/* ============================================================
   Apple UI Design System – Verified: 8pt Grid, SF Pro Typography,
   Material-Depth, Natural Spring Motion
   独立门面页（登录 / 注册 / 落地页）共用的居中卡片外壳。
   依赖 static/style.css 提供的设计令牌与 .btn / .card 等组件。
   ============================================================ */

body.auth-body {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-5);
  background: var(--bg);
}

.auth-card {
  width: 100%;
  max-width: 400px;
  padding: var(--sp-7) var(--sp-6) var(--sp-6);
  text-align: center;
  background: var(--glass);
  backdrop-filter: var(--material-blur);
  -webkit-backdrop-filter: var(--material-blur);
  border: 0.5px solid var(--glass-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  animation: authIn var(--dur-slow) var(--ease-spring) both;
}
.auth-card > * { animation: authFade var(--dur) var(--ease-standard) both; }
.auth-card > *:nth-child(1) { animation-delay: 40ms; }
.auth-card > *:nth-child(2) { animation-delay: 80ms; }
.auth-card > *:nth-child(3) { animation-delay: 120ms; }
.auth-card > *:nth-child(4) { animation-delay: 160ms; }
.auth-card > *:nth-child(5) { animation-delay: 200ms; }
.auth-card > *:nth-child(6) { animation-delay: 240ms; }
.auth-card > *:nth-child(n+7) { animation-delay: 280ms; }

@keyframes authIn {
  from { opacity: 0; transform: translateY(24px) scale(0.98); }
  to   { opacity: 1; transform: none; }
}
@keyframes authFade {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: none; }
}

.auth-logo {
  width: 72px;
  height: 72px;
  margin: 0 auto var(--sp-4);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 23%;
  background: var(--accent);
  color: #fff;
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.022em;
  box-shadow: 0 8px 24px var(--accent-glow);
}
.auth-logo.lg { width: 88px; height: 88px; font-size: 40px; }

.auth-title {
  font-size: var(--fs-title-2);
  font-weight: 600;
  letter-spacing: -0.022em;
  line-height: 1.2;
  color: var(--text-1);
}
.auth-sub {
  margin-top: var(--sp-1);
  font-size: var(--fs-footnote);
  font-weight: 400;
  letter-spacing: -0.011em;
  line-height: 1.5;
  color: var(--text-3);
}

.auth-flash {
  margin-top: var(--sp-4);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-sm);
  font-size: var(--fs-footnote);
  letter-spacing: -0.011em;
  line-height: 1.5;
  text-align: left;
}
.auth-flash.error {
  background: rgba(255, 59, 48, 0.1);
  color: #d70015;
  border: 0.5px solid rgba(255, 59, 48, 0.2);
}
.auth-flash.success {
  background: rgba(52, 199, 89, 0.1);
  color: #248a3d;
  border: 0.5px solid rgba(52, 199, 89, 0.2);
}
[data-theme="dark"] .auth-flash.error { color: #ff6961; }
[data-theme="dark"] .auth-flash.success { color: #30d158; }

.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  margin-top: var(--sp-5);
  text-align: left;
}
.auth-field { position: relative; }
.auth-field > input { width: 100%; padding-left: 42px; padding-right: 46px; }
.auth-ico {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-3);
  pointer-events: none;
  transition: color var(--dur) var(--ease-standard);
}
.auth-field > input:focus ~ .auth-ico { color: var(--accent); }
.auth-pw-toggle {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 0;
  border-radius: var(--radius-xs);
  background: none;
  color: var(--text-3);
  cursor: pointer;
  transition: background-color var(--dur) var(--ease-standard),
              color var(--dur) var(--ease-standard);
}
.auth-pw-toggle:hover { background: var(--card-hover); color: var(--accent); }
.auth-pw-toggle:active { transform: translateY(-50%) scale(0.96); }

.auth-hint {
  padding-left: 2px;
  margin-top: calc(var(--sp-1) * -1);
  font-size: var(--fs-caption);
  letter-spacing: -0.011em;
  color: var(--text-3);
}
.auth-submit { width: 100%; margin-top: var(--sp-2); }

.auth-footer {
  margin-top: var(--sp-5);
  font-size: var(--fs-footnote);
  letter-spacing: -0.011em;
  color: var(--text-3);
}
.auth-footer a { font-weight: 600; }

.auth-links {
  display: flex;
  gap: var(--sp-4);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--sp-5);
}
.auth-links a {
  font-size: var(--fs-footnote);
  font-weight: 400;
  letter-spacing: -0.011em;
}

.auth-feats {
  display: grid;
  gap: var(--sp-3);
  margin-top: var(--sp-5);
  text-align: left;
}
.auth-feat {
  display: flex;
  gap: var(--sp-3);
  align-items: flex-start;
  padding: var(--sp-4);
  border-radius: var(--radius-sm);
  background: var(--card);
  border: 0.5px solid var(--hairline);
}
.auth-feat-ico {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xs);
  background: var(--accent-light);
  color: var(--accent);
  font-size: var(--fs-subhead);
}
.auth-feat-t {
  font-size: var(--fs-subhead);
  font-weight: 600;
  letter-spacing: -0.011em;
  color: var(--text-1);
}
.auth-feat-d {
  margin-top: 2px;
  font-size: var(--fs-caption);
  letter-spacing: -0.011em;
  line-height: 1.5;
  color: var(--text-3);
}

@media (max-width: 440px) {
  .auth-card { padding: var(--sp-6) var(--sp-4) var(--sp-5); }
  .auth-logo { width: 64px; height: 64px; font-size: 28px; }
  .auth-title { font-size: var(--fs-title-3); }
}

@media (prefers-reduced-motion: reduce) {
  .auth-card, .auth-card > * { animation: none; }
}