/* ===================== 登录 / 注册页（auth 页面）样式 ===================== */

.auth-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 92px 22px 92px;
}

/* 顶部信息条：署名 + 实时时钟 */
.top-bar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 26px;
}
.brand-tag {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 8px 15px 8px 11px;
  border-radius: 999px;
  font-size: 13.5px; font-weight: 550; color: var(--text-2);
  background: var(--glass-bg-subtle);
  border: 1px solid var(--glass-border);
  -webkit-backdrop-filter: blur(16px) saturate(170%);
  backdrop-filter: blur(16px) saturate(170%);
  box-shadow: var(--shadow-sm), inset 0 1px 0 var(--glass-inset);
}
.brand-tag .logo-mark {
  width: 22px; height: 22px; border-radius: 7px;
  background: linear-gradient(140deg, var(--accent), var(--violet) 60%, var(--pink));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.55), 0 4px 10px rgba(10, 132, 255, 0.3);
}

.clock-chip {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 8px 15px; border-radius: 999px;
  font-variant-numeric: tabular-nums; font-family: var(--font-mono); font-size: 13.5px;
  color: var(--text-2);
  background: var(--glass-bg-subtle);
  border: 1px solid var(--glass-border);
  -webkit-backdrop-filter: blur(16px) saturate(170%);
  backdrop-filter: blur(16px) saturate(170%);
  box-shadow: var(--shadow-sm), inset 0 1px 0 var(--glass-inset);
}
.clock-chip .date { color: var(--text-3); font-size: 12.5px; }

/* 玻璃卡片容器 */
.auth-card {
  width: min(460px, 100%);
  padding: 40px 38px 34px;
  border-radius: var(--radius-xl);
  animation: cardIn 0.7s var(--ease-spring) both;
}
@keyframes cardIn { from { opacity: 0; transform: translateY(26px) scale(0.97); } to { opacity: 1; transform: none; } }

.auth-card-head { margin-bottom: 26px; }
.auth-card-head .eyebrow {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 12px;
}
.auth-card-head p.sub { margin-top: 8px; font-size: 14.5px; color: var(--text-2); }

.auth-form .row-between { margin: 4px 0 24px; }
.link-soft { font-size: 13.5px; color: var(--accent); font-weight: 500; }
.link-soft:hover { text-decoration: underline; }

.auth-foot { margin-top: 22px; text-align: center; font-size: 14px; color: var(--text-2); }

/* 分割线 */
.divider { display: flex; align-items: center; gap: 12px; margin: 22px 0; color: var(--text-3); font-size: 12.5px; }
.divider::before, .divider::after { content: ""; height: 1px; flex: 1; background: linear-gradient(90deg, transparent, var(--glass-stroke), transparent); }

/* 演示账号提示（.demo-hint / .service-warn 通用样式在 glass.css 中） */
.demo-hint { margin-top: 18px; }

/* 密码强度条 */
.strength { display: flex; gap: 5px; margin-top: 9px; }
.strength i { height: 4px; flex: 1; border-radius: 999px; background: rgba(130, 140, 165, 0.26); transition: background 0.3s var(--ease-out); }
.strength[data-level="1"] i:nth-child(1) { background: var(--danger); }
.strength[data-level="2"] i:nth-child(-n+2) { background: var(--warning); }
.strength[data-level="3"] i:nth-child(-n+3) { background: #f7c948; }
.strength[data-level="4"] i { background: var(--success); }

/* 底部版权：纯装饰，必须让出点击（否则会挡住卡片最下方的「立即注册」按钮） */
.foot-note {
  position: fixed; bottom: 16px; left: 0; right: 0; text-align: center;
  font-size: 12.5px; color: var(--text-3); z-index: 1;
  pointer-events: none;
}

/* 主题切换按钮（右上角时钟旁） */
.theme-toggle {
  width: 38px; height: 38px; border-radius: 50%;
  display: grid; place-items: center; cursor: pointer;
  background: var(--glass-bg-subtle); border: 1px solid var(--glass-border);
  -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px);
  box-shadow: var(--shadow-sm), inset 0 1px 0 var(--glass-inset);
  color: var(--text-2); transition: transform 0.3s var(--ease-spring), color 0.2s;
}
.theme-toggle:hover { transform: rotate(-18deg) scale(1.06); color: var(--accent); }

@media (max-width: 560px) {
  .auth-shell { padding: 88px 16px 56px; }
  .auth-card { padding: 30px 22px 26px; }
  .top-bar { padding: 14px 16px; }
  .clock-chip .date { display: none; }
}


/* 注册页：年级 / 专业 / 班号两列布局 */
.field-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 14px; }
@media (max-width: 620px) { .field-row { grid-template-columns: minmax(0, 1fr); } }
.auth-form select.input { appearance: none; cursor: pointer; }
.class-preview {
  padding: 10px 12px; border-radius: 10px; font-size: 13px; line-height: 1.5;
  color: var(--ink-3); background: var(--surface-3); border: 1px dashed var(--line-strong);
}
.class-preview.ready { color: #2f6fd0; border-style: solid; }