/* PainRadar 认证页面（登录/注册/忘记密码/重置密码）+ 历史/升级页共用 — 浅色主题 */
:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --border: #e5e7eb;
  --text: #1f2937;
  --muted: #6b7280;
  --indigo: #6366f1;
  --purple: #a855f7;
  --pink: #ec4899;
  --error: #dc2626;
  --ok: #059669;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: radial-gradient(1200px 600px at 80% -10%, rgba(99, 102, 241, 0.1), transparent 60%),
              radial-gradient(900px 500px at 10% 110%, rgba(168, 85, 247, 0.08), transparent 60%),
              var(--bg);
  color: var(--text);
  min-height: 100vh;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
}
.brand {
  color: var(--text);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.2px;
  text-decoration: none;
  background: linear-gradient(90deg, var(--indigo), var(--purple));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav-links { display: flex; align-items: center; gap: 16px; }
.auth-wrap {
  display: flex;
  justify-content: center;
  padding: 48px 16px;
}
.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 36px 32px;
  box-shadow: 0 12px 40px rgba(31, 41, 55, 0.08);
}
.auth-card h1 {
  font-size: 28px;
  margin: 0 0 6px;
  letter-spacing: 0.2px;
}
.auth-sub {
  color: var(--muted);
  font-size: 15px;
  margin: 0 0 20px;
  line-height: 1.6;
}
label {
  display: block;
  font-size: 14px;
  color: var(--muted);
  margin: 16px 0 6px;
}
input[type="email"],
input[type="password"],
input[type="text"] {
  width: 100%;
  padding: 13px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--text);
  font-size: 16px;
  outline: none;
}
input:focus { border-color: var(--indigo); box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15); }
.btn-primary {
  width: 100%;
  margin-top: 24px;
  padding: 13px;
  border: 0;
  border-radius: 10px;
  background: linear-gradient(90deg, var(--indigo), var(--purple));
  color: #fff;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
}
.btn-primary:hover { filter: brightness(1.08); }
.error,
.flash {
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 15px;
  margin: 0 0 14px;
  line-height: 1.6;
}
.error {
  background: rgba(220, 38, 38, 0.07);
  border: 1px solid rgba(220, 38, 38, 0.35);
  color: var(--error);
}
.flash-success {
  background: rgba(5, 150, 105, 0.08);
  border: 1px solid rgba(5, 150, 105, 0.35);
  color: var(--ok);
}
.flash-info {
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.35);
  color: #4f46e5;
}
.auth-links {
  display: flex;
  justify-content: space-between;
  margin-top: 22px;
  font-size: 15px;
}
.auth-links a {
  color: var(--indigo);
  text-decoration: none;
}
.auth-links a:hover { text-decoration: underline; }
.resend-form { margin-top: 6px; }
.resend-form .auth-sub { margin-bottom: 0; }
.link-btn {
  background: none;
  border: none;
  color: var(--purple);
  cursor: pointer;
  padding: 0;
  font-size: 15px;
  text-decoration: underline;
}