;
}

.strategic-intro {
  text-align: center;
  font-size: 1.1rem;
  color: var(--gray-500);
  margin-bottom: 52px;
  max-width: 760px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.8;
}

.milestone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.milestone-card {
  text-align: center;
  padding: 36px 28px;
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

.milestone-card:hover {
  border-color: var(--teal);
  box-shadow: var(--shadow-lg);
  transform: translateY(-5px);
}

.milestone-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px; height: 60px;
  border-radius: 50%;
  background: var(--teal);
  color: var(--white);
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 20px;
}

.milestone-card h4 {
  font-size: 1.2rem;
  color: var(--navy);
  margin-bottom: 12px;
  font-weight: 700;
}

.milestone-card p { color: var(--gray-500); line-height: 1.7; }

/* ── Founder Section ──────────────────────────────────────────────────── */
.founder-section { background: var(--gray-50); }

.founder-content {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 64px;
  align-items: start;
  max-width: 1100px;
  margin: 0 auto;
}

.founder-image img {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.founder-bio h3 {
  font-size: 2.2rem;
  color: var(--navy);
  margin-bottom: 10px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.founder-title {
  font-size: 1.1rem;
  color: var(--teal);
  font-weight: 600;
  margin-bottom: 20px !important;
}

.founder-bio > p {
  font-size: 1.08rem;
  color: var(--gray-500);
  line-height: 1.8;
  margin-bottom: 28px;
}

.credentials {
  background: var(--white);
  padding: 32px;
  border-radius: var(--radius-lg);
  margin-bottom: 28px;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}

.credentials h4 {
  font-size: 1.3rem;
  color: var(--navy);
  margin-bottom: 20px;
  font-weight: 700;
}

.credentials-list { list-style: none; }

.credentials-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-800);
  font-size: 1rem;
}

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

.credentials-list strong {
  color: var(--navy);
  display: inline-block;
  min-width: 220px;
  font-weight: 600;
}

.founder-vision {
  padding: 32px;
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  border-left: 4px solid var(--teal);
  margin-bottom: 28px;
  box-shadow: var(--shadow-sm);
}

.founder-vision h4 {
  font-size: 1.3rem;
  color: var(--navy);
  margin-bottom: 14px;
  font-weight: 700;
}

.founder-vision p {
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: 14px;
  font-size: 1rem;
}

.founder-vision p:last-child { margin-bottom: 0; }

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

.founder-link {
  display: inline-flex;
  align-items: center;
  color: var(--navy);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color .15s;
}

.founder-link::before {
  content: "→";
  margin-right: 8px;
  color: var(--teal);
  font-weight: 700;
}

.founder-link:hover { color: var(--teal); }

/* ── Patent Section ───────────────────────────────────────────────────── */
.patent-section { background: var(--white); }

.patent-info {
  background: var(--gray-50);
  padding: 44px;
  border-radius: var(--radius-lg);
  margin-bottom: 44px;
  border: 1px solid var(--gray-200);
  box-shadow: var(--shadow-sm);
}

.patent-details h3 {
  font-size: 2rem;
  color: var(--navy);
  margin-bottom: 20px;
  font-weight: 700;
}

.patent-details p {
  margin-bottom: 10px;
  color: var(--gray-800);
  line-height: 1.8;
  font-size: 1rem;
}

.patent-details strong { color: var(--navy); font-weight: 600; }

.patent-description { margin-top: 20px !important; color: var(--gray-500) !important; }

.patent-viewer {
  width: 100%;
  height: 800px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--white);
  box-shadow: var(--shadow-lg);
}

.patent-viewer iframe { width: 100%; height: 100%; border: none; }

/* ── CTA / Partner Section (dark) ─────────────────────────────────────── */
.cta-section {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  padding: 96px 0;
}

.cta-header {
  text-align: center;
  margin-bottom: 56px;
}

.cta-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.cta-sub {
  font-size: 1.08rem;
  color: rgba(255,255,255,.72);
  max-width: 680px;
  margin: 0 auto;
  line-height: 1.75;
}

.cta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  max-width: 860px;
  margin: 0 auto;
}

.cta-card {
  background: rgba(255,255,255,.07);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  color: var(--white);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.cta-card--primary { background: rgba(255,255,255,.13); }

.cta-card-icon {
  width: 60px;
  height: 60px;
  border-radius: 14px;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.18);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.cta-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 14px;
}

.cta-card p {
  font-size: 0.96rem;
  opacity: 0.74;
  line-height: 1.7;
  margin-bottom: 28px;
  flex: 1;
}

/* ── Footer ───────────────────────────────────────────────────────────── */
.footer {
  background: var(--navy-dark);
  color: var(--white);
  padding: 64px 0 32px;
}

.footer-content {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 64px;
  margin-bottom: 44px;
}

.footer-brand h3 {
  font-size: 1.8rem;
  margin-bottom: 14px;
  letter-spacing: 0.06em;
  font-weight: 800;
}

.footer-brand p { opacity: 0.7; line-height: 1.7; font-size: 1rem; }

.footer-links { display: flex; gap: 64px; }

.footer-column h4 {
  font-size: 1.1rem;
  margin-bottom: 20px;
  font-weight: 700;
}

.footer-column ul { list-style: none; }
.footer-column li { margin-bottom: 12px; }

.footer-column a {
  color: var(--white);
  opacity: 0.7;
  transition: var(--transition);
  font-size: 0.97rem;
}

.footer-column a:hover { opacity: 1; padding-left: 4px; }

.footer-bottom {
  text-align: center;
  padding-top: 28px;
  border-top: 1px solid rgba(255,255,255,.1);
  opacity: 0.55;
  font-size: 0.88rem;
}

/* ── Responsive ───────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .founder-content { grid-template-columns: 1fr; gap: 44px; }
  .founder-image { max-width: 360px; margin: 0 auto; }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 68px; left: 0; right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 20px 24px;
    box-shadow: var(--shadow);
    gap: 4px;
  }
  .nav-menu.active { display: flex; }
  .nav-menu a { padding: 10px 0; }
  .mobile-menu-toggle { display: flex; }

  .hero { padding: 140px 0 80px; }
  .hero-title { font-size: 2.6rem; }
  .hero-subtitle { font-size: 1.1rem; }

  .section { padding: 72px 0; }
  .section-title { font-size: 2.1rem; }

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

  .driver-item { flex-direction: column; gap: 12px; padding: 24px; }
  .driver-number { min-width: auto; }

  .footer-content { grid-template-columns: 1fr; gap: 36px; }
  .footer-links { flex-direction: column; gap: 32px; }

  .patent-viewer { height: 500px; }

  .comparison-section { padding: 36px 24px; }
  .strategic-section { padding: 44px 28px; }

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

@media (max-width: 480px) {
  .hero-title { font-size: 2.1rem; }
  .hero-cta { flex-direction: column; align-items: center; }
  .hero-cta .btn { width: 100%; max-width: 300px; text-align: center; }
  .section { padding: 56px 0; }
  .section-title { font-size: 1.8rem; }
  .patent-info { padding: 28px 20px; }
}

/* ── Scroll animations ────────────────────────────────────────────────── */
.problem-card,
.tech-card,
.segment-card,
.milestone-card {
  animation: fadeInUp 0.5s ease-out both;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}