:root {
  color-scheme: light dark;
  --bg: #f4f5f7;
  --card-bg: #fff;
  --text: #1a1a1a;
  --muted: #6b7280;
  --border: #d9dce1;
  --primary: #1f6feb;
  --danger: #b42318;
  --ok: #1a7f37;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "PingFang HK", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  padding-bottom: 3rem;
}

h1 { font-size: 1.25rem; margin: 0 0 0.5rem; }
h2 { font-size: 1.05rem; margin: 0 0 0.5rem; }

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.screen { max-width: 960px; margin: 0 auto; padding: 1rem; }

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  margin: 0 1rem 1rem;
}
.card.narrow { max-width: 420px; margin: 2.5rem auto; }

label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.65rem;
}
label.grow { flex: 1 1 auto; min-width: 0; }

input, select {
  display: block;
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.6rem 0.65rem;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  color: var(--text);
}

button {
  font-size: 0.95rem;
  padding: 0.65rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #eef1f5;
  color: var(--text);
  cursor: pointer;
}
button.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
button.danger { background: var(--danger); color: #fff; border-color: var(--danger); }
button.ghost { background: transparent; }
button.small { padding: 0.4rem 0.7rem; font-size: 0.85rem; }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.row { display: flex; gap: 0.6rem; align-items: flex-end; margin-bottom: 0.75rem; }
.row.wrap { flex-wrap: wrap; }

.hint { font-size: 0.82rem; color: var(--muted); }
.error { color: var(--danger); font-size: 0.85rem; min-height: 1.2em; }
.status { font-size: 0.85rem; }
.warn { color: var(--danger); font-size: 0.8rem; }

.banner {
  margin: 0 1rem 1rem;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  font-size: 0.9rem;
}
.banner.ok { background: #e6f4ea; color: var(--ok); border: 1px solid #b7e1c3; }
.banner.bad { background: #fbe7e6; color: var(--danger); border: 1px solid #f3c6c3; }
.banner.warn { background: #fff4e5; color: #8a5300; border: 1px solid #ffdca8; }

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0 1rem 0.75rem;
}
.tab-btn {
  flex: 0 0 auto;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.45rem 0.95rem;
  font-size: 0.85rem;
  white-space: nowrap;
  color: var(--muted);
}
.tab-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); font-weight: 600; }

.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.45);
  display: flex; align-items: center; justify-content: center;
  padding: 1rem;
  z-index: 100;
}
.modal-overlay[hidden] { display: none; }
.modal-card {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 1.1rem;
  max-width: 400px;
  width: 100%;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}
.modal-card h3 { margin: 0 0 0.6rem; font-size: 1.05rem; }
.modal-card p { margin: 0 0 1rem; font-size: 0.9rem; white-space: pre-line; }
.modal-actions { display: flex; gap: 0.6rem; justify-content: flex-end; }
.modal-actions button { min-width: 88px; }

.list { display: flex; flex-direction: column; gap: 0.5rem; margin-bottom: 0.75rem; }
.list-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.65rem 0.8rem;
  cursor: pointer;
  font-size: 0.9rem;
}
.list-item.selected { border-color: var(--primary); background: #eef4ff; }
.list-item .meta { color: var(--muted); font-size: 0.8rem; }
.empty { color: var(--muted); font-size: 0.85rem; padding: 0.5rem 0; }

.sign-form { border-top: 1px dashed var(--border); padding-top: 0.75rem; margin-top: 0.5rem; }

pre#log {
  background: #0f1117;
  color: #d7dae0;
  font-size: 0.78rem;
  padding: 0.75rem;
  border-radius: 8px;
  max-height: 220px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

@media (max-width: 560px) {
  header { padding: 0.6rem 0.75rem; }
  .screen { padding: 0.5rem; }
  .card { margin: 0 0.5rem 0.75rem; padding: 0.85rem; }
  .banner { margin: 0 0.5rem 0.75rem; }
  .row { flex-direction: column; align-items: stretch; }
  button { width: 100%; }
  .row button { width: auto; }
  .modal-actions button { width: auto; }
}