* {
  box-sizing: border-box;
}

:root {
  --background: #f3f4f6;
  --surface: #ffffff;
  --text: #242832;
  --muted: #707784;
  --border: #dfe2e8;
  --accent: #315ed8;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font: 15px/1.6 Arial, Helvetica, sans-serif;
}

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

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 960px;
  min-height: 64px;
  margin: auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 19px;
  font-weight: bold;
}

nav {
  display: flex;
  gap: 24px;
  color: var(--muted);
}

nav a:hover {
  color: var(--accent);
}

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 36px 20px 60px;
}

.intro {
  padding: 25px 0 35px;
}

.eyebrow {
  color: var(--accent);
  font-size: 11px;
  font-weight: bold;
  letter-spacing: 2px;
}

h1 {
  margin: 8px 0;
  font-size: 36px;
  letter-spacing: -1px;
}

.intro > p:last-child {
  color: var(--muted);
  margin: 0;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 14px;
}

.section-heading h2,
.about h2 {
  font-size: 19px;
  margin: 0;
}

.section-heading span {
  color: var(--muted);
  font-size: 13px;
}

.file-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.file-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 18px;
  transition: border-color 0.15s;
}

.file-card:hover {
  border-color: #aebce0;
}

.file-icon {
  width: 52px;
  height: 58px;
  flex-shrink: 0;
  overflow: hidden;
  border-radius: 6px;
}

.file-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.file-icon.pdf {
  background: #ffebeb;
  color: #c33a3a;
}

.file-icon.exe {
  background: #e2f5e9;
  color: #21834a;
}

.file-info {
  flex: 1;
  min-width: 0;
}

.file-info h3 {
  margin: 0 0 4px;
  font-size: 16px;
}

.file-info p {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 13px;
}

.file-meta {
  display: flex;
  gap: 14px;
  color: var(--muted);
  font-size: 12px;
}

.download-button {
  display: inline-block;
  flex-shrink: 0;
  padding: 9px 15px;
  background: var(--accent);
  color: white;
  border-radius: 5px;
  font-size: 13px;
  font-weight: bold;
  text-align: center;
}

.download-button:hover {
  background: #2449b2;
}

.download-button:focus-visible,
a:focus-visible {
  outline: 3px solid #91aaff;
  outline-offset: 3px;
}

.about {
  margin-top: 36px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.about p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

footer {
  padding: 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

@media (max-width: 560px) {
  h1 {
    font-size: 30px;
  }

  .file-card {
    flex-wrap: wrap;
    gap: 12px;
  }

  .file-icon {
    width: 44px;
    height: 50px;
  }

  .file-info {
    width: calc(100% - 60px);
    flex: initial;
  }

  .download-button {
    width: 100%;
  }

  nav {
    gap: 14px;
    font-size: 13px;
  }
}