/* Lancet Research Platform - Shared Styles */
/* Theme: Lancet Dark (#A51C30 primary, #0f172a background) */

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

:root {
  --primary: #A51C30;
  --primary-light: #c42847;
  --primary-dark: #7d1525;
  --bg-deep: #0f172a;
  --bg-card: #1e293b;
  --bg-card-hover: #263449;
  --bg-surface: #162032;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: #334155;
  --border-hover: #475569;
  --accent-glow: rgba(165,28,48,0.35);
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', sans-serif;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
  --transition: all 0.3s cubic-bezier(.16,1,.3,1);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary-light); text-decoration: none; transition: var(--transition); }
a:hover { color: #e8405a; }

/* ---- Top Navigation ---- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 0.9rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(15,23,42,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav .brand {
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.nav .brand:hover { color: var(--primary-light); }
.nav .brand .brand-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--primary);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}
.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.45rem 0.85rem;
  font-size: 0.88rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-links a:hover { color: var(--text-primary); background: rgba(255,255,255,0.06); }
.nav-links a.active { color: var(--primary-light); background: rgba(165,28,48,0.12); }

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.3rem;
}

/* ---- Hero Section ---- */
.hero {
  padding: 7rem 2rem 5rem;
  text-align: center;
  background: linear-gradient(170deg, var(--bg-deep) 0%, #1a0f15 50%, var(--bg-deep) 100%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(165,28,48,0.12) 0%, transparent 70%);
  pointer-events: none;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  background: linear-gradient(135deg, #fff 20%, var(--primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}
.hero .subtitle {
  color: var(--text-secondary);
  max-width: 680px;
  margin: 1.2rem auto;
  font-size: 1.15rem;
}
.hero .badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  background: rgba(165,28,48,0.15);
  color: var(--primary-light);
  border: 1px solid rgba(165,28,48,0.3);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  margin-bottom: 1.2rem;
}

/* ---- Buttons ---- */
.btn-group { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-top: 2rem; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 2rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
}
.btn-primary {
  background: var(--primary);
  color: #fff;
  border: none;
}
.btn-primary:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border);
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary-light);
  transform: translateY(-2px);
}

/* ---- Sections ---- */
.section {
  padding: 5rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}
.section-title {
  text-align: center;
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}
.section-desc {
  text-align: center;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 3rem;
  font-size: 1.05rem;
}

/* ---- Container ---- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem;
}

/* ---- Cards ---- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: var(--transition);
}
.card:hover {
  border-color: rgba(165,28,48,0.4);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.25);
  background: var(--bg-card-hover);
}
.card h3 { color: var(--text-primary); margin-bottom: 0.5rem; font-size: 1.15rem; }
.card p { color: var(--text-secondary); font-size: 0.95rem; }
.card .card-icon { font-size: 2.2rem; margin-bottom: 1rem; }
.card .icon { font-size: 2rem; margin-bottom: 1rem; }

/* ---- Stats ---- */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 2rem;
  padding: 2rem 0;
  text-align: center;
}
.stat-num {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary-light);
}
.stat-label {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 0.3rem;
}
.stat .num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary-light);
}
.stat .label {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ---- Pricing ---- */
.pricing-grid, .price-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}
.price-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.2rem;
  text-align: center;
  transition: var(--transition);
  position: relative;
}
.price-card:hover {
  border-color: rgba(165,28,48,0.4);
  transform: translateY(-4px);
}
.price-card.featured {
  border-color: var(--primary);
  transform: scale(1.03);
  box-shadow: 0 8px 40px var(--accent-glow);
}
.price-card h3 { color: var(--text-primary); margin-bottom: 0.5rem; }
.price-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: #fff;
  padding: 0.25rem 1rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
}
.price-tag, .price {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary-light);
  margin: 0.8rem 0;
}
.price span { font-size: 0.9rem; color: var(--text-muted); }
.price-card ul {
  list-style: none;
  text-align: left;
  margin: 1.5rem 0;
}
.price-card li {
  padding: 0.45rem 0;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  font-size: 0.95rem;
}
.price-card li::before { content: '\2713  '; color: var(--primary-light); }

/* ---- Timeline ---- */
.timeline { position: relative; padding-left: 2rem; }
.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: rgba(165,28,48,0.3);
}
.timeline-item { position: relative; margin-bottom: 2rem; padding-left: 1.5rem; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.35rem; top: 0.5rem;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--primary);
}
.timeline-item h4 { color: var(--text-primary); margin-bottom: 0.3rem; }
.timeline-item p { color: var(--text-secondary); font-size: 0.95rem; }

/* ---- Footer ---- */
.footer, footer {
  text-align: center;
  padding: 3rem 2rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  margin-top: 4rem;
}
.footer-links, .footer a, footer a {
  color: var(--primary-light);
  text-decoration: none;
}
.footer-links { display: flex; gap: 2rem; justify-content: center; margin-bottom: 1rem; }

/* ---- OPC Floating Nav ---- */
.opc-floating-nav {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}
.opc-floating-toggle {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px var(--accent-glow);
  transition: var(--transition);
}
.opc-floating-toggle:hover {
  background: var(--primary-light);
  transform: scale(1.08);
}
.opc-floating-menu {
  display: none;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.6rem;
  min-width: 200px;
  box-shadow: var(--shadow);
}
.opc-floating-menu.open { display: flex; }
.opc-floating-menu a {
  color: var(--text-secondary);
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  text-decoration: none;
  transition: var(--transition);
}
.opc-floating-menu a:hover {
  background: rgba(165,28,48,0.12);
  color: var(--text-primary);
}
.opc-floating-menu a .opc-icon { margin-right: 0.5rem; }

/* ---- Back to Top ---- */
.back-to-top {
  position: fixed;
  bottom: 82px;
  right: 30px;
  z-index: 998;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(10px);
  transition: var(--transition);
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* ---- Pre / Code ---- */
pre {
  background: var(--bg-surface);
  padding: 1.2rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  overflow-x: auto;
  border: 1px solid var(--border);
  font-size: 0.9rem;
  line-height: 1.6;
}
code { font-family: 'SF Mono', 'Fira Code', monospace; }

/* ---- Grid ---- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

/* ---- Fade-in animation ---- */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(.16,1,.3,1), transform 0.6s cubic-bezier(.16,1,.3,1);
}
.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: rgba(15,23,42,0.97);
    backdrop-filter: blur(12px);
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    gap: 0.2rem;
  }
  .nav-toggle { display: block; }
  .hero { padding: 5rem 1.5rem 3.5rem; }
  .hero h1 { font-size: 2rem; }
  .section { padding: 3rem 1.2rem; }
  .container { padding: 1.2rem; }
  .card-grid, .grid { grid-template-columns: 1fr; }
  .pricing-grid, .price-cards { grid-template-columns: 1fr; }
  .price-card.featured { transform: scale(1); }
  .btn-group { flex-direction: column; align-items: center; }
}

@media (max-width: 480px) {
  .hero { padding: 4rem 1rem 2.5rem; }
  .section { padding: 2rem 1rem; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
}