:root {
  color-scheme: light;
  --bg: #f6f8fb;
  --surface: #ffffff;
  --ink: #172033;
  --muted: #596579;
  --line: #dfe6ef;
  --blue: #1f6feb;
  --green: #15856f;
  --shadow: 0 18px 40px rgba(20, 29, 45, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Segoe UI", "Apple SD Gothic Neo", Arial, sans-serif;
  line-height: 1.6;
}

a {
  color: inherit;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px clamp(18px, 4vw, 48px);
  border-bottom: 1px solid var(--line);
  background: rgba(246, 248, 251, 0.94);
}

.brand,
.home-link {
  text-decoration: none;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}

.brand-mark,
.app-icon {
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--blue);
  color: #ffffff;
  font-weight: 800;
}

.brand-mark {
  width: 34px;
  height: 34px;
}

.home-link {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

main,
.footer {
  width: min(1040px, calc(100% - 36px));
  margin: 0 auto;
}

.hero {
  padding: clamp(56px, 10vw, 110px) 0 36px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  max-width: 760px;
  margin: 0 0 18px;
  font-size: clamp(40px, 7vw, 68px);
  line-height: 1.05;
  letter-spacing: 0;
}

.lead {
  max-width: 660px;
  margin: 0;
  color: var(--muted);
  font-size: 19px;
}

.manuals {
  display: grid;
  gap: 14px;
  padding: 24px 0 80px;
}

.manual-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
  text-decoration: none;
}

.manual-card:hover {
  border-color: rgba(31, 111, 235, 0.45);
}

.app-icon {
  flex: 0 0 auto;
  width: 48px;
  height: 48px;
}

.manual-card strong,
.manual-card small {
  display: block;
}

.manual-card strong {
  font-size: 19px;
}

.manual-card small {
  color: var(--muted);
  font-size: 14px;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 28px 0 42px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 640px) {
  .topbar,
  .footer {
    align-items: flex-start;
    flex-direction: column;
  }
}