:root {
  color-scheme: dark;
  --bg: #07111f;
  --text: #f4f7ff;
  --muted: #9fb0c9;
  --accent: #4cc9f0;
  --accent-strong: #2ec4b6;
  --accent-soft: rgba(76, 201, 240, 0.18);
  --warning: #ffb703;
  --danger: #ff6b6b;
  --border: rgba(255, 255, 255, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: linear-gradient(135deg, #07111f 0%, #16325f 50%, #0f172a 100%);
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 24px;
}

.app-shell {
  width: min(1040px, 100%);
  padding: 32px;
  border-radius: 28px;
  background: rgba(8, 16, 32, 0.92);
  border: 1px solid var(--border);
  box-shadow: 0 25px 70px rgba(0, 0, 0, 0.28);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.topbar h1 {
  margin: 6px 0 0;
  font-size: 1.8rem;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 700;
}

.pill-accent {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
}

.layout {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 20px;
}

.card {
  padding: 24px;
  border-radius: 24px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.03));
  border: 1px solid var(--border);
}

.monitor-head,
.insight-box {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.monitor-head {
  align-items: center;
  margin-bottom: 18px;
}

.signal-ring {
  display: grid;
  place-items: center;
  min-height: 220px;
  border-radius: 24px;
  background: radial-gradient(circle at top, rgba(76, 201, 240, 0.18), transparent 60%), rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
  padding: 20px;
}

.signal-value {
  font-size: clamp(3rem, 7vw, 5rem);
  font-weight: 800;
  letter-spacing: 0.04em;
}

.signal-label {
  margin-top: 6px;
  color: var(--muted);
}

.hint,
.settings-copy,
.status {
  color: var(--muted);
  line-height: 1.7;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 20px 0;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 12px 18px;
  cursor: pointer;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #04121f;
  box-shadow: 0 12px 30px rgba(76, 201, 240, 0.24);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.stats-grid > div {
  padding: 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
}

.stats-grid strong {
  display: block;
  font-size: 1.2rem;
  margin-bottom: 4px;
}

.stats-grid span {
  color: var(--muted);
  font-size: 0.9rem;
}

.insights-card h3,
.settings-card h3 {
  margin: 0 0 16px;
  font-size: 1.2rem;
}

.insight-box {
  flex-direction: column;
  padding: 14px;
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.04);
  margin-bottom: 12px;
}

.insight-box strong {
  margin: 6px 0;
  font-size: 1rem;
}

.insight-box span,
.insight-box li {
  color: var(--muted);
  line-height: 1.6;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
}

.field span {
  color: var(--muted);
}

.field input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-size: 1rem;
}

.action-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.data-row {
  margin-top: 12px;
}

.file-btn {
  position: relative;
  overflow: hidden;
}

.file-btn input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.status {
  margin-top: 16px;
  font-size: 0.95rem;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .app-shell {
    padding: 20px;
  }

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

  .controls,
  .action-row {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}