:root {
  --bg: #e9eeeb;
  --panel: #fbfcfb;
  --ink: #18221f;
  --muted: #5f6f6a;
  --line: #d0dad5;
  --accent: #0f6b5c;
  --warn: #9b2c2c;
  --font: "Segoe UI", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
}
* { box-sizing: border-box; }
body.admin {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
}
.shell { display: grid; grid-template-columns: 220px 1fr; min-height: 100vh; }
.nav {
  background: #10241f;
  color: #e8f2ef;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.nav .brand { font-weight: 700; margin: 0 0 16px; }
.nav a { color: #cfe3dc; text-decoration: none; padding: 8px 10px; border-radius: 8px; }
.nav a:hover { background: rgba(255,255,255,0.08); }
.panel { padding: 28px 32px; }
.panel.narrow { max-width: 420px; margin: 10vh auto; background: var(--panel); padding: 28px; border-radius: 14px; border: 1px solid var(--line); }
.muted { color: var(--muted); }
.err { color: var(--warn); }
label { display: grid; gap: 6px; margin: 12px 0; font-size: 0.92rem; }
input[type=text], input[type=password], input[type=number], textarea, select {
  padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; font: inherit;
}
button, .btn {
  appearance: none; border: 0; background: var(--accent); color: #fff;
  padding: 10px 14px; border-radius: 8px; font: inherit; cursor: pointer; text-decoration: none; display: inline-block;
}
table { width: 100%; border-collapse: collapse; background: var(--panel); }
th, td { border-bottom: 1px solid var(--line); padding: 10px 8px; text-align: left; font-size: 0.92rem; vertical-align: top; }
.steps { list-style: none; padding: 0; margin: 20px 0; display: grid; gap: 10px; }
.steps a {
  display: flex; justify-content: space-between; align-items: center;
  padding: 14px 16px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
  text-decoration: none; color: inherit;
}
.steps .done a { border-color: #9ec9bc; }
.steps .todo a { border-style: dashed; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 24px 0; }
.stats div {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px;
  display: grid; gap: 4px;
}
.stats strong { font-size: 1.6rem; }
.form-grid { display: grid; gap: 8px; max-width: 520px; margin-bottom: 24px; }
.flash { padding: 10px 12px; background: #e7f5f0; border-radius: 8px; margin-bottom: 16px; }
code { font-size: 0.85em; word-break: break-all; }
@media (max-width: 800px) {
  .shell { grid-template-columns: 1fr; }
  .nav { flex-direction: row; flex-wrap: wrap; }
}