:root {
  --bg-primary: #070b14;
  --bg-secondary: #0c1222;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(22, 34, 61, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-glow: rgba(16, 185, 129, 0.25);
  --accent-emerald: #10b981;
  --accent-emerald-glow: rgba(16, 185, 129, 0.4);
  --accent-cyan: #06b6d4;
  --accent-cyan-glow: rgba(6, 182, 212, 0.35);
  --accent-amber: #f59e0b;
  --accent-red: #ef4444;
  --accent-red-glow: rgba(239, 68, 68, 0.4);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-sub: #64748b;
  --font-sans: 'Plus Jakarta Sans', 'Inter', -apple-system, sans-serif;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Background Ambient Glows */
.ambient-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.glow-circle-1 {
  position: absolute;
  top: -150px;
  left: 10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.12) 0%, rgba(16, 185, 129, 0) 70%);
  border-radius: 50%;
  filter: blur(80px);
}

.glow-circle-2 {
  position: absolute;
  top: 40%;
  right: -100px;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.1) 0%, rgba(6, 182, 212, 0) 70%);
  border-radius: 50%;
  filter: blur(100px);
}

/* Navigation */
header.navbar {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 100;
  background: rgba(7, 11, 20, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 2rem;
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-main);
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent-emerald), var(--accent-cyan));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 18px var(--accent-emerald-glow);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.brand-badge {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  padding: 2px 8px;
  border-radius: 20px;
  border: 1px solid rgba(16, 185, 129, 0.3);
  margin-left: 6px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.8rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  transition: var(--transition);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0.65rem 1.4rem;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #ffffff;
  box-shadow: 0 4px 14px var(--accent-emerald-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.55);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-main);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-outline {
  background: transparent;
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: var(--accent-emerald);
}

.btn-outline:hover {
  background: rgba(16, 185, 129, 0.1);
}

.btn-danger {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  color: #fff;
  box-shadow: 0 4px 14px var(--accent-red-glow);
}

/* Containers & Layout */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 2rem;
  position: relative;
  z-index: 1;
}

section {
  padding: 5rem 0;
}

/* Hero Section */
.hero-section {
  padding: 4.5rem 0 3.5rem;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
  padding: 6px 16px;
  border-radius: 30px;
  margin-bottom: 1.8rem;
  font-size: 0.85rem;
  color: var(--accent-emerald);
  font-weight: 600;
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulse-ring 1.8s infinite;
}

@keyframes pulse-ring {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1.1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.hero-title {
  font-size: 3.8rem;
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -1.5px;
  margin-bottom: 1.5rem;
  background: linear-gradient(180deg, #ffffff 40%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-title span.highlight {
  background: linear-gradient(135deg, #10b981 20%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  max-width: 760px;
  margin: 0 auto 2.5rem;
  font-size: 1.2rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  margin-bottom: 3.5rem;
}

/* Biometric Live Ticker */
.live-ticker {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(16px);
  border-radius: var(--radius-md);
  padding: 1.2rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 960px;
  margin: 0 auto;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.ticker-item {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ticker-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.ticker-icon.pulse { background: rgba(16, 185, 129, 0.15); color: var(--accent-emerald); }
.ticker-icon.heart { background: rgba(239, 68, 68, 0.15); color: var(--accent-red); }
.ticker-icon.hrv { background: rgba(6, 182, 212, 0.15); color: var(--accent-cyan); }
.ticker-icon.temp { background: rgba(245, 158, 11, 0.15); color: var(--accent-amber); }

.ticker-content {
  text-align: left;
}

.ticker-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-sub);
  font-weight: 700;
  letter-spacing: 0.5px;
}

.ticker-value {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  font-variant-numeric: tabular-nums;
}

.ticker-value small {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-left: 2px;
}

/* Interactive Simulator Section */
.simulator-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 3rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  position: relative;
  overflow: hidden;
}

.simulator-controls {
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

.control-card {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-color);
  padding: 1.4rem;
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.control-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

.control-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.8rem;
}

.control-title {
  font-size: 0.95rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.control-readout {
  font-size: 1.1rem;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--accent-emerald);
}

.slider-input {
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: #1e293b;
  border-radius: 5px;
  outline: none;
}

.slider-input::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--accent-emerald);
  cursor: pointer;
  box-shadow: 0 0 10px var(--accent-emerald-glow);
  transition: var(--transition);
}

