/* ============================================
   Brainwave FHIR Link — Landing Page
   Clean, airy, no framework.
   ============================================ */

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

:root {
  --color-bg: #ffffff;
  --color-text: #1a1a2e;
  --color-text-secondary: #5a5a7a;
  --color-accent: #0f7b6c;
  --color-accent-light: #e8f5f2;
  --color-accent-hover: #0a5f53;
  --color-border: #e5e5ef;
  --color-card-bg: #f8f8fc;
  --color-badge-bg: #f0f0f8;
  --color-hero-bg: #fafafe;
  --font-stack: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, Helvetica, Arial, sans-serif;
  --max-width: 1200px;
  --section-gap: 100px;
  --radius: 10px;
  --transition: 0.2s ease;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

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

/* ---- NAV ---- */

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  height: 64px;
}

nav .container {
  display: flex;
  align-items: center;
  height: 100%;
  gap: 32px;
}

.nav-logo {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.nav-logo span {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
  flex: 1;
}

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: color var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lang-toggle {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: 4px 10px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  transition: all var(--transition);
}

.lang-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.nav-cta {
  display: inline-block;
  padding: 8px 20px;
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 8px;
  transition: background var(--transition);
}

.nav-cta:hover {
  background: var(--color-accent-hover);
}

.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-hamburger svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-text);
}

/* ---- SECTIONS ---- */

section {
  padding: var(--section-gap) 0;
}

section:first-of-type {
  padding-top: calc(64px + var(--section-gap));
}

.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 640px;
  line-height: 1.6;
}

/* ---- HERO ---- */

.hero {
  background: var(--color-hero-bg);
  text-align: center;
  padding: calc(64px + 80px) 0 100px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero .subline {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-secondary);
  margin-bottom: 40px;
  font-weight: 400;
}

.hero .subline strong {
  color: var(--color-text);
  font-weight: 600;
}

.hero-ctas {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-block;
  padding: 14px 32px;
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 10px;
  transition: background var(--transition), transform var(--transition);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-block;
  padding: 14px 32px;
  background: transparent;
  color: var(--color-text);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ---- PROBLEM CARDS ---- */

.problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.problem-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
}

.problem-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.problem-card p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.problem-punchline {
  text-align: center;
  margin-top: 40px;
  font-size: 1.25rem;
  font-weight: 600;
  font-style: italic;
  color: var(--color-accent);
}

/* ---- SOLUTION ---- */

.solution-text {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  max-width: 720px;
  margin-bottom: 40px;
  line-height: 1.7;
}

.architecture-diagram {
  background: var(--color-text);
  color: #e0e0f0;
  border-radius: var(--radius);
  padding: 32px;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 0.85rem;
  line-height: 1.8;
  overflow-x: auto;
  margin-bottom: 40px;
}

.key-points {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.key-point {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.key-point-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: var(--color-accent-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.key-point h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.key-point p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

/* ---- AUDIENCE TABS ---- */

.tab-nav {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0;
}

.tab-btn {
  padding: 10px 18px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  font-family: inherit;
  transition: all var(--transition);
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--color-text);
}

.tab-btn.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.tab-content {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-content.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.tab-headline {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.tab-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tab-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 1rem;
  line-height: 1.5;
}

.tab-list li::before {
  content: '';
  flex-shrink: 0;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  margin-top: 9px;
}

/* ---- COMPLIANCE BADGES ---- */

.badge-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 40px;
}

.badge-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 24px;
  background: var(--color-badge-bg);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.badge-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.badge-text h3 {
  font-size: 0.95rem;
  font-weight: 700;
}

.badge-text p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

/* ---- MODULE GRID ---- */

.module-group {
  margin-bottom: 32px;
}

.module-group-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.module-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.module-tag {
  padding: 8px 16px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text);
  transition: all var(--transition);
}

.module-tag:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}

/* ---- STATS ---- */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.stat {
  text-align: center;
  padding: 24px 16px;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.tech-detail {
  margin-top: 40px;
}

.tech-detail summary {
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-accent);
  padding: 12px 0;
}

.tech-detail-content {
  padding: 16px 0;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ---- CTA SECTION ---- */

.cta-section {
  background: var(--color-hero-bg);
  text-align: center;
}

.cta-section h2 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.cta-contact {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.cta-contact a {
  color: var(--color-accent);
  text-decoration: none;
}

.cta-contact a:hover {
  text-decoration: underline;
}

/* ---- FOOTER ---- */

footer {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
}

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

.footer-left {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.footer-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-accent);
}

/* ---- RESPONSIVE ---- */

@media (max-width: 768px) {
  :root {
    --section-gap: 64px;
  }

  .nav-links {
    display: none;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 24px;
    gap: 16px;
  }

  .nav-hamburger {
    display: block;
  }

  .nav-cta-desktop {
    display: none;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .tab-nav {
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .tab-nav::-webkit-scrollbar {
    display: none;
  }

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

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

/* ============ TEST RESULTS BANNER ============ */

.test-results-banner {
  margin-top: 3rem;
  background: linear-gradient(135deg, #0f7b6c 0%, #0a5f53 100%);
  border-radius: 12px;
  padding: 2rem 2.5rem;
  color: #fff;
}

.test-results-content {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.test-results-stats {
  flex: 1;
  min-width: 200px;
}

.test-results-number {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1;
}

.test-results-label {
  font-size: 1rem;
  opacity: 0.9;
  margin-top: 0.25rem;
}

.test-results-meta {
  display: flex;
  gap: 1.5rem;
  font-size: 0.85rem;
  opacity: 0.8;
  flex-wrap: wrap;
}

.test-results-meta span::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  background: rgba(255,255,255,0.5);
  border-radius: 50%;
  margin-right: 0.5rem;
  vertical-align: middle;
}

.test-results-banner .btn-secondary {
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
  white-space: nowrap;
  flex-shrink: 0;
}

.test-results-banner .btn-secondary:hover {
  background: rgba(255,255,255,0.25);
}

@media (max-width: 768px) {
  .test-results-content {
    flex-direction: column;
    text-align: center;
  }

  .test-results-meta {
    justify-content: center;
  }

  .test-results-number {
    font-size: 2rem;
  }
}