:root {
  --bg: #f3f5f4;
  --surface: #ffffff;
  --surface-alt: #eef1ef;
  --text: #172026;
  --muted: #66716d;
  --border: #d8dedb;
  --border-strong: #b9c2be;
  --charcoal: #1e292c;
  --red: #b73a3e;
  --teal: #23766e;
  --amber: #ad741a;
  --blue: #46699c;
  --violet: #755d8d;
  --positive: #ae3438;
  --negative: #27776e;
  --radius: 6px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 14px;
  letter-spacing: 0;
}

button, input { font: inherit; }
button { cursor: pointer; }

.app-shell { min-width: 320px; }

.topbar {
  min-height: 64px;
  padding: 10px 20px;
  background: var(--charcoal);
  color: #f7f9f8;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-block, .top-actions, .toolbar-controls, .score-line {
  display: flex;
  align-items: center;
}

.brand-block { gap: 11px; min-width: 0; }
.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  background: var(--red);
  border-radius: 4px;
  font-weight: 700;
  font-size: 13px;
}

h1, h2, p { margin: 0; }
h1 { font-size: 18px; font-weight: 650; }
h2 { font-size: 14px; font-weight: 650; }
.brand-block p { margin-top: 3px; color: #bfc9c5; font-size: 12px; }
.top-actions { gap: 8px; }

.icon-button, .upload-button, .secondary-button, .text-button, .segmented button {
  border: 1px solid transparent;
  border-radius: 4px;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
}

.icon-button {
  width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  background: #354246;
  color: #f7f9f8;
}
.icon-button:hover { background: #465559; }
.icon-button.light { background: var(--surface); color: var(--text); border-color: var(--border); }

.upload-button {
  min-height: 34px;
  padding: 0 12px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--red);
  color: white;
  font-weight: 600;
}
.upload-button:hover { background: #9f3034; }

main { padding: 14px; }

.kpi-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}

.kpi-item {
  min-width: 0;
  padding: 13px 15px;
  border-right: 1px solid var(--border);
}
.kpi-item:last-child { border-right: 0; }
.kpi-label, .kpi-context, .panel-heading span, .section-heading span, .signal-score > span, .model-window span {
  color: var(--muted);
  font-size: 12px;
}
.kpi-value-row { margin-top: 6px; display: flex; align-items: baseline; gap: 6px; min-width: 0; }
.kpi-value { font-size: 24px; font-weight: 680; white-space: nowrap; }
.kpi-unit { color: var(--muted); font-size: 12px; }
.kpi-context { margin-top: 4px; display: flex; justify-content: space-between; gap: 8px; }
.delta.up { color: var(--positive); }
.delta.down { color: var(--negative); }

.research-layout {
  margin-top: 14px;
  display: grid;
  grid-template-columns: 246px minmax(520px, 1fr) 252px;
  gap: 12px;
  align-items: stretch;
}

.metric-panel, .signal-panel, .chart-workspace, .mini-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.metric-panel, .signal-panel { padding: 13px; min-width: 0; }
.panel-heading, .section-heading, .workspace-toolbar, .axis-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.panel-heading > div { min-width: 0; }
.panel-heading span { display: block; margin-top: 3px; }

.text-button {
  padding: 4px 7px;
  background: transparent;
  color: var(--muted);
}
.text-button:hover { color: var(--text); background: var(--surface-alt); }

.group-tabs {
  margin-top: 12px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
}
.group-tabs button {
  min-width: 0;
  padding: 6px 3px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface);
  color: var(--muted);
  font-size: 12px;
}
.group-tabs button.active { background: var(--charcoal); border-color: var(--charcoal); color: white; }

.search-box {
  height: 34px;
  margin-top: 10px;
  padding: 0 9px;
  display: flex;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--border);
  border-radius: 4px;
}
.search-box:focus-within { border-color: var(--border-strong); box-shadow: 0 0 0 2px rgba(35,118,110,.12); }
.search-box input { min-width: 0; width: 100%; border: 0; outline: 0; background: transparent; color: var(--text); }
.search-box svg { width: 15px; color: var(--muted); }

