:root {
  /* Apple Light Palette Tokens */
  --bg-color: #FBFBFD;               /* Apple Canvas Surface */
  --bg-color-alt: #F5F5F7;           /* Apple Secondary Section Tint */
  --card-bg: #FFFFFF;                /* Pure White Card Base */
  
  /* Liquid Glass Translucency Tokens */
  --glass-bg: rgba(255, 255, 255, 0.78);
  --glass-bg-hover: rgba(255, 255, 255, 0.92);
  --glass-border: rgba(255, 255, 255, 0.65);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.05);

  /* Borders & Shadows */
  --border-color: rgba(0, 0, 0, 0.07);
  --border-color-hover: rgba(0, 0, 0, 0.13);
  --shadow-subtle: 0 2px 8px rgba(0, 0, 0, 0.03);
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.03), 0 1px 2px rgba(0, 0, 0, 0.02);
  --shadow-elevated: 0 12px 36px rgba(0, 0, 0, 0.06), 0 4px 12px rgba(0, 0, 0, 0.03);

  /* Typography Colors (High Contrast WCAG AAA) */
  --text-primary: #1D1D1F;           /* Apple Charcoal Header Text */
  --text-secondary: #515154;         /* Apple Slate Body Text */
  --text-muted: #86868B;             /* Apple Subhead & Caption Text */
  
  /* Accents — used sparingly for CTAs and interactive states only */
  --accent-color: #3A7BD5;           /* Soft Steel Blue — less aggressive than Apple Blue */
  --accent-hover: #2563EB;
  --accent-soft: #F0F4FF;            /* Very light neutral tint */
  --check-color: #34C759;            /* Apple System Green for checkmarks */
  --check-soft: #F0FBF4;             /* Soft green tint for checkmark backgrounds */

  /* Apple System Radii */
  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --radius-pill: 9999px;

  /* Typography Stack */
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --transition-apple: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Reset & Base Accessibility */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

*:focus-visible {
  outline: 3px solid rgba(0, 102, 204, 0.4);
  outline-offset: 2px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
  font-size: 16px;
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-family);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  overflow-x: hidden;
  line-height: 1.6;
}

/* Layout */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 6rem 0;
  border-bottom: 1px solid var(--border-color);
}

.section-alt {
  background-color: var(--bg-color-alt);
}

.grid {
  display: grid;
  gap: 1.5rem;
}

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

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 768px) {
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
  .section {
    padding: 3.5rem 0;
  }
}

/* Typography Hierarchy (Apple SF Pro Style) */
h1, h2, h3, h4 {
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  text-wrap: balance;
}

p {
  color: var(--text-secondary);
  line-height: 1.65;
  font-size: 1.05rem;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  background-color: var(--bg-color-alt);
  border: 1px solid var(--border-color);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-pill);
  margin-bottom: 1rem;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 4rem auto;
}

.section-title {
  font-size: 2.5rem;
  line-height: 1.16;
  letter-spacing: -0.03em;
  margin-bottom: 1rem;
}

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

/* Liquid Glass Floating Header */
.header {
  position: fixed;
  top: 1rem;
  left: 0;
  right: 0;
  z-index: 100;
  pointer-events: none;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 4.75rem;
  padding: 0 1.25rem 0 1.5rem;
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  box-shadow: var(--glass-shadow);
  pointer-events: auto;
  transition: var(--transition-apple);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  text-decoration: none;
}

.logo-image {
  height: 2.6rem;
  width: auto;
  border-radius: 6px;
}

.logo-text {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition-apple);
}

.nav-link:hover {
  color: var(--text-primary);
}

.nav-btn {
  padding: 0.45rem 1.15rem;
  font-size: 0.85rem;
  min-height: 36px;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 1.25rem;
  height: 0.875rem;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 110;
}

.menu-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--text-primary);
  border-radius: 1px;
  transition: var(--transition-apple);
}

@media (max-width: 768px) {
  .header {
    top: 0.75rem;
  }
  .menu-toggle {
    display: flex;
  }
  
  .nav {
    position: absolute;
    top: 4.25rem;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    flex-direction: column;
    padding: 1.75rem;
    gap: 1.25rem;
    box-shadow: var(--shadow-elevated);
    display: none;
  }
  
  .nav.active {
    display: flex;
  }
}

/* Buttons (Apple Pill Style & 44px Touch Targets) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.75rem 2rem;
  font-family: var(--font-family);
  font-size: 0.975rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition-apple);
  box-shadow: var(--shadow-subtle);
  border: none;
}

