.panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.authPanel {
  gap: var(--space-6);
  padding: 0;
  border: 0;
  background: transparent;
}

.heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}

/* 登录页的标题与页签重复,只保留给屏幕阅读器(aria-labelledby 仍指向它) */
.quietHeading {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}

.heading h2 {
  margin: 0;
  font-size: 16px;
}

.authPanel .heading h2 {
  font-size: 20px;
}

.heading p,
.note,
.message,
.error {
  margin: var(--space-1) 0 0;
  color: var(--text-dim);
  font-size: 12px;
  line-height: 1.6;
}

.form {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

/* 登录 / 创建账号:文字页签,当前项下划线 */
.authMode {
  display: flex;
  gap: var(--space-6);
  border-bottom: 1px solid var(--line);
}

.authMode button {
  min-height: 40px;
  margin-bottom: -1px;
  padding: 0;
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--text-dim);
  font: inherit;
  font-size: 15px;
  cursor: pointer;
}

.authMode button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.authMode button[aria-pressed="true"] {
  border-bottom-color: var(--accent);
  color: var(--text);
  font-weight: 600;
}

.authMode button:not([aria-pressed="true"]):hover {
  color: var(--text);
}

.form label {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  color: var(--text-dim);
  font-size: 13px;
}

.form input:not([type="checkbox"]) {
  min-width: 0;
  min-height: 48px;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-md);
  background: var(--surface-2);
  color: var(--text);
  font: inherit;
  font-size: 14px;
}

.form .remember input {
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  padding: 0;
  accent-color: var(--accent);
}

/* 登录页的输入框:只留一条底线,安静一些 */
.authPanel .form input:not([type="checkbox"]) {
  min-height: 44px;
  padding-inline: 0;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  border-radius: 0;
  background: transparent;
}

.form input:not([type="checkbox"]):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.authPanel .form input:not([type="checkbox"]):focus-visible {
  border-bottom-color: var(--accent);
  outline: 0;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

.form .actions {
  grid-column: 1 / -1;
}

.rules {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--text-dim);
  font-size: 12px;
  line-height: 1.6;
}

.rules li {
  display: flex;
  gap: var(--space-2);
}

.rules li[data-met='true'] {
  color: var(--text);
}

.srOnly {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}

.fieldError {
  color: var(--danger);
  font-size: 12px;
}

.authPanel .form .actions {
  justify-content: center;
}

.authPanel .form .actions > button[type="submit"] {
  flex: 1 0 100%;
  min-height: 44px;
}

.form .remember {
  grid-column: 1 / -1;
  flex-direction: row;
  align-items: center;
  gap: var(--space-2);
  min-height: 40px;
}

.error {
  color: var(--danger);
}

.message {
  color: var(--ok);
}

@media (width <= 560px) {
  .form .actions {
    grid-column: auto;
  }

}