:root {
  --bg: #0f1115;
  --card: #1a1d24;
  --fg: #e8eaed;
  --muted: #9aa0aa;
  --accent: #4f7cff;
  --accent-hover: #3d68e6;
  --error: #ff6b6b;
  --border: #2a2e37;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.5 -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  padding: 24px;
}
.card {
  width: 100%;
  max-width: 360px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 32px 28px;
}
.brand { color: var(--muted); font-size: 13px; letter-spacing: .04em; margin-bottom: 20px; }
h1 { margin: 0 0 20px; font-size: 22px; }
h2 { margin: 24px 0 8px; font-size: 17px; }
label { display: block; margin-bottom: 16px; font-size: 13px; color: var(--muted); }
input {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 11px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #12151b;
  color: var(--fg);
  font-size: 15px;
}
input:focus { outline: none; border-color: var(--accent); }
button {
  width: 100%;
  padding: 11px 12px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
}
button:hover { background: var(--accent-hover); }
button.secondary { background: transparent; border: 1px solid var(--border); color: var(--fg); }
.error {
  margin: 0 0 16px;
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(255, 107, 107, .12);
  color: var(--error);
  font-size: 13px;
}
.alt { margin: 18px 0 0; font-size: 13px; color: var(--muted); text-align: center; }
.alt a, a { color: var(--accent); text-decoration: none; }
.alt a:hover, a:hover { text-decoration: underline; }
.muted { color: var(--muted); font-size: 13px; }
.account-email { font-size: 17px; font-weight: 600; margin: 0 0 4px; }
code { background: #12151b; padding: 1px 5px; border-radius: 4px; font-size: 12px; }
.key-notice { margin: 16px 0; padding: 12px; border: 1px solid var(--accent); border-radius: 8px; background: rgba(79,124,255,.1); }
.key-notice p { margin: 0 0 8px; font-size: 13px; }
.key-notice code { display: block; overflow-wrap: anywhere; }
.key-list { margin-top: 24px; border-top: 1px solid var(--border); }
.key-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 0; border-bottom: 1px solid var(--border); }
.key-row form { flex: 0 0 auto; }
.key-row button { width: auto; padding: 7px 10px; font-size: 12px; }

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f5f7; --card: #fff; --fg: #1a1d24; --muted: #6b7280;
    --border: #e2e5ea;
  }
  input { background: #fff; }
  code { background: #f0f1f3; }
}