.btn-filled {
  background-color: var(--text-primary);
  color: #FFFFFF;
}

.btn-filled:hover {
  background-color: #333336;
  transform: scale(1.02);
  box-shadow: var(--shadow-elevated);
}

.btn-outline {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(10px);
}

.btn-outline:hover {
  background-color: #FFFFFF;
  border-color: var(--border-color-hover);
  transform: scale(1.02);
  box-shadow: var(--shadow-subtle);
}

.btn-block {
  width: 100%;
}

/* Hero Section */
.hero {
  padding: 11rem 0 7rem 0;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.hero-container {
  max-width: 860px;
  margin: 0 auto;
}

.hero-title {
  font-size: 3.75rem;
  line-height: 1.08;
  letter-spacing: -0.04em;
  margin-bottom: 1.5rem;
  font-weight: 800;
}

.hero-subtitle {
  font-size: 1.25rem;
  line-height: 1.6;
  margin: 0 auto 2.5rem auto;
  max-width: 720px;
  color: var(--text-secondary);
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

@media (max-width: 768px) {
  .hero {
    padding: 8.5rem 0 5rem 0;
  }
  .hero-title {
    font-size: 2.5rem;
  }
  .hero-subtitle {
    font-size: 1.05rem;
  }
  .hero-actions {
    flex-direction: column;
  }
}

/* Apple System Cards (Voice Agents) */
.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  transition: var(--transition-apple);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
}

.card:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--shadow-elevated);
  border-color: var(--border-color-hover);
}

.card-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 0.875rem;
  letter-spacing: -0.02em;
}

.card-description {
  font-size: 0.975rem;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
  line-height: 1.6;
  flex-grow: 1;
}

.card-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
}

.card-list li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.625rem;
}

.card-list li::before {
  content: '✓';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background-color: var(--check-soft);
  color: var(--check-color);
  font-weight: 800;
  font-size: 0.75rem;
  flex-shrink: 0;
}

/* Integration Cards */
.integration-card {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  background-color: var(--card-bg);
  transition: var(--transition-apple);
  box-shadow: var(--shadow-card);
}

.integration-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-elevated);
  border-color: var(--border-color-hover);
}

.integration-card h4 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.integration-card p {
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ROI Calculator UI */
.calculator-wrapper {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-elevated);
  background-color: var(--card-bg);
}

.calc-inputs {
  padding: 3rem;
  display: flex;
  flex-direction: column;
  gap: 2.25rem;
}

.calc-control-group {
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
}

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

.slider-label {
  font-size: 1rem;
  font-weight: 600;
}

.slider-value {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
}

.calc-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background-color: var(--bg-color-alt);
  outline: none;
}

.calc-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background-color: #FFFFFF;
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  cursor: pointer;
  transition: var(--transition-apple);
}

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

.calc-rates {
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.rate-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.calc-results {
  padding: 3rem;
  background-color: var(--bg-color-alt);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 2rem;
}

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

.result-box {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.res-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
}

.res-value {
  font-size: 1.65rem;
  font-weight: 800;
}

.result-savings {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
}

.savings-label {
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.savings-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

@media (max-width: 900px) {
  .calculator-wrapper {
    grid-template-columns: 1fr;
  }
  .calc-results {
    border-left: none;
    border-top: 1px solid var(--border-color);
  }
}

/* Reviews / Testimonials */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.review-card {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
  position: relative;
  transition: var(--transition-default);
}

.review-card:hover {
  border-color: var(--border-color-hover);
}

.review-quote-mark {
  font-size: 2.5rem;
  line-height: 1;
  font-family: Georgia, serif;
  color: var(--text-muted);
  opacity: 0.4;
  margin-bottom: -1rem;
}

.review-body {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-secondary);
  flex-grow: 1;
}

.review-footer {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.review-stars {
  font-size: 0.85rem;
  letter-spacing: 2px;
  color: #eab308;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.review-avatar-img {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background-repeat: no-repeat;
  flex-shrink: 0;
}

.review-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}

.review-role {
  font-size: 0.775rem;
  color: var(--text-muted);
  margin-top: 0.1rem;
}

@media (max-width: 992px) {
  .reviews-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .reviews-grid {
    grid-template-columns: 1fr;
  }
}

/* Contact Form */

.contact-container {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 4rem;
  align-items: flex-start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.contact-title {
  font-size: 2.25rem;
}

.contact-text {
  font-size: 1rem;
  line-height: 1.6;
}

.contact-form-wrapper {
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-elevated);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-field-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input {
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  min-height: 44px;
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition-default);
  box-shadow: var(--shadow-subtle);
}

