feat(auth): 添加登录页与演示认证逻辑

clinical-web/src/styles/index.css

@@ -365,3 +365,160 @@ a {
     padding: 16px;
   }
 }
+
+/* 原型登录页 */
+.login-page {
+  position: fixed;
+  inset: 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: var(--login-gradient);
+}
+
+.login-card {
+  width: 380px;
+  padding: 38px 36px;
+  background: #fff;
+  border-radius: 14px;
+  box-shadow: var(--sh-login);
+}
+
+.login-brand {
+  display: flex;
+  gap: 12px;
+  align-items: center;
+  justify-content: center;
+  margin-bottom: 8px;
+}
+
+.login-brand-icon {
+  display: grid;
+  width: 46px;
+  height: 46px;
+  place-items: center;
+  border-radius: 12px;
+  background: linear-gradient(135deg, var(--brand), #18a0c0);
+}
+
+.login-brand h1 {
+  margin: 0;
+  color: var(--ink);
+  font-size: 22px;
+  letter-spacing: 1px;
+}
+
+.login-brand p {
+  margin: 2px 0 0;
+  color: #8aa7b3;
+  font-size: 11px;
+  letter-spacing: 2px;
+}
+
+.login-subtitle {
+  margin: 0 0 26px;
+  color: var(--mut);
+  font-size: 12px;
+  text-align: center;
+}
+
+.login-field {
+  margin-bottom: 14px;
+}
+
+.login-field label {
+  display: block;
+  margin-bottom: 6px;
+  color: var(--mut);
+  font-size: 12px;
+}
+
+.login-field input {
+  width: 100%;
+  padding: 7px 10px;
+  color: var(--ink);
+  font-size: 13px;
+  background: #fff;
+  border: 1px solid var(--line);
+  border-radius: 6px;
+  outline: none;
+}
+
+.login-field input:focus {
+  border-color: var(--brand);
+}
+
+.login-captcha-row {
+  display: flex;
+  gap: 8px;
+  align-items: center;
+}
+
+.login-captcha-row input {
+  flex: 1;
+}
+
+.login-captcha-image {
+  flex-shrink: 0;
+  padding: 8px 14px;
+  color: #5c7d8a;
+  font-size: 13px;
+  font-style: italic;
+  font-weight: 700;
+  letter-spacing: 6px;
+  user-select: none;
+  background: linear-gradient(120deg, #dfeef3, #c8dfe8);
+  border-radius: 6px;
+}
+
+.login-error {
+  margin: -4px 0 10px;
+  color: var(--err);
+  font-size: 12px;
+}
+
+.login-submit {
+  width: 100%;
+  margin-top: 10px;
+  padding: 10px;
+  color: #fff;
+  font-size: 13px;
+  font-weight: 700;
+  background: var(--brand);
+  border-radius: 7px;
+}
+
+.login-submit:hover {
+  background: var(--brand-d);
+}
+
+.login-tip {
+  margin: 16px 0 0;
+  padding: 8px;
+  color: var(--mut);
+  font-size: 12px;
+  text-align: center;
+  background: var(--brand-l);
+  border-radius: 8px;
+}
+
+.login-footer {
+  position: absolute;
+  bottom: 18px;
+  width: 100%;
+  margin: 0;
+  color: rgb(255 255 255 / 55%);
+  font-size: 12px;
+  text-align: center;
+}
+
+@media (max-width: 520px) {
+  body {
+    min-width: 0;
+  }
+
+  .login-card {
+    width: calc(100% - 32px);
+    padding: 32px 24px;
+  }
+}