:root {
  --bg: #f3f6fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #0b6ef7;
  --border: #dbe4f0;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  background: radial-gradient(circle at 10% 10%, #e9f2ff, var(--bg));
  color: var(--text);
}

.auth-shell {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 24px;
}

.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 12px 30px rgba(16, 24, 40, 0.08);
}

.auth-card h1 {
  margin: 0;
  font-size: 22px;
}

.desc {
  margin: 8px 0 18px;
  color: var(--muted);
  font-size: 14px;
}

.tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 14px;
}

.tab {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
}

.tab.active {
  border-color: var(--primary);
  color: var(--primary);
}

.panel { display: none; }
.panel.active { display: block; }

label {
  display: block;
  margin: 10px 0 6px;
  font-size: 14px;
}

input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
}

.password-wrap {
  position: relative;
}

.password-wrap input {
  padding-right: 64px;
}

.toggle-password-btn {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  border: 1px solid var(--border);
  background: #fff;
  color: #475569;
  border-radius: 8px;
  padding: 4px 8px;
  font-size: 12px;
  cursor: pointer;
}

.toggle-password-btn:hover {
  border-color: #b8c8df;
}

button[type="submit"] {
  width: 100%;
  border: 0;
  border-radius: 10px;
  padding: 11px;
  margin-top: 14px;
  font-weight: 600;
  color: #fff;
  background: var(--primary);
  cursor: pointer;
}

.msg {
  min-height: 20px;
  margin-top: 12px;
  font-size: 14px;
  color: #dc2626;
}

.msg.ok {
  color: #16a34a;
}

.guest-entry {
  margin-top: 10px;
  border-top: 1px dashed var(--border);
  padding-top: 12px;
}

.guest-btn {
  width: 100%;
  border: 1px solid #cbd5e1;
  border-radius: 10px;
  padding: 10px;
  background: #fff;
  color: #1e293b;
  font-weight: 600;
  cursor: pointer;
}

.guest-btn:hover {
  border-color: #3b82f6;
  color: #1d4ed8;
}

.guest-entry p {
  margin: 8px 0 0;
  color: #64748b;
  font-size: 12px;
  line-height: 1.5;
}