/* ============================================================
   AI Dentist Services — Main Stylesheet
   Red/Black/White brand system — Conversion-optimized
   Mobile-first responsive design
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* --- CSS Variables --- */
:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f5f5f0;
  --color-bg-card: #ffffff;
  --color-bg-elevated: #fafafa;
  --color-text: #1a1a1a;
  --color-text-muted: #555555;
  --color-text-dim: #888888;
  --color-accent: #d4202a;
  --color-accent-hover: #b81a22;
  --color-accent-dark: #a0151c;
  --color-warm: #d4202a;
  --color-warm-light: #e8404a;
  --color-gold: #c4975a;
  --color-border: #e0e0d8;
  --color-border-light: #f0f0ea;
  --color-success: #2a8c4a;
  --font-heading: 'Inter', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --max-width: 1200px;
  --header-height: 72px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --transition: 0.2s ease;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent-hover); }

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.15;
  color: var(--color-text);
}
h1 { font-size: clamp(2.2rem, 5.5vw, 3.8rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.1rem; }
p { margin-bottom: 1rem; color: var(--color-text-muted); }

.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 1.25rem; }

/* --- AI Brand Mark --- */
.ai-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  width: 40px;
  height: 40px;
}
.ai-mark-circle {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid #1a1a1a;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  transition: transform 0.3s ease;
}
.ai-mark-text {
  position: relative;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 18px;
  color: #1a1a1a;
  letter-spacing: -0.02em;
  text-shadow: 0 1px 2px rgba(255,255,255,0.2);
  z-index: 1;
}
.ai-mark.hover .ai-mark-circle { transform: scale(1.08); }
.ai-mark-hero { width: 72px; height: 72px; }
.ai-mark-hero .ai-mark-text { font-size: 34px; }
.ai-mark-tiny { width: 24px; height: 24px; }
.ai-mark-tiny .ai-mark-text { font-size: 11px; }
.ai-mark-tiny .ai-mark-circle { border-width: 2px; }
.ai-mark-inline { width: 28px; height: 28px; margin-right: 0.5rem; vertical-align: middle; }
.ai-mark-inline .ai-mark-text { font-size: 13px; }
.ai-badge-hero { text-align: center; margin-bottom: 1.5rem; }

/* --- Site Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-text);
}
.logo-text { font-size: 1.1rem; font-weight: 500; color: var(--color-text-muted); }
.logo-text strong { color: var(--color-text); font-weight: 700; }
.nav-menu {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.nav-menu a {
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
}
.nav-menu a:hover, .nav-menu a.active { color: var(--color-text); background: var(--color-bg-alt); }
.nav-cta {
  background: var(--color-accent) !important;
  color: #ffffff !important;
  padding: 0.5rem 1.25rem !important;
  font-weight: 600 !important;
}
.nav-cta:hover { background: var(--color-accent-hover) !important; }
.nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; color: var(--color-text); padding: 0.5rem; }

/* --- Hero --- */
.hero {
  padding: 5rem 0 4rem;
  text-align: center;
  background: linear-gradient(180deg, #fafaf5 0%, #ffffff 100%);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 50% 30%, rgba(212,32,42,0.03) 0%, transparent 60%);
  pointer-events: none;
}
.hero h1 { font-size: clamp(2.5rem, 6vw, 4.2rem); font-weight: 900; letter-spacing: -0.03em; margin-bottom: 1.25rem; }
.hero-subtitle { font-size: 1.2rem; max-width: 680px; margin: 0 auto 2rem; color: var(--color-text-muted); line-height: 1.5; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin-bottom: 1.5rem; }
.hero-trust { display: flex; gap: 0.5rem; justify-content: center; color: var(--color-text-dim); font-size: 0.85rem; flex-wrap: wrap; }
.hero-compact { padding: 3rem 0 2rem; }
.hero-badge { text-align: center; margin-bottom: 1rem; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  text-decoration: none;
  line-height: 1.2;
}
.btn-primary {
  background: var(--color-accent);
  color: #ffffff !important;
  box-shadow: 0 4px 14px rgba(212,32,42,0.25);
}
.btn-primary:hover { background: var(--color-accent-hover); box-shadow: 0 6px 20px rgba(212,32,42,0.35); transform: translateY(-1px); }
.btn-secondary {
  background: transparent;
  color: var(--color-text) !important;
  border: 2px solid var(--color-border);
}
.btn-secondary:hover { border-color: var(--color-accent); color: var(--color-accent) !important; }
.btn-lg { padding: 1rem 2.5rem; font-size: 1.05rem; }
.btn-block { width: 100%; }