.slider-input::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

/* Visualizer Display Box */
.display-box {
  background: #050811;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.2rem;
  position: relative;
  min-height: 440px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
}

.display-box.alert-active {
  border-color: var(--accent-red);
  box-shadow: 0 0 35px var(--accent-red-glow);
  animation: alert-border-pulse 1.2s infinite alternate;
}

@keyframes alert-border-pulse {
  from { border-color: rgba(239, 68, 68, 0.4); }
  to { border-color: rgba(239, 68, 68, 1); }
}

.display-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.display-status-tag {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 20px;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
}

.display-box.alert-active .display-status-tag {
  background: rgba(239, 68, 68, 0.2);
  color: var(--accent-red);
}

.waveform-canvas {
  width: 100%;
  height: 120px;
  margin: 1.5rem 0;
}

.alert-banner {
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.35);
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  display: none;
  animation: slideInDown 0.3s ease-out;
}

.display-box.alert-active .alert-banner {
  display: block;
}

.alert-banner-title {
  color: var(--accent-red);
  font-size: 0.88rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.alert-banner-desc {
  font-size: 0.8rem;
  color: #fca5a5;
  line-height: 1.4;
}

/* Feature Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.2rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(16, 185, 129, 0.3);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

.feature-media {
  width: 100%;
  height: 220px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 1.5rem;
  background: #02040a;
}

.feature-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.feature-card:hover .feature-media img {
  transform: scale(1.05);
}

.feature-icon-badge {
  display: inline-flex;
  padding: 8px;
  border-radius: 8px;
  background: rgba(16, 185, 129, 0.1);
  color: var(--accent-emerald);
  margin-bottom: 1rem;
}

.feature-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
}

.feature-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Pricing Grid */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.8rem 2.2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  position: relative;
}

.pricing-card.popular {
  border-color: var(--accent-emerald);
  box-shadow: 0 0 35px rgba(16, 185, 129, 0.2);
  background: linear-gradient(180deg, rgba(16, 185, 129, 0.08) 0%, rgba(15, 23, 42, 0.8) 100%);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-emerald);
  color: #070b14;
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  padding: 4px 14px;
  border-radius: 20px;
  letter-spacing: 0.5px;
}

.plan-name {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 0.4rem;
}

.plan-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  min-height: 40px;
  margin-bottom: 1.5rem;
}

.plan-price {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 1.8rem;
}

.plan-price span.period {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-sub);
}

.plan-features {
  list-style: none;
  margin-bottom: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.plan-features li {
  font-size: 0.92rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
}

.plan-features li svg {
  color: var(--accent-emerald);
  flex-shrink: 0;
}

/* Registration Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(3, 7, 18, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal-overlay.active {
  display: flex;
}

.modal-box {
  background: #0b1120;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 620px;
  width: 100%;
  padding: 2.5rem;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.7);
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-close-btn {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: transparent;
  border: none;
  color: var(--text-sub);
  font-size: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
}

.modal-close-btn:hover {
  color: var(--text-main);
}

.form-group {
  margin-bottom: 1.2rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

.form-control {
  width: 100%;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  color: var(--text-main);
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}

.form-control:focus {
  border-color: var(--accent-emerald);
  box-shadow: 0 0 10px var(--accent-emerald-glow);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

/* Success View in Modal */
.modal-success-view {
  display: none;
  text-align: center;
  padding: 1.5rem 0;
}

.success-icon-badge {
  width: 65px;
  height: 65px;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  background: #040711;
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 1.2rem;
  color: var(--text-main);
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-col ul a {
  color: var(--text-sub);
  text-decoration: none;
  font-size: 0.88rem;
  transition: var(--transition);
}

.footer-col ul a:hover {
  color: var(--text-main);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-sub);
}

/* Responsive adjustments */
@media (max-width: 992px) {
  .hero-title { font-size: 2.8rem; }
  .simulator-container { grid-template-columns: 1fr; padding: 2rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hero-title { font-size: 2.2rem; }
  .hero-cta-group { flex-direction: column; width: 100%; }
  .hero-cta-group .btn { width: 100%; }
  .live-ticker { flex-direction: column; gap: 1.2rem; align-items: flex-start; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 1rem; text-align: center; }
}