* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  background: linear-gradient(180deg, var(--bg), var(--bg));
  color: var(--text);
  font-family:
    Inter,
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    Arial,
    sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.5vh 2vw;
}
.deck {
  width: min(1100px, 96vw);
}
.card {
  background: radial-gradient(
    1200px 600px at 100% 0%,
    var(--surface-alt) 0%,
    var(--panel) 50%
  );
  border: 1px solid var(--code-bg);
  border-radius: 22px;
  padding: 48px 56px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  min-height: 68vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
h1 {
  font-size: clamp(28px, 4vw, 44px);
  margin: 0 0 18px;
  line-height: 1.12;
  letter-spacing: 0.2px;
}
.content {
  font-size: clamp(18px, 2.2vw, 24px);
  line-height: 1.6;
}
.content p {
  margin: 0 0 12px;
}
.content ul,
.content ol {
  margin: 10px 0 0 0;
  padding-left: 26px;
}
.content li {
  margin: 10px 0;
}
code {
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 6px;
  font-family:
    ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
  font-size: 0.9em;
}
pre {
  background: var(--code-bg);
  padding: 14px 16px;
  border-radius: 12px;
  overflow-x: auto;
}
.nav {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 26px;
}
.nav .spacer {
  flex: 1;
}
button {
  background: var(--primary);
  color: var(--on-accent);
  border: none;
  padding: 14px 22px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 18px;
  cursor: pointer;
}
button[disabled] {
  opacity: 0.5;
  cursor: not-allowed;
}
.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 16px;
}
.bar {
  height: 8px;
  width: 100%;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}
.bar > span {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--primary));
}
.kbhint {
  font-size: 14px;
  color: var(--muted);
}
a {
  color: var(--link);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
@media print {
  body {
    background: #fff;
    color: #111;
  }
  .card {
    box-shadow: none;
    border: 1px solid #ddd;
  }
  .meta,
  .kbhint,
  .nav {
    display: none !important;
  }
  .deck {
    width: 100%;
  }
}

@media (max-width: 600px) {
  body {
    height: auto;
    min-height: 100vh;
    padding-top: 70px;
    align-items: flex-start;
  }
  .card {
    padding: 25px 20px;
  }
  .meta {
    flex-wrap: wrap;
  }
  .nav {
    gap: 8px;
  }
  .nav button {
    padding: 10px;
    font-size: 14px;
  }
}
@media print {
  .card {
    background: white;
    color: black;
  }
}