:root {
  --bg: #f5f6fa;
  --surface: #ffffff;
  --surface-2: #f0f2f8;
  --border: #e4e7f0;
  --text: #1f2430;
  --text-soft: #6b7280;
  --primary: #5b5bf0;
  --primary-soft: #ececfe;
  --accent: #14b8a6;
  --warn: #f59e0b;
  --danger: #ef4444;
  --ok: #22c55e;
  --radius: 14px;
  --shadow: 0 6px 24px rgba(31, 36, 48, 0.08);
  --sidebar-w: 230px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
}
#app { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar {
  width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 18px 14px;
  position: sticky;
  top: 0;
  height: 100vh;
}
.brand { display: flex; align-items: center; gap: 10px; padding: 6px 8px 16px; }
.brand-logo { font-size: 26px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text strong { font-size: 15px; }
.brand-text span { font-size: 11px; color: var(--text-soft); letter-spacing: 2px; }
.nav { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  border: none; background: transparent; color: var(--text);
  padding: 10px 12px; border-radius: 10px; cursor: pointer; text-align: left;
  font-size: 14px; transition: background .15s, color .15s;
}
.nav-item:hover { background: var(--surface-2); }
.nav-item.active { background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.nav-item span { font-size: 16px; }
.sidebar-foot { padding-top: 12px; border-top: 1px solid var(--border); }
.ai-mode {
  font-size: 12px; text-align: center; padding: 6px; border-radius: 8px;
  background: var(--surface-2); color: var(--text-soft);
}
.ai-mode.llm { background: #e7f7f3; color: var(--accent); }
.cloud-mode {
  margin-top: 8px; font-size: 12px; text-align: center; padding: 6px; border-radius: 8px;
  background: var(--surface-2); color: var(--text-soft);
}
.cloud-mode.local { background: #f1f3f5; color: #868e96; }
.cloud-mode.synced { background: #e7f0ff; color: #2f6bff; }

/* Main */
.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 26px; border-bottom: 1px solid var(--border); background: var(--surface);
}
.topbar h1 { font-size: 19px; margin: 0; }
.view { padding: 24px 26px; overflow-y: auto; }

/* Buttons */
.btn {
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  padding: 8px 14px; border-radius: 10px; cursor: pointer; font-size: 13px;
  transition: all .15s;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: #4a4ad6; color: #fff; }
.icon-btn { border: none; background: transparent; font-size: 16px; cursor: pointer; color: var(--text-soft); }

/* Cards / grid */
.grid { display: grid; gap: 16px; }
.cards-2 { grid-template-columns: repeat(2, 1fr); }
.cards-3 { grid-template-columns: repeat(3, 1fr); }
.cards-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px){ .cards-2,.cards-3,.cards-4{grid-template-columns:1fr;} }

.stat-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; box-shadow: var(--shadow);
}
.stat-card .num { font-size: 28px; font-weight: 700; }
.stat-card .label { color: var(--text-soft); font-size: 13px; }

.panel {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow); margin-bottom: 18px;
}
.panel h2 { margin: 0 0 14px; font-size: 16px; }
.panel h3 { margin: 0 0 10px; font-size: 14px; color: var(--text-soft); }

/* Item card */
.item-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px; box-shadow: var(--shadow); transition: transform .12s, box-shadow .12s;
  cursor: pointer; position: relative;
}
.item-card:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(31,36,48,.12); }
.item-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.type-badge { font-size: 11px; padding: 2px 8px; border-radius: 999px; background: var(--primary-soft); color: var(--primary); }
.cat-badge { font-size: 11px; padding: 2px 8px; border-radius: 999px; background: var(--surface-2); color: var(--text-soft); }
.item-title { font-weight: 600; margin: 0 0 6px; }
.item-summary { color: var(--text-soft); font-size: 13px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.tag { font-size: 11px; background: var(--surface-2); color: var(--text-soft); padding: 2px 8px; border-radius: 6px; }
.meta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 10px; font-size: 12px; color: var(--text-soft); }
.related { margin-top: 10px; border-top: 1px dashed var(--border); padding-top: 8px; font-size: 12px; color: var(--text-soft); }
.related a { color: var(--primary); cursor: pointer; }

