:root {
  --bg: #f3f5f8;
  --card-bg: #ffffff;
  --text: #1f2937;
  --muted: #4b5563;
  --primary: #0b57d0;
  --primary-hover: #0948ac;
  --border: #d9dee6;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top right, #dde8fb 0%, transparent 40%),
    var(--bg);
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 16px;
}

.page-header {
  display: flex;
  justify-content: center;
  margin-bottom: 18px;
}

.brand-logo {
  display: block;
  max-width: min(240px, 55vw);
  width: 100%;
  height: auto;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(1.6rem, 2.5vw, 2rem);
}

h2 {
  margin: 26px 0 10px;
  font-size: 1.1rem;
}

.lead {
  margin: 0 0 20px;
  color: var(--muted);
}

.download-btn {
  display: inline-block;
  padding: 12px 18px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 700;
  color: #fff;
  background: var(--primary);
  transition: background 120ms ease-in-out;
}

.download-btn:hover,
.download-btn:focus-visible {
  background: var(--primary-hover);
}

ol {
  margin: 0;
  padding-left: 20px;
}

li + li {
  margin-top: 8px;
}

.footnote {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.2;
  color: var(--muted);
}

@media (max-width: 640px) {
  .card {
    padding: 22px;
  }
}