prepare("SELECT * FROM admins WHERE username = ?");
$stmt->execute([$username]);
$admin = $stmt->fetch();
if ($admin && password_verify($password, $admin['password'])) {
$_SESSION['admin_id'] = $admin['id'];
$_SESSION['admin_username'] = $admin['username'];
// 把他自己选的界面主题一起带进会话（空 = 用默认主题）
$_SESSION['admin_theme'] = isset($admin['theme']) ? (string)$admin['theme'] : '';
header('Location: index.php');
exit;
} else {
$error = '用户名或密码错误';
}
}
}
?>
>
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