html {
  scroll-behavior: smooth;
  scroll-padding-top: 3rem;
}

body {
  min-width: 320px;
}

#philosophy,
#use-cases,
#how-it-works,
#tiers,
#contact {
  scroll-margin-top: 3rem;
}

.section-shell {
  margin-inline: auto;
  width: 100%;
  max-width: 80rem;
  padding-inline: 1rem;
}

@media (min-width: 640px) {
  .section-shell {
    padding-inline: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .section-shell {
    padding-inline: 2rem;
  }
}

.section-divider {
  border-top: 1px solid #e8edf5;
}

.section-title {
  font-size: clamp(2rem, 3vw, 3.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.05em;
  color: #14161c;
}

.btn-primary {
  min-height: 3.75rem;
  align-items: center;
  border-radius: 1rem;
  background: linear-gradient(135deg, #2f6df6 0%, #4f86ff 100%);
  padding-inline: 2rem;
  font-size: 1.125rem;
  font-weight: 700;
  color: #fff;
  box-shadow: 0 14px 30px rgba(47, 109, 246, 0.25);
  transition: transform 180ms ease, box-shadow 180ms ease, opacity 180ms ease;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 16px 34px rgba(47, 109, 246, 0.3);
}

.btn-primary:focus-visible,
.btn-secondary:focus-visible,
.contact-pill:focus-visible {
  outline: 3px solid rgba(79, 134, 255, 0.25);
  outline-offset: 3px;
}

.btn-primary[disabled] {
  cursor: wait;
  opacity: 0.72;
  transform: none;
}

.btn-secondary {
  min-height: 3.5rem;
  align-items: center;
  justify-content: center;
  border-radius: 1rem;
  border: 1px solid #a8c4ff;
  background: #fff;
  padding-inline: 1.75rem;
  font-size: 1.125rem;
  font-weight: 600;
  color: #2f6df6;
  transition: background-color 180ms ease, color 180ms ease;
}

.btn-secondary:hover {
  background: #eef4ff;
}

.avatar {
  display: block;
  height: 3rem;
  width: 3rem;
  border-radius: 9999px;
  object-fit: cover;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.55);
}

.side-card,
.timeline-card,
.feature-card,
.tier-card,
.phone-card {
  border: 1px solid #e8edf5;
  background: #fff;
  box-shadow: 0 16px 40px rgba(31, 53, 103, 0.08);
}

.side-card {
  border-radius: 1.5rem;
  padding: 1.4rem 1.5rem;
}

.status-chip {
  display: inline-flex;
  border-radius: 9999px;
  padding: 0.35rem 0.8rem;
  font-size: 0.875rem;
  font-weight: 600;
}

.bullet-item,
.check-item {
  position: relative;
  padding-left: 1.4rem;
}

.bullet-item::before,
.check-item::before {
  position: absolute;
  left: 0;
  top: 0.7rem;
  height: 0.5rem;
  width: 0.5rem;
  border-radius: 9999px;
  content: "";
}

.bullet-item::before {
  background: #4f86ff;
}

.check-item::before {
  background: #e7f0ff;
  box-shadow: inset 0 0 0 2px #8fb4ff;
}

.timeline-card {
  position: relative;
  border-radius: 1.75rem;
  padding: 1.75rem 2rem;
}

.timeline-dot {
  position: absolute;
  left: -2.1rem;
  top: 1.5rem;
  height: 1rem;
  width: 1rem;
  border-radius: 9999px;
  background: #4f86ff;
  box-shadow: 0 0 0 6px rgba(79, 134, 255, 0.12);
}

.hero-timeline {
  position: relative;
}

.hero-timeline-item {
  position: relative;
}

.hero-timeline-card {
  padding: 1.35rem 1.25rem 1.35rem 1.4rem;
}

.hero-timeline-icon {
  display: inline-flex;
  height: 3rem;
  width: 3rem;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border-radius: 9999px;
}

.feature-card {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  border-radius: 1.75rem;
  padding: 1.5rem;
}

.feature-card-arrow::after {
  position: absolute;
  left: -1.25rem;
  top: 50%;
  color: #b9c7df;
  content: "→";
  font-size: 2rem;
  transform: translateY(-50%);
}

.feature-icon,
.tier-icon,
.contact-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border-radius: 9999px;
}

.feature-icon {
  height: 4.5rem;
  width: 4.5rem;
}

.feature-title {
  font-size: 1.65rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.04em;
  color: #14161c;
}

.feature-copy {
  margin-top: 0.5rem;
  font-size: 1.125rem;
  line-height: 1.8;
  color: #6d7687;
}

.tier-card {
  border-radius: 1.75rem;
  padding: 1.6rem;
}

.tier-icon {
  height: 4.75rem;
  width: 4.75rem;
}

.phone-card {
  border-radius: 1.75rem;
  background: linear-gradient(180deg, #f8fbff 0%, #f5f8fc 100%);
  padding: 1.25rem;
}

.chat-bubble,
.noise-card {
  border-radius: 1rem;
  background: #fff;
  padding: 0.9rem 1rem;
  font-size: 0.95rem;
  color: #475062;
  box-shadow: 0 10px 25px rgba(31, 53, 103, 0.06);
}

.chat-bubble span,
.noise-card span {
  float: right;
  margin-left: 0.75rem;
  color: #a1a8b5;
  font-size: 0.75rem;
}

.noise-card .noise-amount {
  color: #475062;
  font-size: 0.95rem;
  font-weight: 600;
}

.noise-card-transfer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.noise-card-transfer .noise-label,
.noise-card-transfer .noise-amount {
  float: none;
  margin-left: 0;
}

.chat-bubble-right {
  margin-left: 2rem;
  background: #e9f8e8;
}

.contact-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.85rem;
  border-radius: 1rem;
  border: 1px solid #a8c4ff;
  padding: 1rem 1.2rem;
  font-size: 1.125rem;
  font-weight: 500;
  color: #4f86ff;
  transition: background-color 180ms ease;
}

.contact-pill:hover {
  background: #f7faff;
}

.contact-icon {
  height: 2rem;
  width: 2rem;
  font-size: 0.95rem;
  font-weight: 800;
}

@media (max-width: 1023px) {
  .feature-card-arrow::after {
    display: none;
  }

  .timeline-dot {
    left: 1.25rem;
  }
}

@media (max-width: 639px) {
  .btn-primary,
  .btn-secondary {
    width: 100%;
    justify-content: center;
  }

  .timeline-card {
    padding: 1.4rem 1.25rem 1.4rem 2.4rem;
  }

  .timeline-dot {
    left: 0.85rem;
  }

  .hero-timeline-card {
    padding: 1.25rem 1.15rem 1.25rem 1.2rem;
  }
}