:root {
  --bg: #070a14;
  --panel: rgba(14, 19, 34, 0.78);
  --line: rgba(255, 255, 255, 0.1);
  --ink: #e8edf8;
  --muted: #8a94ad;
  --accent: #7dd3fc;
  --accent-2: #c084fc;
  --class-a: #4ea1ff;
  --class-b: #ff8a5c;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(1100px 560px at 8% -12%, rgba(125, 211, 252, 0.09), transparent 60%),
    radial-gradient(900px 520px at 96% 4%, rgba(192, 132, 252, 0.09), transparent 58%),
    var(--bg);
  color: var(--ink);
  font: 14px/1.55 "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
}

code, .stats b, .meta b {
  font-family: ui-monospace, "SFMono-Regular", "Cascadia Code", Consolas, monospace;
  font-variant-numeric: tabular-nums;
}

.app { max-width: 1400px; margin: 0 auto; padding: 22px 22px 44px; }

/* ---------------- 顶栏 ---------------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand h1 { margin: 0; font-size: 21px; letter-spacing: 0.1em; text-transform: uppercase; }
.brand p { margin: 1px 0 0; font-size: 12px; color: var(--muted); }

.brand__dot {
  width: 12px; height: 12px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 18px rgba(125, 211, 252, 0.75);
  animation: breathe 2.4s ease-in-out infinite;
}
.brand__dot.paused { animation: none; background: #ffcc66; box-shadow: 0 0 16px #ffcc66; }
@keyframes breathe {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.3); opacity: 0.7; }
}

.stats {
  display: grid;
  grid-auto-flow: column;
  gap: 18px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  backdrop-filter: blur(10px);
}
.stats div { display: grid; gap: 1px; text-align: right; }
.stats span { font-size: 10px; letter-spacing: 0.14em; color: var(--muted); text-transform: uppercase; }
.stats b { font-size: 15px; }

/* ---------------- 布局 ---------------- */

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 424px;
  gap: 18px;
  align-items: start;
}

/* ---------------- 决策边界 ---------------- */

.plot {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 12px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.045), rgba(0, 0, 0, 0.3));
  box-shadow: 0 20px 46px rgba(0, 0, 0, 0.45);
}

#field {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 10px;
  background: #080b16;
}

.plot__legend {
  position: absolute;
  left: 22px;
  bottom: 22px;
  display: flex;
  gap: 14px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 99px;
  background: rgba(8, 11, 22, 0.72);
  backdrop-filter: blur(8px);
  font-size: 11.5px;
  color: var(--muted);
}
.plot__legend span { display: inline-flex; align-items: center; gap: 6px; }
.swatch { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.swatch--a { background: var(--class-a); }
.swatch--b { background: var(--class-b); }
.swatch--test { background: transparent; border: 2px solid #fff; }

.plot__caption {
  margin: 12px 4px 0;
  font-size: 12.5px;
  color: var(--muted);
  min-height: 20px;
}

/* ---------------- 侧栏 ---------------- */

.side { display: grid; gap: 14px; }

.card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  backdrop-filter: blur(10px);
  overflow: hidden;
}
.card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
}
.card__head h2 {
  margin: 0;
  font-size: 10.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}
.card__body { display: grid; gap: 12px; padding: 13px 14px 15px; }

.tag {
  padding: 2px 9px;
  border: 1px solid var(--line);
  border-radius: 99px;
  font-size: 10.5px;
  color: var(--muted);
}
.tag.ok { color: var(--accent); border-color: rgba(125, 211, 252, 0.45); }
.tag.warn { color: #ffcc66; border-color: rgba(255, 204, 102, 0.4); }

#chart {
  display: block;
  width: 100%;
  height: 170px;
  background: rgba(0, 0, 0, 0.18);
}

.chart-legend {
  display: flex;
  gap: 14px;
  padding: 0 14px 12px;
  font-size: 11px;
  color: var(--muted);
}
.chart-legend span { display: inline-flex; align-items: center; gap: 6px; }
.line { width: 16px; height: 3px; border-radius: 2px; display: inline-block; }
.line--train { background: var(--accent); }
.line--test { background: var(--accent-2); }
.line--acc { background: #6ee7a8; }

.group { display: grid; gap: 8px; }
.group__label { font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase; color: var(--muted); }
.row { display: flex; flex-wrap: wrap; gap: 8px; }

button {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--ink);
  font: inherit;
  font-size: 12.5px;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.18s ease, border-color 0.18s ease;
}
button:hover { background: rgba(255, 255, 255, 0.12); transform: translateY(-1px); }
button:active { transform: translateY(0) scale(0.98); }
button.primary { border-color: rgba(125, 211, 252, 0.45); background: rgba(125, 211, 252, 0.16); }
button.on { border-color: rgba(192, 132, 252, 0.5); background: rgba(192, 132, 252, 0.18); }

.ctl { display: grid; gap: 6px; font-size: 12px; color: var(--muted); }
.ctl span { display: flex; justify-content: space-between; gap: 8px; }
.ctl b { color: var(--ink); }

.two { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 15px; height: 15px; border-radius: 50%;
  background: #0b0f18; border: 2px solid #fff;
  box-shadow: 0 0 10px rgba(125, 211, 252, 0.75);
  cursor: pointer;
}

select {
  width: 100%;
  padding: 7px 9px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #0d1220;
  color: var(--ink);
  font: inherit;
  font-size: 12.5px;
}

.meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}
.meta div { padding: 8px 10px; border-radius: 9px; background: rgba(255, 255, 255, 0.04); }
.meta span { display: block; font-size: 10px; letter-spacing: 0.1em; color: var(--muted); }
.meta b { font-size: 14px; }

.hint { margin: 0; font-size: 11.5px; line-height: 1.75; color: var(--muted); }
.hint code {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.07);
  padding: 1px 5px;
  border-radius: 5px;
}

/* ---------------- 提示条 ---------------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translate(-50%, 12px);
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 99px;
  background: var(--panel);
  backdrop-filter: blur(12px);
  font-size: 12.5px;
  opacity: 0;
  transition: opacity 0.22s ease, transform 0.22s ease;
  pointer-events: none;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 1080px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 560px) {
  .app { padding: 14px; }
  .stats { gap: 12px; padding: 8px 12px; }
  .stats div:nth-child(4) { display: none; }
  .two-col { grid-template-columns: 1fr; }
}