:root {
  --bg: #f3efe6;
  --ink: #1c2430;
  --accent: #0f5c4c;
  --danger: #9b2c2c;
  --card: #fffdf8;
  --line: #d5cdc0;
  --muted: #5c6570;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "IBM Plex Sans JP", "Hiragino Sans", sans-serif;
  background:
    radial-gradient(circle at top left, #e7f1ec 0, transparent 40%),
    linear-gradient(180deg, #f7f3ea, var(--bg));
  color: var(--ink);
  min-height: 100vh;
}

.top {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.5rem 2rem 0.5rem;
}
.eyebrow { margin: 0; color: var(--accent); font-size: 0.85rem; letter-spacing: 0.04em; }
h1 { margin: 0.2rem 0 0; font-size: 1.6rem; }
.banner {
  margin: 0;
  background: #fff4e5;
  border: 1px solid #f0d7a8;
  padding: 0.6rem 0.9rem;
  border-radius: 8px;
  max-width: 18rem;
  font-size: 0.85rem;
}

.tabs { display: flex; gap: 0.5rem; padding: 0 2rem; }
.tab {
  border: 1px solid var(--line);
  background: transparent;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  cursor: pointer;
}
.tab.active { background: var(--accent); color: white; border-color: var(--accent); }

main { padding: 1rem 2rem 3rem; max-width: 960px; }
.panel { display: none; }
.panel.active { display: block; }

label { display: block; font-weight: 600; margin-bottom: 0.4rem; }
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.9rem;
  font: inherit;
  background: var(--card);
}
.row { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; margin: 0.8rem 0 1rem; }
.inline { font-weight: 400; display: flex; gap: 0.4rem; align-items: center; }
button {
  border: 0;
  border-radius: 8px;
  padding: 0.65rem 1rem;
  cursor: pointer;
  font: inherit;
}
.primary { background: var(--accent); color: white; }
.danger { background: var(--danger); color: white; }
.ghost { background: white; border: 1px solid var(--line); }

.answer, #trace, #events {
  background: #152028;
  color: #e8eef2;
  padding: 1rem;
  border-radius: 10px;
  white-space: pre-wrap;
  overflow: auto;
  min-height: 4rem;
}
.cards { display: grid; gap: 0.8rem; margin-bottom: 1.5rem; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
}
.card h3 { margin: 0 0 0.4rem; font-size: 1rem; }
.card p { margin: 0.2rem 0; color: var(--muted); font-size: 0.9rem; }
.card .actions { margin-top: 0.7rem; display: flex; gap: 0.5rem; }
.stats { margin-bottom: 1rem; color: var(--muted); }
.hint { color: var(--muted); font-size: 0.9rem; margin: 0 0 0.8rem; }
.upload {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1.5rem;
}
.upload-meta { align-items: flex-end; }
.field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-weight: 600;
  font-size: 0.85rem;
  min-width: 12rem;
  flex: 1;
}
.field input {
  font: inherit;
  font-weight: 400;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
}
.status {
  margin: 0 0 0.8rem;
  color: var(--accent);
  font-weight: 600;
}
button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}
footer {
  padding: 1rem 2rem 2rem;
  color: var(--muted);
  font-size: 0.85rem;
}