:root {
  --bg: #faf6ef;
  --panel: #ffffff;
  --ink: #2e2a24;
  --muted: #8a8175;
  --line: #e7ddcf;
  --primary: #8c5a3c;
  --primary-d: #6f4530;
  --ok: #3f7d52;
  --warn: #b5852a;
  --err: #b23b2e;
  --chip: #f0e7d8;
  --serif: Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

#app { max-width: 1080px; margin: 0 auto; padding: 0 18px 60px; }

/* ---------- topbar ---------- */
.topbar {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 16px 0 14px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 22px;
}
.brand {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--primary-d);
  letter-spacing: 2px;
}
.topbar nav a {
  text-decoration: none;
  color: var(--muted);
  font-size: 14px;
  padding: 4px 2px;
  border-bottom: 2px solid transparent;
}
.topbar nav a.active { color: var(--primary); border-bottom-color: var(--primary); }
.topbar .user { margin-left: auto; font-size: 14px; color: var(--muted); }

/* ---------- buttons ---------- */
button {
  font-family: var(--sans);
  cursor: pointer;
  border: 1px solid var(--primary);
  background: var(--primary);
  color: #fff;
  border-radius: 7px;
  padding: 8px 14px;
  font-size: 14px;
  transition: background .15s, opacity .15s;
}
button:hover { background: var(--primary-d); }
button:disabled { opacity: .55; cursor: default; }
button.danger { background: #fff; color: var(--err); border-color: var(--err); }
button.danger:hover { background: var(--err); color: #fff; }
button.mini { padding: 3px 9px; font-size: 12px; }
button.open, button.ghost { background: #fff; color: var(--primary); }
button.ghost:hover, button.open:hover { background: var(--chip); }

input, select, textarea {
  font-family: var(--sans);
  font-size: 14px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: #fff;
  color: var(--ink);
}
input:focus, select:focus { outline: none; border-color: var(--primary); }

/* ---------- layout ---------- */
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.row.between { justify-content: space-between; }
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
  margin-bottom: 18px;
  box-shadow: 0 1px 2px rgba(60,40,20,.04);
}
.two-col { display: grid; grid-template-columns: 1fr 1.4fr; gap: 18px; align-items: start; }
@media (max-width: 820px) { .two-col { grid-template-columns: 1fr; } }

h2 { font-family: var(--serif); margin: 0 0 6px; }
h3 { margin: 0 0 12px; font-size: 16px; }
h4 { margin: 16px 0 8px; font-size: 14px; color: var(--primary-d); }
.muted { color: var(--muted); font-size: 13px; }
.empty { color: var(--muted); font-style: italic; font-size: 13px; }
.error { color: var(--err); background: #fbeae7; border: 1px solid #f0c9c2; padding: 10px 12px; border-radius: 8px; }
.loading { color: var(--muted); padding: 24px 0; }
.back { display: inline-block; color: var(--primary); text-decoration: none; margin-bottom: 10px; font-size: 14px; }
a { color: var(--primary); }

/* ---------- login ---------- */
.login-wrap { display: flex; justify-content: center; padding-top: 12vh; }
.login-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
  padding: 36px 32px; width: 360px; text-align: center; box-shadow: 0 4px 18px rgba(60,40,20,.06);
}
.login-card h1 { font-family: var(--serif); color: var(--primary-d); letter-spacing: 4px; margin: 0; }
.login-card .sub { color: var(--muted); margin: 4px 0 22px; font-size: 14px; }
.login-card label { display: block; text-align: left; font-size: 13px; color: var(--muted); margin: 0 0 6px; }
.login-card input { width: 100%; margin-bottom: 16px; }
.login-card button { width: 100%; }
.login-card button + button { margin-top: 10px; }
.login-card button.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.login-card button.primary:hover { background: var(--primary-d); border-color: var(--primary-d); }
.login-card hr { border: none; border-top: 1px solid var(--line); margin: 22px 0 18px; }
.login-card .hint { font-size: 12px; color: var(--muted); margin-top: 16px; line-height: 1.5; }

/* ---------- project grid ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px,1fr)); gap: 14px; }
.project-card h4 { font-family: var(--serif); margin: 0 0 6px; font-size: 17px; }
.project-card .row.between { margin-top: 10px; }

