:root {
  --bg: #0f1419;
  --panel: #1a2028;
  --panel-2: #232b36;
  --border: #2d3744;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --muted: #94a3b8;
  --accent: #3dd68c;
  --accent-2: #4a9eff;
  --accent-grad: #2eb878;
  --warn: #f6ad55;
  --danger: #fc8181;
  --pareto: #3dd68c;
  --pareto-line: #3dd68c;
  --dominated: #4b5563;
  --good: #3dd68c;
  --grid: #2d3744;
  --grid-line: rgba(148,163,184,0.08);
  --canvas-bg: #131820;
  --chart-bg: #131820;
  --hover-bg: #2a3441;
  --hover-row: rgba(255,255,255,0.02);
  --on-accent: #0f1419;
  --shadow: 0 4px 12px rgba(0,0,0,0.3);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.5;
  height: 100vh;
  overflow: hidden;
}
body { display: flex; flex-direction: column; }

/* header */
header {
  background: linear-gradient(135deg, var(--panel) 0%, var(--panel-2) 100%);
  border-bottom: 1px solid var(--border);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  flex-shrink: 0;
}
header .titles { min-width: 0; flex: 1; }
header h1 {
  font-size: 18px;
  font-weight: 600;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
header .subtitle {
  color: var(--text-dim);
  font-size: 12px;
  margin-top: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
header .actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* main layout */
main {
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 16px 20px;
  display: grid;
  grid-template-columns: minmax(360px, 440px) 1fr;
  gap: 16px;
  align-items: stretch;
  flex: 1;
  min-height: 0;
}
@media (max-width: 900px) {
  html, body { height: auto; min-height: 100vh; overflow: auto; }
  body { display: block; }
  main { grid-template-columns: 1fr; flex: none; }
  .panel { min-height: 360px; }
  .scroll { min-height: 160px; }
  .chart-wrap, svg.chart { min-height: 320px; }
}

/* panels */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.panel h2 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
  flex-shrink: 0;
}
.panel h2 .badge {
  background: var(--panel-2);
  color: var(--text-dim);
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: normal;
  text-transform: none;
  letter-spacing: 0;
}
.panel h2 .sub {
  color: var(--text-dim);
  font-size: 11px;
  font-weight: normal;
  text-transform: none;
  letter-spacing: 0;
}

/* form controls */
label { display: block; font-size: 12px; color: var(--text-dim); margin-bottom: 4px; }
input, select, button {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 7px 10px;
  border-radius: 5px;
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s, background 0.15s;
}
input:focus, select:focus { border-color: var(--accent-2); }
button {
  cursor: pointer;
  padding: 7px 14px;
  white-space: nowrap;
}
button:hover { border-color: var(--accent-2); background: var(--hover-bg); }
button.primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-grad) 100%);
  border-color: transparent;
  color: var(--on-accent);
  font-weight: 600;
}
button.primary:hover { filter: brightness(1.1); background: linear-gradient(135deg, var(--accent) 0%, var(--accent-grad) 100%); }
button.danger { color: var(--danger); }
button.danger:hover { border-color: var(--danger); background: rgba(252,129,129,0.1); }
button.small { padding: 4px 10px; font-size: 12px; }
button.ghost { background: transparent; }

/* options row */
.opts { display: flex; gap: 12px; align-items: center; font-size: 12px; color: var(--text-dim); flex-wrap: wrap; }
.opts label { display: inline-flex; gap: 6px; align-items: center; margin: 0; cursor: pointer; }
.opts input[type=checkbox] { accent-color: var(--accent-2); width: auto; padding: 0; }
.opts select { padding: 4px 8px; font-size: 12px; cursor: pointer; }
.opts select:focus { border-color: var(--accent-2); }
.opts .seg-label { color: var(--text-dim); }

