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frontend/app/settings/page.tsx

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+"use client";
+
+import { useState, useEffect } from "react";
+import { useRouter } from "next/navigation";
+import Link from "next/link";
+import { apiChangePassword, apiMe, type User } from "@/lib/api";
+
+export default function SettingsPage() {
+  const router = useRouter();
+  const [user, setUser] = useState<User | null>(null);
+  const [oldPassword, setOldPassword] = useState("");
+  const [newPassword, setNewPassword] = useState("");
+  const [confirmPassword, setConfirmPassword] = useState("");
+  const [submitting, setSubmitting] = useState(false);
+  const [error, setError] = useState("");
+  const [success, setSuccess] = useState(false);
+
+  useEffect(() => {
+    apiMe()
+      .then((res) => {
+        if (!res.user) {
+          router.push("/login");
+          return;
+        }
+        setUser(res.user);
+      })
+      .catch(() => router.push("/login"));
+  }, [router]);
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault();
+    setError("");
+
+    if (newPassword.length < 6) {
+      setError("新密码至少 6 位");
+      return;
+    }
+    if (newPassword !== confirmPassword) {
+      setError("两次输入的新密码不一致");
+      return;
+    }
+
+    setSubmitting(true);
+    try {
+      const res = await apiChangePassword(oldPassword, newPassword);
+      if (res.message) {
+        setSuccess(true);
+        setTimeout(() => router.push("/login"), 1500);
+      } else {
+        setError(res.error || "修改失败");
+      }
+    } catch (e) {
+      setError("网络错误，请重试");
+    } finally {
+      setSubmitting(false);
+    }
+  };
+
+  if (!user) {
+    return <p style={{ color: "var(--text-secondary)" }}>加载中...</p>;
+  }
+
+  return (
+    <div className="max-w-md mx-auto">
+      <nav className="text-sm mb-4" style={{ color: "var(--text-secondary)" }}>
+        <Link href="/" className="hover:underline">首页</Link>
+        <span className="mx-2">/</span>
+        <span>账号设置</span>
+      </nav>
+
+      <h1 className="text-2xl font-bold mb-6">账号设置</h1>
+
+      <div className="p-4 rounded-lg mb-6" style={{ background: "var(--bg-secondary)" }}>
+        <div className="text-sm" style={{ color: "var(--text-secondary)" }}>当前账号</div>
+        <div className="font-medium mt-1" style={{ color: "var(--text)" }}>{user.nickname}（{user.username}）</div>
+      </div>
+
+      <h2 className="text-lg font-semibold mb-4">修改密码</h2>
+
+      {success && (
+        <div className="p-3 rounded-lg mb-4 text-sm" style={{ background: "var(--success-bg, #dcfce7)", color: "#166534" }}>
+          密码修改成功，正在跳转登录页...
+        </div>
+      )}
+
+      {error && (
+        <div className="p-3 rounded-lg mb-4 text-sm" style={{ background: "var(--error-bg, #fee2e2)", color: "#991b1b" }}>
+          {error}
+        </div>
+      )}
+
+      <form onSubmit={handleSubmit} className="space-y-4">
+        <div>
+          <label className="block text-sm font-medium mb-1" style={{ color: "var(--text)" }}>当前密码</label>
+          <input
+            type="password"
+            value={oldPassword}
+            onChange={(e) => setOldPassword(e.target.value)}
+            required
+            className="w-full p-3 rounded-lg border"
+            style={{ borderColor: "var(--border)", background: "var(--bg)", color: "var(--text)" }}
+          />
+        </div>
+        <div>
+          <label className="block text-sm font-medium mb-1" style={{ color: "var(--text)" }}>新密码</label>
+          <input
+            type="password"
+            value={newPassword}
+            onChange={(e) => setNewPassword(e.target.value)}
+            required
+            minLength={6}
+            className="w-full p-3 rounded-lg border"
+            style={{ borderColor: "var(--border)", background: "var(--bg)", color: "var(--text)" }}
+          />
+        </div>
+        <div>
+          <label className="block text-sm font-medium mb-1" style={{ color: "var(--text)" }}>确认新密码</label>
+          <input
+            type="password"
+            value={confirmPassword}
+            onChange={(e) => setConfirmPassword(e.target.value)}
+            required
+            minLength={6}
+            className="w-full p-3 rounded-lg border"
+            style={{ borderColor: "var(--border)", background: "var(--bg)", color: "var(--text)" }}
+          />
+        </div>
+        <button
+          type="submit"
+          disabled={submitting || success}
+          className="w-full py-3 rounded-lg text-white font-medium disabled:opacity-50"
+          style={{ background: "var(--primary)" }}
+        >
+          {submitting ? "提交中..." : "修改密码"}
+        </button>
+      </form>
+    </div>
+  );
+}