/* ============================================
   Neuro-E Landing Page — Lightweight CSS
   ============================================ */

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

:root {
  --primary: #00B8D9;
  --primary-dark: #009DB8;
  --primary-light: #E0F7FA;
  --accent: #00FF88;
  --text: #1A1A2E;
  --text-light: #6B7280;
  --bg: #FFFFFF;
  --bg-soft: #F8F9FC;
  --bg-alt: #F0F4FA;
  --border: #E5E7EB;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.1);
  --transition: 0.2s ease;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

/* Container */
.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Navigation ---- */
.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(--border);
  transition: box-shadow var(--transition);
}

.nav.scrolled {
  box-shadow: var(--shadow);
}

.nav-container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.2rem;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--primary);
  color: white;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-light);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
}

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

.nav-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  line-height: 1.4;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
}

.btn-block {
  width: 100%;
}

/* ---- Section Headers ---- */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
}

.section-header h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section-header p {
  color: var(--text-light);
  font-size: 1.1rem;
}

/* ---- Hero ---- */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(180deg, var(--bg-soft) 0%, var(--bg) 100%);
}

.hero-content {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}

.text-accent {
  color: var(--primary);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-light);
  margin-bottom: 36px;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 56px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 4px;
}

/* ---- Features ---- */
.features {
  padding: 96px 0;
}

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

.feature-card {
  padding: 32px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.feature-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ---- How It Works ---- */
.how-it-works {
  padding: 96px 0;
  background: var(--bg-soft);
}

.steps {
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.step {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.step-number {
  width: 44px;
  height: 44px;
  min-width: 44px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
}

.step-content h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.step-content p {
  color: var(--text-light);
  font-size: 0.95rem;
}

/* ---- Facts ---- */
.facts {
  padding: 64px 0;
  background: var(--primary);
  color: white;
}

.facts-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.fact-value {
  font-size: 2.5rem;
  font-weight: 700;
  display: block;
  margin-bottom: 4px;
}

.fact-label {
  font-size: 0.95rem;
  opacity: 0.85;
}

/* ---- Videos ---- */
.videos {
  padding: 96px 0;
}

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

.video-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}

.video-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.video-placeholder {
  aspect-ratio: 16/9;
  background: var(--bg-alt);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-light);
  cursor: pointer;
  transition: all var(--transition);
}

.video-placeholder:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.video-placeholder svg {
  opacity: 0.6;
}

.video-placeholder span {
  font-size: 0.85rem;
  font-weight: 500;
}

.video-card h3 {
  padding: 16px 16px 4px;
  font-size: 1rem;
  font-weight: 600;
}

.video-card p {
  padding: 0 16px 16px;
  color: var(--text-light);
  font-size: 0.9rem;
}

/* ---- Pricing ---- */
.pricing {
  padding: 96px 0;
  background: var(--bg-soft);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: start;
}

.pricing-grid--4 {
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.pricing-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  position: relative;
  transition: all var(--transition);
}

.pricing-card:hover {
  box-shadow: var(--shadow-md);
}

.pricing-card--popular {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg);
  transform: scale(1.03);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: white;
  padding: 4px 16px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

.pricing-tier {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 24px;
}

.pricing-price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-light);
}

.pricing-features {
  list-style: none;
  margin-bottom: 28px;
}

.pricing-features li {
  padding: 8px 0;
  font-size: 0.95rem;
  color: var(--text-light);
  border-bottom: 1px solid var(--border);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features li::before {
  content: "\2713 ";
  color: var(--accent);
  font-weight: 700;
  margin-right: 8px;
}

/* ---- Book a Demo ---- */
.book-demo {
  padding: 96px 0;
}

.booking-embed {
  max-width: 800px;
  margin: 0 auto;
}

.booking-embed iframe {
  background: var(--bg-soft);
}

/* ---- Footer ---- */
.footer {
  padding: 48px 0 24px;
  background: var(--bg-soft);
  border-top: 1px solid var(--border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.footer-brand p {
  color: var(--text-light);
  font-size: 0.85rem;
  margin-top: 8px;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--transition);
}

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

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  color: var(--text-light);
  font-size: 0.85rem;
}

/* ---- Chatbot Widget ---- */
.chatbot {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 200;
}

.chatbot-toggle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition);
}

.chatbot-toggle:hover {
  background: var(--primary-dark);
  transform: scale(1.05);
}

.chatbot-icon-close {
  display: none;
}

.chatbot.open .chatbot-icon-open {
  display: none;
}

.chatbot.open .chatbot-icon-close {
  display: block;
}

.chatbot-window {
  position: absolute;
  bottom: 72px;
  right: 0;
  width: 360px;
  height: 480px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  display: none;
  flex-direction: column;
  overflow: hidden;
}

.chatbot.open .chatbot-window {
  display: flex;
}

.chatbot-header {
  padding: 16px;
  background: var(--primary);
  color: white;
}

.chatbot-header-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.chatbot-avatar {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.chatbot-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.chatbot-status {
  font-size: 0.8rem;
  opacity: 0.8;
}

.chatbot-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chatbot-msg {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 0.9rem;
  line-height: 1.5;
}

.chatbot-msg p {
  margin: 0;
}

.chatbot-msg--bot {
  background: var(--bg-alt);
  color: var(--text);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}

.chatbot-msg--user {
  background: var(--primary);
  color: white;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.chatbot-msg--typing {
  background: var(--bg-alt);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
  display: flex;
  gap: 4px;
  padding: 14px 18px;
}

.typing-dot {
  width: 8px;
  height: 8px;
  background: var(--text-light);
  border-radius: 50%;
  animation: typingBounce 1.4s infinite;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

.chatbot-input {
  display: flex;
  padding: 12px;
  border-top: 1px solid var(--border);
  gap: 8px;
}

.chatbot-input input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 0.9rem;
  background: var(--bg);
  color: var(--text);
}

.chatbot-input input:focus {
  outline: none;
  border-color: var(--primary);
}

.chatbot-input button {
  width: 40px;
  height: 40px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}

.chatbot-input button:hover {
  background: var(--primary-dark);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .nav-links,
  .nav-actions {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

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

  .nav-actions.active {
    display: flex;
    position: absolute;
    top: calc(64px + var(--nav-links-height, 200px));
    left: 0;
    right: 0;
    background: var(--bg);
    padding: 0 24px 24px;
    border-bottom: 1px solid var(--border);
  }

  .hero {
    padding: 120px 0 60px;
  }

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

  .hero-cta {
    flex-direction: column;
    align-items: center;
  }

  .hero-stats {
    flex-direction: column;
    gap: 24px;
  }

  .features-grid,
  .videos-grid,
  .pricing-grid,
  .pricing-grid--4 {
    grid-template-columns: 1fr;
  }

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


  .footer-content {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }

  .pricing-card--popular {
    transform: none;
  }

  .chatbot-window {
    width: calc(100vw - 48px);
    right: -12px;
  }
}

/* ---- Fade-in Animations ---- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.75rem;
  }

  .section-header h2 {
    font-size: 1.6rem;
  }

  .fact-value {
    font-size: 2rem;
  }
}