:root {
  --terra-900: #0a0a0a;
  --terra-800: #171717;
  --terra-700: #404040;
  --terra-600: #525252;
  --terra-500: #737373;
  --terra-400: #a3a3a3;
  --terra-300: #d4d4d4;
  --terra-200: #e5e5e5;
  --terra-100: #f5f5f5;
  --terra-50: #fafafa;
  --white: #ffffff;
  --accent: #262626;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
  --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.08);
  --radius: 14px;
  --radius-lg: 22px;
  --font-display: "Outfit", system-ui, sans-serif;
  --font-body: "DM Sans", system-ui, sans-serif;
  --header-h: 72px;
  --transition: 0.25s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--terra-800);
  background: var(--terra-50);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--terra-500);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--terra-300);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--terra-900);
  line-height: 1.2;
  margin-top: 0;
}

.container {
  width: min(1120px, calc(100% - 2rem));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 9999;
  padding: 0.75rem 1rem;
  background: var(--terra-500);
  color: var(--white);
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 250, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-h);
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--terra-900);
}

.brand__text {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: 0.04em;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a:not(.btn) {
  text-decoration: none;
  font-weight: 500;
  color: var(--terra-700);
}

.site-nav a:not(.btn):hover {
  color: var(--terra-500);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.5rem;
  border: none;
  background: transparent;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--terra-800);
  border-radius: 2px;
  transition: var(--transition);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  border-radius: 999px;
  border: 2px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: linear-gradient(135deg, var(--terra-700), var(--terra-900));
  color: var(--white);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18);
}

.btn--primary:hover {
  color: var(--white);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.22);
}

.btn--outline {
  background: transparent;
  border-color: var(--terra-400);
  color: var(--terra-700);
}

.btn--outline:hover {
  background: var(--terra-100);
  color: var(--terra-800);
}

.btn--sm {
  padding: 0.55rem 1.1rem;
  font-size: 0.9rem;
}

.btn--block {
  width: 100%;
}

/* Hero */
.hero {
  position: relative;
  padding: 4rem 0 5rem;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto;
  height: 70%;
  background: radial-gradient(ellipse at 30% 20%, rgba(115, 115, 115, 0.12), transparent 60%),
    radial-gradient(ellipse at 80% 10%, rgba(38, 38, 38, 0.08), transparent 50%);
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--terra-500);
  background: var(--terra-100);
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.25rem);
  font-weight: 800;
  margin-bottom: 1rem;
}

.hero h1 span {
  background: linear-gradient(135deg, var(--terra-900), var(--terra-500));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  font-size: 1.15rem;
  color: var(--terra-700);
  max-width: 32rem;
  margin-bottom: 1.75rem;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2.5rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.hero-stats li strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--terra-500);
}

.hero-stats li span {
  font-size: 0.9rem;
  color: var(--terra-600);
}

.hero-visual {
  position: relative;
}

.phone-mock {
  background: linear-gradient(160deg, var(--terra-800), var(--terra-900));
  border-radius: 2rem;
  padding: 1rem;
  box-shadow: var(--shadow);
  max-width: 320px;
  margin-inline: auto;
}

.phone-screen {
  background: var(--white);
  border-radius: 1.25rem;
  padding: 1.25rem;
  min-height: 380px;
}

.qr-demo-wrap {
  position: relative;
  width: 148px;
  margin: 0 auto 1rem;
}

.qr-demo-img {
  display: block;
  width: 140px;
  height: 140px;
  margin: 0 auto;
  padding: 6px;
  background: var(--white);
  border: 3px solid var(--terra-800);
  border-radius: 10px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
}

.qr-demo-wrap::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  top: 12px;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--terra-500), transparent);
  border-radius: 2px;
  animation: scan-line 2.8s ease-in-out infinite;
  pointer-events: none;
}

@keyframes scan-line {
  0%, 100% { top: 12px; opacity: 0.4; }
  50% { top: 125px; opacity: 1; }
}

@keyframes scan {
  0%, 100% { opacity: 0.3; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1); }
}

.mock-equipment-label {
  text-align: center;
  font-weight: 700;
  margin: 0 0 0.75rem;
  color: var(--terra-800);
  font-size: 0.9rem;
}

