/* zalmanfriedman.com — one stylesheet, on purpose */

:root {
  --ink: #1c1c1c;
  --muted: #6b6b6b;
  --accent: #1a56db;
  --rule: #e6e4e0;
  --bg: #fdfdfb;
  --card: #ffffff;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  max-width: 760px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
  line-height: 1.65;
  font-size: 17px;
}

h1 { font-size: 2rem; margin: 0 0 0.25rem; letter-spacing: -0.02em; }
h2 { font-size: 1.25rem; margin: 3rem 0 0.75rem; letter-spacing: -0.01em; }
h3 { font-size: 1.05rem; margin: 1.5rem 0 0.5rem; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

p { margin: 0.6rem 0; }

.muted { color: var(--muted); }
.tiny { font-size: 0.82rem; color: var(--muted); }

.tagline { font-size: 1.05rem; color: var(--muted); margin-top: 0; }

.contact-line { margin-top: 0.75rem; font-size: 0.95rem; }
.contact-line a { margin-right: 1rem; }

hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }

/* Back link on subpages */
.back { display: inline-block; margin-bottom: 1.5rem; font-size: 0.9rem; }

/* ---- Chat ---- */
.chat-box {
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--card);
  padding: 1rem;
  margin-top: 0.75rem;
}

#chat-log { display: none; margin-bottom: 0.75rem; max-height: 420px; overflow-y: auto; }
#chat-log.active { display: block; }

.msg { padding: 0.5rem 0.75rem; border-radius: 6px; margin: 0.4rem 0; white-space: pre-wrap; }
.msg.user { background: #eef2fb; }
.msg.bot { background: #f6f5f2; }
.msg.error { background: #fdf0ef; color: #8a2f28; }

.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0.5rem 0 0.75rem; }
.chips button {
  font-size: 0.85rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--bg);
  color: var(--ink);
  cursor: pointer;
}
.chips button:hover { border-color: var(--accent); color: var(--accent); }

#chat-form { display: flex; gap: 0.5rem; }
#chat-form input {
  flex: 1;
  font: inherit;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: #fff;
}
#chat-form input:focus { outline: 2px solid var(--accent); outline-offset: -1px; border-color: transparent; }
#chat-form button {
  font: inherit;
  padding: 0.55rem 1.1rem;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
#chat-form button:disabled { opacity: 0.5; cursor: default; }

/* ---- Greatest hits ---- */
.hits {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 0.75rem;
  padding: 0;
  list-style: none;
}
.hits li {
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--card);
  padding: 0.8rem 1rem;
  font-size: 0.93rem;
  line-height: 1.5;
}
.hits strong { display: block; font-size: 1.02rem; }

/* ---- Timeline ---- */
.timeline { list-style: none; padding: 0; margin: 0.75rem 0 0; border-left: 2px solid var(--rule); }
.timeline li { padding: 0 0 1.1rem 1.25rem; position: relative; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 0.5em;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.timeline .years { font-size: 0.85rem; color: var(--muted); display: block; }
.timeline .track { font-size: 0.75rem; color: var(--muted); border: 1px solid var(--rule); border-radius: 4px; padding: 0 0.35rem; margin-left: 0.4rem; vertical-align: middle; }

/* ---- Case study list ---- */
.cs-list { list-style: none; padding: 0; margin: 0.75rem 0 0; }
.cs-list li { border-top: 1px solid var(--rule); padding: 0.85rem 0; }
.cs-list li:last-child { border-bottom: 1px solid var(--rule); }
.cs-list .outcome { display: block; font-size: 0.9rem; color: var(--muted); }

/* ---- Case study pages ---- */
.facts {
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: var(--card);
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
}
.facts dt { font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); margin-top: 0.6rem; }
.facts dt:first-child { margin-top: 0; }
.facts dd { margin: 0.1rem 0 0; }

.caveat { font-size: 0.88rem; color: var(--muted); border-left: 3px solid var(--rule); padding-left: 0.9rem; margin: 1rem 0; }

/* ---- Footer ---- */
footer { margin-top: 4rem; padding-top: 1.25rem; border-top: 1px solid var(--rule); font-size: 0.85rem; color: var(--muted); }

@media (max-width: 560px) {
  body { font-size: 16px; padding-top: 1.5rem; }
  .hits { grid-template-columns: 1fr; }
}