/* --- Sections --- */
.section { padding: 5rem 0; }
.section-alt { background: var(--color-bg-alt); }
.section-header { text-align: center; max-width: 640px; margin: 0 auto 3rem; }
.section-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: rgba(212,32,42,0.08);
  color: var(--color-accent);
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

/* --- Capabilities Grid --- */
.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}
.capability-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all 0.3s ease;
  opacity: 0;
  transform: translateY(20px);
}
.capability-card.visible { opacity: 1; transform: translateY(0); }
.capability-card:hover { border-color: var(--color-accent); box-shadow: 0 8px 30px rgba(0,0,0,0.06); transform: translateY(-2px); }
.cap-icon { font-size: 2rem; margin-bottom: 1rem; }
.capability-card h3 { margin-bottom: 0.75rem; }
.capability-card p { font-size: 0.95rem; margin: 0; }

/* --- Pain Section --- */
.pain-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
}
.pain-card {
  background: #fff;
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all 0.3s ease;
  opacity: 0;
  transform: translateY(15px);
}
.pain-card.visible { opacity: 1; transform: translateY(0); }
.pain-card:hover { border-color: var(--color-accent); box-shadow: 0 4px 20px rgba(0,0,0,0.05); }
.pain-scene { text-align: center; }
.pain-icon { font-size: 2.5rem; display: block; margin-bottom: 0.75rem; }
.pain-scene h4 { margin-bottom: 0.5rem; font-size: 1rem; }
.pain-scene p { font-size: 0.9rem; margin: 0; color: var(--color-text-dim); }
.pain-resolution {
  text-align: center;
  margin-top: 3rem;
  padding: 2rem;
  background: rgba(212,32,42,0.04);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(212,32,42,0.1);
}
.pain-resolution p { font-size: 1.1rem; margin: 0; }

/* --- Demo Section --- */
.demo-container {
  max-width: 720px;
  margin: 0 auto;
}
.demo-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s ease;
}
.demo-card.visible { opacity: 1; transform: translateY(0); }
.demo-status-bar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  background: #1a1a1a;
  color: #ccc;
  font-size: 0.85rem;
}
.demo-status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #555;
}
.demo-status-dot.incoming { background: #22c55e; box-shadow: 0 0 8px rgba(34,197,94,0.5); }
.demo-status-caller { margin-left: auto; color: #999; }
.demo-call {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.demo-message {
  display: flex;
  gap: 0.75rem;
  max-width: 85%;
}
.demo-message-patient { align-self: flex-start; }
.demo-message-ai { align-self: flex-end; flex-direction: row-reverse; }
.demo-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.ai-avatar { background: rgba(212,32,42,0.1); }
.demo-bubble {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  line-height: 1.5;
  position: relative;
}
.demo-message-patient .demo-bubble { background: var(--color-bg-alt); }
.demo-message-ai .demo-bubble { background: rgba(212,32,42,0.06); border: 1px solid rgba(212,32,42,0.1); }
.demo-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-dim);
  margin-bottom: 0.25rem;
}
.demo-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1.25rem;
  background: var(--color-bg-alt);
  flex-wrap: wrap;
}
.flow-step { text-align: center; }
.flow-num {
  display: inline-flex;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}
.flow-label { display: block; font-size: 0.8rem; font-weight: 600; }
.flow-desc { display: block; font-size: 0.7rem; color: var(--color-text-dim); }
.flow-arrow { font-size: 1.5rem; color: var(--color-accent); font-weight: 700; }

/* --- Offer Section --- */
.offer-section { background: linear-gradient(180deg, #ffffff 0%, #fafaf5 100%); }
.offer-card {
  max-width: 600px;
  margin: 0 auto;
  background: #fff;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 3rem;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,0.06);
}
.offer-badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  background: var(--color-accent);
  color: #fff;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}
.offer-card h2 { margin-bottom: 1.5rem; }
.offer-pricing {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}
.price-block { text-align: center; }
.price-amount {
  display: block;
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--color-text);
  line-height: 1;
}
.price-period { font-size: 0.85rem; color: var(--color-text-dim); }
.price-sep { color: var(--color-text-dim); font-size: 0.9rem; }
.offer-features {
  list-style: none;
  text-align: left;
  margin-bottom: 2rem;
}
.offer-features li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border-light);
  font-size: 0.95rem;
}
.offer-features li:last-child { border-bottom: none; }
.offer-disclaimer { font-size: 0.8rem; color: var(--color-text-dim); margin-top: 1rem; }

