:root {
  --ink: #1b1f24;
  --muted: #666f7a;
  --line: #dfe3e8;
  --bg: #fbfbfc;
  --panel: #ffffff;
  --accent: #2f6f5e;
  --accent-ink: #ffffff;
  --warn: #8a3b2f;
  --band: rgba(47, 111, 94, 0.14);
  --grid: #eceef1;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 20px 40px;
  background: var(--bg);
  color: var(--ink);
  font: 15px/1.55 -apple-system, "Segoe UI", "Noto Sans SC", "PingFang SC", sans-serif;
}

header, main, footer { max-width: 920px; margin: 0 auto; }

header { padding: 28px 0 12px; }
h1 { margin: 0; font-size: 22px; letter-spacing: -0.01em; }
h2 { font-size: 16px; margin: 0 0 8px; }
.sub { margin: 4px 0 0; color: var(--muted); font-size: 13px; }

.status {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--muted);
}
.status.ok { color: var(--accent); }
.status.bad { color: var(--warn); }

form, section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}

label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }

textarea, input[type="number"], input[type="password"] {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font: 14px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace;
  background: #fff;
  color: var(--ink);
}

textarea:focus, input:focus, button:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.row { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 14px; align-items: flex-end; }
.field { flex: 1 1 180px; }
.field.actions { flex: 0 0 auto; }

button {
  padding: 10px 22px;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}
button:disabled { opacity: 0.55; cursor: progress; }

fieldset {
  margin: 16px 0 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}
legend { font-size: 13px; color: var(--muted); padding: 0 4px; }
.check { display: inline-flex; gap: 5px; align-items: center; margin: 0; font-size: 13px; color: var(--ink); }
.hint { font-size: 12px; color: var(--muted); }

.meta { font-size: 13px; color: var(--muted); margin: 0 0 12px; }

canvas { width: 100%; height: auto; display: block; }

details { margin-top: 14px; }
summary { cursor: pointer; font-size: 13px; color: var(--muted); }

table { border-collapse: collapse; margin-top: 10px; font: 13px ui-monospace, monospace; }
th, td { border: 1px solid var(--line); padding: 4px 9px; text-align: right; }
th { background: #f4f6f7; font-weight: 600; }

pre {
  margin: 0;
  padding: 12px;
  background: #fdf2f0;
  border: 1px solid #f0d6d0;
  border-radius: 6px;
  color: var(--warn);
  font: 12.5px/1.5 ui-monospace, monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

footer {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--muted);
}
footer a { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; }
footer .note { margin-left: auto; }