:root {
  --primary: #0d9488;
  --primary-dark: #0f766e;
  --primary-darker: #134e4a;
  --teal-50: #f0fdfa;
  --teal-100: #ccfbf1;
  --teal-200: #99f6e4;
  --text-dark: #0f172a;
  --text-muted: #64748b;
  --radius: 0.5rem;
  --max-width: 1180px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text-dark);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg {
  max-width: 100%;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 8px 20px rgba(13, 148, 136, 0.25);
}

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

.btn-outline {
  background: transparent;
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.12);
}

.btn-outline-dark {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid var(--primary);
}

.btn-outline-dark:hover {
  background: var(--teal-50);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid #e5e7eb;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-dark);
}

.brand .logo-icon {
  width: 30px;
  height: 30px;
  color: var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a:not(.btn) {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.nav-links a:not(.btn):hover {
  color: var(--primary);
}

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

.nav-actions .btn-outline-dark {
  padding: 10px 20px;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 55%, var(--primary-darker) 100%);
  color: #fff;
  padding: 96px 0 110px;
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.hero::before {
  width: 420px;
  height: 420px;
  top: -160px;
  right: -120px;
}

.hero::after {
  width: 280px;
  height: 280px;
  bottom: -140px;
  left: -80px;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 48px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2.2rem, 4.2vw, 3.2rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
}

.hero h1 span {
  color: #99f6e4;
}

.hero p.lead {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.9);
  max-width: 520px;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.hero-subnote {
  margin-top: 18px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
}

.hero-actions .btn {
  gap: 8px;
}

/* Hero visual */
.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 380px;
}

.visual-blob {
  position: absolute;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.04));
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.phone-mock {
  position: relative;
  z-index: 1;
  width: 290px;
  background: #fff;
  border-radius: 20px;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.25);
  overflow: hidden;
}

.phone-mock-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px;
  background: var(--primary-darker);
  color: #fff;
}

.phone-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}

.phone-name {
  font-size: 0.9rem;
  font-weight: 600;
}

.phone-status {
  font-size: 0.75rem;
  color: #99f6e4;
}

.phone-mock-body {
  padding: 18px;
  background: #f0fdfa;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chat-bubble {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: 12px;
  font-size: 0.82rem;
  line-height: 1.4;
}

.chat-bubble.in {
  align-self: flex-start;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-bottom-left-radius: 2px;
}

.chat-bubble.out {
  align-self: flex-end;
  background: var(--primary);
  color: #fff;
  border-bottom-right-radius: 2px;
}

.chat-bubble.ai {
  background: var(--primary-darker);
  position: relative;
  padding-top: 22px;
}

.ai-tag {
  position: absolute;
  top: 6px;
  left: 14px;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #99f6e4;
}

.floating-card {
  position: absolute;
  bottom: 18px;
  left: -10px;
  z-index: 2;
  background: #fff;
  color: var(--text-dark);
  border-radius: 999px;
  padding: 10px 18px;
  font-size: 0.82rem;
  font-weight: 600;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.18);
  display: flex;
  align-items: center;
  gap: 8px;
}

.floating-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22c55e;
}

/* Sections */
section {
  padding: 88px 0;
}

/* Why strip */
.why-strip {
  padding: 28px 0;
  background: #fff;
  border-bottom: 1px solid #e5e7eb;
}

.why-grid {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 36px;
  flex-wrap: wrap;
}

.why-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-dark);
}

.why-icon {
  display: flex;
  color: var(--primary);
  flex-shrink: 0;
}

/* FAQ */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: var(--radius);
  padding: 18px 22px;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  list-style: none;
  position: relative;
  padding-right: 28px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 0;
  font-size: 1.2rem;
  color: var(--primary);
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  content: "\2212";
}

.faq-item p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-top: 12px;
}

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

.section-tag {
  display: inline-block;
  color: var(--primary);
  background: var(--teal-50);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 12px;
}

.section-header p {
  color: var(--text-muted);
  font-size: 1.05rem;
}

/* Features grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.feature-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  padding: 32px 28px;
  transition: all 0.2s ease;
}

.feature-card:hover {
  border-color: var(--primary);
  box-shadow: 0 12px 28px rgba(13, 148, 136, 0.12);
  transform: translateY(-3px);
}

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--teal-50);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.feature-card-highlight {
  background: linear-gradient(160deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-color: transparent;
  color: #fff;
}

.feature-card-highlight .feature-icon {
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
}

.feature-card-highlight h3 {
  color: #fff;
}

.feature-card-highlight p {
  color: rgba(255, 255, 255, 0.85);
}

.feature-card-highlight:hover {
  border-color: transparent;
  box-shadow: 0 16px 32px rgba(13, 148, 136, 0.3);
}

/* How it works */
.how-it-works {
  background: #f8fafc;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.step {
  text-align: center;
  position: relative;
}

.step-number {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}

.step h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step p {
  color: var(--text-muted);
  font-size: 0.95rem;
  max-width: 280px;
  margin: 0 auto;
}

/* Pricing */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  max-width: 760px;
  margin: 0 auto;
}

.pricing-card {
  position: relative;
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 36px 32px;
  text-align: center;
}

.pricing-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.pricing-card .price {
  margin-bottom: 4px;
}

.pricing-card .amount {
  font-size: 2.4rem;
  font-weight: 800;
}

.pricing-card .period {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.price-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.price-features {
  list-style: none;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.price-features li {
  font-size: 0.9rem;
  padding-left: 26px;
  position: relative;
}

.price-features li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--teal-100);
}

.price-features li::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 6.5px;
  width: 8px;
  height: 5px;
  border-left: 2px solid var(--primary);
  border-bottom: 2px solid var(--primary);
  transform: rotate(-45deg);
}

.pricing-card-highlight {
  border-color: var(--primary);
  box-shadow: 0 16px 40px rgba(13, 148, 136, 0.18);
  transform: scale(1.02);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  right: 24px;
  background: var(--primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 999px;
}

/* Reseller callout */
.reseller {
  background: linear-gradient(135deg, var(--primary-darker) 0%, var(--primary-dark) 100%);
  color: #fff;
  border-radius: 24px;
  margin: 0 24px;
  padding: 64px 40px;
  text-align: center;
}

.reseller .container {
  max-width: 680px;
}

.reseller h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.1rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.reseller p {
  color: rgba(255, 255, 255, 0.88);
  margin-bottom: 32px;
  font-size: 1.05rem;
}

/* CTA footer band */
.cta-band {
  text-align: center;
}

.cta-band h2 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 16px;
}

.cta-band p {
  color: var(--text-muted);
  margin-bottom: 32px;
  font-size: 1.05rem;
}

.cta-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Footer */
.site-footer {
  background: #0f172a;
  color: rgba(255, 255, 255, 0.7);
  padding: 48px 0 28px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 32px;
  margin-bottom: 32px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 700;
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.footer-brand .logo-icon {
  width: 26px;
  height: 26px;
  color: var(--primary);
}

.footer-col p {
  font-size: 0.9rem;
  max-width: 280px;
}

.footer-links h4 {
  color: #fff;
  font-size: 0.95rem;
  margin-bottom: 14px;
}

.footer-links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.65);
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  font-size: 0.85rem;
  text-align: center;
}

/* Responsive */
@media (max-width: 900px) {
  .features-grid,
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero p.lead {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    min-height: 320px;
    margin-top: 24px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: block;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    padding: 20px 24px;
    gap: 18px;
    border-bottom: 1px solid #e5e7eb;
  }

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

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

  .reseller {
    margin: 0 16px;
    padding: 48px 24px;
  }

  .footer-top {
    flex-direction: column;
  }
}