:root {
  --bg: #060b18;
  --card: rgba(18, 32, 66, 0.55);
  --border: #1d3a6e;
  --accent: #3d7bfd;
  --accent2: #2563eb;
  --text: #dbe6ff;
  --dim: #7f93bd;
  --ok: #34d399;
  --bad: #f87171;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: radial-gradient(1200px 600px at 70% 110%, #10204a 0%, var(--bg) 55%);
  color: var(--text);
  font-family: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  min-height: 100vh;
  padding: 24px 16px 64px;
}
.wrap { max-width: 640px; margin: 0 auto; }
h1 { font-size: 20px; font-weight: 600; }
.dim { color: var(--dim); font-size: 13px; }
.mono { font-family: Consolas, monospace; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  margin-top: 16px;
  backdrop-filter: blur(4px);
}
.card-title { font-size: 15px; font-weight: 600; margin-bottom: 10px; }

button {
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  color: #fff; border: none; border-radius: 12px;
  padding: 12px 20px; font-size: 15px; cursor: pointer;
  box-shadow: 0 0 18px rgba(61, 123, 253, 0.35);
}
button:disabled { opacity: 0.45; cursor: default; box-shadow: none; }
button.ghost { background: transparent; border: 1px solid var(--border); box-shadow: none; color: var(--dim); }
input {
  background: #0a1428; border: 1px solid var(--border); color: var(--text);
  border-radius: 10px; padding: 10px 12px; font-size: 15px; width: 140px;
}

/* NFC 圆圈动画（读卡端） */
.nfc-ring {
  width: 150px; height: 150px; margin: 18px auto; border-radius: 50%;
  border: 2px solid var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 40px; color: var(--accent);
  box-shadow: 0 0 30px rgba(61, 123, 253, 0.25), inset 0 0 30px rgba(61, 123, 253, 0.12);
  animation: pulse 2s infinite;
}
.nfc-ring.active { border-color: var(--ok); color: var(--ok); box-shadow: 0 0 34px rgba(52, 211, 153, 0.4); }
@keyframes pulse { 50% { box-shadow: 0 0 44px rgba(61, 123, 253, 0.5); } }

.status-chip {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--border); border-radius: 999px;
  padding: 5px 12px; font-size: 13px; color: var(--dim); margin-right: 8px;
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: #475569; }
.status-chip.on { color: var(--ok); border-color: #14532d; }
.status-chip.on .dot { background: var(--ok); box-shadow: 0 0 8px var(--ok); }

.brand-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.brand {
  border: 1px solid var(--border); border-radius: 10px; padding: 8px 14px;
  font-weight: 700; font-size: 13px; color: var(--text); background: #0c1730;
  letter-spacing: 0.5px;
}

/* 日志面板 */
#log {
  margin-top: 14px; max-height: 340px; overflow-y: auto;
  font-family: Consolas, monospace; font-size: 12px;
}
.log-row {
  display: grid; grid-template-columns: 92px 22px 1fr; gap: 4px;
  padding: 7px 8px; border-bottom: 1px solid #12203f; align-items: baseline;
}
.log-t { color: var(--dim); }
.log-dir.out { color: var(--accent); }
.log-dir.in { color: var(--ok); }
.log-label { color: var(--text); }
.log-hex { grid-column: 3 / 5; color: var(--dim); word-break: break-all; }
.log-ms { color: #facc15; text-align: right; }

.result-ok, .result-bad {
  margin-top: 14px; border-radius: 12px; padding: 14px; font-size: 14px; display: none;
}
.result-ok { border: 1px solid #14532d; background: rgba(52, 211, 153, 0.08); color: var(--ok); }
.result-bad { border: 1px solid #7f1d1d; background: rgba(248, 113, 113, 0.08); color: var(--bad); }

table.feed { width: 100%; border-collapse: collapse; font-size: 12px; font-family: Consolas, monospace; }
table.feed td { padding: 6px 8px; border-bottom: 1px solid #12203f; vertical-align: top; word-break: break-all; }
table.feed td:first-child { color: var(--dim); white-space: nowrap; }

a.btn-link {
  display: block; text-decoration: none; color: var(--text);
  border: 1px solid var(--border); border-radius: 14px; padding: 16px 18px; margin-top: 12px;
  background: var(--card);
}
a.btn-link:hover { border-color: var(--accent); }
a.btn-link b { color: var(--accent); }

.flow { display: flex; align-items: center; justify-content: space-between; gap: 6px; margin-top: 14px; flex-wrap: wrap; }
.flow .node {
  border: 1px solid var(--border); border-radius: 12px; padding: 10px 12px;
  font-size: 12px; text-align: center; background: #0c1730; flex: 1; min-width: 90px;
}
.flow .arrow { color: var(--accent); font-size: 18px; }
.notice { margin-top: 20px; font-size: 12px; color: var(--dim); line-height: 1.7; }