/* The If Statement — verified cheat sheets. System fonts, light+dark, print-ready. */

:root {
  --bg: #f6f6f3;
  --bg-glow: rgba(14, 138, 95, 0.06);
  --surface: #ffffff;
  --surface-2: #f0f1ee;
  --text: #191c21;
  --muted: #71767f;
  --accent: #0e8a5f;
  --accent-2: #0a6e77;
  --border: #e4e5e1;
  --shadow-sm: 0 1px 2px rgba(22, 26, 33, 0.06);
  --shadow-md: 0 2px 10px rgba(22, 26, 33, 0.08);
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0e14;
    --bg-glow: rgba(61, 220, 151, 0.05);
    --surface: #151a23;
    --surface-2: #1d2430;
    --text: #e9ebef;
    --muted: #8d95a3;
    --accent: #3ddc97;
    --accent-2: #37b8c4;
    --border: #252c38;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
    --shadow-md: 0 2px 12px rgba(0, 0, 0, 0.45);
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: radial-gradient(60rem 22rem at 50% -8rem, var(--bg-glow), transparent 70%), var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.65;
}
main { max-width: 860px; margin: 0 auto; padding: 24px 20px 70px; }

/* header */
.top { display: flex; align-items: baseline; gap: 14px; padding: 6px 0 14px; border-bottom: 1px solid var(--border); }
.mark { font-family: var(--mono); font-weight: 700; font-size: 1.15rem; text-decoration: none; color: var(--text); }
.mark b {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.mark span { color: var(--muted); font-weight: 400; }
.top-note { font-size: 0.82rem; color: var(--muted); }
.top-badge {
  margin-left: auto; font-size: 0.7rem; color: var(--muted);
  border: 1px solid var(--border); border-radius: 999px; padding: 3px 10px; white-space: nowrap;
}

/* hero */
.hero { padding: 40px 0 8px; }
.hero h1 { font-size: 2.1rem; line-height: 1.2; margin: 0 0 10px; letter-spacing: -0.01em; }
.hero p { margin: 0; color: var(--muted); max-width: 46rem; font-size: 1.02rem; }

/* sheet cards */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; padding: 26px 0; }
.card {
  display: block; text-decoration: none; color: var(--text);
  background: var(--surface); border: 1px solid var(--border); border-radius: 16px;
  padding: 18px 18px 15px; box-shadow: var(--shadow-sm);
  transition: transform 0.12s, box-shadow 0.15s, border-color 0.15s;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: var(--accent); }
.card h2 { margin: 0 0 6px; font-size: 1.05rem; }
.card p { margin: 0 0 10px; font-size: 0.86rem; color: var(--muted); line-height: 1.5; }
.card .count { font-size: 0.72rem; color: var(--accent); font-weight: 600; }

/* sheet page */
.sheet-head { padding: 30px 0 4px; }
.sheet-head h1 { font-size: 1.7rem; margin: 0 0 6px; }
.sheet-head .tagline { color: var(--muted); margin: 0 0 10px; }
.badge {
  display: inline-block; font-size: 0.72rem; color: var(--muted);
  border: 1px solid var(--border); border-radius: 999px; padding: 2px 10px; margin-right: 6px;
}
.toolbar { padding: 10px 0 4px; display: flex; gap: 10px; }
.btn {
  font: inherit; font-size: 0.84rem; font-weight: 600; cursor: pointer; text-decoration: none;
  border: 1px solid var(--border); background: var(--surface); color: var(--accent);
  border-radius: 999px; padding: 7px 15px; box-shadow: var(--shadow-sm);
}
.btn:hover { border-color: var(--accent); }

.entry {
  background: var(--surface); border: 1px solid var(--border); border-radius: 16px;
  padding: 18px 20px; margin: 14px 0; box-shadow: var(--shadow-sm);
}
.entry h3 { margin: 0 0 8px; font-size: 1.02rem; }
.entry h3 a { color: inherit; text-decoration: none; }
.entry h3 a:hover { color: var(--accent); }
.entry pre {
  margin: 0 0 10px; padding: 11px 13px; background: var(--surface-2);
  border-left: 3px solid var(--accent); border-radius: 10px;
  font-family: var(--mono); font-size: 0.83rem; line-height: 1.5; overflow-x: auto;
}
.entry .plain { margin: 0 0 8px; }
.entry .tech { margin: 0; font-size: 0.88rem; color: var(--muted); }
.entry .tech b { color: var(--accent); font-weight: 600; }

/* facts index */
ul.idx { list-style: none; padding: 6px 0; }
ul.idx li { margin: 9px 0; }
ul.idx a { color: var(--text); text-decoration: none; border-bottom: 1px dotted var(--border); }
ul.idx a:hover { color: var(--accent); }
.search {
  width: 100%; max-width: 26rem; border: 1px solid var(--border); background: var(--surface);
  color: var(--text); border-radius: 12px; padding: 11px 14px; font: inherit; font-size: 0.93rem;
  outline: none; box-shadow: var(--shadow-sm); margin-top: 14px;
}
.search:focus { border-color: var(--accent); }

/* fact page */
article h1 { font-size: 1.5rem; line-height: 1.3; margin: 26px 0 6px; }
article h2 { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent); margin: 24px 0 6px; }
article pre {
  background: var(--surface-2); border-left: 3px solid var(--accent); border-radius: 10px;
  padding: 12px 14px; font-family: var(--mono); font-size: 0.85rem; overflow-x: auto;
}
blockquote { margin: 8px 0; padding: 12px 16px; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; }
.cta {
  display: inline-block; margin-top: 24px; padding: 11px 18px; border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; text-decoration: none; font-weight: 600; font-size: 0.92rem;
}
@media (prefers-color-scheme: dark) { .cta { color: #0b0e14; } }

footer { margin-top: 44px; padding-top: 14px; border-top: 1px solid var(--border); font-size: 0.75rem; color: var(--muted); display: flex; gap: 10px; flex-wrap: wrap; }
footer a { color: var(--muted); }
footer a:hover { color: var(--accent); }

@media (max-width: 520px) { .top-note, .top-badge { display: none; } .hero h1 { font-size: 1.6rem; } }

/* parked state */
.parked {
  min-height: 90dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 14px;
  padding: 24px;
}
.parked .mark { font-size: 2rem; }
.parked p { margin: 0; color: var(--text); font-size: 1.05rem; max-width: 34rem; }
.parked .parked-note { color: var(--muted); font-size: 0.85rem; }

/* print: a sheet becomes a clean handout */
@media print {
  .top, .toolbar, footer, .cta, .search { display: none !important; }
  body { background: #fff; color: #000; font-size: 11.5px; }
  .entry { break-inside: avoid; border: 1px solid #ddd; box-shadow: none; margin: 8px 0; padding: 10px 12px; }
  .entry pre { border-left: 2px solid #999; background: #f5f5f5; }
  .sheet-head h1 { font-size: 1.3rem; }
}