:root {
  --ink: #1f2933; --muted: #6b7785; --line: #e3e7ec; --bg: #f7f8fa;
  --accent: #2f6f5e; --accent-soft: #e5f1ed; --warn: #a15c07; --warn-soft: #fdf3e3; --lock: #b7bec7;
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.6 -apple-system, "PingFang SC", "Helvetica Neue", sans-serif; color: var(--ink); background: var(--bg); }
.top { display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px; padding: 14px 20px; background: #fff; border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; font-size: 18px; color: var(--ink); text-decoration: none; }
.banner { flex-basis: 100%; margin: 0; font-size: 15px; font-weight: 600; }
.voice-status { flex-basis: 100%; margin: 0; font-size: 13px; color: var(--warn); }
.acct { margin-left: auto; }
main { max-width: 920px; margin: 0 auto; padding: 20px; }
.foot { max-width: 920px; margin: 0 auto; padding: 12px 20px 40px; color: var(--muted); font-size: 12px; }
.foot span::after { content: "｜"; margin: 0 4px; color: var(--line); }
.foot span:last-child::after { content: ""; }
h2 { font-size: 20px; margin: 8px 0 12px; }
h3 { font-size: 16px; margin: 18px 0 8px; }
.muted { color: var(--muted); }
.card { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 16px; margin-bottom: 14px; }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.btn { border: 1px solid var(--accent); background: var(--accent); color: #fff; border-radius: 8px; padding: 7px 14px; font-size: 14px; cursor: pointer; text-decoration: none; display: inline-block; }
.btn.ghost { background: #fff; color: var(--accent); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.stages { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.stage { border: 1px solid var(--line); border-radius: 10px; padding: 14px; background: #fff; }
.stage.locked { background: #eceff3; color: #8b949e; }
.stage.locked h3, .stage.locked b { color: #8b949e; font-weight: 500; }
.stage ul { padding-left: 18px; margin: 6px 0; font-size: 13px; }
.badge { font-size: 12px; padding: 1px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); }
.badge.lock { background: #eef0f3; color: var(--muted); }
.badge.warn { background: var(--warn-soft); color: var(--warn); }
.packs { display: flex; flex-wrap: wrap; gap: 8px; }
.slot { border: 1px dashed var(--lock); color: var(--muted); border-radius: 8px; padding: 4px 10px; font-size: 13px; }
.slot.on { border-style: solid; border-color: var(--accent); color: var(--accent); }
label { display: block; margin: 8px 0 4px; font-size: 14px; }
input[type=text], textarea, select { width: 100%; padding: 8px; border: 1px solid var(--line); border-radius: 8px; font: inherit; }
textarea { min-height: 70px; }
.item { border-top: 1px solid var(--line); padding: 10px 0; }
.item:first-of-type { border-top: 0; }
.prompt { font-family: Georgia, serif; font-size: 16px; }
.scores button { width: 34px; margin-right: 4px; }
.scores button.on { background: var(--accent); color: #fff; }
.scores button { border: 1px solid var(--accent); background: #fff; color: var(--accent); border-radius: 6px; padding: 3px 0; cursor: pointer; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
td, th { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
tr.skip td { color: var(--lock); text-decoration: line-through; }
tr.moved_up td:first-child, tr.extra td:first-child { color: var(--accent); font-weight: 600; }
.steps { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.steps span { cursor: pointer; font-size: 13px; padding: 3px 10px; border-radius: 999px; background: #eef0f3; color: var(--muted); }
.steps span.on { background: var(--accent); color: #fff; }
.steps span.done { background: var(--accent-soft); color: var(--accent); }
.chat { background: var(--bg); border-radius: 8px; padding: 10px; max-height: 340px; overflow: auto; }
.chat p { margin: 4px 0; }
.chat .ai { color: var(--accent); }
.chat .learner { text-align: right; }
.hidden-text { filter: blur(5px); user-select: none; }
.error { color: #b42318; }
.note { background: var(--warn-soft); color: var(--warn); border-radius: 8px; padding: 8px 12px; font-size: 13px; }
.badge, .btn { white-space: nowrap; }

.acct { font-size: 13px; color: var(--muted); }
.mic { min-width: 120px; }
@media (max-width: 640px) {
  main { padding: 12px; }
  .top { padding: 10px 12px; gap: 6px; }
  .banner, .voice-status { display: block; }
  .acct { margin-left: 0; }
  .stages { grid-template-columns: 1fr; }
  .btn { padding: 10px 14px; font-size: 15px; }
  td, th { padding: 4px; font-size: 13px; }
  .steps span { font-size: 12px; }
}