:root {
  color-scheme: light;
  --bg: #f3eadf;
  --panel: rgba(255, 248, 240, 0.92);
  --panel-strong: #fffdf8;
  --ink: #211915;
  --muted: #6f6459;
  --accent: #bc5635;
  --accent-strong: #8f381d;
  --line: #dfd1c0;
  --shadow: rgba(93, 58, 29, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.72), transparent 28%),
    radial-gradient(circle at bottom right, rgba(188, 86, 53, 0.16), transparent 26%),
    linear-gradient(160deg, #ece0d2 0%, #f8f3eb 45%, #eadccd 100%);
  color: var(--ink);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.panel {
  width: min(980px, 100%);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 30px;
  padding: 32px;
  box-shadow: 0 24px 60px var(--shadow);
  backdrop-filter: blur(12px);
}

.panel-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  color: var(--accent-strong);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 14px;
  background: rgba(255, 255, 255, 0.72);
}

.eyebrow {
  margin: 0;
  color: var(--accent-strong);
  letter-spacing: 0.08em;
  font-size: 14px;
}

h1 {
  margin: 0;
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1;
}

.subtitle {
  margin: 14px 0 28px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.7;
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.metric {
  padding: 18px;
  border-radius: 20px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
}

.label {
  display: block;
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 8px;
}

.metric strong {
  font-size: clamp(22px, 4vw, 38px);
}

.feedback {
  margin: 24px 0;
  padding: 18px 20px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}

.feedback p {
  margin: 0;
  font-size: 18px;
}

.feedback p + p {
  margin-top: 10px;
  color: var(--muted);
}

.controls-panel {
  margin: 0 0 24px;
}

.speed-control {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 15px;
}

.speed-control select {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 14px;
  background: #fff;
  color: var(--ink);
  font: inherit;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

button {
  border: 0;
  border-radius: 999px;
  padding: 14px 22px;
  font-size: 16px;
  cursor: pointer;
}

.primary {
  background: var(--accent);
  color: white;
}

.secondary {
  background: #efe2d2;
  color: var(--ink);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

@media (max-width: 800px) {
  .panel {
    padding: 24px;
  }

  .panel-top {
    flex-direction: column;
    align-items: flex-start;
  }

  .status-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}