.mock-meta {
  font-size: 0.85rem;
  text-align: center;
  color: var(--terra-600);
  margin: 0.75rem 0 0;
  line-height: 1.4;
}

.mock-actions {
  display: grid;
  gap: 0.6rem;
}

.mock-btn {
  padding: 0.65rem 1rem;
  border-radius: 10px;
  background: var(--terra-100);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--terra-800);
  text-align: center;
}

.mock-btn--accent {
  background: linear-gradient(135deg, var(--terra-700), var(--terra-900));
  color: var(--white);
}

/* Sections */
.section {
  padding: 5rem 0;
}

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

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3rem;
}

.section-header h2 {
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  margin-bottom: 0.75rem;
}

.section-header p {
  color: var(--terra-600);
  margin: 0;
}

/* Features grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: var(--white);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: box-shadow var(--transition), transform var(--transition);
}

.feature-card:hover {
  box-shadow: var(--shadow-sm);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--terra-100);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 1rem;
}

.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.feature-card p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--terra-600);
}

/* QR section */
.qr-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.steps {
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
  counter-reset: step;
}

.steps li {
  position: relative;
  padding-left: 3rem;
  margin-bottom: 1.5rem;
  counter-increment: step;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--terra-500);
  color: var(--white);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Benefits */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.benefit-item {
  display: flex;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--terra-50);
  border-radius: var(--radius);
  border: 1px solid rgba(0, 0, 0, 0.06);
}

.benefit-item svg {
  flex-shrink: 0;
  color: var(--terra-500);
}

/* FAQ */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.faq-item button {
  width: 100%;
  text-align: left;
  padding: 1.25rem 2.5rem 1.25rem 0;
  border: none;
  background: none;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--terra-900);
  cursor: pointer;
  position: relative;
}

.faq-item button::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  color: var(--terra-500);
  transition: transform var(--transition);
}

.faq-item.is-open button::after {
  content: "−";
}

.faq-answer {
  display: none;
  padding-bottom: 1.25rem;
  color: var(--terra-600);
}

.faq-item.is-open .faq-answer {
  display: block;
}

/* Contact */
.contact-section {
  background: linear-gradient(165deg, var(--terra-800), var(--terra-900));
  color: var(--terra-100);
  border-radius: var(--radius-lg);
  margin: 0 1rem 5rem;
  max-width: calc(1120px + 2rem);
  margin-inline: auto;
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  padding: 3rem;
}

.contact-section h2 {
  color: var(--white);
}

.contact-section p {
  color: var(--terra-200);
}

.contact-form {
  background: var(--white);
  border-radius: var(--radius);
  padding: 1.75rem;
  color: var(--terra-800);
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: 10px;
  font-family: inherit;
  font-size: 1rem;
  background: var(--terra-50);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--terra-500);
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.1);
}

.form-group textarea {
  min-height: 100px;
  resize: vertical;
}

.form-error {
  font-size: 0.85rem;
  color: #c0392b;
  margin-top: 0.25rem;
}

.form-message {
  padding: 0.85rem 1rem;
  border-radius: 10px;
  margin-bottom: 1rem;
  font-size: 0.95rem;
  display: none;
}

.form-message.is-visible {
  display: block;
}

.form-message--success {
  background: #e8f5e9;
  color: #2e7d32;
}

.form-message--error {
  background: #ffebee;
  color: #c62828;
}

/* Footer */
.site-footer {
  background: var(--terra-900);
  color: var(--terra-200);
  padding-top: 3rem;
}

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

.footer-tagline {
  margin-top: 0.75rem;
  max-width: 280px;
  font-size: 0.95rem;
}

.brand--footer {
  color: var(--white);
}

.footer-heading {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--terra-300);
  margin-bottom: 0.75rem;
}

.footer-nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-nav a {
  color: var(--terra-200);
  text-decoration: none;
}

.footer-nav a:hover {
  color: var(--white);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 1.25rem 0;
  font-size: 0.9rem;
  color: var(--terra-400);
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid,
  .qr-section,
  .contact-grid,
  .benefits-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-h) 0 auto;
    background: var(--terra-50);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    padding: 1rem;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }

  .site-nav .btn {
    text-align: center;
    margin-top: 0.5rem;
  }

  .contact-section {
    margin-inline: 1rem;
  }

  .contact-grid {
    padding: 2rem 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}