/* table */
.scroll { flex: 1; min-height: 0; overflow-y: auto; }
.scroll::-webkit-scrollbar { width: 6px; }
.scroll::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
table.data { width: 100%; border-collapse: collapse; font-size: 12px; }
table.data th, table.data td {
  padding: 6px 8px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
table.data th {
  color: var(--text-dim);
  font-weight: 500;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  position: sticky;
  top: 0;
  background: var(--panel-2);
  z-index: 1;
}
table.data th:first-child { width: 34px; text-align: center; }
table.data th.cost { color: var(--accent-2); }
table.data th.benefit { color: var(--accent); }
table.data td input {
  width: 100%;
  padding: 4px 6px;
  font-size: 12px;
  background: var(--canvas-bg);
  border: 1px solid var(--border);
}
table.data td input.num { text-align: right; font-family: "SF Mono", Monaco, Consolas, monospace; }
table.data td.idx { text-align: center; color: var(--text-dim); font-family: "SF Mono", Monaco, Consolas, monospace; }
table.data tr:hover { background: var(--hover-row); }
table.data tr.pareto-row td { background: rgba(61,214,140,0.07); }
table.data tr.pareto-row td.idx { color: var(--accent); font-weight: 700; }
table.data tr.dominated-row td { opacity: 0.55; }
.del-btn {
  background: transparent;
  border: none;
  color: var(--text-dim);
  padding: 2px 6px;
  cursor: pointer;
  font-size: 15px;
  line-height: 1;
}
.del-btn:hover { color: var(--danger); }

/* toolbar */
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; flex-shrink: 0; }

/* stats */
.summary { margin-top: 14px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; flex-shrink: 0; }
.stat {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
}
.stat .k { color: var(--text-dim); font-size: 11px; text-transform: uppercase; letter-spacing: 0.4px; }
.stat .v { font-size: 18px; font-weight: 600; margin-top: 2px; font-family: "SF Mono", Monaco, Consolas, monospace; }
.stat.pareto .v { color: var(--accent); }
.stat.dom .v { color: var(--text-dim); }

/* chart */
.chart-wrap { position: relative; background: var(--panel-2); border-radius: 6px; padding: 8px; flex: 1; min-height: 0; display: flex; }
svg.chart { width: 100%; height: 100%; min-height: 0; display: block; background: var(--canvas-bg); border-radius: 4px; }
.legend {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  padding: 10px 2px 0;
  font-size: 12px;
  color: var(--text-dim);
  flex-shrink: 0;
}
.legend .item { display: inline-flex; align-items: center; gap: 6px; }
.legend .swatch { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.legend .line-swatch { width: 18px; height: 3px; border-radius: 2px; display: inline-block; }

#tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 12px;
  color: var(--text);
  box-shadow: var(--shadow);
  opacity: 0;
  transition: opacity 0.12s;
  white-space: nowrap;
  z-index: 5;
}
#tooltip .t-name { font-weight: 600; margin-bottom: 4px; }
#tooltip .t-row { color: var(--text-dim); }
#tooltip .t-row b { color: var(--text); font-family: "SF Mono", Monaco, Consolas, monospace; }
#tooltip .t-tag {
  display: inline-block; margin-top: 4px;
  padding: 1px 7px; border-radius: 10px; font-size: 11px; font-weight: 600;
}
#tooltip .t-tag.p { background: rgba(61,214,140,0.15); color: var(--accent); }
#tooltip .t-tag.d { background: rgba(148,163,184,0.15); color: var(--text-dim); }

/* toast */
.toast {
  position: fixed; bottom: 20px; left: 50%; transform: translateX(-50%);
  background: var(--panel-2); border: 1px solid var(--border);
  color: var(--text); padding: 10px 18px; border-radius: 6px;
  font-size: 13px; box-shadow: var(--shadow); opacity: 0;
  transition: opacity 0.2s, transform 0.2s; z-index: 50; pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(-4px); }

/* light theme */
:root[data-theme="light"] {
  --bg: #f4f6f9;
  --panel: #ffffff;
  --panel-2: #eef2f7;
  --border: #d6dde6;
  --text: #1e293b;
  --text-dim: #64748b;
  --muted: #64748b;
  --accent: #1ea86a;
  --accent-2: #2b7de9;
  --accent-grad: #168a55;
  --warn: #d97706;
  --danger: #e23b3b;
  --pareto: #1ea86a;
  --pareto-line: #1ea86a;
  --dominated: #94a3b8;
  --good: #1ea86a;
  --grid: #d6dde6;
  --grid-line: rgba(15,23,42,0.08);
  --canvas-bg: #ffffff;
  --chart-bg: #ffffff;
  --hover-bg: #e2e8f0;
  --hover-row: rgba(15,23,42,0.04);
  --on-accent: #ffffff;
  --shadow: 0 4px 12px rgba(15,23,42,0.08);
}
:root[data-theme="light"] .toast { box-shadow: 0 4px 12px rgba(15,23,42,0.15); }
:root[data-theme="light"] table.data td input { background: #f4f6f9; }
:root[data-theme="light"] svg.chart { background: #fff; }