:root {
  --bg: #0f1420;
  --panel: #171e2e;
  --panel-2: #1d2638;
  --border: #2a3550;
  --text: #e6ebf5;
  --muted: #8b96ad;
  --accent: #4f8cff;
  --accent-2: #6ea8ff;
  --ok: #3ecf8e;
  --warn: #f5b544;
  --danger: #ff5d6c;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  font-size: 14px;
  line-height: 1.6;
}

.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.error-text { color: var(--danger); }
.ok-text { color: var(--ok); }

/* header */
header {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 12px 28px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand { font-weight: 700; font-size: 16px; color: var(--accent-2); white-space: nowrap; }
nav { display: flex; gap: 4px; flex: 1; }
nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: 8px;
}
nav a:hover { color: var(--text); background: var(--panel-2); }
nav a.active { color: var(--text); background: var(--accent); }
.top-right { display: flex; align-items: center; gap: 12px; }

/* layout */
main { max-width: 1080px; margin: 0 auto; padding: 24px 28px 80px; }
.view { display: none; }
.view.active { display: block; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  margin-bottom: 18px;
}
.card h1, .card h2 { margin: 0 0 14px; font-size: 16px; }
.card h2 { font-size: 15px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 820px) { .grid-2 { grid-template-columns: 1fr; } }

.center-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 20px; }
.login-card { width: 340px; }
.login-card h1 { text-align: center; margin-bottom: 4px; color: var(--accent-2); }
.login-card p { text-align: center; margin: 0 0 18px; }

label { display: block; margin-bottom: 14px; color: var(--muted); font-size: 13px; }
input, textarea {
  width: 100%;
  margin-top: 6px;
  padding: 9px 12px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
}
input:focus, textarea:focus { outline: none; border-color: var(--accent); }
textarea { resize: vertical; font-family: ui-monospace, Consolas, monospace; font-size: 12px; }

/* buttons */
.btn {
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 8px 16px;
  font-size: 14px;
  cursor: pointer;
  color: var(--text);
  background: var(--panel-2);
}
.btn:hover { filter: brightness(1.1); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-ghost { background: transparent; border-color: var(--border); }
.btn-block { width: 100%; margin-top: 6px; }
.btn-sm { padding: 4px 10px; font-size: 13px; }

/* stats */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 16px; margin-bottom: 18px; }
.stat { text-align: center; padding: 20px 12px; }
.stat-num { font-size: 30px; font-weight: 700; color: var(--accent-2); }
.stat-label { color: var(--muted); margin-top: 4px; }

.kv { display: flex; justify-content: space-between; border-bottom: 1px dashed var(--border); padding: 8px 0; margin: 0; }

/* table */
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--border); font-size: 13px; }
th { color: var(--muted); font-weight: 500; white-space: nowrap; }
td { vertical-align: middle; }
code { background: var(--panel-2); padding: 1px 6px; border-radius: 5px; font-family: ui-monospace, Consolas, monospace; }
.empty { text-align: center; color: var(--muted); padding: 24px 0; }

.row { display: flex; gap: 10px; }
.pager { display: flex; align-items: center; justify-content: center; gap: 14px; margin-top: 14px; }

/* modal */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.6);
  display: flex; align-items: center; justify-content: center;
  z-index: 100;
}
.modal { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 28px; width: 420px; max-width: 92vw; text-align: center; }
.approve-code { font-family: ui-monospace, Consolas, monospace; font-size: 20px; letter-spacing: 1px; font-weight: 700; color: var(--accent-2); margin: 8px 0; }
.qr-box { display: flex; justify-content: center; margin: 14px 0; padding: 12px; background: #fff; border-radius: 10px; }
.qr-box canvas { image-rendering: pixelated; }
.modal .row { justify-content: center; }

/* toast */
.toast {
  position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%);
  background: var(--panel-2); border: 1px solid var(--border); color: var(--text);
  padding: 10px 20px; border-radius: 10px; z-index: 200;
  box-shadow: 0 6px 24px rgba(0,0,0,.4);
}