.metric-list {
  margin-top: 8px;
  height: 472px;
  overflow-y: auto;
  scrollbar-width: thin;
}
.metric-row {
  width: 100%;
  padding: 8px 6px;
  border: 0;
  border-bottom: 1px solid #edf0ee;
  background: transparent;
  color: var(--text);
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 7px;
  text-align: left;
}
.metric-row:hover { background: var(--surface-alt); }
.metric-row.active { background: #f3e8e8; }
.metric-row > span:last-child { min-width: 0; }
.metric-check {
  width: 15px;
  height: 15px;
  margin-top: 2px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border-strong);
  border-radius: 3px;
  font-size: 11px;
}
.metric-row.active .metric-check { background: var(--red); border-color: var(--red); color: white; }
.metric-name { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 12px; }
.metric-meta { display: block; margin-top: 2px; color: var(--muted); font-size: 11px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.chart-workspace { min-width: 0; overflow: hidden; }
.workspace-toolbar { min-height: 54px; padding: 9px 12px; border-bottom: 1px solid var(--border); }
.selected-title { min-width: 0; }
.selected-title span { display: block; color: var(--muted); font-size: 12px; }
.selected-title strong { display: block; max-width: 360px; margin-top: 3px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 13px; }
.toolbar-controls { gap: 7px; flex-wrap: wrap; justify-content: flex-end; }
.segmented { display: inline-flex; border: 1px solid var(--border); border-radius: 4px; overflow: hidden; }
.segmented button { min-width: 40px; min-height: 32px; padding: 0 8px; border-radius: 0; border-right: 1px solid var(--border); background: var(--surface); color: var(--muted); font-size: 12px; }
.segmented button:last-child { border-right: 0; }
.segmented button.active { background: var(--charcoal); color: white; }

.chart-frame { padding: 5px 4px 0; }
#main-chart { width: 100%; height: 445px; }
.axis-controls { min-height: 48px; padding: 8px 12px; border-top: 1px solid var(--border); justify-content: flex-start; flex-wrap: wrap; }
.axis-controls label { display: flex; align-items: center; gap: 5px; color: var(--muted); font-size: 12px; }
.axis-controls input { width: 84px; height: 30px; border: 1px solid var(--border); border-radius: 4px; padding: 0 7px; color: var(--text); }
.secondary-button { min-height: 30px; padding: 0 10px; background: var(--surface-alt); border-color: var(--border); color: var(--text); }
.axis-hint { margin-left: auto; color: var(--muted); font-size: 11px; }

.signal-panel { display: flex; flex-direction: column; }
.signal-score-grid { margin-top: 12px; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.signal-score { padding: 10px; background: var(--surface-alt); border-radius: 4px; }
.signal-score strong { display: block; margin-top: 6px; font-size: 15px; }
.score-line { margin-top: 5px; align-items: baseline; gap: 3px; }
.score-line b { font-size: 26px; }
.score-line span { color: var(--muted); font-size: 11px; }
.signal-bars { margin-top: 15px; display: grid; gap: 12px; }
.signal-bar-head { display: flex; justify-content: space-between; gap: 8px; font-size: 12px; }
.signal-bar-head span:last-child { color: var(--muted); }
.signal-track { position: relative; height: 7px; margin-top: 6px; background: #e7ebe9; border-radius: 2px; overflow: hidden; }
.signal-fill { position: absolute; left: 50%; top: 0; height: 100%; background: var(--red); }
.signal-fill.negative { right: 50%; left: auto; background: var(--teal); }
.model-window { margin-top: auto; padding-top: 15px; border-top: 1px solid var(--border); display: grid; gap: 10px; }
.model-window span, .model-window strong { display: block; }
.model-window strong { margin-top: 3px; font-size: 12px; line-height: 1.45; }

