:root {
  --bg: #f6f3ee; --card: #ffffff; --ink: #2b2620; --ink2: #6b6459;
  --line: #e6e0d6; --accent: #e8663c; --ok: #2fa46a; --warn: #e0a52e; --bad: #d64541;
}
* { box-sizing: border-box; margin: 0; }
body {
  background: var(--bg); color: var(--ink);
  font: 15px/1.6 -apple-system, "PingFang SC", "Noto Sans CJK SC", sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar { background: var(--card); border-bottom: 1px solid var(--line); }
.topbar-inner {
  max-width: 1060px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
}
.brand { font-weight: 700; }
.topbar nav { display: flex; gap: 4px; }
.topbar nav a { padding: 4px 12px; border-radius: 8px; color: var(--ink2); }
.topbar nav a.on { background: var(--accent); color: #fff; }
.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.snapshot-at { color: var(--ink2); font-size: 13px; }
button.link { border: 0; background: none; color: var(--ink2); cursor: pointer; font-size: 14px; }

main { max-width: 1060px; margin: 18px auto 60px; padding: 0 16px; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px;
  padding: 16px 18px; margin-bottom: 16px;
}
.card h2 { font-size: 16px; margin-bottom: 10px; }

.kpi-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 12px; margin-bottom: 16px; }
.kpi { text-align: center; margin-bottom: 0; }
.kpi-num { font-size: 30px; font-weight: 800; }
.kpi-label { color: var(--ink2); font-size: 13px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 760px) { .grid-2 { grid-template-columns: 1fr; } }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; color: var(--ink2); font-weight: 500; }
th, td { padding: 6px 8px; border-bottom: 1px solid var(--line); }
tr:last-child td { border-bottom: 0; }

.ok { color: var(--ok); } .warn { color: var(--warn); } .bad { color: var(--bad); }
.empty, .hint { color: var(--ink2); font-size: 13px; margin-top: 8px; }

.legend { display: flex; gap: 14px; font-size: 13px; color: var(--ink2); margin-bottom: 6px; flex-wrap: wrap; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 5px; }
.trend svg { width: 100%; height: auto; }
.trend .grid { stroke: var(--line); stroke-width: 1; }
.trend .axis { fill: var(--ink2); font-size: 11px; }

.suspended { border-left: 4px solid var(--warn); }

.stage-row { border-bottom: 1px solid var(--line); padding: 8px 0; }
.stage-row:last-child { border-bottom: 0; }
.stage-head { display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; font-size: 14px; }
.stage-score { font-size: 22px; font-weight: 800; }
.advice { margin: 6px 0 0 18px; font-size: 14px; }
details summary { cursor: pointer; color: var(--accent); font-size: 13px; margin-top: 4px; }

.activity { list-style: none; }
.activity li { padding: 5px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.activity li:last-child { border-bottom: 0; }
.act-icon { display: inline-block; width: 24px; }
.act-date { color: var(--ink2); font-size: 12px; float: right; }

.filters { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.filters select, .filters input {
  padding: 6px 10px; border: 1px solid var(--line); border-radius: 8px;
  background: #fff; font-size: 14px;
}
.filters input[type=search] { flex: 1; min-width: 160px; }

.btn {
  display: inline-block; padding: 6px 14px; border-radius: 8px;
  border: 1px solid var(--line); background: #fff; color: var(--ink);
  font-size: 14px; cursor: pointer;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn:hover { text-decoration: none; filter: brightness(0.97); }

.chip {
  display: inline-block; padding: 1px 9px; border-radius: 999px;
  background: var(--bg); border: 1px solid var(--line);
  font-size: 12px; color: var(--ink2); margin-right: 5px;
}
.q-head { margin-bottom: 8px; }
.stem { font-size: 20px; margin: 8px 0; }
.photo { max-width: 100%; border-radius: 10px; border: 1px solid var(--line); }

.login-body {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: var(--bg);
}
.login-card {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 36px 32px; width: 320px; text-align: center;
  display: flex; flex-direction: column; gap: 14px;
}
.login-logo { font-size: 44px; }
.login-card h1 { font-size: 18px; }
.login-card input {
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; font-size: 16px;
}
.login-error { color: var(--bad); font-size: 14px; }

.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.btn.danger { border-color: var(--bad); color: var(--bad); }
.btn:disabled { opacity: 0.45; cursor: default; }

.settings-form { display: flex; flex-direction: column; gap: 10px; }
.settings-form label { display: flex; flex-direction: column; gap: 4px; font-size: 14px; color: var(--ink2); }
.settings-form input, .settings-form textarea {
  padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px;
  font-size: 14px; font-family: inherit; color: var(--ink);
}
.settings-form button { align-self: flex-start; }
.form-row { display: flex; gap: 12px; flex-wrap: wrap; }
.form-row label { flex: 1; min-width: 140px; }
.card.low-confidence { border-left: 4px solid var(--warn); background: #fffbf2; }
.mismatch { outline: 2px solid var(--warn); outline-offset: -2px; border-radius: 10px; }
.hw-thumb { height: 80px; border-radius: 8px; border: 1px solid var(--line); background: #fff; }
.tree-lesson { margin-left: 18px; }
.tree-item { margin-left: 36px; display: flex; gap: 8px; align-items: center; padding: 2px 0; }
.tree-item input { flex: 1; }
.paper-gen { border-top: 1px solid var(--line); padding: 12px 0; }
.paper-gen:first-of-type { border-top: 0; }
.paper-gen-head { display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.paper-kinds { margin: 8px 0; display: flex; gap: 6px; flex-wrap: wrap; }
.paper-gen-foot { display: flex; gap: 10px; align-items: center; font-size: 14px; }