* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #22242a;
  --muted: #8a8f99;
  --line: #e6e8ec;
  --accent: #2f6bff;
  --accent-soft: #e8efff;
  --ok: #16a34a;
  --ok-soft: #e5f6ec;
  --bad: #dc2626;
  --bad-soft: #fdeaea;
  --warn: #d97706;
}
html, body { height: 100%; }
body {
  font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  display: flex;
  flex-direction: column;
}

/* ---------- header ---------- */
header {
  display: flex; align-items: center; gap: 16px;
  padding: 10px 18px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; font-size: 17px; }
nav { display: flex; gap: 6px; }
.tab {
  border: none; background: transparent; padding: 6px 14px;
  border-radius: 8px; cursor: pointer; font-size: 14px; color: var(--muted);
}
.tab.active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.day-switch { display: flex; align-items: center; gap: 6px; margin-left: auto; }
.day-switch button {
  border: 1px solid var(--line); background: var(--card); border-radius: 6px;
  width: 28px; height: 28px; cursor: pointer; font-size: 15px;
}
#dayLabel { font-weight: 700; min-width: 34px; text-align: center; }
.ai-badge {
  font-size: 12px; padding: 4px 10px; border-radius: 999px;
  background: #fff7e6; color: var(--warn); border: 1px solid #ffe3b0;
}
.ai-badge.on { background: var(--ok-soft); color: var(--ok); border-color: #bfe8cd; }

/* ---------- main / views ---------- */
main { flex: 1; overflow: hidden; }
.view { display: none; height: 100%; }
.view.active { display: flex; }

/* ---------- daily view ---------- */
#view-daily.active { display: grid; grid-template-columns: 210px 1fr 330px; }

#qlist {
  overflow-y: auto; padding: 12px 8px; border-right: 1px solid var(--line);
  background: var(--card);
}
.qitem {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 10px; border-radius: 8px; cursor: pointer;
  font-size: 13px; color: var(--muted); margin-bottom: 2px;
}
.qitem:hover { background: var(--bg); }
.qitem.current { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.qitem .dot {
  width: 9px; height: 9px; border-radius: 50%; background: #cfd3da; flex: none;
}
.qitem.answered .dot { background: var(--accent); }
.qitem.right .dot { background: var(--ok); }
.qitem.wrong .dot { background: var(--bad); }
.qitem .tag { font-size: 11px; color: var(--muted); margin-left: auto; }

#qarea { overflow-y: auto; padding: 22px 30px; }
.q-meta { font-size: 12px; color: var(--muted); margin-bottom: 10px; display: flex; gap: 10px; flex-wrap: wrap; }
.q-meta .chip { background: var(--bg); border-radius: 999px; padding: 2px 10px; }
.q-stem { font-size: 16px; line-height: 1.8; margin-bottom: 18px; white-space: pre-wrap; }
.opts { display: flex; flex-direction: column; gap: 10px; }
.opt {
  border: 1px solid var(--line); background: var(--card);
  border-radius: 10px; padding: 12px 14px; cursor: pointer;
  display: flex; gap: 10px; line-height: 1.6; font-size: 15px;
}
.opt:hover { border-color: var(--accent); }
.opt .letter { font-weight: 700; color: var(--accent); flex: none; }
.opt.sel { border-color: var(--accent); background: var(--accent-soft); }
.opt.right { border-color: var(--ok); background: var(--ok-soft); }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.opt.disabled { cursor: default; }
.feedback { margin-top: 16px; padding: 12px 14px; border-radius: 10px; font-size: 14px; line-height: 1.7; display: none; }
.feedback.show { display: block; }
.feedback.right { background: var(--ok-soft); color: var(--ok); }
.feedback.wrong { background: var(--bad-soft); color: var(--bad); }
.analysis { margin-top: 12px; padding: 12px 14px; border-radius: 10px; background: var(--bg); font-size: 14px; line-height: 1.8; white-space: pre-wrap; display: none; }
.analysis.show { display: block; }
.q-nav { margin-top: 20px; display: flex; gap: 10px; }
.q-nav button, .btn {
  border: none; background: var(--accent); color: #fff;
  padding: 8px 18px; border-radius: 8px; cursor: pointer; font-size: 14px;
}
.q-nav button.ghost, .btn.ghost { background: var(--bg); color: var(--ink); border: 1px solid var(--line); }
.src-img { margin-top: 14px; }
.src-img img { max-width: 100%; border: 1px solid var(--line); border-radius: 10px; }
.src-img summary { cursor: pointer; color: var(--muted); font-size: 13px; margin-bottom: 6px; }

/* ---------- AI panel ---------- */
#aipanel {
  border-left: 1px solid var(--line); background: var(--card);
  display: flex; flex-direction: column; padding: 14px;
}
.ai-head { font-weight: 700; margin-bottom: 4px; }
.ai-status { font-size: 12px; color: var(--muted); margin-bottom: 8px; }
.ai-chat { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 8px; margin-bottom: 10px; }
.bubble { max-width: 95%; padding: 8px 12px; border-radius: 10px; font-size: 13px; line-height: 1.6; white-space: pre-wrap; }
.bubble.user { background: var(--accent-soft); align-self: flex-end; }
.bubble.assistant { background: var(--bg); align-self: flex-start; }
.bubble.loading { color: var(--muted); }
.ai-actions { display: flex; gap: 8px; margin-bottom: 8px; }
.ai-actions button { flex: 1; }
.ai-input-row { display: flex; gap: 6px; }
.ai-input-row input {
  flex: 1; border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; font-size: 13px;
}
.ai-input-row button { padding: 8px 14px; }

/* ---------- wrong view ---------- */
#view-wrong.active { display: flex; flex-direction: column; }
.wrong-toolbar { padding: 14px 18px; display: flex; align-items: center; gap: 14px; border-bottom: 1px solid var(--line); background: var(--card); }
.muted { color: var(--muted); font-size: 13px; }
#wrongList { flex: 1; overflow-y: auto; padding: 16px 18px; display: flex; flex-direction: column; gap: 12px; }
.wrong-card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; }
.wrong-card .q-meta { margin-bottom: 8px; }
.wrong-card .w-stem { font-size: 14px; line-height: 1.7; white-space: pre-wrap; }
.wrong-card .w-row { font-size: 13px; margin-top: 8px; color: var(--muted); }
.wrong-card .w-row b { color: var(--ink); }
.report-box {
  flex: 1; overflow-y: auto; padding: 18px; background: var(--bg);
  font-size: 14px; line-height: 1.9; white-space: pre-wrap;
}

/* ---------- footer ---------- */
footer.stats {
  padding: 8px 18px; border-top: 1px solid var(--line); background: var(--card);
  font-size: 13px; color: var(--muted); display: flex; gap: 22px;
}