:root {
  color-scheme: light;
  --ink: #1c1915;
  --muted: #5c564c;
  --paper: #f6f3ec;
  --card: #fffdf8;
  --line: #e4dccb;
  --pine: #1f6b4a;
  --pine-dark: #154c34;
  --danger: #8d2f2f;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.45;
}

a { color: var(--pine-dark); }

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem 1.4rem;
  background: #243126;
  color: #f4efe4;
}

.top a { color: inherit; text-decoration: none; }

.brand { font-weight: 700; letter-spacing: 0.01em; }

.top nav { display: flex; gap: 1rem; align-items: center; }

.top button, button, .button {
  background: var(--pine);
  color: white;
  border: 0;
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  text-decoration: none;
  cursor: pointer;
  font: inherit;
}

button.secondary, .top button { background: transparent; color: inherit; border: 1px solid currentColor; }

main { padding: 1.4rem; max-width: 980px; margin: 0 auto; }

.card, .thread article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1rem 1.1rem;
  margin: 0.8rem 0;
}

.narrow { max-width: 420px; margin: 2rem auto; }

label { display: block; margin: 0.7rem 0; font-size: 0.92rem; color: var(--muted); }

input, textarea, select {
  display: block;
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  font: inherit;
  color: var(--ink);
  background: white;
}

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.7rem; }

.stats article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.9rem;
}

.stats strong { display: block; font-size: 1.6rem; }

.stats span, .hint { color: var(--muted); }

table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: 12px; overflow: hidden; }

th, td { text-align: left; padding: 0.55rem 0.7rem; border-bottom: 1px solid var(--line); vertical-align: top; }

.row { display: flex; justify-content: space-between; align-items: center; gap: 1rem; }

.error { color: var(--danger); }

.token {
  display: block;
  padding: 0.7rem;
  background: #f3eee4;
  border-radius: 10px;
  word-break: break-all;
}

.thread .user { border-left: 4px solid var(--pine); }
.thread .assistant { border-left: 4px solid #c4a36a; }

.bubble header { font-size: 0.8rem; color: var(--muted); }

form.card button, .thread form button, .card form + form { margin-top: 0.6rem; }

@media (max-width: 720px) {
  .stats { grid-template-columns: 1fr 1fr; }
  .top { flex-direction: column; align-items: flex-start; }
}