* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  color: #0f172a;
  background: #f8fafc;
}

a {
  color: #0b5ed7;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.topbar {
  background: #0b1220;
  color: #f8fafc;
  padding: 0.9rem 0;
}

.topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.topbar h1 {
  margin: 0;
  font-size: 1.2rem;
}

.topbar nav {
  display: flex;
  gap: 1rem;
}

.topbar nav a {
  color: #cbd5e1;
}

.hero {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 2rem;
  margin: 1.4rem 0;
}

.hero h2 {
  margin: 0.2rem 0 0.8rem;
}

.tag {
  color: #334155;
  font-size: 0.95rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1rem;
}

.btn {
  display: inline-block;
  border-radius: 8px;
  padding: 0.6rem 1rem;
  background: #0b5ed7;
  color: #fff;
  border: 1px solid #0b5ed7;
}

.btn:hover {
  text-decoration: none;
  opacity: 0.92;
}

.btn.ghost {
  background: #fff;
  color: #0b5ed7;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 1rem;
}

footer {
  border-top: 1px solid #e2e8f0;
  padding: 1rem 0;
  color: #475569;
}

.section-title {
  margin: 1.4rem 0 0.6rem;
}

.two-col {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 1rem;
}

.panel {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 1rem;
}

label {
  display: block;
  margin-top: 0.7rem;
  font-size: 0.92rem;
}

input[type="range"],
input[type="number"],
input[type="text"],
select {
  width: 100%;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.8rem;
}

th, td {
  border: 1px solid #dbe3ef;
  padding: 0.45rem 0.5rem;
  text-align: left;
}

th {
  background: #f1f5f9;
}

canvas {
  width: 100%;
  max-width: 100%;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  background: #020617;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.7rem;
}

.metric {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 0.6rem;
}

.muted {
  color: #64748b;
  font-size: 0.9rem;
}

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