/* --- Stats --- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  text-align: center;
}
.stat-item { opacity: 0; transform: translateY(20px); transition: all 0.5s ease; }
.stat-item.visible { opacity: 1; transform: translateY(0); }
.stat-number {
  display: block;
  font-size: 3rem;
  font-weight: 900;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 0.5rem;
}
.stat-number.plus::after { content: '%'; }
.stat-label { font-size: 0.9rem; color: var(--color-text-muted); }

/* --- CTA Section --- */
.cta-section {
  padding: 5rem 0;
  text-align: center;
  background: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
}
.cta-section h2 { color: #fff; margin-bottom: 1rem; }
.cta-section p { color: #aaa; margin-bottom: 2rem; }

/* --- Form --- */
.form-container {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 2rem;
  align-items: start;
}
.form-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}
.form-card h2 { margin-bottom: 1.5rem; }
.form-group { margin-bottom: 1.25rem; }
.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
  color: var(--color-text);
}
.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: var(--font-body);
  transition: border-color var(--transition);
}
.form-group input:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 3px rgba(212,32,42,0.1); }
.form-disclaimer { font-size: 0.8rem; color: var(--color-text-dim); text-align: center; margin-top: 1rem; }
.form-success {
  text-align: center;
  padding: 2rem;
}
.success-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--color-success);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}
.form-success h3 { margin-bottom: 0.5rem; }
.form-success p { max-width: 400px; margin: 0 auto 0.5rem; }
.form-sidebar { display: flex; flex-direction: column; gap: 1rem; }
.sidebar-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 1.5rem;
}
.sidebar-card h4 { margin-bottom: 0.75rem; font-size: 0.95rem; }
.sidebar-card ul { list-style: none; }
.sidebar-card li { padding: 0.35rem 0; font-size: 0.9rem; color: var(--color-text-muted); }
.sidebar-testimonial { 
  background: rgba(212,32,42,0.04);
  border-color: rgba(212,32,42,0.1);
  font-style: italic;
}
.testimonial-attribution {
  font-size: 0.8rem;
  color: var(--color-text-dim);
  margin-top: 0.5rem;
  font-style: normal;
}

/* --- Footer --- */
.site-footer {
  background: #1a1a1a;
  color: #aaa;
  padding: 3rem 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}
.footer-col h4 { color: #fff; font-size: 0.95rem; margin-bottom: 1rem; }
.footer-col p { font-size: 0.85rem; color: #888; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 0.5rem; }
.footer-col a { color: #999; font-size: 0.85rem; }
.footer-col a:hover { color: #fff; }
.footer-brand p { margin-top: 0.5rem; }
.footer-bottom {
  border-top: 1px solid #333;
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: #666;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.footer-bottom a { color: #888; }
.footer-bottom a:hover { color: #fff; }

/* --- Card Grid (for service pages) --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}
.service-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all 0.3s ease;
}
.service-card:hover { border-color: var(--color-accent); box-shadow: 0 8px 30px rgba(0,0,0,0.06); }
.service-card-icon { font-size: 2rem; margin-bottom: 1rem; }
.service-card h3 { margin-bottom: 0.75rem; }
.service-card p { font-size: 0.95rem; margin-bottom: 1rem; }
.card-link { font-weight: 600; font-size: 0.9rem; }

/* --- Pipeline Steps --- */
.pipeline-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  text-align: center;
}
.pipeline-step {
  padding: 2rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
}
.step-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1rem;
}
.pipeline-step h4 { margin-bottom: 0.5rem; }
.pipeline-step p { font-size: 0.9rem; margin: 0; }

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 30px rgba(0,0,0,0.08);
  }
  .nav-menu.open { display: flex; }
  .nav-toggle { display: block; }
  .form-container { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .pipeline-steps { grid-template-columns: 1fr; }
  .demo-flow { flex-direction: column; }
  .demo-message { max-width: 95%; }
  .offer-card { padding: 1.5rem; }
  .offer-pricing { flex-direction: column; gap: 0.5rem; }
  .hero { padding: 3rem 0 2rem; }
  .section { padding: 3rem 0; }
}

@media (max-width: 480px) {
  h1 { font-size: 1.8rem; }
  .hero-actions { flex-direction: column; }
  .btn-lg { width: 100%; }
  .capabilities-grid { grid-template-columns: 1fr; }
  .pain-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
}