/* StumbleBots. System fonts, one accent, no external resources. */
:root {
  --ink: #1c2430;
  --muted: #5a6675;
  --accent: #0b7285;
  --accent-ink: #ffffff;
  --paper: #fbfaf7;
  --card: #ffffff;
  --line: #e3ddd2;
  --soft: #f1ede4;
  --radius: 14px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); }
.sr { position: absolute; left: -9999px; }

.site-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 22px; max-width: 1120px; margin: 0 auto;
}
.brand { font-weight: 800; font-size: 1.3rem; color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
.site-head nav a { margin-left: 18px; text-decoration: none; font-weight: 600; }

main { max-width: 1120px; margin: 0 auto; padding: 0 22px 40px; }

.hero { text-align: center; padding: 34px 10px 10px; }
.hero h1 { font-size: 2.4rem; line-height: 1.15; margin: 0 0 12px; letter-spacing: -0.02em; }
.hero .sub { max-width: 640px; margin: 0 auto 20px; color: var(--muted); font-size: 1.08rem; }

.big-btn {
  background: var(--accent); color: var(--accent-ink); border: 0; cursor: pointer;
  font-size: 1rem; font-weight: 700; padding: 12px 26px; border-radius: 999px;
}
.big-btn:hover { filter: brightness(1.08); }
.link-btn { display: inline-block; text-decoration: none; }

.controls { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin: 26px 0 18px; }
.controls input[type="search"] {
  flex: 1 1 260px; padding: 12px 14px; font-size: 1rem;
  border: 1px solid var(--line); border-radius: 10px; background: #fff; color: var(--ink);
}
.chips { display: flex; gap: 8px; }
.chip {
  border: 1px solid var(--line); background: #fff; color: var(--ink);
  padding: 9px 18px; border-radius: 999px; font-size: 0.95rem; font-weight: 600; cursor: pointer;
}
.chip.active { background: var(--ink); color: #fff; border-color: var(--ink); }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; display: flex; flex-direction: column; gap: 8px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(28, 36, 48, 0.10); }
.card.highlight { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(11, 114, 133, 0.35); }
.card h2 { margin: 0; font-size: 1.3rem; letter-spacing: -0.01em; }
.card .hook { margin: 0; font-weight: 600; }
.card .teaser { margin: 0; color: var(--muted); font-style: italic; font-size: 0.95rem; }
.card-actions { margin-top: auto; padding-top: 10px; display: flex; gap: 14px; align-items: center; }
.card-link { font-weight: 600; text-decoration: none; }

.tags { margin: 0; }
.tag {
  display: inline-block; font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.05em; background: var(--soft); color: var(--muted);
  border-radius: 999px; padding: 3px 10px;
}
.tag-cat { background: var(--accent); color: #fff; }

.copy-btn {
  background: var(--ink); color: #fff; border: 0; cursor: pointer;
  font-weight: 700; font-size: 0.92rem; padding: 10px 18px; border-radius: 999px;
}
.copy-btn:hover { background: var(--accent); }
.copy-btn:disabled { opacity: 0.75; cursor: default; }

.block {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; margin: 22px 0;
}
.block h2 { margin-top: 0; }
.block-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.block-head h2 { margin: 0; }
.hint { color: var(--muted); margin: 6px 0 12px; }
.gate { border-left: 5px solid var(--accent); }

pre.code, pre.sample {
  background: #141a21; color: #eef2f5; border-radius: 10px;
  padding: 16px; overflow-x: auto; white-space: pre-wrap; word-wrap: break-word;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88rem; line-height: 1.5; margin: 0;
}
pre.sample { background: var(--soft); color: var(--ink); }

.bot-page { max-width: 820px; }
.bot-page h1 { font-size: 2.1rem; margin: 6px 0 8px; letter-spacing: -0.02em; }
.what { font-size: 1.12rem; }
.crumb a { text-decoration: none; font-weight: 600; }

.signup form, .submit-form { display: flex; flex-direction: column; gap: 12px; }
.signup form { flex-direction: row; flex-wrap: wrap; align-items: center; }
.signup input[type="email"] {
  flex: 1 1 240px; padding: 12px 14px; font-size: 1rem;
  border: 1px solid var(--line); border-radius: 10px;
}
.form-msg { color: var(--accent); font-weight: 600; margin: 4px 0 0; flex-basis: 100%; }
.submit-form label { display: flex; flex-direction: column; gap: 6px; font-weight: 600; }
.submit-form input, .submit-form textarea, .submit-form select {
  padding: 11px 12px; font-size: 1rem; font-family: inherit;
  border: 1px solid var(--line); border-radius: 10px; background: #fff; color: var(--ink);
}
.submit-form .big-btn { align-self: flex-start; }

.noresults { text-align: center; color: var(--muted); padding: 26px 0; }

.site-foot {
  border-top: 1px solid var(--line); margin-top: 12px;
  padding: 22px; text-align: center; color: var(--muted); font-size: 0.92rem;
}
.site-foot p { max-width: 720px; margin: 0 auto; }

@media (max-width: 640px) {
  .hero h1 { font-size: 1.8rem; }
  .grid { grid-template-columns: 1fr; }
  .controls { flex-direction: column; align-items: stretch; }
  .chips { justify-content: center; }
  .site-head { padding: 14px 16px; }
  main { padding: 0 14px 32px; }
  .block { padding: 16px; }
  .bot-page h1 { font-size: 1.7rem; }
  pre.code, pre.sample { font-size: 0.82rem; padding: 13px; }
}