* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  line-height: 1.5;
  color: #1f2937;
  background: #f5f7fb;
}

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

header,
main,
footer {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
}

nav {
  display: flex;
  gap: 20px;
}

main {
  padding: 32px 0 64px;
}

section {
  margin-bottom: 48px;
}

#hero {
  padding: 48px;
  border-radius: 24px;
  background: #ffffff;
}

#hero h1 {
  max-width: 12ch;
  margin: 12px 0 16px;
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  line-height: 0.95;
}

#hero p {
  max-width: 56ch;
}

#hero a {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 18px;
  border-radius: 999px;
  background: #0f172a;
  color: #ffffff;
}

#features,
#roadmap_public,
footer {
  padding: 32px;
  border-radius: 24px;
  background: #ffffff;
}

#features article + article {
  margin-top: 20px;
}

ol {
  padding-left: 20px;
}

footer {
  margin-bottom: 48px;
}

.timeline {
  position: relative;
  margin-top: 28px;
  padding-left: 40px;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 18px;
  width: 4px;
  border-radius: 999px;
  background: linear-gradient(
    to bottom,
    #2563eb 0%,
    #2563eb 50%,
    #cbd5e1 50%,
    #cbd5e1 100%
  );
}

.timeline-item {
  position: relative;
  padding-bottom: 28px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  top: 50%;
  left: -32px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 4px solid #2563eb;
  background: #ffffff;
  transform: translateY(-50%);
}

.timeline-item.past .timeline-marker,
.timeline-item.present .timeline-marker {
  background: #2563eb;
}

.timeline-item.future .timeline-marker {
  background: #ffffff;
  border-color: #94a3b8;
}

.timeline-card {
  padding: 20px 22px;
  border: 1px solid #dbe2ea;
  border-radius: 18px;
  background: #f8fbff;
}

.timeline-item.future .timeline-card {
  background: #ffffff;
  border: 2px solid #cbd5e1;
}

.timeline-date {
  margin: 0 0 8px;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #2563eb;
}

.timeline-card h3 {
  margin: 0 0 8px;
}

.timeline-card p:last-child {
  margin-bottom: 0;
}