/* Inputs */
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; color: var(--text-soft); margin-bottom: 6px; }
input[type=text], textarea, select {
  width: 100%; border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px;
  font-size: 14px; font-family: inherit; background: var(--surface); color: var(--text);
}
input:focus, textarea:focus { outline: none; border-color: var(--primary); }
textarea { resize: vertical; }

.seg { display: inline-flex; gap: 6px; flex-wrap: wrap; }
.seg-btn { border: 1px solid var(--border); background: var(--surface); border-radius: 10px; padding: 8px 12px; cursor: pointer; font-size: 13px; }
.seg-btn.active { background: var(--primary-soft); color: var(--primary); border-color: var(--primary); }

/* Modal */
.modal { position: fixed; inset: 0; background: rgba(20,24,35,.45); display: flex; align-items: center; justify-content: center; z-index: 50; }
.modal.hidden { display: none; }
.modal-card { background: var(--surface); width: min(640px, 92vw); max-height: 90vh; overflow: auto; border-radius: 16px; box-shadow: var(--shadow); }
.modal-head { display: flex; justify-content: space-between; align-items: center; padding: 18px 20px; border-bottom: 1px solid var(--border); }
.modal-body { padding: 18px 20px; }
.modal-foot { display: flex; justify-content: flex-end; gap: 10px; padding: 16px 20px; border-top: 1px solid var(--border); }
.analysis-preview { background: var(--surface-2); border-radius: 10px; padding: 12px; font-size: 13px; color: var(--text-soft); margin-top: 6px; }
.analysis-preview.hidden { display: none; }
.analysis-preview b { color: var(--text); }

/* toast */
.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); background: #1f2430; color: #fff; padding: 10px 18px; border-radius: 10px; z-index: 100; font-size: 13px; box-shadow: var(--shadow); }
.toast.hidden { display: none; }

/* misc */
.muted { color: var(--text-soft); }
.empty { text-align: center; color: var(--text-soft); padding: 40px 0; }
.row { display: flex; gap: 12px; align-items: center; }
.row.wrap { flex-wrap: wrap; }
.spread { justify-content: space-between; }
.search-box { display: flex; gap: 10px; }
.search-box input { flex: 1; }
.todo-item { display: flex; align-items: flex-start; gap: 10px; padding: 12px; border: 1px solid var(--border); border-radius: 10px; margin-bottom: 8px; background: var(--surface); }
.todo-item.done { opacity: .6; }
.todo-check { margin-top: 3px; }
.pill { font-size: 11px; padding: 2px 8px; border-radius: 999px; }
.pill.high { background: #fde8e8; color: var(--danger); }
.pill.normal { background: var(--surface-2); color: var(--text-soft); }
.pill.low { background: #e8f3fd; color: #2563eb; }
.pill.done { background: #e7f7ef; color: var(--ok); }
.list-item { padding: 12px; border-bottom: 1px solid var(--border); cursor: pointer; }
.list-item:hover { background: var(--surface-2); }
.kv { display: flex; gap: 8px; flex-wrap: wrap; margin: 4px 0; }
.chip { font-size: 12px; background: var(--surface-2); border-radius: 8px; padding: 4px 10px; color: var(--text); }
.chip.url { background: #e7f0fd; color: #2563eb; }
.chip.date { background: #fdf3e3; color: #b45309; }
.chip.todo { background: #e7f7ef; color: var(--ok); }
.chip.metric { background: #f3e8fd; color: #7c3aed; }
.summary-block { white-space: pre-wrap; background: var(--surface-2); border-radius: 10px; padding: 14px; font-size: 13.5px; }
.action-item { display: flex; gap: 8px; padding: 8px 0; border-bottom: 1px dashed var(--border); }
.action-item .dot { color: var(--accent); }
.toolbar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.filter-btn { border: 1px solid var(--border); background: var(--surface); border-radius: 999px; padding: 6px 14px; cursor: pointer; font-size: 13px; }
.filter-btn.active { background: var(--primary-soft); color: var(--primary); border-color: var(--primary); }
.qa-msg { padding: 12px 14px; border-radius: 12px; margin-bottom: 12px; max-width: 90%; }
.qa-user { background: var(--primary-soft); color: var(--primary); margin-left: auto; }
.qa-bot { background: var(--surface-2); }
.qa-src { font-size: 11px; color: var(--text-soft); margin-top: 6px; }
.hidden { display: none !important; }