:root {
  --paper: #FAF9F3;
  --paper-deep: #F1EFE4;
  --grid-line: #DDDCD5;
  --margin-line: #EBC9C2;
  --ink: #171717;
  --ink-soft: #4A4A46;
  --ink-faint: #8C8C84;
  --yellow: #FFD84D;
  --yellow-deep: #E9B93A;
  --green: #39C982;
  --red: #EF5C5C;
  --blue: #3F8CFF;
  --shadow: rgba(23,23,23,0.15);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

.margin-line {
  position: fixed;
  left: 48px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--margin-line);
  z-index: 0;
  pointer-events: none;
}

.wrap {
  position: relative;
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 24px 80px;
  z-index: 1;
}

nav.top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

nav.top img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 2px solid var(--ink);
}

nav.top .title {
  font-weight: 800;
  font-size: 20px;
}

nav.top .links {
  margin-left: auto;
  display: flex;
  gap: 20px;
}

nav.top .links a {
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}

nav.top .links a:hover { color: var(--ink); text-decoration: underline; }

h1 {
  font-size: 40px;
  font-weight: 800;
  margin: 0 0 8px;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 24px;
  font-weight: 800;
  margin: 40px 0 12px;
}

h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 24px 0 8px;
}

p { color: var(--ink-soft); }

.tagline {
  font-size: 19px;
  color: var(--ink-soft);
  margin: 0 0 28px;
}

.underline {
  width: 140px;
  height: 6px;
  background: var(--yellow);
  border-radius: 3px;
  margin: 0 0 20px;
  transform: rotate(-1deg);
}

.card {
  background: #fff;
  border: 2px solid var(--ink);
  border-radius: 18px;
  box-shadow: 4px 5px 0 var(--shadow);
  padding: 24px;
  margin: 20px 0;
}

.hero-img {
  width: 100%;
  border-radius: 16px;
  border: 2px solid var(--ink);
  box-shadow: 4px 5px 0 var(--shadow);
  margin: 24px 0 8px;
}

.badges {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 20px 0;
}

.badge {
  background: #fff;
  border: 2px solid var(--ink);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 14px;
  font-weight: 700;
}

.screens {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding: 8px 0 16px;
}

.screens img {
  height: 380px;
  border-radius: 14px;
  border: 2px solid var(--ink);
  box-shadow: 3px 4px 0 var(--shadow);
  flex-shrink: 0;
}

.btn {
  display: inline-block;
  background: var(--yellow);
  border: 2px solid var(--ink);
  border-radius: 999px;
  padding: 12px 28px;
  font-weight: 800;
  color: var(--ink);
  text-decoration: none;
  box-shadow: 3px 4px 0 var(--shadow);
}

a { color: var(--blue); }

footer {
  margin-top: 60px;
  padding-top: 24px;
  border-top: 2px dashed var(--grid-line);
  color: var(--ink-faint);
  font-size: 14px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

footer a { color: var(--ink-soft); }

ul { color: var(--ink-soft); }
li { margin-bottom: 6px; }

.meta {
  color: var(--ink-faint);
  font-size: 14px;
  margin-bottom: 32px;
}

@media (max-width: 600px) {
  h1 { font-size: 30px; }
  .margin-line { left: 16px; }
  .wrap { padding: 24px 16px 60px; }
}