.lower-grid { margin-top: 12px; display: grid; grid-template-columns: 1.35fr 1fr; gap: 12px; }
.mini-section { min-width: 0; overflow: hidden; }
.section-heading { min-height: 48px; padding: 10px 13px; border-bottom: 1px solid var(--border); }
.section-heading > div { min-width: 0; }
.mini-chart { width: 100%; height: 280px; }
.observation-table-wrap { height: 280px; overflow: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px 12px; border-bottom: 1px solid #edf0ee; text-align: right; white-space: nowrap; font-size: 12px; }
th { position: sticky; top: 0; z-index: 1; background: var(--surface-alt); color: var(--muted); font-weight: 600; }
th:first-child, td:first-child { text-align: left; max-width: 260px; overflow: hidden; text-overflow: ellipsis; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 18px;
  z-index: 20;
  transform: translateX(-50%) translateY(20px);
  padding: 9px 13px;
  background: var(--charcoal);
  color: white;
  border-radius: 4px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s ease, transform .18s ease;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.empty-state { padding: 18px 8px; color: var(--muted); text-align: center; font-size: 12px; }

svg { width: 16px; height: 16px; stroke-width: 1.8; }

@media (max-width: 1180px) {
  .research-layout { grid-template-columns: 220px minmax(500px, 1fr); }
  .signal-panel { grid-column: 1 / -1; display: grid; grid-template-columns: 220px 1fr 280px; gap: 14px; align-items: start; }
  .signal-panel .panel-heading { align-self: center; }
  .signal-score-grid, .signal-bars { margin-top: 0; }
  .model-window { margin-top: 0; padding-top: 0; padding-left: 14px; border-top: 0; border-left: 1px solid var(--border); }
}

@media (max-width: 860px) {
  main { padding: 10px; }
  .kpi-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .kpi-item:nth-child(2) { border-right: 0; }
  .kpi-item:nth-child(-n+2) { border-bottom: 1px solid var(--border); }
  .research-layout { grid-template-columns: 1fr; }
  .metric-panel { order: 2; }
  .chart-workspace { order: 1; }
  .signal-panel { order: 3; grid-column: auto; display: block; }
  .signal-score-grid { margin-top: 12px; }
  .signal-bars { margin-top: 15px; }
  .model-window { margin-top: 15px; padding-top: 15px; padding-left: 0; border-left: 0; border-top: 1px solid var(--border); }
  .metric-list { height: 300px; }
  .lower-grid { grid-template-columns: 1fr; }
  .axis-hint { width: 100%; margin-left: 0; }
}

@media (max-width: 560px) {
  .topbar { padding: 9px 10px; align-items: flex-start; }
  .brand-block p { max-width: 180px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
  .top-actions { flex-direction: column-reverse; align-items: flex-end; }
  .upload-button { padding: 0 9px; }
  .top-actions .icon-button { display: none; }
  main { padding: 8px; }
  .kpi-item { padding: 10px; }
  .kpi-value { font-size: 20px; }
  .kpi-context { display: block; }
  .workspace-toolbar { align-items: flex-start; flex-direction: column; }
  .selected-title strong {
    max-width: 100%;
    white-space: normal;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    overflow: hidden;
  }
  .toolbar-controls { width: 100%; justify-content: flex-start; }
  .segmented button { min-width: 36px; padding: 0 6px; }
  #main-chart { height: 390px; }
  .axis-controls label { width: calc(50% - 5px); }
  .axis-controls input { width: 100%; min-width: 0; }
  .axis-controls .secondary-button, .axis-controls .text-button { width: calc(50% - 5px); }
  .signal-score-grid { grid-template-columns: 1fr 1fr; }
  .mini-chart { height: 250px; }
  th, td { padding: 9px 8px; }
}

/* Qinshi industry switch */
.industry-switch {
  display: inline-flex;
  flex: 0 0 auto;
  padding: 3px;
  background: #283a35;
  border: 1px solid #43554f;
  border-radius: 6px;
}
.industry-option {
  min-height: 34px;
  padding: 0 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  border-radius: 4px;
  color: #bfcbc5;
  font-size: 12px;
  text-decoration: none;
  white-space: nowrap;
}
.industry-option:hover { color: #ffffff; }
.industry-option.active {
  background: #f7f9f8;
  color: #1e292c;
  font-weight: 650;
}
.industry-option svg { width: 15px; height: 15px; }
@media (max-width: 560px) {
  .topbar { flex-wrap: wrap; }
  .industry-switch { order: 3; width: 100%; }
  .industry-option { flex: 1 1 0; }
}