:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #dc2626;
  --ok: #16a34a;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --card: #1e293b;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --border: #334155;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }

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

.container { max-width: 640px; margin: 0 auto; padding: 24px 16px 64px; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 24px;
}
.brand { font-size: 22px; font-weight: 700; letter-spacing: 0.5px; }
.userbar { display: flex; align-items: center; gap: 12px; font-size: 14px; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 24px;
}

.card h2 { margin: 0 0 16px; font-size: 18px; }

.tabs { display: flex; gap: 8px; margin-bottom: 18px; }
.tab {
  flex: 1; padding: 10px; border: 1px solid var(--border); border-radius: 10px;
  background: transparent; color: var(--muted); cursor: pointer; font-size: 14px;
  transition: all 0.15s;
}
.tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.tabpane { display: flex; flex-direction: column; gap: 14px; }

label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; color: var(--muted); }
input, textarea {
  font: inherit; padding: 11px 12px; border: 1px solid var(--border);
  border-radius: 10px; background: transparent; color: var(--text);
  outline: none; transition: border-color 0.15s;
}
input:focus, textarea:focus { border-color: var(--primary); }
textarea { resize: vertical; }

button {
  font: inherit; font-weight: 600; padding: 12px 16px; border: none;
  border-radius: 10px; background: var(--primary); color: #fff; cursor: pointer;
  transition: background 0.15s;
}
button:hover:not(:disabled) { background: var(--primary-hover); }
button:disabled { opacity: 0.6; cursor: not-allowed; }

.linkbtn {
  background: transparent; color: var(--primary); padding: 6px 10px;
  font-weight: 500; border-radius: 8px;
}
.linkbtn:hover { background: rgba(37, 99, 235, 0.1); }

.hint { color: var(--muted); font-size: 13px; margin: 0 0 16px; }

.status { margin-top: 14px; font-size: 14px; min-height: 20px; }
.status:empty { margin-top: 0; }

.hidden { display: none !important; }

.code-box {
  margin-top: 14px; padding: 14px; border: 1px dashed var(--primary);
  border-radius: 10px; background: rgba(37, 99, 235, 0.06);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 15px;
  word-break: break-all;
}

table { width: 100%; border-collapse: collapse; margin-top: 12px; font-size: 14px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; }