/* ---------- tree ---------- */
.tree ul { list-style: none; margin: 6px 0 0; padding-left: 16px; border-left: 1px dashed var(--line); }
.tree > ul { padding-left: 0; border-left: none; }
.tree-node { display: flex; align-items: center; gap: 8px; padding: 5px 0; flex-wrap: wrap; }
.tree-node .t-title { font-weight: 600; }
.tree-node .badge { font-size: 11px; color: var(--muted); background: var(--chip); border-radius: 10px; padding: 1px 8px; }
.tree-acts { margin-left: auto; display: flex; gap: 6px; }

/* ---------- materials ---------- */
.mat-list { display: flex; flex-direction: column; gap: 8px; }
.mat-item { display: block; padding: 9px 11px; border: 1px solid var(--line); border-radius: 9px; background: #fff; cursor: pointer; }
.mat-item:hover { border-color: var(--primary); background: #fffdf9; }
.mat-main { display: flex; align-items: center; gap: 10px; }
.mat-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 6px; font-size: 12px; color: var(--muted); }
.mat-name { font-weight: 500; }
/* 删除按钮：靠右，悬浮时才显眼，避免误点 */
.mat-del { margin-left: auto; opacity: .55; }
.mat-item:hover .mat-del { opacity: 1; }
.mat-del:disabled { opacity: .5; cursor: default; }
.kind { font-size: 11px; padding: 1px 7px; border-radius: 9px; background: var(--chip); color: var(--primary-d); text-transform: capitalize; }
.chip { font-size: 11px; padding: 1px 8px; border-radius: 9px; background: var(--chip); color: var(--muted); }
.file-info { font-size: 12px; color: var(--muted); }
.upload-result { margin: 10px 0 4px; font-size: 13px; padding: 8px 12px; border-radius: 8px; display: none; }
.upload-result.ok { display: block; color: var(--ok); background: #e3f1e7; border: 1px solid #c4e2cd; }
.upload-result.err { display: block; color: var(--err); background: #fbeae7; border: 1px solid #f0c9c2; }
.resume-banner { display: none; margin: 0 0 12px; font-size: 13px; padding: 9px 12px; border-radius: 8px; color: var(--warn); background: #fbf0d8; border: 1px solid #ecd9ab; }
.progress { display: none; align-items: center; gap: 10px; margin: 10px 0 4px; }
.progress .track { flex: 1; height: 10px; background: var(--chip); border-radius: 6px; overflow: hidden; }
.progress .bar { height: 100%; width: 0%; background: var(--primary); border-radius: 6px; transition: width .15s ease; }
.progress-txt { font-size: 12px; color: var(--muted); min-width: 40px; text-align: right; }

.status { font-size: 11px; padding: 2px 8px; border-radius: 9px; font-weight: 600; }
.status-ok { background: #e3f1e7; color: var(--ok); }
.status-warn { background: #fbf0d8; color: var(--warn); }
.status-err { background: #fbeae7; color: var(--err); }

/* ---------- 浮层提示（删除等操作反馈） ---------- */
#toast-box { position: fixed; right: 20px; bottom: 24px; display: flex; flex-direction: column; align-items: flex-end; gap: 8px; z-index: 9999; }
.toast { max-width: 320px; padding: 9px 14px; border-radius: 9px; font-size: 13px; background: #fff; border: 1px solid var(--line); color: var(--ink); box-shadow: 0 8px 22px rgba(90, 60, 30, .16); opacity: 0; transform: translateY(8px); transition: opacity .22s ease, transform .22s ease; }
.toast.in { opacity: 1; transform: none; }
.toast.out { opacity: 0; transform: translateY(8px); }
.toast.ok { color: var(--ok); background: #f2f9f4; border-color: #c4e2cd; }
.toast.err { color: var(--err); background: #fdf3f1; border-color: #f0c9c2; }

/* ---------- material detail ---------- */
pre.text { white-space: pre-wrap; word-break: break-word; background: #fbf8f2; border: 1px solid var(--line); border-radius: 9px; padding: 14px; font-family: var(--serif); font-size: 15px; line-height: 1.8; max-height: 420px; overflow: auto; margin: 0; }
.tm-list, .ent-list, .timeline { margin: 0; padding-left: 18px; }
.tm-list li, .ent-list li { margin: 5px 0; }
.timeline { list-style: none; padding-left: 0; }
.timeline li { position: relative; padding: 6px 0 6px 16px; border-left: 2px solid var(--line); margin-left: 4px; }
.timeline li .date { font-weight: 700; color: var(--primary-d); margin-right: 6px; }
.timeline li::before { content: ""; position: absolute; left: -6px; top: 12px; width: 9px; height: 9px; border-radius: 50%; background: var(--primary); }