:root {
  --bg: #0f1419;
  --panel: #1a222c;
  --text: #e8eef4;
  --muted: #9aa8b5;
  --accent: #3d9a6a;
  --line: #2a3542;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 10% -10%, #1d3a2e 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #243044 0%, transparent 50%),
    var(--bg);
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  width: min(880px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 4rem;
}
header {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1rem;
  margin-bottom: 2rem;
}
.brand { font-size: 1.5rem; font-weight: 700; letter-spacing: 0.02em; }
.brand span { color: var(--muted); font-weight: 500; font-size: 0.95rem; margin-left: 0.5rem; }
nav { display: flex; gap: 1rem; flex-wrap: wrap; }
nav a { color: var(--text); opacity: 0.85; }
nav a[aria-current="page"] { color: var(--accent); opacity: 1; }

h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); margin: 0 0 0.75rem; }
.lead { color: var(--muted); line-height: 1.6; margin: 0 0 1.5rem; max-width: 40rem; }

.panel {
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.25rem 1.35rem;
  margin: 1rem 0;
}
.grid { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1rem;
  background: #141b23;
}
.card h2 { margin: 0 0 0.4rem; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.92rem; line-height: 1.5; }

label { display: block; margin: 0.75rem 0 0.35rem; color: var(--muted); font-size: 0.9rem; }
input, textarea, button {
  font: inherit;
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #10161d;
  color: var(--text);
  padding: 0.65rem 0.75rem;
}
textarea { min-height: 6rem; resize: vertical; }
button {
  width: auto;
  margin-top: 1rem;
  background: var(--accent);
  border-color: transparent;
  color: #04140c;
  font-weight: 600;
  cursor: pointer;
  padding-inline: 1.1rem;
}
button:hover { filter: brightness(1.08); }
pre {
  overflow: auto;
  background: #0c1117;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.85rem;
  font-size: 0.82rem;
  color: #c5d4e0;
}
.ok { color: #6dcea0; }
.bad { color: #e88b8b; }
footer { margin-top: 2.5rem; color: var(--muted); font-size: 0.85rem; }