.form-input:focus {
  border-color: var(--border-color-hover);
}

select.form-input {
  cursor: pointer;
}

.error-msg {
  font-size: 0.75rem;
  color: #f87171;
  display: none;
}

.form-group.has-error .form-input {
  border-color: #ef4444;
}

.form-group.has-error .error-msg {
  display: block;
}

/* Success Modal Overlay */
.form-success {
  position: absolute;
  inset: 0;
  background-color: var(--bg-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2.5rem;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition-default);
}

.form-success.active {
  opacity: 1;
  pointer-events: all;
}

.form-success h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.form-success p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  max-width: 320px;
}

@media (max-width: 900px) {
  .contact-container {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 4.5rem 0 2rem 0;
  background-color: var(--bg-color);
}

.footer-container {
  display: flex;
  justify-content: space-between;
  gap: 3rem;
  margin-bottom: 3.5rem;
  flex-wrap: wrap;
}

.footer-brand {
  max-width: 300px;
}

.footer-brand p {
  font-size: 0.85rem;
  margin-top: 0.75rem;
}

.footer-links {
  display: flex;
  gap: 4.5rem;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-col span {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}

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

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

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
}

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

.footer-social-icons {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.footer-social-icons a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: var(--transition-apple);
  box-shadow: var(--shadow-subtle);
}

.footer-social-icons a:hover {
  color: var(--accent-color);
  border-color: var(--accent-color);
  background-color: var(--accent-soft);
  transform: translateY(-2px);
  box-shadow: var(--shadow-elevated);
}



@media (max-width: 768px) {
  .footer-container {
    flex-direction: column;
    gap: 2rem;
  }
  .footer-links {
    gap: 3rem;
  }

  /* Compact Mobile Layout Tweaks */
  :root {
    --container-padding: 0.85rem;
  }

  .section {
    padding: 1.5rem 0;
  }

  .section-header {
    margin-bottom: 2rem;
  }

  .hero {
    padding: 9.5rem 0 2.5rem 0;
  }

  .hero-title {
    font-size: 1.7rem;
    line-height: 1.15;
    margin-bottom: 1rem;
  }

  .hero-subtitle {
    font-size: 0.825rem;
    margin-bottom: 1.25rem;
  }

  .hero-actions {
    gap: 0.75rem;
  }

  .btn {
    min-height: 38px;
    padding: 0.45rem 1rem;
    font-size: 0.825rem;
  }

  .section-title {
    font-size: 1.35rem;
    margin-bottom: 0.5rem;
  }

  .section-subtitle {
    font-size: 0.825rem;
  }

  .card {
    padding: 1rem;
    gap: 0.5rem;
  }

  .card-title {
    font-size: 1.05rem;
    margin-bottom: 0.25rem;
  }

  .card-description {
    font-size: 0.825rem;
    margin-bottom: 1rem;
  }

  .card-list {
    padding-top: 0.75rem;
    gap: 0.4rem;
  }

  .card-list li {
    font-size: 0.775rem;
  }

  .integration-card {
    padding: 1rem;
  }

  .integration-card h4 {
    font-size: 0.95rem;
    margin-bottom: 0.35rem;
  }

  .integration-card p {
    font-size: 0.775rem;
  }

  /* ROI Calculator mobile compact layout */
  .calc-inputs {
    padding: 1rem;
    gap: 1.25rem;
  }

  .calc-results {
    padding: 1rem;
    gap: 1.25rem;
  }

  .slider-label {
    font-size: 0.825rem;
  }

  .slider-value {
    font-size: 0.95rem;
  }

  .res-label {
    font-size: 0.7rem;
  }

  .res-value {
    font-size: 1.25rem;
  }

  .savings-value {
    font-size: 1.85rem;
  }

  .savings-note {
    font-size: 0.8rem;
  }

  .review-card {
    padding: 1.15rem;
    gap: 0.65rem;
  }

  .review-quote-mark {
    font-size: 1.5rem;
    margin-bottom: -0.4rem;
  }

  .review-body {
    font-size: 0.8rem;
    line-height: 1.45;
  }

  .review-footer {
    padding-top: 0.65rem;
    gap: 0.4rem;
  }

  /* Only display the first 3 reviews on mobile viewports */
  .review-card:nth-child(n+4) {
    display: none;
  }

  .contact-title {
    font-size: 1.45rem;
  }

  .contact-form-wrapper {
    padding: 1.25rem;
  }

  .form-group {
    gap: 0.35rem;
  }

  .form-input {
    min-height: 40px;
    padding: 0.55rem 0.85rem;
    font-size: 0.85rem;
  }

  .footer {
    padding: 2.25rem 0 1.25rem 0;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.85rem;
  }
}