:root {
  --bg: #f3f5f8;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --primary: #0f766e;
  --primary-dark: #115e59;
  --danger: #b91c1c;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 500px at 10% -10%, #ccfbf1 0%, transparent 50%),
    radial-gradient(900px 400px at 100% 0%, #e0f2fe 0%, transparent 45%),
    var(--bg);
  min-height: 100vh;
}
a { color: var(--primary); text-decoration: none; }
.wrap {
  max-width: 460px;
  margin: 48px auto;
  padding: 0 16px 40px;
}
.wide { max-width: 720px; }
.brand {
  text-align: center;
  margin-bottom: 20px;
}
.brand h1 {
  margin: 0;
  font-size: 28px;
  letter-spacing: 0.5px;
}
.brand p { margin: 8px 0 0; color: var(--muted); }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
  padding: 24px;
}
.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
}
.tabs button {
  flex: 1;
  border: 1px solid var(--line);
  background: #f9fafb;
  border-radius: 999px;
  padding: 10px 12px;
  cursor: pointer;
}
.tabs button.active {
  background: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin: 12px 0 6px;
}
input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 12px;
  font-size: 14px;
  outline: none;
}
input:focus { border-color: var(--primary); }
.row { display: flex; gap: 8px; }
.row input { flex: 1; }
button.btn, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  margin-top: 16px;
  border: none;
  border-radius: 10px;
  padding: 12px 14px;
  background: var(--primary);
  color: #fff;
  font-size: 15px;
  cursor: pointer;
}
button.btn:hover { background: var(--primary-dark); }
button.btn.secondary, .btn.secondary {
  background: #fff;
  color: var(--text);
  border: 1px solid var(--line);
}
button.btn.ghost {
  width: auto;
  margin-top: 0;
  background: #ecfdf5;
  color: var(--primary-dark);
}
.oauth {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 14px;
}
.msg {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 13px;
  display: none;
}
.msg.error { display: block; background: #fef2f2; color: var(--danger); }
.msg.ok { display: block; background: #ecfdf5; color: #065f46; }
.hint {
  margin-top: 14px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}
.banner {
  margin-bottom: 14px;
  padding: 10px 12px;
  border-radius: 8px;
  background: #fff7ed;
  color: #9a3412;
  font-size: 13px;
  display: none;
}
.banner.show { display: block; }
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.item {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  background: #fafafa;
}
.item h3 { margin: 0 0 8px; font-size: 15px; }
.item p { margin: 0; color: var(--muted); font-size: 13px; word-break: break-all; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.switch {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}
@media (max-width: 640px) {
  .grid { grid-template-columns: 1fr; }
  .oauth { grid-template-columns: 1fr; }
}