:root {
  --bg: #f3efe6;
  --ink: #1c1a16;
  --muted: #6b6458;
  --line: #d9d0c0;
  --accent: #0f6b5c;
  --card: #fffdf8;
  --error: #9b1c1c;
  --font: "Source Serif 4", "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  --sans: "IBM Plex Sans", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { font-size: 17px; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, #ffe8c8 0%, transparent 55%),
    linear-gradient(180deg, #f7f2e8 0%, var(--bg) 40%, #ebe4d6 100%);
  font-family: var(--sans);
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: .9rem 1.25rem;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--card) 80%, transparent);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
}
.brand {
  font-family: var(--font);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
}
.user {
  display: flex;
  align-items: center;
  gap: .75rem;
  color: var(--muted);
  font-size: .9rem;
}
.user button, .stack button, .auth-card button {
  border: 0;
  background: var(--accent);
  color: #fff;
  padding: .55rem .95rem;
  font: inherit;
  cursor: pointer;
}
.user button { background: transparent; color: var(--accent); border: 1px solid var(--line); padding: .35rem .7rem; }

.wrap { width: min(720px, calc(100% - 2rem)); margin: 1.5rem auto 3rem; }
h1 { font-family: var(--font); font-weight: 700; line-height: 1.2; margin: 0 0 .75rem; }
.lead, .crumb, .muted { color: var(--muted); }
.crumb { font-size: .9rem; margin-bottom: 1rem; }
.list { list-style: none; padding: 0; margin: 1.25rem 0 0; }
.list li {
  border-top: 1px solid var(--line);
  padding: .85rem 0;
}
.list a { color: var(--ink); font-size: 1.05rem; }
.material .body { line-height: 1.65; font-family: var(--font); font-size: 1.08rem; }
.material .body p { margin: 0 0 1rem; }

.auth {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 1rem;
}
.auth-card {
  width: min(380px, 100%);
  background: var(--card);
  border: 1px solid var(--line);
  padding: 1.5rem;
}
.eyebrow { margin: 0 0 .35rem; color: var(--muted); letter-spacing: .04em; text-transform: uppercase; font-size: .75rem; }
.stack { display: grid; gap: .9rem; margin-top: 1rem; }
.stack label { display: grid; gap: .35rem; font-size: .9rem; color: var(--muted); }
.stack input {
  font: inherit;
  padding: .65rem .7rem;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}
.error { color: var(--error); margin: .75rem 0 0; }

.top-left { display: flex; align-items: center; gap: 1.25rem; flex-wrap: wrap; }
.nav-inline { display: flex; gap: .9rem; font-size: .95rem; }
.nav-inline a { color: var(--muted); }
.nav { color: var(--muted); font-size: .9rem; margin-bottom: .75rem; }
.chips { list-style: none; display: flex; flex-wrap: wrap; gap: .5rem; padding: 0; margin: 0 0 1rem; }
.chips a {
  display: inline-block;
  padding: .35rem .7rem;
  border: 1px solid var(--line);
  color: var(--ink);
  background: var(--card);
  text-decoration: none;
}
.chips .on a { border-color: var(--accent); color: var(--accent); }

.chat-log {
  border: 1px solid var(--line);
  background: var(--card);
  min-height: 280px;
  max-height: min(55vh, 520px);
  overflow-y: auto;
  padding: .9rem 1rem;
  margin-bottom: .85rem;
}
.msg { padding: .55rem 0; border-top: 1px solid var(--line); }
.msg:first-child { border-top: 0; }
.msg-meta {
  display: flex;
  justify-content: space-between;
  gap: .75rem;
  font-size: .85rem;
  color: var(--muted);
  margin-bottom: .25rem;
}
.msg-body { white-space: pre-wrap; word-break: break-word; line-height: 1.45; }
.chat-form {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: .6rem;
  align-items: end;
}
.chat-form textarea {
  font: inherit;
  padding: .65rem .7rem;
  border: 1px solid var(--line);
  background: #fff;
  resize: vertical;
  min-height: 2.8rem;
}
.chat-form button {
  border: 0;
  background: var(--accent);
  color: #fff;
  padding: .7rem 1rem;
  font: inherit;
  cursor: pointer;
  height: 2.8rem;
}
@media (max-width: 560px) {
  .chat-form { grid-template-columns: 1fr; }
}